forked from toolshed/abra
decentral1se
1723025fbf
We were running behind and there were quite some deprecations to update. This was mostly in the upstream copy/pasta package but seems quite minimal.
3288 lines
95 KiB
Go
3288 lines
95 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Transport code.
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package http2
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"context"
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"crypto/rand"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"io/fs"
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"log"
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"math"
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"math/bits"
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mathrand "math/rand"
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"net"
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"net/http"
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"net/http/httptrace"
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"net/textproto"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"golang.org/x/net/http/httpguts"
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"golang.org/x/net/http2/hpack"
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"golang.org/x/net/idna"
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"golang.org/x/net/internal/httpcommon"
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)
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const (
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// transportDefaultConnFlow is how many connection-level flow control
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// tokens we give the server at start-up, past the default 64k.
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transportDefaultConnFlow = 1 << 30
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// transportDefaultStreamFlow is how many stream-level flow
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// control tokens we announce to the peer, and how many bytes
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// we buffer per stream.
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transportDefaultStreamFlow = 4 << 20
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defaultUserAgent = "Go-http-client/2.0"
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// initialMaxConcurrentStreams is a connections maxConcurrentStreams until
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// it's received servers initial SETTINGS frame, which corresponds with the
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// spec's minimum recommended value.
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initialMaxConcurrentStreams = 100
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// defaultMaxConcurrentStreams is a connections default maxConcurrentStreams
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// if the server doesn't include one in its initial SETTINGS frame.
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defaultMaxConcurrentStreams = 1000
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)
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// Transport is an HTTP/2 Transport.
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//
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// A Transport internally caches connections to servers. It is safe
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// for concurrent use by multiple goroutines.
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type Transport struct {
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// DialTLSContext specifies an optional dial function with context for
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// creating TLS connections for requests.
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//
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// If DialTLSContext and DialTLS is nil, tls.Dial is used.
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//
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// If the returned net.Conn has a ConnectionState method like tls.Conn,
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// it will be used to set http.Response.TLS.
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DialTLSContext func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error)
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// DialTLS specifies an optional dial function for creating
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// TLS connections for requests.
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//
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// If DialTLSContext and DialTLS is nil, tls.Dial is used.
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//
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// Deprecated: Use DialTLSContext instead, which allows the transport
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// to cancel dials as soon as they are no longer needed.
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// If both are set, DialTLSContext takes priority.
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DialTLS func(network, addr string, cfg *tls.Config) (net.Conn, error)
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// TLSClientConfig specifies the TLS configuration to use with
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// tls.Client. If nil, the default configuration is used.
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TLSClientConfig *tls.Config
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// ConnPool optionally specifies an alternate connection pool to use.
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// If nil, the default is used.
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ConnPool ClientConnPool
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// DisableCompression, if true, prevents the Transport from
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// requesting compression with an "Accept-Encoding: gzip"
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// request header when the Request contains no existing
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// Accept-Encoding value. If the Transport requests gzip on
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// its own and gets a gzipped response, it's transparently
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// decoded in the Response.Body. However, if the user
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// explicitly requested gzip it is not automatically
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// uncompressed.
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DisableCompression bool
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// AllowHTTP, if true, permits HTTP/2 requests using the insecure,
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// plain-text "http" scheme. Note that this does not enable h2c support.
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AllowHTTP bool
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// MaxHeaderListSize is the http2 SETTINGS_MAX_HEADER_LIST_SIZE to
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// send in the initial settings frame. It is how many bytes
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// of response headers are allowed. Unlike the http2 spec, zero here
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// means to use a default limit (currently 10MB). If you actually
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// want to advertise an unlimited value to the peer, Transport
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// interprets the highest possible value here (0xffffffff or 1<<32-1)
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// to mean no limit.
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MaxHeaderListSize uint32
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// MaxReadFrameSize is the http2 SETTINGS_MAX_FRAME_SIZE to send in the
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// initial settings frame. It is the size in bytes of the largest frame
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// payload that the sender is willing to receive. If 0, no setting is
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// sent, and the value is provided by the peer, which should be 16384
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// according to the spec:
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// https://datatracker.ietf.org/doc/html/rfc7540#section-6.5.2.
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// Values are bounded in the range 16k to 16M.
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MaxReadFrameSize uint32
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// MaxDecoderHeaderTableSize optionally specifies the http2
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// SETTINGS_HEADER_TABLE_SIZE to send in the initial settings frame. It
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// informs the remote endpoint of the maximum size of the header compression
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// table used to decode header blocks, in octets. If zero, the default value
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// of 4096 is used.
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MaxDecoderHeaderTableSize uint32
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// MaxEncoderHeaderTableSize optionally specifies an upper limit for the
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// header compression table used for encoding request headers. Received
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// SETTINGS_HEADER_TABLE_SIZE settings are capped at this limit. If zero,
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// the default value of 4096 is used.
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MaxEncoderHeaderTableSize uint32
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// StrictMaxConcurrentStreams controls whether the server's
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// SETTINGS_MAX_CONCURRENT_STREAMS should be respected
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// globally. If false, new TCP connections are created to the
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// server as needed to keep each under the per-connection
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// SETTINGS_MAX_CONCURRENT_STREAMS limit. If true, the
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// server's SETTINGS_MAX_CONCURRENT_STREAMS is interpreted as
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// a global limit and callers of RoundTrip block when needed,
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// waiting for their turn.
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StrictMaxConcurrentStreams bool
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// IdleConnTimeout is the maximum amount of time an idle
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// (keep-alive) connection will remain idle before closing
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// itself.
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// Zero means no limit.
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IdleConnTimeout time.Duration
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// ReadIdleTimeout is the timeout after which a health check using ping
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// frame will be carried out if no frame is received on the connection.
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// Note that a ping response will is considered a received frame, so if
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// there is no other traffic on the connection, the health check will
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// be performed every ReadIdleTimeout interval.
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// If zero, no health check is performed.
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ReadIdleTimeout time.Duration
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// PingTimeout is the timeout after which the connection will be closed
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// if a response to Ping is not received.
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// Defaults to 15s.
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PingTimeout time.Duration
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// WriteByteTimeout is the timeout after which the connection will be
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// closed no data can be written to it. The timeout begins when data is
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// available to write, and is extended whenever any bytes are written.
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WriteByteTimeout time.Duration
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// CountError, if non-nil, is called on HTTP/2 transport errors.
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// It's intended to increment a metric for monitoring, such
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// as an expvar or Prometheus metric.
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// The errType consists of only ASCII word characters.
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CountError func(errType string)
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// t1, if non-nil, is the standard library Transport using
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// this transport. Its settings are used (but not its
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// RoundTrip method, etc).
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t1 *http.Transport
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connPoolOnce sync.Once
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connPoolOrDef ClientConnPool // non-nil version of ConnPool
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*transportTestHooks
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}
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// Hook points used for testing.
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// Outside of tests, t.transportTestHooks is nil and these all have minimal implementations.
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// Inside tests, see the testSyncHooks function docs.
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type transportTestHooks struct {
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newclientconn func(*ClientConn)
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group synctestGroupInterface
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}
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func (t *Transport) markNewGoroutine() {
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if t != nil && t.transportTestHooks != nil {
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t.transportTestHooks.group.Join()
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}
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}
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func (t *Transport) now() time.Time {
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if t != nil && t.transportTestHooks != nil {
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return t.transportTestHooks.group.Now()
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}
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return time.Now()
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}
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func (t *Transport) timeSince(when time.Time) time.Duration {
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if t != nil && t.transportTestHooks != nil {
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return t.now().Sub(when)
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}
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return time.Since(when)
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}
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// newTimer creates a new time.Timer, or a synthetic timer in tests.
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func (t *Transport) newTimer(d time.Duration) timer {
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if t.transportTestHooks != nil {
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return t.transportTestHooks.group.NewTimer(d)
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}
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return timeTimer{time.NewTimer(d)}
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}
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// afterFunc creates a new time.AfterFunc timer, or a synthetic timer in tests.
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func (t *Transport) afterFunc(d time.Duration, f func()) timer {
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if t.transportTestHooks != nil {
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return t.transportTestHooks.group.AfterFunc(d, f)
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}
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return timeTimer{time.AfterFunc(d, f)}
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}
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func (t *Transport) contextWithTimeout(ctx context.Context, d time.Duration) (context.Context, context.CancelFunc) {
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if t.transportTestHooks != nil {
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return t.transportTestHooks.group.ContextWithTimeout(ctx, d)
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}
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return context.WithTimeout(ctx, d)
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}
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func (t *Transport) maxHeaderListSize() uint32 {
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n := int64(t.MaxHeaderListSize)
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if t.t1 != nil && t.t1.MaxResponseHeaderBytes != 0 {
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n = t.t1.MaxResponseHeaderBytes
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if n > 0 {
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n = adjustHTTP1MaxHeaderSize(n)
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}
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}
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if n <= 0 {
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return 10 << 20
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}
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if n >= 0xffffffff {
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return 0
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}
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return uint32(n)
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}
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func (t *Transport) disableCompression() bool {
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return t.DisableCompression || (t.t1 != nil && t.t1.DisableCompression)
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}
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// ConfigureTransport configures a net/http HTTP/1 Transport to use HTTP/2.
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// It returns an error if t1 has already been HTTP/2-enabled.
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//
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// Use ConfigureTransports instead to configure the HTTP/2 Transport.
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func ConfigureTransport(t1 *http.Transport) error {
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_, err := ConfigureTransports(t1)
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return err
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}
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// ConfigureTransports configures a net/http HTTP/1 Transport to use HTTP/2.
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// It returns a new HTTP/2 Transport for further configuration.
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// It returns an error if t1 has already been HTTP/2-enabled.
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func ConfigureTransports(t1 *http.Transport) (*Transport, error) {
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return configureTransports(t1)
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}
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func configureTransports(t1 *http.Transport) (*Transport, error) {
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connPool := new(clientConnPool)
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t2 := &Transport{
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ConnPool: noDialClientConnPool{connPool},
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t1: t1,
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}
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connPool.t = t2
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if err := registerHTTPSProtocol(t1, noDialH2RoundTripper{t2}); err != nil {
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return nil, err
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}
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if t1.TLSClientConfig == nil {
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t1.TLSClientConfig = new(tls.Config)
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}
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if !strSliceContains(t1.TLSClientConfig.NextProtos, "h2") {
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t1.TLSClientConfig.NextProtos = append([]string{"h2"}, t1.TLSClientConfig.NextProtos...)
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}
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if !strSliceContains(t1.TLSClientConfig.NextProtos, "http/1.1") {
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t1.TLSClientConfig.NextProtos = append(t1.TLSClientConfig.NextProtos, "http/1.1")
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}
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upgradeFn := func(scheme, authority string, c net.Conn) http.RoundTripper {
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addr := authorityAddr(scheme, authority)
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if used, err := connPool.addConnIfNeeded(addr, t2, c); err != nil {
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go c.Close()
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return erringRoundTripper{err}
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} else if !used {
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// Turns out we don't need this c.
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// For example, two goroutines made requests to the same host
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// at the same time, both kicking off TCP dials. (since protocol
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// was unknown)
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go c.Close()
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}
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if scheme == "http" {
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return (*unencryptedTransport)(t2)
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}
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return t2
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}
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if t1.TLSNextProto == nil {
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t1.TLSNextProto = make(map[string]func(string, *tls.Conn) http.RoundTripper)
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}
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t1.TLSNextProto[NextProtoTLS] = func(authority string, c *tls.Conn) http.RoundTripper {
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return upgradeFn("https", authority, c)
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}
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// The "unencrypted_http2" TLSNextProto key is used to pass off non-TLS HTTP/2 conns.
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t1.TLSNextProto[nextProtoUnencryptedHTTP2] = func(authority string, c *tls.Conn) http.RoundTripper {
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nc, err := unencryptedNetConnFromTLSConn(c)
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if err != nil {
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go c.Close()
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return erringRoundTripper{err}
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}
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return upgradeFn("http", authority, nc)
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}
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return t2, nil
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}
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// unencryptedTransport is a Transport with a RoundTrip method that
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// always permits http:// URLs.
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type unencryptedTransport Transport
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func (t *unencryptedTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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return (*Transport)(t).RoundTripOpt(req, RoundTripOpt{allowHTTP: true})
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}
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func (t *Transport) connPool() ClientConnPool {
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t.connPoolOnce.Do(t.initConnPool)
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return t.connPoolOrDef
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}
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func (t *Transport) initConnPool() {
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if t.ConnPool != nil {
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t.connPoolOrDef = t.ConnPool
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} else {
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t.connPoolOrDef = &clientConnPool{t: t}
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}
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}
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// ClientConn is the state of a single HTTP/2 client connection to an
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// HTTP/2 server.
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type ClientConn struct {
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t *Transport
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tconn net.Conn // usually *tls.Conn, except specialized impls
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tlsState *tls.ConnectionState // nil only for specialized impls
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atomicReused uint32 // whether conn is being reused; atomic
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singleUse bool // whether being used for a single http.Request
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getConnCalled bool // used by clientConnPool
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// readLoop goroutine fields:
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readerDone chan struct{} // closed on error
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readerErr error // set before readerDone is closed
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idleTimeout time.Duration // or 0 for never
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idleTimer timer
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mu sync.Mutex // guards following
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cond *sync.Cond // hold mu; broadcast on flow/closed changes
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flow outflow // our conn-level flow control quota (cs.outflow is per stream)
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inflow inflow // peer's conn-level flow control
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doNotReuse bool // whether conn is marked to not be reused for any future requests
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closing bool
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closed bool
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closedOnIdle bool // true if conn was closed for idleness
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seenSettings bool // true if we've seen a settings frame, false otherwise
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seenSettingsChan chan struct{} // closed when seenSettings is true or frame reading fails
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wantSettingsAck bool // we sent a SETTINGS frame and haven't heard back
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goAway *GoAwayFrame // if non-nil, the GoAwayFrame we received
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goAwayDebug string // goAway frame's debug data, retained as a string
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streams map[uint32]*clientStream // client-initiated
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streamsReserved int // incr by ReserveNewRequest; decr on RoundTrip
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nextStreamID uint32
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pendingRequests int // requests blocked and waiting to be sent because len(streams) == maxConcurrentStreams
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pings map[[8]byte]chan struct{} // in flight ping data to notification channel
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br *bufio.Reader
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lastActive time.Time
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lastIdle time.Time // time last idle
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// Settings from peer: (also guarded by wmu)
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maxFrameSize uint32
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maxConcurrentStreams uint32
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peerMaxHeaderListSize uint64
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peerMaxHeaderTableSize uint32
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initialWindowSize uint32
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initialStreamRecvWindowSize int32
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readIdleTimeout time.Duration
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pingTimeout time.Duration
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extendedConnectAllowed bool
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// rstStreamPingsBlocked works around an unfortunate gRPC behavior.
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// gRPC strictly limits the number of PING frames that it will receive.
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// The default is two pings per two hours, but the limit resets every time
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// the gRPC endpoint sends a HEADERS or DATA frame. See golang/go#70575.
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//
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// rstStreamPingsBlocked is set after receiving a response to a PING frame
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// bundled with an RST_STREAM (see pendingResets below), and cleared after
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// receiving a HEADERS or DATA frame.
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rstStreamPingsBlocked bool
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// pendingResets is the number of RST_STREAM frames we have sent to the peer,
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// without confirming that the peer has received them. When we send a RST_STREAM,
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// we bundle it with a PING frame, unless a PING is already in flight. We count
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// the reset stream against the connection's concurrency limit until we get
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// a PING response. This limits the number of requests we'll try to send to a
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// completely unresponsive connection.
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pendingResets int
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// reqHeaderMu is a 1-element semaphore channel controlling access to sending new requests.
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// Write to reqHeaderMu to lock it, read from it to unlock.
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// Lock reqmu BEFORE mu or wmu.
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reqHeaderMu chan struct{}
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// wmu is held while writing.
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// Acquire BEFORE mu when holding both, to avoid blocking mu on network writes.
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// Only acquire both at the same time when changing peer settings.
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wmu sync.Mutex
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bw *bufio.Writer
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fr *Framer
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werr error // first write error that has occurred
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hbuf bytes.Buffer // HPACK encoder writes into this
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henc *hpack.Encoder
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}
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// clientStream is the state for a single HTTP/2 stream. One of these
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// is created for each Transport.RoundTrip call.
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type clientStream struct {
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cc *ClientConn
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// Fields of Request that we may access even after the response body is closed.
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ctx context.Context
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reqCancel <-chan struct{}
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trace *httptrace.ClientTrace // or nil
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ID uint32
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bufPipe pipe // buffered pipe with the flow-controlled response payload
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requestedGzip bool
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isHead bool
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abortOnce sync.Once
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abort chan struct{} // closed to signal stream should end immediately
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abortErr error // set if abort is closed
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peerClosed chan struct{} // closed when the peer sends an END_STREAM flag
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donec chan struct{} // closed after the stream is in the closed state
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on100 chan struct{} // buffered; written to if a 100 is received
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respHeaderRecv chan struct{} // closed when headers are received
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res *http.Response // set if respHeaderRecv is closed
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flow outflow // guarded by cc.mu
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inflow inflow // guarded by cc.mu
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bytesRemain int64 // -1 means unknown; owned by transportResponseBody.Read
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readErr error // sticky read error; owned by transportResponseBody.Read
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reqBody io.ReadCloser
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reqBodyContentLength int64 // -1 means unknown
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reqBodyClosed chan struct{} // guarded by cc.mu; non-nil on Close, closed when done
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// owned by writeRequest:
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sentEndStream bool // sent an END_STREAM flag to the peer
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sentHeaders bool
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// owned by clientConnReadLoop:
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firstByte bool // got the first response byte
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pastHeaders bool // got first MetaHeadersFrame (actual headers)
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pastTrailers bool // got optional second MetaHeadersFrame (trailers)
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readClosed bool // peer sent an END_STREAM flag
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readAborted bool // read loop reset the stream
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totalHeaderSize int64 // total size of 1xx headers seen
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trailer http.Header // accumulated trailers
|
|
resTrailer *http.Header // client's Response.Trailer
|
|
}
|
|
|
|
var got1xxFuncForTests func(int, textproto.MIMEHeader) error
|
|
|
|
// get1xxTraceFunc returns the value of request's httptrace.ClientTrace.Got1xxResponse func,
|
|
// if any. It returns nil if not set or if the Go version is too old.
|
|
func (cs *clientStream) get1xxTraceFunc() func(int, textproto.MIMEHeader) error {
|
|
if fn := got1xxFuncForTests; fn != nil {
|
|
return fn
|
|
}
|
|
return traceGot1xxResponseFunc(cs.trace)
|
|
}
|
|
|
|
func (cs *clientStream) abortStream(err error) {
|
|
cs.cc.mu.Lock()
|
|
defer cs.cc.mu.Unlock()
|
|
cs.abortStreamLocked(err)
|
|
}
|
|
|
|
func (cs *clientStream) abortStreamLocked(err error) {
|
|
cs.abortOnce.Do(func() {
|
|
cs.abortErr = err
|
|
close(cs.abort)
|
|
})
|
|
if cs.reqBody != nil {
|
|
cs.closeReqBodyLocked()
|
|
}
|
|
// TODO(dneil): Clean up tests where cs.cc.cond is nil.
|
|
if cs.cc.cond != nil {
|
|
// Wake up writeRequestBody if it is waiting on flow control.
|
|
cs.cc.cond.Broadcast()
|
|
}
|
|
}
|
|
|
|
func (cs *clientStream) abortRequestBodyWrite() {
|
|
cc := cs.cc
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
if cs.reqBody != nil && cs.reqBodyClosed == nil {
|
|
cs.closeReqBodyLocked()
|
|
cc.cond.Broadcast()
|
|
}
|
|
}
|
|
|
|
func (cs *clientStream) closeReqBodyLocked() {
|
|
if cs.reqBodyClosed != nil {
|
|
return
|
|
}
|
|
cs.reqBodyClosed = make(chan struct{})
|
|
reqBodyClosed := cs.reqBodyClosed
|
|
go func() {
|
|
cs.cc.t.markNewGoroutine()
|
|
cs.reqBody.Close()
|
|
close(reqBodyClosed)
|
|
}()
|
|
}
|
|
|
|
type stickyErrWriter struct {
|
|
group synctestGroupInterface
|
|
conn net.Conn
|
|
timeout time.Duration
|
|
err *error
|
|
}
|
|
|
|
func (sew stickyErrWriter) Write(p []byte) (n int, err error) {
|
|
if *sew.err != nil {
|
|
return 0, *sew.err
|
|
}
|
|
n, err = writeWithByteTimeout(sew.group, sew.conn, sew.timeout, p)
|
|
*sew.err = err
|
|
return n, err
|
|
}
|
|
|
|
// noCachedConnError is the concrete type of ErrNoCachedConn, which
|
|
// needs to be detected by net/http regardless of whether it's its
|
|
// bundled version (in h2_bundle.go with a rewritten type name) or
|
|
// from a user's x/net/http2. As such, as it has a unique method name
|
|
// (IsHTTP2NoCachedConnError) that net/http sniffs for via func
|
|
// isNoCachedConnError.
|
|
type noCachedConnError struct{}
|
|
|
|
func (noCachedConnError) IsHTTP2NoCachedConnError() {}
|
|
func (noCachedConnError) Error() string { return "http2: no cached connection was available" }
|
|
|
|
// isNoCachedConnError reports whether err is of type noCachedConnError
|
|
// or its equivalent renamed type in net/http2's h2_bundle.go. Both types
|
|
// may coexist in the same running program.
|
|
func isNoCachedConnError(err error) bool {
|
|
_, ok := err.(interface{ IsHTTP2NoCachedConnError() })
|
|
return ok
|
|
}
|
|
|
|
var ErrNoCachedConn error = noCachedConnError{}
|
|
|
|
// RoundTripOpt are options for the Transport.RoundTripOpt method.
|
|
type RoundTripOpt struct {
|
|
// OnlyCachedConn controls whether RoundTripOpt may
|
|
// create a new TCP connection. If set true and
|
|
// no cached connection is available, RoundTripOpt
|
|
// will return ErrNoCachedConn.
|
|
OnlyCachedConn bool
|
|
|
|
allowHTTP bool // allow http:// URLs
|
|
}
|
|
|
|
func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
return t.RoundTripOpt(req, RoundTripOpt{})
|
|
}
|
|
|
|
// authorityAddr returns a given authority (a host/IP, or host:port / ip:port)
|
|
// and returns a host:port. The port 443 is added if needed.
|
|
func authorityAddr(scheme string, authority string) (addr string) {
|
|
host, port, err := net.SplitHostPort(authority)
|
|
if err != nil { // authority didn't have a port
|
|
host = authority
|
|
port = ""
|
|
}
|
|
if port == "" { // authority's port was empty
|
|
port = "443"
|
|
if scheme == "http" {
|
|
port = "80"
|
|
}
|
|
}
|
|
if a, err := idna.ToASCII(host); err == nil {
|
|
host = a
|
|
}
|
|
// IPv6 address literal, without a port:
|
|
if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
|
|
return host + ":" + port
|
|
}
|
|
return net.JoinHostPort(host, port)
|
|
}
|
|
|
|
// RoundTripOpt is like RoundTrip, but takes options.
|
|
func (t *Transport) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.Response, error) {
|
|
switch req.URL.Scheme {
|
|
case "https":
|
|
// Always okay.
|
|
case "http":
|
|
if !t.AllowHTTP && !opt.allowHTTP {
|
|
return nil, errors.New("http2: unencrypted HTTP/2 not enabled")
|
|
}
|
|
default:
|
|
return nil, errors.New("http2: unsupported scheme")
|
|
}
|
|
|
|
addr := authorityAddr(req.URL.Scheme, req.URL.Host)
|
|
for retry := 0; ; retry++ {
|
|
cc, err := t.connPool().GetClientConn(req, addr)
|
|
if err != nil {
|
|
t.vlogf("http2: Transport failed to get client conn for %s: %v", addr, err)
|
|
return nil, err
|
|
}
|
|
reused := !atomic.CompareAndSwapUint32(&cc.atomicReused, 0, 1)
|
|
traceGotConn(req, cc, reused)
|
|
res, err := cc.RoundTrip(req)
|
|
if err != nil && retry <= 6 {
|
|
roundTripErr := err
|
|
if req, err = shouldRetryRequest(req, err); err == nil {
|
|
// After the first retry, do exponential backoff with 10% jitter.
|
|
if retry == 0 {
|
|
t.vlogf("RoundTrip retrying after failure: %v", roundTripErr)
|
|
continue
|
|
}
|
|
backoff := float64(uint(1) << (uint(retry) - 1))
|
|
backoff += backoff * (0.1 * mathrand.Float64())
|
|
d := time.Second * time.Duration(backoff)
|
|
tm := t.newTimer(d)
|
|
select {
|
|
case <-tm.C():
|
|
t.vlogf("RoundTrip retrying after failure: %v", roundTripErr)
|
|
continue
|
|
case <-req.Context().Done():
|
|
tm.Stop()
|
|
err = req.Context().Err()
|
|
}
|
|
}
|
|
}
|
|
if err == errClientConnNotEstablished {
|
|
// This ClientConn was created recently,
|
|
// this is the first request to use it,
|
|
// and the connection is closed and not usable.
|
|
//
|
|
// In this state, cc.idleTimer will remove the conn from the pool
|
|
// when it fires. Stop the timer and remove it here so future requests
|
|
// won't try to use this connection.
|
|
//
|
|
// If the timer has already fired and we're racing it, the redundant
|
|
// call to MarkDead is harmless.
|
|
if cc.idleTimer != nil {
|
|
cc.idleTimer.Stop()
|
|
}
|
|
t.connPool().MarkDead(cc)
|
|
}
|
|
if err != nil {
|
|
t.vlogf("RoundTrip failure: %v", err)
|
|
return nil, err
|
|
}
|
|
return res, nil
|
|
}
|
|
}
|
|
|
|
// CloseIdleConnections closes any connections which were previously
|
|
// connected from previous requests but are now sitting idle.
|
|
// It does not interrupt any connections currently in use.
|
|
func (t *Transport) CloseIdleConnections() {
|
|
if cp, ok := t.connPool().(clientConnPoolIdleCloser); ok {
|
|
cp.closeIdleConnections()
|
|
}
|
|
}
|
|
|
|
var (
|
|
errClientConnClosed = errors.New("http2: client conn is closed")
|
|
errClientConnUnusable = errors.New("http2: client conn not usable")
|
|
errClientConnNotEstablished = errors.New("http2: client conn could not be established")
|
|
errClientConnGotGoAway = errors.New("http2: Transport received Server's graceful shutdown GOAWAY")
|
|
)
|
|
|
|
// shouldRetryRequest is called by RoundTrip when a request fails to get
|
|
// response headers. It is always called with a non-nil error.
|
|
// It returns either a request to retry (either the same request, or a
|
|
// modified clone), or an error if the request can't be replayed.
|
|
func shouldRetryRequest(req *http.Request, err error) (*http.Request, error) {
|
|
if !canRetryError(err) {
|
|
return nil, err
|
|
}
|
|
// If the Body is nil (or http.NoBody), it's safe to reuse
|
|
// this request and its Body.
|
|
if req.Body == nil || req.Body == http.NoBody {
|
|
return req, nil
|
|
}
|
|
|
|
// If the request body can be reset back to its original
|
|
// state via the optional req.GetBody, do that.
|
|
if req.GetBody != nil {
|
|
body, err := req.GetBody()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
newReq := *req
|
|
newReq.Body = body
|
|
return &newReq, nil
|
|
}
|
|
|
|
// The Request.Body can't reset back to the beginning, but we
|
|
// don't seem to have started to read from it yet, so reuse
|
|
// the request directly.
|
|
if err == errClientConnUnusable {
|
|
return req, nil
|
|
}
|
|
|
|
return nil, fmt.Errorf("http2: Transport: cannot retry err [%v] after Request.Body was written; define Request.GetBody to avoid this error", err)
|
|
}
|
|
|
|
func canRetryError(err error) bool {
|
|
if err == errClientConnUnusable || err == errClientConnGotGoAway {
|
|
return true
|
|
}
|
|
if se, ok := err.(StreamError); ok {
|
|
if se.Code == ErrCodeProtocol && se.Cause == errFromPeer {
|
|
// See golang/go#47635, golang/go#42777
|
|
return true
|
|
}
|
|
return se.Code == ErrCodeRefusedStream
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (t *Transport) dialClientConn(ctx context.Context, addr string, singleUse bool) (*ClientConn, error) {
|
|
if t.transportTestHooks != nil {
|
|
return t.newClientConn(nil, singleUse)
|
|
}
|
|
host, _, err := net.SplitHostPort(addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tconn, err := t.dialTLS(ctx, "tcp", addr, t.newTLSConfig(host))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return t.newClientConn(tconn, singleUse)
|
|
}
|
|
|
|
func (t *Transport) newTLSConfig(host string) *tls.Config {
|
|
cfg := new(tls.Config)
|
|
if t.TLSClientConfig != nil {
|
|
*cfg = *t.TLSClientConfig.Clone()
|
|
}
|
|
if !strSliceContains(cfg.NextProtos, NextProtoTLS) {
|
|
cfg.NextProtos = append([]string{NextProtoTLS}, cfg.NextProtos...)
|
|
}
|
|
if cfg.ServerName == "" {
|
|
cfg.ServerName = host
|
|
}
|
|
return cfg
|
|
}
|
|
|
|
func (t *Transport) dialTLS(ctx context.Context, network, addr string, tlsCfg *tls.Config) (net.Conn, error) {
|
|
if t.DialTLSContext != nil {
|
|
return t.DialTLSContext(ctx, network, addr, tlsCfg)
|
|
} else if t.DialTLS != nil {
|
|
return t.DialTLS(network, addr, tlsCfg)
|
|
}
|
|
|
|
tlsCn, err := t.dialTLSWithContext(ctx, network, addr, tlsCfg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
state := tlsCn.ConnectionState()
|
|
if p := state.NegotiatedProtocol; p != NextProtoTLS {
|
|
return nil, fmt.Errorf("http2: unexpected ALPN protocol %q; want %q", p, NextProtoTLS)
|
|
}
|
|
if !state.NegotiatedProtocolIsMutual {
|
|
return nil, errors.New("http2: could not negotiate protocol mutually")
|
|
}
|
|
return tlsCn, nil
|
|
}
|
|
|
|
// disableKeepAlives reports whether connections should be closed as
|
|
// soon as possible after handling the first request.
|
|
func (t *Transport) disableKeepAlives() bool {
|
|
return t.t1 != nil && t.t1.DisableKeepAlives
|
|
}
|
|
|
|
func (t *Transport) expectContinueTimeout() time.Duration {
|
|
if t.t1 == nil {
|
|
return 0
|
|
}
|
|
return t.t1.ExpectContinueTimeout
|
|
}
|
|
|
|
func (t *Transport) NewClientConn(c net.Conn) (*ClientConn, error) {
|
|
return t.newClientConn(c, t.disableKeepAlives())
|
|
}
|
|
|
|
func (t *Transport) newClientConn(c net.Conn, singleUse bool) (*ClientConn, error) {
|
|
conf := configFromTransport(t)
|
|
cc := &ClientConn{
|
|
t: t,
|
|
tconn: c,
|
|
readerDone: make(chan struct{}),
|
|
nextStreamID: 1,
|
|
maxFrameSize: 16 << 10, // spec default
|
|
initialWindowSize: 65535, // spec default
|
|
initialStreamRecvWindowSize: conf.MaxUploadBufferPerStream,
|
|
maxConcurrentStreams: initialMaxConcurrentStreams, // "infinite", per spec. Use a smaller value until we have received server settings.
|
|
peerMaxHeaderListSize: 0xffffffffffffffff, // "infinite", per spec. Use 2^64-1 instead.
|
|
streams: make(map[uint32]*clientStream),
|
|
singleUse: singleUse,
|
|
seenSettingsChan: make(chan struct{}),
|
|
wantSettingsAck: true,
|
|
readIdleTimeout: conf.SendPingTimeout,
|
|
pingTimeout: conf.PingTimeout,
|
|
pings: make(map[[8]byte]chan struct{}),
|
|
reqHeaderMu: make(chan struct{}, 1),
|
|
lastActive: t.now(),
|
|
}
|
|
var group synctestGroupInterface
|
|
if t.transportTestHooks != nil {
|
|
t.markNewGoroutine()
|
|
t.transportTestHooks.newclientconn(cc)
|
|
c = cc.tconn
|
|
group = t.group
|
|
}
|
|
if VerboseLogs {
|
|
t.vlogf("http2: Transport creating client conn %p to %v", cc, c.RemoteAddr())
|
|
}
|
|
|
|
cc.cond = sync.NewCond(&cc.mu)
|
|
cc.flow.add(int32(initialWindowSize))
|
|
|
|
// TODO: adjust this writer size to account for frame size +
|
|
// MTU + crypto/tls record padding.
|
|
cc.bw = bufio.NewWriter(stickyErrWriter{
|
|
group: group,
|
|
conn: c,
|
|
timeout: conf.WriteByteTimeout,
|
|
err: &cc.werr,
|
|
})
|
|
cc.br = bufio.NewReader(c)
|
|
cc.fr = NewFramer(cc.bw, cc.br)
|
|
cc.fr.SetMaxReadFrameSize(conf.MaxReadFrameSize)
|
|
if t.CountError != nil {
|
|
cc.fr.countError = t.CountError
|
|
}
|
|
maxHeaderTableSize := conf.MaxDecoderHeaderTableSize
|
|
cc.fr.ReadMetaHeaders = hpack.NewDecoder(maxHeaderTableSize, nil)
|
|
cc.fr.MaxHeaderListSize = t.maxHeaderListSize()
|
|
|
|
cc.henc = hpack.NewEncoder(&cc.hbuf)
|
|
cc.henc.SetMaxDynamicTableSizeLimit(conf.MaxEncoderHeaderTableSize)
|
|
cc.peerMaxHeaderTableSize = initialHeaderTableSize
|
|
|
|
if cs, ok := c.(connectionStater); ok {
|
|
state := cs.ConnectionState()
|
|
cc.tlsState = &state
|
|
}
|
|
|
|
initialSettings := []Setting{
|
|
{ID: SettingEnablePush, Val: 0},
|
|
{ID: SettingInitialWindowSize, Val: uint32(cc.initialStreamRecvWindowSize)},
|
|
}
|
|
initialSettings = append(initialSettings, Setting{ID: SettingMaxFrameSize, Val: conf.MaxReadFrameSize})
|
|
if max := t.maxHeaderListSize(); max != 0 {
|
|
initialSettings = append(initialSettings, Setting{ID: SettingMaxHeaderListSize, Val: max})
|
|
}
|
|
if maxHeaderTableSize != initialHeaderTableSize {
|
|
initialSettings = append(initialSettings, Setting{ID: SettingHeaderTableSize, Val: maxHeaderTableSize})
|
|
}
|
|
|
|
cc.bw.Write(clientPreface)
|
|
cc.fr.WriteSettings(initialSettings...)
|
|
cc.fr.WriteWindowUpdate(0, uint32(conf.MaxUploadBufferPerConnection))
|
|
cc.inflow.init(conf.MaxUploadBufferPerConnection + initialWindowSize)
|
|
cc.bw.Flush()
|
|
if cc.werr != nil {
|
|
cc.Close()
|
|
return nil, cc.werr
|
|
}
|
|
|
|
// Start the idle timer after the connection is fully initialized.
|
|
if d := t.idleConnTimeout(); d != 0 {
|
|
cc.idleTimeout = d
|
|
cc.idleTimer = t.afterFunc(d, cc.onIdleTimeout)
|
|
}
|
|
|
|
go cc.readLoop()
|
|
return cc, nil
|
|
}
|
|
|
|
func (cc *ClientConn) healthCheck() {
|
|
pingTimeout := cc.pingTimeout
|
|
// We don't need to periodically ping in the health check, because the readLoop of ClientConn will
|
|
// trigger the healthCheck again if there is no frame received.
|
|
ctx, cancel := cc.t.contextWithTimeout(context.Background(), pingTimeout)
|
|
defer cancel()
|
|
cc.vlogf("http2: Transport sending health check")
|
|
err := cc.Ping(ctx)
|
|
if err != nil {
|
|
cc.vlogf("http2: Transport health check failure: %v", err)
|
|
cc.closeForLostPing()
|
|
} else {
|
|
cc.vlogf("http2: Transport health check success")
|
|
}
|
|
}
|
|
|
|
// SetDoNotReuse marks cc as not reusable for future HTTP requests.
|
|
func (cc *ClientConn) SetDoNotReuse() {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
cc.doNotReuse = true
|
|
}
|
|
|
|
func (cc *ClientConn) setGoAway(f *GoAwayFrame) {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
old := cc.goAway
|
|
cc.goAway = f
|
|
|
|
// Merge the previous and current GoAway error frames.
|
|
if cc.goAwayDebug == "" {
|
|
cc.goAwayDebug = string(f.DebugData())
|
|
}
|
|
if old != nil && old.ErrCode != ErrCodeNo {
|
|
cc.goAway.ErrCode = old.ErrCode
|
|
}
|
|
last := f.LastStreamID
|
|
for streamID, cs := range cc.streams {
|
|
if streamID <= last {
|
|
// The server's GOAWAY indicates that it received this stream.
|
|
// It will either finish processing it, or close the connection
|
|
// without doing so. Either way, leave the stream alone for now.
|
|
continue
|
|
}
|
|
if streamID == 1 && cc.goAway.ErrCode != ErrCodeNo {
|
|
// Don't retry the first stream on a connection if we get a non-NO error.
|
|
// If the server is sending an error on a new connection,
|
|
// retrying the request on a new one probably isn't going to work.
|
|
cs.abortStreamLocked(fmt.Errorf("http2: Transport received GOAWAY from server ErrCode:%v", cc.goAway.ErrCode))
|
|
} else {
|
|
// Aborting the stream with errClentConnGotGoAway indicates that
|
|
// the request should be retried on a new connection.
|
|
cs.abortStreamLocked(errClientConnGotGoAway)
|
|
}
|
|
}
|
|
}
|
|
|
|
// CanTakeNewRequest reports whether the connection can take a new request,
|
|
// meaning it has not been closed or received or sent a GOAWAY.
|
|
//
|
|
// If the caller is going to immediately make a new request on this
|
|
// connection, use ReserveNewRequest instead.
|
|
func (cc *ClientConn) CanTakeNewRequest() bool {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return cc.canTakeNewRequestLocked()
|
|
}
|
|
|
|
// ReserveNewRequest is like CanTakeNewRequest but also reserves a
|
|
// concurrent stream in cc. The reservation is decremented on the
|
|
// next call to RoundTrip.
|
|
func (cc *ClientConn) ReserveNewRequest() bool {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
if st := cc.idleStateLocked(); !st.canTakeNewRequest {
|
|
return false
|
|
}
|
|
cc.streamsReserved++
|
|
return true
|
|
}
|
|
|
|
// ClientConnState describes the state of a ClientConn.
|
|
type ClientConnState struct {
|
|
// Closed is whether the connection is closed.
|
|
Closed bool
|
|
|
|
// Closing is whether the connection is in the process of
|
|
// closing. It may be closing due to shutdown, being a
|
|
// single-use connection, being marked as DoNotReuse, or
|
|
// having received a GOAWAY frame.
|
|
Closing bool
|
|
|
|
// StreamsActive is how many streams are active.
|
|
StreamsActive int
|
|
|
|
// StreamsReserved is how many streams have been reserved via
|
|
// ClientConn.ReserveNewRequest.
|
|
StreamsReserved int
|
|
|
|
// StreamsPending is how many requests have been sent in excess
|
|
// of the peer's advertised MaxConcurrentStreams setting and
|
|
// are waiting for other streams to complete.
|
|
StreamsPending int
|
|
|
|
// MaxConcurrentStreams is how many concurrent streams the
|
|
// peer advertised as acceptable. Zero means no SETTINGS
|
|
// frame has been received yet.
|
|
MaxConcurrentStreams uint32
|
|
|
|
// LastIdle, if non-zero, is when the connection last
|
|
// transitioned to idle state.
|
|
LastIdle time.Time
|
|
}
|
|
|
|
// State returns a snapshot of cc's state.
|
|
func (cc *ClientConn) State() ClientConnState {
|
|
cc.wmu.Lock()
|
|
maxConcurrent := cc.maxConcurrentStreams
|
|
if !cc.seenSettings {
|
|
maxConcurrent = 0
|
|
}
|
|
cc.wmu.Unlock()
|
|
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return ClientConnState{
|
|
Closed: cc.closed,
|
|
Closing: cc.closing || cc.singleUse || cc.doNotReuse || cc.goAway != nil,
|
|
StreamsActive: len(cc.streams) + cc.pendingResets,
|
|
StreamsReserved: cc.streamsReserved,
|
|
StreamsPending: cc.pendingRequests,
|
|
LastIdle: cc.lastIdle,
|
|
MaxConcurrentStreams: maxConcurrent,
|
|
}
|
|
}
|
|
|
|
// clientConnIdleState describes the suitability of a client
|
|
// connection to initiate a new RoundTrip request.
|
|
type clientConnIdleState struct {
|
|
canTakeNewRequest bool
|
|
}
|
|
|
|
func (cc *ClientConn) idleState() clientConnIdleState {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return cc.idleStateLocked()
|
|
}
|
|
|
|
func (cc *ClientConn) idleStateLocked() (st clientConnIdleState) {
|
|
if cc.singleUse && cc.nextStreamID > 1 {
|
|
return
|
|
}
|
|
var maxConcurrentOkay bool
|
|
if cc.t.StrictMaxConcurrentStreams {
|
|
// We'll tell the caller we can take a new request to
|
|
// prevent the caller from dialing a new TCP
|
|
// connection, but then we'll block later before
|
|
// writing it.
|
|
maxConcurrentOkay = true
|
|
} else {
|
|
// We can take a new request if the total of
|
|
// - active streams;
|
|
// - reservation slots for new streams; and
|
|
// - streams for which we have sent a RST_STREAM and a PING,
|
|
// but received no subsequent frame
|
|
// is less than the concurrency limit.
|
|
maxConcurrentOkay = cc.currentRequestCountLocked() < int(cc.maxConcurrentStreams)
|
|
}
|
|
|
|
st.canTakeNewRequest = cc.goAway == nil && !cc.closed && !cc.closing && maxConcurrentOkay &&
|
|
!cc.doNotReuse &&
|
|
int64(cc.nextStreamID)+2*int64(cc.pendingRequests) < math.MaxInt32 &&
|
|
!cc.tooIdleLocked()
|
|
|
|
// If this connection has never been used for a request and is closed,
|
|
// then let it take a request (which will fail).
|
|
// If the conn was closed for idleness, we're racing the idle timer;
|
|
// don't try to use the conn. (Issue #70515.)
|
|
//
|
|
// This avoids a situation where an error early in a connection's lifetime
|
|
// goes unreported.
|
|
if cc.nextStreamID == 1 && cc.streamsReserved == 0 && cc.closed && !cc.closedOnIdle {
|
|
st.canTakeNewRequest = true
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// currentRequestCountLocked reports the number of concurrency slots currently in use,
|
|
// including active streams, reserved slots, and reset streams waiting for acknowledgement.
|
|
func (cc *ClientConn) currentRequestCountLocked() int {
|
|
return len(cc.streams) + cc.streamsReserved + cc.pendingResets
|
|
}
|
|
|
|
func (cc *ClientConn) canTakeNewRequestLocked() bool {
|
|
st := cc.idleStateLocked()
|
|
return st.canTakeNewRequest
|
|
}
|
|
|
|
// tooIdleLocked reports whether this connection has been been sitting idle
|
|
// for too much wall time.
|
|
func (cc *ClientConn) tooIdleLocked() bool {
|
|
// The Round(0) strips the monontonic clock reading so the
|
|
// times are compared based on their wall time. We don't want
|
|
// to reuse a connection that's been sitting idle during
|
|
// VM/laptop suspend if monotonic time was also frozen.
|
|
return cc.idleTimeout != 0 && !cc.lastIdle.IsZero() && cc.t.timeSince(cc.lastIdle.Round(0)) > cc.idleTimeout
|
|
}
|
|
|
|
// onIdleTimeout is called from a time.AfterFunc goroutine. It will
|
|
// only be called when we're idle, but because we're coming from a new
|
|
// goroutine, there could be a new request coming in at the same time,
|
|
// so this simply calls the synchronized closeIfIdle to shut down this
|
|
// connection. The timer could just call closeIfIdle, but this is more
|
|
// clear.
|
|
func (cc *ClientConn) onIdleTimeout() {
|
|
cc.closeIfIdle()
|
|
}
|
|
|
|
func (cc *ClientConn) closeConn() {
|
|
t := time.AfterFunc(250*time.Millisecond, cc.forceCloseConn)
|
|
defer t.Stop()
|
|
cc.tconn.Close()
|
|
}
|
|
|
|
// A tls.Conn.Close can hang for a long time if the peer is unresponsive.
|
|
// Try to shut it down more aggressively.
|
|
func (cc *ClientConn) forceCloseConn() {
|
|
tc, ok := cc.tconn.(*tls.Conn)
|
|
if !ok {
|
|
return
|
|
}
|
|
if nc := tc.NetConn(); nc != nil {
|
|
nc.Close()
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) closeIfIdle() {
|
|
cc.mu.Lock()
|
|
if len(cc.streams) > 0 || cc.streamsReserved > 0 {
|
|
cc.mu.Unlock()
|
|
return
|
|
}
|
|
cc.closed = true
|
|
cc.closedOnIdle = true
|
|
nextID := cc.nextStreamID
|
|
// TODO: do clients send GOAWAY too? maybe? Just Close:
|
|
cc.mu.Unlock()
|
|
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport closing idle conn %p (forSingleUse=%v, maxStream=%v)", cc, cc.singleUse, nextID-2)
|
|
}
|
|
cc.closeConn()
|
|
}
|
|
|
|
func (cc *ClientConn) isDoNotReuseAndIdle() bool {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return cc.doNotReuse && len(cc.streams) == 0
|
|
}
|
|
|
|
var shutdownEnterWaitStateHook = func() {}
|
|
|
|
// Shutdown gracefully closes the client connection, waiting for running streams to complete.
|
|
func (cc *ClientConn) Shutdown(ctx context.Context) error {
|
|
if err := cc.sendGoAway(); err != nil {
|
|
return err
|
|
}
|
|
// Wait for all in-flight streams to complete or connection to close
|
|
done := make(chan struct{})
|
|
cancelled := false // guarded by cc.mu
|
|
go func() {
|
|
cc.t.markNewGoroutine()
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
for {
|
|
if len(cc.streams) == 0 || cc.closed {
|
|
cc.closed = true
|
|
close(done)
|
|
break
|
|
}
|
|
if cancelled {
|
|
break
|
|
}
|
|
cc.cond.Wait()
|
|
}
|
|
}()
|
|
shutdownEnterWaitStateHook()
|
|
select {
|
|
case <-done:
|
|
cc.closeConn()
|
|
return nil
|
|
case <-ctx.Done():
|
|
cc.mu.Lock()
|
|
// Free the goroutine above
|
|
cancelled = true
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
return ctx.Err()
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) sendGoAway() error {
|
|
cc.mu.Lock()
|
|
closing := cc.closing
|
|
cc.closing = true
|
|
maxStreamID := cc.nextStreamID
|
|
cc.mu.Unlock()
|
|
if closing {
|
|
// GOAWAY sent already
|
|
return nil
|
|
}
|
|
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
// Send a graceful shutdown frame to server
|
|
if err := cc.fr.WriteGoAway(maxStreamID, ErrCodeNo, nil); err != nil {
|
|
return err
|
|
}
|
|
if err := cc.bw.Flush(); err != nil {
|
|
return err
|
|
}
|
|
// Prevent new requests
|
|
return nil
|
|
}
|
|
|
|
// closes the client connection immediately. In-flight requests are interrupted.
|
|
// err is sent to streams.
|
|
func (cc *ClientConn) closeForError(err error) {
|
|
cc.mu.Lock()
|
|
cc.closed = true
|
|
for _, cs := range cc.streams {
|
|
cs.abortStreamLocked(err)
|
|
}
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
cc.closeConn()
|
|
}
|
|
|
|
// Close closes the client connection immediately.
|
|
//
|
|
// In-flight requests are interrupted. For a graceful shutdown, use Shutdown instead.
|
|
func (cc *ClientConn) Close() error {
|
|
err := errors.New("http2: client connection force closed via ClientConn.Close")
|
|
cc.closeForError(err)
|
|
return nil
|
|
}
|
|
|
|
// closes the client connection immediately. In-flight requests are interrupted.
|
|
func (cc *ClientConn) closeForLostPing() {
|
|
err := errors.New("http2: client connection lost")
|
|
if f := cc.t.CountError; f != nil {
|
|
f("conn_close_lost_ping")
|
|
}
|
|
cc.closeForError(err)
|
|
}
|
|
|
|
// errRequestCanceled is a copy of net/http's errRequestCanceled because it's not
|
|
// exported. At least they'll be DeepEqual for h1-vs-h2 comparisons tests.
|
|
var errRequestCanceled = errors.New("net/http: request canceled")
|
|
|
|
func (cc *ClientConn) responseHeaderTimeout() time.Duration {
|
|
if cc.t.t1 != nil {
|
|
return cc.t.t1.ResponseHeaderTimeout
|
|
}
|
|
// No way to do this (yet?) with just an http2.Transport. Probably
|
|
// no need. Request.Cancel this is the new way. We only need to support
|
|
// this for compatibility with the old http.Transport fields when
|
|
// we're doing transparent http2.
|
|
return 0
|
|
}
|
|
|
|
// actualContentLength returns a sanitized version of
|
|
// req.ContentLength, where 0 actually means zero (not unknown) and -1
|
|
// means unknown.
|
|
func actualContentLength(req *http.Request) int64 {
|
|
if req.Body == nil || req.Body == http.NoBody {
|
|
return 0
|
|
}
|
|
if req.ContentLength != 0 {
|
|
return req.ContentLength
|
|
}
|
|
return -1
|
|
}
|
|
|
|
func (cc *ClientConn) decrStreamReservations() {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
cc.decrStreamReservationsLocked()
|
|
}
|
|
|
|
func (cc *ClientConn) decrStreamReservationsLocked() {
|
|
if cc.streamsReserved > 0 {
|
|
cc.streamsReserved--
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
return cc.roundTrip(req, nil)
|
|
}
|
|
|
|
func (cc *ClientConn) roundTrip(req *http.Request, streamf func(*clientStream)) (*http.Response, error) {
|
|
ctx := req.Context()
|
|
cs := &clientStream{
|
|
cc: cc,
|
|
ctx: ctx,
|
|
reqCancel: req.Cancel,
|
|
isHead: req.Method == "HEAD",
|
|
reqBody: req.Body,
|
|
reqBodyContentLength: actualContentLength(req),
|
|
trace: httptrace.ContextClientTrace(ctx),
|
|
peerClosed: make(chan struct{}),
|
|
abort: make(chan struct{}),
|
|
respHeaderRecv: make(chan struct{}),
|
|
donec: make(chan struct{}),
|
|
}
|
|
|
|
cs.requestedGzip = httpcommon.IsRequestGzip(req.Method, req.Header, cc.t.disableCompression())
|
|
|
|
go cs.doRequest(req, streamf)
|
|
|
|
waitDone := func() error {
|
|
select {
|
|
case <-cs.donec:
|
|
return nil
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
}
|
|
}
|
|
|
|
handleResponseHeaders := func() (*http.Response, error) {
|
|
res := cs.res
|
|
if res.StatusCode > 299 {
|
|
// On error or status code 3xx, 4xx, 5xx, etc abort any
|
|
// ongoing write, assuming that the server doesn't care
|
|
// about our request body. If the server replied with 1xx or
|
|
// 2xx, however, then assume the server DOES potentially
|
|
// want our body (e.g. full-duplex streaming:
|
|
// golang.org/issue/13444). If it turns out the server
|
|
// doesn't, they'll RST_STREAM us soon enough. This is a
|
|
// heuristic to avoid adding knobs to Transport. Hopefully
|
|
// we can keep it.
|
|
cs.abortRequestBodyWrite()
|
|
}
|
|
res.Request = req
|
|
res.TLS = cc.tlsState
|
|
if res.Body == noBody && actualContentLength(req) == 0 {
|
|
// If there isn't a request or response body still being
|
|
// written, then wait for the stream to be closed before
|
|
// RoundTrip returns.
|
|
if err := waitDone(); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
cancelRequest := func(cs *clientStream, err error) error {
|
|
cs.cc.mu.Lock()
|
|
bodyClosed := cs.reqBodyClosed
|
|
cs.cc.mu.Unlock()
|
|
// Wait for the request body to be closed.
|
|
//
|
|
// If nothing closed the body before now, abortStreamLocked
|
|
// will have started a goroutine to close it.
|
|
//
|
|
// Closing the body before returning avoids a race condition
|
|
// with net/http checking its readTrackingBody to see if the
|
|
// body was read from or closed. See golang/go#60041.
|
|
//
|
|
// The body is closed in a separate goroutine without the
|
|
// connection mutex held, but dropping the mutex before waiting
|
|
// will keep us from holding it indefinitely if the body
|
|
// close is slow for some reason.
|
|
if bodyClosed != nil {
|
|
<-bodyClosed
|
|
}
|
|
return err
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case <-cs.respHeaderRecv:
|
|
return handleResponseHeaders()
|
|
case <-cs.abort:
|
|
select {
|
|
case <-cs.respHeaderRecv:
|
|
// If both cs.respHeaderRecv and cs.abort are signaling,
|
|
// pick respHeaderRecv. The server probably wrote the
|
|
// response and immediately reset the stream.
|
|
// golang.org/issue/49645
|
|
return handleResponseHeaders()
|
|
default:
|
|
waitDone()
|
|
return nil, cs.abortErr
|
|
}
|
|
case <-ctx.Done():
|
|
err := ctx.Err()
|
|
cs.abortStream(err)
|
|
return nil, cancelRequest(cs, err)
|
|
case <-cs.reqCancel:
|
|
cs.abortStream(errRequestCanceled)
|
|
return nil, cancelRequest(cs, errRequestCanceled)
|
|
}
|
|
}
|
|
}
|
|
|
|
// doRequest runs for the duration of the request lifetime.
|
|
//
|
|
// It sends the request and performs post-request cleanup (closing Request.Body, etc.).
|
|
func (cs *clientStream) doRequest(req *http.Request, streamf func(*clientStream)) {
|
|
cs.cc.t.markNewGoroutine()
|
|
err := cs.writeRequest(req, streamf)
|
|
cs.cleanupWriteRequest(err)
|
|
}
|
|
|
|
var errExtendedConnectNotSupported = errors.New("net/http: extended connect not supported by peer")
|
|
|
|
// writeRequest sends a request.
|
|
//
|
|
// It returns nil after the request is written, the response read,
|
|
// and the request stream is half-closed by the peer.
|
|
//
|
|
// It returns non-nil if the request ends otherwise.
|
|
// If the returned error is StreamError, the error Code may be used in resetting the stream.
|
|
func (cs *clientStream) writeRequest(req *http.Request, streamf func(*clientStream)) (err error) {
|
|
cc := cs.cc
|
|
ctx := cs.ctx
|
|
|
|
// wait for setting frames to be received, a server can change this value later,
|
|
// but we just wait for the first settings frame
|
|
var isExtendedConnect bool
|
|
if req.Method == "CONNECT" && req.Header.Get(":protocol") != "" {
|
|
isExtendedConnect = true
|
|
}
|
|
|
|
// Acquire the new-request lock by writing to reqHeaderMu.
|
|
// This lock guards the critical section covering allocating a new stream ID
|
|
// (requires mu) and creating the stream (requires wmu).
|
|
if cc.reqHeaderMu == nil {
|
|
panic("RoundTrip on uninitialized ClientConn") // for tests
|
|
}
|
|
if isExtendedConnect {
|
|
select {
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cc.seenSettingsChan:
|
|
if !cc.extendedConnectAllowed {
|
|
return errExtendedConnectNotSupported
|
|
}
|
|
}
|
|
}
|
|
select {
|
|
case cc.reqHeaderMu <- struct{}{}:
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
if cc.idleTimer != nil {
|
|
cc.idleTimer.Stop()
|
|
}
|
|
cc.decrStreamReservationsLocked()
|
|
if err := cc.awaitOpenSlotForStreamLocked(cs); err != nil {
|
|
cc.mu.Unlock()
|
|
<-cc.reqHeaderMu
|
|
return err
|
|
}
|
|
cc.addStreamLocked(cs) // assigns stream ID
|
|
if isConnectionCloseRequest(req) {
|
|
cc.doNotReuse = true
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
if streamf != nil {
|
|
streamf(cs)
|
|
}
|
|
|
|
continueTimeout := cc.t.expectContinueTimeout()
|
|
if continueTimeout != 0 {
|
|
if !httpguts.HeaderValuesContainsToken(req.Header["Expect"], "100-continue") {
|
|
continueTimeout = 0
|
|
} else {
|
|
cs.on100 = make(chan struct{}, 1)
|
|
}
|
|
}
|
|
|
|
// Past this point (where we send request headers), it is possible for
|
|
// RoundTrip to return successfully. Since the RoundTrip contract permits
|
|
// the caller to "mutate or reuse" the Request after closing the Response's Body,
|
|
// we must take care when referencing the Request from here on.
|
|
err = cs.encodeAndWriteHeaders(req)
|
|
<-cc.reqHeaderMu
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hasBody := cs.reqBodyContentLength != 0
|
|
if !hasBody {
|
|
cs.sentEndStream = true
|
|
} else {
|
|
if continueTimeout != 0 {
|
|
traceWait100Continue(cs.trace)
|
|
timer := time.NewTimer(continueTimeout)
|
|
select {
|
|
case <-timer.C:
|
|
err = nil
|
|
case <-cs.on100:
|
|
err = nil
|
|
case <-cs.abort:
|
|
err = cs.abortErr
|
|
case <-ctx.Done():
|
|
err = ctx.Err()
|
|
case <-cs.reqCancel:
|
|
err = errRequestCanceled
|
|
}
|
|
timer.Stop()
|
|
if err != nil {
|
|
traceWroteRequest(cs.trace, err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
if err = cs.writeRequestBody(req); err != nil {
|
|
if err != errStopReqBodyWrite {
|
|
traceWroteRequest(cs.trace, err)
|
|
return err
|
|
}
|
|
} else {
|
|
cs.sentEndStream = true
|
|
}
|
|
}
|
|
|
|
traceWroteRequest(cs.trace, err)
|
|
|
|
var respHeaderTimer <-chan time.Time
|
|
var respHeaderRecv chan struct{}
|
|
if d := cc.responseHeaderTimeout(); d != 0 {
|
|
timer := cc.t.newTimer(d)
|
|
defer timer.Stop()
|
|
respHeaderTimer = timer.C()
|
|
respHeaderRecv = cs.respHeaderRecv
|
|
}
|
|
// Wait until the peer half-closes its end of the stream,
|
|
// or until the request is aborted (via context, error, or otherwise),
|
|
// whichever comes first.
|
|
for {
|
|
select {
|
|
case <-cs.peerClosed:
|
|
return nil
|
|
case <-respHeaderTimer:
|
|
return errTimeout
|
|
case <-respHeaderRecv:
|
|
respHeaderRecv = nil
|
|
respHeaderTimer = nil // keep waiting for END_STREAM
|
|
case <-cs.abort:
|
|
return cs.abortErr
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
}
|
|
}
|
|
}
|
|
|
|
func (cs *clientStream) encodeAndWriteHeaders(req *http.Request) error {
|
|
cc := cs.cc
|
|
ctx := cs.ctx
|
|
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
|
|
// If the request was canceled while waiting for cc.mu, just quit.
|
|
select {
|
|
case <-cs.abort:
|
|
return cs.abortErr
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
default:
|
|
}
|
|
|
|
// Encode headers.
|
|
//
|
|
// we send: HEADERS{1}, CONTINUATION{0,} + DATA{0,} (DATA is
|
|
// sent by writeRequestBody below, along with any Trailers,
|
|
// again in form HEADERS{1}, CONTINUATION{0,})
|
|
cc.hbuf.Reset()
|
|
res, err := encodeRequestHeaders(req, cs.requestedGzip, cc.peerMaxHeaderListSize, func(name, value string) {
|
|
cc.writeHeader(name, value)
|
|
})
|
|
if err != nil {
|
|
return fmt.Errorf("http2: %w", err)
|
|
}
|
|
hdrs := cc.hbuf.Bytes()
|
|
|
|
// Write the request.
|
|
endStream := !res.HasBody && !res.HasTrailers
|
|
cs.sentHeaders = true
|
|
err = cc.writeHeaders(cs.ID, endStream, int(cc.maxFrameSize), hdrs)
|
|
traceWroteHeaders(cs.trace)
|
|
return err
|
|
}
|
|
|
|
func encodeRequestHeaders(req *http.Request, addGzipHeader bool, peerMaxHeaderListSize uint64, headerf func(name, value string)) (httpcommon.EncodeHeadersResult, error) {
|
|
return httpcommon.EncodeHeaders(req.Context(), httpcommon.EncodeHeadersParam{
|
|
Request: httpcommon.Request{
|
|
Header: req.Header,
|
|
Trailer: req.Trailer,
|
|
URL: req.URL,
|
|
Host: req.Host,
|
|
Method: req.Method,
|
|
ActualContentLength: actualContentLength(req),
|
|
},
|
|
AddGzipHeader: addGzipHeader,
|
|
PeerMaxHeaderListSize: peerMaxHeaderListSize,
|
|
DefaultUserAgent: defaultUserAgent,
|
|
}, headerf)
|
|
}
|
|
|
|
// cleanupWriteRequest performs post-request tasks.
|
|
//
|
|
// If err (the result of writeRequest) is non-nil and the stream is not closed,
|
|
// cleanupWriteRequest will send a reset to the peer.
|
|
func (cs *clientStream) cleanupWriteRequest(err error) {
|
|
cc := cs.cc
|
|
|
|
if cs.ID == 0 {
|
|
// We were canceled before creating the stream, so return our reservation.
|
|
cc.decrStreamReservations()
|
|
}
|
|
|
|
// TODO: write h12Compare test showing whether
|
|
// Request.Body is closed by the Transport,
|
|
// and in multiple cases: server replies <=299 and >299
|
|
// while still writing request body
|
|
cc.mu.Lock()
|
|
mustCloseBody := false
|
|
if cs.reqBody != nil && cs.reqBodyClosed == nil {
|
|
mustCloseBody = true
|
|
cs.reqBodyClosed = make(chan struct{})
|
|
}
|
|
bodyClosed := cs.reqBodyClosed
|
|
closeOnIdle := cc.singleUse || cc.doNotReuse || cc.t.disableKeepAlives() || cc.goAway != nil
|
|
cc.mu.Unlock()
|
|
if mustCloseBody {
|
|
cs.reqBody.Close()
|
|
close(bodyClosed)
|
|
}
|
|
if bodyClosed != nil {
|
|
<-bodyClosed
|
|
}
|
|
|
|
if err != nil && cs.sentEndStream {
|
|
// If the connection is closed immediately after the response is read,
|
|
// we may be aborted before finishing up here. If the stream was closed
|
|
// cleanly on both sides, there is no error.
|
|
select {
|
|
case <-cs.peerClosed:
|
|
err = nil
|
|
default:
|
|
}
|
|
}
|
|
if err != nil {
|
|
cs.abortStream(err) // possibly redundant, but harmless
|
|
if cs.sentHeaders {
|
|
if se, ok := err.(StreamError); ok {
|
|
if se.Cause != errFromPeer {
|
|
cc.writeStreamReset(cs.ID, se.Code, false, err)
|
|
}
|
|
} else {
|
|
// We're cancelling an in-flight request.
|
|
//
|
|
// This could be due to the server becoming unresponsive.
|
|
// To avoid sending too many requests on a dead connection,
|
|
// we let the request continue to consume a concurrency slot
|
|
// until we can confirm the server is still responding.
|
|
// We do this by sending a PING frame along with the RST_STREAM
|
|
// (unless a ping is already in flight).
|
|
//
|
|
// For simplicity, we don't bother tracking the PING payload:
|
|
// We reset cc.pendingResets any time we receive a PING ACK.
|
|
//
|
|
// We skip this if the conn is going to be closed on idle,
|
|
// because it's short lived and will probably be closed before
|
|
// we get the ping response.
|
|
ping := false
|
|
if !closeOnIdle {
|
|
cc.mu.Lock()
|
|
// rstStreamPingsBlocked works around a gRPC behavior:
|
|
// see comment on the field for details.
|
|
if !cc.rstStreamPingsBlocked {
|
|
if cc.pendingResets == 0 {
|
|
ping = true
|
|
}
|
|
cc.pendingResets++
|
|
}
|
|
cc.mu.Unlock()
|
|
}
|
|
cc.writeStreamReset(cs.ID, ErrCodeCancel, ping, err)
|
|
}
|
|
}
|
|
cs.bufPipe.CloseWithError(err) // no-op if already closed
|
|
} else {
|
|
if cs.sentHeaders && !cs.sentEndStream {
|
|
cc.writeStreamReset(cs.ID, ErrCodeNo, false, nil)
|
|
}
|
|
cs.bufPipe.CloseWithError(errRequestCanceled)
|
|
}
|
|
if cs.ID != 0 {
|
|
cc.forgetStreamID(cs.ID)
|
|
}
|
|
|
|
cc.wmu.Lock()
|
|
werr := cc.werr
|
|
cc.wmu.Unlock()
|
|
if werr != nil {
|
|
cc.Close()
|
|
}
|
|
|
|
close(cs.donec)
|
|
}
|
|
|
|
// awaitOpenSlotForStreamLocked waits until len(streams) < maxConcurrentStreams.
|
|
// Must hold cc.mu.
|
|
func (cc *ClientConn) awaitOpenSlotForStreamLocked(cs *clientStream) error {
|
|
for {
|
|
if cc.closed && cc.nextStreamID == 1 && cc.streamsReserved == 0 {
|
|
// This is the very first request sent to this connection.
|
|
// Return a fatal error which aborts the retry loop.
|
|
return errClientConnNotEstablished
|
|
}
|
|
cc.lastActive = cc.t.now()
|
|
if cc.closed || !cc.canTakeNewRequestLocked() {
|
|
return errClientConnUnusable
|
|
}
|
|
cc.lastIdle = time.Time{}
|
|
if cc.currentRequestCountLocked() < int(cc.maxConcurrentStreams) {
|
|
return nil
|
|
}
|
|
cc.pendingRequests++
|
|
cc.cond.Wait()
|
|
cc.pendingRequests--
|
|
select {
|
|
case <-cs.abort:
|
|
return cs.abortErr
|
|
default:
|
|
}
|
|
}
|
|
}
|
|
|
|
// requires cc.wmu be held
|
|
func (cc *ClientConn) writeHeaders(streamID uint32, endStream bool, maxFrameSize int, hdrs []byte) error {
|
|
first := true // first frame written (HEADERS is first, then CONTINUATION)
|
|
for len(hdrs) > 0 && cc.werr == nil {
|
|
chunk := hdrs
|
|
if len(chunk) > maxFrameSize {
|
|
chunk = chunk[:maxFrameSize]
|
|
}
|
|
hdrs = hdrs[len(chunk):]
|
|
endHeaders := len(hdrs) == 0
|
|
if first {
|
|
cc.fr.WriteHeaders(HeadersFrameParam{
|
|
StreamID: streamID,
|
|
BlockFragment: chunk,
|
|
EndStream: endStream,
|
|
EndHeaders: endHeaders,
|
|
})
|
|
first = false
|
|
} else {
|
|
cc.fr.WriteContinuation(streamID, endHeaders, chunk)
|
|
}
|
|
}
|
|
cc.bw.Flush()
|
|
return cc.werr
|
|
}
|
|
|
|
// internal error values; they don't escape to callers
|
|
var (
|
|
// abort request body write; don't send cancel
|
|
errStopReqBodyWrite = errors.New("http2: aborting request body write")
|
|
|
|
// abort request body write, but send stream reset of cancel.
|
|
errStopReqBodyWriteAndCancel = errors.New("http2: canceling request")
|
|
|
|
errReqBodyTooLong = errors.New("http2: request body larger than specified content length")
|
|
)
|
|
|
|
// frameScratchBufferLen returns the length of a buffer to use for
|
|
// outgoing request bodies to read/write to/from.
|
|
//
|
|
// It returns max(1, min(peer's advertised max frame size,
|
|
// Request.ContentLength+1, 512KB)).
|
|
func (cs *clientStream) frameScratchBufferLen(maxFrameSize int) int {
|
|
const max = 512 << 10
|
|
n := int64(maxFrameSize)
|
|
if n > max {
|
|
n = max
|
|
}
|
|
if cl := cs.reqBodyContentLength; cl != -1 && cl+1 < n {
|
|
// Add an extra byte past the declared content-length to
|
|
// give the caller's Request.Body io.Reader a chance to
|
|
// give us more bytes than they declared, so we can catch it
|
|
// early.
|
|
n = cl + 1
|
|
}
|
|
if n < 1 {
|
|
return 1
|
|
}
|
|
return int(n) // doesn't truncate; max is 512K
|
|
}
|
|
|
|
// Seven bufPools manage different frame sizes. This helps to avoid scenarios where long-running
|
|
// streaming requests using small frame sizes occupy large buffers initially allocated for prior
|
|
// requests needing big buffers. The size ranges are as follows:
|
|
// {0 KB, 16 KB], {16 KB, 32 KB], {32 KB, 64 KB], {64 KB, 128 KB], {128 KB, 256 KB],
|
|
// {256 KB, 512 KB], {512 KB, infinity}
|
|
// In practice, the maximum scratch buffer size should not exceed 512 KB due to
|
|
// frameScratchBufferLen(maxFrameSize), thus the "infinity pool" should never be used.
|
|
// It exists mainly as a safety measure, for potential future increases in max buffer size.
|
|
var bufPools [7]sync.Pool // of *[]byte
|
|
func bufPoolIndex(size int) int {
|
|
if size <= 16384 {
|
|
return 0
|
|
}
|
|
size -= 1
|
|
bits := bits.Len(uint(size))
|
|
index := bits - 14
|
|
if index >= len(bufPools) {
|
|
return len(bufPools) - 1
|
|
}
|
|
return index
|
|
}
|
|
|
|
func (cs *clientStream) writeRequestBody(req *http.Request) (err error) {
|
|
cc := cs.cc
|
|
body := cs.reqBody
|
|
sentEnd := false // whether we sent the final DATA frame w/ END_STREAM
|
|
|
|
hasTrailers := req.Trailer != nil
|
|
remainLen := cs.reqBodyContentLength
|
|
hasContentLen := remainLen != -1
|
|
|
|
cc.mu.Lock()
|
|
maxFrameSize := int(cc.maxFrameSize)
|
|
cc.mu.Unlock()
|
|
|
|
// Scratch buffer for reading into & writing from.
|
|
scratchLen := cs.frameScratchBufferLen(maxFrameSize)
|
|
var buf []byte
|
|
index := bufPoolIndex(scratchLen)
|
|
if bp, ok := bufPools[index].Get().(*[]byte); ok && len(*bp) >= scratchLen {
|
|
defer bufPools[index].Put(bp)
|
|
buf = *bp
|
|
} else {
|
|
buf = make([]byte, scratchLen)
|
|
defer bufPools[index].Put(&buf)
|
|
}
|
|
|
|
var sawEOF bool
|
|
for !sawEOF {
|
|
n, err := body.Read(buf)
|
|
if hasContentLen {
|
|
remainLen -= int64(n)
|
|
if remainLen == 0 && err == nil {
|
|
// The request body's Content-Length was predeclared and
|
|
// we just finished reading it all, but the underlying io.Reader
|
|
// returned the final chunk with a nil error (which is one of
|
|
// the two valid things a Reader can do at EOF). Because we'd prefer
|
|
// to send the END_STREAM bit early, double-check that we're actually
|
|
// at EOF. Subsequent reads should return (0, EOF) at this point.
|
|
// If either value is different, we return an error in one of two ways below.
|
|
var scratch [1]byte
|
|
var n1 int
|
|
n1, err = body.Read(scratch[:])
|
|
remainLen -= int64(n1)
|
|
}
|
|
if remainLen < 0 {
|
|
err = errReqBodyTooLong
|
|
return err
|
|
}
|
|
}
|
|
if err != nil {
|
|
cc.mu.Lock()
|
|
bodyClosed := cs.reqBodyClosed != nil
|
|
cc.mu.Unlock()
|
|
switch {
|
|
case bodyClosed:
|
|
return errStopReqBodyWrite
|
|
case err == io.EOF:
|
|
sawEOF = true
|
|
err = nil
|
|
default:
|
|
return err
|
|
}
|
|
}
|
|
|
|
remain := buf[:n]
|
|
for len(remain) > 0 && err == nil {
|
|
var allowed int32
|
|
allowed, err = cs.awaitFlowControl(len(remain))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
cc.wmu.Lock()
|
|
data := remain[:allowed]
|
|
remain = remain[allowed:]
|
|
sentEnd = sawEOF && len(remain) == 0 && !hasTrailers
|
|
err = cc.fr.WriteData(cs.ID, sentEnd, data)
|
|
if err == nil {
|
|
// TODO(bradfitz): this flush is for latency, not bandwidth.
|
|
// Most requests won't need this. Make this opt-in or
|
|
// opt-out? Use some heuristic on the body type? Nagel-like
|
|
// timers? Based on 'n'? Only last chunk of this for loop,
|
|
// unless flow control tokens are low? For now, always.
|
|
// If we change this, see comment below.
|
|
err = cc.bw.Flush()
|
|
}
|
|
cc.wmu.Unlock()
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if sentEnd {
|
|
// Already sent END_STREAM (which implies we have no
|
|
// trailers) and flushed, because currently all
|
|
// WriteData frames above get a flush. So we're done.
|
|
return nil
|
|
}
|
|
|
|
// Since the RoundTrip contract permits the caller to "mutate or reuse"
|
|
// a request after the Response's Body is closed, verify that this hasn't
|
|
// happened before accessing the trailers.
|
|
cc.mu.Lock()
|
|
trailer := req.Trailer
|
|
err = cs.abortErr
|
|
cc.mu.Unlock()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
var trls []byte
|
|
if len(trailer) > 0 {
|
|
trls, err = cc.encodeTrailers(trailer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Two ways to send END_STREAM: either with trailers, or
|
|
// with an empty DATA frame.
|
|
if len(trls) > 0 {
|
|
err = cc.writeHeaders(cs.ID, true, maxFrameSize, trls)
|
|
} else {
|
|
err = cc.fr.WriteData(cs.ID, true, nil)
|
|
}
|
|
if ferr := cc.bw.Flush(); ferr != nil && err == nil {
|
|
err = ferr
|
|
}
|
|
return err
|
|
}
|
|
|
|
// awaitFlowControl waits for [1, min(maxBytes, cc.cs.maxFrameSize)] flow
|
|
// control tokens from the server.
|
|
// It returns either the non-zero number of tokens taken or an error
|
|
// if the stream is dead.
|
|
func (cs *clientStream) awaitFlowControl(maxBytes int) (taken int32, err error) {
|
|
cc := cs.cc
|
|
ctx := cs.ctx
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
for {
|
|
if cc.closed {
|
|
return 0, errClientConnClosed
|
|
}
|
|
if cs.reqBodyClosed != nil {
|
|
return 0, errStopReqBodyWrite
|
|
}
|
|
select {
|
|
case <-cs.abort:
|
|
return 0, cs.abortErr
|
|
case <-ctx.Done():
|
|
return 0, ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return 0, errRequestCanceled
|
|
default:
|
|
}
|
|
if a := cs.flow.available(); a > 0 {
|
|
take := a
|
|
if int(take) > maxBytes {
|
|
|
|
take = int32(maxBytes) // can't truncate int; take is int32
|
|
}
|
|
if take > int32(cc.maxFrameSize) {
|
|
take = int32(cc.maxFrameSize)
|
|
}
|
|
cs.flow.take(take)
|
|
return take, nil
|
|
}
|
|
cc.cond.Wait()
|
|
}
|
|
}
|
|
|
|
// requires cc.wmu be held.
|
|
func (cc *ClientConn) encodeTrailers(trailer http.Header) ([]byte, error) {
|
|
cc.hbuf.Reset()
|
|
|
|
hlSize := uint64(0)
|
|
for k, vv := range trailer {
|
|
for _, v := range vv {
|
|
hf := hpack.HeaderField{Name: k, Value: v}
|
|
hlSize += uint64(hf.Size())
|
|
}
|
|
}
|
|
if hlSize > cc.peerMaxHeaderListSize {
|
|
return nil, errRequestHeaderListSize
|
|
}
|
|
|
|
for k, vv := range trailer {
|
|
lowKey, ascii := httpcommon.LowerHeader(k)
|
|
if !ascii {
|
|
// Skip writing invalid headers. Per RFC 7540, Section 8.1.2, header
|
|
// field names have to be ASCII characters (just as in HTTP/1.x).
|
|
continue
|
|
}
|
|
// Transfer-Encoding, etc.. have already been filtered at the
|
|
// start of RoundTrip
|
|
for _, v := range vv {
|
|
cc.writeHeader(lowKey, v)
|
|
}
|
|
}
|
|
return cc.hbuf.Bytes(), nil
|
|
}
|
|
|
|
func (cc *ClientConn) writeHeader(name, value string) {
|
|
if VerboseLogs {
|
|
log.Printf("http2: Transport encoding header %q = %q", name, value)
|
|
}
|
|
cc.henc.WriteField(hpack.HeaderField{Name: name, Value: value})
|
|
}
|
|
|
|
type resAndError struct {
|
|
_ incomparable
|
|
res *http.Response
|
|
err error
|
|
}
|
|
|
|
// requires cc.mu be held.
|
|
func (cc *ClientConn) addStreamLocked(cs *clientStream) {
|
|
cs.flow.add(int32(cc.initialWindowSize))
|
|
cs.flow.setConnFlow(&cc.flow)
|
|
cs.inflow.init(cc.initialStreamRecvWindowSize)
|
|
cs.ID = cc.nextStreamID
|
|
cc.nextStreamID += 2
|
|
cc.streams[cs.ID] = cs
|
|
if cs.ID == 0 {
|
|
panic("assigned stream ID 0")
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) forgetStreamID(id uint32) {
|
|
cc.mu.Lock()
|
|
slen := len(cc.streams)
|
|
delete(cc.streams, id)
|
|
if len(cc.streams) != slen-1 {
|
|
panic("forgetting unknown stream id")
|
|
}
|
|
cc.lastActive = cc.t.now()
|
|
if len(cc.streams) == 0 && cc.idleTimer != nil {
|
|
cc.idleTimer.Reset(cc.idleTimeout)
|
|
cc.lastIdle = cc.t.now()
|
|
}
|
|
// Wake up writeRequestBody via clientStream.awaitFlowControl and
|
|
// wake up RoundTrip if there is a pending request.
|
|
cc.cond.Broadcast()
|
|
|
|
closeOnIdle := cc.singleUse || cc.doNotReuse || cc.t.disableKeepAlives() || cc.goAway != nil
|
|
if closeOnIdle && cc.streamsReserved == 0 && len(cc.streams) == 0 {
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport closing idle conn %p (forSingleUse=%v, maxStream=%v)", cc, cc.singleUse, cc.nextStreamID-2)
|
|
}
|
|
cc.closed = true
|
|
defer cc.closeConn()
|
|
}
|
|
|
|
cc.mu.Unlock()
|
|
}
|
|
|
|
// clientConnReadLoop is the state owned by the clientConn's frame-reading readLoop.
|
|
type clientConnReadLoop struct {
|
|
_ incomparable
|
|
cc *ClientConn
|
|
}
|
|
|
|
// readLoop runs in its own goroutine and reads and dispatches frames.
|
|
func (cc *ClientConn) readLoop() {
|
|
cc.t.markNewGoroutine()
|
|
rl := &clientConnReadLoop{cc: cc}
|
|
defer rl.cleanup()
|
|
cc.readerErr = rl.run()
|
|
if ce, ok := cc.readerErr.(ConnectionError); ok {
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteGoAway(0, ErrCode(ce), nil)
|
|
cc.wmu.Unlock()
|
|
}
|
|
}
|
|
|
|
// GoAwayError is returned by the Transport when the server closes the
|
|
// TCP connection after sending a GOAWAY frame.
|
|
type GoAwayError struct {
|
|
LastStreamID uint32
|
|
ErrCode ErrCode
|
|
DebugData string
|
|
}
|
|
|
|
func (e GoAwayError) Error() string {
|
|
return fmt.Sprintf("http2: server sent GOAWAY and closed the connection; LastStreamID=%v, ErrCode=%v, debug=%q",
|
|
e.LastStreamID, e.ErrCode, e.DebugData)
|
|
}
|
|
|
|
func isEOFOrNetReadError(err error) bool {
|
|
if err == io.EOF {
|
|
return true
|
|
}
|
|
ne, ok := err.(*net.OpError)
|
|
return ok && ne.Op == "read"
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) cleanup() {
|
|
cc := rl.cc
|
|
defer cc.closeConn()
|
|
defer close(cc.readerDone)
|
|
|
|
if cc.idleTimer != nil {
|
|
cc.idleTimer.Stop()
|
|
}
|
|
|
|
// Close any response bodies if the server closes prematurely.
|
|
// TODO: also do this if we've written the headers but not
|
|
// gotten a response yet.
|
|
err := cc.readerErr
|
|
cc.mu.Lock()
|
|
if cc.goAway != nil && isEOFOrNetReadError(err) {
|
|
err = GoAwayError{
|
|
LastStreamID: cc.goAway.LastStreamID,
|
|
ErrCode: cc.goAway.ErrCode,
|
|
DebugData: cc.goAwayDebug,
|
|
}
|
|
} else if err == io.EOF {
|
|
err = io.ErrUnexpectedEOF
|
|
}
|
|
cc.closed = true
|
|
|
|
// If the connection has never been used, and has been open for only a short time,
|
|
// leave it in the connection pool for a little while.
|
|
//
|
|
// This avoids a situation where new connections are constantly created,
|
|
// added to the pool, fail, and are removed from the pool, without any error
|
|
// being surfaced to the user.
|
|
unusedWaitTime := 5 * time.Second
|
|
if cc.idleTimeout > 0 && unusedWaitTime > cc.idleTimeout {
|
|
unusedWaitTime = cc.idleTimeout
|
|
}
|
|
idleTime := cc.t.now().Sub(cc.lastActive)
|
|
if atomic.LoadUint32(&cc.atomicReused) == 0 && idleTime < unusedWaitTime && !cc.closedOnIdle {
|
|
cc.idleTimer = cc.t.afterFunc(unusedWaitTime-idleTime, func() {
|
|
cc.t.connPool().MarkDead(cc)
|
|
})
|
|
} else {
|
|
cc.mu.Unlock() // avoid any deadlocks in MarkDead
|
|
cc.t.connPool().MarkDead(cc)
|
|
cc.mu.Lock()
|
|
}
|
|
|
|
for _, cs := range cc.streams {
|
|
select {
|
|
case <-cs.peerClosed:
|
|
// The server closed the stream before closing the conn,
|
|
// so no need to interrupt it.
|
|
default:
|
|
cs.abortStreamLocked(err)
|
|
}
|
|
}
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
|
|
if !cc.seenSettings {
|
|
// If we have a pending request that wants extended CONNECT,
|
|
// let it continue and fail with the connection error.
|
|
cc.extendedConnectAllowed = true
|
|
close(cc.seenSettingsChan)
|
|
}
|
|
}
|
|
|
|
// countReadFrameError calls Transport.CountError with a string
|
|
// representing err.
|
|
func (cc *ClientConn) countReadFrameError(err error) {
|
|
f := cc.t.CountError
|
|
if f == nil || err == nil {
|
|
return
|
|
}
|
|
if ce, ok := err.(ConnectionError); ok {
|
|
errCode := ErrCode(ce)
|
|
f(fmt.Sprintf("read_frame_conn_error_%s", errCode.stringToken()))
|
|
return
|
|
}
|
|
if errors.Is(err, io.EOF) {
|
|
f("read_frame_eof")
|
|
return
|
|
}
|
|
if errors.Is(err, io.ErrUnexpectedEOF) {
|
|
f("read_frame_unexpected_eof")
|
|
return
|
|
}
|
|
if errors.Is(err, ErrFrameTooLarge) {
|
|
f("read_frame_too_large")
|
|
return
|
|
}
|
|
f("read_frame_other")
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) run() error {
|
|
cc := rl.cc
|
|
gotSettings := false
|
|
readIdleTimeout := cc.readIdleTimeout
|
|
var t timer
|
|
if readIdleTimeout != 0 {
|
|
t = cc.t.afterFunc(readIdleTimeout, cc.healthCheck)
|
|
}
|
|
for {
|
|
f, err := cc.fr.ReadFrame()
|
|
if t != nil {
|
|
t.Reset(readIdleTimeout)
|
|
}
|
|
if err != nil {
|
|
cc.vlogf("http2: Transport readFrame error on conn %p: (%T) %v", cc, err, err)
|
|
}
|
|
if se, ok := err.(StreamError); ok {
|
|
if cs := rl.streamByID(se.StreamID, notHeaderOrDataFrame); cs != nil {
|
|
if se.Cause == nil {
|
|
se.Cause = cc.fr.errDetail
|
|
}
|
|
rl.endStreamError(cs, se)
|
|
}
|
|
continue
|
|
} else if err != nil {
|
|
cc.countReadFrameError(err)
|
|
return err
|
|
}
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport received %s", summarizeFrame(f))
|
|
}
|
|
if !gotSettings {
|
|
if _, ok := f.(*SettingsFrame); !ok {
|
|
cc.logf("protocol error: received %T before a SETTINGS frame", f)
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
gotSettings = true
|
|
}
|
|
|
|
switch f := f.(type) {
|
|
case *MetaHeadersFrame:
|
|
err = rl.processHeaders(f)
|
|
case *DataFrame:
|
|
err = rl.processData(f)
|
|
case *GoAwayFrame:
|
|
err = rl.processGoAway(f)
|
|
case *RSTStreamFrame:
|
|
err = rl.processResetStream(f)
|
|
case *SettingsFrame:
|
|
err = rl.processSettings(f)
|
|
case *PushPromiseFrame:
|
|
err = rl.processPushPromise(f)
|
|
case *WindowUpdateFrame:
|
|
err = rl.processWindowUpdate(f)
|
|
case *PingFrame:
|
|
err = rl.processPing(f)
|
|
default:
|
|
cc.logf("Transport: unhandled response frame type %T", f)
|
|
}
|
|
if err != nil {
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport conn %p received error from processing frame %v: %v", cc, summarizeFrame(f), err)
|
|
}
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processHeaders(f *MetaHeadersFrame) error {
|
|
cs := rl.streamByID(f.StreamID, headerOrDataFrame)
|
|
if cs == nil {
|
|
// We'd get here if we canceled a request while the
|
|
// server had its response still in flight. So if this
|
|
// was just something we canceled, ignore it.
|
|
return nil
|
|
}
|
|
if cs.readClosed {
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
Cause: errors.New("protocol error: headers after END_STREAM"),
|
|
})
|
|
return nil
|
|
}
|
|
if !cs.firstByte {
|
|
if cs.trace != nil {
|
|
// TODO(bradfitz): move first response byte earlier,
|
|
// when we first read the 9 byte header, not waiting
|
|
// until all the HEADERS+CONTINUATION frames have been
|
|
// merged. This works for now.
|
|
traceFirstResponseByte(cs.trace)
|
|
}
|
|
cs.firstByte = true
|
|
}
|
|
if !cs.pastHeaders {
|
|
cs.pastHeaders = true
|
|
} else {
|
|
return rl.processTrailers(cs, f)
|
|
}
|
|
|
|
res, err := rl.handleResponse(cs, f)
|
|
if err != nil {
|
|
if _, ok := err.(ConnectionError); ok {
|
|
return err
|
|
}
|
|
// Any other error type is a stream error.
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
Cause: err,
|
|
})
|
|
return nil // return nil from process* funcs to keep conn alive
|
|
}
|
|
if res == nil {
|
|
// (nil, nil) special case. See handleResponse docs.
|
|
return nil
|
|
}
|
|
cs.resTrailer = &res.Trailer
|
|
cs.res = res
|
|
close(cs.respHeaderRecv)
|
|
if f.StreamEnded() {
|
|
rl.endStream(cs)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// may return error types nil, or ConnectionError. Any other error value
|
|
// is a StreamError of type ErrCodeProtocol. The returned error in that case
|
|
// is the detail.
|
|
//
|
|
// As a special case, handleResponse may return (nil, nil) to skip the
|
|
// frame (currently only used for 1xx responses).
|
|
func (rl *clientConnReadLoop) handleResponse(cs *clientStream, f *MetaHeadersFrame) (*http.Response, error) {
|
|
if f.Truncated {
|
|
return nil, errResponseHeaderListSize
|
|
}
|
|
|
|
status := f.PseudoValue("status")
|
|
if status == "" {
|
|
return nil, errors.New("malformed response from server: missing status pseudo header")
|
|
}
|
|
statusCode, err := strconv.Atoi(status)
|
|
if err != nil {
|
|
return nil, errors.New("malformed response from server: malformed non-numeric status pseudo header")
|
|
}
|
|
|
|
regularFields := f.RegularFields()
|
|
strs := make([]string, len(regularFields))
|
|
header := make(http.Header, len(regularFields))
|
|
res := &http.Response{
|
|
Proto: "HTTP/2.0",
|
|
ProtoMajor: 2,
|
|
Header: header,
|
|
StatusCode: statusCode,
|
|
Status: status + " " + http.StatusText(statusCode),
|
|
}
|
|
for _, hf := range regularFields {
|
|
key := httpcommon.CanonicalHeader(hf.Name)
|
|
if key == "Trailer" {
|
|
t := res.Trailer
|
|
if t == nil {
|
|
t = make(http.Header)
|
|
res.Trailer = t
|
|
}
|
|
foreachHeaderElement(hf.Value, func(v string) {
|
|
t[httpcommon.CanonicalHeader(v)] = nil
|
|
})
|
|
} else {
|
|
vv := header[key]
|
|
if vv == nil && len(strs) > 0 {
|
|
// More than likely this will be a single-element key.
|
|
// Most headers aren't multi-valued.
|
|
// Set the capacity on strs[0] to 1, so any future append
|
|
// won't extend the slice into the other strings.
|
|
vv, strs = strs[:1:1], strs[1:]
|
|
vv[0] = hf.Value
|
|
header[key] = vv
|
|
} else {
|
|
header[key] = append(vv, hf.Value)
|
|
}
|
|
}
|
|
}
|
|
|
|
if statusCode >= 100 && statusCode <= 199 {
|
|
if f.StreamEnded() {
|
|
return nil, errors.New("1xx informational response with END_STREAM flag")
|
|
}
|
|
if fn := cs.get1xxTraceFunc(); fn != nil {
|
|
// If the 1xx response is being delivered to the user,
|
|
// then they're responsible for limiting the number
|
|
// of responses.
|
|
if err := fn(statusCode, textproto.MIMEHeader(header)); err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
// If the user didn't examine the 1xx response, then we
|
|
// limit the size of all 1xx headers.
|
|
//
|
|
// This differs a bit from the HTTP/1 implementation, which
|
|
// limits the size of all 1xx headers plus the final response.
|
|
// Use the larger limit of MaxHeaderListSize and
|
|
// net/http.Transport.MaxResponseHeaderBytes.
|
|
limit := int64(cs.cc.t.maxHeaderListSize())
|
|
if t1 := cs.cc.t.t1; t1 != nil && t1.MaxResponseHeaderBytes > limit {
|
|
limit = t1.MaxResponseHeaderBytes
|
|
}
|
|
for _, h := range f.Fields {
|
|
cs.totalHeaderSize += int64(h.Size())
|
|
}
|
|
if cs.totalHeaderSize > limit {
|
|
if VerboseLogs {
|
|
log.Printf("http2: 1xx informational responses too large")
|
|
}
|
|
return nil, errors.New("header list too large")
|
|
}
|
|
}
|
|
if statusCode == 100 {
|
|
traceGot100Continue(cs.trace)
|
|
select {
|
|
case cs.on100 <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
cs.pastHeaders = false // do it all again
|
|
return nil, nil
|
|
}
|
|
|
|
res.ContentLength = -1
|
|
if clens := res.Header["Content-Length"]; len(clens) == 1 {
|
|
if cl, err := strconv.ParseUint(clens[0], 10, 63); err == nil {
|
|
res.ContentLength = int64(cl)
|
|
} else {
|
|
// TODO: care? unlike http/1, it won't mess up our framing, so it's
|
|
// more safe smuggling-wise to ignore.
|
|
}
|
|
} else if len(clens) > 1 {
|
|
// TODO: care? unlike http/1, it won't mess up our framing, so it's
|
|
// more safe smuggling-wise to ignore.
|
|
} else if f.StreamEnded() && !cs.isHead {
|
|
res.ContentLength = 0
|
|
}
|
|
|
|
if cs.isHead {
|
|
res.Body = noBody
|
|
return res, nil
|
|
}
|
|
|
|
if f.StreamEnded() {
|
|
if res.ContentLength > 0 {
|
|
res.Body = missingBody{}
|
|
} else {
|
|
res.Body = noBody
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
cs.bufPipe.setBuffer(&dataBuffer{expected: res.ContentLength})
|
|
cs.bytesRemain = res.ContentLength
|
|
res.Body = transportResponseBody{cs}
|
|
|
|
if cs.requestedGzip && asciiEqualFold(res.Header.Get("Content-Encoding"), "gzip") {
|
|
res.Header.Del("Content-Encoding")
|
|
res.Header.Del("Content-Length")
|
|
res.ContentLength = -1
|
|
res.Body = &gzipReader{body: res.Body}
|
|
res.Uncompressed = true
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processTrailers(cs *clientStream, f *MetaHeadersFrame) error {
|
|
if cs.pastTrailers {
|
|
// Too many HEADERS frames for this stream.
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
cs.pastTrailers = true
|
|
if !f.StreamEnded() {
|
|
// We expect that any headers for trailers also
|
|
// has END_STREAM.
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
if len(f.PseudoFields()) > 0 {
|
|
// No pseudo header fields are defined for trailers.
|
|
// TODO: ConnectionError might be overly harsh? Check.
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
|
|
trailer := make(http.Header)
|
|
for _, hf := range f.RegularFields() {
|
|
key := httpcommon.CanonicalHeader(hf.Name)
|
|
trailer[key] = append(trailer[key], hf.Value)
|
|
}
|
|
cs.trailer = trailer
|
|
|
|
rl.endStream(cs)
|
|
return nil
|
|
}
|
|
|
|
// transportResponseBody is the concrete type of Transport.RoundTrip's
|
|
// Response.Body. It is an io.ReadCloser.
|
|
type transportResponseBody struct {
|
|
cs *clientStream
|
|
}
|
|
|
|
func (b transportResponseBody) Read(p []byte) (n int, err error) {
|
|
cs := b.cs
|
|
cc := cs.cc
|
|
|
|
if cs.readErr != nil {
|
|
return 0, cs.readErr
|
|
}
|
|
n, err = b.cs.bufPipe.Read(p)
|
|
if cs.bytesRemain != -1 {
|
|
if int64(n) > cs.bytesRemain {
|
|
n = int(cs.bytesRemain)
|
|
if err == nil {
|
|
err = errors.New("net/http: server replied with more than declared Content-Length; truncated")
|
|
cs.abortStream(err)
|
|
}
|
|
cs.readErr = err
|
|
return int(cs.bytesRemain), err
|
|
}
|
|
cs.bytesRemain -= int64(n)
|
|
if err == io.EOF && cs.bytesRemain > 0 {
|
|
err = io.ErrUnexpectedEOF
|
|
cs.readErr = err
|
|
return n, err
|
|
}
|
|
}
|
|
if n == 0 {
|
|
// No flow control tokens to send back.
|
|
return
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
connAdd := cc.inflow.add(n)
|
|
var streamAdd int32
|
|
if err == nil { // No need to refresh if the stream is over or failed.
|
|
streamAdd = cs.inflow.add(n)
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
if connAdd != 0 || streamAdd != 0 {
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if connAdd != 0 {
|
|
cc.fr.WriteWindowUpdate(0, mustUint31(connAdd))
|
|
}
|
|
if streamAdd != 0 {
|
|
cc.fr.WriteWindowUpdate(cs.ID, mustUint31(streamAdd))
|
|
}
|
|
cc.bw.Flush()
|
|
}
|
|
return
|
|
}
|
|
|
|
var errClosedResponseBody = errors.New("http2: response body closed")
|
|
|
|
func (b transportResponseBody) Close() error {
|
|
cs := b.cs
|
|
cc := cs.cc
|
|
|
|
cs.bufPipe.BreakWithError(errClosedResponseBody)
|
|
cs.abortStream(errClosedResponseBody)
|
|
|
|
unread := cs.bufPipe.Len()
|
|
if unread > 0 {
|
|
cc.mu.Lock()
|
|
// Return connection-level flow control.
|
|
connAdd := cc.inflow.add(unread)
|
|
cc.mu.Unlock()
|
|
|
|
// TODO(dneil): Acquiring this mutex can block indefinitely.
|
|
// Move flow control return to a goroutine?
|
|
cc.wmu.Lock()
|
|
// Return connection-level flow control.
|
|
if connAdd > 0 {
|
|
cc.fr.WriteWindowUpdate(0, uint32(connAdd))
|
|
}
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
|
|
select {
|
|
case <-cs.donec:
|
|
case <-cs.ctx.Done():
|
|
// See golang/go#49366: The net/http package can cancel the
|
|
// request context after the response body is fully read.
|
|
// Don't treat this as an error.
|
|
return nil
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processData(f *DataFrame) error {
|
|
cc := rl.cc
|
|
cs := rl.streamByID(f.StreamID, headerOrDataFrame)
|
|
data := f.Data()
|
|
if cs == nil {
|
|
cc.mu.Lock()
|
|
neverSent := cc.nextStreamID
|
|
cc.mu.Unlock()
|
|
if f.StreamID >= neverSent {
|
|
// We never asked for this.
|
|
cc.logf("http2: Transport received unsolicited DATA frame; closing connection")
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
// We probably did ask for this, but canceled. Just ignore it.
|
|
// TODO: be stricter here? only silently ignore things which
|
|
// we canceled, but not things which were closed normally
|
|
// by the peer? Tough without accumulating too much state.
|
|
|
|
// But at least return their flow control:
|
|
if f.Length > 0 {
|
|
cc.mu.Lock()
|
|
ok := cc.inflow.take(f.Length)
|
|
connAdd := cc.inflow.add(int(f.Length))
|
|
cc.mu.Unlock()
|
|
if !ok {
|
|
return ConnectionError(ErrCodeFlowControl)
|
|
}
|
|
if connAdd > 0 {
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteWindowUpdate(0, uint32(connAdd))
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
if cs.readClosed {
|
|
cc.logf("protocol error: received DATA after END_STREAM")
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
})
|
|
return nil
|
|
}
|
|
if !cs.pastHeaders {
|
|
cc.logf("protocol error: received DATA before a HEADERS frame")
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
})
|
|
return nil
|
|
}
|
|
if f.Length > 0 {
|
|
if cs.isHead && len(data) > 0 {
|
|
cc.logf("protocol error: received DATA on a HEAD request")
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
})
|
|
return nil
|
|
}
|
|
// Check connection-level flow control.
|
|
cc.mu.Lock()
|
|
if !takeInflows(&cc.inflow, &cs.inflow, f.Length) {
|
|
cc.mu.Unlock()
|
|
return ConnectionError(ErrCodeFlowControl)
|
|
}
|
|
// Return any padded flow control now, since we won't
|
|
// refund it later on body reads.
|
|
var refund int
|
|
if pad := int(f.Length) - len(data); pad > 0 {
|
|
refund += pad
|
|
}
|
|
|
|
didReset := false
|
|
var err error
|
|
if len(data) > 0 {
|
|
if _, err = cs.bufPipe.Write(data); err != nil {
|
|
// Return len(data) now if the stream is already closed,
|
|
// since data will never be read.
|
|
didReset = true
|
|
refund += len(data)
|
|
}
|
|
}
|
|
|
|
sendConn := cc.inflow.add(refund)
|
|
var sendStream int32
|
|
if !didReset {
|
|
sendStream = cs.inflow.add(refund)
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
if sendConn > 0 || sendStream > 0 {
|
|
cc.wmu.Lock()
|
|
if sendConn > 0 {
|
|
cc.fr.WriteWindowUpdate(0, uint32(sendConn))
|
|
}
|
|
if sendStream > 0 {
|
|
cc.fr.WriteWindowUpdate(cs.ID, uint32(sendStream))
|
|
}
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
|
|
if err != nil {
|
|
rl.endStreamError(cs, err)
|
|
return nil
|
|
}
|
|
}
|
|
|
|
if f.StreamEnded() {
|
|
rl.endStream(cs)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) endStream(cs *clientStream) {
|
|
// TODO: check that any declared content-length matches, like
|
|
// server.go's (*stream).endStream method.
|
|
if !cs.readClosed {
|
|
cs.readClosed = true
|
|
// Close cs.bufPipe and cs.peerClosed with cc.mu held to avoid a
|
|
// race condition: The caller can read io.EOF from Response.Body
|
|
// and close the body before we close cs.peerClosed, causing
|
|
// cleanupWriteRequest to send a RST_STREAM.
|
|
rl.cc.mu.Lock()
|
|
defer rl.cc.mu.Unlock()
|
|
cs.bufPipe.closeWithErrorAndCode(io.EOF, cs.copyTrailers)
|
|
close(cs.peerClosed)
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) endStreamError(cs *clientStream, err error) {
|
|
cs.readAborted = true
|
|
cs.abortStream(err)
|
|
}
|
|
|
|
// Constants passed to streamByID for documentation purposes.
|
|
const (
|
|
headerOrDataFrame = true
|
|
notHeaderOrDataFrame = false
|
|
)
|
|
|
|
// streamByID returns the stream with the given id, or nil if no stream has that id.
|
|
// If headerOrData is true, it clears rst.StreamPingsBlocked.
|
|
func (rl *clientConnReadLoop) streamByID(id uint32, headerOrData bool) *clientStream {
|
|
rl.cc.mu.Lock()
|
|
defer rl.cc.mu.Unlock()
|
|
if headerOrData {
|
|
// Work around an unfortunate gRPC behavior.
|
|
// See comment on ClientConn.rstStreamPingsBlocked for details.
|
|
rl.cc.rstStreamPingsBlocked = false
|
|
}
|
|
cs := rl.cc.streams[id]
|
|
if cs != nil && !cs.readAborted {
|
|
return cs
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (cs *clientStream) copyTrailers() {
|
|
for k, vv := range cs.trailer {
|
|
t := cs.resTrailer
|
|
if *t == nil {
|
|
*t = make(http.Header)
|
|
}
|
|
(*t)[k] = vv
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processGoAway(f *GoAwayFrame) error {
|
|
cc := rl.cc
|
|
cc.t.connPool().MarkDead(cc)
|
|
if f.ErrCode != 0 {
|
|
// TODO: deal with GOAWAY more. particularly the error code
|
|
cc.vlogf("transport got GOAWAY with error code = %v", f.ErrCode)
|
|
if fn := cc.t.CountError; fn != nil {
|
|
fn("recv_goaway_" + f.ErrCode.stringToken())
|
|
}
|
|
}
|
|
cc.setGoAway(f)
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processSettings(f *SettingsFrame) error {
|
|
cc := rl.cc
|
|
// Locking both mu and wmu here allows frame encoding to read settings with only wmu held.
|
|
// Acquiring wmu when f.IsAck() is unnecessary, but convenient and mostly harmless.
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
|
|
if err := rl.processSettingsNoWrite(f); err != nil {
|
|
return err
|
|
}
|
|
if !f.IsAck() {
|
|
cc.fr.WriteSettingsAck()
|
|
cc.bw.Flush()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processSettingsNoWrite(f *SettingsFrame) error {
|
|
cc := rl.cc
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
if f.IsAck() {
|
|
if cc.wantSettingsAck {
|
|
cc.wantSettingsAck = false
|
|
return nil
|
|
}
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
|
|
var seenMaxConcurrentStreams bool
|
|
err := f.ForeachSetting(func(s Setting) error {
|
|
switch s.ID {
|
|
case SettingMaxFrameSize:
|
|
cc.maxFrameSize = s.Val
|
|
case SettingMaxConcurrentStreams:
|
|
cc.maxConcurrentStreams = s.Val
|
|
seenMaxConcurrentStreams = true
|
|
case SettingMaxHeaderListSize:
|
|
cc.peerMaxHeaderListSize = uint64(s.Val)
|
|
case SettingInitialWindowSize:
|
|
// Values above the maximum flow-control
|
|
// window size of 2^31-1 MUST be treated as a
|
|
// connection error (Section 5.4.1) of type
|
|
// FLOW_CONTROL_ERROR.
|
|
if s.Val > math.MaxInt32 {
|
|
return ConnectionError(ErrCodeFlowControl)
|
|
}
|
|
|
|
// Adjust flow control of currently-open
|
|
// frames by the difference of the old initial
|
|
// window size and this one.
|
|
delta := int32(s.Val) - int32(cc.initialWindowSize)
|
|
for _, cs := range cc.streams {
|
|
cs.flow.add(delta)
|
|
}
|
|
cc.cond.Broadcast()
|
|
|
|
cc.initialWindowSize = s.Val
|
|
case SettingHeaderTableSize:
|
|
cc.henc.SetMaxDynamicTableSize(s.Val)
|
|
cc.peerMaxHeaderTableSize = s.Val
|
|
case SettingEnableConnectProtocol:
|
|
if err := s.Valid(); err != nil {
|
|
return err
|
|
}
|
|
// If the peer wants to send us SETTINGS_ENABLE_CONNECT_PROTOCOL,
|
|
// we require that it do so in the first SETTINGS frame.
|
|
//
|
|
// When we attempt to use extended CONNECT, we wait for the first
|
|
// SETTINGS frame to see if the server supports it. If we let the
|
|
// server enable the feature with a later SETTINGS frame, then
|
|
// users will see inconsistent results depending on whether we've
|
|
// seen that frame or not.
|
|
if !cc.seenSettings {
|
|
cc.extendedConnectAllowed = s.Val == 1
|
|
}
|
|
default:
|
|
cc.vlogf("Unhandled Setting: %v", s)
|
|
}
|
|
return nil
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !cc.seenSettings {
|
|
if !seenMaxConcurrentStreams {
|
|
// This was the servers initial SETTINGS frame and it
|
|
// didn't contain a MAX_CONCURRENT_STREAMS field so
|
|
// increase the number of concurrent streams this
|
|
// connection can establish to our default.
|
|
cc.maxConcurrentStreams = defaultMaxConcurrentStreams
|
|
}
|
|
close(cc.seenSettingsChan)
|
|
cc.seenSettings = true
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processWindowUpdate(f *WindowUpdateFrame) error {
|
|
cc := rl.cc
|
|
cs := rl.streamByID(f.StreamID, notHeaderOrDataFrame)
|
|
if f.StreamID != 0 && cs == nil {
|
|
return nil
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
fl := &cc.flow
|
|
if cs != nil {
|
|
fl = &cs.flow
|
|
}
|
|
if !fl.add(int32(f.Increment)) {
|
|
// For stream, the sender sends RST_STREAM with an error code of FLOW_CONTROL_ERROR
|
|
if cs != nil {
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeFlowControl,
|
|
})
|
|
return nil
|
|
}
|
|
|
|
return ConnectionError(ErrCodeFlowControl)
|
|
}
|
|
cc.cond.Broadcast()
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processResetStream(f *RSTStreamFrame) error {
|
|
cs := rl.streamByID(f.StreamID, notHeaderOrDataFrame)
|
|
if cs == nil {
|
|
// TODO: return error if server tries to RST_STREAM an idle stream
|
|
return nil
|
|
}
|
|
serr := streamError(cs.ID, f.ErrCode)
|
|
serr.Cause = errFromPeer
|
|
if f.ErrCode == ErrCodeProtocol {
|
|
rl.cc.SetDoNotReuse()
|
|
}
|
|
if fn := cs.cc.t.CountError; fn != nil {
|
|
fn("recv_rststream_" + f.ErrCode.stringToken())
|
|
}
|
|
cs.abortStream(serr)
|
|
|
|
cs.bufPipe.CloseWithError(serr)
|
|
return nil
|
|
}
|
|
|
|
// Ping sends a PING frame to the server and waits for the ack.
|
|
func (cc *ClientConn) Ping(ctx context.Context) error {
|
|
c := make(chan struct{})
|
|
// Generate a random payload
|
|
var p [8]byte
|
|
for {
|
|
if _, err := rand.Read(p[:]); err != nil {
|
|
return err
|
|
}
|
|
cc.mu.Lock()
|
|
// check for dup before insert
|
|
if _, found := cc.pings[p]; !found {
|
|
cc.pings[p] = c
|
|
cc.mu.Unlock()
|
|
break
|
|
}
|
|
cc.mu.Unlock()
|
|
}
|
|
var pingError error
|
|
errc := make(chan struct{})
|
|
go func() {
|
|
cc.t.markNewGoroutine()
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if pingError = cc.fr.WritePing(false, p); pingError != nil {
|
|
close(errc)
|
|
return
|
|
}
|
|
if pingError = cc.bw.Flush(); pingError != nil {
|
|
close(errc)
|
|
return
|
|
}
|
|
}()
|
|
select {
|
|
case <-c:
|
|
return nil
|
|
case <-errc:
|
|
return pingError
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cc.readerDone:
|
|
// connection closed
|
|
return cc.readerErr
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processPing(f *PingFrame) error {
|
|
if f.IsAck() {
|
|
cc := rl.cc
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
// If ack, notify listener if any
|
|
if c, ok := cc.pings[f.Data]; ok {
|
|
close(c)
|
|
delete(cc.pings, f.Data)
|
|
}
|
|
if cc.pendingResets > 0 {
|
|
// See clientStream.cleanupWriteRequest.
|
|
cc.pendingResets = 0
|
|
cc.rstStreamPingsBlocked = true
|
|
cc.cond.Broadcast()
|
|
}
|
|
return nil
|
|
}
|
|
cc := rl.cc
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if err := cc.fr.WritePing(true, f.Data); err != nil {
|
|
return err
|
|
}
|
|
return cc.bw.Flush()
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processPushPromise(f *PushPromiseFrame) error {
|
|
// We told the peer we don't want them.
|
|
// Spec says:
|
|
// "PUSH_PROMISE MUST NOT be sent if the SETTINGS_ENABLE_PUSH
|
|
// setting of the peer endpoint is set to 0. An endpoint that
|
|
// has set this setting and has received acknowledgement MUST
|
|
// treat the receipt of a PUSH_PROMISE frame as a connection
|
|
// error (Section 5.4.1) of type PROTOCOL_ERROR."
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
|
|
// writeStreamReset sends a RST_STREAM frame.
|
|
// When ping is true, it also sends a PING frame with a random payload.
|
|
func (cc *ClientConn) writeStreamReset(streamID uint32, code ErrCode, ping bool, err error) {
|
|
// TODO: map err to more interesting error codes, once the
|
|
// HTTP community comes up with some. But currently for
|
|
// RST_STREAM there's no equivalent to GOAWAY frame's debug
|
|
// data, and the error codes are all pretty vague ("cancel").
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteRSTStream(streamID, code)
|
|
if ping {
|
|
var payload [8]byte
|
|
rand.Read(payload[:])
|
|
cc.fr.WritePing(false, payload)
|
|
}
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
|
|
var (
|
|
errResponseHeaderListSize = errors.New("http2: response header list larger than advertised limit")
|
|
errRequestHeaderListSize = httpcommon.ErrRequestHeaderListSize
|
|
)
|
|
|
|
func (cc *ClientConn) logf(format string, args ...interface{}) {
|
|
cc.t.logf(format, args...)
|
|
}
|
|
|
|
func (cc *ClientConn) vlogf(format string, args ...interface{}) {
|
|
cc.t.vlogf(format, args...)
|
|
}
|
|
|
|
func (t *Transport) vlogf(format string, args ...interface{}) {
|
|
if VerboseLogs {
|
|
t.logf(format, args...)
|
|
}
|
|
}
|
|
|
|
func (t *Transport) logf(format string, args ...interface{}) {
|
|
log.Printf(format, args...)
|
|
}
|
|
|
|
var noBody io.ReadCloser = noBodyReader{}
|
|
|
|
type noBodyReader struct{}
|
|
|
|
func (noBodyReader) Close() error { return nil }
|
|
func (noBodyReader) Read([]byte) (int, error) { return 0, io.EOF }
|
|
|
|
type missingBody struct{}
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func (missingBody) Close() error { return nil }
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func (missingBody) Read([]byte) (int, error) { return 0, io.ErrUnexpectedEOF }
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func strSliceContains(ss []string, s string) bool {
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for _, v := range ss {
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if v == s {
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return true
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}
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}
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return false
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}
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type erringRoundTripper struct{ err error }
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func (rt erringRoundTripper) RoundTripErr() error { return rt.err }
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func (rt erringRoundTripper) RoundTrip(*http.Request) (*http.Response, error) { return nil, rt.err }
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// gzipReader wraps a response body so it can lazily
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// call gzip.NewReader on the first call to Read
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type gzipReader struct {
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_ incomparable
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body io.ReadCloser // underlying Response.Body
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zr *gzip.Reader // lazily-initialized gzip reader
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zerr error // sticky error
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}
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func (gz *gzipReader) Read(p []byte) (n int, err error) {
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if gz.zerr != nil {
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return 0, gz.zerr
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}
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if gz.zr == nil {
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gz.zr, err = gzip.NewReader(gz.body)
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if err != nil {
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gz.zerr = err
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return 0, err
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}
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}
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return gz.zr.Read(p)
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}
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func (gz *gzipReader) Close() error {
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if err := gz.body.Close(); err != nil {
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return err
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}
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gz.zerr = fs.ErrClosed
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return nil
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}
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type errorReader struct{ err error }
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func (r errorReader) Read(p []byte) (int, error) { return 0, r.err }
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// isConnectionCloseRequest reports whether req should use its own
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// connection for a single request and then close the connection.
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func isConnectionCloseRequest(req *http.Request) bool {
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return req.Close || httpguts.HeaderValuesContainsToken(req.Header["Connection"], "close")
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}
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// registerHTTPSProtocol calls Transport.RegisterProtocol but
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// converting panics into errors.
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func registerHTTPSProtocol(t *http.Transport, rt noDialH2RoundTripper) (err error) {
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defer func() {
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if e := recover(); e != nil {
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err = fmt.Errorf("%v", e)
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}
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}()
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t.RegisterProtocol("https", rt)
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return nil
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}
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// noDialH2RoundTripper is a RoundTripper which only tries to complete the request
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// if there's already has a cached connection to the host.
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// (The field is exported so it can be accessed via reflect from net/http; tested
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// by TestNoDialH2RoundTripperType)
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type noDialH2RoundTripper struct{ *Transport }
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func (rt noDialH2RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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res, err := rt.Transport.RoundTrip(req)
|
|
if isNoCachedConnError(err) {
|
|
return nil, http.ErrSkipAltProtocol
|
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}
|
|
return res, err
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}
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|
|
func (t *Transport) idleConnTimeout() time.Duration {
|
|
// to keep things backwards compatible, we use non-zero values of
|
|
// IdleConnTimeout, followed by using the IdleConnTimeout on the underlying
|
|
// http1 transport, followed by 0
|
|
if t.IdleConnTimeout != 0 {
|
|
return t.IdleConnTimeout
|
|
}
|
|
|
|
if t.t1 != nil {
|
|
return t.t1.IdleConnTimeout
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|
}
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|
|
return 0
|
|
}
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|
|
func traceGetConn(req *http.Request, hostPort string) {
|
|
trace := httptrace.ContextClientTrace(req.Context())
|
|
if trace == nil || trace.GetConn == nil {
|
|
return
|
|
}
|
|
trace.GetConn(hostPort)
|
|
}
|
|
|
|
func traceGotConn(req *http.Request, cc *ClientConn, reused bool) {
|
|
trace := httptrace.ContextClientTrace(req.Context())
|
|
if trace == nil || trace.GotConn == nil {
|
|
return
|
|
}
|
|
ci := httptrace.GotConnInfo{Conn: cc.tconn}
|
|
ci.Reused = reused
|
|
cc.mu.Lock()
|
|
ci.WasIdle = len(cc.streams) == 0 && reused
|
|
if ci.WasIdle && !cc.lastActive.IsZero() {
|
|
ci.IdleTime = cc.t.timeSince(cc.lastActive)
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
trace.GotConn(ci)
|
|
}
|
|
|
|
func traceWroteHeaders(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.WroteHeaders != nil {
|
|
trace.WroteHeaders()
|
|
}
|
|
}
|
|
|
|
func traceGot100Continue(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.Got100Continue != nil {
|
|
trace.Got100Continue()
|
|
}
|
|
}
|
|
|
|
func traceWait100Continue(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.Wait100Continue != nil {
|
|
trace.Wait100Continue()
|
|
}
|
|
}
|
|
|
|
func traceWroteRequest(trace *httptrace.ClientTrace, err error) {
|
|
if trace != nil && trace.WroteRequest != nil {
|
|
trace.WroteRequest(httptrace.WroteRequestInfo{Err: err})
|
|
}
|
|
}
|
|
|
|
func traceFirstResponseByte(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.GotFirstResponseByte != nil {
|
|
trace.GotFirstResponseByte()
|
|
}
|
|
}
|
|
|
|
func traceGot1xxResponseFunc(trace *httptrace.ClientTrace) func(int, textproto.MIMEHeader) error {
|
|
if trace != nil {
|
|
return trace.Got1xxResponse
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// dialTLSWithContext uses tls.Dialer, added in Go 1.15, to open a TLS
|
|
// connection.
|
|
func (t *Transport) dialTLSWithContext(ctx context.Context, network, addr string, cfg *tls.Config) (*tls.Conn, error) {
|
|
dialer := &tls.Dialer{
|
|
Config: cfg,
|
|
}
|
|
cn, err := dialer.DialContext(ctx, network, addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tlsCn := cn.(*tls.Conn) // DialContext comment promises this will always succeed
|
|
return tlsCn, nil
|
|
}
|