forked from toolshed/abra
96 lines
4.1 KiB
Go
96 lines
4.1 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package envconfig contains grpc settings configured by environment variables.
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package envconfig
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import (
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"os"
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"strconv"
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"strings"
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)
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var (
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// TXTErrIgnore is set if TXT errors should be ignored ("GRPC_GO_IGNORE_TXT_ERRORS" is not "false").
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TXTErrIgnore = boolFromEnv("GRPC_GO_IGNORE_TXT_ERRORS", true)
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// RingHashCap indicates the maximum ring size which defaults to 4096
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// entries but may be overridden by setting the environment variable
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// "GRPC_RING_HASH_CAP". This does not override the default bounds
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// checking which NACKs configs specifying ring sizes > 8*1024*1024 (~8M).
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RingHashCap = uint64FromEnv("GRPC_RING_HASH_CAP", 4096, 1, 8*1024*1024)
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// ALTSMaxConcurrentHandshakes is the maximum number of concurrent ALTS
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// handshakes that can be performed.
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ALTSMaxConcurrentHandshakes = uint64FromEnv("GRPC_ALTS_MAX_CONCURRENT_HANDSHAKES", 100, 1, 100)
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// EnforceALPNEnabled is set if TLS connections to servers with ALPN disabled
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// should be rejected. The HTTP/2 protocol requires ALPN to be enabled, this
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// option is present for backward compatibility. This option may be overridden
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// by setting the environment variable "GRPC_ENFORCE_ALPN_ENABLED" to "true"
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// or "false".
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EnforceALPNEnabled = boolFromEnv("GRPC_ENFORCE_ALPN_ENABLED", true)
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// XDSFallbackSupport is the env variable that controls whether support for
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// xDS fallback is turned on. If this is unset or is false, only the first
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// xDS server in the list of server configs will be used.
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XDSFallbackSupport = boolFromEnv("GRPC_EXPERIMENTAL_XDS_FALLBACK", true)
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// NewPickFirstEnabled is set if the new pickfirst leaf policy is to be used
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// instead of the exiting pickfirst implementation. This can be disabled by
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// setting the environment variable "GRPC_EXPERIMENTAL_ENABLE_NEW_PICK_FIRST"
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// to "false".
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NewPickFirstEnabled = boolFromEnv("GRPC_EXPERIMENTAL_ENABLE_NEW_PICK_FIRST", true)
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// XDSEndpointHashKeyBackwardCompat controls the parsing of the endpoint hash
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// key from EDS LbEndpoint metadata. Endpoint hash keys can be disabled by
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// setting "GRPC_XDS_ENDPOINT_HASH_KEY_BACKWARD_COMPAT" to "true". When the
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// implementation of A76 is stable, we will flip the default value to false
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// in a subsequent release. A final release will remove this environment
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// variable, enabling the new behavior unconditionally.
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XDSEndpointHashKeyBackwardCompat = boolFromEnv("GRPC_XDS_ENDPOINT_HASH_KEY_BACKWARD_COMPAT", true)
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// RingHashSetRequestHashKey is set if the ring hash balancer can get the
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// request hash header by setting the "requestHashHeader" field, according
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// to gRFC A76. It can be enabled by setting the environment variable
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// "GRPC_EXPERIMENTAL_RING_HASH_SET_REQUEST_HASH_KEY" to "true".
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RingHashSetRequestHashKey = boolFromEnv("GRPC_EXPERIMENTAL_RING_HASH_SET_REQUEST_HASH_KEY", false)
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// ALTSHandshakerKeepaliveParams is set if we should add the
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// KeepaliveParams when dial the ALTS handshaker service.
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ALTSHandshakerKeepaliveParams = boolFromEnv("GRPC_EXPERIMENTAL_ALTS_HANDSHAKER_KEEPALIVE_PARAMS", false)
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)
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func boolFromEnv(envVar string, def bool) bool {
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if def {
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// The default is true; return true unless the variable is "false".
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return !strings.EqualFold(os.Getenv(envVar), "false")
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}
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// The default is false; return false unless the variable is "true".
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return strings.EqualFold(os.Getenv(envVar), "true")
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}
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func uint64FromEnv(envVar string, def, min, max uint64) uint64 {
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v, err := strconv.ParseUint(os.Getenv(envVar), 10, 64)
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if err != nil {
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return def
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}
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if v < min {
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return min
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}
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if v > max {
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return max
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}
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return v
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}
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