forked from toolshed/abra
100 lines
4.4 KiB
Go
100 lines
4.4 KiB
Go
/*
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*
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* Copyright 2017 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 keepalive defines configurable parameters for point-to-point
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// healthcheck.
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package keepalive
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import (
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"time"
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)
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// ClientParameters is used to set keepalive parameters on the client-side.
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// These configure how the client will actively probe to notice when a
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// connection is broken and send pings so intermediaries will be aware of the
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// liveness of the connection. Make sure these parameters are set in
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// coordination with the keepalive policy on the server, as incompatible
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// settings can result in closing of connection.
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type ClientParameters struct {
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// After a duration of this time if the client doesn't see any activity it
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// pings the server to see if the transport is still alive.
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// If set below 10s, a minimum value of 10s will be used instead.
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//
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// Note that gRPC servers have a default EnforcementPolicy.MinTime of 5
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// minutes (which means the client shouldn't ping more frequently than every
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// 5 minutes).
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//
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// Though not ideal, it's not a strong requirement for Time to be less than
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// EnforcementPolicy.MinTime. Time will automatically double if the server
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// disconnects due to its enforcement policy.
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//
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// For more details, see
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// https://github.com/grpc/proposal/blob/master/A8-client-side-keepalive.md
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Time time.Duration
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// After having pinged for keepalive check, the client waits for a duration
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// of Timeout and if no activity is seen even after that the connection is
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// closed.
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//
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// If keepalive is enabled, and this value is not explicitly set, the default
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// is 20 seconds.
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Timeout time.Duration
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// If true, client sends keepalive pings even with no active RPCs. If false,
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// when there are no active RPCs, Time and Timeout will be ignored and no
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// keepalive pings will be sent.
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PermitWithoutStream bool
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}
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// ServerParameters is used to set keepalive and max-age parameters on the
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// server-side.
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type ServerParameters struct {
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// MaxConnectionIdle is a duration for the amount of time after which an
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// idle connection would be closed by sending a GoAway. Idleness duration is
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// defined since the most recent time the number of outstanding RPCs became
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// zero or the connection establishment.
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MaxConnectionIdle time.Duration // The current default value is infinity.
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// MaxConnectionAge is a duration for the maximum amount of time a
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// connection may exist before it will be closed by sending a GoAway. A
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// random jitter of +/-10% will be added to MaxConnectionAge to spread out
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// connection storms.
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MaxConnectionAge time.Duration // The current default value is infinity.
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// MaxConnectionAgeGrace is an additive period after MaxConnectionAge after
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// which the connection will be forcibly closed.
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MaxConnectionAgeGrace time.Duration // The current default value is infinity.
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// After a duration of this time if the server doesn't see any activity it
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// pings the client to see if the transport is still alive.
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// If set below 1s, a minimum value of 1s will be used instead.
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Time time.Duration // The current default value is 2 hours.
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// After having pinged for keepalive check, the server waits for a duration
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// of Timeout and if no activity is seen even after that the connection is
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// closed.
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Timeout time.Duration // The current default value is 20 seconds.
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}
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// EnforcementPolicy is used to set keepalive enforcement policy on the
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// server-side. Server will close connection with a client that violates this
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// policy.
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type EnforcementPolicy struct {
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// MinTime is the minimum amount of time a client should wait before sending
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// a keepalive ping.
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MinTime time.Duration // The current default value is 5 minutes.
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// If true, server allows keepalive pings even when there are no active
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// streams(RPCs). If false, and client sends ping when there are no active
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// streams, server will send GOAWAY and close the connection.
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PermitWithoutStream bool // false by default.
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}
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