66 строки
3.5 KiB
Go
66 строки
3.5 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 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 connection is broken
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// and send pings so intermediaries will be aware of the liveness of the connection.
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// Make sure these parameters are set in coordination with the keepalive policy on the server,
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// as incompatible 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 pings the server to see if the transport is still alive.
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Time time.Duration // The current default value is infinity.
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// After having pinged for keepalive check, the client waits for a duration of Timeout and if no activity is seen even after that
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// the connection is closed.
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Timeout time.Duration // The current default value is 20 seconds.
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// If true, client runs keepalive checks even with no active RPCs.
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PermitWithoutStream bool // false by default.
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}
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// ServerParameters is used to set keepalive and max-age parameters on the 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 idle connection would be closed by sending a GoAway.
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// Idleness duration is defined since the most recent time the number of outstanding RPCs became 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 connection may exist before it will be closed by sending a GoAway.
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// A random jitter of +/-10% will be added to MaxConnectionAge to spread out connection storms.
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MaxConnectionAge time.Duration // The current default value is infinity.
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// MaxConnectinoAgeGrace is an additive period after MaxConnectionAge after 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 pings the client to see if the transport is still alive.
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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 of Timeout and if no activity is seen even after that
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// the connection is 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 server-side.
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// Server will close connection with a client that violates this 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 a keepalive ping.
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MinTime time.Duration // The current default value is 5 minutes.
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// If true, server expects keepalive pings even when there are no active streams(RPCs).
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PermitWithoutStream bool // false by default.
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}
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