traefik/vendor/google.golang.org/grpc/keepalive/keepalive.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");
* you may not use this file except in compliance with the License.
* 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
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*
*/
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// Package keepalive defines configurable parameters for point-to-point
// healthcheck.
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package keepalive
import (
"time"
)
// 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 and send pings so intermediaries will be aware of the
// liveness of the connection. Make sure these parameters are set in
// coordination with the keepalive policy on the server, 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.
// If set below 10s, a minimum value of 10s will be used instead.
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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 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 sends keepalive pings even with no active RPCs. If false,
// when there are no active RPCs, Time and Timeout will be ignored and no
// keepalive pings will be sent.
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PermitWithoutStream bool // false by default.
}
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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. 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. 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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// MaxConnectionAgeGrace 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.
// 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
// of Timeout and if no activity is seen even after that the connection is
// closed.
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Timeout time.Duration // The current default value is 20 seconds.
}
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// EnforcementPolicy is used to set keepalive enforcement policy on the
// server-side. 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 allows keepalive pings even when there are no active
// streams(RPCs). If false, and client sends ping when there are no active
// streams, server will send GOAWAY and close the connection.
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PermitWithoutStream bool // false by default.
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}