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80 lines
4.4 KiB
80 lines
4.4 KiB
/*
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*
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* Copyright 2017, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 broken
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// and to cause activity so intermediaries are aware the connection is still in use.
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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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