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Girish Gowdra64503432020-01-07 10:59:10 +05301/*
2 *
3 * Copyright 2017 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19// Package keepalive defines configurable parameters for point-to-point
20// healthcheck.
21package keepalive
22
23import (
24 "time"
25)
26
27// ClientParameters is used to set keepalive parameters on the client-side.
28// These configure how the client will actively probe to notice when a
29// connection is broken and send pings so intermediaries will be aware of the
30// liveness of the connection. Make sure these parameters are set in
31// coordination with the keepalive policy on the server, as incompatible
32// settings can result in closing of connection.
33type ClientParameters struct {
34 // After a duration of this time if the client doesn't see any activity it
35 // pings the server to see if the transport is still alive.
36 // If set below 10s, a minimum value of 10s will be used instead.
37 Time time.Duration // The current default value is infinity.
38 // After having pinged for keepalive check, the client waits for a duration
39 // of Timeout and if no activity is seen even after that the connection is
40 // closed.
41 Timeout time.Duration // The current default value is 20 seconds.
42 // If true, client sends keepalive pings even with no active RPCs. If false,
43 // when there are no active RPCs, Time and Timeout will be ignored and no
44 // keepalive pings will be sent.
45 PermitWithoutStream bool // false by default.
46}
47
48// ServerParameters is used to set keepalive and max-age parameters on the
49// server-side.
50type ServerParameters struct {
51 // MaxConnectionIdle is a duration for the amount of time after which an
52 // idle connection would be closed by sending a GoAway. Idleness duration is
53 // defined since the most recent time the number of outstanding RPCs became
54 // zero or the connection establishment.
55 MaxConnectionIdle time.Duration // The current default value is infinity.
56 // MaxConnectionAge is a duration for the maximum amount of time a
57 // connection may exist before it will be closed by sending a GoAway. A
58 // random jitter of +/-10% will be added to MaxConnectionAge to spread out
59 // connection storms.
60 MaxConnectionAge time.Duration // The current default value is infinity.
61 // MaxConnectionAgeGrace is an additive period after MaxConnectionAge after
62 // which the connection will be forcibly closed.
63 MaxConnectionAgeGrace time.Duration // The current default value is infinity.
64 // After a duration of this time if the server doesn't see any activity it
65 // pings the client to see if the transport is still alive.
66 // If set below 1s, a minimum value of 1s will be used instead.
67 Time time.Duration // The current default value is 2 hours.
68 // After having pinged for keepalive check, the server waits for a duration
69 // of Timeout and if no activity is seen even after that the connection is
70 // closed.
71 Timeout time.Duration // The current default value is 20 seconds.
72}
73
74// EnforcementPolicy is used to set keepalive enforcement policy on the
75// server-side. Server will close connection with a client that violates this
76// policy.
77type EnforcementPolicy struct {
78 // MinTime is the minimum amount of time a client should wait before sending
79 // a keepalive ping.
80 MinTime time.Duration // The current default value is 5 minutes.
81 // If true, server allows keepalive pings even when there are no active
82 // streams(RPCs). If false, and client sends ping when there are no active
83 // streams, server will send GOAWAY and close the connection.
84 PermitWithoutStream bool // false by default.
85}