1/*
 2 *
 3 * Copyright 2018 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
19package transport
20
21import (
22	"math"
23	"time"
24)
25
26const (
27	// The default value of flow control window size in HTTP2 spec.
28	defaultWindowSize = 65535
29	// The initial window size for flow control.
30	initialWindowSize             = defaultWindowSize // for an RPC
31	infinity                      = time.Duration(math.MaxInt64)
32	defaultClientKeepaliveTime    = infinity
33	defaultClientKeepaliveTimeout = 20 * time.Second
34	defaultMaxStreamsClient       = 100
35	defaultMaxConnectionIdle      = infinity
36	defaultMaxConnectionAge       = infinity
37	defaultMaxConnectionAgeGrace  = infinity
38	defaultServerKeepaliveTime    = 2 * time.Hour
39	defaultServerKeepaliveTimeout = 20 * time.Second
40	defaultKeepalivePolicyMinTime = 5 * time.Minute
41	// max window limit set by HTTP2 Specs.
42	maxWindowSize = math.MaxInt32
43	// defaultWriteQuota is the default value for number of data
44	// bytes that each stream can schedule before some of it being
45	// flushed out.
46	defaultWriteQuota              = 64 * 1024
47	defaultClientMaxHeaderListSize = uint32(16 << 20)
48	defaultServerMaxHeaderListSize = uint32(16 << 20)
49)
50
51// MaxStreamID is the upper bound for the stream ID before the current
52// transport gracefully closes and new transport is created for subsequent RPCs.
53// This is set to 75% of 2^31-1. Streams are identified with an unsigned 31-bit
54// integer. It's exported so that tests can override it.
55var MaxStreamID = uint32(math.MaxInt32 * 3 / 4)