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 19 package transport
20 21 import (
22 "math"
23 "time"
24 )
25 26 const (
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.
55 var MaxStreamID = uint32(math.MaxInt32 * 3 / 4)
56