1 // Copyright 2017 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package clientv3 16 17 import ( 18 "math" 19 "time" 20 21 "google.golang.org/grpc" 22 ) 23 24 var ( 25 // client-side handling retrying of request failures where data was not written to the wire or 26 // where server indicates it did not process the data. gRPC default is default is "WaitForReady(false)" 27 // but for etcd we default to "WaitForReady(true)" to minimize client request error responses due to 28 // transient failures. 29 defaultWaitForReady = grpc.WaitForReady(true) 30 31 // client-side request send limit, gRPC default is math.MaxInt32 32 // Make sure that "client-side send limit < server-side default send/recv limit" 33 // Same value as "embed.DefaultMaxRequestBytes" plus gRPC overhead bytes 34 defaultMaxCallSendMsgSize = grpc.MaxCallSendMsgSize(2 * 1024 * 1024) 35 36 // client-side response receive limit, gRPC default is 4MB 37 // Make sure that "client-side receive limit >= server-side default send/recv limit" 38 // because range response can easily exceed request send limits 39 // Default to math.MaxInt32; writes exceeding server-side send limit fails anyway 40 defaultMaxCallRecvMsgSize = grpc.MaxCallRecvMsgSize(math.MaxInt32) 41 42 // client-side non-streaming retry limit, only applied to requests where server responds with 43 // a error code clearly indicating it was unable to process the request such as codes.Unavailable. 44 // If set to 0, retry is disabled. 45 defaultUnaryMaxRetries uint = 100 46 47 // client-side streaming retry limit, only applied to requests where server responds with 48 // a error code clearly indicating it was unable to process the request such as codes.Unavailable. 49 // If set to 0, retry is disabled. 50 defaultStreamMaxRetries = ^uint(0) // max uint 51 52 // client-side retry backoff wait between requests. 53 defaultBackoffWaitBetween = 25 * time.Millisecond 54 55 // client-side retry backoff default jitter fraction. 56 defaultBackoffJitterFraction = 0.10 57 ) 58 59 // defaultCallOpts defines a list of default "gRPC.CallOption". 60 // Some options are exposed to "clientv3.Config". 61 // Defaults will be overridden by the settings in "clientv3.Config". 62 var defaultCallOpts = []grpc.CallOption{ 63 defaultWaitForReady, 64 defaultMaxCallSendMsgSize, 65 defaultMaxCallRecvMsgSize, 66 } 67 68 // MaxLeaseTTL is the maximum lease TTL value 69 const MaxLeaseTTL = 9000000000 70