cubefs
74 строки · 2.4 Кб
1/*
2*
3* Copyright 2014 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 grpc
20
21import (
22"context"
23)
24
25// Invoke sends the RPC request on the wire and returns after response is
26// received. This is typically called by generated code.
27//
28// All errors returned by Invoke are compatible with the status package.
29func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply interface{}, opts ...CallOption) error {
30// allow interceptor to see all applicable call options, which means those
31// configured as defaults from dial option as well as per-call options
32opts = combine(cc.dopts.callOptions, opts)
33
34if cc.dopts.unaryInt != nil {
35return cc.dopts.unaryInt(ctx, method, args, reply, cc, invoke, opts...)
36}
37return invoke(ctx, method, args, reply, cc, opts...)
38}
39
40func combine(o1 []CallOption, o2 []CallOption) []CallOption {
41// we don't use append because o1 could have extra capacity whose
42// elements would be overwritten, which could cause inadvertent
43// sharing (and race conditions) between concurrent calls
44if len(o1) == 0 {
45return o2
46} else if len(o2) == 0 {
47return o1
48}
49ret := make([]CallOption, len(o1)+len(o2))
50copy(ret, o1)
51copy(ret[len(o1):], o2)
52return ret
53}
54
55// Invoke sends the RPC request on the wire and returns after response is
56// received. This is typically called by generated code.
57//
58// DEPRECATED: Use ClientConn.Invoke instead.
59func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) error {
60return cc.Invoke(ctx, method, args, reply, opts...)
61}
62
63var unaryStreamDesc = &StreamDesc{ServerStreams: false, ClientStreams: false}
64
65func invoke(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error {
66cs, err := newClientStream(ctx, unaryStreamDesc, cc, method, opts...)
67if err != nil {
68return err
69}
70if err := cs.SendMsg(req); err != nil {
71return err
72}
73return cs.RecvMsg(reply)
74}
75