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94 lines
3.0 KiB
Go
94 lines
3.0 KiB
Go
/*
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*
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* Copyright 2014 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package grpc
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import (
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"golang.org/x/net/context"
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)
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// Invoke sends the RPC request on the wire and returns after response is
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// received. This is typically called by generated code.
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//
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// All errors returned by Invoke are compatible with the status package.
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func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply interface{}, opts ...CallOption) error {
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// allow interceptor to see all applicable call options, which means those
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// configured as defaults from dial option as well as per-call options
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opts = combine(cc.dopts.callOptions, opts)
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if cc.dopts.unaryInt != nil {
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return cc.dopts.unaryInt(ctx, method, args, reply, cc, invoke, opts...)
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}
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return invoke(ctx, method, args, reply, cc, opts...)
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}
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func combine(o1 []CallOption, o2 []CallOption) []CallOption {
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// we don't use append because o1 could have extra capacity whose
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// elements would be overwritten, which could cause inadvertent
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// sharing (and race connditions) between concurrent calls
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if len(o1) == 0 {
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return o2
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} else if len(o2) == 0 {
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return o1
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}
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ret := make([]CallOption, len(o1)+len(o2))
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copy(ret, o1)
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copy(ret[len(o1):], o2)
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return ret
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}
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// Invoke sends the RPC request on the wire and returns after response is
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// received. This is typically called by generated code.
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//
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// DEPRECATED: Use ClientConn.Invoke instead.
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func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) error {
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return cc.Invoke(ctx, method, args, reply, opts...)
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}
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var unaryStreamDesc = &StreamDesc{ServerStreams: false, ClientStreams: false}
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func invoke(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error {
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// TODO: implement retries in clientStream and make this simply
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// newClientStream, SendMsg, RecvMsg.
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firstAttempt := true
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for {
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csInt, err := newClientStream(ctx, unaryStreamDesc, cc, method, opts...)
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if err != nil {
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return err
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}
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cs := csInt.(*clientStream)
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if err := cs.SendMsg(req); err != nil {
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if !cs.c.failFast && cs.attempt.s.Unprocessed() && firstAttempt {
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// TODO: Add a field to header for grpc-transparent-retry-attempts
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firstAttempt = false
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continue
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}
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return err
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}
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if err := cs.RecvMsg(reply); err != nil {
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if !cs.c.failFast && cs.attempt.s.Unprocessed() && firstAttempt {
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// TODO: Add a field to header for grpc-transparent-retry-attempts
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firstAttempt = false
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continue
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}
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return err
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}
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return nil
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}
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}
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