130 lines
5.1 KiB
C++
130 lines
5.1 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// A client to send 2 requests to server and accept the first returned response.
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#include <gflags/gflags.h>
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#include <butil/logging.h>
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#include <butil/time.h>
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#include <brpc/channel.h>
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#include "echo.pb.h"
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DEFINE_string(protocol, "baidu_std", "Protocol type. Defined in src/brpc/options.proto");
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DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
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DEFINE_string(server, "0.0.0.0:8000", "IP Address of server");
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DEFINE_string(load_balancer, "", "The algorithm for load balancing");
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DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds");
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DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)");
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// A special done for canceling another RPC.
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class CancelRPC : public google::protobuf::Closure {
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public:
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explicit CancelRPC(brpc::CallId rpc_id) : _rpc_id(rpc_id) {}
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void Run() {
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brpc::StartCancel(_rpc_id);
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}
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private:
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brpc::CallId _rpc_id;
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};
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int main(int argc, char* argv[]) {
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// Parse gflags. We recommend you to use gflags as well.
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GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
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// A Channel represents a communication line to a Server. Notice that
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// Channel is thread-safe and can be shared by all threads in your program.
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brpc::Channel channel;
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// Initialize the channel, NULL means using default options.
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brpc::ChannelOptions options;
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options.protocol = FLAGS_protocol;
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options.connection_type = FLAGS_connection_type;
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options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/;
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options.max_retry = FLAGS_max_retry;
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if (channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &options) != 0) {
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LOG(ERROR) << "Fail to initialize channel";
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return -1;
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}
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// Normally, you should not call a Channel directly, but instead construct
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// a stub Service wrapping it. stub can be shared by all threads as well.
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example::EchoService_Stub stub(&channel);
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// Send a request and wait for the response every 1 second.
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int log_id = 0;
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while (!brpc::IsAskedToQuit()) {
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example::EchoRequest request1;
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example::EchoResponse response1;
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brpc::Controller cntl1;
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example::EchoRequest request2;
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example::EchoResponse response2;
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brpc::Controller cntl2;
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request1.set_message("hello1");
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request2.set_message("hello2");
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cntl1.set_log_id(log_id ++); // set by user
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cntl2.set_log_id(log_id ++);
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const brpc::CallId id1 = cntl1.call_id();
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const brpc::CallId id2 = cntl2.call_id();
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CancelRPC done1(id2);
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CancelRPC done2(id1);
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butil::Timer tm;
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tm.start();
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// Send 2 async calls and join them. They will cancel each other in
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// their done which is run before the RPC being Join()-ed. Canceling
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// a finished RPC has no effect.
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// For example:
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// Time RPC1 RPC2
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// 1 response1 comes back.
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// 2 running done1.
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// 3 cancel RPC2
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// 4 running done2 (NOTE: done also runs)
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// 5 cancel RPC1 (no effect)
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stub.Echo(&cntl1, &request1, &response1, &done1);
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stub.Echo(&cntl2, &request2, &response2, &done2);
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brpc::Join(id1);
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brpc::Join(id2);
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tm.stop();
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if (cntl1.Failed() && cntl2.Failed()) {
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LOG(WARNING) << "Both failed. rpc1:" << cntl1.ErrorText()
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<< ", rpc2: " << cntl2.ErrorText();
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} else if (!cntl1.Failed()) {
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LOG(INFO) << "Received `" << response1.message() << "' from rpc1="
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<< id1.value << '@' << cntl1.remote_side()
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<< " latency=" << tm.u_elapsed() << "us"
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<< " rpc1_latency=" << cntl1.latency_us() << "us"
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<< " rpc2_latency=" << cntl2.latency_us() << "us";
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} else {
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LOG(INFO) << "Received `" << response2.message() << "' from rpc2="
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<< id2.value << '@' << cntl2.remote_side()
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<< " latency=" << tm.u_elapsed() << "us"
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<< " rpc1_latency=" << cntl1.latency_us() << "us"
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<< " rpc2_latency=" << cntl2.latency_us() << "us";
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}
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sleep(1);
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}
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LOG(INFO) << "EchoClient is going to quit";
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return 0;
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}
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