111 lines
4.6 KiB
C++
111 lines
4.6 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 sending requests to server asynchronously every 1 second.
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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_bool(send_attachment, true, "Carry attachment along with requests");
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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, "0.0.0.0:8003", "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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void HandleEchoResponse(
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brpc::Controller* cntl,
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example::EchoResponse* response) {
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// std::unique_ptr makes sure cntl/response will be deleted before returning.
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std::unique_ptr<brpc::Controller> cntl_guard(cntl);
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std::unique_ptr<example::EchoResponse> response_guard(response);
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if (cntl->Failed()) {
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LOG(WARNING) << "Fail to send EchoRequest, " << cntl->ErrorText();
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return;
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}
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LOG(INFO) << "Received response from " << cntl->remote_side()
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<< ": " << response->message() << " (attached="
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<< cntl->response_attachment() << ")"
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<< " latency=" << cntl->latency_us() << "us";
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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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// Since we are sending asynchronous RPC (`done' is not NULL),
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// these objects MUST remain valid until `done' is called.
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// As a result, we allocate these objects on heap
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example::EchoResponse* response = new example::EchoResponse();
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brpc::Controller* cntl = new brpc::Controller();
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// Notice that you don't have to new request, which can be modified
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// or destroyed just after stub.Echo is called.
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example::EchoRequest request;
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request.set_message("hello world");
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cntl->set_log_id(log_id ++); // set by user
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if (FLAGS_send_attachment) {
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// Set attachment which is wired to network directly instead of
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// being serialized into protobuf messages.
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cntl->request_attachment().append("foo");
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}
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// We use protobuf utility `NewCallback' to create a closure object
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// that will call our callback `HandleEchoResponse'. This closure
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// will automatically delete itself after being called once
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google::protobuf::Closure* done = brpc::NewCallback(
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&HandleEchoResponse, cntl, response);
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stub.Echo(cntl, &request, response, done);
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// This is an asynchronous RPC, so we can only fetch the result
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// inside the callback
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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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