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- // Licensed to the Apache Software Foundation (ASF) under one
- // or more contributor license agreements. See the NOTICE file
- // distributed with this work for additional information
- // regarding copyright ownership. The ASF licenses this file
- // to you under the Apache License, Version 2.0 (the
- // "License"); you may not use this file except in compliance
- // with the License. You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing,
- // software distributed under the License is distributed on an
- // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- // KIND, either express or implied. See the License for the
- // specific language governing permissions and limitations
- // under the License.
- // A client sending requests to server every 1 second.
- #include <gflags/gflags.h>
- #include <butil/logging.h>
- #include <butil/time.h>
- #include <brpc/channel.h>
- #include <brpc/policy/hulu_pbrpc_controller.h>
- #include "echo.pb.h"
- DEFINE_string(attachment, "", "Carry this along with requests");
- DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
- DEFINE_string(server, "0.0.0.0:8000", "IP Address of server");
- DEFINE_string(load_balancer, "", "The algorithm for load balancing");
- DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds");
- DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)");
- DEFINE_int32(interval_ms, 1000, "Milliseconds between consecutive requests");
- int main(int argc, char* argv[]) {
- // Parse gflags. We recommend you to use gflags as well.
- GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
-
- // A Channel represents a communication line to a Server. Notice that
- // Channel is thread-safe and can be shared by all threads in your program.
- brpc::Channel channel;
-
- // Initialize the channel, NULL means using default options.
- brpc::ChannelOptions options;
- options.protocol = "hulu_pbrpc";
- options.connection_type = FLAGS_connection_type;
- options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/;
- options.max_retry = FLAGS_max_retry;
- if (channel.Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &options) != 0) {
- LOG(ERROR) << "Fail to initialize channel";
- return -1;
- }
- // Normally, you should not call a Channel directly, but instead construct
- // a stub Service wrapping it. stub can be shared by all threads as well.
- example::EchoService_Stub stub(&channel);
- // Send a request and wait for the response every 1 second.
- int log_id = 0;
- while (!brpc::IsAskedToQuit()) {
- // We will receive response synchronously, safe to put variables
- // on stack.
- example::EchoRequest request;
- example::EchoResponse response;
- brpc::policy::HuluController cntl;
- request.set_message("hello world");
- cntl.set_log_id(log_id++); // set by user
- cntl.request_attachment().append(FLAGS_attachment);
- cntl.set_request_source_addr(log_id++);
- cntl.set_request_user_data("client user data");
- // Because `done'(last parameter) is NULL, this function waits until
- // the response comes back or error occurs(including timedout).
- stub.Echo(&cntl, &request, &response, NULL);
- if (!cntl.Failed()) {
- LOG(INFO) << "Received response from " << cntl.remote_side()
- << " to " << cntl.local_side()
- << ": " << response.message() << " (attached="
- << cntl.response_attachment() << ")"
- << " response_source_addr=" << cntl.response_source_addr()
- << " response_user_data=\"" << cntl.response_user_data()
- << "\" latency=" << cntl.latency_us() << "us";
- } else {
- LOG(WARNING) << cntl.ErrorText();
- }
- usleep(FLAGS_interval_ms * 1000L);
- }
- LOG(INFO) << "EchoClient is going to quit";
- return 0;
- }
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