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- // Copyright (c) 2014 Baidu, Inc.
- //
- // Licensed 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 servers(discovered by naming service) by multiple threads.
- #include <gflags/gflags.h>
- #include <bthread/bthread.h>
- #include <butil/logging.h>
- #include <butil/string_printf.h>
- #include <butil/time.h>
- #include <butil/macros.h>
- #include <brpc/channel.h>
- #include <brpc/server.h>
- #include <deque>
- #include "echo.pb.h"
- DEFINE_int32(thread_num, 50, "Number of threads to send requests");
- DEFINE_bool(use_bthread, false, "Use bthread to send requests");
- DEFINE_int32(attachment_size, 0, "Carry so many byte attachment along with requests");
- DEFINE_string(protocol, "baidu_std", "Protocol type. Defined in src/brpc/options.proto");
- DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
- DEFINE_string(server, "file://server_list", "Addresses of servers");
- DEFINE_string(load_balancer, "rr", "Name of load balancer");
- DEFINE_int32(timeout_ms, 100, "RPC timeout in milliseconds");
- DEFINE_int32(backup_timeout_ms, -1, "backup timeout in milliseconds");
- DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)");
- DEFINE_bool(dont_fail, false, "Print fatal when some call failed");
- DEFINE_int32(dummy_port, 0, "Launch dummy server at this port");
- DEFINE_string(http_content_type, "application/json", "Content type of http request");
- std::string g_attachment;
- bvar::LatencyRecorder g_latency_recorder("client");
- bvar::Adder<int> g_error_count("client_error_count");
- butil::static_atomic<int> g_sender_count = BUTIL_STATIC_ATOMIC_INIT(0);
- static void* sender(void* arg) {
- // 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(static_cast<google::protobuf::RpcChannel*>(arg));
- 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::Controller cntl;
- const int thread_index = g_sender_count.fetch_add(1, butil::memory_order_relaxed);
- const int input = ((thread_index & 0xFFF) << 20) | (log_id & 0xFFFFF);
- request.set_value(input);
- cntl.set_log_id(log_id ++); // set by user
- if (FLAGS_protocol != "http" && FLAGS_protocol != "h2c") {
- // Set attachment which is wired to network directly instead of
- // being serialized into protobuf messages.
- cntl.request_attachment().append(g_attachment);
- } else {
- cntl.http_request().set_content_type(FLAGS_http_content_type);
- }
- // 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()) {
- CHECK(response.value() == request.value() + 1);
- g_latency_recorder << cntl.latency_us();
- } else {
- g_error_count << 1;
- CHECK(brpc::IsAskedToQuit() || !FLAGS_dont_fail)
- << "input=(" << thread_index << "," << (input & 0xFFFFF)
- << ") error=" << cntl.ErrorText() << " latency=" << cntl.latency_us();
- // We can't connect to the server, sleep a while. Notice that this
- // is a specific sleeping to prevent this thread from spinning too
- // fast. You should continue the business logic in a production
- // server rather than sleeping.
- bthread_usleep(50000);
- }
- }
- return NULL;
- }
- 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.backup_request_ms = FLAGS_backup_timeout_ms;
- options.protocol = FLAGS_protocol;
- 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;
- }
- if (FLAGS_attachment_size > 0) {
- g_attachment.resize(FLAGS_attachment_size, 'a');
- }
- if (FLAGS_dummy_port > 0) {
- brpc::StartDummyServerAt(FLAGS_dummy_port);
- }
- std::vector<bthread_t> tids;
- tids.resize(FLAGS_thread_num);
- if (!FLAGS_use_bthread) {
- for (int i = 0; i < FLAGS_thread_num; ++i) {
- if (pthread_create(&tids[i], NULL, sender, &channel) != 0) {
- LOG(ERROR) << "Fail to create pthread";
- return -1;
- }
- }
- } else {
- for (int i = 0; i < FLAGS_thread_num; ++i) {
- if (bthread_start_background(
- &tids[i], NULL, sender, &channel) != 0) {
- LOG(ERROR) << "Fail to create bthread";
- return -1;
- }
- }
- }
- while (!brpc::IsAskedToQuit()) {
- sleep(1);
- LOG(INFO) << "Sending EchoRequest at qps=" << g_latency_recorder.qps(1)
- << " latency=" << g_latency_recorder.latency(1);
- }
- LOG(INFO) << "EchoClient is going to quit";
- for (int i = 0; i < FLAGS_thread_num; ++i) {
- if (!FLAGS_use_bthread) {
- pthread_join(tids[i], NULL);
- } else {
- bthread_join(tids[i], NULL);
- }
- }
- return 0;
- }
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