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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 server in parallel 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/parallel_channel.h>
#include <brpc/server.h>
#include "echo.pb.h"
DEFINE_int32(thread_num, 50, "Number of threads to send requests");
DEFINE_int32(channel_num, 3, "Number of sub channels");
DEFINE_bool(same_channel, false, "Add the same sub channel multiple times");
DEFINE_bool(use_bthread, false, "Use bthread to send requests");
DEFINE_int32(attachment_size, 0, "Carry so many byte attachment along with requests");
DEFINE_int32(request_size, 16, "Bytes of each request");
DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
DEFINE_string(protocol, "baidu_std", "Protocol type. Defined in src/brpc/options.proto");
DEFINE_string(server, "0.0.0.0:8002", "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_bool(dont_fail, false, "Print fatal when some call failed");
DEFINE_int32(dummy_port, -1, "Launch dummy server at this port");
std::string g_request;
std::string g_attachment;
bvar::LatencyRecorder g_latency_recorder("client");
bvar::Adder<int> g_error_count("client_error_count");
bvar::LatencyRecorder* g_sub_channel_latency = NULL;
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;
request.set_value(log_id++);
if (!g_attachment.empty()) {
// Set attachment which is wired to network directly instead of
// being serialized into protobuf messages.
cntl.request_attachment().append(g_attachment);
}
// 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()) {
g_latency_recorder << cntl.latency_us();
for (int i = 0; i < cntl.sub_count(); ++i) {
if (cntl.sub(i) && !cntl.sub(i)->Failed()) {
g_sub_channel_latency[i] << cntl.sub(i)->latency_us();
}
}
} else {
g_error_count << 1;
CHECK(brpc::IsAskedToQuit() || !FLAGS_dont_fail)
<< "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::ParallelChannel channel;
brpc::ParallelChannelOptions pchan_options;
pchan_options.timeout_ms = FLAGS_timeout_ms;
if (channel.Init(&pchan_options) != 0) {
LOG(ERROR) << "Fail to init ParallelChannel";
return -1;
}
brpc::ChannelOptions sub_options;
sub_options.protocol = FLAGS_protocol;
sub_options.connection_type = FLAGS_connection_type;
sub_options.max_retry = FLAGS_max_retry;
// Setting sub_options.timeout_ms does not work because timeout of sub
// channels are disabled in ParallelChannel.
if (FLAGS_same_channel) {
// For brpc >= 1.0.155.31351, a sub channel can be added into
// a ParallelChannel more than once.
brpc::Channel* sub_channel = new brpc::Channel;
// Initialize the channel, NULL means using default options.
// options, see `brpc/channel.h'.
if (sub_channel->Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &sub_options) != 0) {
LOG(ERROR) << "Fail to initialize sub_channel";
return -1;
}
for (int i = 0; i < FLAGS_channel_num; ++i) {
if (channel.AddChannel(sub_channel, brpc::OWNS_CHANNEL,
NULL, NULL) != 0) {
LOG(ERROR) << "Fail to AddChannel, i=" << i;
return -1;
}
}
} else {
for (int i = 0; i < FLAGS_channel_num; ++i) {
brpc::Channel* sub_channel = new brpc::Channel;
// Initialize the channel, NULL means using default options.
// options, see `brpc/channel.h'.
if (sub_channel->Init(FLAGS_server.c_str(), FLAGS_load_balancer.c_str(), &sub_options) != 0) {
LOG(ERROR) << "Fail to initialize sub_channel[" << i << "]";
return -1;
}
if (channel.AddChannel(sub_channel, brpc::OWNS_CHANNEL,
NULL, NULL) != 0) {
LOG(ERROR) << "Fail to AddChannel, i=" << i;
return -1;
}
}
}
// Initialize bvar for sub channel
g_sub_channel_latency = new bvar::LatencyRecorder[FLAGS_channel_num];
for (int i = 0; i < FLAGS_channel_num; ++i) {
std::string name;
butil::string_printf(&name, "client_sub_%d", i);
g_sub_channel_latency[i].expose(name);
}
if (FLAGS_attachment_size > 0) {
g_attachment.resize(FLAGS_attachment_size, 'a');
}
if (FLAGS_request_size <= 0) {
LOG(ERROR) << "Bad request_size=" << FLAGS_request_size;
return -1;
}
g_request.resize(FLAGS_request_size, 'r');
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) << noflush;
for (int i = 0; i < FLAGS_channel_num; ++i) {
LOG(INFO) << " latency_" << i << "="
<< g_sub_channel_latency[i].latency(1)
<< noflush;
}
LOG(INFO);
}
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;
}