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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.
// - Access pb services via HTTP
// ./http_client http://www.foo.com:8765/EchoService/Echo -d '{"message":"hello"}'
// - Access builtin services
// ./http_client http://www.foo.com:8765/vars/rpc_server*
// - Access www.foo.com
// ./http_client www.foo.com
#include <gflags/gflags.h>
#include <butil/logging.h>
#include <brpc/channel.h>
DEFINE_string(d, "", "POST this data to the http server");
DEFINE_string(load_balancer, "", "The algorithm for load balancing");
DEFINE_int32(timeout_ms, 1000, "RPC timeout in milliseconds");
DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)");
DEFINE_string(protocol, "http", "http or h2c");
namespace brpc {
DECLARE_bool(http_verbose);
}
int main(int argc, char* argv[]) {
// Parse gflags. We recommend you to use gflags as well.
GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);
if (argc != 2) {
LOG(ERROR) << "Usage: ./http_client \"www.foo.com\"";
return -1;
}
char* url = argv[1];
// 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;
brpc::ChannelOptions options;
options.protocol = FLAGS_protocol;
options.timeout_ms = FLAGS_timeout_ms/*milliseconds*/;
options.max_retry = FLAGS_max_retry;
// Initialize the channel, NULL means using default options.
// options, see `brpc/channel.h'.
if (channel.Init(url, FLAGS_load_balancer.c_str(), &options) != 0) {
LOG(ERROR) << "Fail to initialize channel";
return -1;
}
// We will receive response synchronously, safe to put variables
// on stack.
brpc::Controller cntl;
cntl.http_request().uri() = url;
if (!FLAGS_d.empty()) {
cntl.http_request().set_method(brpc::HTTP_METHOD_POST);
cntl.request_attachment().append(FLAGS_d);
}
// Because `done'(last parameter) is NULL, this function waits until
// the response comes back or error occurs(including timedout).
channel.CallMethod(NULL, &cntl, NULL, NULL, NULL);
if (cntl.Failed()) {
std::cerr << cntl.ErrorText() << std::endl;
return -1;
}
// If -http_verbose is on, brpc already prints the response to stderr.
if (!brpc::FLAGS_http_verbose) {
std::cout << cntl.response_attachment() << std::endl;
}
return 0;
}