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#include "http_server.h"
#include "common/debug.h"
#include "common/hostname.h"
#include "global/global_init.h"
#include "global/global_context.h"
#include "exporter/DaemonMetricCollector.h"
#include <boost/asio.hpp>
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/thread/thread.hpp>
#include <chrono>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <map>
#include <memory>
#include <string>
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_ceph_exporter
namespace beast = boost::beast; // from <boost/beast.hpp>
namespace http = beast::http; // from <boost/beast/http.hpp>
namespace net = boost::asio; // from <boost/asio.hpp>
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
class http_connection : public std::enable_shared_from_this<http_connection> {
public:
http_connection(tcp::socket socket) : socket_(std::move(socket)) {}
// Initiate the asynchronous operations associated with the connection.
void start() {
read_request();
check_deadline();
}
private:
tcp::socket socket_;
beast::flat_buffer buffer_{8192};
http::request<http::dynamic_body> request_;
http::response<http::string_body> response_;
net::steady_timer deadline_{socket_.get_executor(), std::chrono::seconds(60)};
// Asynchronously receive a complete request message.
void read_request() {
auto self = shared_from_this();
http::async_read(socket_, buffer_, request_,
[self](beast::error_code ec, std::size_t bytes_transferred) {
boost::ignore_unused(bytes_transferred);
if (ec) {
dout(1) << "ERROR: " << ec.message() << dendl;
return;
}
else {
self->process_request();
}
});
}
// Determine what needs to be done with the request message.
void process_request() {
response_.version(request_.version());
response_.keep_alive(request_.keep_alive());
switch (request_.method()) {
case http::verb::get:
response_.result(http::status::ok);
create_response();
break;
default:
// We return responses indicating an error if
// we do not recognize the request method.
response_.result(http::status::method_not_allowed);
response_.set(http::field::content_type, "text/plain");
std::string body("Invalid request-method '" +
std::string(request_.method_string()) + "'");
response_.body() = body;
break;
}
write_response();
}
// Construct a response message based on the program state.
void create_response() {
if (request_.target() == "/") {
response_.set(http::field::content_type, "text/html; charset=utf-8");
std::string body("<html>\n"
"<head><title>Ceph Exporter</title></head>\n"
"<body>\n"
"<h1>Ceph Exporter</h1>\n"
"<p><a href='/metrics'>Metrics</a></p>"
"</body>\n"
"</html>\n");
response_.body() = body;
} else if (request_.target() == "/metrics") {
response_.set(http::field::content_type, "text/plain; charset=utf-8");
DaemonMetricCollector &collector = collector_instance();
std::string metrics = collector.get_metrics();
response_.body() = metrics;
} else {
response_.result(http::status::method_not_allowed);
response_.set(http::field::content_type, "text/plain");
response_.body() = "File not found \n";
}
}
// Asynchronously transmit the response message.
void write_response() {
auto self = shared_from_this();
response_.prepare_payload();
http::async_write(socket_, response_,
[self](beast::error_code ec, std::size_t) {
self->socket_.shutdown(tcp::socket::shutdown_send, ec);
self->deadline_.cancel();
if (ec) {
dout(1) << "ERROR: " << ec.message() << dendl;
return;
}
});
}
// Check whether we have spent enough time on this connection.
void check_deadline() {
auto self = shared_from_this();
deadline_.async_wait([self](beast::error_code ec) {
if (!ec) {
// Close socket to cancel any outstanding operation.
self->socket_.close(ec);
}
});
}
};
// "Loop" forever accepting new connections.
void http_server(tcp::acceptor &acceptor, tcp::socket &socket) {
acceptor.async_accept(socket, [&](beast::error_code ec) {
if (!ec)
std::make_shared<http_connection>(std::move(socket))->start();
http_server(acceptor, socket);
});
}
void http_server_thread_entrypoint() {
try {
std::string exporter_addr = g_conf().get_val<std::string>("exporter_addr");
auto const address = net::ip::make_address(exporter_addr);
unsigned short port = g_conf().get_val<int64_t>("exporter_http_port");
net::io_context ioc{1};
tcp::acceptor acceptor{ioc, {address, port}};
tcp::socket socket{ioc};
http_server(acceptor, socket);
dout(1) << "Http server running on " << exporter_addr << ":" << port << dendl;
ioc.run();
} catch (std::exception const &e) {
dout(1) << "Error: " << e.what() << dendl;
exit(EXIT_FAILURE);
}
}
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