1 files changed, 169 insertions, 0 deletions
diff --git a/src/exporter/http_server.cc b/src/exporter/http_server.cc
new file mode 100644
index 000000000..317d877e8
--- /dev/null
+++ b/src/exporter/http_server.cc
@@ -0,0 +1,169 @@
+#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);
+  }
+}