performance improvements + a good amount of changes

src/main.cpp

@@ -0,0 +1,69 @@
+#include "backends/file_backend.cpp"
+#include <condition_variable>
+#include <exception>
+#include <fstream>
+#include <iostream>
+#include <mutex>
+#include <netinet/in.h>
+#include <sstream>
+#include <sys/socket.h>
+#include <thread>
+#include <unistd.h>
+#include <unordered_map>
+
+using namespace std;
+
+void log_request_and_response(http_request& req, unique_ptr<http_response>& resp);
+
+constexpr int default_port = 80;
+
+int active_threads = 0;
+mutex mtx;
+condition_variable cv;
+
+void handle_client(anthracite_socket s, file_backend& fb)
+{
+    http_request req(s);
+    unique_ptr<http_response> resp = fb.handle_request(req);
+    log_request_and_response(req, resp);
+    s.send_message(resp->to_string());
+    resp.reset();
+    s.close_conn();
+
+    {
+        std::lock_guard<std::mutex> lock(mtx);
+        active_threads--;
+    }
+
+    cv.notify_one();
+}
+
+int main(int argc, char** argv)
+{
+    int port_number = default_port;
+
+    if (argc > 1) {
+        port_number = atoi(argv[1]);
+    }
+
+    cout << "Initializing Anthracite" << endl;
+    anthracite_socket s(port_number);
+    file_backend fb(true);
+    cout << "Initialization Complete" << endl;
+    cout << "Listening for HTTP connections on port " << port_number << endl;
+
+    for (;;) {
+        s.wait_for_conn();
+        std::unique_lock<std::mutex> lock(mtx);
+        cv.wait(lock, [] { return active_threads < 20; });
+        active_threads++;
+        thread(handle_client, s, ref(fb)).detach();
+    }
+
+    exit(0);
+}
+
+void log_request_and_response(http_request& req, unique_ptr<http_response>& resp)
+{
+    cout << "[" << resp->status_code() << " " + http_status_map.find(resp->status_code())->second + "] " + req.client_ip() + " " + http_reverse_method_map.find(req.method())->second + " " + req.path() << endl;
+}