First step of the connection skeleton

Basic connect, socket creating, polling, recving, etc.

1 files changed, 72 insertions, 0 deletions

diff --git a/src/network/poller.hpp b/src/network/poller.hpp
new file mode 100644
index 0000000..46a184e
--- /dev/null
+++ b/src/network/poller.hpp
@@ -0,0 +1,72 @@
+#ifndef POLLER_INCLUDED
+# define POLLER_INCLUDED
+
+#include <network/socket_handler.hpp>
+
+#include <unordered_map>
+#include <memory>
+
+#define POLL 1
+#define EPOLL 2
+#define KQUEUE 3
+
+#define POLLER POLL
+
+#if POLLER == POLL
+ #include <poll.h>
+ // TODO, dynamic size, without artificial limit
+ #define MAX_POLL_FD_NUMBER 4096
+#endif
+
+/**
+ * We pass some SocketHandlers to this the Poller, which uses
+ * poll/epoll/kqueue/select etc to wait for events on these SocketHandlers,
+ * and call the callbacks when event occurs.
+ *
+ * TODO: support for all these pollers:
+ * - poll(2) (mandatory)
+ * - epoll(7)
+ * - kqueue(2)
+ */
+
+
+class Poller
+{
+public:
+  explicit Poller();
+  ~Poller();
+  /**
+   * Add a SocketHandler to be monitored by this Poller. All receive events
+   * are always automatically watched.
+   */
+  void add_socket_handler(std::shared_ptr<SocketHandler> socket_handler);
+  /**
+   * Remove (and stop managing) a SocketHandler, designed by the given socket_t.
+   */
+  void remove_socket_handler(const socket_t socket);
+  /**
+   * Wait for all watched events, and call the SocketHandlers' callbacks
+   * when one is ready.
+   */
+  void poll();
+
+private:
+  /**
+   * A "list" of all the SocketHandlers that we manage, indexed by socket,
+   * because that's what is returned by select/poll/etc when an event
+   * occures.
+   */
+  std::unordered_map<socket_t, std::shared_ptr<SocketHandler>> socket_handlers;
+
+#if POLLER == POLL
+  struct pollfd fds[MAX_POLL_FD_NUMBER];
+  nfds_t nfds;
+#endif
+
+  Poller(const Poller&) = delete;
+  Poller(Poller&&) = delete;
+  Poller& operator=(const Poller&) = delete;
+  Poller& operator=(Poller&&) = delete;
+};
+
+#endif // POLLER_INCLUDED