First step of the connection skeleton

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

2 files changed, 169 insertions, 0 deletions

diff --git a/src/libirc/irc_client.cpp b/src/libirc/irc_client.cpp
new file mode 100644
index 0000000..a29e588
--- /dev/null
+++ b/src/libirc/irc_client.cpp
@@ -0,0 +1,102 @@
+#include <libirc/irc_client.hpp>
+#include <network/poller.hpp>
+#include <utils/scopeguard.hpp>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <cstring>
+#include <netdb.h>
+#include <unistd.h>
+
+#include <iostream>
+#include <stdexcept>
+
+IrcClient::IrcClient()
+{
+  std::cout << "IrcClient()" << std::endl;
+  if ((this->socket = ::socket(AF_INET, SOCK_STREAM, 0)) == -1)
+    throw std::runtime_error("Could not create socket");
+}
+
+IrcClient::~IrcClient()
+{
+  std::cout << "~IrcClient()" << std::endl;
+}
+
+void IrcClient::on_recv()
+{
+  char buf[4096];
+
+  ssize_t size = ::recv(this->socket, buf, 4096, 0);
+  if (0 == size)
+    this->on_connection_close();
+  else if (-1 == static_cast<ssize_t>(size))
+    throw std::runtime_error("Error reading from socket");
+  else
+    {
+      this->in_buf += std::string(buf, size);
+      this->parse_in_buffer();
+    }
+}
+
+void IrcClient::on_send()
+{
+}
+
+socket_t IrcClient::get_socket() const
+{
+  return this->socket;
+}
+
+void IrcClient::connect(const std::string& address, const std::string& port)
+{
+  std::cout << "Trying to connect to " << address << ":" << port << std::endl;
+  struct addrinfo hints;
+  memset(&hints, 0, sizeof(struct addrinfo));
+  hints.ai_flags = 0;
+  hints.ai_family = AF_INET;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_protocol = 0;
+
+  struct addrinfo* addr_res;
+  const int res = ::getaddrinfo(address.c_str(), port.c_str(), &hints, &addr_res);
+  // Make sure the alloced structure is always freed at the end of the
+  // function
+  utils::ScopeGuard sg([&addr_res](){ freeaddrinfo(addr_res); });
+
+  if (res != 0)
+    {
+      perror("getaddrinfo");
+      throw std::runtime_error("getaddrinfo failed");
+    }
+  for (struct addrinfo* rp = addr_res; rp; rp = rp->ai_next)
+    {
+      std::cout << "One result" << std::endl;
+      if (::connect(this->socket, rp->ai_addr, rp->ai_addrlen) == 0)
+        {
+          std::cout << "Connection success." << std::endl;
+          return ;
+        }
+      std::cout << "Connection failed:" << std::endl;
+      perror("connect");
+    }
+  std::cout << "All connection attempts failed." << std::endl;
+  this->close();
+}
+
+void IrcClient::on_connection_close()
+{
+  std::cout << "Connection closed by remote server." << std::endl;
+  this->close();
+}
+
+void IrcClient::close()
+{
+  this->poller->remove_socket_handler(this->get_socket());
+  ::close(this->socket);
+}
+
+void IrcClient::parse_in_buffer()
+{
+  std::cout << "Parsing: [" << this->in_buf << "]" << std::endl;
+}
diff --git a/src/libirc/irc_client.hpp b/src/libirc/irc_client.hpp
new file mode 100644
index 0000000..73e7efd
--- /dev/null
+++ b/src/libirc/irc_client.hpp
@@ -0,0 +1,67 @@
+#ifndef IRC_CLIENT_INCLUDED
+# define IRC_CLIENT_INCLUDED
+
+#include <network/socket_handler.hpp>
+
+#include <string>
+
+/**
+ * Represent one IRC client, i.e. an endpoint connected to a single IRC
+ * server, through a TCP socket, receiving and sending commands to it.
+ *
+ * TODO: TLS support, maybe, but that's not high priority
+ */
+class IrcClient: public SocketHandler
+{
+public:
+  explicit IrcClient();
+  ~IrcClient();
+  /**
+   * We read the data, try to parse it and generate some event if
+   * one or more full message is available.
+   */
+  void on_recv();
+  /**
+   * Just write as much data as possible on the socket.
+   */
+  void on_send();
+  socket_t get_socket() const;
+  /**
+   * Connect to the remote server
+   */
+  void connect(const std::string& address, const std::string& port);
+  /**
+   * Close the connection, remove us from the poller
+   */
+  void close();
+  /**
+   * Called when we detect an orderly close by the remote endpoint.
+   */
+  void on_connection_close();
+  /**
+   * Parse the data we have received so far and try to get one or more
+   * complete messages from it.
+   */
+  void parse_in_buffer();
+
+private:
+  socket_t socket;
+  /**
+   * Where data read from the socket is added, until we can parse a whole
+   * IRC message, the used data is then removed from that buffer.
+   *
+   * TODO: something more efficient than a string.
+   */
+  std::string in_buf;
+  /**
+   * Where data is added, when we want to send something to the client.
+   */
+  std::string out_buf;
+
+  IrcClient(const IrcClient&) = delete;
+  IrcClient(IrcClient&&) = delete;
+  IrcClient& operator=(const IrcClient&) = delete;
+  IrcClient& operator=(IrcClient&&) = delete;
+};
+
+#endif // IRC_CLIENT_INCLUDED