SocketHandlers own the poller and add themself into it only when the socket is created

We want to call socket() with the parameters provided by getaddrinfo, so we
can’t addd the fd into the poller immediately. We need to wait the
connection attempt, and then the SocketHandler can call add_socket_handler
itself, if the connection succeeds, or is in progress.

src/bridge/bridge.cpp

@@ -14,7 +14,7 @@ using namespace std::string_literals;
 
 static const char* action_prefix = "\01ACTION ";
 
-Bridge::Bridge(const std::string& user_jid, XmppComponent* xmpp, Poller* poller):
+Bridge::Bridge(const std::string& user_jid, XmppComponent* xmpp, std::shared_ptr<Poller> poller):
   user_jid(user_jid),
   xmpp(xmpp),
   poller(poller)
@@ -81,9 +81,8 @@ IrcClient* Bridge::get_irc_client(const std::string& hostname, const std::string
     }
   catch (const std::out_of_range& exception)
     {
-      this->irc_clients.emplace(hostname, std::make_shared<IrcClient>(hostname, username, this));
+      this->irc_clients.emplace(hostname, std::make_shared<IrcClient>(this->poller, hostname, username, this));
       std::shared_ptr<IrcClient> irc = this->irc_clients.at(hostname);
-      this->poller->add_socket_handler(irc);
       return irc.get();
     }
 }

src/bridge/bridge.hpp

@@ -22,7 +22,7 @@ class Poller;
 class Bridge
 {
 public:
-  explicit Bridge(const std::string& user_jid, XmppComponent* xmpp, Poller* poller);
+  explicit Bridge(const std::string& user_jid, XmppComponent* xmpp, std::shared_ptr<Poller> poller);
   ~Bridge();
   /**
    * QUIT all connected IRC servers.
@@ -146,9 +146,8 @@ private:
   /**
    * Poller, to give it the IrcClients that we spawn, to make it manage
    * their sockets.
-   * We don't own it.
    */
-  Poller* poller;
+  std::shared_ptr<Poller> poller;
 
   Bridge(const Bridge&) = delete;
   Bridge(Bridge&& other) = delete;

src/irc/irc_client.cpp

@@ -13,7 +13,8 @@
 #include <string>
 using namespace std::string_literals;
 
-IrcClient::IrcClient(const std::string& hostname, const std::string& username, Bridge* bridge):
+IrcClient::IrcClient(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& username, Bridge* bridge):
+  SocketHandler(poller),
   hostname(hostname),
   username(username),
   current_nick(username),

src/irc/irc_client.hpp

@@ -8,6 +8,7 @@
 #include <network/socket_handler.hpp>
 
 #include <unordered_map>
+#include <memory>
 #include <vector>
 #include <string>
 #include <map>
@@ -23,7 +24,7 @@ class Bridge;
 class IrcClient: public SocketHandler
 {
 public:
-  explicit IrcClient(const std::string& hostname, const std::string& username, Bridge* bridge);
+  explicit IrcClient(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& username, Bridge* bridge);
   ~IrcClient();
   /**
    * Connect to the IRC server

src/main.cpp

@@ -61,11 +61,11 @@ int main(int ac, char** av)
     return config_help("password");
   if (hostname.empty())
     return config_help("hostname");
-  std::shared_ptr<XmppComponent> xmpp_component =
-    std::make_shared<XmppComponent>(hostname, password);
 
-  Poller p;
+  auto p = std::make_shared<Poller>();
-  p.add_socket_handler(xmpp_component);
+  auto xmpp_component = std::make_shared<XmppComponent>(p,
+                                                        hostname,
+                                                        password);
 
   // Install the signals used to exit the process cleanly, or reload the
   // config
@@ -91,7 +91,7 @@ int main(int ac, char** av)
   xmpp_component->start();
 
   const std::chrono::milliseconds timeout(-1);
-  while (p.poll(timeout) != -1)
+  while (p->poll(timeout) != -1)
   {
     // Check for empty irc_clients (not connected, or with no joined
     // channel) and remove them
@@ -123,14 +123,13 @@ int main(int ac, char** av)
         !xmpp_component->is_connecting())
       {
         xmpp_component->reset();
-        p.add_socket_handler(xmpp_component);
         xmpp_component->start();
       }
     // If the only existing connection is the one to the XMPP component:
     // close the XMPP stream.
     if (exiting && xmpp_component->is_connecting())
       xmpp_component->close();
-    if (exiting && p.size() == 1 && xmpp_component->is_document_open())
+    if (exiting && p->size() == 1 && xmpp_component->is_document_open())
       xmpp_component->close_document();
   }
   log_info("All connection cleanely closed, have a nice day.");

src/network/poller.cpp

@@ -27,15 +27,14 @@ Poller::~Poller()
 {
 }
 
-void Poller::add_socket_handler(std::shared_ptr<SocketHandler> socket_handler)
+void Poller::add_socket_handler(SocketHandler* socket_handler)
 {
-  // Raise an error if that socket is already in the list
+  // Don't do anything if the socket is already managed
   const auto it = this->socket_handlers.find(socket_handler->get_socket());
   if (it != this->socket_handlers.end())
-    throw std::runtime_error("Trying to insert SocketHandler already managed");
+    return ;
 
   this->socket_handlers.emplace(socket_handler->get_socket(), socket_handler);
-  socket_handler->set_poller(this);
 
   // We always watch all sockets for receive events
 #if POLLER == POLL
@@ -44,7 +43,7 @@ void Poller::add_socket_handler(std::shared_ptr<SocketHandler> socket_handler)
   this->nfds++;
 #endif
 #if POLLER == EPOLL
-  struct epoll_event event = {EPOLLIN, {socket_handler.get()}};
+  struct epoll_event event = {EPOLLIN, {socket_handler}};
   const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_ADD, socket_handler->get_socket(), &event);
   if (res == -1)
     {

src/network/poller.hpp

@@ -42,7 +42,7 @@ public:
    * 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);
+  void add_socket_handler(SocketHandler* socket_handler);
   /**
    * Remove (and stop managing) a SocketHandler, designed by the given socket_t.
    */
@@ -77,7 +77,7 @@ private:
    * 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;
+  std::unordered_map<socket_t, SocketHandler*> socket_handlers;
 
 #if POLLER == POLL
   struct pollfd fds[MAX_POLL_FD_NUMBER];

src/network/socket_handler.cpp

@@ -23,8 +23,8 @@ using namespace std::string_literals;
 # define UIO_FASTIOV 8
 #endif
 
-SocketHandler::SocketHandler():
+SocketHandler::SocketHandler(std::shared_ptr<Poller> poller):
-  poller(nullptr),
+  poller(poller),
   connected(false),
   connecting(false)
 {
@@ -107,6 +107,7 @@ void SocketHandler::connect(const std::string& address, const std::string& port)
           || errno == EISCONN)
         {
           log_info("Connection success.");
+          this->poller->add_socket_handler(this);
           this->connected = true;
           this->connecting = false;
           this->on_connected();
@@ -134,11 +135,6 @@ void SocketHandler::connect()
   this->connect(this->address, this->port);
 }
 
-void SocketHandler::set_poller(Poller* poller)
-{
-  this->poller = poller;
-}
-
 void SocketHandler::on_recv()
 {
   static constexpr size_t buf_size = 4096;
@@ -231,8 +227,6 @@ void SocketHandler::close()
   this->port.clear();
   this->poller->remove_socket_handler(this->get_socket());
   ::close(this->socket);
-  // recreate the socket for a potential future usage
-  this->init_socket();
 }
 
 socket_t SocketHandler::get_socket() const

src/network/socket_handler.hpp

@@ -6,6 +6,7 @@
 #include <netdb.h>
 
 #include <utility>
+#include <memory>
 #include <string>
 #include <list>
 
@@ -22,7 +23,7 @@ class Poller;
 class SocketHandler
 {
 public:
-  explicit SocketHandler();
+  explicit SocketHandler(std::shared_ptr<Poller> poller);
   virtual ~SocketHandler() {}
   /**
    * (re-)Initialize the socket
@@ -33,10 +34,6 @@ public:
    */
   void connect(const std::string& address, const std::string& port);
   void connect();
-  /**
-   * Set the pointer to the given Poller, to communicate with it.
-   */
-  void set_poller(Poller* poller);
   /**
    * Reads data in our in_buf and the call parse_in_buf, for the implementor
    * to handle the data received so far.
@@ -119,7 +116,7 @@ protected:
    * And a raw pointer because we are not owning it, it is owning us
    * (actually it is sharing our ownership with a Bridge).
    */
-  Poller* poller;
+  std::shared_ptr<Poller> poller;
   /**
    * Hostname we are connected/connecting to
    */

src/xmpp/xmpp_component.cpp

@@ -47,7 +47,8 @@ static std::set<std::string> kickable_errors{
     "malformed-error"
     };
 
-XmppComponent::XmppComponent(const std::string& hostname, const std::string& secret):
+XmppComponent::XmppComponent(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& secret):
+  SocketHandler(poller),
   ever_auth(false),
   last_auth(false),
   served_hostname(hostname),

src/xmpp/xmpp_component.hpp

@@ -18,7 +18,7 @@
 class XmppComponent: public SocketHandler
 {
 public:
-  explicit XmppComponent(const std::string& hostname, const std::string& secret);
+  explicit XmppComponent(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& secret);
   ~XmppComponent();
 
   void on_connection_failed(const std::string& reason) override final;