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/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
    */