add outermost wsi lifetime callbacks

Signed-off-by: Andy Green <andy.green@linaro.org>

lib/libwebsockets.c

@@ -485,6 +485,11 @@ just_kill_connection:
 #ifdef LWS_OPENSSL_SUPPORT
 	}
 #endif
+
+	/* outermost destroy notification for wsi (user_space still intact) */
+	context->protocols[0].callback(context, wsi,
+			LWS_CALLBACK_WSI_DESTROY, wsi->user_space, NULL, 0);
+
 	if (wsi->protocol && wsi->protocol->per_session_data_size &&
 					wsi->user_space) /* user code may own */
 		free(wsi->user_space);

lib/libwebsockets.h

@@ -182,6 +182,8 @@ enum libwebsocket_callback_reasons {
 	LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED,
 	LWS_CALLBACK_PROTOCOL_INIT,
 	LWS_CALLBACK_PROTOCOL_DESTROY,
+	LWS_CALLBACK_WSI_CREATE, /* always protocol[0] */
+	LWS_CALLBACK_WSI_DESTROY, /* always protocol[0] */
 	LWS_CALLBACK_GET_THREAD_ID,
 
 	/* external poll() management support */
@@ -680,6 +682,10 @@ struct libwebsocket_extension;
  *		context is getting destroyed.  Take the opportunity to
  *		deallocate everything that was allocated by the protocol.
  *
+ *	LWS_CALLBACK_WSI_CREATE: outermost (earliest) wsi create notification
+ *
+ *	LWS_CALLBACK_WSI_DESTROY: outermost (latest) wsi destroy notification
+ *
  *	The next four reasons are optional and only need taking care of if you
  *	will be integrating libwebsockets sockets into an external polling
  *	array.

lib/server.c

@@ -119,6 +119,13 @@ libwebsocket_create_new_server_wsi(struct libwebsocket_context *context)
 	new_wsi->user_space = NULL;
 	new_wsi->ietf_spec_revision = 0;
 
+	/*
+	 * outermost create notification for wsi
+	 * no user_space because no protocol selection
+	 */
+	context->protocols[0].callback(context, new_wsi,
+			LWS_CALLBACK_WSI_CREATE, NULL, NULL, 0);
+
 	return new_wsi;
 }