Improved documentation of call() method (Fixes #813)

src/socketio/asyncio_client.py

@@ -254,6 +254,12 @@ async def send(self, data, namespace=None, callback=None):
     async def call(self, event, data=None, namespace=None, timeout=60):
         """Emit a custom event to a client and wait for the response.
 
+        This method issues an emit with a callback and waits for the callback
+        to be invoked before returning. If the callback isn't invoked before
+        the timeout, then a ``TimeoutError`` exception is raised. If the
+        Socket.IO connection drops during the wait, this method still waits
+        until the specified timeout.
+
         :param event: The event name. It can be any string. The event names
                       ``'connect'``, ``'message'`` and ``'disconnect'`` are
                       reserved and should not be used.

src/socketio/asyncio_server.py

@@ -210,6 +210,12 @@ async def call(self, event, data=None, to=None, sid=None, namespace=None,
                    timeout=60, **kwargs):
         """Emit a custom event to a client and wait for the response.
 
+        This method issues an emit with a callback and waits for the callback
+        to be invoked before returning. If the callback isn't invoked before
+        the timeout, then a ``TimeoutError`` exception is raised. If the
+        Socket.IO connection drops during the wait, this method still waits
+        until the specified timeout.
+
         :param event: The event name. It can be any string. The event names
                       ``'connect'``, ``'message'`` and ``'disconnect'`` are
                       reserved and should not be used.

src/socketio/client.py

@@ -430,6 +430,12 @@ def send(self, data, namespace=None, callback=None):
     def call(self, event, data=None, namespace=None, timeout=60):
         """Emit a custom event to a client and wait for the response.
 
+        This method issues an emit with a callback and waits for the callback
+        to be invoked before returning. If the callback isn't invoked before
+        the timeout, then a ``TimeoutError`` exception is raised. If the
+        Socket.IO connection drops during the wait, this method still waits
+        until the specified timeout.
+
         :param event: The event name. It can be any string. The event names
                       ``'connect'``, ``'message'`` and ``'disconnect'`` are
                       reserved and should not be used.

src/socketio/server.py

@@ -355,6 +355,12 @@ def call(self, event, data=None, to=None, sid=None, namespace=None,
              timeout=60, **kwargs):
         """Emit a custom event to a client and wait for the response.
 
+        This method issues an emit with a callback and waits for the callback
+        to be invoked before returning. If the callback isn't invoked before
+        the timeout, then a ``TimeoutError`` exception is raised. If the
+        Socket.IO connection drops during the wait, this method still waits
+        until the specified timeout.
+
         :param event: The event name. It can be any string. The event names
                       ``'connect'``, ``'message'`` and ``'disconnect'`` are
                       reserved and should not be used.