docs: update the iq tutorial

docs/getting_started/iq.rst

@@ -3,7 +3,7 @@ Send/Receive IQ Stanzas
 
 Unlike :class:`~slixmpp.stanza.message.Message` and
 :class:`~slixmpp.stanza.presence.Presence` stanzas which only use
-text data for basic usage, :class:`~slixmpp.stanza.iq.Iq` stanzas
+text data for basic usage, :class:`~slixmpp.stanza.Iq` stanzas
 require using XML payloads, and generally entail creating a new
 Slixmpp plugin to provide the necessary convenience methods to
 make working with them easier.
@@ -11,7 +11,7 @@ make working with them easier.
 Basic Use
 ---------
 
-XMPP's use of :class:`~slixmpp.stanza.iq.Iq` stanzas is built around
+XMPP's use of :class:`~slixmpp.stanza.Iq` stanzas is built around
 namespaced ``<query />`` elements. For clients, just sending the
 empty ``<query />`` element will suffice for retrieving information. For
 example, a very basic implementation of service discovery would just
@@ -26,7 +26,7 @@ need to be able to send:
 Creating Iq Stanzas
 ~~~~~~~~~~~~~~~~~~~
 
-Slixmpp provides built-in support for creating basic :class:`~slixmpp.stanza.iq.Iq`
+Slixmpp provides built-in support for creating basic :class:`~slixmpp.stanza.Iq`
 stanzas this way. The relevant methods are:
 
 * :meth:`~slixmpp.basexmpp.BaseXMPP.make_iq`
@@ -37,7 +37,7 @@ stanzas this way. The relevant methods are:
 * :meth:`~slixmpp.basexmpp.BaseXMPP.make_iq_query`
 
 These methods all follow the same pattern: create or modify an existing
-:class:`~slixmpp.stanza.iq.Iq` stanza, set the ``'type'`` value based
+:class:`~slixmpp.stanza.Iq` stanza, set the ``'type'`` value based
 on the method name, and finally add a ``<query />`` element with the given
 namespace. For example, to produce the query above, you would use:
 
@@ -50,19 +50,17 @@ namespace. For example, to produce the query above, you would use:
 Sending Iq Stanzas
 ~~~~~~~~~~~~~~~~~~
 
-Once an :class:`~slixmpp.stanza.iq.Iq` stanza is created, sending it
+Once an :class:`~slixmpp.stanza.Iq` stanza is created, sending it
-over the wire is done using its :meth:`~slixmpp.stanza.iq.Iq.send()`
+over the wire is done using its :meth:`~slixmpp.stanza.Iq.send()`
 method, like any other stanza object. However, there are a few extra
-options to control how to wait for the query's response.
+options to control how to wait for the query's response, as well as
+how to handle the result.
+
+:meth:`~slixmpp.stanza.Iq.send()` returns an :class:`~asyncio.Future`
+object, which can be awaited on until a ``result`` is received.
 
 These options are:
 
-* ``block``: The default behaviour is that :meth:`~slixmpp.stanza.iq.Iq.send()`
-  will block until a response is received and the response stanza will be the
-  return value. Setting ``block`` to ``False`` will cause the call to return
-  immediately. In which case, you will need to arrange some way to capture
-  the response stanza if you need it.
-
 * ``timeout``: When using the blocking behaviour, the call will eventually
   timeout with an error. The default timeout is 30 seconds, but this may
   be overidden two ways. To change the timeout globally, set:
@@ -79,28 +77,33 @@ These options are:
 
 * ``callback``: When not using a blocking call, using the ``callback``
   argument is a simple way to register a handler that will execute
-  whenever a response is finally received. Using this method, there
+  whenever a response is finally received.
-  is no timeout limit. In case you need to remove the callback, the
-  name of the newly created callback is returned.
 
     .. code-block:: python
 
-       cb_name = iq.send(callback=self.a_callback)
+       iq.send(callback=self.a_callback)
 
-       # ... later if we need to cancel
+* ``timeout_callback``: A callback to execute when the provided
-       self.remove_handler(cb_name)
+  ``timeout`` is reached before an answer is received.
 
-Properly working with :class:`~slixmpp.stanza.iq.Iq` stanzas requires
+
+.. note::
+
+    Both ``callback`` and ``timeout_callback`` can be effectively
+    replaced using ``await``, and standard exception handling
+    (see below), which provide a more linear and readable workflow.
+
+Properly working with :class:`~slixmpp.stanza.Iq` stanzas requires
 handling the intended, normal flow, error responses, and timed out
 requests. To make this easier, two exceptions may be thrown by
-:meth:`~slixmpp.stanza.iq.Iq.send()`: :exc:`~slixmpp.exceptions.IqError`
+:meth:`~slixmpp.stanza.Iq.send()`: :exc:`~slixmpp.exceptions.IqError`
 and :exc:`~slixmpp.exceptions.IqTimeout`. These exceptions only
 apply to the default, blocking calls.
 
 .. code-block:: python
 
     try:
-        resp = iq.send()
+        resp = await iq.send()
         # ... do stuff with expected Iq result
     except IqError as e:
         err_resp = e.iq
@@ -116,7 +119,7 @@ exception:
 .. code-block:: python
 
     try:
-        resp = iq.send()
+        resp = await iq.send()
     except XMPPError:
         # ... Don't care about the response
         pass
@@ -126,7 +129,7 @@ Advanced Use
 
 Going beyond the basics provided by Slixmpp requires building at least a
 rudimentary Slixmpp plugin to create a :term:`stanza object` for
-interfacting with the :class:`~slixmpp.stanza.iq.Iq` payload.
+interfacting with the :class:`~slixmpp.stanza.Iq` payload.
 
 .. seealso::
 
@@ -135,13 +138,13 @@ interfacting with the :class:`~slixmpp.stanza.iq.Iq` payload.
     * :ref:`using-handlers-matchers`
 
 
-The typical way to respond to :class:`~slixmpp.stanza.iq.Iq` requests is
+The typical way to respond to :class:`~slixmpp.stanza.Iq` requests is
 to register stream handlers. As an example, suppose we create a stanza class
 named ``CustomXEP`` which uses the XML element ``<query xmlns="custom-xep" />``,
 and has a :attr:`~slixmpp.xmlstream.stanzabase.ElementBase.plugin_attrib` value
 of ``custom_xep``.
 
-There are two types of incoming :class:`~slixmpp.stanza.iq.Iq` requests:
+There are two types of incoming :class:`~slixmpp.stanza.Iq` requests:
 ``get`` and ``set``. You can register a handler that will accept both and then
 filter by type as needed, as so: