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gRPC AsyncIO API
================

.. module:: grpc.aio

Overview
--------

gRPC AsyncIO API is the **new version** of gRPC Python whose architecture is
tailored to AsyncIO. Underlying, it utilizes the same C-extension, gRPC C-Core,
as existing stack, and it replaces all gRPC IO operations with methods provided
by the AsyncIO library.

This API is stable. Feel free to open issues on our GitHub repo
`grpc/grpc <https://github.com/grpc/grpc>`_ for bugs or suggestions.

The design doc can be found here as `gRFC <https://github.com/grpc/proposal/pull/155>`_.


Caveats
-------

gRPC Async API objects may only be used on the thread on which they were
created. AsyncIO doesn't provide thread safety for most of its APIs.


Blocking Code in AsyncIO
------------------------

Making blocking function calls in coroutines or in the thread running event
loop will block the event loop, potentially starving all RPCs in the process.
Refer to the Python language documentation on AsyncIO for more details (`running-blocking-code <https://docs.python.org/3/library/asyncio-dev.html#running-blocking-code>`_).


Module Contents
---------------


Create Channel
^^^^^^^^^^^^^^

Channels are the abstraction of clients, where most of networking logic
happens, for example, managing one or more underlying connections, name
resolution, load balancing, flow control, etc.. If you are using ProtoBuf,
Channel objects works best when further encapsulate into stub objects, then the
application can invoke remote functions as if they are local functions.

.. autofunction:: insecure_channel
.. autofunction:: secure_channel


Channel Object
^^^^^^^^^^^^^^

.. autoclass:: Channel


Create Server
^^^^^^^^^^^^^

.. autofunction:: server


Server Object
^^^^^^^^^^^^^

.. autoclass:: Server


gRPC Exceptions
^^^^^^^^^^^^^^^

.. autoexception:: BaseError
.. autoexception:: UsageError
.. autoexception:: AbortError
.. autoexception:: InternalError
.. autoexception:: AioRpcError

gRPC Metadata
^^^^^^^^^^^^^

.. autoclass:: Metadata


RPC Context
^^^^^^^^^^^^^^^^^^^^

.. autoclass:: RpcContext


Client-Side Context
^^^^^^^^^^^^^^^^^^^^^^^

.. autoclass:: Call
.. autoclass:: UnaryUnaryCall
.. autoclass:: UnaryStreamCall
.. autoclass:: StreamUnaryCall
.. autoclass:: StreamStreamCall


Server-Side Context
^^^^^^^^^^^^^^^^^^^^^^^

.. autoclass:: ServicerContext


Client-Side Interceptor
^^^^^^^^^^^^^^^^^^^^^^^

.. autoclass:: ClientCallDetails
.. autoclass:: InterceptedUnaryUnaryCall
.. autoclass:: ClientInterceptor
.. autoclass:: UnaryUnaryClientInterceptor
.. autoclass:: UnaryStreamClientInterceptor
.. autoclass:: StreamUnaryClientInterceptor
.. autoclass:: StreamStreamClientInterceptor

Server-Side Interceptor
^^^^^^^^^^^^^^^^^^^^^^^

.. autoclass:: ServerInterceptor


Multi-Callable Interfaces
^^^^^^^^^^^^^^^^^^^^^^^^^

.. autoclass:: UnaryUnaryMultiCallable
.. autoclass:: UnaryStreamMultiCallable()
.. autoclass:: StreamUnaryMultiCallable()
.. autoclass:: StreamStreamMultiCallable()