Add grpc.aio client-side support

This adds support for instrumenting grpc.aio channels with spans and
telemetry. The instrumentation needed to work differently that the
standard grpc channel support but is functionally the same.

instrumentation/opentelemetry-instrumentation-grpc/src/opentelemetry/instrumentation/grpc/__init__.py

@@ -118,6 +118,59 @@ def serve():
     server = grpc.server(futures.ThreadPoolExecutor(),
                          interceptors = [server_interceptor()])
 
+Usage Aio Client
+------------
+.. code-block:: python
+
+    import logging
+    import asyncio
+
+    import grpc
+
+    from opentelemetry import trace
+    from opentelemetry.instrumentation.grpc import GrpcAioInstrumentorClient
+    from opentelemetry.sdk.trace import TracerProvider
+    from opentelemetry.sdk.trace.export import (
+        ConsoleSpanExporter,
+        SimpleSpanProcessor,
+    )
+
+    try:
+        from .gen import helloworld_pb2, helloworld_pb2_grpc
+    except ImportError:
+        from gen import helloworld_pb2, helloworld_pb2_grpc
+
+    trace.set_tracer_provider(TracerProvider())
+    trace.get_tracer_provider().add_span_processor(
+        SimpleSpanProcessor(ConsoleSpanExporter())
+    )
+
+    grpc_client_instrumentor = GrpcAioInstrumentorClient()
+    grpc_client_instrumentor.instrument()
+
+    async def run():
+        with grpc.aio.insecure_channel("localhost:50051") as channel:
+
+            stub = helloworld_pb2_grpc.GreeterStub(channel)
+            response = await stub.SayHello(helloworld_pb2.HelloRequest(name="YOU"))
+
+        print("Greeter client received: " + response.message)
+
+
+    if __name__ == "__main__":
+        logging.basicConfig()
+        asyncio.run(run())
+
+You can also add the interceptor manually, rather than using
+:py:class:`~opentelemetry.instrumentation.grpc.GrpcAioInstrumentorClient`:
+
+.. code-block:: python
+
+    from opentelemetry.instrumentation.grpc import aio_client_interceptors
+
+    channel = grpc.aio.insecure_channel("localhost:12345", interceptors=aio_client_interceptors())
+
+
 Usage Aio Server
 ------------
 .. code-block:: python
@@ -321,6 +374,58 @@ def wrapper_fn(self, original_func, instance, args, kwargs):
         )
 
 
+class GrpcAioInstrumentorClient(BaseInstrumentor):
+    """
+    Globally instrument the grpc.aio client.
+
+    Usage::
+
+        grpc_aio_client_instrumentor = GrpcAioInstrumentorClient()
+        grpc_aio_client_instrumentor.instrument()
+
+    """
+
+    # pylint:disable=attribute-defined-outside-init, redefined-outer-name
+
+    def instrumentation_dependencies(self) -> Collection[str]:
+        return _instruments
+
+    def _add_interceptors(self, tracer_provider, kwargs):
+        if "interceptors" in kwargs and kwargs["interceptors"]:
+            kwargs["interceptors"] = (
+                aio_client_interceptors(tracer_provider=tracer_provider)
+                + kwargs["interceptors"]
+            )
+        else:
+            kwargs["interceptors"] = aio_client_interceptors(
+                tracer_provider=tracer_provider
+            )
+
+        return kwargs
+
+    def _instrument(self, **kwargs):
+        self._original_insecure = grpc.aio.insecure_channel
+        self._original_secure = grpc.aio.secure_channel
+        tracer_provider = kwargs.get("tracer_provider")
+
+        def insecure(*args, **kwargs):
+            kwargs = self._add_interceptors(tracer_provider, kwargs)
+
+            return self._original_insecure(*args, **kwargs)
+
+        def secure(*args, **kwargs):
+            kwargs = self._add_interceptors(tracer_provider, kwargs)
+
+            return self._original_secure(*args, **kwargs)
+
+        grpc.aio.insecure_channel = insecure
+        grpc.aio.secure_channel = secure
+
+    def _uninstrument(self, **kwargs):
+        grpc.aio.insecure_channel = self._original_insecure
+        grpc.aio.secure_channel = self._original_secure
+
+
 def client_interceptor(tracer_provider=None):
     """Create a gRPC client channel interceptor.
 
@@ -353,6 +458,27 @@ def server_interceptor(tracer_provider=None):
     return _server.OpenTelemetryServerInterceptor(tracer)
 
 
+def aio_client_interceptors(tracer_provider=None):
+    """Create a gRPC client channel interceptor.
+
+    Args:
+        tracer: The tracer to use to create client-side spans.
+
+    Returns:
+        An invocation-side interceptor object.
+    """
+    from . import _aio_client
+
+    tracer = trace.get_tracer(__name__, __version__, tracer_provider)
+
+    return [
+        _aio_client.UnaryUnaryAioClientInterceptor(tracer),
+        _aio_client.UnaryStreamAioClientInterceptor(tracer),
+        _aio_client.StreamUnaryAioClientInterceptor(tracer),
+        _aio_client.StreamStreamAioClientInterceptor(tracer),
+    ]
+
+
 def aio_server_interceptor(tracer_provider=None):
     """Create a gRPC aio server interceptor.
 

instrumentation/opentelemetry-instrumentation-grpc/src/opentelemetry/instrumentation/grpc/_aio_client.py

@@ -0,0 +1,219 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from collections import OrderedDict
+import functools
+
+import grpc
+from grpc.aio import ClientCallDetails
+
+from opentelemetry import context, trace
+from opentelemetry.semconv.trace import SpanAttributes
+from opentelemetry.propagate import inject
+from opentelemetry.instrumentation.utils import _SUPPRESS_INSTRUMENTATION_KEY
+from opentelemetry.instrumentation.grpc.version import __version__
+
+from opentelemetry.trace.status import Status, StatusCode
+
+from opentelemetry.instrumentation.grpc._client import (
+    OpenTelemetryClientInterceptor,
+    _carrier_setter,
+)
+
+
+def _unary_done_callback(span, code, details):
+    def callback(call):
+        try:
+            span.set_attribute(
+                SpanAttributes.RPC_GRPC_STATUS_CODE,
+                code.value[0],
+            )
+            if code != grpc.StatusCode.OK:
+                span.set_status(
+                    Status(
+                        status_code=StatusCode.ERROR,
+                        description=details,
+                    )
+                )
+        finally:
+            span.end()
+
+    return callback
+
+
+class _BaseAioClientInterceptor(OpenTelemetryClientInterceptor):
+    @staticmethod
+    def propagate_trace_in_details(client_call_details):
+        method = client_call_details.method.decode("utf-8")
+        metadata = client_call_details.metadata
+        if not metadata:
+            mutable_metadata = OrderedDict()
+        else:
+            mutable_metadata = OrderedDict(metadata)
+
+        inject(mutable_metadata, setter=_carrier_setter)
+        metadata = tuple(mutable_metadata.items())
+
+        return ClientCallDetails(
+            client_call_details.method,
+            client_call_details.timeout,
+            metadata,
+            client_call_details.credentials,
+            client_call_details.wait_for_ready,
+        )
+
+    @staticmethod
+    def add_error_details_to_span(span, exc):
+        if isinstance(exc, grpc.RpcError):
+            span.set_attribute(
+                SpanAttributes.RPC_GRPC_STATUS_CODE,
+                exc.code().value[0],
+            )
+        span.set_status(
+            Status(
+                status_code=StatusCode.ERROR,
+                description=f"{type(exc).__name__}: {exc}",
+            )
+        )
+        span.record_exception(exc)
+
+    async def _wrap_unary_response(self, continuation, span):
+        try:
+            call = await continuation()
+
+            # code and details are both coroutines that need to be await-ed,
+            # the callbacks added with add_done_callback do not allow async
+            # code so we need to get the code and details here then pass them
+            # to the callback.
+            code = await call.code()
+            details = await call.details()
+
+            call.add_done_callback(_unary_done_callback(span, code, details))
+
+            return call
+        except grpc.aio.AioRpcError as exc:
+            self.add_error_details_to_span(span, exc)
+            raise exc
+
+    async def _wrap_stream_response(self, span, call):
+        try:
+            async for response in call:
+                yield response
+        except Exception as exc:
+            self.add_error_details_to_span(span, exc)
+            raise exc
+        finally:
+            span.end()
+
+
+class UnaryUnaryAioClientInterceptor(
+    grpc.aio.UnaryUnaryClientInterceptor,
+    _BaseAioClientInterceptor,
+):
+    async def intercept_unary_unary(
+        self, continuation, client_call_details, request
+    ):
+        if context.get_value(_SUPPRESS_INSTRUMENTATION_KEY):
+            return await continuation(client_call_details, request)
+
+        method = client_call_details.method.decode("utf-8")
+        with self._start_span(
+            method,
+            end_on_exit=False,
+            record_exception=False,
+            set_status_on_exception=False,
+        ) as span:
+            new_details = self.propagate_trace_in_details(client_call_details)
+
+            continuation_with_args = functools.partial(
+                continuation, new_details, request
+            )
+            return await self._wrap_unary_response(
+                continuation_with_args, span
+            )
+
+
+class UnaryStreamAioClientInterceptor(
+    grpc.aio.UnaryStreamClientInterceptor,
+    _BaseAioClientInterceptor,
+):
+    async def intercept_unary_stream(
+        self, continuation, client_call_details, request
+    ):
+        if context.get_value(_SUPPRESS_INSTRUMENTATION_KEY):
+            return await continuation(client_call_details, request)
+
+        method = client_call_details.method.decode("utf-8")
+        with self._start_span(
+            method,
+            end_on_exit=False,
+            record_exception=False,
+            set_status_on_exception=False,
+        ) as span:
+            new_details = self.propagate_trace_in_details(client_call_details)
+
+            resp = await continuation(new_details, request)
+
+            return self._wrap_stream_response(span, resp)
+
+
+class StreamUnaryAioClientInterceptor(
+    grpc.aio.StreamUnaryClientInterceptor,
+    _BaseAioClientInterceptor,
+):
+    async def intercept_stream_unary(
+        self, continuation, client_call_details, request_iterator
+    ):
+        if context.get_value(_SUPPRESS_INSTRUMENTATION_KEY):
+            return await continuation(client_call_details, request_iterator)
+
+        method = client_call_details.method.decode("utf-8")
+        with self._start_span(
+            method,
+            end_on_exit=False,
+            record_exception=False,
+            set_status_on_exception=False,
+        ) as span:
+            new_details = self.propagate_trace_in_details(client_call_details)
+
+            continuation_with_args = functools.partial(
+                continuation, new_details, request_iterator
+            )
+            return await self._wrap_unary_response(
+                continuation_with_args, span
+            )
+
+
+class StreamStreamAioClientInterceptor(
+    grpc.aio.StreamStreamClientInterceptor,
+    _BaseAioClientInterceptor,
+):
+    async def intercept_stream_stream(
+        self, continuation, client_call_details, request_iterator
+    ):
+        if context.get_value(_SUPPRESS_INSTRUMENTATION_KEY):
+            return await continuation(client_call_details, request_iterator)
+
+        method = client_call_details.method.decode("utf-8")
+        with self._start_span(
+            method,
+            end_on_exit=False,
+            record_exception=False,
+            set_status_on_exception=False,
+        ) as span:
+            new_details = self.propagate_trace_in_details(client_call_details)
+
+            resp = await continuation(new_details, request_iterator)
+
+            return self._wrap_stream_response(span, resp)