gRPC instrumentation: client additions (#269)

The docs on metric labels suggests that they should probably be strings,
and all others I can find are strings, and so these ought to be also.
Otherwise, some of the exporters/processors have to handle things
specifically, and not all of these come out as nice as could be when you
`str()` them.

I've also made sure to use the `StatusCode` name, as that's the
interesting thing.

Finally, there's no need to report specifically that `error=false`, so
I've removed that tag.

CHANGELOG.md

@@ -76,6 +76,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#246](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/246))
 - Update TraceState to adhere to specs
   ([#276](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/276))
+- `opentelemetry-instrumentation-grpc` Updated client attributes, added tests, fixed examples, docs
+  ([#269](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/269))
 
 ### Removed
 - Remove Configuration

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

@@ -185,29 +185,33 @@ class GrpcInstrumentorClient(BaseInstrumentor):
 
     """
 
+    # Figures out which channel type we need to wrap
+    def _which_channel(self, kwargs):
+        # handle legacy argument
+        if "channel_type" in kwargs:
+            if kwargs.get("channel_type") == "secure":
+                return ("secure_channel",)
+            return ("insecure_channel",)
+
+        # handle modern arguments
+        types = []
+        for ctype in ("secure_channel", "insecure_channel"):
+            if kwargs.get(ctype, True):
+                types.append(ctype)
+
+        return tuple(types)
+
     def _instrument(self, **kwargs):
         exporter = kwargs.get("exporter", None)
         interval = kwargs.get("interval", 30)
-        if kwargs.get("channel_type") == "secure":
+        for ctype in self._which_channel(kwargs):
             _wrap(
-                "grpc",
-                "secure_channel",
-                partial(self.wrapper_fn, exporter, interval),
-            )
-
-        else:
-            _wrap(
-                "grpc",
-                "insecure_channel",
-                partial(self.wrapper_fn, exporter, interval),
+                "grpc", ctype, partial(self.wrapper_fn, exporter, interval),
             )
 
     def _uninstrument(self, **kwargs):
-        if kwargs.get("channel_type") == "secure":
-            unwrap(grpc, "secure_channel")
-
-        else:
-            unwrap(grpc, "insecure_channel")
+        for ctype in self._which_channel(kwargs):
+            unwrap(grpc, ctype)
 
     def wrapper_fn(
         self, exporter, interval, original_func, instance, args, kwargs

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

@@ -102,8 +102,16 @@ class OpenTelemetryClientInterceptor(
         )
 
     def _start_span(self, method):
+        service, meth = method.lstrip("/").split("/", 1)
+        attributes = {
+            "rpc.system": "grpc",
+            "rpc.grpc.status_code": grpc.StatusCode.OK.value[0],
+            "rpc.method": meth,
+            "rpc.service": service,
+        }
+
         return self._tracer.start_as_current_span(
-            name=method, kind=trace.SpanKind.CLIENT
+            name=method, kind=trace.SpanKind.CLIENT, attributes=attributes
         )
 
     # pylint:disable=no-self-use
@@ -133,6 +141,7 @@ class OpenTelemetryClientInterceptor(
             self._metrics_recorder.record_bytes_in(
                 response.ByteSize(), client_info.full_method
             )
+
         return result
 
     def _start_guarded_span(self, *args, **kwargs):
@@ -175,11 +184,14 @@ class OpenTelemetryClientInterceptor(
 
                 try:
                     result = invoker(request, metadata)
-                except grpc.RpcError:
+                except grpc.RpcError as err:
                     guarded_span.generated_span.set_status(
                         Status(StatusCode.ERROR)
                     )
-                    raise
+                    guarded_span.generated_span.set_attribute(
+                        "rpc.grpc.status_code", err.code().value[0]
+                    )
+                    raise err
 
                 return self._trace_result(
                     guarded_span, rpc_info, result, client_info
@@ -230,9 +242,12 @@ class OpenTelemetryClientInterceptor(
                                 response.ByteSize(), client_info.full_method
                             )
                         yield response
-                except grpc.RpcError:
+                except grpc.RpcError as err:
                     span.set_status(Status(StatusCode.ERROR))
-                    raise
+                    span.set_attribute(
+                        "rpc.grpc.status_code", err.code().value[0]
+                    )
+                    raise err
 
     def intercept_stream(
         self, request_or_iterator, metadata, client_info, invoker
@@ -268,11 +283,14 @@ class OpenTelemetryClientInterceptor(
 
                 try:
                     result = invoker(request_or_iterator, metadata)
-                except grpc.RpcError:
+                except grpc.RpcError as err:
                     guarded_span.generated_span.set_status(
                         Status(StatusCode.ERROR)
                     )
-                    raise
+                    guarded_span.generated_span.set_attribute(
+                        "rpc.grpc.status_code", err.code().value[0],
+                    )
+                    raise err
 
                 return self._trace_result(
                     guarded_span, rpc_info, result, client_info

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

@@ -72,33 +72,32 @@ class TimedMetricRecorder:
 
     def record_bytes_in(self, bytes_in, method):
         if self._meter:
-            labels = {"method": method}
+            labels = {"rpc.method": method}
             self._bytes_in.add(bytes_in, labels)
 
     def record_bytes_out(self, bytes_out, method):
         if self._meter:
-            labels = {"method": method}
+            labels = {"rpc.method": method}
             self._bytes_out.add(bytes_out, labels)
 
     @contextmanager
     def record_latency(self, method):
         start_time = time()
         labels = {
-            "method": method,
-            "status_code": grpc.StatusCode.OK,  # pylint:disable=no-member
+            "rpc.method": method,
+            "rpc.system": "grpc",
+            "rpc.grpc.status_code": grpc.StatusCode.OK.name,
         }
         try:
             yield labels
         except grpc.RpcError as exc:  # pylint:disable=no-member
             if self._meter:
                 # pylint: disable=no-member
-                labels["status_code"] = exc.code()
+                labels["rpc.grpc.status_code"] = exc.code().name
                 self._error_count.add(1, labels)
-                labels["error"] = True
+                labels["error"] = "true"
             raise
         finally:
             if self._meter:
-                if "error" not in labels:
-                    labels["error"] = False
                 elapsed_time = (time() - start_time) * 1000
                 self._duration.record(elapsed_time, labels)

instrumentation/opentelemetry-instrumentation-grpc/tests/test_client_interceptor.py

@@ -73,21 +73,21 @@ class TestClientProto(TestBase):
 
         self.assertIsNotNone(bytes_out)
         self.assertEqual(bytes_out.instrument.name, "grpcio/client/bytes_out")
-        self.assertEqual(bytes_out.labels, (("method", method),))
+        self.assertEqual(bytes_out.labels, (("rpc.method", method),))
 
         self.assertIsNotNone(bytes_in)
         self.assertEqual(bytes_in.instrument.name, "grpcio/client/bytes_in")
-        self.assertEqual(bytes_in.labels, (("method", method),))
+        self.assertEqual(bytes_in.labels, (("rpc.method", method),))
 
         self.assertIsNotNone(duration)
         self.assertEqual(duration.instrument.name, "grpcio/client/duration")
-        self.assertEqual(
-            duration.labels,
-            (
-                ("error", False),
-                ("method", method),
-                ("status_code", grpc.StatusCode.OK),
-            ),
+        self.assertSequenceEqual(
+            sorted(duration.labels),
+            [
+                ("rpc.grpc.status_code", grpc.StatusCode.OK.name),
+                ("rpc.method", method),
+                ("rpc.system", "grpc"),
+            ],
         )
 
         self.assertEqual(type(bytes_out.aggregator), SumAggregator)
@@ -116,6 +116,16 @@ class TestClientProto(TestBase):
 
         self._verify_success_records(8, 8, "/GRPCTestServer/SimpleMethod")
 
+        self.assert_span_has_attributes(
+            span,
+            {
+                "rpc.method": "SimpleMethod",
+                "rpc.service": "GRPCTestServer",
+                "rpc.system": "grpc",
+                "rpc.grpc.status_code": grpc.StatusCode.OK.value[0],
+            },
+        )
+
     def test_unary_stream(self):
         server_streaming_method(self._stub)
         spans = self.memory_exporter.get_finished_spans()
@@ -134,6 +144,16 @@ class TestClientProto(TestBase):
             8, 40, "/GRPCTestServer/ServerStreamingMethod"
         )
 
+        self.assert_span_has_attributes(
+            span,
+            {
+                "rpc.method": "ServerStreamingMethod",
+                "rpc.service": "GRPCTestServer",
+                "rpc.system": "grpc",
+                "rpc.grpc.status_code": grpc.StatusCode.OK.value[0],
+            },
+        )
+
     def test_stream_unary(self):
         client_streaming_method(self._stub)
         spans = self.memory_exporter.get_finished_spans()
@@ -152,6 +172,16 @@ class TestClientProto(TestBase):
             40, 8, "/GRPCTestServer/ClientStreamingMethod"
         )
 
+        self.assert_span_has_attributes(
+            span,
+            {
+                "rpc.method": "ClientStreamingMethod",
+                "rpc.service": "GRPCTestServer",
+                "rpc.system": "grpc",
+                "rpc.grpc.status_code": grpc.StatusCode.OK.value[0],
+            },
+        )
+
     def test_stream_stream(self):
         bidirectional_streaming_method(self._stub)
         spans = self.memory_exporter.get_finished_spans()
@@ -172,6 +202,16 @@ class TestClientProto(TestBase):
             40, 40, "/GRPCTestServer/BidirectionalStreamingMethod"
         )
 
+        self.assert_span_has_attributes(
+            span,
+            {
+                "rpc.method": "BidirectionalStreamingMethod",
+                "rpc.service": "GRPCTestServer",
+                "rpc.system": "grpc",
+                "rpc.grpc.status_code": grpc.StatusCode.OK.value[0],
+            },
+        )
+
     def _verify_error_records(self, method):
         # pylint: disable=protected-access,no-member
         self.channel._interceptor.controller.tick()
@@ -195,21 +235,33 @@ class TestClientProto(TestBase):
         self.assertIsNotNone(duration)
 
         self.assertEqual(errors.instrument.name, "grpcio/client/errors")
-        self.assertEqual(
-            errors.labels,
-            (
-                ("method", method),
-                ("status_code", grpc.StatusCode.INVALID_ARGUMENT),
+        self.assertSequenceEqual(
+            sorted(errors.labels),
+            sorted(
+                (
+                    (
+                        "rpc.grpc.status_code",
+                        grpc.StatusCode.INVALID_ARGUMENT.name,
+                    ),
+                    ("rpc.method", method),
+                    ("rpc.system", "grpc"),
+                )
             ),
         )
         self.assertEqual(errors.aggregator.checkpoint, 1)
 
-        self.assertEqual(
-            duration.labels,
-            (
-                ("error", True),
-                ("method", method),
-                ("status_code", grpc.StatusCode.INVALID_ARGUMENT),
+        self.assertSequenceEqual(
+            sorted(duration.labels),
+            sorted(
+                (
+                    ("error", "true"),
+                    ("rpc.method", method),
+                    ("rpc.system", "grpc"),
+                    (
+                        "rpc.grpc.status_code",
+                        grpc.StatusCode.INVALID_ARGUMENT.name,
+                    ),
+                )
             ),
         )