Implement SynchronousMeasurementConsumer (open-telemetry#2388)

opentelemetry-sdk/src/opentelemetry/sdk/_metrics/__init__.py

@@ -45,6 +45,7 @@
     SynchronousMeasurementConsumer,
 )
 from opentelemetry.sdk._metrics.metric_reader import MetricReader
+from opentelemetry.sdk._metrics.sdk_configuration import SdkConfiguration
 from opentelemetry.sdk.resources import Resource
 from opentelemetry.sdk.util.instrumentation import InstrumentationInfo
 
@@ -156,19 +157,22 @@ def __init__(
         self._lock = Lock()
         self._meter_lock = Lock()
         self._atexit_handler = None
-
-        self._measurement_consumer = SynchronousMeasurementConsumer()
+        self._sdk_config = SdkConfiguration(
+            resource=resource, metric_readers=metric_readers
+        )
+        self._measurement_consumer = SynchronousMeasurementConsumer(
+            sdk_config=self._sdk_config
+        )
 
         if shutdown_on_exit:
             self._atexit_handler = register(self.shutdown)
 
         self._meters = {}
         self._metric_readers = metric_readers
 
-        for metric_reader in self._metric_readers:
+        for metric_reader in self._sdk_config.metric_readers:
             metric_reader._register_measurement_consumer(self)
 
-        self._resource = resource
         self._shutdown = False
 
     def force_flush(self) -> bool:
@@ -177,7 +181,7 @@ def force_flush(self) -> bool:
 
         metric_reader_result = True
 
-        for metric_reader in self._metric_readers:
+        for metric_reader in self._sdk_config.metric_readers:
             metric_reader_result = (
                 metric_reader_result and metric_reader.force_flush()
             )
@@ -196,7 +200,7 @@ def shutdown(self):
 
         result = True
 
-        for metric_reader in self._metric_readers:
+        for metric_reader in self._sdk_config.metric_readers:
             result = result and metric_reader.shutdown()
 
             if not result:

opentelemetry-sdk/src/opentelemetry/sdk/_metrics/measurement_consumer.py

@@ -13,12 +13,17 @@
 # limitations under the License.
 
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING, Iterable
+from threading import Lock
+from typing import TYPE_CHECKING, Iterable, List, Mapping
 
 from opentelemetry.sdk._metrics.aggregation import AggregationTemporality
 from opentelemetry.sdk._metrics.measurement import Measurement
 from opentelemetry.sdk._metrics.metric_reader import MetricReader
+from opentelemetry.sdk._metrics.metric_reader_storage import (
+    MetricReaderStorage,
+)
 from opentelemetry.sdk._metrics.point import Metric
+from opentelemetry.sdk._metrics.sdk_configuration import SdkConfiguration
 
 if TYPE_CHECKING:
     from opentelemetry.sdk._metrics.instrument import _Asynchronous
@@ -41,15 +46,31 @@ def collect(
 
 
 class SynchronousMeasurementConsumer(MeasurementConsumer):
+    def __init__(self, sdk_config: SdkConfiguration) -> None:
+        self._lock = Lock()
+        self._sdk_config = sdk_config
+        # should never be mutated
+        self._reader_storages: Mapping[MetricReader, MetricReaderStorage] = {
+            reader: MetricReaderStorage(sdk_config)
+            for reader in sdk_config.metric_readers
+        }
+        self._async_instruments: List["_Asynchronous"] = []
+
     def consume_measurement(self, measurement: Measurement) -> None:
-        pass
+        for reader_storage in self._reader_storages.values():
+            reader_storage.consume_measurement(measurement)
 
     def register_asynchronous_instrument(
         self, instrument: "_Asynchronous"
     ) -> None:
-        pass
+        with self._lock:
+            self._async_instruments.append(instrument)
 
     def collect(
         self, metric_reader: MetricReader, temporality: AggregationTemporality
     ) -> Iterable[Metric]:
-        pass
+        with self._lock:
+            for async_instrument in self._async_instruments:
+                for measurement in async_instrument.callback():
+                    self.consume_measurement(measurement)
+        return self._reader_storages[metric_reader].collect(temporality)

opentelemetry-sdk/src/opentelemetry/sdk/_metrics/metric_reader_storage.py

@@ -0,0 +1,34 @@
+# 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 typing import Iterable
+
+from opentelemetry.sdk._metrics.aggregation import AggregationTemporality
+from opentelemetry.sdk._metrics.measurement import Measurement
+from opentelemetry.sdk._metrics.point import Metric
+from opentelemetry.sdk._metrics.sdk_configuration import SdkConfiguration
+
+
+# TODO: #2378
+class MetricReaderStorage:
+    """The SDK's storage for a given reader"""
+
+    def __init__(self, sdk_config: SdkConfiguration) -> None:
+        pass
+
+    def consume_measurement(self, measurement: Measurement) -> None:
+        pass
+
+    def collect(self, temporality: AggregationTemporality) -> Iterable[Metric]:
+        pass

opentelemetry-sdk/src/opentelemetry/sdk/_metrics/sdk_configuration.py

@@ -0,0 +1,13 @@
+from dataclasses import dataclass
+from typing import Sequence
+
+from opentelemetry.sdk._metrics.metric_reader import MetricReader
+from opentelemetry.sdk.resources import Resource
+
+
+@dataclass
+class SdkConfiguration:
+    resource: Resource
+    # TODO: once views are added
+    # views: Sequence[View]
+    metric_readers: Sequence[MetricReader]

opentelemetry-sdk/tests/metrics/test_measurement_consumer.py

@@ -13,87 +13,78 @@
 # limitations under the License.
 
 from unittest import TestCase
-from unittest.mock import Mock, patch
+from unittest.mock import MagicMock, Mock, patch
 
-from opentelemetry.sdk._metrics import MeterProvider
 from opentelemetry.sdk._metrics.measurement_consumer import (
     MeasurementConsumer,
     SynchronousMeasurementConsumer,
 )
+from opentelemetry.sdk._metrics.point import AggregationTemporality
+from opentelemetry.sdk._metrics.sdk_configuration import SdkConfiguration
 
 
+@patch("opentelemetry.sdk._metrics.measurement_consumer.MetricReaderStorage")
 class TestSynchronousMeasurementConsumer(TestCase):
-    def test_parent(self):
+    def test_parent(self, _):
 
         self.assertIsInstance(
-            SynchronousMeasurementConsumer(), MeasurementConsumer
+            SynchronousMeasurementConsumer(MagicMock()), MeasurementConsumer
         )
 
-    @patch("opentelemetry.sdk._metrics.SynchronousMeasurementConsumer")
-    def test_measurement_consumer_class(
-        self, mock_serial_measurement_consumer
-    ):
-        MeterProvider()
-
-        mock_serial_measurement_consumer.assert_called()
-
-    @patch("opentelemetry.sdk._metrics.SynchronousMeasurementConsumer")
-    def test_register_asynchronous_instrument(
-        self, mock_serial_measurement_consumer
-    ):
-
-        meter_provider = MeterProvider()
-
-        meter_provider._measurement_consumer.register_asynchronous_instrument.assert_called_with(
-            meter_provider.get_meter("name").create_observable_counter(
-                "name", Mock()
-            )
-        )
-        meter_provider._measurement_consumer.register_asynchronous_instrument.assert_called_with(
-            meter_provider.get_meter("name").create_observable_up_down_counter(
-                "name", Mock()
-            )
-        )
-        meter_provider._measurement_consumer.register_asynchronous_instrument.assert_called_with(
-            meter_provider.get_meter("name").create_observable_gauge(
-                "name", Mock()
-            )
+    def test_creates_metric_reader_storages(self, MockMetricReaderStorage):
+        """It should create one MetricReaderStorage per metric reader passed in the SdkConfiguration"""
+        reader_mocks = [Mock() for _ in range(5)]
+        SynchronousMeasurementConsumer(
+            SdkConfiguration(resource=Mock(), metric_readers=reader_mocks)
         )
+        self.assertEqual(len(MockMetricReaderStorage.mock_calls), 5)
 
-    @patch("opentelemetry.sdk._metrics.SynchronousMeasurementConsumer")
-    def test_consume_measurement_counter(
-        self, mock_serial_measurement_consumer
+    def test_measurements_passed_to_each_reader_storage(
+        self, MockMetricReaderStorage
     ):
+        reader_mocks = [Mock() for _ in range(5)]
+        reader_storage_mocks = [Mock() for _ in range(5)]
+        MockMetricReaderStorage.side_effect = reader_storage_mocks
 
-        meter_provider = MeterProvider()
-        counter = meter_provider.get_meter("name").create_counter("name")
-
-        counter.add(1)
-
-        meter_provider._measurement_consumer.consume_measurement.assert_called()
-
-    @patch("opentelemetry.sdk._metrics.SynchronousMeasurementConsumer")
-    def test_consume_measurement_up_down_counter(
-        self, mock_serial_measurement_consumer
-    ):
-
-        meter_provider = MeterProvider()
-        counter = meter_provider.get_meter("name").create_up_down_counter(
-            "name"
+        consumer = SynchronousMeasurementConsumer(
+            SdkConfiguration(resource=Mock(), metric_readers=reader_mocks)
         )
+        measurement_mock = Mock()
+        consumer.consume_measurement(measurement_mock)
 
-        counter.add(1)
+        for rs_mock in reader_storage_mocks:
+            rs_mock.consume_measurement.assert_called_once_with(
+                measurement_mock
+            )
 
-        meter_provider._measurement_consumer.consume_measurement.assert_called()
+    def test_collect_passed_to_reader_stage(self, MockMetricReaderStorage):
+        """Its collect() method should defer to the underlying MetricReaderStorage"""
+        reader_mocks = [Mock() for _ in range(5)]
+        reader_storage_mocks = [Mock() for _ in range(5)]
+        MockMetricReaderStorage.side_effect = reader_storage_mocks
 
-    @patch("opentelemetry.sdk._metrics.SynchronousMeasurementConsumer")
-    def test_consume_measurement_histogram(
-        self, mock_serial_measurement_consumer
-    ):
+        consumer = SynchronousMeasurementConsumer(
+            SdkConfiguration(resource=Mock(), metric_readers=reader_mocks)
+        )
+        for r_mock, rs_mock in zip(reader_mocks, reader_storage_mocks):
+            rs_mock.collect.assert_not_called()
+            consumer.collect(r_mock, AggregationTemporality.CUMULATIVE)
+            rs_mock.collect.assert_called_once_with(
+                AggregationTemporality.CUMULATIVE
+            )
 
-        meter_provider = MeterProvider()
-        counter = meter_provider.get_meter("name").create_histogram("name")
+    def test_collect_calls_async_instruments(self, _):
+        """Its collect() method should invoke async instruments"""
+        reader_mock = Mock()
+        consumer = SynchronousMeasurementConsumer(
+            SdkConfiguration(resource=Mock(), metric_readers=[reader_mock])
+        )
+        async_instrument_mocks = [MagicMock() for _ in range(5)]
+        for i_mock in async_instrument_mocks:
+            consumer.register_asynchronous_instrument(i_mock)
 
-        counter.record(1)
+        consumer.collect(reader_mock, AggregationTemporality.CUMULATIVE)
 
-        meter_provider._measurement_consumer.consume_measurement.assert_called()
+        # it should call async instruments
+        for i_mock in async_instrument_mocks:
+            i_mock.callback.assert_called_once()