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Diffstat (limited to 'tests/metrics/test_metrics.py')
| -rw-r--r-- | tests/metrics/test_metrics.py | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/tests/metrics/test_metrics.py b/tests/metrics/test_metrics.py new file mode 100644 index 0000000000..bddc4228bc --- /dev/null +++ b/tests/metrics/test_metrics.py @@ -0,0 +1,206 @@ +# Copyright 2018 New Vector Ltd +# Copyright 2019 Matrix.org Foundation C.I.C. +# +# 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_extensions import Protocol + +try: + from importlib import metadata +except ImportError: + import importlib_metadata as metadata # type: ignore[no-redef] + +from unittest.mock import patch + +from pkg_resources import parse_version + +from synapse.app._base import _set_prometheus_client_use_created_metrics +from synapse.metrics import REGISTRY, InFlightGauge, generate_latest +from synapse.util.caches.deferred_cache import DeferredCache + +from tests import unittest + + +def get_sample_labels_value(sample): + """Extract the labels and values of a sample. + + prometheus_client 0.5 changed the sample type to a named tuple with more + members than the plain tuple had in 0.4 and earlier. This function can + extract the labels and value from the sample for both sample types. + + Args: + sample: The sample to get the labels and value from. + Returns: + A tuple of (labels, value) from the sample. + """ + + # If the sample has a labels and value attribute, use those. + if hasattr(sample, "labels") and hasattr(sample, "value"): + return sample.labels, sample.value + # Otherwise fall back to treating it as a plain 3 tuple. + else: + _, labels, value = sample + return labels, value + + +class TestMauLimit(unittest.TestCase): + def test_basic(self): + class MetricEntry(Protocol): + foo: int + bar: int + + gauge: InFlightGauge[MetricEntry] = InFlightGauge( + "test1", "", labels=["test_label"], sub_metrics=["foo", "bar"] + ) + + def handle1(metrics): + metrics.foo += 2 + metrics.bar = max(metrics.bar, 5) + + def handle2(metrics): + metrics.foo += 3 + metrics.bar = max(metrics.bar, 7) + + gauge.register(("key1",), handle1) + + self.assert_dict( + { + "test1_total": {("key1",): 1}, + "test1_foo": {("key1",): 2}, + "test1_bar": {("key1",): 5}, + }, + self.get_metrics_from_gauge(gauge), + ) + + gauge.unregister(("key1",), handle1) + + self.assert_dict( + { + "test1_total": {("key1",): 0}, + "test1_foo": {("key1",): 0}, + "test1_bar": {("key1",): 0}, + }, + self.get_metrics_from_gauge(gauge), + ) + + gauge.register(("key1",), handle1) + gauge.register(("key2",), handle2) + + self.assert_dict( + { + "test1_total": {("key1",): 1, ("key2",): 1}, + "test1_foo": {("key1",): 2, ("key2",): 3}, + "test1_bar": {("key1",): 5, ("key2",): 7}, + }, + self.get_metrics_from_gauge(gauge), + ) + + gauge.unregister(("key2",), handle2) + gauge.register(("key1",), handle2) + + self.assert_dict( + { + "test1_total": {("key1",): 2, ("key2",): 0}, + "test1_foo": {("key1",): 5, ("key2",): 0}, + "test1_bar": {("key1",): 7, ("key2",): 0}, + }, + self.get_metrics_from_gauge(gauge), + ) + + def get_metrics_from_gauge(self, gauge): + results = {} + + for r in gauge.collect(): + results[r.name] = { + tuple(labels[x] for x in gauge.labels): value + for labels, value in map(get_sample_labels_value, r.samples) + } + + return results + + +class BuildInfoTests(unittest.TestCase): + def test_get_build(self): + """ + The synapse_build_info metric reports the OS version, Python version, + and Synapse version. + """ + items = list( + filter( + lambda x: b"synapse_build_info{" in x, + generate_latest(REGISTRY).split(b"\n"), + ) + ) + self.assertEqual(len(items), 1) + self.assertTrue(b"osversion=" in items[0]) + self.assertTrue(b"pythonversion=" in items[0]) + self.assertTrue(b"version=" in items[0]) + + +class CacheMetricsTests(unittest.HomeserverTestCase): + def test_cache_metric(self): + """ + Caches produce metrics reflecting their state when scraped. + """ + CACHE_NAME = "cache_metrics_test_fgjkbdfg" + cache: DeferredCache[str, str] = DeferredCache(CACHE_NAME, max_entries=777) + + items = { + x.split(b"{")[0].decode("ascii"): x.split(b" ")[1].decode("ascii") + for x in filter( + lambda x: b"cache_metrics_test_fgjkbdfg" in x, + generate_latest(REGISTRY).split(b"\n"), + ) + } + + self.assertEqual(items["synapse_util_caches_cache_size"], "0.0") + self.assertEqual(items["synapse_util_caches_cache_max_size"], "777.0") + + cache.prefill("1", "hi") + + items = { + x.split(b"{")[0].decode("ascii"): x.split(b" ")[1].decode("ascii") + for x in filter( + lambda x: b"cache_metrics_test_fgjkbdfg" in x, + generate_latest(REGISTRY).split(b"\n"), + ) + } + + self.assertEqual(items["synapse_util_caches_cache_size"], "1.0") + self.assertEqual(items["synapse_util_caches_cache_max_size"], "777.0") + + +class PrometheusMetricsHackTestCase(unittest.HomeserverTestCase): + if parse_version(metadata.version("prometheus_client")) < parse_version("0.14.0"): + skip = "prometheus-client too old" + + def test_created_metrics_disabled(self) -> None: + """ + Tests that a brittle hack, to disable `_created` metrics, works. + This involves poking at the internals of prometheus-client. + It's not the end of the world if this doesn't work. + + This test gives us a way to notice if prometheus-client changes + their internals. + """ + import prometheus_client.metrics + + PRIVATE_FLAG_NAME = "_use_created" + + # By default, the pesky `_created` metrics are enabled. + # Check this assumption is still valid. + self.assertTrue(getattr(prometheus_client.metrics, PRIVATE_FLAG_NAME)) + + with patch("prometheus_client.metrics") as mock: + setattr(mock, PRIVATE_FLAG_NAME, True) + _set_prometheus_client_use_created_metrics(False) + self.assertFalse(getattr(mock, PRIVATE_FLAG_NAME, False)) |