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d56f48038a
`setup()` is run under the sentinel context manager, so we wrap the
initial update in a background process. Before this change, Synapse
would log two warnings on startup:
Starting db txn 'count_daily_users' from sentinel context
Starting db connection from sentinel context: metrics will be lost
Signed-off-by: Sean Quah <seanq@matrix.org>
82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
# Copyright 2022 The Matrix.org Foundation C.I.C
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import TYPE_CHECKING
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import attr
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from synapse.metrics.background_process_metrics import run_as_background_process
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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from prometheus_client import Gauge
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# Gauge to expose daily active users metrics
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current_dau_gauge = Gauge(
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"synapse_admin_daily_active_users",
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"Current daily active users count",
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)
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@attr.s(auto_attribs=True)
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class CommonUsageMetrics:
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"""Usage metrics shared between the phone home stats and the prometheus exporter."""
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daily_active_users: int
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class CommonUsageMetricsManager:
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"""Collects common usage metrics."""
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def __init__(self, hs: "HomeServer") -> None:
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self._store = hs.get_datastores().main
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self._clock = hs.get_clock()
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async def get_metrics(self) -> CommonUsageMetrics:
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"""Get the CommonUsageMetrics object. If no collection has happened yet, do it
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before returning the metrics.
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Returns:
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The CommonUsageMetrics object to read common metrics from.
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"""
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return await self._collect()
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async def setup(self) -> None:
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"""Keep the gauges for common usage metrics up to date."""
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run_as_background_process(
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desc="common_usage_metrics_update_gauges", func=self._update_gauges
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)
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self._clock.looping_call(
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run_as_background_process,
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5 * 60 * 1000,
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desc="common_usage_metrics_update_gauges",
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func=self._update_gauges,
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)
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async def _collect(self) -> CommonUsageMetrics:
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"""Collect the common metrics and either create the CommonUsageMetrics object to
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use if it doesn't exist yet, or update it.
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"""
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dau_count = await self._store.count_daily_users()
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return CommonUsageMetrics(
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daily_active_users=dau_count,
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)
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async def _update_gauges(self) -> None:
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"""Update the Prometheus gauges."""
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metrics = await self._collect()
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current_dau_gauge.set(float(metrics.daily_active_users))
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