mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-25 03:35:28 +00:00
241 lines
7.5 KiB
Python
241 lines
7.5 KiB
Python
# Copyright 2016 OpenMarket Ltd
|
|
#
|
|
# 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.
|
|
|
|
import logging
|
|
from functools import wraps
|
|
from types import TracebackType
|
|
from typing import Awaitable, Callable, Dict, Generator, Optional, Type, TypeVar
|
|
|
|
from prometheus_client import CollectorRegistry, Counter, Metric
|
|
from typing_extensions import Concatenate, ParamSpec, Protocol
|
|
|
|
from synapse.logging.context import (
|
|
ContextResourceUsage,
|
|
LoggingContext,
|
|
current_context,
|
|
)
|
|
from synapse.metrics import InFlightGauge
|
|
from synapse.util import Clock
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
block_counter = Counter("synapse_util_metrics_block_count", "", ["block_name"])
|
|
|
|
block_timer = Counter("synapse_util_metrics_block_time_seconds", "", ["block_name"])
|
|
|
|
block_ru_utime = Counter(
|
|
"synapse_util_metrics_block_ru_utime_seconds", "", ["block_name"]
|
|
)
|
|
|
|
block_ru_stime = Counter(
|
|
"synapse_util_metrics_block_ru_stime_seconds", "", ["block_name"]
|
|
)
|
|
|
|
block_db_txn_count = Counter(
|
|
"synapse_util_metrics_block_db_txn_count", "", ["block_name"]
|
|
)
|
|
|
|
# seconds spent waiting for db txns, excluding scheduling time, in this block
|
|
block_db_txn_duration = Counter(
|
|
"synapse_util_metrics_block_db_txn_duration_seconds", "", ["block_name"]
|
|
)
|
|
|
|
# seconds spent waiting for a db connection, in this block
|
|
block_db_sched_duration = Counter(
|
|
"synapse_util_metrics_block_db_sched_duration_seconds", "", ["block_name"]
|
|
)
|
|
|
|
|
|
# This is dynamically created in InFlightGauge.__init__.
|
|
class _InFlightMetric(Protocol):
|
|
real_time_max: float
|
|
real_time_sum: float
|
|
|
|
|
|
# Tracks the number of blocks currently active
|
|
in_flight: InFlightGauge[_InFlightMetric] = InFlightGauge(
|
|
"synapse_util_metrics_block_in_flight",
|
|
"",
|
|
labels=["block_name"],
|
|
sub_metrics=["real_time_max", "real_time_sum"],
|
|
)
|
|
|
|
|
|
P = ParamSpec("P")
|
|
R = TypeVar("R")
|
|
|
|
|
|
class HasClock(Protocol):
|
|
clock: Clock
|
|
|
|
|
|
def measure_func(
|
|
name: Optional[str] = None,
|
|
) -> Callable[[Callable[P, Awaitable[R]]], Callable[P, Awaitable[R]]]:
|
|
"""Decorate an async method with a `Measure` context manager.
|
|
|
|
The Measure is created using `self.clock`; it should only be used to decorate
|
|
methods in classes defining an instance-level `clock` attribute.
|
|
|
|
Usage:
|
|
|
|
@measure_func()
|
|
async def foo(...):
|
|
...
|
|
|
|
Which is analogous to:
|
|
|
|
async def foo(...):
|
|
with Measure(...):
|
|
...
|
|
|
|
"""
|
|
|
|
def wrapper(
|
|
func: Callable[Concatenate[HasClock, P], Awaitable[R]]
|
|
) -> Callable[P, Awaitable[R]]:
|
|
block_name = func.__name__ if name is None else name
|
|
|
|
@wraps(func)
|
|
async def measured_func(self: HasClock, *args: P.args, **kwargs: P.kwargs) -> R:
|
|
with Measure(self.clock, block_name):
|
|
r = await func(self, *args, **kwargs)
|
|
return r
|
|
|
|
# There are some shenanigans here, because we're decorating a method but
|
|
# explicitly making use of the `self` parameter. The key thing here is that the
|
|
# return type within the return type for `measure_func` itself describes how the
|
|
# decorated function will be called.
|
|
return measured_func # type: ignore[return-value]
|
|
|
|
return wrapper # type: ignore[return-value]
|
|
|
|
|
|
class Measure:
|
|
__slots__ = [
|
|
"clock",
|
|
"name",
|
|
"_logging_context",
|
|
"start",
|
|
]
|
|
|
|
def __init__(self, clock: Clock, name: str) -> None:
|
|
"""
|
|
Args:
|
|
clock: An object with a "time()" method, which returns the current
|
|
time in seconds.
|
|
name: The name of the metric to report.
|
|
"""
|
|
self.clock = clock
|
|
self.name = name
|
|
curr_context = current_context()
|
|
if not curr_context:
|
|
logger.warning(
|
|
"Starting metrics collection %r from sentinel context: metrics will be lost",
|
|
name,
|
|
)
|
|
parent_context = None
|
|
else:
|
|
assert isinstance(curr_context, LoggingContext)
|
|
parent_context = curr_context
|
|
self._logging_context = LoggingContext(str(curr_context), parent_context)
|
|
self.start: Optional[float] = None
|
|
|
|
def __enter__(self) -> "Measure":
|
|
if self.start is not None:
|
|
raise RuntimeError("Measure() objects cannot be re-used")
|
|
|
|
self.start = self.clock.time()
|
|
self._logging_context.__enter__()
|
|
in_flight.register((self.name,), self._update_in_flight)
|
|
|
|
logger.debug("Entering block %s", self.name)
|
|
|
|
return self
|
|
|
|
def __exit__(
|
|
self,
|
|
exc_type: Optional[Type[BaseException]],
|
|
exc_val: Optional[BaseException],
|
|
exc_tb: Optional[TracebackType],
|
|
) -> None:
|
|
if self.start is None:
|
|
raise RuntimeError("Measure() block exited without being entered")
|
|
|
|
logger.debug("Exiting block %s", self.name)
|
|
|
|
duration = self.clock.time() - self.start
|
|
usage = self.get_resource_usage()
|
|
|
|
in_flight.unregister((self.name,), self._update_in_flight)
|
|
self._logging_context.__exit__(exc_type, exc_val, exc_tb)
|
|
|
|
try:
|
|
block_counter.labels(self.name).inc()
|
|
block_timer.labels(self.name).inc(duration)
|
|
block_ru_utime.labels(self.name).inc(usage.ru_utime)
|
|
block_ru_stime.labels(self.name).inc(usage.ru_stime)
|
|
block_db_txn_count.labels(self.name).inc(usage.db_txn_count)
|
|
block_db_txn_duration.labels(self.name).inc(usage.db_txn_duration_sec)
|
|
block_db_sched_duration.labels(self.name).inc(usage.db_sched_duration_sec)
|
|
except ValueError:
|
|
logger.warning("Failed to save metrics! Usage: %s", usage)
|
|
|
|
def get_resource_usage(self) -> ContextResourceUsage:
|
|
"""Get the resources used within this Measure block
|
|
|
|
If the Measure block is still active, returns the resource usage so far.
|
|
"""
|
|
return self._logging_context.get_resource_usage()
|
|
|
|
def _update_in_flight(self, metrics: _InFlightMetric) -> None:
|
|
"""Gets called when processing in flight metrics"""
|
|
assert self.start is not None
|
|
duration = self.clock.time() - self.start
|
|
|
|
metrics.real_time_max = max(metrics.real_time_max, duration)
|
|
metrics.real_time_sum += duration
|
|
|
|
# TODO: Add other in flight metrics.
|
|
|
|
|
|
class DynamicCollectorRegistry(CollectorRegistry):
|
|
"""
|
|
Custom Prometheus Collector registry that calls a hook first, allowing you
|
|
to update metrics on-demand.
|
|
|
|
Don't forget to register this registry with the main registry!
|
|
"""
|
|
|
|
def __init__(self) -> None:
|
|
super().__init__()
|
|
self._pre_update_hooks: Dict[str, Callable[[], None]] = {}
|
|
|
|
def collect(self) -> Generator[Metric, None, None]:
|
|
"""
|
|
Collects metrics, calling pre-update hooks first.
|
|
"""
|
|
|
|
for pre_update_hook in self._pre_update_hooks.values():
|
|
pre_update_hook()
|
|
|
|
yield from super().collect()
|
|
|
|
def register_hook(self, metric_name: str, hook: Callable[[], None]) -> None:
|
|
"""
|
|
Registers a hook that is called before metric collection.
|
|
"""
|
|
|
|
self._pre_update_hooks[metric_name] = hook
|