171 lines
5.2 KiB
Python
171 lines
5.2 KiB
Python
# -*- coding: utf-8 -*-
|
|
# 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 typing import Any, Callable, Optional, TypeVar, cast
|
|
|
|
from prometheus_client import Counter
|
|
|
|
from synapse.logging.context import (
|
|
ContextResourceUsage,
|
|
LoggingContext,
|
|
current_context,
|
|
)
|
|
from synapse.metrics import InFlightGauge
|
|
|
|
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"]
|
|
)
|
|
|
|
# Tracks the number of blocks currently active
|
|
in_flight = InFlightGauge(
|
|
"synapse_util_metrics_block_in_flight",
|
|
"",
|
|
labels=["block_name"],
|
|
sub_metrics=["real_time_max", "real_time_sum"],
|
|
)
|
|
|
|
T = TypeVar("T", bound=Callable[..., Any])
|
|
|
|
|
|
def measure_func(name: Optional[str] = None) -> Callable[[T], T]:
|
|
"""
|
|
Used to decorate an async function with a `Measure` context manager.
|
|
|
|
Usage:
|
|
|
|
@measure_func()
|
|
async def foo(...):
|
|
...
|
|
|
|
Which is analogous to:
|
|
|
|
async def foo(...):
|
|
with Measure(...):
|
|
...
|
|
|
|
"""
|
|
|
|
def wrapper(func: T) -> T:
|
|
block_name = func.__name__ if name is None else name
|
|
|
|
@wraps(func)
|
|
async def measured_func(self, *args, **kwargs):
|
|
with Measure(self.clock, block_name):
|
|
r = await func(self, *args, **kwargs)
|
|
return r
|
|
|
|
return cast(T, measured_func)
|
|
|
|
return wrapper
|
|
|
|
|
|
class Measure:
|
|
__slots__ = [
|
|
"clock",
|
|
"name",
|
|
"_logging_context",
|
|
"start",
|
|
]
|
|
|
|
def __init__(self, clock, name):
|
|
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(
|
|
"Measure[%s]" % (self.name,), parent_context
|
|
)
|
|
self.start = 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)
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
if self.start is None:
|
|
raise RuntimeError("Measure() block exited without being entered")
|
|
|
|
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):
|
|
"""Gets called when processing in flight metrics"""
|
|
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.
|