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import os
import time
from threading import Thread, Lock
import sentry_sdk
from sentry_sdk.utils import logger
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from typing import Optional
MAX_DOWNSAMPLE_FACTOR = 10
class Monitor:
"""
Performs health checks in a separate thread once every interval seconds
and updates the internal state. Other parts of the SDK only read this state
and act accordingly.
"""
name = "sentry.monitor"
def __init__(self, transport, interval=10):
# type: (sentry_sdk.transport.Transport, float) -> None
self.transport = transport # type: sentry_sdk.transport.Transport
self.interval = interval # type: float
self._healthy = True
self._downsample_factor = 0 # type: int
self._thread = None # type: Optional[Thread]
self._thread_lock = Lock()
self._thread_for_pid = None # type: Optional[int]
self._running = True
def _ensure_running(self):
# type: () -> None
"""
Check that the monitor has an active thread to run in, or create one if not.
Note that this might fail (e.g. in Python 3.12 it's not possible to
spawn new threads at interpreter shutdown). In that case self._running
will be False after running this function.
"""
if self._thread_for_pid == os.getpid() and self._thread is not None:
return None
with self._thread_lock:
if self._thread_for_pid == os.getpid() and self._thread is not None:
return None
def _thread():
# type: (...) -> None
while self._running:
time.sleep(self.interval)
if self._running:
self.run()
thread = Thread(name=self.name, target=_thread)
thread.daemon = True
try:
thread.start()
except RuntimeError:
# Unfortunately at this point the interpreter is in a state that no
# longer allows us to spawn a thread and we have to bail.
self._running = False
return None
self._thread = thread
self._thread_for_pid = os.getpid()
return None
def run(self):
# type: () -> None
self.check_health()
self.set_downsample_factor()
def set_downsample_factor(self):
# type: () -> None
if self._healthy:
if self._downsample_factor > 0:
logger.debug(
"[Monitor] health check positive, reverting to normal sampling"
)
self._downsample_factor = 0
else:
if self.downsample_factor < MAX_DOWNSAMPLE_FACTOR:
self._downsample_factor += 1
logger.debug(
"[Monitor] health check negative, downsampling with a factor of %d",
self._downsample_factor,
)
def check_health(self):
# type: () -> None
"""
Perform the actual health checks,
currently only checks if the transport is rate-limited.
TODO: augment in the future with more checks.
"""
self._healthy = self.transport.is_healthy()
def is_healthy(self):
# type: () -> bool
self._ensure_running()
return self._healthy
@property
def downsample_factor(self):
# type: () -> int
self._ensure_running()
return self._downsample_factor
def kill(self):
# type: () -> None
self._running = False
def __del__(self):
# type: () -> None
self.kill()