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queue: Suppress error mail from brief rabbitmq downtimes.

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Details in comment.  Together with a few previous commits, this should
completely eliminate sending error mail to admins when the RabbitMQ
server is simply restarted and comes back up normally.
This commit is contained in:
Greg Price
2018-03-20 16:37:04 -07:00
committed by Greg Price
parent d857f26cd3
commit 73559e5320
1 changed files with 22 additions and 2 deletions
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24
zerver/lib/queue.py
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@@ -183,6 +183,7 @@ class TornadoQueueClient(SimpleQueueClient):
# TornadoConnection can process heartbeats, so enable them.
rabbitmq_heartbeat=None)
self._on_open_cbs = [] # type: List[Callable[[], None]]
self._connection_failure_count = 0
def _connect(self) -> None:
self.log.info("Beginning TornadoQueueClient connection")
@@ -202,21 +203,40 @@ class TornadoQueueClient(SimpleQueueClient):
CONNECTION_RETRY_SECS = 2
# When the RabbitMQ server is restarted, it's normal for it to
# take a few seconds to come back; we'll retry a few times and all
# will be well. So for the first few failures, we report only at
# "warning" level, avoiding an email to the server admin.
#
# A loss of an existing connection starts a retry loop just like a
# failed connection attempt, so it counts as the first failure.
#
# On an unloaded test system, a RabbitMQ restart takes about 6s,
# potentially causing 4 failures. We add some headroom above that.
CONNECTION_FAILURES_BEFORE_NOTIFY = 10
def _on_connection_open_error(self, connection: pika.connection.Connection,
message: Optional[str]=None) -> None:
self._connection_failure_count += 1
retry_secs = self.CONNECTION_RETRY_SECS
self.log.critical("TornadoQueueClient couldn't connect to RabbitMQ, retrying in %d secs..."
% (retry_secs,))
message = ("TornadoQueueClient couldn't connect to RabbitMQ, retrying in %d secs..."
% (retry_secs,))
if self._connection_failure_count > self.CONNECTION_FAILURES_BEFORE_NOTIFY:
self.log.critical(message)
else:
self.log.warning(message)
ioloop.IOLoop.instance().call_later(retry_secs, self._reconnect)
def _on_connection_closed(self, connection: pika.connection.Connection,
reply_code: int, reply_text: str) -> None:
self._connection_failure_count = 1
retry_secs = self.CONNECTION_RETRY_SECS
self.log.warning("TornadoQueueClient lost connection to RabbitMQ, reconnecting in %d secs..."
% (retry_secs,))
ioloop.IOLoop.instance().call_later(retry_secs, self._reconnect)
def _on_open(self, connection: pika.connection.Connection) -> None:
self._connection_failure_count = 0
try:
self.connection.channel(
on_open_callback = self._on_channel_open)