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Clean up some code in the retry logic (#6017)

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* remove some unused code
* make things which were constants into constants for efficiency and clarity
This commit is contained in:
Richard van der Hoff 2019-09-11 15:14:56 +01:00 committed by GitHub
parent 9c555f37e3
commit 7902bf1e1d
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3 changed files with 14 additions and 36 deletions
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1
changelog.d/6017.misc Normal file
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@ -0,0 +1 @@
Clean up some code in the retry logic.

20
synapse/storage/transactions.py
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@ -250,26 +250,6 @@ class TransactionStore(SQLBaseStore):
},
)
def get_destinations_needing_retry(self):
"""Get all destinations which are due a retry for sending a transaction.
Returns:
list: A list of dicts
"""
return self.runInteraction(
"get_destinations_needing_retry", self._get_destinations_needing_retry
)
def _get_destinations_needing_retry(self, txn):
query = (
"SELECT * FROM destinations"
" WHERE retry_last_ts > 0 and retry_next_ts < ?"
)
txn.execute(query, (self._clock.time_msec(),))
return self.cursor_to_dict(txn)
def _start_cleanup_transactions(self):
return run_as_background_process(
"cleanup_transactions", self._cleanup_transactions

29
synapse/util/retryutils.py
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@ -22,6 +22,15 @@ from synapse.api.errors import CodeMessageException
logger = logging.getLogger(__name__)
# the intial backoff, after the first transaction fails
MIN_RETRY_INTERVAL = 10 * 60 * 1000
# how much we multiply the backoff by after each subsequent fail
RETRY_MULTIPLIER = 5
# a cap on the backoff
MAX_RETRY_INTERVAL = 24 * 60 * 60 * 1000
class NotRetryingDestination(Exception):
def __init__(self, retry_last_ts, retry_interval, destination):
@ -112,9 +121,6 @@ class RetryDestinationLimiter(object):
clock,
store,
retry_interval,
min_retry_interval=10 * 60 * 1000,
max_retry_interval=24 * 60 * 60 * 1000,
multiplier_retry_interval=5,
backoff_on_404=False,
backoff_on_failure=True,
):
@ -130,12 +136,6 @@ class RetryDestinationLimiter(object):
retry_interval (int): The next retry interval taken from the
database in milliseconds, or zero if the last request was
successful.
min_retry_interval (int): The minimum retry interval to use after
a failed request, in milliseconds.
max_retry_interval (int): The maximum retry interval to use after
a failed request, in milliseconds.
multiplier_retry_interval (int): The multiplier to use to increase
the retry interval after a failed request.
backoff_on_404 (bool): Back off if we get a 404
backoff_on_failure (bool): set to False if we should not increase the
@ -146,9 +146,6 @@ class RetryDestinationLimiter(object):
self.destination = destination
self.retry_interval = retry_interval
self.min_retry_interval = min_retry_interval
self.max_retry_interval = max_retry_interval
self.multiplier_retry_interval = multiplier_retry_interval
self.backoff_on_404 = backoff_on_404
self.backoff_on_failure = backoff_on_failure
@ -196,13 +193,13 @@ class RetryDestinationLimiter(object):
else:
# We couldn't connect.
if self.retry_interval:
self.retry_interval *= self.multiplier_retry_interval
self.retry_interval *= RETRY_MULTIPLIER
self.retry_interval *= int(random.uniform(0.8, 1.4))
if self.retry_interval >= self.max_retry_interval:
self.retry_interval = self.max_retry_interval
if self.retry_interval >= MAX_RETRY_INTERVAL:
self.retry_interval = MAX_RETRY_INTERVAL
else:
self.retry_interval = self.min_retry_interval
self.retry_interval = MIN_RETRY_INTERVAL
logger.info(
"Connection to %s was unsuccessful (%s(%s)); backoff now %i",