This commit is contained in:
Erik Johnston 2015-02-18 10:09:54 +00:00
parent 9371019133
commit d77912ff44

View file

@ -35,6 +35,23 @@ class NotRetryingDestination(Exception):
@defer.inlineCallbacks
def get_retry_limiter(destination, clock, store, **kwargs):
"""For a given destination check if we have previously failed to
send a request there and are waiting before retrying the destination.
If we are not ready to retry the destination, this will raise a
NotRetryingDestination exception. Otherwise, will return a Context Manager
that will mark the destination as down if an exception is thrown (excluding
CodeMessageException with code < 500)
Example usage:
try:
limiter = yield get_retry_limiter(destination, clock, store)
with limiter:
response = yield do_request()
except NotRetryingDestination:
# We aren't ready to retry that destination.
raise
"""
retry_last_ts, retry_interval = (0, 0)
retry_timings = yield store.get_destination_retry_timings(
@ -68,8 +85,23 @@ def get_retry_limiter(destination, clock, store, **kwargs):
class RetryDestinationLimiter(object):
def __init__(self, destination, clock, store, retry_interval,
min_retry_interval=20000, max_retry_interval=60 * 60 * 1000,
min_retry_interval=5000, max_retry_interval=60 * 60 * 1000,
multiplier_retry_interval=2,):
"""
Args:
destination (str)
clock (Clock)
store (DataStore)
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.
"""
self.clock = clock
self.store = store
self.destination = destination