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add a write-through cache on the retry schedule

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This commit is contained in:
Matthew Hodgson 2014-12-08 17:48:57 +00:00
parent 9c43b258ec
commit 0d3fa1ac6e
1 changed files with 15 additions and 4 deletions
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19
synapse/storage/transactions.py
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@ -26,6 +26,9 @@ class TransactionStore(SQLBaseStore):
"""A collection of queries for handling PDUs.
"""
# a write-through cache of DestinationsTable.EntryType indexed by destination string
destination_retry_cache = {}
def get_received_txn_response(self, transaction_id, origin):
"""For an incoming transaction from a given origin, check if we have
already responded to it. If so, return the response code and response
@ -213,10 +216,11 @@ class TransactionStore(SQLBaseStore):
Returns:
None if not retrying
tuple: (retry_last_ts, retry_interval)
retry_ts: time of last retry attempt in unix epoch ms
retry_interval: how long until next retry in ms
Otherwise a DestinationsTable.EntryType for the retry scheme
"""
if self.destination_retry_cache[destination]:
return self.destination_retry_cache[destination]
return self.runInteraction(
"get_destination_retry_timings",
self._get_destination_retry_timings, destination)
@ -225,7 +229,7 @@ class TransactionStore(SQLBaseStore):
query = DestinationsTable.select_statement("destination = ?")
txn.execute(query, (destination,))
result = DestinationsTable.decode_single_result(txn.fetchone())
if result and result[0] > 0:
if result and result.retry_last_ts > 0:
return result
else:
return None
@ -239,6 +243,12 @@ class TransactionStore(SQLBaseStore):
retry_last_ts (int) - time of last retry attempt in unix epoch ms
retry_interval (int) - how long until next retry in ms
"""
self.destination_retry_cache[destination] = (
DestinationsTable.EntryType(destination, retry_last_ts, retry_interval)
)
# xxx: we could chose to not bother persisting this if our cache things this is a NOOP
return self.runInteraction(
"set_destination_retry_timings",
self._set_destination_retry_timings, destination, retry_last_ts, retry_interval)
@ -260,6 +270,7 @@ class TransactionStore(SQLBaseStore):
Returns:
list: A list of `DestinationsTable.EntryType`
"""
return self.runInteraction(
"get_destinations_needing_retry",
self._get_destinations_needing_retry