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Mutex TTL Cache accesses which can be accessed by multiple threads

Browse Source 
Apparently, cachetools is (intentionally) not threadsafe
when using the Caches directly.
It's therefore recommended to wrap these with an explicit lock to avoid
problems.

source: https://github.com/tkem/cachetools/issues/245

closes #7215
This commit is contained in:
Matthias 2022-08-16 19:43:41 +02:00
parent ea6bc47d7a
commit 0b0e7eaf96
2 changed files with 17 additions and 8 deletions
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24
freqtrade/exchange/exchange.py
View File

@ -116,6 +116,7 @@ class Exchange:
self._last_markets_refresh: int = 0 self._last_markets_refresh: int = 0
# Cache for 10 minutes ... # Cache for 10 minutes ...
self._cache_lock = Lock()
self._fetch_tickers_cache: TTLCache = TTLCache(maxsize=2, ttl=60 * 10) self._fetch_tickers_cache: TTLCache = TTLCache(maxsize=2, ttl=60 * 10)
# Cache values for 1800 to avoid frequent polling of the exchange for prices # Cache values for 1800 to avoid frequent polling of the exchange for prices
# Caching only applies to RPC methods, so prices for open trades are still # Caching only applies to RPC methods, so prices for open trades are still
@ -1388,12 +1389,14 @@ class Exchange:
if not self.exchange_has('fetchBidsAsks'): if not self.exchange_has('fetchBidsAsks'):
return {} return {}
if cached: if cached:
tickers = self._fetch_tickers_cache.get('fetch_bids_asks') with self._cache_lock:
tickers = self._fetch_tickers_cache.get('fetch_bids_asks')
if tickers: if tickers:
return tickers return tickers
try: try:
tickers = self._api.fetch_bids_asks(symbols) tickers = self._api.fetch_bids_asks(symbols)
self._fetch_tickers_cache['fetch_bids_asks'] = tickers with self._cache_lock:
self._fetch_tickers_cache['fetch_bids_asks'] = tickers
return tickers return tickers
except ccxt.NotSupported as e: except ccxt.NotSupported as e:
raise OperationalException( raise OperationalException(
@ -1414,12 +1417,14 @@ class Exchange:
:return: fetch_tickers result :return: fetch_tickers result
""" """
if cached: if cached:
tickers = self._fetch_tickers_cache.get('fetch_tickers') with self._cache_lock:
tickers = self._fetch_tickers_cache.get('fetch_tickers')
if tickers: if tickers:
return tickers return tickers
try: try:
tickers = self._api.fetch_tickers(symbols) tickers = self._api.fetch_tickers(symbols)
self._fetch_tickers_cache['fetch_tickers'] = tickers with self._cache_lock:
self._fetch_tickers_cache['fetch_tickers'] = tickers
return tickers return tickers
except ccxt.NotSupported as e: except ccxt.NotSupported as e:
raise OperationalException( raise OperationalException(
@ -1528,7 +1533,8 @@ class Exchange:
cache_rate: TTLCache = self._entry_rate_cache if side == "entry" else self._exit_rate_cache cache_rate: TTLCache = self._entry_rate_cache if side == "entry" else self._exit_rate_cache
if not refresh: if not refresh:
rate = cache_rate.get(pair) with self._cache_lock:
rate = cache_rate.get(pair)
# Check if cache has been invalidated # Check if cache has been invalidated
if rate: if rate:
logger.debug(f"Using cached {side} rate for {pair}.") logger.debug(f"Using cached {side} rate for {pair}.")
@ -1573,7 +1579,8 @@ class Exchange:
if rate is None: if rate is None:
raise PricingError(f"{name}-Rate for {pair} was empty.") raise PricingError(f"{name}-Rate for {pair} was empty.")
cache_rate[pair] = rate with self._cache_lock:
cache_rate[pair] = rate
return rate return rate
@ -1581,8 +1588,9 @@ class Exchange:
entry_rate = None entry_rate = None
exit_rate = None exit_rate = None
if not refresh: if not refresh:
entry_rate = self._entry_rate_cache.get(pair) with self._cache_lock:
exit_rate = self._exit_rate_cache.get(pair) entry_rate = self._entry_rate_cache.get(pair)
exit_rate = self._exit_rate_cache.get(pair)
if entry_rate: if entry_rate:
logger.debug(f"Using cached buy rate for {pair}.") logger.debug(f"Using cached buy rate for {pair}.")
if exit_rate: if exit_rate:

1
freqtrade/optimize/hyperopt.py
View File

@ -483,6 +483,7 @@ class Hyperopt:
self.backtesting.exchange._api_async = None self.backtesting.exchange._api_async = None
self.backtesting.exchange.loop = None # type: ignore self.backtesting.exchange.loop = None # type: ignore
self.backtesting.exchange._loop_lock = None # type: ignore self.backtesting.exchange._loop_lock = None # type: ignore
self.backtesting.exchange._cache_lock = None # type: ignore
# self.backtesting.exchange = None # type: ignore # self.backtesting.exchange = None # type: ignore
self.backtesting.pairlists = None # type: ignore self.backtesting.pairlists = None # type: ignore