epicyon/cache.py

89 lines
2.9 KiB
Python

__filename__ = "cache.py"
__author__ = "Bob Mottram"
__license__ = "AGPL3+"
__version__ = "1.1.0"
__maintainer__ = "Bob Mottram"
__email__ = "bob@freedombone.net"
__status__ = "Production"
import os
import datetime
from utils import loadJson
from utils import saveJson
from utils import getFileCaseInsensitive
def storePersonInCache(baseDir: str, personUrl: str,
personJson: {}, personCache: {}) -> None:
"""Store an actor in the cache
"""
currTime = datetime.datetime.utcnow()
personCache[personUrl] = {
"actor": personJson,
"timestamp": currTime.strftime("%Y-%m-%dT%H:%M:%SZ")
}
if not baseDir:
return
# store to file
if os.path.isdir(baseDir+'/cache/actors'):
cacheFilename = baseDir + '/cache/actors/' + \
personUrl.replace('/', '#')+'.json'
if not os.path.isfile(cacheFilename):
saveJson(personJson, cacheFilename)
def getPersonFromCache(baseDir: str, personUrl: str, personCache: {}) -> {}:
"""Get an actor from the cache
"""
# if the actor is not in memory then try to load it from file
loadedFromFile = False
if not personCache.get(personUrl):
cacheFilename = baseDir + '/cache/actors/' + \
personUrl.replace('/', '#')+'.json'
if os.path.isfile(getFileCaseInsensitive(cacheFilename)):
personJson = loadJson(getFileCaseInsensitive(cacheFilename))
if personJson:
storePersonInCache(baseDir, personUrl, personJson, personCache)
loadedFromFile = True
if personCache.get(personUrl):
if not loadedFromFile:
# update the timestamp for the last time the actor was retrieved
currTime = datetime.datetime.utcnow()
currTimeStr = currTime.strftime("%Y-%m-%dT%H:%M:%SZ")
personCache[personUrl]['timestamp'] = currTimeStr
return personCache[personUrl]['actor']
return None
def expirePersonCache(personCache: {}):
"""Expires old entries from the cache in memory
"""
currTime = datetime.datetime.utcnow()
removals = []
for personUrl, cacheJson in personCache.items():
cacheTime = datetime.datetime.strptime(cacheJson['timestamp'],
"%Y-%m-%dT%H:%M:%SZ")
daysSinceCached = (currTime - cacheTime).days
if daysSinceCached > 2:
removals.append(personUrl)
if len(removals) > 0:
for personUrl in removals:
del personCache[personUrl]
print(str(len(removals)) + ' actors were expired from the cache')
def storeWebfingerInCache(handle: str, wf, cachedWebfingers: {}) -> None:
"""Store a webfinger endpoint in the cache
"""
cachedWebfingers[handle] = wf
def getWebfingerFromCache(handle: str, cachedWebfingers: {}) -> {}:
"""Get webfinger endpoint from the cache
"""
if cachedWebfingers.get(handle):
return cachedWebfingers[handle]
return None