epicyon/cache.py

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