mirror of https://github.com/MISP/misp-modules
84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# MISP modules helper - cache
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#
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# Copyright (C) 2016 Alexandre Dulaunoy
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# Copyright (C) 2016 CIRCL - Computer Incident Response Center Luxembourg
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os
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import redis
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import hashlib
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port = int(os.getenv("REDIS_PORT")) if os.getenv("REDIS_PORT") else 6379
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hostname = os.getenv("REDIS_BACKEND") or '127.0.0.1'
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db = int(os.getenv("REDIS_DATABASE")) if os.getenv("REDIS_DATABASE") else 0
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def selftest(enable=True):
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if not enable:
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return False
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r = redis.Redis(host=hostname, port=port, db=db)
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try:
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r.ping()
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except Exception:
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return 'Redis not running or not installed. Helper will be disabled.'
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def get(modulename=None, query=None, value=None, debug=False):
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if (modulename is None or query is None):
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return False
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r = redis.Redis(host=hostname, port=port, db=db, decode_responses=True)
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h = hashlib.sha1()
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h.update(query.encode('UTF-8'))
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hv = h.hexdigest()
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key = "m:{}:{}".format(modulename, hv)
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if not r.exists(key):
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if debug:
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print("Key {} added in cache".format(key))
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r.setex(key, 86400, value)
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else:
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if debug:
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print("Cache hit with Key {}".format(key))
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return r.get(key)
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def flush():
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r = redis.StrictRedis(host=hostname, port=port, db=db, decode_responses=True)
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returncode = r.flushdb()
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return returncode
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if __name__ == "__main__":
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import sys
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if selftest() is not None:
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sys.exit()
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else:
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print("Selftest ok")
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v = get(modulename="testmodule", query="abcdef", value="barfoo", debug=True)
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if v == 'barfoo':
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print("Cache ok")
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v = get(modulename="testmodule", query="abcdef")
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print(v)
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v = get(modulename="testmodule")
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if (not v):
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print("Failed ok")
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if flush():
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print("Cache flushed ok")
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