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cache.py
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cache.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import time
import pickle
import sqlite3
CACHE_FILENAME = os.path.expanduser("~/.ads/cache.db")
def get_value(key):
if not os.path.exists(CACHE_FILENAME):
return None
with sqlite3.connect(CACHE_FILENAME) as conn:
c = conn.cursor()
c.execute("SELECT * FROM cache WHERE key=?", (key, ))
result = c.fetchone()
if result is None:
return None
key, value, expires = result
if time.time() > expires:
c.execute("DELETE FROM cache WHERE key=?", (key,))
return None
return pickle.loads(value)
def set_value(key, value, timeout=86400): # 24 hours
with sqlite3.connect(CACHE_FILENAME) as conn:
c = conn.cursor()
c.execute("CREATE TABLE IF NOT EXISTS cache "
"(key TEXT PRIMARY KEY, val BLOB, exp FLOAT)")
expires = time.time() + timeout
c.execute("INSERT OR REPLACE INTO cache (key, val, exp) "
"VALUES (?, ?, ?)",
(key, pickle.dumps(value), expires))
def clean():
with sqlite3.connect(CACHE_FILENAME) as conn:
c = conn.cursor()
c.execute("DELETE FROM cache WHERE exp<=?", (time.time(),))