Get full text RSS feeds https://morss.it/
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 

188 lines
5.6 KiB

# This file is part of morss
#
# Copyright (C) 2013-2020 pictuga <contact@pictuga.com>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
import os
import pickle
import threading
import time
from collections import OrderedDict
CACHE_SIZE = int(os.getenv('CACHE_SIZE', 1000)) # max number of items in cache (default: 1k items)
CACHE_LIFESPAN = int(os.getenv('CACHE_LIFESPAN', 60)) # how often to auto-clear the cache (default: 1min)
class BaseCache:
""" Subclasses must behave like a dict """
def trim(self):
pass
def autotrim(self, delay=CACHE_LIFESPAN):
# trim the cache every so often
self.trim()
t = threading.Timer(delay, self.autotrim)
t.daemon = True
t.start()
def __contains__(self, url):
try:
self[url]
except KeyError:
return False
else:
return True
try:
import sqlite3 # isort:skip
except ImportError:
pass
class SQLiteCache(BaseCache):
def __init__(self, filename=':memory:'):
self.con = sqlite3.connect(filename, detect_types=sqlite3.PARSE_DECLTYPES, check_same_thread=False)
with self.con:
self.con.execute('CREATE TABLE IF NOT EXISTS data (ky UNICODE PRIMARY KEY, data BLOB, timestamp INT)')
self.con.execute('pragma journal_mode=WAL')
self.trim()
def __del__(self):
self.con.close()
def trim(self):
with self.con:
self.con.execute('DELETE FROM data WHERE timestamp <= ( SELECT timestamp FROM ( SELECT timestamp FROM data ORDER BY timestamp DESC LIMIT 1 OFFSET ? ) foo )', (CACHE_SIZE,))
def __getitem__(self, key):
row = self.con.execute('SELECT * FROM data WHERE ky=?', (key,)).fetchone()
if not row:
raise KeyError
return row[1]
def __setitem__(self, key, data):
with self.con:
self.con.execute('INSERT INTO data VALUES (?,?,?) ON CONFLICT(ky) DO UPDATE SET data=?, timestamp=?', (key, data, time.time(), data, time.time()))
try:
import pymysql.cursors # isort:skip
except ImportError:
pass
class MySQLCacheHandler(BaseCache):
def __init__(self, user, password, database, host='localhost'):
self.user = user
self.password = password
self.database = database
self.host = host
with self.cursor() as cursor:
cursor.execute('CREATE TABLE IF NOT EXISTS data (ky VARCHAR(255) NOT NULL PRIMARY KEY, data MEDIUMBLOB, timestamp INT)')
self.trim()
def cursor(self):
return pymysql.connect(host=self.host, user=self.user, password=self.password, database=self.database, charset='utf8', autocommit=True).cursor()
def trim(self):
with self.cursor() as cursor:
cursor.execute('DELETE FROM data WHERE timestamp <= ( SELECT timestamp FROM ( SELECT timestamp FROM data ORDER BY timestamp DESC LIMIT 1 OFFSET %s ) foo )', (CACHE_SIZE,))
def __getitem__(self, key):
cursor = self.cursor()
cursor.execute('SELECT * FROM data WHERE ky=%s', (key,))
row = cursor.fetchone()
if not row:
raise KeyError
return row[1]
def __setitem__(self, key, data):
with self.cursor() as cursor:
cursor.execute('INSERT INTO data VALUES (%s,%s,%s) ON DUPLICATE KEY UPDATE data=%s, timestamp=%s',
(key, data, time.time(), data, time.time()))
class CappedDict(OrderedDict, BaseCache):
def trim(self):
if CACHE_SIZE >= 0:
for i in range( max( len(self) - CACHE_SIZE , 0 )):
self.popitem(False)
def __setitem__(self, key, data):
# https://docs.python.org/2/library/collections.html#ordereddict-examples-and-recipes
if key in self:
del self[key]
OrderedDict.__setitem__(self, key, data)
try:
import redis # isort:skip
except ImportError:
pass
class RedisCacheHandler(BaseCache):
def __init__(self, host='localhost', port=6379, db=0, password=None):
self.r = redis.Redis(host=host, port=port, db=db, password=password)
def __getitem__(self, key):
return self.r.get(key)
def __setitem__(self, key, data):
self.r.set(key, data)
if 'CACHE' in os.environ:
if os.environ['CACHE'] == 'mysql':
default_cache = MySQLCacheHandler(
user = os.getenv('MYSQL_USER'),
password = os.getenv('MYSQL_PWD'),
database = os.getenv('MYSQL_DB'),
host = os.getenv('MYSQL_HOST', 'localhost')
)
elif os.environ['CACHE'] == 'sqlite':
if 'SQLITE_PATH' in os.environ:
path = os.getenv('SQLITE_PATH')
else:
path = ':memory:'
default_cache = SQLiteCache(path)
elif os.environ['CACHE'] == 'redis':
default_cache = RedisCacheHandler(
host = os.getenv('REDIS_HOST', 'localhost'),
port = int(os.getenv('REDIS_PORT', 6379)),
db = int(os.getenv('REDIS_DB', 0)),
password = os.getenv('REDIS_PWD', None)
)
else:
default_cache = CappedDict()