Created
May 27, 2011 09:34
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Flask, session store in memcached
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| from flask import Flask, request, session, url_for, redirect, \ | |
| render_template, abort, g, flash | |
| from werkzeug.contrib.sessions import Session, SessionStore | |
| from cPickle import HIGHEST_PROTOCOL | |
| from random import random | |
| from flask import json | |
| class MemcachedSessionStore(SessionStore): | |
| def __init__(self, servers=None, key_prefix=None, default_timeout=300): | |
| SessionStore.__init__(self) | |
| if isinstance(servers, (list, tuple)): | |
| try: | |
| import cmemcache as memcache | |
| is_cmemcache = True | |
| except ImportError: | |
| try: | |
| import memcache | |
| is_cmemcache = False | |
| is_pylibmc = False | |
| except ImprotError: | |
| try: | |
| import pylibmc as memcache | |
| is_cmemcache = False | |
| is_pylibmc = True | |
| except ImportError: | |
| raise RuntimeErorr(' no memcache module found ') | |
| if is_cmemcache: | |
| client = memcache.Client(map(str, servers)) | |
| try: | |
| client.debuglog = lambda *a: None | |
| except Exception: | |
| pass | |
| else: | |
| if is_pylibmc: | |
| client = memcache.Client(servers, False) | |
| else: | |
| client = memcache.Client(servers, False, HIGHEST_PROTOCOL) | |
| else: | |
| client = servers | |
| self._memcache_client = client | |
| self._memcache_key_prefix = key_prefix | |
| self._memcache_timeout = default_timeout | |
| def save(self, session): | |
| key = self._get_memcache_key(session.sid) | |
| data = json.dumps(dict(session)) | |
| print "{0}:{1}".format(key, data) | |
| self._memcache_client.set( key, data ) | |
| def delete(self, session): | |
| key = self._get_memcache_key(session.sid) | |
| self._memcache_client.delete(key) | |
| def get(self, sid): | |
| key = self._get_memcache_key(sid) | |
| data = self._memcache_client.get( key ) | |
| if data is not None: | |
| data = json.loads(data) | |
| else: | |
| data = {} | |
| return self.session_class( data, sid, False) | |
| def _get_memcache_key(self, sid): | |
| key = self._memcache_key_prefix + sid | |
| if isinstance(key, unicode): | |
| key = key.encode('utf-8') | |
| return key | |
| class SessionMixin(object): | |
| __slots__ = ('session_key', 'session_store') | |
| def open_session(self, request): | |
| sid = request.cookies.get(self.session_key, None) | |
| if sid is None: | |
| return self.session_store.new() | |
| else: | |
| return self.session_store.get(sid) | |
| def save_session(self, session, response): | |
| if session.should_save: | |
| self.session_store.save(session) | |
| response.set_cookie(self.session_key, session.sid) | |
| return response | |
| class MyFlask( SessionMixin, Flask): pass | |
| app = MyFlask(__name__) | |
| app.session_key = '_sess_myflask' | |
| app.session_store = MemcachedSessionStore(['127.0.0.1:1122'], 'myflask:') | |
| @app.route('/a') | |
| def a(): | |
| session['a'] = 'from a {0}'.format(random()) | |
| return u'''<!doctype html> | |
| <html> | |
| <head> | |
| <title>Hello Test</title> | |
| </head> | |
| <body> | |
| <h1>saved {0}</h1> | |
| </body> | |
| </html>'''.format( session['a'] ) | |
| @app.route('/b') | |
| def b(): | |
| return u'''<!doctype html> | |
| <html> | |
| <head> | |
| <title>Hello Test</title> | |
| </head> | |
| <body> | |
| <h1>loaded {0}</h1> | |
| </body> | |
| </html>'''.format( session['a'] ) | |
| if __name__ == '__main__': | |
| app.run(debug=True) |
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You are importing
cmemcachedandmemcached, but the module you want iscmemcacheormemcache