| 1 | import threading, time, pickle, random, os |
| 2 | import cookie |
| 3 | |
| 4 | __all__ = ["db", "get"] |
| 5 | |
| 6 | def hexencode(str): |
| 7 | ret = "" |
| 8 | for byte in str: |
| 9 | ret += "%02X" % (ord(byte),) |
| 10 | return ret |
| 11 | |
| 12 | def gennonce(length): |
| 13 | nonce = "" |
| 14 | for i in xrange(length): |
| 15 | nonce += chr(random.randint(0, 255)) |
| 16 | return nonce |
| 17 | |
| 18 | class session(object): |
| 19 | def __init__(self, expire = 86400 * 7): |
| 20 | self.id = hexencode(gennonce(16)) |
| 21 | self.dict = {} |
| 22 | self.lock = threading.Lock() |
| 23 | self.ctime = self.atime = self.mtime = int(time.time()) |
| 24 | self.expire = expire |
| 25 | self.dctl = set() |
| 26 | self.dirtyp = False |
| 27 | |
| 28 | def dirty(self): |
| 29 | for d in self.dctl: |
| 30 | if d.sessdirty(): |
| 31 | return True |
| 32 | return self.dirtyp |
| 33 | |
| 34 | def frozen(self): |
| 35 | for d in self.dctl: |
| 36 | d.sessfrozen() |
| 37 | self.dirtyp = False |
| 38 | |
| 39 | def __getitem__(self, key): |
| 40 | return self.dict[key] |
| 41 | |
| 42 | def get(self, key, default = None): |
| 43 | return self.dict.get(key, default) |
| 44 | |
| 45 | def __setitem__(self, key, value): |
| 46 | self.dict[key] = value |
| 47 | if hasattr(value, "sessdirty"): |
| 48 | self.dctl.add(value) |
| 49 | else: |
| 50 | self.dirtyp = True |
| 51 | |
| 52 | def __delitem__(self, key): |
| 53 | old = self.dict.pop(key) |
| 54 | if old in self.dctl: |
| 55 | self.dctl.remove(old) |
| 56 | self.dirtyp = True |
| 57 | |
| 58 | def __contains__(self, key): |
| 59 | return key in self.dict |
| 60 | |
| 61 | def __getstate__(self): |
| 62 | ret = [] |
| 63 | for k, v in self.__dict__.items(): |
| 64 | if k == "lock": continue |
| 65 | ret.append((k, v)) |
| 66 | return ret |
| 67 | |
| 68 | def __setstate__(self, st): |
| 69 | for k, v in st: |
| 70 | self.__dict__[k] = v |
| 71 | self.lock = threading.Lock() |
| 72 | |
| 73 | class db(object): |
| 74 | def __init__(self, cookiename = "wrwsess", path = "/"): |
| 75 | self.live = {} |
| 76 | self.cookiename = cookiename |
| 77 | self.path = path |
| 78 | self.lock = threading.Lock() |
| 79 | self.lastuse = 0 |
| 80 | self.cthread = None |
| 81 | self.freezetime = 3600 |
| 82 | |
| 83 | def clean(self): |
| 84 | now = int(time.time()) |
| 85 | with self.lock: |
| 86 | dlist = [] |
| 87 | for sess in self.live.itervalues(): |
| 88 | if sess.atime + self.freezetime < now: |
| 89 | try: |
| 90 | if sess.dirty(): |
| 91 | self.freeze(sess) |
| 92 | except: |
| 93 | if sess.atime + sess.expire < now: |
| 94 | dlist.append(sess) |
| 95 | else: |
| 96 | dlist.append(sess) |
| 97 | for sess in dlist: |
| 98 | del self.live[sess.id] |
| 99 | |
| 100 | def cleanloop(self): |
| 101 | try: |
| 102 | lastuse = self.lastuse |
| 103 | while self.lastuse >= lastuse: |
| 104 | lastuse = self.lastuse |
| 105 | time.sleep(300) |
| 106 | self.clean() |
| 107 | finally: |
| 108 | with self.lock: |
| 109 | self.cthread = None |
| 110 | |
| 111 | def fetch(self, req): |
| 112 | now = int(time.time()) |
| 113 | self.lastuse = now |
| 114 | sessid = cookie.get(req, self.cookiename) |
| 115 | with self.lock: |
| 116 | if self.cthread is None: |
| 117 | self.cthread = threading.Thread(target = self.cleanloop) |
| 118 | self.cthread.setDaemon(True) |
| 119 | self.cthread.start() |
| 120 | try: |
| 121 | if sessid is None: |
| 122 | raise KeyError() |
| 123 | elif sessid in self.live: |
| 124 | sess = self.live[sessid] |
| 125 | else: |
| 126 | sess = self.thaw(sessid) |
| 127 | self.live[sessid] = sess |
| 128 | if sess.atime + sess.expire < now: |
| 129 | raise KeyError() |
| 130 | sess.atime = now |
| 131 | except KeyError: |
| 132 | sess = session() |
| 133 | self.live[sess.id] = sess |
| 134 | req.oncommit(self.addcookie) |
| 135 | req.oncommit(self.ckfreeze) |
| 136 | return sess |
| 137 | |
| 138 | def addcookie(self, req): |
| 139 | sess = req.item(self.fetch) |
| 140 | cookie.add(req, self.cookiename, sess.id, self.path) |
| 141 | |
| 142 | def ckfreeze(self, req): |
| 143 | sess = req.item(self.fetch) |
| 144 | if sess.dirty(): |
| 145 | try: |
| 146 | self.freeze(sess) |
| 147 | except: |
| 148 | pass |
| 149 | |
| 150 | def thaw(self, sessid): |
| 151 | raise KeyError() |
| 152 | |
| 153 | def freeze(self, sess): |
| 154 | raise TypeError() |
| 155 | |
| 156 | class backeddb(db): |
| 157 | def __init__(self, backdb, *args, **kw): |
| 158 | super(backeddb, self).__init__(*args, **kw) |
| 159 | self.backdb = backdb |
| 160 | |
| 161 | def thaw(self, sessid): |
| 162 | data = self.backdb[sessid] |
| 163 | try: |
| 164 | return pickle.loads(data) |
| 165 | except Exception, e: |
| 166 | raise KeyError() |
| 167 | |
| 168 | def freeze(self, sess): |
| 169 | self.backdb[sess.id] = pickle.dumps(sess) |
| 170 | sess.frozen() |
| 171 | |
| 172 | class dirback(object): |
| 173 | def __init__(self, path): |
| 174 | self.path = path |
| 175 | |
| 176 | def __getitem__(self, key): |
| 177 | try: |
| 178 | with open(os.path.join(self.path, key)) as inf: |
| 179 | return inf.read() |
| 180 | except IOError: |
| 181 | raise KeyError(key) |
| 182 | |
| 183 | def __setitem__(self, key, value): |
| 184 | if not os.path.exists(self.path): |
| 185 | os.makedirs(self.path) |
| 186 | with open(os.path.join(self.path, key), "w") as out: |
| 187 | out.write(value) |
| 188 | |
| 189 | default = backeddb(dirback(os.path.join("/tmp", "wrwsess-" + str(os.getuid())))) |
| 190 | |
| 191 | def get(req): |
| 192 | return req.item(default.fetch) |