Package tlslite :: Module basedb |
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# Source Code for Module tlslite.basedb

      1  # Authors:
      2  #   Trevor Perrin
      3  #   Martin von Loewis - python 3 port
      4  #
      5  # See the LICENSE file for legal information regarding use of this file.
      6
      7  """Base class for SharedKeyDB and VerifierDB."""
      8
      9  try:
     10      import anydbm
     11  except ImportError:
     12      # Python 3
     13      import dbm as anydbm
     14  import threading
     15
     16 -class BaseDB(object):
     17 -    def __init__(self, filename, type):
     18          self.type = type
     19          self.filename = filename
     20          if self.filename:
     21              self.db = None
     22          else:
     23              self.db = {}
     24          self.lock = threading.Lock()
     25
     26 -    def create(self):
     27          """Create a new on-disk database.
     28
     29          @raise anydbm.error: If there's a problem creating the database.
     30          """
     31          if self.filename:
     32              self.db = anydbm.open(self.filename, "n") #raises anydbm.error
     33              self.db["--Reserved--type"] = self.type
     34              self.db.sync()
     35          else:
     36              self.db = {}
     37
     38 -    def open(self):
     39          """Open a pre-existing on-disk database.
     40
     41          @raise anydbm.error: If there's a problem opening the database.
     42          @raise ValueError: If the database is not of the right type.
     43          """
     44          if not self.filename:
     45              raise ValueError("Can only open on-disk databases")
     46          self.db = anydbm.open(self.filename, "w") #raises anydbm.error
     47          try:
     48              if self.db["--Reserved--type"] != self.type:
     49                  raise ValueError("Not a %s database" % self.type)
     50          except KeyError:
     51              raise ValueError("Not a recognized database")
     52
     53 -    def __getitem__(self, username):
     54          if self.db == None:
     55              raise AssertionError("DB not open")
     56
     57          self.lock.acquire()
     58          try:
     59              valueStr = self.db[username]
     60          finally:
     61              self.lock.release()
     62
     63          return self._getItem(username, valueStr)
     64
     65 -    def __setitem__(self, username, value):
     66          if self.db == None:
     67              raise AssertionError("DB not open")
     68
     69          valueStr = self._setItem(username, value)
     70
     71          self.lock.acquire()
     72          try:
     73              self.db[username] = valueStr
     74              if self.filename:
     75                  self.db.sync()
     76          finally:
     77              self.lock.release()
     78
     79 -    def __delitem__(self, username):
     80          if self.db == None:
     81              raise AssertionError("DB not open")
     82
     83          self.lock.acquire()
     84          try:
     85              del(self.db[username])
     86              if self.filename:
     87                  self.db.sync()
     88          finally:
     89              self.lock.release()
     90
     91 -    def __contains__(self, username):
     92          """Check if the database contains the specified username.
     93
     94          @type username: str
     95          @param username: The username to check for.
     96
     97          @rtype: bool
     98          @return: True if the database contains the username, False
     99          otherwise.
    100
    101          """
    102          if self.db == None:
    103              raise AssertionError("DB not open")
    104
    105          self.lock.acquire()
    106          try:
    107              return self.db.has_key(username)
    108          finally:
    109              self.lock.release()
    110
    111 -    def check(self, username, param):
    112          value = self.__getitem__(username)
    113          return self._checkItem(value, username, param)
    114
    115 -    def keys(self):
    116          """Return a list of usernames in the database.
    117
    118          @rtype: list
    119          @return: The usernames in the database.
    120          """
    121          if self.db == None:
    122              raise AssertionError("DB not open")
    123
    124          self.lock.acquire()
    125          try:
    126              usernames = self.db.keys()
    127          finally:
    128              self.lock.release()
    129          usernames = [u for u in usernames if not u.startswith("--Reserved--")]
    130          return usernames
    131