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# License?
"""A U1DB implementation for using Object Stores as its persistence layer."""
import gnupg
class GPGWrapper():
"""
This is a temporary class for handling GPG requests, and should be
replaced by a more general class used throughout the project.
"""
GNUPG_HOME = "~/.config/leap/gnupg"
GNUPG_BINARY = "/usr/bin/gpg" # this has to be changed based on OS
def __init__(self, gpghome=GNUPG_HOME, gpgbinary=GNUPG_BINARY):
self.gpg = gnupg.GPG(gnupghome=gpghome, gpgbinary=gpgbinary)
def find_key(self, email):
"""
Find user's key based on their email.
"""
for key in self.gpg.list_keys():
for uid in key['uids']:
if re.search(email, uid):
return key
raise LookupError("GnuPG public key for %s not found!" % email)
def encrypt(self, data, recipient, sign=None, always_trust=False,
passphrase=None, symmetric=False):
return self.gpg.encrypt(data, recipient, sign=sign,
always_trust=always_trust,
passphrase=passphrase, symmetric=symmetric)
def decrypt(self, data, always_trust=False, passphrase=None):
return self.gpg.decrypt(data, always_trust=always_trust,
passphrase=passphrase)
def import_keys(self, data):
return self.gpg.import_keys(data)
#----------------------------------------------------------------------------
# u1db Transaction and Sync logs.
#----------------------------------------------------------------------------
class SimpleLog(object):
def __init__(self):
self._log = []
def _set_log(self, log):
self._log = log
def _get_log(self):
return self._log
log = property(
_get_log, _set_log, doc="Log contents.")
def append(self, msg):
self._log.append(msg)
def reduce(self, func, initializer=None):
return reduce(func, self.log, initializer)
def map(self, func):
return map(func, self.log)
def filter(self, func):
return filter(func, self.log)
class TransactionLog(SimpleLog):
"""
An ordered list of (generation, doc_id, transaction_id) tuples.
"""
def _set_log(self, log):
self._log = log
def _get_log(self):
return sorted(self._log, reverse=True)
log = property(
_get_log, _set_log, doc="Log contents.")
def get_generation(self):
"""
Return the current generation.
"""
gens = self.map(lambda x: x[0])
if not gens:
return 0
return max(gens)
def get_generation_info(self):
"""
Return the current generation and transaction id.
"""
if not self._log:
return(0, '')
info = self.map(lambda x: (x[0], x[2]))
return reduce(lambda x, y: x if (x[0] > y[0]) else y, info)
def get_trans_id_for_gen(self, gen):
"""
Get the transaction id corresponding to a particular generation.
"""
log = self.reduce(lambda x, y: y if y[0] == gen else x)
if log is None:
return None
return log[2]
def whats_changed(self, old_generation):
"""
Return a list of documents that have changed since old_generation.
"""
results = self.filter(lambda x: x[0] > old_generation)
seen = set()
changes = []
newest_trans_id = ''
for generation, doc_id, trans_id in results:
if doc_id not in seen:
changes.append((doc_id, generation, trans_id))
seen.add(doc_id)
if changes:
cur_gen = changes[0][1] # max generation
newest_trans_id = changes[0][2]
changes.reverse()
else:
results = self.log
if not results:
cur_gen = 0
newest_trans_id = ''
else:
cur_gen, _, newest_trans_id = results[0]
return cur_gen, newest_trans_id, changes
class SyncLog(SimpleLog):
"""
A list of (replica_id, generation, transaction_id) tuples.
"""
def find_by_replica_uid(self, replica_uid):
if not self.log:
return ()
return self.reduce(lambda x, y: y if y[0] == replica_uid else x)
def get_replica_gen_and_trans_id(self, other_replica_uid):
"""
Return the last known generation and transaction id for the other db
replica.
"""
info = self.find_by_replica_uid(other_replica_uid)
if not info:
return (0, '')
return (info[1], info[2])
def set_replica_gen_and_trans_id(self, other_replica_uid,
other_generation, other_transaction_id):
"""
Set the last-known generation and transaction id for the other
database replica.
"""
self.log = self.filter(lambda x: x[0] != other_replica_uid)
self.append((other_replica_uid, other_generation,
other_transaction_id))
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