def tpc_begin(self, id, user, description, ext, tid=None, status=" "):
if self.read_only:
raise ReadOnlyError()
if self.transaction is not None:
if self.transaction.id == id:
self.log("duplicate tpc_begin(%s)" % repr(id))
return
else:
raise StorageTransactionError("Multiple simultaneous tpc_begin"
" requests from one client.")
self.transaction = t = transaction.Transaction()
t.id = id
t.user = user
t.description = description
t._extension = ext
self.serials = []
self.invalidated = []
self.txnlog = CommitLog()
self.tid = tid
self.status = status
self.store_failed = 0
self.stats.active_txns += 1
class ZEOStorage:
"""Proxy to underlying storage for a single remote client."""
# Classes we instantiate. A subclass might override.
ClientStorageStubClass = ClientStub.ClientStorage
# A list of extension methods. A subclass with extra methods
# should override.
extensions = []
def __init__(self, server, read_only=0, auth_realm=None):
self.server = server
# timeout and stats will be initialized in register()
self.timeout = None
self.stats = None
self.connection = None
self.client = None
self.storage = None
self.storage_id = "uninitialized"
self.transaction = None
self.read_only = read_only
self.locked = 0
self.verifying = 0
self.store_failed = 0
self.log_label = _label
self.authenticated = 0
self.auth_realm = auth_realm
self.blob_tempfile = None
self.blob_log = []
# The authentication protocol may define extra methods.
self._extensions = {}
for func in self.extensions:
self._extensions[func.func_name] = None
def finish_auth(self, authenticated):
if not self.auth_realm:
return 1
self.authenticated = authenticated
return authenticated
def set_database(self, database):
self.database = database
def notifyConnected(self, conn):
self.connection = conn # For restart_other() below
self.client = self.ClientStorageStubClass(conn)
addr = conn.addr
if isinstance(addr, type("")):
label = addr
else:
host, port = addr
label = str(host) + ":" + str(port)
self.log_label = _label + "/" + label
def notifyDisconnected(self):
# When this storage closes, we must ensure that it aborts
# any pending transaction.
if self.transaction is not None:
self.log("disconnected during transaction %s" % self.transaction)
self._abort()
else:
self.log("disconnected")
if self.stats is not None:
self.stats.clients -= 1
def __repr__(self):
tid = self.transaction and repr(self.transaction.id)
if self.storage:
stid = (self.tpc_transaction() and repr(self.tpc_transaction().id))
else:
stid = None
name = self.__class__.__name__
return "<%s %X trans=%s s_trans=%s>" % (name, id(self), tid, stid)
def log(self, msg, level=logging.INFO, exc_info=False):
log(msg, level=level, label=self.log_label, exc_info=exc_info)
def setup_delegation(self):
"""Delegate several methods to the storage
"""
storage = self.storage
info = self.get_info()
if info['supportsVersions']:
self.versionEmpty = storage.versionEmpty
self.versions = storage.versions
self.modifiedInVersion = storage.modifiedInVersion
else:
self.versionEmpty = lambda version: True
self.versions = lambda max=None: ()
self.modifiedInVersion = lambda oid: ''
def commitVersion(*a, **k):
raise NotImplementedError
self.commitVersion = self.abortVersion = commitVersion
if not info['supportsUndo']:
self.undoLog = self.undoInfo = lambda *a, **k: ()
def undo(*a, **k):
raise NotImplementedError
self.undo = undo
self.getTid = storage.getTid
self.history = storage.history
self.load = storage.load
self.loadSerial = storage.loadSerial
record_iternext = getattr(storage, 'record_iternext', None)
if record_iternext is not None:
self.record_iternext = record_iternext
try:
fn = storage.getExtensionMethods
except AttributeError:
pass # no extension methods
else:
d = fn()
self._extensions.update(d)
for name in d:
assert not hasattr(self, name)
setattr(self, name, getattr(storage, name))
self.lastTransaction = storage.lastTransaction
try:
self.tpc_transaction = storage.tpc_transaction
except AttributeError:
if hasattr(storage, '_transaction'):
log(
"Storage %r doesn't have a tpc_transaction method.\n"
"See ZEO.interfaces.IServeable."
"Falling back to using _transaction attribute, which\n."
"is icky.", logging.ERROR)
self.tpc_transaction = lambda: storage._transaction
else:
raise
def _check_tid(self, tid, exc=None):
if self.read_only:
raise ReadOnlyError()
if self.transaction is None:
caller = sys._getframe().f_back.f_code.co_name
self.log("no current transaction: %s()" % caller,
level=logging.WARNING)
if exc is not None:
raise exc(None, tid)
else:
return 0
if self.transaction.id != tid:
caller = sys._getframe().f_back.f_code.co_name
self.log(
"%s(%s) invalid; current transaction = %s" %
(caller, repr(tid), repr(self.transaction.id)),
logging.WARNING)
if exc is not None:
raise exc(self.transaction.id, tid)
else:
return 0
return 1
def getAuthProtocol(self):
"""Return string specifying name of authentication module to use.
The module name should be auth_%s where %s is auth_protocol."""
protocol = self.server.auth_protocol
if not protocol or protocol == 'none':
return None
return protocol
def register(self, storage_id, read_only):
"""Select the storage that this client will use
This method must be the first one called by the client.
For authenticated storages this method will be called by the client
immediately after authentication is finished.
"""
if self.auth_realm and not self.authenticated:
raise AuthError("Client was never authenticated with server!")
if self.storage is not None:
self.log("duplicate register() call")
raise ValueError("duplicate register() call")
storage = self.server.storages.get(storage_id)
if storage is None:
self.log("unknown storage_id: %s" % storage_id)
raise ValueError("unknown storage: %s" % storage_id)
if not read_only and (self.read_only or storage.isReadOnly()):
raise ReadOnlyError()
self.read_only = self.read_only or read_only
self.storage_id = storage_id
self.storage = storage
self.setup_delegation()
self.timeout, self.stats = self.server.register_connection(
storage_id, self)
def get_info(self):
storage = self.storage
try:
supportsVersions = storage.supportsVersions
except AttributeError:
supportsVersions = False
else:
supportsVersions = supportsVersions()
try:
supportsUndo = storage.supportsUndo
except AttributeError:
supportsUndo = False
else:
supportsUndo = supportsUndo()
return {
'length': len(storage),
'size': storage.getSize(),
'name': storage.getName(),
'supportsUndo': supportsUndo,
'supportsVersions': supportsVersions,
'extensionMethods': self.getExtensionMethods(),
'supports_record_iternext': hasattr(self, 'record_iternext'),
}
def get_size_info(self):
return {
'length': len(self.storage),
'size': self.storage.getSize(),
}
def getExtensionMethods(self):
return self._extensions
def loadEx(self, oid, version):
self.stats.loads += 1
if version:
oversion = self.storage.modifiedInVersion(oid)
if oversion == version:
data, serial = self.storage.load(oid, version)
return data, serial, version
data, serial = self.storage.load(oid, '')
return data, serial, ''
def loadBefore(self, oid, tid):
self.stats.loads += 1
return self.storage.loadBefore(oid, tid)
def zeoLoad(self, oid):
self.stats.loads += 1
v = self.storage.modifiedInVersion(oid)
if v:
pv, sv = self.storage.load(oid, v)
else:
pv = sv = None
try:
p, s = self.storage.load(oid, '')
except KeyError:
if sv:
# Created in version, no non-version data
p = s = None
else:
raise
return p, s, v, pv, sv
def getInvalidations(self, tid):
invtid, invlist = self.server.get_invalidations(self.storage_id, tid)
if invtid is None:
return None
self.log("Return %d invalidations up to tid %s" %
(len(invlist), u64(invtid)))
return invtid, invlist
def verify(self, oid, version, tid):
try:
t = self.getTid(oid)
except KeyError:
self.client.invalidateVerify((oid, ""))
else:
if tid != t:
# This will invalidate non-version data when the
# client only has invalid version data. Since this is
# an uncommon case, we avoid the cost of checking
# whether the serial number matches the current
# non-version data.
self.client.invalidateVerify((oid, version))
def zeoVerify(self, oid, s, sv):
if not self.verifying:
self.verifying = 1
self.stats.verifying_clients += 1
try:
os = self.getTid(oid)
except KeyError:
self.client.invalidateVerify((oid, ''))
# It's not clear what we should do now. The KeyError
# could be caused by an object uncreation, in which case
# invalidation is right. It could be an application bug
# that left a dangling reference, in which case it's bad.
else:
# If the client has version data, the logic is a bit more
# complicated. If the current serial number matches the
# client serial number, then the non-version data must
# also be valid. If the current serialno is for a
# version, then the non-version data can't change.
# If the version serialno isn't valid, then the
# non-version serialno may or may not be valid. Rather
# than trying to figure it whether it is valid, we just
# invalidate it. Sending an invalidation for the
# non-version data implies invalidating the version data
# too, since an update to non-version data can only occur
# after the version is aborted or committed.
if sv:
if sv != os:
self.client.invalidateVerify((oid, ''))
else:
if s != os:
self.client.invalidateVerify((oid, ''))
def endZeoVerify(self):
if self.verifying:
self.stats.verifying_clients -= 1
self.verifying = 0
self.client.endVerify()
def pack(self, time, wait=1):
# Yes, you can pack a read-only server or storage!
if wait:
return run_in_thread(self._pack_impl, time)
else:
# If the client isn't waiting for a reply, start a thread
# and forget about it.
t = threading.Thread(target=self._pack_impl, args=(time, ))
t.start()
return None
def _pack_impl(self, time):
self.log("pack(time=%s) started..." % repr(time))
self.storage.pack(time, referencesf)
self.log("pack(time=%s) complete" % repr(time))
# Broadcast new size statistics
self.server.invalidate(0, self.storage_id, None, (),
self.get_size_info())
def new_oids(self, n=100):
"""Return a sequence of n new oids, where n defaults to 100"""
if self.read_only:
raise ReadOnlyError()
if n <= 0:
n = 1
return [self.storage.new_oid() for i in range(n)]
# undoLog and undoInfo are potentially slow methods
def undoInfo(self, first, last, spec):
return run_in_thread(self.storage.undoInfo, first, last, spec)
def undoLog(self, first, last):
return run_in_thread(self.storage.undoLog, first, last)
def tpc_begin(self, id, user, description, ext, tid=None, status=" "):
if self.read_only:
raise ReadOnlyError()
if self.transaction is not None:
if self.transaction.id == id:
self.log("duplicate tpc_begin(%s)" % repr(id))
return
else:
raise StorageTransactionError("Multiple simultaneous tpc_begin"
" requests from one client.")
self.transaction = t = transaction.Transaction()
t.id = id
t.user = user
t.description = description
t._extension = ext
self.serials = []
self.invalidated = []
self.txnlog = CommitLog()
self.tid = tid
self.status = status
self.store_failed = 0
self.stats.active_txns += 1
def tpc_finish(self, id):
if not self._check_tid(id):
return
assert self.locked
self.stats.active_txns -= 1
self.stats.commits += 1
self.storage.tpc_finish(self.transaction)
tid = self.storage.lastTransaction()
if self.invalidated:
self.server.invalidate(self, self.storage_id, tid,
self.invalidated, self.get_size_info())
self._clear_transaction()
# Return the tid, for cache invalidation optimization
return tid
def tpc_abort(self, id):
if not self._check_tid(id):
return
self.stats.active_txns -= 1
self.stats.aborts += 1
if self.locked:
self.storage.tpc_abort(self.transaction)
self._clear_transaction()
def _clear_transaction(self):
# Common code at end of tpc_finish() and tpc_abort()
self.transaction = None
self.txnlog.close()
if self.locked:
self.locked = 0
self.timeout.end(self)
self.stats.lock_time = None
self.log("Transaction released storage lock", BLATHER)
# _handle_waiting() can start another transaction (by
# restarting a waiting one) so must be done last
self._handle_waiting()
def _abort(self):
# called when a connection is closed unexpectedly
if not self.locked:
# Delete (d, zeo_storage) from the _waiting list, if found.
waiting = self.storage._waiting
for i in range(len(waiting)):
d, z = waiting[i]
if z is self:
del waiting[i]
self.log("Closed connection removed from waiting list."
" Clients waiting: %d." % len(waiting))
break
if self.transaction:
self.stats.active_txns -= 1
self.stats.aborts += 1
self.tpc_abort(self.transaction.id)
# The public methods of the ZEO client API do not do the real work.
# They defer work until after the storage lock has been acquired.
# Most of the real implementations are in methods beginning with
# an _.
def storea(self, oid, serial, data, version, id):
self._check_tid(id, exc=StorageTransactionError)
self.stats.stores += 1
self.txnlog.store(oid, serial, data, version)
def storeBlobStart(self):
assert self.blob_tempfile is None
self.blob_tempfile = tempfile.mkstemp(
dir=self.storage.temporaryDirectory())
def storeBlobChunk(self, chunk):
os.write(self.blob_tempfile[0], chunk)
def storeBlobEnd(self, oid, serial, data, version, id):
fd, tempname = self.blob_tempfile
self.blob_tempfile = None
os.close(fd)
self.blob_log.append((oid, serial, data, tempname, version))
def storeBlobShared(self, oid, serial, data, filename, version, id):
# Reconstruct the full path from the filename in the OID directory
filename = os.path.join(self.storage.fshelper.getPathForOID(oid),
filename)
self.blob_log.append((oid, serial, data, filename, version))
def sendBlob(self, oid, serial):
self.client.storeBlob(oid, serial, self.storage.loadBlob(oid, serial))
# The following four methods return values, so they must acquire
# the storage lock and begin the transaction before returning.
def vote(self, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._vote()
else:
return self._wait(lambda: self._vote())
def abortVersion(self, src, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._abortVersion(src)
else:
return self._wait(lambda: self._abortVersion(src))
def commitVersion(self, src, dest, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._commitVersion(src, dest)
else:
return self._wait(lambda: self._commitVersion(src, dest))
def undo(self, trans_id, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._undo(trans_id)
else:
return self._wait(lambda: self._undo(trans_id))
def _tpc_begin(self, txn, tid, status):
self.locked = 1
self.timeout.begin(self)
self.stats.lock_time = time.time()
self.storage.tpc_begin(txn, tid, status)
def _store(self, oid, serial, data, version):
err = None
try:
newserial = self.storage.store(oid, serial, data, version,
self.transaction)
except (SystemExit, KeyboardInterrupt):
raise
except Exception, err:
self.store_failed = 1
if isinstance(err, ConflictError):
self.stats.conflicts += 1
self.log(
"conflict error oid=%s msg=%s" % (oid_repr(oid), str(err)),
BLATHER)
if not isinstance(err, TransactionError):
# Unexpected errors are logged and passed to the client
self.log("store error: %s, %s" % sys.exc_info()[:2],
logging.ERROR,
exc_info=True)
# Try to pickle the exception. If it can't be pickled,
# the RPC response would fail, so use something else.
pickler = cPickle.Pickler()
pickler.fast = 1
try:
pickler.dump(err, 1)
except:
msg = "Couldn't pickle storage exception: %s" % repr(err)
self.log(msg, logging.ERROR)
err = StorageServerError(msg)
# The exception is reported back as newserial for this oid
newserial = [(oid, err)]
else:
class ZEOStorage:
"""Proxy to underlying storage for a single remote client."""
# Classes we instantiate. A subclass might override.
ClientStorageStubClass = ClientStub.ClientStorage
# A list of extension methods. A subclass with extra methods
# should override.
extensions = []
def __init__(self, server, read_only=0, auth_realm=None):
self.server = server
# timeout and stats will be initialized in register()
self.timeout = None
self.stats = None
self.connection = None
self.client = None
self.storage = None
self.storage_id = "uninitialized"
self.transaction = None
self.read_only = read_only
self.locked = 0
self.verifying = 0
self.store_failed = 0
self.log_label = _label
self.authenticated = 0
self.auth_realm = auth_realm
# The authentication protocol may define extra methods.
self._extensions = {}
for func in self.extensions:
self._extensions[func.func_name] = None
def finish_auth(self, authenticated):
if not self.auth_realm:
return 1
self.authenticated = authenticated
return authenticated
def set_database(self, database):
self.database = database
def notifyConnected(self, conn):
self.connection = conn # For restart_other() below
self.client = self.ClientStorageStubClass(conn)
addr = conn.addr
if isinstance(addr, type("")):
label = addr
else:
host, port = addr
label = str(host) + ":" + str(port)
self.log_label = _label + "/" + label
def notifyDisconnected(self):
# When this storage closes, we must ensure that it aborts
# any pending transaction.
if self.transaction is not None:
self.log("disconnected during transaction %s" % self.transaction)
self._abort()
else:
self.log("disconnected")
if self.stats is not None:
self.stats.clients -= 1
def __repr__(self):
tid = self.transaction and repr(self.transaction.id)
if self.storage:
stid = (self.storage._transaction and
repr(self.storage._transaction.id))
else:
stid = None
name = self.__class__.__name__
return "<%s %X trans=%s s_trans=%s>" % (name, id(self), tid, stid)
def log(self, msg, level=logging.INFO, exc_info=False):
log(msg, level=level, label=self.log_label, exc_info=exc_info)
def setup_delegation(self):
"""Delegate several methods to the storage"""
self.versionEmpty = self.storage.versionEmpty
self.versions = self.storage.versions
self.getSerial = self.storage.getSerial
self.history = self.storage.history
self.load = self.storage.load
self.loadSerial = self.storage.loadSerial
self.modifiedInVersion = self.storage.modifiedInVersion
try:
fn = self.storage.getExtensionMethods
except AttributeError:
# We must be running with a ZODB which
# predates adding getExtensionMethods to
# BaseStorage. Eventually this try/except
# can be removed
pass
else:
d = fn()
self._extensions.update(d)
for name in d.keys():
assert not hasattr(self, name)
setattr(self, name, getattr(self.storage, name))
self.lastTransaction = self.storage.lastTransaction
def _check_tid(self, tid, exc=None):
if self.read_only:
raise ReadOnlyError()
if self.transaction is None:
caller = sys._getframe().f_back.f_code.co_name
self.log("no current transaction: %s()" % caller,
level=logging.WARNING)
if exc is not None:
raise exc(None, tid)
else:
return 0
if self.transaction.id != tid:
caller = sys._getframe().f_back.f_code.co_name
self.log("%s(%s) invalid; current transaction = %s" %
(caller, repr(tid), repr(self.transaction.id)),
logging.WARNING)
if exc is not None:
raise exc(self.transaction.id, tid)
else:
return 0
return 1
def getAuthProtocol(self):
"""Return string specifying name of authentication module to use.
The module name should be auth_%s where %s is auth_protocol."""
protocol = self.server.auth_protocol
if not protocol or protocol == 'none':
return None
return protocol
def register(self, storage_id, read_only):
"""Select the storage that this client will use
This method must be the first one called by the client.
For authenticated storages this method will be called by the client
immediately after authentication is finished.
"""
if self.auth_realm and not self.authenticated:
raise AuthError("Client was never authenticated with server!")
if self.storage is not None:
self.log("duplicate register() call")
raise ValueError("duplicate register() call")
storage = self.server.storages.get(storage_id)
if storage is None:
self.log("unknown storage_id: %s" % storage_id)
raise ValueError("unknown storage: %s" % storage_id)
if not read_only and (self.read_only or storage.isReadOnly()):
raise ReadOnlyError()
self.read_only = self.read_only or read_only
self.storage_id = storage_id
self.storage = storage
self.setup_delegation()
self.timeout, self.stats = self.server.register_connection(storage_id,
self)
def get_info(self):
return {'length': len(self.storage),
'size': self.storage.getSize(),
'name': self.storage.getName(),
'supportsUndo': self.storage.supportsUndo(),
'supportsVersions': self.storage.supportsVersions(),
'extensionMethods': self.getExtensionMethods(),
}
def get_size_info(self):
return {'length': len(self.storage),
'size': self.storage.getSize(),
}
def getExtensionMethods(self):
return self._extensions
def loadEx(self, oid, version):
self.stats.loads += 1
return self.storage.loadEx(oid, version)
def loadBefore(self, oid, tid):
self.stats.loads += 1
return self.storage.loadBefore(oid, tid)
def zeoLoad(self, oid):
self.stats.loads += 1
v = self.storage.modifiedInVersion(oid)
if v:
pv, sv = self.storage.load(oid, v)
else:
pv = sv = None
try:
p, s = self.storage.load(oid, '')
except KeyError:
if sv:
# Created in version, no non-version data
p = s = None
else:
raise
return p, s, v, pv, sv
def getInvalidations(self, tid):
invtid, invlist = self.server.get_invalidations(tid)
if invtid is None:
return None
self.log("Return %d invalidations up to tid %s"
% (len(invlist), u64(invtid)))
return invtid, invlist
def verify(self, oid, version, tid):
try:
t = self.storage.getTid(oid)
except KeyError:
self.client.invalidateVerify((oid, ""))
else:
if tid != t:
# This will invalidate non-version data when the
# client only has invalid version data. Since this is
# an uncommon case, we avoid the cost of checking
# whether the serial number matches the current
# non-version data.
self.client.invalidateVerify((oid, version))
def zeoVerify(self, oid, s, sv):
if not self.verifying:
self.verifying = 1
self.stats.verifying_clients += 1
try:
os = self.storage.getTid(oid)
except KeyError:
self.client.invalidateVerify((oid, ''))
# It's not clear what we should do now. The KeyError
# could be caused by an object uncreation, in which case
# invalidation is right. It could be an application bug
# that left a dangling reference, in which case it's bad.
else:
# If the client has version data, the logic is a bit more
# complicated. If the current serial number matches the
# client serial number, then the non-version data must
# also be valid. If the current serialno is for a
# version, then the non-version data can't change.
# If the version serialno isn't valid, then the
# non-version serialno may or may not be valid. Rather
# than trying to figure it whether it is valid, we just
# invalidate it. Sending an invalidation for the
# non-version data implies invalidating the version data
# too, since an update to non-version data can only occur
# after the version is aborted or committed.
if sv:
if sv != os:
self.client.invalidateVerify((oid, ''))
else:
if s != os:
self.client.invalidateVerify((oid, ''))
def endZeoVerify(self):
if self.verifying:
self.stats.verifying_clients -= 1
self.verifying = 0
self.client.endVerify()
def pack(self, time, wait=1):
# Yes, you can pack a read-only server or storage!
if wait:
return run_in_thread(self._pack_impl, time)
else:
# If the client isn't waiting for a reply, start a thread
# and forget about it.
t = threading.Thread(target=self._pack_impl, args=(time,))
t.start()
return None
def _pack_impl(self, time):
self.log("pack(time=%s) started..." % repr(time))
self.storage.pack(time, referencesf)
self.log("pack(time=%s) complete" % repr(time))
# Broadcast new size statistics
self.server.invalidate(0, self.storage_id, None,
(), self.get_size_info())
def new_oids(self, n=100):
"""Return a sequence of n new oids, where n defaults to 100"""
if self.read_only:
raise ReadOnlyError()
if n <= 0:
n = 1
return [self.storage.new_oid() for i in range(n)]
# undoLog and undoInfo are potentially slow methods
def undoInfo(self, first, last, spec):
return run_in_thread(self.storage.undoInfo, first, last, spec)
def undoLog(self, first, last):
return run_in_thread(self.storage.undoLog, first, last)
def tpc_begin(self, id, user, description, ext, tid=None, status=" "):
if self.read_only:
raise ReadOnlyError()
if self.transaction is not None:
if self.transaction.id == id:
self.log("duplicate tpc_begin(%s)" % repr(id))
return
else:
raise StorageTransactionError("Multiple simultaneous tpc_begin"
" requests from one client.")
self.transaction = t = transaction.Transaction()
t.id = id
t.user = user
t.description = description
t._extension = ext
self.serials = []
self.invalidated = []
self.txnlog = CommitLog()
self.tid = tid
self.status = status
self.store_failed = 0
self.stats.active_txns += 1
def tpc_finish(self, id):
if not self._check_tid(id):
return
assert self.locked
self.stats.active_txns -= 1
self.stats.commits += 1
self.storage.tpc_finish(self.transaction)
tid = self.storage.lastTransaction()
if self.invalidated:
self.server.invalidate(self, self.storage_id, tid,
self.invalidated, self.get_size_info())
self._clear_transaction()
# Return the tid, for cache invalidation optimization
return tid
def tpc_abort(self, id):
if not self._check_tid(id):
return
self.stats.active_txns -= 1
self.stats.aborts += 1
if self.locked:
self.storage.tpc_abort(self.transaction)
self._clear_transaction()
def _clear_transaction(self):
# Common code at end of tpc_finish() and tpc_abort()
self.transaction = None
self.txnlog.close()
if self.locked:
self.locked = 0
self.timeout.end(self)
self.stats.lock_time = None
self.log("Transaction released storage lock", BLATHER)
# _handle_waiting() can start another transaction (by
# restarting a waiting one) so must be done last
self._handle_waiting()
def _abort(self):
# called when a connection is closed unexpectedly
if not self.locked:
# Delete (d, zeo_storage) from the _waiting list, if found.
waiting = self.storage._waiting
for i in range(len(waiting)):
d, z = waiting[i]
if z is self:
del waiting[i]
self.log("Closed connection removed from waiting list."
" Clients waiting: %d." % len(waiting))
break
if self.transaction:
self.stats.active_txns -= 1
self.stats.aborts += 1
self.tpc_abort(self.transaction.id)
# The public methods of the ZEO client API do not do the real work.
# They defer work until after the storage lock has been acquired.
# Most of the real implementations are in methods beginning with
# an _.
def storea(self, oid, serial, data, version, id):
self._check_tid(id, exc=StorageTransactionError)
self.stats.stores += 1
self.txnlog.store(oid, serial, data, version)
# The following four methods return values, so they must acquire
# the storage lock and begin the transaction before returning.
def vote(self, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._vote()
else:
return self._wait(lambda: self._vote())
def abortVersion(self, src, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._abortVersion(src)
else:
return self._wait(lambda: self._abortVersion(src))
def commitVersion(self, src, dest, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._commitVersion(src, dest)
else:
return self._wait(lambda: self._commitVersion(src, dest))
def undo(self, trans_id, id):
self._check_tid(id, exc=StorageTransactionError)
if self.locked:
return self._undo(trans_id)
else:
return self._wait(lambda: self._undo(trans_id))
def _tpc_begin(self, txn, tid, status):
self.locked = 1
self.timeout.begin(self)
self.stats.lock_time = time.time()
self.storage.tpc_begin(txn, tid, status)
def _store(self, oid, serial, data, version):
err = None
try:
newserial = self.storage.store(oid, serial, data, version,
self.transaction)
except (SystemExit, KeyboardInterrupt):
raise
except Exception, err:
self.store_failed = 1
if isinstance(err, ConflictError):
self.stats.conflicts += 1
self.log("conflict error oid=%s msg=%s" %
(oid_repr(oid), str(err)), BLATHER)
if not isinstance(err, TransactionError):
# Unexpected errors are logged and passed to the client
self.log("store error: %s, %s" % sys.exc_info()[:2],
logging.ERROR, exc_info=True)
# Try to pickle the exception. If it can't be pickled,
# the RPC response would fail, so use something else.
pickler = cPickle.Pickler()
pickler.fast = 1
try:
pickler.dump(err, 1)
except:
msg = "Couldn't pickle storage exception: %s" % repr(err)
self.log(msg, logging.ERROR)
err = StorageServerError(msg)
# The exception is reported back as newserial for this oid
newserial = err
else: