Commit c64367d6 authored by Guido van Rossum's avatar Guido van Rossum

Made a start with more docstrings. But I got interrupted by the

following item:

Picklers are not re-entrant!  The only place where the shared global
pickler was used was in the error handling in store(), to test whether
the caught exception can be pickled (else it would fail when sending
the response).  Change the flow control to create a new pickler
locally, only when an exception is caught.  (When no exception is
caught, we know newserial is a string so there's no need to test its
picklability.)
parent ddbd0185
...@@ -11,7 +11,7 @@ ...@@ -11,7 +11,7 @@
# FOR A PARTICULAR PURPOSE # FOR A PARTICULAR PURPOSE
# #
############################################################################## ##############################################################################
"""Network ZODB storage server """The StorageServer class and the exception that it may raise.
This server acts as a front-end for one or more real storages, like This server acts as a front-end for one or more real storages, like
file storage or Berkeley storage. file storage or Berkeley storage.
...@@ -37,19 +37,15 @@ from ZODB.POSException import TransactionError, ReadOnlyError ...@@ -37,19 +37,15 @@ from ZODB.POSException import TransactionError, ReadOnlyError
from ZODB.referencesf import referencesf from ZODB.referencesf import referencesf
from ZODB.Transaction import Transaction from ZODB.Transaction import Transaction
# We create a special fast pickler! This allows us _label = "ZSS" # Default label used for logging.
# to create slightly more efficient pickles and
# to create them a tad faster.
pickler = cPickle.Pickler()
pickler.fast = 1 # Don't use the memo
dump = pickler.dump
_label = "ZSS"
def set_label(): def set_label():
"""Internal helper to reset the logging label (e.g. after fork())."""
global _label global _label
_label = "ZSS:%s" % os.getpid() _label = "ZSS:%s" % os.getpid()
def log(message, level=zLOG.INFO, label=None, error=None): def log(message, level=zLOG.INFO, label=None, error=None):
"""Internal helper to log a message using zLOG."""
zLOG.LOG(label or _label, level, message, error=error) zLOG.LOG(label or _label, level, message, error=error)
class StorageServerError(StorageError): class StorageServerError(StorageError):
...@@ -499,28 +495,28 @@ class ImmediateCommitStrategy: ...@@ -499,28 +495,28 @@ class ImmediateCommitStrategy:
try: try:
newserial = self.storage.store(oid, serial, data, version, newserial = self.storage.store(oid, serial, data, version,
self.txn) self.txn)
except TransactionError, err: except Exception, err:
# Storage errors are passed to the client if not isinstance(err, TransactionError):
# Unexpected errors are logged and passed to the client
exc_info = sys.exc_info()
log("store error: %s, %s" % exc_info[:2],
zLOG.ERROR, error=exc_info)
del exc_info
# 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)
log(msg, zLOG.ERROR)
err = StorageServerError(msg)
# The exception is reported back as newserial for this oid
newserial = err newserial = err
except Exception:
# Unexpected storage errors are logged and passed to the client
exc_info = sys.exc_info()
log("store error: %s, %s" % exc_info[:2],
zLOG.ERROR, error=exc_info)
newserial = exc_info[1]
del exc_info
else: else:
if serial != "\0\0\0\0\0\0\0\0": if serial != "\0\0\0\0\0\0\0\0":
self.invalidated.append((oid, version)) self.invalidated.append((oid, version))
try:
dump(newserial, 1)
except:
msg = "Couldn't pickle storage exception: %s" % repr(newserial)
log(msg, zLOG.ERROR)
dump('', 1) # clear pickler
r = StorageServerError(msg)
newserial = r
self.serials.append((oid, newserial)) self.serials.append((oid, newserial))
def commitVersion(self, src, dest): def commitVersion(self, src, dest):
......
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