def refresh(self):
with self._syncRoot:
lines = self._metaRW.readlines()
self.log.debug("read lines (%s)=%s",
self._metaRW.__class__.__name__, lines)
newMD = {}
declaredChecksum = None
for line in lines:
try:
key, value = line.split("=", 1)
value = value.strip()
except ValueError:
self.log.warn("Could not parse line `%s`.", line)
continue
if key == SHA_CKSUM_TAG:
declaredChecksum = value
continue
newMD[key] = value
if not newMD:
self.log.debug("Empty metadata")
self._isValid = True
self._metadata = newMD
return
if declaredChecksum is None:
# No checksum in the metadata, let it through as is
# FIXME : This is ugly but necessary, What we need is a class
# method that creates the initial metadata. Then we can assume
# that empty metadata is always invalid.
self.log.warn("data has no embedded checksum - "
"trust it as it is")
self._isValid = True
self._metadata = newMD
return
checksumCalculator = hashlib.sha1()
keys = newMD.keys()
keys.sort()
for key in keys:
value = newMD[key]
line = "%s=%s" % (key, value)
checksumCalculator.update(_preprocessLine(line))
computedChecksum = checksumCalculator.hexdigest()
if declaredChecksum != computedChecksum:
self.log.warning(
"data seal is broken metadata declares `%s` "
"should be `%s` (lines=%s)", declaredChecksum,
computedChecksum, newMD)
raise se.MetaDataSealIsBroken(declaredChecksum,
computedChecksum)
self._isValid = True
self._metadata = newMD
def _refresh(self):
with self._syncRoot:
lines = self._metaRW.readlines()
log.debug("read lines (%s)=%s",
self._metaRW.__class__.__name__,
lines)
newMD = _parse_lines(lines)
declaredChecksum = newMD.pop(SHA_CKSUM_TAG, None)
if not newMD:
log.debug("Empty metadata")
self._isValid = True
self._metadata = newMD
return
if declaredChecksum is None:
# No checksum in the metadata, let it through as is
# FIXME : This is ugly but necessary, What we need is a class
# method that creates the initial metadata. Then we can assume
# that empty metadata is always invalid.
log.warning("data has no embedded checksum - "
"trust it as it is")
self._isValid = True
self._metadata = newMD
return
computedChecksum = _calc_checksum(_dump_lines(newMD))
if declaredChecksum != computedChecksum:
log.warning("data seal is broken metadata declares `%s` "
"should be `%s` (lines=%s)",
declaredChecksum, computedChecksum, newMD)
raise se.MetaDataSealIsBroken(declaredChecksum,
computedChecksum)
self._isValid = True
self._metadata = newMD