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download.py: refactor get-thingA-from-somebody to reuse the logic for other things

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This commit is contained in:
Brian Warner 2007-06-06 23:50:02 -07:00
parent dcf5abb51c
commit fae4e8f9a3
1 changed files with 21 additions and 11 deletions
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32
src/allmydata/download.py
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@ -301,27 +301,37 @@ class FileDownloader:
# assert isinstance(vb, ValidatedBucket), \
# "vb is %s but should be a ValidatedBucket" % (vb,)
def _obtain_thingA(self, ignored=None):
def _obtain_thingA(self, ignored):
# all shareholders are supposed to have a copy of thingA, and all are
# supposed to be identical. We compute the hash of the data that
# comes back, and compare it against the version in our URI. If they
# don't match, ignore their data and try someone else.
if not self._thingA_sources:
raise NotEnoughPeersError("ran out of peers while fetching thingA")
bucket = self._thingA_sources.pop()
d = bucket.callRemote("get_thingA")
def _got(thingA):
h = hashtree.thingA_hash(thingA)
def _validate(proposal, bucket):
h = hashtree.thingA_hash(proposal)
if h != self._thingA_hash:
msg = ("The copy of thingA we received from %s was bad" %
bucket)
raise BadThingAHashValue(msg)
return bencode.bdecode(thingA)
d.addCallback(_got)
return bencode.bdecode(proposal)
return self._obtain_validated_thing(None,
self._thingA_sources,
"thingA",
"get_thingA", (), _validate)
def _obtain_validated_thing(self, ignored, sources, name, methname, args,
validatorfunc):
if not sources:
raise NotEnoughPeersError("ran out of peers while fetching %s" %
name)
bucket = sources[0]
sources = sources[1:]
d = bucket.callRemote(methname, *args)
d.addCallback(validatorfunc, bucket)
def _bad(f):
log.msg("thingA from vbucket %s failed: %s" % (bucket, f)) # WEIRD
log.msg("%s from vbucket %s failed: %s" % (name, bucket, f)) # WEIRD
# try again with a different one
return self._obtain_thingA()
return self._obtain_validated_thing(None, sources, name,
methname, args, validatorfunc)
d.addErrback(_bad)
return d