def reloadContext(self, filename):
"""update the context to contain the contents of the
file. There may be a time when the context is partially empty
or partially full.
filename is relative to inputDirectory"""
ctx = contextFromFilename(filename, self.contextPrefix,
self.inputDirectory)
log.debug("reloading %s", ctx)
try:
ext = os.path.splitext(filename)[1].replace('.', '')
self.graph.safeParse(filename, publicID=ctx, format=ext)
self.setLastImportTime(ctx, datetime.datetime.now(tzlocal()),
filename)
except (xml.sax._exceptions.SAXParseException,
ParseError), e:
log.warn("parse error reading file. (%s)", e)
def fileDisappeared(self, filename):
"""
this file is no longer on disk; drop its graph and bookkeeping triples
"""
# there's a bug where this was making ValueError since the
# filename wasn't underneath the input directory. The bug
# is that the polling stops on the first error, requiring
# a db restart.
try:
ctx = contextFromFilename(filename, self.contextPrefix,
self.inputDirectory)
except ValueError:
# if we can't figure out the context, it might be
# because this filename is handled by a different
# SyncImport with another inputDirectory, which is
# cool
return
log.info("input file %s disappeared, clearing %s" % (filename, ctx))
self.graph.subgraphClear(ctx)
self.removeImportRecord(ctx)
def fileIsUpdated(self, filename):
"""is the file's mtime newer than when we last imported it"""
try:
try:
ctx = contextFromFilename(filename, self.contextPrefix,
self.inputDirectory)
except ValueError, e:
self._logFileError(filename, log.debug,
"filename %s doesn't tell us a context- "
"skipping (%s)" % (filename, e))
return False
# we get the mtime of the target file, not a symlink
mtime = datetime.datetime.fromtimestamp(
os.path.getmtime(os.path.realpath(filename)), tzlocal())
last = self.lastImportTime(ctx)
if not last or last < mtime:
log.debug("%s < %s, file %s is updated" %
(last.isoformat() if last else 'None',
mtime.isoformat(), filename))
return True
def reloadContextSesame(self, filename):
"""a version that just uploads the file to sesame for parsing
and graph replacement. Currently using internal APIs;
loadFromFile should be made public"""
ctx = contextFromFilename(filename, self.contextPrefix,
self.inputDirectory)
log.debug("reloading %s", ctx)
assert filename.endswith(('.n3', '.nt'))
n3 = open(filename).read()
# rdflib makes prefixes like _1; sesame rejects them. This
# might match unexpected stuff!
n3 = re.sub(r'_(\d+):', lambda m: 'prefix_%s:' % m.group(1), n3)
now = datetime.datetime.now(tzlocal())
try:
self.graph._request("PUT", path="/statements",
queryParams={'context' : ctx.n3()},
payload=n3,
headers={'Content-Type' : 'text/rdf+n3'})
self.setLastImportTime(ctx, now, filename)
except KeyboardInterrupt: raise
except Exception, e:
log.error("while trying to reload:\n%s", traceback.format_exc())
