def getBlob(self, identifier, try_diskcache=True, try_vault=True):
'''get a blob (unidentified media data)
@raise KeyError: if reading the data of the identifier went wrong
'''
filelike=None
if try_diskcache:
filelike = self.doc_diskcache.get(identifier)
if not filelike and try_vault and identifier:
try:
filelike = self.vault.get(identifier)
except KeyError as exceptobj:
raise
if hasattr(filelike, "name"):
inputfilename = filelike.name
else:
inputfilename = tempfilecopy(filelike)
try:
osdescriptor, decryptedfilename = tempfile.mkstemp(); os.close(osdescriptor)
decrypt_verify(inputfilename, decryptedfilename, settings.STORAGE_DECRYPT["gpghome"],
settings.STORAGE_DECRYPT ["owner"])
except IOError as exceptobj:
raise KeyError, "could not decrypt blob with identifier %s, exception was %r" % (identifier, exceptobj)
try:
with open(decryptedfilename, "rb") as decryptedfilelike:
self.doc_diskcache.create_or_update(identifier, decryptedfilelike)
except IOError as exceptobj:
raise KeyError, "could not put decrypted blob with identifier %s into diskcache, exception was %r" %(identifier, exceptobj)
filelike = self.doc_diskcache.get(identifier)
return filelike
def render_pages(identifier, filelike, private_workdir):
tiles = settings.MS_SHARED ["tiles"]
resolutions = settings.MS_SHARED ["resolutions"]
aspect_ratio = settings.MS_SHARED ["aspect_ratio"]
dpi = settings.MS_SHARED ["dpi"]
depth = settings.MS_SHARED ["depth"]
copied_file = False
if hasattr(filelike,"name"):
tmp_sourcefilename = filelike.name
elif hasattr(filelike, "read"):
tmp_sourcefilename = tempfilecopy(filelike)
copied_file = True
try:
for t in tiles:
for w in resolutions:
for page, data in pdf2pngs(identifier, tmp_sourcefilename, private_workdir, w, t, t, aspect_ratio, dpi, depth):
yield page, data
finally:
if copied_file:
if os.path.exists(tmp_sourcefilename):
os.remove(tmp_sourcefilename)
