def png_fetch(self, ucid, seq=1):
log.info(
u"{backend_name}: png_fetch, ucid={ucid}, seq={seq}; user={username}"
.format(ucid=ucid, seq=seq, **self.__dict__))
tif = self.tif_fetch(ucid, seq)
if tif:
png = to_png(tif)
return png
def get_drawing_png(document, page, kind):
# 2. Try to fetch drawing from OPS, fall back to other patent offices
try:
payload = get_ops_image(document, page, kind, 'tiff')
except HTTPNotFound:
# fallback to USPTO (U.S.)
if document.upper().startswith('US'):
document_id = normalize_patent(split_patent_number(document),
for_ops=False)
try:
payload = get_uspto_image_cached(document_id)
except PayloadEmpty as ex:
raise HTTPNotFound(
'No drawing for "{0}" at OPS or USPTO'.format(document))
# fallback to CIPO (Canada)
elif document.upper().startswith('CA'):
document_id = split_patent_number(document)
try:
payload = get_cipo_image_cached(document_id)
except PayloadEmpty as ex:
raise HTTPNotFound(
'No drawing for "{0}" at OPS or CIPO'.format(document))
# otherwise, pass through exception
else:
raise
# 3. Croak if no image available
if not payload:
msg = 'No image available for document={document}, kind={kind}, page={page}'.format(
**locals())
log.warn(msg)
raise HTTPNotFound(msg)
# 4. Convert image from TIFF to PNG format
payload = to_png(BytesIO(payload))
return payload