def _fetchContentMap(binary_record):
"""Map function of fetch content.
Fetched content will store to blobstore.
Arg:
binary_record: key value data, that key is url of target page,
value is url of target of fetch.
Returns:
url: fetched url.
"""
proto = file_service_pb.KeyValue()
proto.ParseFromString(binary_record)
page_url = proto.key()
target_url = proto.value()
#Fetch to CrawlDbDatum
try:
query = CrawlDbDatum.query(CrawlDbDatum.url == page_url)
crawl_db_datum_future = query.fetch_async()
except Exception as e:
logging.warning("Failed create key, caused by invalid url:" +
page_url + ":" + e.message)
#start fetch
fetcher = fetchers.SimpleHttpFetcher(1, fetcher_policy_yaml.fetcher_policy)
stored_url = None
if re.match("^/", target_url):
crawl_db_datum = _getCrawlDatum(crawl_db_datum_future)
target_url = "%s%s" % (crawl_db_datum.extract_domain_url, target_url)
try:
fetch_result = fetcher.get(target_url)
if fetch_result:
#Storing to blobstore
blob_io = files.blobstore.create(
mime_type=fetch_result.get("mime_type"),
_blobinfo_uploaded_filename=fetch_result.get("fetched_url"))
with files.open(blob_io, 'a') as f:
f.write(fetch_result.get("content"))
files.finalize(blob_io)
blob_key = files.blobstore.get_blob_key(blob_io)
stored_url = images.get_serving_url(str(blob_key))
except Exception as e:
logging.warning("Fetch Error Occurs:" + e.message)
#Put content to datastore.
crawl_db_datum = _getCrawlDatum(crawl_db_datum_future)
if crawl_db_datum and stored_url is not None:
entity = ContentDbDatum(
parent=crawl_db_datum.key,
fetched_url=fetch_result.get("fetched_url"),
stored_url=stored_url,
content_type=fetch_result.get("mime_type"),
content_size=fetch_result.get("content_length"),
http_headers=str(fetch_result.get("headers")))
entity.put()
yield "%s:%s" % (target_url, stored_url)
