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import sys
import json
import base64
import requests
from http.server import BaseHTTPRequestHandler, HTTPServer
from sandcrawler.ia import SavePageNowClient, CdxApiClient, WaybackClient, WaybackError, SavePageNowError, SavePageNowRemoteError, CdxApiError
from sandcrawler.grobid import GrobidClient
from sandcrawler.misc import gen_file_metadata
from sandcrawler.html import extract_fulltext_url
from sandcrawler.workers import SandcrawlerWorker
class IngestFileWorker(SandcrawlerWorker):
def __init__(self, sink=None, **kwargs):
super().__init__()
self.sink = sink
self.spn_client = kwargs.get('spn_client',
SavePageNowClient())
self.wayback_client = kwargs.get('wayback_client',
WaybackClient())
self.cdx_client = kwargs.get('cdx_client',
CdxApiClient())
self.grobid_client = kwargs.get('grobid_client',
GrobidClient())
def get_cdx_and_body(self, url):
"""
Returns a CDX dict and body as a tuple.
If there isn't an existing wayback capture, take one now. Raises an
exception if can't capture, or if CDX API not available.
Raises an exception if can't find/fetch.
TODO:
- doesn't handle redirects (at CDX layer). could allow 3xx status codes and follow recursively
"""
WAYBACK_ENDPOINT = "https://web.archive.org/web/"
cdx = self.cdx_client.lookup_latest(url, follow_redirects=True)
if not cdx:
# TODO: refactor this to make adding new domains/patterns easier
# sciencedirect.com (Elsevier) requires browser crawling (SPNv2)
if ('sciencedirect.com' in url and '.pdf' in url) or ('osapublishing.org' in url) or ('pubs.acs.org/doi/' in url) or ('ieeexplore.ieee.org' in url and ('.pdf' in url or '/stamp/stamp.jsp' in url)) or ('hrmars.com' in url):
#print(url)
cdx_list = self.spn_client.save_url_now_v2(url)
for cdx_url in cdx_list:
if 'pdf.sciencedirectassets.com' in cdx_url and '.pdf' in cdx_url:
cdx = self.cdx_client.lookup_latest(cdx_url)
break
if 'osapublishing.org' in cdx_url and 'abstract.cfm' in cdx_url:
cdx = self.cdx_client.lookup_latest(cdx_url)
break
if 'pubs.acs.org' in cdx_url and '/doi/pdf/' in cdx_url:
cdx = self.cdx_client.lookup_latest(cdx_url)
break
if 'ieeexplore.ieee.org' in cdx_url and '.pdf' in cdx_url and 'arnumber=' in cdx_url:
cdx = self.cdx_client.lookup_latest(cdx_url)
break
if 'hrmars.com' in cdx_url and 'journals/papers' in cdx_url:
cdx = self.cdx_client.lookup_latest(cdx_url)
break
if not cdx:
# extraction didn't work as expected; fetch whatever SPN2 got
cdx = self.cdx_client.lookup_latest(url, follow_redirects=True)
if not cdx:
sys.stderr.write("{}\n".format(cdx_list))
raise SavePageNowError("Failed to find terminal capture from SPNv2")
else:
return self.spn_client.save_url_now_v1(url)
try:
resp = requests.get(WAYBACK_ENDPOINT + cdx['datetime'] + "id_/" + cdx['url'])
except requests.exceptions.TooManyRedirects as e:
raise WaybackError("Redirect loop fetching from wayback (dt: {}, url: {})".format(cdx['datetime'], cdx['url']))
if resp.status_code != cdx['http_status']:
raise WaybackError("Got unexpected wayback status (expected {} from CDX, got {})".format(cdx['http_status'], resp.status_code))
body = resp.content
return (cdx, body)
def process(self, request):
"""
1. check sandcrawler-db for base_url
-> if found, populate terminal+wayback fields
2. check CDX for base_url (only 200, past year)
-> if found, populate terminal+wayback fields
3. if we have wayback, fetch that. otherwise do recursive SPN crawl
-> populate terminal+wayback
4. calculate file_meta
-> populate file_meta
5. check sandcrawler-db for GROBID XML
6. run GROBID if we didn't already
-> push results to minio+sandcrawler-db
7. decide if this was a hit
In all cases, print JSON status, and maybe push to sandcrawler-db
"""
response = dict(request=request, hit=False)
url = request['base_url']
while url:
try:
(cdx_dict, body) = self.get_cdx_and_body(url)
except SavePageNowRemoteError as e:
response['status'] = 'spn-remote-error'
response['error_message'] = str(e)
return response
except SavePageNowError as e:
response['status'] = 'spn-error'
response['error_message'] = str(e)
return response
except CdxApiError as e:
response['status'] = 'cdx-error'
response['error_message'] = str(e)
return response
except WaybackError as e:
response['status'] = 'wayback-error'
response['error_message'] = str(e)
return response
sys.stderr.write("CDX hit: {}\n".format(cdx_dict))
response['cdx'] = cdx_dict
# TODO: populate terminal
response['terminal'] = dict(url=cdx_dict['url'], http_status=cdx_dict['http_status'])
if not body:
response['status'] = 'null-body'
return response
if cdx_dict['http_status'] != 200:
response['status'] = 'terminal-bad-status'
return response
file_meta = gen_file_metadata(body)
mimetype = cdx_dict['mimetype']
if mimetype in ('warc/revisit', 'binary/octet-stream', 'application/octet-stream', 'application/x-download', 'application/force-download'):
mimetype = file_meta['mimetype']
response['file_meta'] = file_meta
if 'html' in mimetype:
page_metadata = extract_fulltext_url(response['cdx']['url'], body)
if page_metadata and page_metadata.get('pdf_url'):
next_url = page_metadata.get('pdf_url')
if next_url == url:
response['status'] = 'link-loop'
return response
url = next_url
continue
elif page_metadata and page_metadata.get('next_url'):
next_url = page_metadata.get('next_url')
if next_url == url:
response['status'] = 'link-loop'
return response
url = next_url
continue
else:
response['terminal']['html'] = page_metadata
response['status'] = 'no-pdf-link'
return response
elif 'pdf' in mimetype:
break
else:
response['status'] = 'other-mimetype'
return response
response['file_meta'] = file_meta
# if we got here, we have a PDF
sha1hex = response['file_meta']['sha1hex']
# do GROBID
response['grobid'] = self.grobid_client.process_fulltext(body)
#sys.stderr.write("GROBID status: {}\n".format(response['grobid']['status']))
# TODO: optionally publish to Kafka here, but continue on failure (but
# send a sentry exception?)
# parse metadata, but drop fulltext from ingest response
if response['grobid']['status'] == 'success':
grobid_metadata = self.grobid_client.metadata(response['grobid'])
if grobid_metadata:
response['grobid'].update(grobid_metadata)
response['grobid'].pop('tei_xml')
# Ok, now what?
#sys.stderr.write("GOT TO END\n")
response['status'] = "success"
response['hit'] = True
return response
class IngestFileRequestHandler(BaseHTTPRequestHandler):
def do_POST(self):
if self.path != "/ingest":
self.send_response(404)
self.end_headers()
self.wfile.write("404: Not Found")
return
length = int(self.headers.get('content-length'))
request = json.loads(self.rfile.read(length).decode('utf-8'))
print("Got request: {}".format(request))
ingester = IngestFileWorker()
result = ingester.process(request)
self.send_response(200)
self.end_headers()
self.wfile.write(json.dumps(result))
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