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server_count.py
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server_count.py
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import ujson as json
from sparkcc import CCSparkJob
class ServerCountJob(CCSparkJob):
""" Count server names sent in HTTP response header
(WARC and WAT is allowed as input)"""
name = "CountServers"
fallback_server_name = '(no server in HTTP header)'
def process_record(self, record):
# Notes:
# - HTTP headers may include multiple "Server" headers, often indicating
# a delivery cascade, e.g. nginx + idlb1 (load balancer).
# We iterate over all "Server" headers in WARC records, in order to count
# multiple (but unique) "Server" headers.
# - WAT records store HTTP headers as JSON objects not preserving multiple
# headers, see https://github.com/commoncrawl/ia-web-commons/issues/18
if self.is_wat_json_record(record):
# WAT (response) record
record = json.loads(self.get_payload_stream(record).read())
try:
payload = record['Envelope']['Payload-Metadata']
if 'HTTP-Response-Metadata' in payload:
try:
server_name = payload['HTTP-Response-Metadata'] \
['Headers'] \
['Server'] \
.strip()
if server_name and server_name != '':
yield server_name, 1
else:
yield ServerCountJob.fallback_server_name, 1
except KeyError:
yield ServerCountJob.fallback_server_name, 1
else:
# WAT request or metadata records
pass
except KeyError:
self.get_logger().warn("No payload metadata in WAT record for %s",
self.get_warc_header(record, 'WARC-Target-URI'))
elif self.is_response_record(record):
# WARC response record
server_names = set()
for (name, value) in self.get_http_headers(record):
if name.lower() == 'server':
if value == '':
pass
elif value in server_names:
self.get_logger().debug(
"Not counting duplicated 'Server' header value for %s: %s",
self.get_warc_header(record, 'WARC-Target-URI'))
else:
yield value, 1
server_names.add(value)
if not server_names:
yield ServerCountJob.fallback_server_name, 1
elif len(server_names) > 1:
self.get_logger().info(
"Multiple 'Server' header values for %s: %s",
self.get_warc_header(record, 'WARC-Target-URI'), server_names)
else:
# warcinfo, request, non-WAT metadata records
pass
if __name__ == "__main__":
job = ServerCountJob()
job.run()