forked from webrecorder/warcio
/
warcwriter.py
161 lines (116 loc) · 5.19 KB
/
warcwriter.py
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import zlib
from socket import gethostname
from warcio.utils import Digester
from warcio.recordbuilder import RecordBuilder
from warcio.statusandheaders import StatusAndHeadersParser
# ============================================================================
class BaseWARCWriter(RecordBuilder):
def __init__(self, gzip=True, *args, **kwargs):
super(BaseWARCWriter, self).__init__(warc_version=kwargs.get('warc_version'),
header_filter=kwargs.get('header_filter'))
self.gzip = gzip
self.hostname = gethostname()
self.parser = StatusAndHeadersParser([], verify=False)
def write_request_response_pair(self, req, resp, params=None):
url = resp.rec_headers.get_header('WARC-Target-URI')
dt = resp.rec_headers.get_header('WARC-Date')
req.rec_headers.replace_header('WARC-Target-URI', url)
req.rec_headers.replace_header('WARC-Date', dt)
resp_id = resp.rec_headers.get_header('WARC-Record-ID')
if resp_id:
req.rec_headers.add_header('WARC-Concurrent-To', resp_id)
self._do_write_req_resp(req, resp, params)
def write_record(self, record, params=None): #pragma: no cover
raise NotImplemented()
def _do_write_req_resp(self, req, resp, params): #pragma: no cover
raise NotImplemented()
def _write_warc_record(self, out, record):
if self.gzip:
out = GzippingWrapper(out)
if record.http_headers:
record.http_headers.compute_headers_buffer(self.header_filter)
# Content-Length is None/unknown
# Fix record by: buffering and recomputing all digests and length
# (since no length, can't trust existing digests)
# Also remove content-type for consistent header ordering
if record.length is None:
record.rec_headers.remove_header('WARC-Block-Digest')
if record.rec_type != 'revisit':
record.rec_headers.remove_header('WARC-Payload-Digest')
record.rec_headers.remove_header('Content-Type')
self.ensure_digest(record, block=True, payload=True)
record.length = record.payload_length
# ensure digests are set
else:
self.ensure_digest(record, block=True, payload=True)
if record.content_type != None:
# ensure proper content type
record.rec_headers.replace_header('Content-Type', record.content_type)
if record.rec_type == 'revisit':
http_headers_only = True
else:
http_headers_only = False
# compute Content-Length
if record.http_headers and record.payload_length >= 0:
actual_len = 0
if record.http_headers:
actual_len = len(record.http_headers.headers_buff)
if not http_headers_only:
actual_len += record.payload_length
record.length = actual_len
record.rec_headers.replace_header('Content-Length', str(record.length))
# write record headers -- encoded as utf-8
# WARC headers can be utf-8 per spec
out.write(record.rec_headers.to_bytes(encoding='utf-8'))
# write headers buffer, if any
if record.http_headers:
out.write(record.http_headers.headers_buff)
if not http_headers_only:
try:
for buf in self._iter_stream(record.raw_stream):
out.write(buf)
finally:
if hasattr(record, '_orig_stream'):
record.raw_stream.close()
record.raw_stream = record._orig_stream
# add two lines
out.write(b'\r\n\r\n')
out.flush()
# ============================================================================
class GzippingWrapper(object):
def __init__(self, out):
self.compressor = zlib.compressobj(9, zlib.DEFLATED, zlib.MAX_WBITS + 16)
self.out = out
def write(self, buff):
#if isinstance(buff, str):
# buff = buff.encode('utf-8')
buff = self.compressor.compress(buff)
self.out.write(buff)
def flush(self):
buff = self.compressor.flush()
self.out.write(buff)
self.out.flush()
# ============================================================================
class WARCWriter(BaseWARCWriter):
def __init__(self, filebuf, *args, **kwargs):
super(WARCWriter, self).__init__(*args, **kwargs)
self.out = filebuf
def write_record(self, record, params=None):
self._write_warc_record(self.out, record)
def _do_write_req_resp(self, req, resp, params):
self._write_warc_record(self.out, resp)
self._write_warc_record(self.out, req)
# ============================================================================
class BufferWARCWriter(WARCWriter):
def __init__(self, *args, **kwargs):
out = self._create_temp_file()
super(BufferWARCWriter, self).__init__(out, *args, **kwargs)
def get_contents(self):
pos = self.out.tell()
self.out.seek(0)
buff = self.out.read()
self.out.seek(pos)
return buff
def get_stream(self):
self.out.seek(0)
return self.out