Warctools

WARC (Web ARChive) file tools for python 2/3 based on the WARC 1.0 spec and compatible with the Internet Archive's ARC File Format originally developed by Hanzo Archives.

Install

pip install warctools

Python Usage

from hanzo import warctools

Python Examples

Write a WARC file:

import os

from hanzo import warctools


def write():
    headers = [
        (b'WARC-Type', b'warcinfo'),
        (b'WARC-Date', b'2019-11-19T23:08:51.182451Z'),
        (b'WARC-Filename', b'CRAWL-20191119230851-00000-hostname.warc.gz'),
        (b'WARC-Record-ID', b'<urn:uuid:8cc5dcae-0b21-11ea-842b-525476278032>')
    ]
    content_type = b'application/warc-fields'
    content = 'This\nis\nonly\na\ntest\n'.encode()
    fname = 'test.warc.gz'

    mode = 'ab'
    if not os.path.exists(fname):
        mode = 'wb'

    with open(fname, mode) as _fh:
        content = (content_type, content)
        record = warctools.WarcRecord(headers=headers, content=content)
        record.write_to(_fh, gzip="record")

Command-line Usage

warcvalid

Returns 0 if the arguments are all valid W/ARC files, non-zero on error.

[warctools] $ warcvalid -h
Usage: warcvalid [options] warc warc warc

Options:
  -h, --help            show this help message and exit
  -l LIMIT, --limit=LIMIT
  -I INPUT_FORMAT, --input=INPUT_FORMAT
  -L LOG_LEVEL, --log-level=LOG_LEVEL

warcdump

Writes human readable summary of warcfiles. Autodetects input format when filenames are passed, i.e recordgzip vs plaintext, WARC vs ARC. Assumes uncompressed warc on stdin if no args.

[warctools] $ warcdump -h
Usage: warcdump [options] warc warc warc

Options:
  -h, --help            show this help message and exit
  -l LIMIT, --limit=LIMIT
  -I INPUT_FORMAT, --input=INPUT_FORMAT
  -L LOG_LEVEL, --log-level=LOG_LEVEL

warcfilter

Searches all headers for regex pattern. Autodetects and stdin like warcdump. Prints out a WARC format by default. Use -i to invert search. Use -U to constrain to url. Use -T to constrain to record type. Use -C to constrain to content-type.

$ warcfilter -h
Usage: warcfilter [options] pattern warc warc warc

Options:
  -h, --help            show this help message and exit
  -l LIMIT, --limit=LIMIT
                        limit (ignored)
  -I INPUT_FORMAT, --input=INPUT_FORMAT
                        input format (ignored)
  -i, --invert          invert match
  -U, --url             match on url
  -T, --type            match on (warc) record type
  -C, --content-type    match on (warc) record content type
  -H, --http-content-type
                        match on http payload content type
  -D, --warc-date       match on WARC-Date header
  -L LOG_LEVEL, --log-level=LOG_LEVEL
                        log level(ignored)

warc2warc

Autodetects compression on file args. Assumes uncompressed stdin if none. Use -Z to write compressed output, i.e warc2warc -Z input > input.gz. Should ignore buggy records in input.

[warctools] $ warc2warc -h
Usage: warc2warc [options] url (url ...)

Options:
  -h, --help            show this help message and exit
  -o OUTPUT, --output=OUTPUT
                        output warc file
  -l LIMIT, --limit=LIMIT
  -I INPUT_FORMAT, --input=INPUT_FORMAT
                        (ignored)
  -Z, --gzip            compress output, record by record
  -D, --decode_http     decode http messages (strip chunks, gzip)
  -L LOG_LEVEL, --log-level=LOG_LEVEL
  --wget-chunk-fix      skip transfer-encoding headers in http records, when
                        decoding them (-D)

arc2warc

Creates a crappy WARC file from arc files on input. A handful of headers are preserved. Use -Z to write compressed output, i.e arc2warc -Z input.arc > input.warc.gz

[warctools] $ arc2warc -h
Usage: arc2warc [options] arc (arc ...)

Options:
  -h, --help            show this help message and exit
  -o OUTPUT, --output=OUTPUT
                        output warc file
  -l LIMIT, --limit=LIMIT
  -Z, --gzip            compress
  -L LOG_LEVEL, --log-level=LOG_LEVEL
  --description=DESCRIPTION
  --operator=OPERATOR
  --publisher=PUBLISHER
  --audience=AUDIENCE
  --resource=RESOURCE
  --response=RESPONSE

warcindex

DEPRECATED, use CDX-writer branch.

#WARC-filename offset warc-type warc-subject-uri warc-record-id content-type content-length
warccrap/mywarc.warc 1196018 request /images/slides/hanzo_markm__wwwoh.pdf <urn:uuid:fd1255a8-d07c-11df-b125-12313b0a18c6> application/http;msgtype=request 193
warccrap/mywarc.warc 1196631 response http://www.hanzoarchives.com/images/slides/hanzo_markm__wwwoh.pdf <urn:uuid:fd2614f8-d07c-11df-b125-12313b0a18c6> application/http;msgtype=response 3279474

Notes

1. arc2warc uses the conversion rules from the earlier arc2warc.c as a starter for converting the headers
2. I haven't profiled the code yet (and don't plan to until it falls over)
3. Warcvalid barely skirts some of the iso standard, missing things:
   • strict whitespace
   • required headers check
   • mime quoted printable header encoding
   • treating headers as utf8

ToDo

1. Lots more testing
2. Support pre-1.0 WARC files
3. Add more documentation
4. Support more commandline options for output and filenames
5. S3 urls

Credits

Originally developed by "tef" thomas.figg@hanzoarchives.com.

@internetarchive