ArchiveBox/archivebox/extractors/readability.py
2022-02-09 10:48:51 +08:00

114 lines
3.5 KiB
Python

__package__ = 'archivebox.extractors'
from pathlib import Path
from tempfile import NamedTemporaryFile
from typing import Optional
import json
from ..index.schema import Link, ArchiveResult, ArchiveError
from ..system import run, atomic_write
from ..util import (
enforce_types,
is_static_file,
)
from ..config import (
TIMEOUT,
CURL_BINARY,
SAVE_READABILITY,
DEPENDENCIES,
READABILITY_VERSION,
)
from ..logging_util import TimedProgress
from .title import get_html
@enforce_types
def should_save_readability(link: Link, out_dir: Optional[str]=None, overwrite: Optional[bool]=False) -> bool:
if is_static_file(link.url):
return False
out_dir = out_dir or Path(link.link_dir)
if not overwrite and (out_dir / 'readability').exists():
return False
return SAVE_READABILITY
@enforce_types
def save_readability(link: Link, out_dir: Optional[str]=None, timeout: int=TIMEOUT) -> ArchiveResult:
"""download reader friendly version using @mozilla/readability"""
out_dir = Path(out_dir or link.link_dir)
output_folder = out_dir.absolute() / "readability"
output = "readability"
# Readability Docs: https://github.com/mozilla/readability
status = 'succeeded'
# fake command to show the user so they have something to try debugging if get_html fails
cmd = [
CURL_BINARY,
link.url
]
readability_content = None
timer = TimedProgress(timeout, prefix=' ')
try:
document = get_html(link, out_dir)
temp_doc = NamedTemporaryFile(delete=False)
temp_doc.write(document.encode("utf-8"))
temp_doc.close()
if not document or len(document) < 10:
raise ArchiveError('Readability could not find HTML to parse for article text')
cmd = [
DEPENDENCIES['READABILITY_BINARY']['path'],
temp_doc.name,
link.url,
]
result = run(cmd, cwd=out_dir, timeout=timeout)
try:
result_json = json.loads(result.stdout)
assert result_json and 'content' in result_json
except json.JSONDecodeError:
raise ArchiveError('Readability was not able to archive the page', result.stdout + result.stderr)
output_folder.mkdir(exist_ok=True)
readability_content = result_json.pop("textContent")
atomic_write(str(output_folder / "content.html"), result_json.pop("content"))
atomic_write(str(output_folder / "content.txt"), readability_content)
atomic_write(str(output_folder / "article.json"), result_json)
# parse out number of files downloaded from last line of stderr:
# "Downloaded: 76 files, 4.0M in 1.6s (2.52 MB/s)"
output_tail = [
line.strip()
for line in (result.stdout + result.stderr).decode().rsplit('\n', 3)[-3:]
if line.strip()
]
hints = (
'Got readability response code: {}.'.format(result.returncode),
*output_tail,
)
# Check for common failure cases
if (result.returncode > 0):
raise ArchiveError('Readability was not able to archive the page', hints)
except (Exception, OSError) as err:
status = 'failed'
output = err
cmd = [cmd[0], './{singlefile,dom}.html']
finally:
timer.end()
return ArchiveResult(
cmd=cmd,
pwd=str(out_dir),
cmd_version=READABILITY_VERSION,
output=output,
status=status,
index_texts=[readability_content] if readability_content else [],
**timer.stats,
)