110 lines
3.1 KiB
Python
110 lines
3.1 KiB
Python
__package__ = 'archivebox.extractors'
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from pathlib import Path
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from subprocess import CompletedProcess
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from typing import Optional, List
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import json
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from django.db.models import Model
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from ..index.schema import ArchiveResult, ArchiveError
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from ..system import run, atomic_write
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from ..util import (
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enforce_types,
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is_static_file,
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)
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from ..config import (
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TIMEOUT,
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SAVE_MERCURY,
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DEPENDENCIES,
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MERCURY_VERSION,
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)
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from ..logging_util import TimedProgress
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@enforce_types
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def ShellError(cmd: List[str], result: CompletedProcess, lines: int=20) -> ArchiveError:
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# parse out last line of stderr
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return ArchiveError(
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f'Got {cmd[0]} response code: {result.returncode}).',
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" ".join(
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line.strip()
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for line in (result.stdout + result.stderr).decode().rsplit('\n', lines)[-lines:]
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if line.strip()
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),
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)
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@enforce_types
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def should_save_mercury(snapshot: Model, overwrite: Optional[bool]=False, out_dir: Optional[str]=None) -> bool:
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out_dir = out_dir or snapshot.snapshot_dir
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if is_static_file(snapshot.url):
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return False
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output = Path(out_dir or snapshot.snapshot_dir) / 'mercury'
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if not overwrite and output.exists():
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return False
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return SAVE_MERCURY and MERCURY_VERSION
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@enforce_types
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def save_mercury(snapshot: Model, out_dir: Optional[Path]=None, timeout: int=TIMEOUT) -> ArchiveResult:
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"""download reader friendly version using @postlight/mercury-parser"""
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out_dir = Path(out_dir or snapshot.snapshot_dir)
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output_folder = out_dir.absolute() / "mercury"
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output = str(output_folder)
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status = 'succeeded'
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timer = TimedProgress(timeout, prefix=' ')
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try:
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# Get plain text version of article
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cmd = [
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DEPENDENCIES['MERCURY_BINARY']['path'],
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snapshot.url,
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"--format=text"
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]
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result = run(cmd, cwd=out_dir, timeout=timeout)
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try:
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article_text = json.loads(result.stdout)
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except json.JSONDecodeError:
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raise ShellError(cmd, result)
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# Get HTML version of article
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cmd = [
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DEPENDENCIES['MERCURY_BINARY']['path'],
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snapshot.url
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]
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result = run(cmd, cwd=out_dir, timeout=timeout)
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try:
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article_json = json.loads(result.stdout)
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except json.JSONDecodeError:
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raise ShellError(cmd, result)
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output_folder.mkdir(exist_ok=True)
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atomic_write(str(output_folder / "content.html"), article_json.pop("content"))
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atomic_write(str(output_folder / "content.txt"), article_text["content"])
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atomic_write(str(output_folder / "article.json"), article_json)
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# Check for common failure cases
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if (result.returncode > 0):
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raise ShellError(cmd, result)
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except (ArchiveError, Exception, OSError) as err:
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status = 'failed'
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output = err
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finally:
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timer.end()
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return ArchiveResult(
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cmd=cmd,
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pwd=str(out_dir),
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cmd_version=MERCURY_VERSION,
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output=output,
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status=status,
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**timer.stats,
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)
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