mirror of https://github.com/zulip/zulip.git
63 lines
2.6 KiB
Python
63 lines
2.6 KiB
Python
import os
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from typing import Any, Iterator
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import ujson
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from django.core.management.base import BaseCommand, CommandParser
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from django.db.models import QuerySet
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from zerver.lib.message import render_markdown
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from zerver.models import Message
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def queryset_iterator(queryset: QuerySet, chunksize: int=5000) -> Iterator[Any]:
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queryset = queryset.order_by('id')
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while queryset.exists():
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for row in queryset[:chunksize]:
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msg_id = row.id
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yield row
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queryset = queryset.filter(id__gt=msg_id)
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class Command(BaseCommand):
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help = """
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Render messages to a file.
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Usage: ./manage.py render_messages <destination> [--amount=10000]
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"""
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def add_arguments(self, parser: CommandParser) -> None:
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parser.add_argument('destination', help='Destination file path')
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parser.add_argument('--amount', default=100000, help='Number of messages to render')
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parser.add_argument('--latest_id', default=0, help="Last message id to render")
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def handle(self, *args: Any, **options: Any) -> None:
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dest_dir = os.path.realpath(os.path.dirname(options['destination']))
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amount = int(options['amount'])
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latest = int(options['latest_id']) or Message.objects.latest('id').id
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self.stdout.write('Latest message id: {latest}'.format(latest=latest))
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if not os.path.exists(dest_dir):
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os.makedirs(dest_dir)
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with open(options['destination'], 'w') as result:
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result.write('[')
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messages = Message.objects.filter(id__gt=latest - amount, id__lte=latest).order_by('id')
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for message in queryset_iterator(messages):
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content = message.content
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# In order to ensure that the output of this tool is
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# consistent across the time, even if messages are
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# edited, we always render the original content
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# version, extracting it from the edit history if
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# necessary.
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if message.edit_history:
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history = ujson.loads(message.edit_history)
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history = sorted(history, key=lambda i: i['timestamp'])
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for entry in history:
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if 'prev_content' in entry:
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content = entry['prev_content']
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break
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result.write(ujson.dumps({
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'id': message.id,
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'content': render_markdown(message, content)
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}))
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if message.id != latest:
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result.write(',')
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result.write(']')
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