mirror of
https://github.com/Garmelon/PFERD.git
synced 2023-12-21 10:23:01 +01:00
118 lines
3.6 KiB
Python
118 lines
3.6 KiB
Python
import asyncio
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import datetime
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import random
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from pathlib import Path, PurePath
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from typing import Optional
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from ..config import Config
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from ..crawler import Crawler, CrawlerSection, anoncritical
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class LocalCrawlerSection(CrawlerSection):
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def target(self) -> Path:
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value = self.s.get("target")
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if value is None:
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self.missing_value("target")
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return Path(value).expanduser()
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def crawl_delay(self) -> float:
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value = self.s.getfloat("crawl_delay", fallback=0.0)
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if value < 0:
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self.invalid_value("crawl_delay", value,
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"Must not be negative")
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return value
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def download_delay(self) -> float:
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value = self.s.getfloat("download_delay", fallback=0.0)
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if value < 0:
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self.invalid_value("download_delay", value,
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"Must not be negative")
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return value
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def download_speed(self) -> Optional[int]:
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value = self.s.getint("download_speed")
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if value is not None and value <= 0:
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self.invalid_value("download_speed", value,
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"Must be greater than 0")
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return value
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class LocalCrawler(Crawler):
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def __init__(
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self,
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name: str,
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section: LocalCrawlerSection,
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config: Config,
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):
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super().__init__(name, section, config)
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self._target = config.default_section.working_dir() / section.target()
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self._crawl_delay = section.crawl_delay()
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self._download_delay = section.download_delay()
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self._download_speed = section.download_speed()
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if self._download_speed:
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self._block_size = self._download_speed // 10
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else:
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self._block_size = 1024**2 # 1 MiB
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async def _run(self) -> None:
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await self._crawl_path(self._target, PurePath())
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@anoncritical
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async def _crawl_path(self, path: Path, pure: PurePath) -> None:
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if path.is_dir():
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await self._crawl_dir(path, pure)
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elif path.is_file():
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await self._crawl_file(path, pure)
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async def _crawl_dir(self, path: Path, pure: PurePath) -> None:
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cl = await self.crawl(pure)
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if not cl:
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return
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tasks = []
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async with cl:
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await asyncio.sleep(random.uniform(
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0.5 * self._crawl_delay,
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self._crawl_delay,
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))
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for child in path.iterdir():
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pure_child = pure / child.name
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tasks.append(self._crawl_path(child, pure_child))
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await self.gather(tasks)
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async def _crawl_file(self, path: Path, pure: PurePath) -> None:
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stat = path.stat()
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mtime = datetime.datetime.fromtimestamp(stat.st_mtime)
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dl = await self.download(pure, mtime=mtime)
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if not dl:
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return
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async with dl as (bar, sink):
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await asyncio.sleep(random.uniform(
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0.5 * self._download_delay,
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self._download_delay,
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))
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bar.set_total(stat.st_size)
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with open(path, "rb") as f:
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while True:
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data = f.read(self._block_size)
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if len(data) == 0:
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break
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sink.file.write(data)
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bar.advance(len(data))
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if self._download_speed:
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delay = self._block_size / self._download_speed
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delay = random.uniform(0.8 * delay, 1.2 * delay)
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await asyncio.sleep(delay)
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sink.done()
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