pferd/PFERD/crawl/local_crawler.py
Joscha bce3dc384d Deduplicate path names in crawler
Also rename files so they follow the restrictions for windows file names if
we're on windows.
2021-05-25 12:11:15 +02:00

118 lines
3.6 KiB
Python

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