60 lines
2.0 KiB
Python
60 lines
2.0 KiB
Python
import os
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from typing import List, Tuple, Union
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import aiohttp
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from app.repo import Repo
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class BaseScraper(Repo):
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def __init__(self, site: str, session: aiohttp.ClientSession):
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"""Initialize a new web scraper.
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@param site:
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The site we are making requests out to.
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@param session:
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The `aiohttp.ClientSession` context our requests are made from.
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"""
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super().__init__(site)
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self.session = session
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async def download_usernames(self) -> List[str]:
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"""Collect all coach usernames from the specified site."""
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raise NotImplementedError()
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async def download_profile(self, username: str):
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"""For each coach, download coach-specific data."""
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raise NotImplementedError()
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async def request(self, url: str) -> Tuple[Union[str, None], int]:
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"""Make network requests using the internal session.
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@param url
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The URL to make a GET request to.
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@return
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Tuple containing the response body (if the request was successful)
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and status code.
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"""
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async with self.session.get(url) as response:
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if response.status == 200:
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return await response.text(), 200
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return None, response.status
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async def scrape(self) -> List[str]:
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"""Main entrypoint for scraping and exporting downloaded content.
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A `Scraper` is structured to operates in the following stages:
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1. Collect all coach usernames from the specified site.
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2. For each coach, download coach-specific data.
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3. Transform this data and export into uniform format.
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"""
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os.makedirs(self.path_coaches_dir(), exist_ok=True)
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os.makedirs(self.path_pages_dir(), exist_ok=True)
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usernames = await self.download_usernames()
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for username in usernames:
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os.makedirs(self.path_coach_dir(username), exist_ok=True)
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await self.download_profile(username)
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return usernames
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