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[paperdoorknob] / fetch.py

# paperdoorknob: Print glowfic
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, version 3.


from abc import ABC, abstractmethod
from contextlib import contextmanager
from typing import Iterator

import requests
import requests_cache


class Fetcher(ABC):
    @abstractmethod
    def fetch(self, url: str) -> bytes:
        raise NotImplementedError()


class _SessionFetcher(Fetcher):

    def __init__(self, session: requests.Session, timeout: int) -> None:
        self._session = session
        self._timeout = timeout

    def fetch(self, url: str) -> bytes:
        with self._session.get(url, timeout=self._timeout) as r:
            r.raise_for_status()
            return r.content


@contextmanager
def DirectFetcher(timeout: int) -> Iterator[_SessionFetcher]:
    with requests.session() as session:
        yield _SessionFetcher(session, timeout)


@contextmanager
def CachingFetcher(cache_path: str, timeout: int) -> Iterator[_SessionFetcher]:
    with requests_cache.CachedSession(cache_path, cache_control=True) as session:
        yield _SessionFetcher(session, timeout)


class FakeFetcher(Fetcher):

    def __init__(self, resources: dict[str, bytes]) -> None:
        self._resources = resources
        self._fetch_count = 0

    def fetch(self, url: str) -> bytes:
        self._fetch_count += 1
        if url not in self._resources:
            raise requests.HTTPError("URL not found")
        return self._resources[url]

    def request_count(self) -> int:
        return self._fetch_count