88 lines
3.3 KiB
Python
88 lines
3.3 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import hashlib
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import logging
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import re
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import time
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import urllib.parse
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from collections.abc import Callable
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from typing import Optional
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import _hashlib
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import requests
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from praw.models import Submission
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from bdfr.exceptions import BulkDownloaderException
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logger = logging.getLogger(__name__)
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class Resource:
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def __init__(self, source_submission: Submission, url: str, download_function: Callable, extension: str = None):
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self.source_submission = source_submission
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self.content: Optional[bytes] = None
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self.url = url
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self.hash: Optional[_hashlib.HASH] = None
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self.extension = extension
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self.download_function = download_function
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if not self.extension:
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self.extension = self._determine_extension()
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@staticmethod
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def retry_download(url: str) -> Callable:
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return lambda global_params: Resource.http_download(url, global_params)
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def download(self, download_parameters: Optional[dict] = None):
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if download_parameters is None:
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download_parameters = {}
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if not self.content:
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try:
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content = self.download_function(download_parameters)
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except requests.exceptions.ConnectionError as e:
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raise BulkDownloaderException(f"Could not download resource: {e}")
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except BulkDownloaderException:
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raise
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if content:
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self.content = content
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if not self.hash and self.content:
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self.create_hash()
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def create_hash(self):
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self.hash = hashlib.md5(self.content)
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def _determine_extension(self) -> Optional[str]:
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extension_pattern = re.compile(r".*(\..{3,5})$")
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stripped_url = urllib.parse.urlsplit(self.url).path
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match = re.search(extension_pattern, stripped_url)
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if match:
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return match.group(1)
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@staticmethod
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def http_download(url: str, download_parameters: dict) -> Optional[bytes]:
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headers = download_parameters.get("headers")
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current_wait_time = 60
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if "max_wait_time" in download_parameters:
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max_wait_time = download_parameters["max_wait_time"]
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else:
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max_wait_time = 300
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while True:
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try:
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response = requests.get(url, headers=headers)
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if re.match(r"^2\d{2}", str(response.status_code)) and response.content:
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return response.content
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elif response.status_code in (408, 429):
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raise requests.exceptions.ConnectionError(f"Response code {response.status_code}")
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else:
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raise BulkDownloaderException(
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f"Unrecoverable error requesting resource: HTTP Code {response.status_code}"
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)
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except (requests.exceptions.ConnectionError, requests.exceptions.ChunkedEncodingError) as e:
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logger.warning(f"Error occured downloading from {url}, waiting {current_wait_time} seconds: {e}")
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time.sleep(current_wait_time)
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if current_wait_time < max_wait_time:
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current_wait_time += 60
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else:
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logger.error(f"Max wait time exceeded for resource at url {url}")
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raise
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