514 lines
18 KiB
Python
514 lines
18 KiB
Python
from __future__ import annotations
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import logging
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import random
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import re
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from collections import defaultdict
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from copy import copy
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from dataclasses import dataclass, field
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from pathlib import Path
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from string import Formatter
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from typing import (TYPE_CHECKING, Any, Callable, Dict, Generator, List,
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Optional, Set, Tuple, Type, TypedDict, Union)
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import requests
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from bs4 import BeautifulSoup
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from ..audio import correct_codec, write_metadata_to_target
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from ..connection import Connection
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from ..objects import Album, Artist, Collection
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from ..objects import DatabaseObject as DataObject
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from ..objects import Label, Options, Song, Source, Target
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from ..utils import BColors, limit_generator, output, trace
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from ..utils.config import main_settings, youtube_settings
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from ..utils.enums import ALL_SOURCE_TYPES, SourceType
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from ..utils.enums.album import AlbumType
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from ..utils.exception import MKComposeException, MKMissingNameException
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from ..utils.exception.download import UrlNotFoundException
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from ..utils.path_manager import LOCATIONS
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from ..utils.shared import DEBUG_PAGES
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from ..utils.string_processing import fit_to_file_system
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from ..utils.support_classes.download_result import DownloadResult
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from ..utils.support_classes.query import Query
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from .results import SearchResults
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@dataclass
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class FetchOptions:
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download_all: bool = False
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album_type_blacklist: Set[AlbumType] = field(default_factory=lambda: set(AlbumType(a) for a in main_settings["album_type_blacklist"]))
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@dataclass
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class DownloadOptions:
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download_all: bool = False
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album_type_blacklist: Set[AlbumType] = field(default_factory=lambda: set(AlbumType(a) for a in main_settings["album_type_blacklist"]))
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download_again_if_found: bool = False
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process_audio_if_found: bool = False
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process_metadata_if_found: bool = True
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fetch_map = {
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Song: "fetch_song",
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Album: "fetch_album",
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Artist: "fetch_artist",
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Label: "fetch_label",
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}
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class Downloader:
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def __init__(
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self,
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auto_register_pages: bool = True,
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download_options: DownloadOptions = None,
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fetch_options: FetchOptions = None,
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**kwargs
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):
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self.LOGGER = logging.getLogger("download")
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self.download_options: DownloadOptions = download_options or DownloadOptions()
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self.fetch_options: FetchOptions = fetch_options or FetchOptions()
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self._registered_pages: Dict[Type[Page], Set[Page]] = defaultdict(set)
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if auto_register_pages:
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self.scan_for_pages(**kwargs)
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# manage which pages to use
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def register_page(self, page_type: Type[Page], **kwargs):
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if page_type in self._registered_pages:
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return
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self._registered_pages[page_type].add(page_type(
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download_options=self.download_options,
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fetch_options=self.fetch_options,
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**kwargs
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))
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def deregister_page(self, page_type: Type[Page]):
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if page_type not in _registered_pages:
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return
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for p in self._registered_pages[page_type]:
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p.__del__()
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del self._registered_pages[page_type]
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def scan_for_pages(self, **kwargs):
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# assuming the wanted pages are the leaf classes of the interface
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from .. import pages
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leaf_classes = []
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class_list = [Page]
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while len(class_list):
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_class = class_list.pop()
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class_subclasses = _class.__subclasses__()
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if len(class_subclasses) == 0:
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if _class.REGISTER:
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leaf_classes.append(_class)
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else:
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class_list.extend(class_subclasses)
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if Page in leaf_classes:
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self.LOGGER.warn("couldn't find any data source")
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return
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for leaf_class in leaf_classes:
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self.register_page(leaf_class, **kwargs)
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def get_pages(self, *page_types: List[Type[Page]]) -> Generator[Page, None, None]:
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if len(page_types) == 0:
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page_types = self._registered_pages.keys()
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for page_type in page_types:
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yield from self._registered_pages[page_type]
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# fetching/downloading data
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def search(self, query: Query) -> Generator[DataObject, None, None]:
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"""Yields all data objects that were found by the query.
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Other than `Downloader.search_yield_pages`, this function just yields all data objects.
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This looses the data, where th objects were searched originally, so this might not be the best choice.
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Args:
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query (Query): The query to search for.
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Yields:
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Generator[DataObject, None, None]: A generator that yields all found data objects.
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"""
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for page in self.get_pages():
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yield from page.search(query=query)
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def search_yield_pages(self, query: Query, results_per_page: Optional[int] = None) -> Generator[Tuple[Page, Generator[DataObject, None, None]], None, None]:
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"""Yields all data objects that were found by the query, grouped by the page they were found on.
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every yield is a tuple of the page and a generator that yields the data objects.
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So this could be how it is used:
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```python
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for page, data_objects in downloader.search_yield_pages(query):
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print(f"Found on {page}:")
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for data_object in data_objects:
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print(data_object)
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```
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Args:
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query (Query): The query to search for.
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results_per_page (Optional[int], optional): If this is set, the generators only yield this amount of data objects per page.
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Yields:
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Generator[Tuple[Page, Generator[DataObject, None, None]], None, None]: yields the page and a generator that yields the data objects.
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"""
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for page in self.get_pages():
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yield page, limit_generator(page.search(query=query), limit=results_per_page)
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def fetch_details(self, data_object: DataObject, **kwargs) -> DataObject:
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"""Fetches more details for the given data object.
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This uses every source contained in data_object.source_collection that has a page.
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Args:
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data_object (DataObject): The data object to fetch details for.
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Returns:
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DataObject: The same data object, but with more details.
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"""
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source: Source
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for source in data_object.source_collection.get_sources(source_type_sorting={
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"only_with_page": True,
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}):
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new_data_object = self.fetch_from_source(source=source, **kwargs)
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if new_data_object is not None:
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data_object.merge(new_data_object)
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return data_object
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def fetch_from_source(self, source: Source, **kwargs) -> Optional[DataObject]:
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"""Gets a data object from the given source.
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Args:
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source (Source): The source to get the data object from.
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Returns:
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Optional[DataObject]: If a data object can be retrieved, it is returned. Otherwise, None is returned.
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"""
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if not source.has_page:
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return None
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source_type = source.page.get_source_type(source=source)
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if source_type is None:
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self.LOGGER.debug(f"Could not determine source type for {source}.")
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return None
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func = getattr(source.page, fetch_map[source_type])
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# fetching the data object and marking it as fetched
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data_object: DataObject = func(source=source, **kwargs)
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data_object.mark_as_fetched(source.hash_url)
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return data_object
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def fetch_from_url(self, url: str) -> Optional[DataObject]:
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"""This function tries to detect the source of the given url and fetches the data object from it.
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Args:
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url (str): The url to fetch the data object from.
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Returns:
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Optional[DataObject]: The fetched data object, or None if no source could be detected or if no object could be retrieved.
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"""
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source = Source.match_url(url, ALL_SOURCE_TYPES.MANUAL)
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if source is None:
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return None
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return self.fetch_from_source(source=source)
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def _skip_object(self, data_object: DataObject) -> bool:
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if isinstance(data_object, Album):
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if not self.download_options.download_all and data_object.album_type in self.download_options.album_type_blacklist:
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return True
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return False
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def download(self, data_object: DataObject, genre: str, **kwargs) -> DownloadResult:
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# fetch the given object
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self.fetch_details(data_object)
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output(f"\nDownloading {data_object.option_string}...", color=BColors.BOLD)
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# fetching all parent objects (e.g. if you only download a song)
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if not kwargs.get("fetched_upwards", False):
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to_fetch: List[DataObject] = [data_object]
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while len(to_fetch) > 0:
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new_to_fetch = []
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for d in to_fetch:
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if self._skip_object(d):
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continue
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self.fetch_details(d)
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for c in d.get_parent_collections():
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new_to_fetch.extend(c)
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to_fetch = new_to_fetch
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kwargs["fetched_upwards"] = True
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# download all children
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download_result: DownloadResult = DownloadResult()
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for c in data_object.get_child_collections():
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for d in c:
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if self._skip_object(d):
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continue
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download_result.merge(self.download(d, genre, **kwargs))
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# actually download if the object is a song
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if isinstance(data_object, Song):
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"""
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TODO
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add the traced artist and album to the naming.
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I am able to do that, because duplicate values are removed later on.
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"""
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self._download_song(data_object, naming={
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"genre": [genre],
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"audio_format": [main_settings["audio_format"]],
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})
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return download_result
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def _extract_fields_from_template(self, path_template: str) -> Set[str]:
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return set(re.findall(r"{([^}]+)}", path_template))
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def _parse_path_template(self, path_template: str, naming: Dict[str, List[str]]) -> str:
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field_names: Set[str] = self._extract_fields_from_template(path_template)
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for field in field_names:
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if len(naming[field]) == 0:
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raise MKMissingNameException(f"Missing field for {field}.")
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path_template = path_template.replace(f"{{{field}}}", naming[field][0])
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return path_template
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def _download_song(self, song: Song, naming: dict) -> DownloadOptions:
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"""
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TODO
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Search the song in the file system.
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"""
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r = DownloadResult(total=1)
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# pre process the data recursively
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song.compile()
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# manage the naming
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naming: Dict[str, List[str]] = defaultdict(list, naming)
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naming["song"].append(song.title_value)
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naming["isrc"].append(song.isrc)
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naming["album"].extend(a.title_value for a in song.album_collection)
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naming["album_type"].extend(a.album_type.value for a in song.album_collection)
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naming["artist"].extend(a.name for a in song.artist_collection)
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naming["artist"].extend(a.name for a in song.feature_artist_collection)
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for a in song.album_collection:
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naming["label"].extend([l.title_value for l in a.label_collection])
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# removing duplicates from the naming, and process the strings
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for key, value in naming.items():
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# https://stackoverflow.com/a/17016257
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naming[key] = list(dict.fromkeys(value))
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song.genre = naming["genre"][0]
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# manage the targets
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tmp: Target = Target.temp(file_extension=main_settings["audio_format"])
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song.target_collection.append(Target(
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relative_to_music_dir=True,
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file_path=Path(
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self._parse_path_template(main_settings["download_path"], naming=naming),
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self._parse_path_template(main_settings["download_file"], naming=naming),
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)
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))
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for target in song.target_collection:
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if target.exists:
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output(f'{target.file_path} {BColors.OKGREEN.value}[already exists]', color=BColors.GREY)
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r.found_on_disk += 1
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if not self.download_options.download_again_if_found:
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target.copy_content(tmp)
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else:
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target.create_path()
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output(f'{target.file_path}', color=BColors.GREY)
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# this streams from every available source until something succeeds, setting the skip intervals to the values of the according source
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used_source: Optional[Source] = None
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skip_intervals: List[Tuple[float, float]] = []
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for source in song.source_collection.get_sources(source_type_sorting={
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"only_with_page": True,
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"sort_key": lambda page: page.download_priority,
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"reverse": True,
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}):
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if tmp.exists:
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break
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used_source = source
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streaming_results = source.page.download_song_to_target(source=source, target=tmp, desc="download")
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skip_intervals = source.page.get_skip_intervals(song=song, source=source)
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# if something has been downloaded but it somehow failed, delete the file
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if streaming_results.is_fatal_error and tmp.exists:
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tmp.delete()
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# if everything went right, the file should exist now
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if not tmp.exists:
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if used_source is None:
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r.error_message = f"No source found for {song.option_string}."
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else:
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r.error_message = f"Something went wrong downloading {song.option_string}."
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return r
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# post process the audio
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found_on_disk = used_source is None
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if not found_on_disk or self.download_options.process_audio_if_found:
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correct_codec(target=tmp, skip_intervals=skip_intervals)
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r.sponsor_segments = len(skip_intervals)
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if used_source is not None:
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used_source.page.post_process_hook(song=song, temp_target=tmp)
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if not found_on_disk or self.download_options.process_metadata_if_found:
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write_metadata_to_target(metadata=song.metadata, target=tmp, song=song)
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# copy the tmp target to the final locations
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for target in song.target_collection:
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tmp.copy_content(target)
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tmp.delete()
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return r
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def fetch_url(self, url: str, **kwargs) -> DataObject:
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source = Source.match_url(url, ALL_SOURCE_TYPES.MANUAL)
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if source is None or source.page is None:
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raise UrlNotFoundException(url=url)
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return source.page.fetch_object_from_source(source=source, **kwargs)
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class Page:
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REGISTER = True
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SOURCE_TYPE: SourceType
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LOGGER: logging.Logger
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def __new__(cls, *args, **kwargs):
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cls.LOGGER = logging.getLogger(cls.__name__)
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return super().__new__(cls)
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@classmethod
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def is_leaf_page(cls) -> bool:
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return len(cls.__subclasses__()) == 0
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def __init__(self, download_options: DownloadOptions = None, fetch_options: FetchOptions = None, **kwargs):
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self.SOURCE_TYPE.register_page(self)
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self.download_options: DownloadOptions = download_options or DownloadOptions()
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self.fetch_options: FetchOptions = fetch_options or FetchOptions()
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def __del__(self):
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self.SOURCE_TYPE.deregister_page()
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def _search_regex(self, pattern, string, default=None, fatal=True, flags=0, group=None):
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"""
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Perform a regex search on the given string, using a single or a list of
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patterns returning the first matching group.
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In case of failure return a default value or raise a WARNING or a
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RegexNotFoundError, depending on fatal, specifying the field name.
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"""
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if isinstance(pattern, str):
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mobj = re.search(pattern, string, flags)
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else:
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for p in pattern:
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mobj = re.search(p, string, flags)
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if mobj:
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break
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if mobj:
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if group is None:
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# return the first matching group
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return next(g for g in mobj.groups() if g is not None)
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elif isinstance(group, (list, tuple)):
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return tuple(mobj.group(g) for g in group)
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else:
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return mobj.group(group)
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return default
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def get_source_type(self, source: Source) -> Optional[Type[DataObject]]:
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return None
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def get_soup_from_response(self, r: requests.Response) -> BeautifulSoup:
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return BeautifulSoup(r.content, "html.parser")
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# to search stuff
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def search(self, query: Query) -> List[DataObject]:
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music_object = query.music_object
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search_functions = {
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Song: self.song_search,
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Album: self.album_search,
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Artist: self.artist_search,
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Label: self.label_search
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}
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if type(music_object) in search_functions:
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r = search_functions[type(music_object)](music_object)
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if r is not None and len(r) > 0:
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return r
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r = []
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for default_query in query.default_search:
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for single_option in self.general_search(default_query):
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r.append(single_option)
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return r
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def general_search(self, search_query: str) -> List[DataObject]:
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return []
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def label_search(self, label: Label) -> List[Label]:
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return []
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def artist_search(self, artist: Artist) -> List[Artist]:
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return []
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def album_search(self, album: Album) -> List[Album]:
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return []
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def song_search(self, song: Song) -> List[Song]:
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return []
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# to fetch stuff
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def fetch_song(self, source: Source, stop_at_level: int = 1) -> Song:
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return Song()
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def fetch_album(self, source: Source, stop_at_level: int = 1) -> Album:
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return Album()
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def fetch_artist(self, source: Source, stop_at_level: int = 1) -> Artist:
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return Artist()
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def fetch_label(self, source: Source, stop_at_level: int = 1) -> Label:
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return Label()
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# to download stuff
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def get_skip_intervals(self, song: Song, source: Source) -> List[Tuple[float, float]]:
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return []
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def post_process_hook(self, song: Song, temp_target: Target, **kwargs):
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pass
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def download_song_to_target(self, source: Source, target: Target, desc: str = None) -> DownloadResult:
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return DownloadResult()
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