311 lines
10 KiB
Python
311 lines
10 KiB
Python
"""
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Site and SiteManager
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Site should inherite from AbstractSite
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a Site should map to a unique set of url patterns.
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a Site may scrape a url and store result in ResourceContent
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ResourceContent persists as an ExternalResource which may link to an Item
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"""
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from typing import Callable
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import re
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from .models import ExternalResource, IdType, Item
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from dataclasses import dataclass, field
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import logging
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import json
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import django_rq
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_logger = logging.getLogger(__name__)
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@dataclass
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class ResourceContent:
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lookup_ids: dict = field(default_factory=dict)
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metadata: dict = field(default_factory=dict)
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cover_image: bytes | None = None
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cover_image_extention: str | None = None
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def dict(self):
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return {"metadata": self.metadata, "lookup_ids": self.lookup_ids}
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def to_json(self) -> str:
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return json.dumps({"metadata": self.metadata, "lookup_ids": self.lookup_ids})
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class AbstractSite:
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"""
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Abstract class to represent a site
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"""
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SITE_NAME = None
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ID_TYPE = None
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WIKI_PROPERTY_ID = "P0undefined0"
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DEFAULT_MODEL = None
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URL_PATTERNS = [r"\w+://undefined/(\d+)"]
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@classmethod
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def validate_url(cls, url: str):
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u = next(
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iter([re.match(p, url) for p in cls.URL_PATTERNS if re.match(p, url)]),
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None,
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)
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return u is not None
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@classmethod
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def validate_url_fallback(cls, url: str):
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return False
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@classmethod
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def id_to_url(cls, id_value):
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return "https://undefined/" + id_value
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@classmethod
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def url_to_id(cls, url: str):
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u = next(
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iter([re.match(p, url) for p in cls.URL_PATTERNS if re.match(p, url)]),
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None,
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)
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return u[1] if u else None
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def __str__(self):
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return f"<{self.__class__.__name__}: {self.url}>"
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def __init__(self, url=None, id_value=None):
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# use id if possible, url will be cleaned up by id_to_url()
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self.id_value = id_value or (self.url_to_id(url) if url else None)
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self.url = self.id_to_url(self.id_value) if self.id_value else None
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self.resource = None
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def get_resource(self) -> ExternalResource:
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if not self.resource:
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self.resource = ExternalResource.objects.filter(url=self.url).first()
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if self.resource is None:
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self.resource = ExternalResource.objects.filter(
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id_type=self.ID_TYPE, id_value=self.id_value
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).first()
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if self.resource is None:
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self.resource = ExternalResource(
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id_type=self.ID_TYPE, id_value=self.id_value, url=self.url
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)
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return self.resource
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def scrape(self) -> ResourceContent:
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"""subclass should implement this, return ResourceContent object"""
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data = ResourceContent()
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return data
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def scrape_additional_data(self):
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pass
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@classmethod
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def get_model_for_resource(cls, resource):
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model = resource.get_preferred_model()
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return model or cls.DEFAULT_MODEL
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@classmethod
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def match_existing_item_for_resource(cls, resource) -> Item | None:
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model = cls.get_model_for_resource(resource)
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if not model:
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return None
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t, v = model.get_best_lookup_id(resource.get_all_lookup_ids())
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matched = None
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if t is not None:
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matched = model.objects.filter(
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primary_lookup_id_type=t,
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primary_lookup_id_value=v,
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title=resource.metadata["title"],
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).first()
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if matched is None and resource.id_type not in [
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IdType.DoubanMusic, # DoubanMusic has many dirty data with same UPC
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# IdType.Goodreads, # previous scraper generated some dirty data
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]:
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matched = model.objects.filter(
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primary_lookup_id_type=t, primary_lookup_id_value=v
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).first()
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return matched
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@classmethod
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def match_or_create_item_for_resource(cls, resource):
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previous_item = resource.item
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resource.item = cls.match_existing_item_for_resource(resource)
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if resource.item is None:
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model = cls.get_model_for_resource(resource)
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if not model:
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return None
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t, v = model.get_best_lookup_id(resource.get_all_lookup_ids())
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obj = model.copy_metadata(resource.metadata)
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obj["primary_lookup_id_type"] = t
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obj["primary_lookup_id_value"] = v
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resource.item = model.objects.create(**obj)
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if previous_item != resource.item:
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resource.save(update_fields=["item"])
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return resource.item
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def get_item(self):
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p = self.get_resource()
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if not p:
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# raise ValueError(f'resource not available for {self.url}')
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return None
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if not p.ready:
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# raise ValueError(f'resource not ready for {self.url}')
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return None
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last_item = p.item
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item = self.match_or_create_item_for_resource(p)
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if last_item != p.item:
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p.save()
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return item
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@property
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def ready(self):
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return bool(self.resource and self.resource.ready)
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def get_resource_ready(
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self,
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auto_save=True,
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auto_create=True,
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auto_link=True,
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preloaded_content=None,
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ignore_existing_content=False,
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) -> ExternalResource | None:
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"""
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Returns an ExternalResource in scraped state if possible
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Parameters
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----------
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auto_save : bool
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automatically saves the ExternalResource and, if auto_create, the Item too
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auto_create : bool
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automatically creates an Item if not exist yet
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auto_link : bool
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automatically scrape the linked resources (e.g. a TVSeason may have a linked TVShow)
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preloaded_content : ResourceContent or dict
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skip scrape(), and use this as scraped result
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ignore_existing_content : bool
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if ExternalResource already has content, ignore that and either use preloaded_content or call scrape()
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"""
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if auto_link:
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auto_create = True
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if auto_create:
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auto_save = True
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p = self.get_resource()
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resource_content = {}
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if not self.resource:
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return None
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if not p.ready or ignore_existing_content:
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if isinstance(preloaded_content, ResourceContent):
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resource_content = preloaded_content
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elif isinstance(preloaded_content, dict):
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resource_content = ResourceContent(**preloaded_content)
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else:
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resource_content = self.scrape()
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if resource_content:
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p.update_content(resource_content)
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if not p.ready:
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_logger.error(f"unable to get resource {self.url} ready")
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return None
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if auto_create: # and (p.item is None or p.item.is_deleted):
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self.get_item()
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if auto_save:
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p.save()
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if p.item:
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p.item.merge_data_from_external_resources(ignore_existing_content)
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p.item.save()
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self.scrape_additional_data()
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if auto_link:
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for linked_resource in p.required_resources:
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linked_site = SiteManager.get_site_by_url(linked_resource["url"])
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if linked_site:
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linked_site.get_resource_ready(
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auto_link=False,
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preloaded_content=linked_resource.get("content"),
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)
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else:
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_logger.error(f'unable to get site for {linked_resource["url"]}')
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if p.related_resources:
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django_rq.get_queue("crawl").enqueue(crawl_related_resources_task, p.pk)
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if p.item:
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p.item.update_linked_items_from_external_resource(p)
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p.item.save()
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return p
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class SiteManager:
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registry = {}
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@staticmethod
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def register(target) -> Callable:
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id_type = target.ID_TYPE
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if id_type in SiteManager.registry:
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raise ValueError(f"Site for {id_type} already exists")
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SiteManager.registry[id_type] = target
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return target
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@staticmethod
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def get_site_cls_by_id_type(typ: str) -> AbstractSite:
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if typ in SiteManager.registry:
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return SiteManager.registry[typ]
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else:
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raise ValueError(f"Site for {typ} not found")
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@staticmethod
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def get_site_by_url(url: str) -> AbstractSite | None:
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if not url:
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return None
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cls = next(
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filter(lambda p: p.validate_url(url), SiteManager.registry.values()), None
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)
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if cls is None:
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cls = next(
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filter(
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lambda p: p.validate_url_fallback(url),
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SiteManager.registry.values(),
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),
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None,
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)
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return cls(url) if cls else None
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@staticmethod
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def get_site_by_id(id_type: IdType, id_value: str) -> AbstractSite | None:
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if not id_type in SiteManager.registry:
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return None
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cls = SiteManager.registry[id_type]
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return cls(id_value=id_value)
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@staticmethod
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def get_id_by_url(url: str):
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site = SiteManager.get_site_by_url(url)
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return site.url_to_id(url) if site else None
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@staticmethod
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def get_all_sites():
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return SiteManager.register.values()
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ExternalResource.get_site = lambda resource: SiteManager.get_site_cls_by_id_type(
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resource.id_type
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) # type: ignore
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def crawl_related_resources_task(resource_pk):
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resource = ExternalResource.objects.filter(pk=resource_pk).first()
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if not resource:
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_logger.warn(f"crawl resource not found {resource_pk}")
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return
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links = resource.related_resources
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for w in links:
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try:
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item = None
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site = None
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if w.get("id_value") and w.get("id_type"):
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site = SiteManager.get_site_by_id(w["id_type"], w["id_value"])
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if not site and w.get("url"):
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site = SiteManager.get_site_by_url(w["url"])
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if site:
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site.get_resource_ready(ignore_existing_content=False, auto_link=True)
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item = site.get_item()
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if item:
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_logger.info(f"crawled {w} {item}")
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else:
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_logger.warn(f"crawl {w} failed")
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except Exception as e:
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_logger.warn(f"crawl {w} error {e}")
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