mirror of https://github.com/hwchase17/langchain
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"""Loader that uses Diffbot to load webpages in text format."""
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import logging
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from typing import Any, List
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import requests
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from langchain.docstore.document import Document
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from langchain.document_loaders.base import BaseLoader
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logger = logging.getLogger(__file__)
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class DiffbotLoader(BaseLoader):
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"""Loader that loads Diffbot file json."""
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def __init__(
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self, api_token: str, urls: List[str], continue_on_failure: bool = True
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):
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"""Initialize with API token, ids, and key."""
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self.api_token = api_token
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self.urls = urls
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self.continue_on_failure = continue_on_failure
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def _diffbot_api_url(self, diffbot_api: str) -> str:
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return f"https://api.diffbot.com/v3/{diffbot_api}"
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def _get_diffbot_data(self, url: str) -> Any:
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"""Get Diffbot file from Diffbot REST API."""
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# TODO: Add support for other Diffbot APIs
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diffbot_url = self._diffbot_api_url("article")
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params = {
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"token": self.api_token,
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"url": url,
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}
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response = requests.get(diffbot_url, params=params, timeout=10)
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# TODO: handle non-ok errors
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return response.json() if response.ok else {}
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def load(self) -> List[Document]:
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"""Extract text from Diffbot on all the URLs and return Document instances"""
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docs: List[Document] = list()
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for url in self.urls:
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try:
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data = self._get_diffbot_data(url)
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text = data["objects"][0]["text"] if "objects" in data else ""
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metadata = {"source": url}
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docs.append(Document(page_content=text, metadata=metadata))
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except Exception as e:
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if self.continue_on_failure:
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logger.error(f"Error fetching or processing {url}, exception: {e}")
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else:
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raise e
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return docs
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