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"""Util that calls Wikipedia."""
import logging
from typing import Any, Dict, List, Optional
from langchain_core.documents import Document
from langchain_core.pydantic_v1 import BaseModel, root_validator
logger = logging.getLogger(__name__)
WIKIPEDIA_MAX_QUERY_LENGTH = 300
class WikipediaAPIWrapper(BaseModel):
"""Wrapper around WikipediaAPI.
To use, you should have the ``wikipedia`` python package installed.
This wrapper will use the Wikipedia API to conduct searches and
fetch page summaries. By default, it will return the page summaries
of the top-k results.
It limits the Document content by doc_content_chars_max.
"""
wiki_client: Any #: :meta private:
top_k_results: int = 3
lang: str = "en"
load_all_available_meta: bool = False
doc_content_chars_max: int = 4000
@root_validator()
def validate_environment(cls, values: Dict) -> Dict:
"""Validate that the python package exists in environment."""
try:
import wikipedia
wikipedia.set_lang(values["lang"])
values["wiki_client"] = wikipedia
except ImportError:
raise ImportError(
"Could not import wikipedia python package. "
"Please install it with `pip install wikipedia`."
)
return values
def run(self, query: str) -> str:
"""Run Wikipedia search and get page summaries."""
page_titles = self.wiki_client.search(query[:WIKIPEDIA_MAX_QUERY_LENGTH])
summaries = []
for page_title in page_titles[: self.top_k_results]:
if wiki_page := self._fetch_page(page_title):
if summary := self._formatted_page_summary(page_title, wiki_page):
summaries.append(summary)
if not summaries:
return "No good Wikipedia Search Result was found"
return "\n\n".join(summaries)[: self.doc_content_chars_max]
@staticmethod
def _formatted_page_summary(page_title: str, wiki_page: Any) -> Optional[str]:
return f"Page: {page_title}\nSummary: {wiki_page.summary}"
def _page_to_document(self, page_title: str, wiki_page: Any) -> Document:
main_meta = {
"title": page_title,
"summary": wiki_page.summary,
"source": wiki_page.url,
}
add_meta = (
{
"categories": wiki_page.categories,
"page_url": wiki_page.url,
"image_urls": wiki_page.images,
"related_titles": wiki_page.links,
"parent_id": wiki_page.parent_id,
"references": wiki_page.references,
"revision_id": wiki_page.revision_id,
"sections": wiki_page.sections,
}
if self.load_all_available_meta
else {}
)
doc = Document(
page_content=wiki_page.content[: self.doc_content_chars_max],
metadata={
**main_meta,
**add_meta,
},
)
return doc
def _fetch_page(self, page: str) -> Optional[str]:
try:
return self.wiki_client.page(title=page, auto_suggest=False)
except (
self.wiki_client.exceptions.PageError,
self.wiki_client.exceptions.DisambiguationError,
):
return None
def load(self, query: str) -> List[Document]:
"""
Run Wikipedia search and get the article text plus the meta information.
See
Returns: a list of documents.
"""
page_titles = self.wiki_client.search(query[:WIKIPEDIA_MAX_QUERY_LENGTH])
docs = []
for page_title in page_titles[: self.top_k_results]:
if wiki_page := self._fetch_page(page_title):
if doc := self._page_to_document(page_title, wiki_page):
docs.append(doc)
return docs
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