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"""Util that calls DuckDuckGo Search.
No setup required. Free.
https://pypi.org/project/duckduckgo-search/
"""
from typing import Dict, List, Optional
from langchain_core.pydantic_v1 import BaseModel, Extra, root_validator
class DuckDuckGoSearchAPIWrapper(BaseModel):
"""Wrapper for DuckDuckGo Search API.
Free and does not require any setup.
"""
region: Optional[str] = "wt-wt"
safesearch: str = "moderate"
time: Optional[str] = "y"
max_results: int = 5
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
@root_validator()
def validate_environment(cls, values: Dict) -> Dict:
"""Validate that python package exists in environment."""
try:
from duckduckgo_search import DDGS # noqa: F401
except ImportError:
raise ImportError(
"Could not import duckduckgo-search python package. "
"Please install it with `pip install duckduckgo-search`."
)
return values
def get_snippets(self, query: str) -> List[str]:
"""Run query through DuckDuckGo and return concatenated results."""
from duckduckgo_search import DDGS
with DDGS() as ddgs:
results = ddgs.text(
query,
region=self.region,
safesearch=self.safesearch,
timelimit=self.time,
)
if results is None:
return ["No good DuckDuckGo Search Result was found"]
snippets = []
for i, res in enumerate(results, 1):
if res is not None:
snippets.append(res["body"])
if len(snippets) == self.max_results:
break
return snippets
def run(self, query: str) -> str:
snippets = self.get_snippets(query)
return " ".join(snippets)
def results(
self, query: str, num_results: int, backend: str = "api"
) -> List[Dict[str, str]]:
"""Run query through DuckDuckGo and return metadata.
Args:
query: The query to search for.
num_results: The number of results to return.
Returns:
A list of dictionaries with the following keys:
snippet - The description of the result.
title - The title of the result.
link - The link to the result.
"""
from duckduckgo_search import DDGS
with DDGS() as ddgs:
results = ddgs.text(
query,
region=self.region,
safesearch=self.safesearch,
timelimit=self.time,
backend=backend,
)
if results is None:
return [{"Result": "No good DuckDuckGo Search Result was found"}]
def to_metadata(result: Dict) -> Dict[str, str]:
if backend == "news":
return {
"date": result["date"],
"title": result["title"],
"snippet": result["body"],
"source": result["source"],
"link": result["url"],
}
return {
"snippet": result["body"],
"title": result["title"],
"link": result["href"],
}
formatted_results = []
for i, res in enumerate(results, 1):
if res is not None:
formatted_results.append(to_metadata(res))
if len(formatted_results) == num_results:
break
return formatted_results
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