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brave_engine.py
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brave_engine.py
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import requests
from typing import List, Optional
from haystack import Document
from haystack.nodes.search_engine.base import SearchEngine
class BraveEngine(SearchEngine):
"""
Search engine using Brave API.
"""
def __init__(self, api_key: str, top_k: Optional[int] = 10):
"""
:param api_key: API key for the Brave API.
:param top_k: Number of documents to return.
For example, you can set 'num' to 20 to increase the number of search results.
"""
super().__init__()
self.api_key = api_key
self.top_k = top_k
def search(self, query: str, **kwargs) -> List[Document]:
"""
:param query: Query string.
:param kwargs: Additional parameters passed to the Brave API, such as top_k.
:return: List[Document]
"""
top_k = kwargs.pop("top_k", self.top_k)
url = f"https://api.search.brave.com/res/v1/web/search?count={top_k}&q={query}"
headers = {
'Accept-Encoding': 'gzip, deflate, br',
'Content-Type': 'application/json',
'X-Subscription-Token': self.api_key
}
response = requests.get(url, headers=headers, timeout=30)
if response.status_code != 200:
raise Exception(f"Error while querying {self.__class__.__name__}: {response.text}")
documents = []
try:
content = response.json()
for position, result in enumerate(content["web"]["results"]):
result["position"] = position
result["link"] = result["url"]
document = Document.from_dict(result, field_map={"description": "content"})
documents.append(document)
except Exception as e:
return []
return self.score_results(documents, False)