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from contextlib import asynccontextmanager
from typing import Optional
from fastapi import FastAPI
from pydantic import BaseModel, Field
from playwright.async_api import async_playwright, Browser, BrowserContext, Page
from urllib.parse import quote_plus
import logging
import re
import uvicorn
logging.basicConfig(level=logging.INFO)
# playwright global context
playwright = None
pw_browser: Browser = None
@asynccontextmanager
async def api_lifespan(app: FastAPI):
global playwright, pw_browser
playwright = await async_playwright().start()
pw_browser = await playwright.chromium.launch(headless=True)
yield
await pw_browser.close()
await playwright.stop()
app = FastAPI(lifespan=api_lifespan)
class APISearchParams(BaseModel):
queries: list[str] = Field(...,
description="The list of queries to search for")
n_results: int = Field(
10, description="Number of results to return for each query. Valid values are 10, 25, 50 and 100")
class APIPatentResults(BaseModel):
"""Response of /search_patents endpoint"""
error: Optional[str]
results: Optional[list[dict]]
class APIBraveResults(BaseModel):
"""Response of /search_brave endpoint"""
error: Optional[str]
results: Optional[list[dict]]
async def query_google_patents(browser: Browser, q: str, n_results: int = 10):
"""Queries google patents for the specified query and number of results. Returns relevant patents"""
context: BrowserContext = await browser.new_context()
page: Page = await context.new_page()
async def _block_resources(route, request):
if request.resource_type in ["stylesheet", "image"]:
await route.abort()
else:
await route.continue_()
await page.route("**/*", _block_resources)
url = f"https://patents.google.com/?q=({quote_plus(q)})&oq={quote_plus(q)}&num={n_results}"
await page.goto(url)
await page.wait_for_function(
f"""() => document.querySelectorAll('search-result-item').length >= {n_results}""",
timeout=30_000
)
# regex to locate a patent id
PATENT_ID_REGEX = r"\b[A-Z]{2}\d{6,}(?:[A-Z]\d?)?\b"
items = await page.locator("search-result-item").all()
matches = []
for item in items:
all_text = " ".join(await item.locator("span").all_inner_texts())
found = re.findall(PATENT_ID_REGEX, all_text)
if found:
matches.append(found[0])
await context.close()
return matches
async def query_brave_search(browser: Browser, q: str, n_results: int = 10):
"""Queries brave search for the specified query"""
context: BrowserContext = await browser.new_context()
page: Page = await context.new_page()
async def _block_resources(route, request):
if request.resource_type in ["stylesheet", "image"]:
await route.abort()
else:
await route.continue_()
await page.route("**/*", _block_resources)
url = f"https://search.brave.com/search?q={quote_plus(q)}"
await page.goto(url)
results_cards = await page.locator('.snippet').all()
results = []
for result in results_cards:
title = await result.locator('.title').all_inner_texts()
description = await result.locator('.snippet-description').all_inner_texts()
url = await result.locator('a').nth(0).get_attribute('href')
if url.startswith('/'):
continue
results.append({"title": title[0] if len(title) > 0 else "", "body": description[0] if len(
description) > 0 else "", "href": url})
return results[:n_results]
@app.post("/search_scholar")
async def query_google_scholar(params: APISearchParams):
"""Queries google scholar for the specified query"""
return {"error": "Unimplemented"}
@app.post("/search_patents")
async def search_patents(params: APISearchParams) -> APIPatentResults:
"""Searches google patents for the specified queries and returns the found documents."""
results = []
for q in params.queries:
logging.info(f"Searching Google Patents with query `{q}`")
try:
res = await query_google_patents(pw_browser, q, params.n_results)
results.extend(res)
except Exception as e:
logging.error(
f"Failed to query Google Patents with query `{q}`: {e}")
return APIPatentResults(results=[{"href": f"https://patents.google.com/patent/{id}/en", "id": id} for id in results], error=None)
@app.post("/search_brave")
async def search_brave(params: APISearchParams) -> APIBraveResults:
results = []
for q in params.queries:
logging.info(f"Searching Brave search with query `{q}`")
try:
res = await query_brave_search(pw_browser, q, params.n_results)
results.extend(res)
except Exception as e:
logging.error(
f"Failed to query Brave search with query `{q}`: {e}")
return APIBraveResults(results=results, error=None)
uvicorn.run(app, port=7860)
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