Support online search with Searxng as zero config, self-hostable solution (#1010)

This allows online search to work out of the box again 
for self-hosting users, as no auth/api key setup required.

Docker users do not need to change anything in their setup flow.
Direct installers can setup Searxng locally or use public instances if
they do not want to use any of the other providers (like Jina, Serper)

Resolves #749. Resolves #990

docker-compose.yml

@@ -18,11 +18,19 @@ services:
     image: ghcr.io/khoj-ai/terrarium:latest
     ports:
       - "8080:8080"
+  search:
+    image: docker.io/searxng/searxng:latest
+    ports:
+      - "42113:8080"
+    volumes:
+      - khoj_search:/etc/searxng
+    environment:
+      - SEARXNG_BASE_URL=http://localhost:42113/
   server:
     depends_on:
       database:
         condition: service_healthy
-    # Use the following line to use the latest version of khoj. Otherwise, it will build from source. Set this to ghcr.io/khoj-ai/khoj-cloud if you want to use the prod image.
+    # Use the following line to use the latest version of khoj. Otherwise, it will build from source. Set this to ghcr.io/khoj-ai/khoj-cloud:latest if you want to use the prod image.
     image: ghcr.io/khoj-ai/khoj:latest
     # Uncomment the following line to build from source. This will take a few minutes. Comment the next two lines out if you want to use the official image.
     # build:
@@ -51,6 +59,8 @@ services:
       - KHOJ_ADMIN_PASSWORD=password
       # Default URL of Terrarium, the Python sandbox used by Khoj to run code. Its container is specified above
       - KHOJ_TERRARIUM_URL=http://host.docker.internal:8080
+      # Default URL of SearxNG, the default web search engine used by Khoj. Its container is specified above
+      - KHOJ_SEARXNG_URL=http://host.docker.internal:42113
       # Uncomment line below to use with Ollama running on your local machine at localhost:11434.
       # Change URL to use with other OpenAI API compatible providers like VLLM, LMStudio etc.
       # - OPENAI_API_BASE=http://host.docker.internal:11434/v1/
@@ -85,7 +95,7 @@ services:
       # Telemetry helps us prioritize feature development and understand how people are using Khoj
       # Read more at https://docs.khoj.dev/miscellaneous/telemetry
       # - KHOJ_TELEMETRY_DISABLE=True
-    # Comment out this line when you're using the official ghcr.io/khoj-ai/khoj-cloud prod image.
+    # Comment out this line when you're using the official ghcr.io/khoj-ai/khoj-cloud:latest prod image.
     command: --host="0.0.0.0" --port=42110 -vv --anonymous-mode --non-interactive
 
 
@@ -93,3 +103,4 @@ volumes:
   khoj_config:
   khoj_db:
   khoj_models:
+  khoj_search:

documentation/docs/features/online_search.md

@@ -14,8 +14,18 @@ Try it out yourself! https://app.khoj.dev
 
 ## Self-Hosting
 
-Online search can work even with self-hosting! Khoj uses [JinaAI's reader API](https://jina.ai/reader/) to search online and read webpages by default. You can get a free API key via https://jina.ai/reader. Set the `JINA_API_KEY` environment variable to your Jina AI reader API key to enable online search.
+### Search
 
-To improve online search, set the `SERPER_DEV_API_KEY` environment variable to your [Serper.dev](https://serper.dev/) API key. These search results include additional context like answer box, knowledge graph etc.
+Online search can work even with self-hosting! You have a few options:
 
-For advanced webpage reading, set the `OLOSTEP_API_KEY` environment variable to your [Olostep](https://www.olostep.com/) API key. This has a higher success rate at reading webpages than the default webpage reader.
+- If you're using Docker, online search should work out of the box with [searxng](https://github.com/searxng/searxng) using our standard `docker-compose.yml`.
+- For a non-local, free solution, you can use [JinaAI's reader API](https://jina.ai/reader/) to search online and read webpages. You can get a free API key via https://jina.ai/reader. Set the `JINA_API_KEY` environment variable to your Jina AI reader API key to enable online search.
+- To get production-grade, fast online search, set the `SERPER_DEV_API_KEY` environment variable to your [Serper.dev](https://serper.dev/) API key. These search results include additional context like answer box, knowledge graph etc.
+
+### Webpage Reading
+
+Out of the box, you **don't have to do anything to enable webpage reading**. Khoj will automatically read webpages by using the `requests` library. To get more distributed and scalable webpage reading, you can use the following options:
+
+- If you're using Jina AI's reader API for search, it should work automatically for webpage reading as well.
+- For scalable webpage scraping, you can use [Firecrawl](https://www.firecrawl.dev/). Create a new [Webscraper](http://localhost:42110/server/admin/database/webscraper/add/). Set your Firecrawl API key to the Api Key field, and set the type to Firecrawl.
+- For advanced webpage reading, you can use [Olostep](https://www.olostep.com/). This has a higher success rate at reading webpages than the default webpage readers. Create a new [Webscraper](http://localhost:42110/server/admin/database/webscraper/add/). Set your Olostep API key to the Api Key field, and set the type to Olostep.

src/khoj/processor/tools/online_search.py

@@ -102,8 +102,14 @@ async def search_online(
         async for event in send_status_func(f"**Searching the Internet for**: {subqueries_str}"):
             yield {ChatEvent.STATUS: event}
 
+    if SERPER_DEV_API_KEY:
+        search_func = search_with_serper
+    elif JINA_API_KEY:
+        search_func = search_with_jina
+    else:
+        search_func = search_with_searxng
+
     with timer(f"Internet searches for {subqueries} took", logger):
-        search_func = search_with_google if SERPER_DEV_API_KEY else search_with_jina
         search_tasks = [search_func(subquery, location) for subquery in subqueries]
         search_results = await asyncio.gather(*search_tasks)
         response_dict = {subquery: search_result for subquery, search_result in search_results}
@@ -148,7 +154,48 @@ async def search_online(
     yield response_dict
 
 
-async def search_with_google(query: str, location: LocationData) -> Tuple[str, Dict[str, List[Dict]]]:
+async def search_with_searxng(query: str, location: LocationData) -> Tuple[str, Dict[str, List[Dict]]]:
+    """Search using local SearXNG instance."""
+    # Use environment variable or default to localhost
+    searxng_url = os.getenv("KHOJ_SEARXNG_URL", "http://localhost:42113")
+    search_url = f"{searxng_url}/search"
+    country_code = location.country_code.lower() if location and location.country_code else "us"
+
+    params = {"q": query, "format": "html", "language": "en", "country": country_code, "categories": "general"}
+
+    async with aiohttp.ClientSession() as session:
+        try:
+            async with session.get(search_url, params=params) as response:
+                if response.status != 200:
+                    logger.error(f"SearXNG search failed to call {searxng_url}: {await response.text()}")
+                    return query, {}
+
+                html_content = await response.text()
+
+                soup = BeautifulSoup(html_content, "html.parser")
+                organic_results = []
+
+                for result in soup.find_all("article", class_="result"):
+                    title_elem = result.find("a", rel="noreferrer")
+                    if title_elem:
+                        title = title_elem.text.strip()
+                        link = title_elem["href"]
+
+                        description_elem = result.find("p", class_="content")
+                        description = description_elem.text.strip() if description_elem else None
+
+                        organic_results.append({"title": title, "link": link, "description": description})
+
+                extracted_search_result = {"organic": organic_results}
+
+                return query, extracted_search_result
+
+        except Exception as e:
+            logger.error(f"Error searching with SearXNG: {str(e)}")
+            return query, {}
+
+
+async def search_with_serper(query: str, location: LocationData) -> Tuple[str, Dict[str, List[Dict]]]:
     country_code = location.country_code.lower() if location and location.country_code else "us"
     payload = json.dumps({"q": query, "gl": country_code})
     headers = {"X-API-KEY": SERPER_DEV_API_KEY, "Content-Type": "application/json"}