feat: SearXNG como motor principal, DDG como fallback

src/scraper/exhaustive.py

@@ -157,7 +157,7 @@ class ExhaustiveScraper:
         """Initial broad search across multiple sources"""
         logger.info("Seeding research", topic=self.topic)
         tasks = [
-            self._seed_duckduckgo(),
+            self._seed_search(),
             self._seed_wikipedia(),
             self._seed_reddit(),
             self._seed_youtube(),
@@ -212,16 +212,66 @@ class ExhaustiveScraper:
                            error=str(e), error_type=type(e).__name__)
             return fallback
 
-    async def _seed_duckduckgo(self):
-        """Multiple DDG queries — fresh DDGS() per query to avoid cascading ratelimits"""
+    async def _search_searxng(self, query: str) -> list[dict]:
+        """Busca en SearXNG y retorna lista de {href, title}. Retorna [] si no disponible."""
+        import aiohttp
+        searxng_url = "http://searxng-svc.researchowl.svc.cluster.local:8080/search"
+        params = {
+            "q": query,
+            "format": "json",
+            "engines": "duckduckgo,google,bing,brave",
+            "language": "all",
+        }
+        headers = {
+            "Accept": "application/json",
+            "X-Forwarded-For": "127.0.0.1",
+            "User-Agent": "ResearchOwl/1.0",
+        }
+        try:
+            async with aiohttp.ClientSession() as session:
+                async with session.get(
+                    searxng_url,
+                    params=params,
+                    headers=headers,
+                    timeout=aiohttp.ClientTimeout(total=15)
+                ) as resp:
+                    if resp.status == 200:
+                        data = await resp.json()
+                        results = data.get("results", [])
+                        logger.info("SearXNG query ok", query=query, results=len(results))
+                        return [
+                            {"href": r.get("url", ""), "title": r.get("title", "")}
+                            for r in results
+                            if r.get("url")
+                        ]
+                    else:
+                        logger.warning("SearXNG non-200", status=resp.status, query=query)
+                        return []
+        except Exception as e:
+            logger.warning("SearXNG failed", query=query, error=str(e))
+            return []
+
+    async def _seed_search(self):
+        """SearXNG primary + DDG fallback per query"""
         queries = await self._generate_ddg_queries()
         for query in queries:
             if self._stop:
                 break
+            results = await self._search_searxng(query)
+            if not results:
+                logger.info("SearXNG vacío, usando DDG", query=query)
                 try:
-                # Fresh instance per query — a ratelimit on one won't poison the rest
                     with DDGS() as ddgs:
-                    results = list(ddgs.text(query, max_results=settings.max_pages_per_search))
+                        ddg_results = list(ddgs.text(
+                            query,
+                            max_results=settings.max_pages_per_search
+                        ))
+                    results = ddg_results
+                    logger.info("DDG fallback ok", query=query, results=len(results))
+                except Exception as e:
+                    logger.warning("DDG fallback failed", query=query, error=str(e))
+                    results = []
+
             for r in results:
                 url = normalize_url(r.get("href", ""))
                 if url and not is_blacklisted(url):
@@ -231,10 +281,7 @@ class ExhaustiveScraper:
                         depth=0,
                         title=r.get("title")
                     )
-                logger.info("DDG query ok", query=query, results=len(results))
-            except Exception as e:
-                logger.warning("DDG query failed", query=query, error=str(e))
-            await asyncio.sleep(random.uniform(3, 8))
+            await asyncio.sleep(random.uniform(1, 3))
 
     async def _seed_wikipedia(self):
         """Search Wikipedia API for correct article URLs.