fix: scraper - DDG per-query instances, Wikipedia bilingual seed, Reddit throttling

src/scraper/exhaustive.py

@@ -67,7 +67,6 @@ def is_blacklisted(url: str) -> bool:
 
 
 def normalize_url(url: str) -> str:
-    """Remove fragments and tracking params"""
     parsed = urlparse(url)
     clean = parsed._replace(fragment="", query="")
     return clean.geturl().rstrip("/")
@@ -117,7 +116,7 @@ class ExhaustiveScraper:
         await asyncio.gather(*tasks, return_exceptions=True)
 
     async def _seed_duckduckgo(self):
-        """Multiple DDG queries for breadth"""
+        """Multiple DDG queries — fresh DDGS() per query to avoid cascading ratelimits"""
         queries = [
             self.topic,
             f"{self.topic} history facts",
@@ -128,12 +127,12 @@ class ExhaustiveScraper:
             f"{self.topic} documentary",
             f"{self.topic} research study",
         ]
-        try:
-            with DDGS() as ddgs:
         for query in queries:
             if self._stop:
                 break
             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))
                 for r in results:
                     url = normalize_url(r.get("href", ""))
@@ -144,23 +143,21 @@ class ExhaustiveScraper:
                             depth=0,
                             title=r.get("title")
                         )
-                        await asyncio.sleep(settings.request_delay)
+                logger.info("DDG query ok", query=query, results=len(results))
             except Exception as e:
                 logger.warning("DDG query failed", query=query, error=str(e))
-        except Exception as e:
+            await asyncio.sleep(settings.request_delay * 2)
-            logger.error("DDG seeding failed", error=str(e))
 
     async def _seed_wikipedia(self):
-        """Fetch Wikipedia article + all internal links"""
+        """Search Wikipedia API for correct article URLs.
-        topic_encoded = quote_plus(self.topic.replace(" ", "_"))
+        Tries English first, falls back to Spanish if no results found."""
-        wiki_url = f"https://en.wikipedia.org/wiki/{topic_encoded}"
-        await self.db.add_source(self.session_id, wiki_url, "wikipedia", depth=0)
-
-        # Also search Wikipedia API for related articles
-        try:
         http = await self._get_http()
+        added = 0
+
+        for lang in ("en", "es"):
+            try:
                 api_url = (
-                f"https://en.wikipedia.org/w/api.php?action=opensearch"
+                    f"https://{lang}.wikipedia.org/w/api.php?action=opensearch"
                     f"&search={quote_plus(self.topic)}&limit=10&format=json"
                 )
                 async with http.get(api_url) as resp:
@@ -169,14 +166,18 @@ class ExhaustiveScraper:
                     for url in urls:
                         if url:
                             await self.db.add_source(self.session_id, url, "wikipedia", depth=0)
+                            added += 1
+                logger.info("Wikipedia seed", lang=lang, found=len(urls))
+                if added > 0:
+                    break  # English results found — no need to try Spanish
             except Exception as e:
-            logger.warning("Wikipedia API seed failed", error=str(e))
+                logger.warning("Wikipedia API seed failed", lang=lang, error=str(e))
 
     async def _seed_reddit(self):
-        """Search Reddit via old.reddit.com JSON"""
+        """Search Reddit — sequential to avoid rate limiting"""
         try:
             http = await self._get_http()
-            url = f"https://www.reddit.com/search.json?q={quote_plus(self.topic)}&sort=top&limit=25"
+            url = f"https://www.reddit.com/search.json?q={quote_plus(self.topic)}&sort=top&limit=15"
             async with http.get(url, headers={**HEADERS, "User-Agent": "ResearchOwl/1.0"}) as resp:
                 if resp.status == 200:
                     data = await resp.json()
@@ -190,6 +191,9 @@ class ExhaustiveScraper:
                                 self.session_id, full_url, "reddit", depth=0,
                                 title=post_data.get("title")
                             )
+                    logger.info("Reddit seed", found=len(posts), status=resp.status)
+                else:
+                    logger.warning("Reddit seed non-200", status=resp.status)
         except Exception as e:
             logger.warning("Reddit seed failed", error=str(e))
 
@@ -236,8 +240,8 @@ class ExhaustiveScraper:
 
             logger.info("Processing batch", iteration=self.iteration, batch_size=len(pending))
 
-            # Process sources concurrently (but not too many at once)
+            # Reduced concurrency to 3 — avoids triggering Reddit/web rate limits
-            semaphore = asyncio.Semaphore(5)
+            semaphore = asyncio.Semaphore(3)
             tasks = [self._process_source(s, semaphore) for s in pending]
             results = await asyncio.gather(*tasks, return_exceptions=True)
 
@@ -291,6 +295,8 @@ class ExhaustiveScraper:
                     return len(new_urls or [])
                 elif source_type == "reddit":
                     content, title = await self._extract_reddit(url)
+                    # Small delay between Reddit requests to avoid rate limiting
+                    await asyncio.sleep(settings.request_delay)
                 elif source_type == "pdf":
                     content, title = await self._extract_pdf(url)
                 else:
@@ -314,7 +320,14 @@ class ExhaustiveScraper:
 
     async def _mark_scraped(self, source_id: int, content: Optional[str],
                              title: Optional[str], url: str):
-        if not content or len(content) < settings.min_content_length:
+        if not content:
+            logger.debug("No content returned", source_id=source_id, url=url[:60])
+            await self.db.update_source(source_id, status="skipped",
+                                        error="Content too short or empty")
+            return
+        if len(content) < settings.min_content_length:
+            logger.debug("Content too short", source_id=source_id,
+                         length=len(content), url=url[:60])
             await self.db.update_source(source_id, status="skipped",
                                         error="Content too short or empty")
             return
@@ -331,6 +344,7 @@ class ExhaustiveScraper:
             scraped_at=time.time(),
             quality_score=min(1.0, word_count / 1000)
         )
+        logger.info("Source scraped", source_id=source_id, words=word_count, url=url[:60])
 
     # ─── Extractors ───────────────────────────────────────────────────────────
 
@@ -371,10 +385,12 @@ class ExhaustiveScraper:
         return content, title, new_urls[:30]  # cap links per page
 
     async def _extract_wikipedia(self, url: str) -> tuple[Optional[str], Optional[str], list[str]]:
-        """Wikipedia: extract content + follow internal wiki links"""
+        """Wikipedia: extract content + follow internal wiki links.
+        Works for both en.wikipedia.org and es.wikipedia.org."""
         http = await self._get_http()
         async with http.get(url) as resp:
             if resp.status != 200:
+                logger.debug("Wikipedia non-200", status=resp.status, url=url[:60])
                 return None, None, []
             html = await resp.text(errors="replace")
 
@@ -393,13 +409,14 @@ class ExhaustiveScraper:
 
         content = content_div.get_text(separator="\n", strip=True)
 
-        # Extract Wikipedia internal links (only "See also" and body links)
+        # Extract Wikipedia internal links using the URL's actual domain
+        parsed = urlparse(url)
+        wiki_base = f"{parsed.scheme}://{parsed.netloc}"
         new_urls = []
         for a in content_div.find_all("a", href=True):
             href = a["href"]
             if href.startswith("/wiki/") and ":" not in href:
-                full_url = f"https://en.wikipedia.org{href}"
+                full_url = normalize_url(f"{wiki_base}{href}")
-                full_url = normalize_url(full_url)
                 if not await self.db.source_exists(self.session_id, full_url):
                     new_urls.append(full_url)
 
@@ -434,6 +451,7 @@ class ExhaustiveScraper:
                 headers={**HEADERS, "User-Agent": "ResearchOwl/1.0"}
             ) as resp:
                 if resp.status != 200:
+                    logger.debug("Reddit non-200", status=resp.status, url=url[:60])
                     return None, None
                 data = await resp.json()