fix: isolate on-chain provider outages

dashboard/server.py

@@ -158,6 +158,27 @@ def load_history():
 
 # ── Background scraper ────────────────────────────────────────────────────
 
+
+def _scrape_onchain_sources():
+    """Run independent on-chain providers so one outage cannot mask the other."""
+    observations = {}
+    errors = []
+    successful_sources = 0
+    providers = (
+        ("LookIntoBitcoin", "scrapers.lookintobitcoin"),
+        ("CheckOnChain", "scrapers.checkonchain"),
+    )
+    for display_name, module_name in providers:
+        try:
+            module = __import__(module_name, fromlist=["scrape_all"])
+            observations.update(module.scrape_all())
+            successful_sources += 1
+        except Exception as exc:
+            log.error("%s scraping failed: %s\n%s", display_name, exc, traceback.format_exc())
+            errors.append(f"{display_name}: {exc}")
+    return observations, errors, successful_sources
+
+
 def run_scrape(force_full=False):
     """Run a scrape cycle and update cache.
 
@@ -262,30 +283,20 @@ def run_scrape(force_full=False):
 
         if refresh_onchain:
             log.info("Refreshing on-chain metrics (forced, missing, or TTL expired)...")
-            try:
-                from scrapers import lookintobitcoin
-                onchain = lookintobitcoin.scrape_all()
-                try:
-                    from scrapers import checkonchain
-                    onchain.update(checkonchain.scrape_all())
-                except Exception as e:
-                    log.error("CheckOnChain scraping failed: %s\n%s", e, traceback.format_exc())
-                    cycle_errors.append(f"CheckOnChain: {e}")
-                checkonchain_keys = {"sopr", "sellside_risk", "active_address_momentum",
-                                     "txcount_momentum", "nvt_price", "vdd_multiple"}
-                for key in onchain_keys:
-                    source = "checkonchain" if key in checkonchain_keys else "lookintobitcoin"
-                    metrics[key] = merge_observation(
-                        existing_cache.get(key), onchain.get(key), source=source,
-                        error="metric missing from scrape",
-                    )
+            onchain, onchain_errors, successful_sources = _scrape_onchain_sources()
+            cycle_errors.extend(onchain_errors)
+            checkonchain_keys = {"sopr", "sellside_risk", "active_address_momentum",
+                                 "txcount_momentum", "nvt_price", "vdd_multiple"}
+            for key in onchain_keys:
+                source = "checkonchain" if key in checkonchain_keys else "lookintobitcoin"
+                metrics[key] = merge_observation(
+                    existing_cache.get(key), onchain.get(key), source=source,
+                    error="metric missing from scrape",
+                )
+            if successful_sources:
                 metrics["_onchain_timestamp"] = datetime.now(timezone.utc).isoformat()
-            except Exception as e:
-                log.error("LookIntoBitcoin scraping failed: %s\n%s", e, traceback.format_exc())
-                _last_error = f"On-chain scraping failed: {e}"
-                for k in onchain_keys:
-                    if k in existing_cache:
-                        metrics[k] = existing_cache[k]
+            elif "_onchain_timestamp" in existing_cache:
+                metrics["_onchain_timestamp"] = existing_cache["_onchain_timestamp"]
         else:
             # Reuse cached on-chain values — they're stored permanently
             log.info("Reusing cached on-chain data (use Full Refresh to re-scrape)")

tests/test_server_reliability.py

@@ -108,6 +108,21 @@ def test_partial_fast_scrape_preserves_last_known_good_metric(server, monkeypatc
     assert saved["fear_greed"]["source"] == "alternative.me"
 
 
+def test_onchain_sources_fail_independently(server, monkeypatch):
+    fake_lib = types.ModuleType("scrapers.lookintobitcoin")
+    setattr(fake_lib, "scrape_all", lambda: (_ for _ in ()).throw(RuntimeError("LIB down")))
+    fake_coc = types.ModuleType("scrapers.checkonchain")
+    setattr(fake_coc, "scrape_all", lambda: {"sopr": {"value": 0.99}})
+    monkeypatch.setitem(sys.modules, "scrapers.lookintobitcoin", fake_lib)
+    monkeypatch.setitem(sys.modules, "scrapers.checkonchain", fake_coc)
+
+    observations, errors, successful_sources = server._scrape_onchain_sources()
+
+    assert observations["sopr"]["value"] == 0.99
+    assert successful_sources == 1
+    assert any("LookIntoBitcoin" in error for error in errors)
+
+
 def test_expired_onchain_timestamp_triggers_real_refresh(server, monkeypatch, tmp_path):
     old = datetime.now(timezone.utc) - timedelta(hours=7)
     cache_path = tmp_path / "cache.json"