add a state for failed updates

core/src/main/groovy/com/muwire/core/trust/RemoteTrustList.groovy

@@ -7,7 +7,7 @@ import com.muwire.core.Persona
 import net.i2p.util.ConcurrentHashSet
 
 class RemoteTrustList {
-    public enum Status { NEW, UPDATING, UPDATED }
+    public enum Status { NEW, UPDATING, UPDATED, UPDATE_FAILED }
     
     private final Persona persona
     private final Set<Persona> good, bad

core/src/main/groovy/com/muwire/core/trust/TrustSubscriber.groovy

@@ -94,13 +94,15 @@ class TrustSubscriber {
         public void run() {
             trustList.status = RemoteTrustList.Status.UPDATING
             eventBus.publish(new TrustSubscriptionUpdatedEvent(trustList : trustList))
-            check(trustList, System.currentTimeMillis())
+            if (check(trustList, System.currentTimeMillis()))
                 trustList.status = RemoteTrustList.Status.UPDATED
+            else
+                trustList.status = RemoteTrustList.Status.UPDATE_FAILED
             eventBus.publish(new TrustSubscriptionUpdatedEvent(trustList : trustList))
         }
     }
 
-    private void check(RemoteTrustList trustList, long now) {
+    private boolean check(RemoteTrustList trustList, long now) {
         log.info("fetching trust list from ${trustList.persona.getHumanReadableName()}")
         Endpoint endpoint = null
         try {
@@ -118,7 +120,7 @@ class TrustSubscriber {
             
             if (code != 200) {
                 log.info("couldn't fetch trust list, code $code")
-                return
+                return false
             }
             
             // swallow any headers
@@ -147,8 +149,10 @@ class TrustSubscriber {
             trustList.bad.clear()
             trustList.bad.addAll(bad)
             
+            return true
         } catch (Exception e) {
             log.log(Level.WARNING,"exception fetching trust list from ${trustList.persona.getHumanReadableName()}",e)
+            return false
         } finally {
             endpoint?.close()
         }

gui/griffon-app/views/com/muwire/gui/MainFrameView.groovy

@@ -488,6 +488,11 @@ class MainFrameView {
                 model.updateButtonEnabled = true
                 model.unsubscribeButtonEnabled = true
                 break
+                case RemoteTrustList.Status.UPDATE_FAILED:
+                model.reviewButtonEnabled = false
+                model.updateButtonEnabled = true
+                model.unsubscribeButtonEnabled = true
+                break
             }
         })