Merge "Invalidate ListFiles ETag when PatchListKey changes"

gerrit-server/src/main/java/com/google/gerrit/server/change/Files.java

@@ -15,6 +15,8 @@
 package com.google.gerrit.server.change;
 
 import com.google.common.collect.Lists;
+import com.google.common.hash.Hasher;
+import com.google.common.hash.Hashing;
 import com.google.gerrit.extensions.common.FileInfo;
 import com.google.gerrit.extensions.registration.DynamicItem;
 import com.google.gerrit.extensions.registration.DynamicMap;
@@ -22,10 +24,10 @@ import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.CacheControl;
 import com.google.gerrit.extensions.restapi.ChildCollection;
+import com.google.gerrit.extensions.restapi.ETagView;
 import com.google.gerrit.extensions.restapi.IdString;
 import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.Response;
-import com.google.gerrit.extensions.restapi.RestReadView;
 import com.google.gerrit.extensions.restapi.RestView;
 import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.reviewdb.client.Change;
@@ -38,6 +40,7 @@ import com.google.gerrit.server.change.AccountPatchReviewStore.PatchSetWithRevie
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.patch.PatchList;
 import com.google.gerrit.server.patch.PatchListCache;
+import com.google.gerrit.server.patch.PatchListKey;
 import com.google.gerrit.server.patch.PatchListNotAvailableException;
 import com.google.gwtorm.server.OrmException;
 import com.google.inject.Inject;
@@ -90,7 +93,7 @@ public class Files implements ChildCollection<RevisionResource, FileResource> {
     return new FileResource(rev, id.get());
   }
 
-  public static final class ListFiles implements RestReadView<RevisionResource> {
+  public static final class ListFiles implements ETagView<RevisionResource> {
     private static final Logger log = LoggerFactory.getLogger(ListFiles.class);
 
     @Option(name = "--base", metaVar = "revision-id")
@@ -322,5 +325,15 @@ public class Files implements ChildCollection<RevisionResource, FileResource> {
       this.parentNum = parentNum;
       return this;
     }
+
+    @Override
+    public String getETag(RevisionResource resource) {
+      Hasher h = Hashing.murmur3_128().newHasher();
+      resource.prepareETag(h, resource.getUser());
+      // File list comes from the PatchListCache, so any change to the key or value should
+      // invalidate ETag.
+      h.putLong(PatchListKey.serialVersionUID);
+      return h.hash().toString();
+    }
   }
 }

gerrit-server/src/main/java/com/google/gerrit/server/change/RevisionResource.java

@@ -14,6 +14,8 @@
 
 package com.google.gerrit.server.change;
 
+import com.google.common.hash.Hasher;
+import com.google.common.hash.Hashing;
 import com.google.gerrit.extensions.restapi.RestResource;
 import com.google.gerrit.extensions.restapi.RestResource.HasETag;
 import com.google.gerrit.extensions.restapi.RestView;
@@ -82,10 +84,15 @@ public class RevisionResource implements RestResource, HasETag {
 
   @Override
   public String getETag() {
-    // Conservative estimate: refresh the revision if its parent change has
-    // changed, so we don't have to check whether a given modification affected
-    // this revision specifically.
-    return change.getETag();
+    Hasher h = Hashing.murmur3_128().newHasher();
+    prepareETag(h, getUser());
+    return h.hash().toString();
+  }
+
+  void prepareETag(Hasher h, CurrentUser user) {
+    // Conservative estimate: refresh the revision if its parent change has changed, so we don't
+    // have to check whether a given modification affected this revision specifically.
+    change.prepareETag(h, user);
   }
 
   Account.Id getAccountId() {