Merge "Store topic of a change in Notedb"

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

@@ -250,6 +250,7 @@ public class ChangeInserter extends BatchUpdate.InsertChangeOp {
     }
     db.patchSets().insert(Collections.singleton(patchSet));
     db.changes().insert(Collections.singleton(change));
+    update.setTopic(change.getTopic());
     LabelTypes labelTypes = ctl.getProjectControl().getLabelTypes();
     approvalsUtil.addReviewers(db, update, labelTypes, change,
         patchSet, patchSetInfo, reviewers, Collections.<Account.Id> emptySet());

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

@@ -116,6 +116,7 @@ public class PutTopic implements RestModifyView<ChangeResource, Input>,
             oldTopicName, newTopicName);
       }
       change.setTopic(Strings.emptyToNull(newTopicName));
+      ctx.getChangeUpdate().setTopic(change.getTopic());
       ChangeUtil.updated(change);
       ctx.getDb().changes().update(Collections.singleton(change));
 

gerrit-server/src/main/java/com/google/gerrit/server/git/ReceiveCommits.java

@@ -101,6 +101,7 @@ import com.google.gerrit.server.edit.ChangeEdit;
 import com.google.gerrit.server.edit.ChangeEditUtil;
 import com.google.gerrit.server.events.CommitReceivedEvent;
 import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
+import com.google.gerrit.server.git.BatchUpdate.ChangeContext;
 import com.google.gerrit.server.git.MultiProgressMonitor.Task;
 import com.google.gerrit.server.git.validators.CommitValidationException;
 import com.google.gerrit.server.git.validators.CommitValidationMessage;
@@ -1795,6 +1796,16 @@ public class ReceiveCommits {
               ins.getChange().getId(),
               hashtagsFactory.create(new HashtagsInput(magicBranch.hashtags))
                 .setRunHooks(false));
+          if (!Strings.isNullOrEmpty(magicBranch.topic)) {
+            bu.addOp(
+                ins.getChange().getId(),
+                new BatchUpdate.Op() {
+                  @Override
+                  public void updateChange(ChangeContext ctx) throws Exception {
+                    ctx.getChangeUpdate().setTopic(magicBranch.topic);
+                  }
+                });
+          }
         }
         bu.execute();
       }
@@ -2241,11 +2252,15 @@ public class ReceiveCommits {
         recipients.add(magicBranch.getMailRecipients());
         approvals = magicBranch.labels;
         Set<String> hashtags = magicBranch.hashtags;
+        ChangeNotes notes = changeCtl.getNotes().load();
         if (!hashtags.isEmpty()) {
-          ChangeNotes notes = changeCtl.getNotes().load();
           hashtags.addAll(notes.getHashtags());
           update.setHashtags(hashtags);
         }
+        if (magicBranch.topic != null
+            && !magicBranch.topic.equals(notes.getChange().getTopic())) {
+          update.setTopic(magicBranch.topic);
+        }
       }
       recipients.add(getRecipientsFromFooters(accountResolver, newPatchSet, footerLines));
       recipients.remove(me);

gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeNoteUtil.java

@@ -33,6 +33,7 @@ public class ChangeNoteUtil {
   static final FooterKey FOOTER_STATUS = new FooterKey("Status");
   static final FooterKey FOOTER_SUBMITTED_WITH =
       new FooterKey("Submitted-with");
+  static final FooterKey FOOTER_TOPIC = new FooterKey("Topic");
 
   public static String changeRefName(Change.Id id) {
     StringBuilder r = new StringBuilder();

gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeNotes.java

@@ -18,6 +18,7 @@ import static com.google.gerrit.server.notedb.ChangeNoteUtil.GERRIT_PLACEHOLDER_
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Function;
+import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableListMultimap;
 import com.google.common.collect.ImmutableSet;
@@ -264,6 +265,7 @@ public class ChangeNotes extends AbstractChangeNotes<ChangeNotes> {
       allChangeMessages = parser.buildAllMessages();
       comments = ImmutableListMultimap.copyOf(parser.comments);
       noteMap = parser.commentNoteMap;
+      change.setTopic(Strings.emptyToNull(parser.topic));
 
       if (parser.hashtags != null) {
         hashtags = ImmutableSet.copyOf(parser.hashtags);

gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeNotesParser.java

@@ -18,6 +18,7 @@ import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_HASHTAGS;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_LABEL;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_PATCH_SET;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_STATUS;
+import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_TOPIC;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_SUBMITTED_WITH;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.GERRIT_PLACEHOLDER_HOST;
 
@@ -77,6 +78,7 @@ class ChangeNotesParser implements AutoCloseable {
   final Multimap<RevId, PatchLineComment> comments;
   NoteMap commentNoteMap;
   Change.Status status;
+  String topic;
   Set<String> hashtags;
 
   private final Change.Id changeId;
@@ -155,6 +157,9 @@ class ChangeNotesParser implements AutoCloseable {
     PatchSet.Id psId = parsePatchSetId(commit);
     Account.Id accountId = parseIdent(commit);
     parseChangeMessage(psId, accountId, commit);
+    if (topic == null) {
+      topic = parseTopic(commit);
+    }
     parseHashtags(commit);
 
 
@@ -175,6 +180,18 @@ class ChangeNotesParser implements AutoCloseable {
     }
   }
 
+  private String parseTopic(RevCommit commit)
+      throws ConfigInvalidException {
+    List<String> topicLines = commit.getFooterLines(FOOTER_TOPIC);
+    if (topicLines.isEmpty()) {
+      return null;
+    } else if (topicLines.size() > 1) {
+      throw expectedOneFooter(FOOTER_TOPIC, topicLines);
+    }
+    return topicLines.get(0);
+  }
+
+
   private void parseHashtags(RevCommit commit) throws ConfigInvalidException {
     // Commits are parsed in reverse order and only the last set of hashtags should be used.
     if (hashtags != null) {

gerrit-server/src/main/java/com/google/gerrit/server/notedb/ChangeUpdate.java

@@ -20,11 +20,13 @@ import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_LABEL;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_PATCH_SET;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_STATUS;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_SUBMITTED_WITH;
+import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_TOPIC;
 import static com.google.gerrit.server.notedb.CommentsInNotesUtil.addCommentToMap;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Joiner;
 import com.google.common.base.Optional;
+import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
@@ -92,6 +94,7 @@ public class ChangeUpdate extends AbstractChangeUpdate {
   private List<SubmitRecord> submitRecords;
   private final CommentsInNotesUtil commentsUtil;
   private List<PatchLineComment> comments;
+  private String topic;
   private Set<String> hashtags;
   private String changeMessage;
   private ChangeNotes notes;
@@ -316,6 +319,10 @@ public class ChangeUpdate extends AbstractChangeUpdate {
 
   }
 
+  public void setTopic(String topic) {
+    this.topic = Strings.nullToEmpty(topic);
+  }
+
   public void setHashtags(Set<String> hashtags) {
     this.hashtags = hashtags;
   }
@@ -418,6 +425,10 @@ public class ChangeUpdate extends AbstractChangeUpdate {
       addFooter(msg, FOOTER_STATUS, status.name().toLowerCase());
     }
 
+    if (topic != null) {
+      addFooter(msg, FOOTER_TOPIC, topic);
+    }
+
     if (hashtags != null) {
       addFooter(msg, FOOTER_HASHTAGS, Joiner.on(",").join(hashtags));
     }
@@ -481,7 +492,8 @@ public class ChangeUpdate extends AbstractChangeUpdate {
         && status == null
         && subject == null
         && submitRecords == null
-        && hashtags == null;
+        && hashtags == null
+        && topic == null;
   }
 
   private static StringBuilder addFooter(StringBuilder sb, FooterKey footer) {

gerrit-server/src/test/java/com/google/gerrit/server/notedb/ChangeNotesParserTest.java

@@ -168,6 +168,23 @@ public class ChangeNotesParserTest extends AbstractChangeNotesTest {
         + "Reviewer: 1@gerrit\n");
   }
 
+  @Test
+  public void parseTopic() throws Exception {
+    assertParseSucceeds("Update change\n"
+        + "\n"
+        + "Patch-Set: 1\n"
+        + "Topic: Some Topic");
+    assertParseSucceeds("Update change\n"
+        + "\n"
+        + "Patch-Set: 1\n"
+        + "Topic:");
+    assertParseFails("Update change\n"
+        + "\n"
+        + "Patch-Set: 1\n"
+        + "Topic: Some Topic\n"
+        + "Topic: Other Topic");
+  }
+
   private RevCommit writeCommit(String body) throws Exception {
     return writeCommit(body, ChangeNoteUtil.newIdent(
         changeOwner.getAccount(), TimeUtil.nowTs(), serverIdent,

gerrit-server/src/test/java/com/google/gerrit/server/notedb/ChangeNotesTest.java

@@ -370,6 +370,43 @@ public class ChangeNotesTest extends AbstractChangeNotesTest {
     assertThat(notes.getHashtags()).isEqualTo(hashtags);
   }
 
+  @Test
+  public void topicChangeNotes() throws Exception {
+    Change c = newChange();
+    ChangeUpdate update = newUpdate(c, changeOwner);
+
+    // initially topic is not set
+    ChangeNotes notes = newNotes(c);
+    notes = newNotes(c);
+    assertThat(notes.getChange().getTopic()).isNull();
+
+    // set topic
+    String topic = "myTopic";
+    update.setTopic(topic);
+    update.commit();
+    notes = newNotes(c);
+    assertThat(notes.getChange().getTopic()).isEqualTo(topic);
+
+    // clear topic by setting empty string
+    update.setTopic("");
+    update.commit();
+    notes = newNotes(c);
+    assertThat(notes.getChange().getTopic()).isNull();
+
+    // set other topic
+    topic = "otherTopic";
+    update.setTopic(topic);
+    update.commit();
+    notes = newNotes(c);
+    assertThat(notes.getChange().getTopic()).isEqualTo(topic);
+
+    // clear topic by setting null
+    update.setTopic(null);
+    update.commit();
+    notes = newNotes(c);
+    assertThat(notes.getChange().getTopic()).isNull();
+  }
+
   @Test
   public void emptyExceptSubject() throws Exception {
     ChangeUpdate update = newUpdate(newChange(), changeOwner);