Make NoBuildEvent an instance of BuildEvent

Not all bazel invocations produce a BuildStartingEvent; in fact, not all
commands include building. Those invocations produce a NoBuildEvent instead.
However, some of those invocations, like "query", might still have important
machine-readable information to report, like errors in BUILD files. So, make
the NoBuildEvent a build event, capable of starting a stream of build events.

Change-Id: I7cab65f029cdc0176ea5c4970308de296fb73177
PiperOrigin-RevId: 159230205

1 files changed, 47 insertions, 4 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/NoBuildEvent.java b/src/main/java/com/google/devtools/build/lib/analysis/NoBuildEvent.java
index 152f39f0c0..7974bddaac 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/NoBuildEvent.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/NoBuildEvent.java
@@ -14,7 +14,50 @@
 
 package com.google.devtools.build.lib.analysis;
 
-/**
- * This event raised to indicate that no build will be happening for the given command.
- */
-public final class NoBuildEvent {}
+import com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.buildeventstream.BuildEvent;
+import com.google.devtools.build.lib.buildeventstream.BuildEventConverters;
+import com.google.devtools.build.lib.buildeventstream.BuildEventId;
+import com.google.devtools.build.lib.buildeventstream.BuildEventStreamProtos;
+import com.google.devtools.build.lib.buildeventstream.GenericBuildEvent;
+import com.google.devtools.build.lib.buildeventstream.ProgressEvent;
+import java.util.Collection;
+
+/** This event raised to indicate that no build will be happening for the given command. */
+public final class NoBuildEvent implements BuildEvent {
+  private final String command;
+  private final Long startTimeMillis;
+
+  public NoBuildEvent(String command, Long startTimeMillis) {
+    this.command = command;
+    this.startTimeMillis = startTimeMillis;
+  }
+
+  public NoBuildEvent() {
+    this(null, null);
+  }
+
+  @Override
+  public Collection<BuildEventId> getChildrenEvents() {
+    return ImmutableList.of(ProgressEvent.INITIAL_PROGRESS_UPDATE);
+  }
+
+  @Override
+  public BuildEventId getEventId() {
+    return BuildEventId.buildStartedId();
+  }
+
+  @Override
+  public BuildEventStreamProtos.BuildEvent asStreamProto(BuildEventConverters converters) {
+    BuildEventStreamProtos.BuildStarted.Builder started =
+        BuildEventStreamProtos.BuildStarted.newBuilder()
+            .setBuildToolVersion(BlazeVersionInfo.instance().getVersion());
+    if (command != null) {
+      started.setCommand(command);
+    }
+    if (startTimeMillis != null) {
+      started.setStartTimeMillis(startTimeMillis);
+    }
+    return GenericBuildEvent.protoChaining(this).setStarted(started.build()).build();
+  }
+}