Switch to ProcessHandle for getting the PID (#14842)

* RELNOTES: Refactor system suspend event handling.

We are looking to add more build anomaly reporting, so refactor the current system suspend handling to match the new model where we have a module and an event that we can record.

Note this deprecates the AnomalyRecord out of BES for the time being.

PiperOrigin-RevId: 409502784

* Switch to `ProcessHandle` for getting the pid.

Uses new Java API instead of a native method.

PiperOrigin-RevId: 409973910

* fix test

Co-authored-by: dmaclach <dmaclach@google.com>
Co-authored-by: jhorvitz <jhorvitz@google.com>

src/main/java/com/google/devtools/build/lib/BUILD

@@ -290,7 +290,6 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/packages",
         "//src/main/java/com/google/devtools/build/lib/packages/semantics",
         "//src/main/java/com/google/devtools/build/lib/pkgcache",
-        "//src/main/java/com/google/devtools/build/lib/platform:suspend_counter",
         "//src/main/java/com/google/devtools/build/lib/profiler",
         "//src/main/java/com/google/devtools/build/lib/profiler:google-auto-profiler-utils",
         "//src/main/java/com/google/devtools/build/lib/profiler/memory:allocationtracker",

src/main/java/com/google/devtools/build/lib/analysis/BUILD

@@ -874,7 +874,6 @@ java_library(
         ":blaze_version_info",
         "//src/main/java/com/google/devtools/build/lib/buildeventstream",
         "//src/main/java/com/google/devtools/build/lib/buildeventstream/proto:build_event_stream_java_proto",
-        "//src/main/java/com/google/devtools/build/lib/util:process",
         "//third_party:guava",
     ],
 )

src/main/java/com/google/devtools/build/lib/analysis/NoBuildEvent.java

@@ -22,8 +22,6 @@
 import com.google.devtools.build.lib.buildeventstream.BuildEventStreamProtos.BuildEventId;
 import com.google.devtools.build.lib.buildeventstream.GenericBuildEvent;
 import com.google.devtools.build.lib.buildeventstream.ProgressEvent;
-import com.google.devtools.build.lib.util.ProcessUtils;
-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 {
@@ -55,7 +53,7 @@ public NoBuildEvent() {
   }
 
   @Override
-  public Collection<BuildEventId> getChildrenEvents() {
+  public ImmutableList<BuildEventId> getChildrenEvents() {
     if (separateFinishedEvent) {
       return ImmutableList.of(
           ProgressEvent.INITIAL_PROGRESS_UPDATE, BuildEventIdUtil.buildFinished());
@@ -83,7 +81,7 @@ public BuildEventStreamProtos.BuildEvent asStreamProto(BuildEventContext convert
     if (id != null) {
       started.setUuid(id);
     }
-    started.setServerPid(ProcessUtils.getpid());
+    started.setServerPid(ProcessHandle.current().pid());
     return GenericBuildEvent.protoChaining(this).setStarted(started.build()).build();
   }
 

src/main/java/com/google/devtools/build/lib/analysis/NoBuildRequestFinishedEvent.java

@@ -20,6 +20,6 @@
 /** {@link BuildEvent} indicating that a request that does not involve building as finished. */
 public final class NoBuildRequestFinishedEvent extends BuildCompletingEvent {
   public NoBuildRequestFinishedEvent(ExitCode exitCode, long finishTimeMillis) {
-    super(exitCode, finishTimeMillis, false);
+    super(exitCode, finishTimeMillis);
   }
 }

src/main/java/com/google/devtools/build/lib/bazel/BUILD

@@ -145,6 +145,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/outputfilter",
         "//src/main/java/com/google/devtools/build/lib/packages/metrics",
         "//src/main/java/com/google/devtools/build/lib/platform:sleep_prevention_module",
+        "//src/main/java/com/google/devtools/build/lib/platform:system_suspension_module",
         "//src/main/java/com/google/devtools/build/lib/profiler/callcounts:callcounts_module",
         "//src/main/java/com/google/devtools/build/lib/profiler/memory:allocationtracker_module",
         "//src/main/java/com/google/devtools/build/lib/remote",

src/main/java/com/google/devtools/build/lib/bazel/Bazel.java

@@ -44,6 +44,7 @@ public final class Bazel {
           com.google.devtools.build.lib.runtime.NoSpawnCacheModule.class,
           com.google.devtools.build.lib.runtime.CommandLogModule.class,
           com.google.devtools.build.lib.platform.SleepPreventionModule.class,
+          com.google.devtools.build.lib.platform.SystemSuspensionModule.class,
           com.google.devtools.build.lib.runtime.BazelFileSystemModule.class,
           com.google.devtools.build.lib.runtime.mobileinstall.MobileInstallModule.class,
           com.google.devtools.build.lib.bazel.BazelWorkspaceStatusModule.class,

src/main/java/com/google/devtools/build/lib/buildeventstream/BuildCompletingEvent.java

@@ -30,24 +30,17 @@ public abstract class BuildCompletingEvent implements BuildEvent {
   private final ExitCode exitCode;
   private final long finishTimeMillis;
 
-  /** Was the build suspended mid-build (e.g. hardware sleep, SIGSTOP). */
-  private final boolean wasSuspended;
-
   private final Collection<BuildEventId> children;
 
   public BuildCompletingEvent(
-      ExitCode exitCode,
-      long finishTimeMillis,
-      Collection<BuildEventId> children,
-      boolean wasSuspended) {
+      ExitCode exitCode, long finishTimeMillis, Collection<BuildEventId> children) {
     this.exitCode = exitCode;
     this.finishTimeMillis = finishTimeMillis;
     this.children = children;
-    this.wasSuspended = wasSuspended;
   }
 
-  public BuildCompletingEvent(ExitCode exitCode, long finishTimeMillis, boolean wasSuspended) {
-    this(exitCode, finishTimeMillis, ImmutableList.of(), wasSuspended);
+  public BuildCompletingEvent(ExitCode exitCode, long finishTimeMillis) {
+    this(exitCode, finishTimeMillis, ImmutableList.of());
   }
 
   public ExitCode getExitCode() {
@@ -72,18 +65,12 @@ public BuildEventStreamProtos.BuildEvent asStreamProto(BuildEventContext convert
             .setCode(exitCode.getNumericExitCode())
             .build();
 
-    BuildEventStreamProtos.BuildFinished.AnomalyReport protoAnamolyReport =
-        BuildEventStreamProtos.BuildFinished.AnomalyReport.newBuilder()
-            .setWasSuspended(wasSuspended)
-            .build();
-
     BuildEventStreamProtos.BuildFinished finished =
         BuildEventStreamProtos.BuildFinished.newBuilder()
             .setOverallSuccess(ExitCode.SUCCESS.equals(exitCode))
             .setExitCode(protoExitCode)
             .setFinishTime(Timestamps.fromMillis(finishTimeMillis))
             .setFinishTimeMillis(finishTimeMillis)
-            .setAnomalyReport(protoAnamolyReport)
             .build();
     return GenericBuildEvent.protoChaining(this).setFinished(finished).build();
   }

src/main/java/com/google/devtools/build/lib/buildeventstream/proto/build_event_stream.proto

@@ -792,6 +792,7 @@ message BuildFinished {
     // Examples of suspensions are SIGSTOP, or the hardware being put to sleep.
     // If was_suspended is true, then most of the timings for this build are
     // suspect.
+    // NOTE: This is no longer set and is deprecated.
     bool was_suspended = 1;
   }
 
@@ -812,7 +813,7 @@ message BuildFinished {
   // End of the build.
   google.protobuf.Timestamp finish_time = 5;
 
-  AnomalyReport anomaly_report = 4;
+  AnomalyReport anomaly_report = 4 [deprecated = true];
 }
 
 message BuildMetrics {

src/main/java/com/google/devtools/build/lib/buildtool/BuildResult.java

@@ -48,8 +48,6 @@ public final class BuildResult {
   private long startTimeMillis = 0; // milliseconds since UNIX epoch.
   private long stopTimeMillis = 0;
 
-  private boolean wasSuspended = false;
-
   private Throwable crash = null;
   private boolean catastrophe = false;
   private boolean stopOnFirstFailure;
@@ -97,16 +95,6 @@ public double getElapsedSeconds() {
     return (stopTimeMillis - startTimeMillis) / 1000.0;
   }
 
-  /** Record if the build was suspended (SIGSTOP or hardware put to sleep). */
-  public void setWasSuspended(boolean wasSuspended) {
-    this.wasSuspended = wasSuspended;
-  }
-
-  /** Whether the build was suspended (SIGSTOP or hardware put to sleep). */
-  public boolean getWasSuspended() {
-    return wasSuspended;
-  }
-
   public void setDetailedExitCode(DetailedExitCode detailedExitCode) {
     this.detailedExitCode = detailedExitCode;
   }

src/main/java/com/google/devtools/build/lib/buildtool/BuildTool.java

@@ -13,8 +13,6 @@
 // limitations under the License.
 package com.google.devtools.build.lib.buildtool;
 
-import static com.google.devtools.build.lib.platform.SuspendCounter.suspendCount;
-
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Throwables;
@@ -438,7 +436,6 @@ public BuildResult processRequest(
       BuildRequest request, TargetValidator validator, PostBuildCallback postBuildCallback) {
     BuildResult result = new BuildResult(request.getStartTime());
     maybeSetStopOnFirstFailure(request, result);
-    int startSuspendCount = suspendCount();
     Throwable crash = null;
     DetailedExitCode detailedExitCode = null;
     try {
@@ -536,7 +533,7 @@ public BuildResult processRequest(
                 new IllegalStateException("Unspecified DetailedExitCode"));
       }
       try (SilentCloseable c = Profiler.instance().profile("stopRequest")) {
-        stopRequest(result, crash, detailedExitCode, startSuspendCount);
+        stopRequest(result, crash, detailedExitCode);
       }
     }
 
@@ -576,16 +573,10 @@ private static boolean needsExecutionPhase(BuildRequestOptions options) {
    * @param crash any unexpected {@link RuntimeException} or {@link Error}, may be null
    * @param detailedExitCode describes the exit code and an optional detailed failure value to add
    *     to {@code result}
-   * @param startSuspendCount number of suspensions before the build started
    */
   public void stopRequest(
-      BuildResult result,
-      @Nullable Throwable crash,
-      DetailedExitCode detailedExitCode,
-      int startSuspendCount) {
+      BuildResult result, @Nullable Throwable crash, DetailedExitCode detailedExitCode) {
     Preconditions.checkState((crash == null) || !detailedExitCode.isSuccess());
-    int stopSuspendCount = suspendCount();
-    Preconditions.checkState(startSuspendCount <= stopSuspendCount);
     result.setUnhandledThrowable(crash);
     result.setDetailedExitCode(detailedExitCode);
 
@@ -598,7 +589,6 @@ public void stopRequest(
     }
     // The stop time has to be captured before we send the BuildCompleteEvent.
     result.setStopTime(runtime.getClock().currentTimeMillis());
-    result.setWasSuspended(stopSuspendCount > startSuspendCount);
 
     // Skip the build complete events so that modules can run blazeShutdownOnCrash without thinking
     // that the build completed normally. BlazeCommandDispatcher will call handleCrash.

src/main/java/com/google/devtools/build/lib/buildtool/buildevent/BuildCompleteEvent.java

@@ -32,11 +32,7 @@ public final class BuildCompleteEvent extends BuildCompletingEvent {
 
   /** Construct the BuildCompleteEvent. */
   public BuildCompleteEvent(BuildResult result, Collection<BuildEventId> children) {
-    super(
-        result.getDetailedExitCode().getExitCode(),
-        result.getStopTime(),
-        children,
-        result.getWasSuspended());
+    super(result.getDetailedExitCode().getExitCode(), result.getStopTime(), children);
     this.result = checkNotNull(result);
   }
 

src/main/java/com/google/devtools/build/lib/buildtool/buildevent/BuildStartingEvent.java

@@ -26,7 +26,6 @@
 import com.google.devtools.build.lib.buildtool.BuildRequest;
 import com.google.devtools.build.lib.runtime.CommandEnvironment;
 import com.google.devtools.build.lib.runtime.CommandLineEvent;
-import com.google.devtools.build.lib.util.ProcessUtils;
 import com.google.protobuf.util.Timestamps;
 import java.util.Collection;
 
@@ -107,7 +106,7 @@ public BuildEventStreamProtos.BuildEvent asStreamProto(BuildEventContext convert
             .setBuildToolVersion(BlazeVersionInfo.instance().getVersion())
             .setOptionsDescription(request.getOptionsDescription())
             .setCommand(request.getCommandName())
-            .setServerPid(ProcessUtils.getpid());
+            .setServerPid(ProcessHandle.current().pid());
     if (pwd != null) {
       started.setWorkingDirectory(pwd);
     }

src/main/java/com/google/devtools/build/lib/buildtool/buildevent/SystemSuspensionEvent.java

@@ -0,0 +1,73 @@
+// Copyright 2021 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.buildtool.buildevent;
+
+import com.google.devtools.build.lib.events.ExtendedEventHandler;
+
+/**
+ * This event is fired from {@link
+ * com.google.devtools.build.lib.platform.SystemSuspensionModule#suspendCallback} to indicate that
+ * the user either suspended the build with a signal or put their computer to sleep.
+ */
+public class SystemSuspensionEvent implements ExtendedEventHandler.Postable {
+
+  /** The possible reasons a system could be suspended. */
+  public enum Reason {
+    SIGTSTP("Signal SIGTSTP"),
+    SIGCONT("Signal SIGCONT"),
+    SLEEP("Computer put to sleep"),
+    WAKE("Computer woken up");
+
+    private final String logString;
+
+    Reason(String logString) {
+      this.logString = logString;
+    }
+
+    public String logString() {
+      return logString;
+    }
+
+    static Reason fromInt(int number) {
+      switch (number) {
+        case 0:
+          return SIGTSTP;
+        case 1:
+          return SIGCONT;
+        case 2:
+          return SLEEP;
+        case 3:
+          return WAKE;
+        default:
+          throw new IllegalStateException("Unknown suspension reason: " + number);
+      }
+    }
+  };
+
+  /** These constants are mapped to enum in third_party/bazel/src/main/native/unix_jni.h. */
+  private final Reason reason;
+
+  public SystemSuspensionEvent(int reason) {
+    this.reason = Reason.fromInt(reason);
+  }
+
+  public Reason getReason() {
+    return reason;
+  }
+
+  public String logString() {
+    return "SystemSuspensionEvent: " + reason.logString();
+  }
+}

src/main/java/com/google/devtools/build/lib/buildtool/buildevent/TestingCompleteEvent.java

@@ -32,13 +32,8 @@ public class TestingCompleteEvent extends BuildCompletingEvent {
    *
    * @param exitCode the overall exit code of "bazel test".
    * @param finishTimeMillis the finish time in milliseconds since the epoch.
-   * @param wasSuspended was the build suspended at any point.
    */
-  public TestingCompleteEvent(ExitCode exitCode, long finishTimeMillis, boolean wasSuspended) {
-    super(
-        exitCode,
-        finishTimeMillis,
-        ImmutableList.of(BuildEventIdUtil.buildToolLogs()),
-        wasSuspended);
+  public TestingCompleteEvent(ExitCode exitCode, long finishTimeMillis) {
+    super(exitCode, finishTimeMillis, ImmutableList.of(BuildEventIdUtil.buildToolLogs()));
   }
 }

src/main/java/com/google/devtools/build/lib/platform/BUILD

@@ -21,12 +21,16 @@ java_library(
 )
 
 java_library(
-    name = "suspend_counter",
+    name = "system_suspension_module",
     srcs = [
-        "SuspendCounter.java",
+        "SystemSuspensionModule.java",
     ],
     deps = [
+        "//src/main/java/com/google/devtools/build/lib:runtime",
+        "//src/main/java/com/google/devtools/build/lib/events",
         "//src/main/java/com/google/devtools/build/lib/jni",
+        "//third_party:flogger",
+        "//third_party:jsr305",
     ],
 )