Make ProcessWrapperUtil aware of the execution statistics file, and add new ExecutionStatisticsProvider.

RELNOTES: None.
PiperOrigin-RevId: 178056182

2 files changed, 71 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/shell/BUILD b/src/main/java/com/google/devtools/build/lib/shell/BUILD
index 2432831365..8b8d9301a5 100644
--- a/src/main/java/com/google/devtools/build/lib/shell/BUILD
+++ b/src/main/java/com/google/devtools/build/lib/shell/BUILD
@@ -14,6 +14,7 @@ java_library(
     name = "shell",
     srcs = glob(["*.java"]),
     deps = [
+        "//src/main/protobuf:execution_statistics_java_proto",
         "//third_party:auto_value",
         "//third_party:guava",
     ],
@@ -25,7 +26,10 @@ load("//tools/build_rules:java_rules_skylark.bzl", "bootstrap_java_library")
 
 bootstrap_java_library(
     name = "shell-skylark",
-    srcs = glob(["*.java"]),
+    srcs = glob(
+        ["*.java"],
+        exclude = ["ExecutionStatistics.java"],
+    ),
     jars = [
         "//third_party:auto_value-jars",
         "//third_party:bootstrap_guava_and_error_prone-jars",
diff --git a/src/main/java/com/google/devtools/build/lib/shell/ExecutionStatistics.java b/src/main/java/com/google/devtools/build/lib/shell/ExecutionStatistics.java
new file mode 100644
index 0000000000..f1972ac847
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/shell/ExecutionStatistics.java
@@ -0,0 +1,66 @@
+// Copyright 2017 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.shell;
+
+import java.io.BufferedInputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.time.Duration;
+import java.util.Optional;
+
+/** Provides execution statistics (e.g. resource usage) for external commands. */
+public final class ExecutionStatistics {
+  private final com.google.devtools.build.lib.shell.Protos.ExecutionStatistics
+      executionStatisticsProto;
+
+  /**
+   * Provides execution statistics based on a {@code execution_statistics.proto} file.
+   *
+   * @param executionStatisticsProtoPath path to a materialized ExecutionStatistics proto
+   */
+  public ExecutionStatistics(String executionStatisticsProtoPath) throws IOException {
+    try (InputStream protoInputStream =
+        new BufferedInputStream(new FileInputStream(executionStatisticsProtoPath))) {
+      executionStatisticsProto =
+          com.google.devtools.build.lib.shell.Protos.ExecutionStatistics.parseFrom(
+              protoInputStream);
+    }
+  }
+
+  /** Returns the user time for command execution, if available. */
+  public Optional<Duration> getUserExecutionTime() {
+    if (executionStatisticsProto.hasResourceUsage()) {
+      return Optional.of(
+          Duration.ofSeconds(
+              executionStatisticsProto.getResourceUsage().getUtimeSec(),
+              executionStatisticsProto.getResourceUsage().getUtimeUsec() * 1000));
+    } else {
+      return Optional.empty();
+    }
+  }
+
+  /** Returns the system time for command execution, if available. */
+  public Optional<Duration> getSystemExecutionTime() {
+    if (executionStatisticsProto.hasResourceUsage()) {
+      return Optional.of(
+          Duration.ofSeconds(
+              executionStatisticsProto.getResourceUsage().getStimeSec(),
+              executionStatisticsProto.getResourceUsage().getStimeUsec() * 1000));
+    } else {
+      return Optional.empty();
+    }
+  }
+}