Expose an actions provider on RuleConfiguredTarget instances.

Given a target (for example from a skylark aspect), one will be able to access a list of actions that the target generated using "target.actions". This is without additional memory footprint.

Actions themselves are not fully exposed to skylark (and thus there isn't much meaning to gather from them in skylark yet). Access methods will follow soon.

RELNOTES: None.
PiperOrigin-RevId: 188098079

src/test/java/com/google/devtools/build/lib/skylark/SkylarkActionProviderTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkActionProviderTest.java b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkActionProviderTest.java
new file mode 100644
index 0000000..0adabd1
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkActionProviderTest.java
@@ -0,0 +1,107 @@
+// Copyright 2018 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.skylark;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Iterables;
+import com.google.devtools.build.lib.actions.ActionAnalysisMetadata;
+import com.google.devtools.build.lib.analysis.BuildView.AnalysisResult;
+import com.google.devtools.build.lib.analysis.ConfiguredAspect;
+import com.google.devtools.build.lib.analysis.util.AnalysisTestCase;
+import com.google.devtools.build.lib.cmdline.Label;
+import com.google.devtools.build.lib.packages.SkylarkProvider.SkylarkKey;
+import com.google.devtools.build.lib.syntax.SkylarkList;
+import java.util.stream.Collectors;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for the Skylark-accessible actions provider on rule configured targets. */
+@RunWith(JUnit4.class)
+public class SkylarkActionProviderTest extends AnalysisTestCase {
+
+  @Test
+  public void aspectGetsActionProviderForNativeRule() throws Exception {
+    scratch.file(
+        "test/aspect.bzl",
+        "foo = provider()",
+        "def _impl(target, ctx):",
+        "   return [foo(actions = target.actions)]",
+        "MyAspect = aspect(implementation=_impl)");
+    scratch.file(
+        "test/BUILD",
+        "genrule(",
+        "   name = 'xxx',",
+        "   cmd = 'echo \"hello\" > $@',",
+        "   outs = ['mygen.out']",
+        ")");
+
+    AnalysisResult analysisResult =
+        update(ImmutableList.of("test/aspect.bzl%MyAspect"), "//test:xxx");
+
+    ConfiguredAspect configuredAspect =
+        Iterables.getOnlyElement(analysisResult.getAspects()).getConfiguredAspect();
+
+    SkylarkKey fooKey = new SkylarkKey(Label.parseAbsolute("//test:aspect.bzl"), "foo");
+
+    assertThat(configuredAspect.get(fooKey).getValue("actions")).isNotNull();
+    @SuppressWarnings("unchecked")
+    SkylarkList<ActionAnalysisMetadata> actions =
+        (SkylarkList<ActionAnalysisMetadata>) configuredAspect.get(fooKey).getValue("actions");
+    assertThat(actions).isNotEmpty();
+
+    ActionAnalysisMetadata action = actions.get(0);
+    assertThat(action.getMnemonic()).isEqualTo("Genrule");
+  }
+
+  @Test
+  public void aspectGetsActionProviderForSkylarkRule() throws Exception {
+    scratch.file(
+        "test/aspect.bzl",
+        "foo = provider()",
+        "def _impl(target, ctx):",
+        "   return [foo(actions = target.actions)]",
+        "MyAspect = aspect(implementation=_impl)");
+    scratch.file(
+        "test/rule.bzl",
+        "def impl(ctx):",
+        "  output_file0 = ctx.new_file('myfile0')",
+        "  output_file1 = ctx.new_file('myfile1')",
+        "  ctx.action(outputs=[output_file0], command='fakecmd0', mnemonic='MyAction0')",
+        "  ctx.action(outputs=[output_file1], command='fakecmd1', mnemonic='MyAction1')",
+        "  return None",
+        "my_rule = rule(impl)");
+    scratch.file(
+        "test/BUILD", "load('//test:rule.bzl', 'my_rule')", "my_rule(", "   name = 'xxx',", ")");
+
+    AnalysisResult analysisResult =
+        update(ImmutableList.of("test/aspect.bzl%MyAspect"), "//test:xxx");
+
+    ConfiguredAspect configuredAspect =
+        Iterables.getOnlyElement(analysisResult.getAspects()).getConfiguredAspect();
+
+    SkylarkKey fooKey = new SkylarkKey(Label.parseAbsolute("//test:aspect.bzl"), "foo");
+
+    assertThat(configuredAspect.get(fooKey).getValue("actions")).isNotNull();
+    @SuppressWarnings("unchecked")
+    SkylarkList<ActionAnalysisMetadata> actions =
+        (SkylarkList<ActionAnalysisMetadata>) configuredAspect.get(fooKey).getValue("actions");
+    assertThat(actions).hasSize(2);
+
+    assertThat(actions.stream().map(action -> action.getMnemonic()).collect(Collectors.toList()))
+        .containsExactly("MyAction0", "MyAction1");
+  }
+}