// 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.exec;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.ArtifactRoot;
import com.google.devtools.build.lib.actions.MetadataProvider;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.actions.SpawnResult;
import com.google.devtools.build.lib.actions.SpawnResult.Status;
import com.google.devtools.build.lib.exec.Protos.Digest;
import com.google.devtools.build.lib.exec.Protos.EnvironmentVariable;
import com.google.devtools.build.lib.exec.Protos.File;
import com.google.devtools.build.lib.exec.Protos.SpawnExec;
import com.google.devtools.build.lib.exec.SpawnCache.CacheHandle;
import com.google.devtools.build.lib.exec.SpawnRunner.SpawnExecutionContext;
import com.google.devtools.build.lib.exec.util.SpawnBuilder;
import com.google.devtools.build.lib.testutil.Scratch;
import com.google.devtools.build.lib.testutil.Suite;
import com.google.devtools.build.lib.testutil.TestSpec;
import com.google.devtools.build.lib.util.io.MessageOutputStream;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.Root;
import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

/** Tests for {@link BlazeExecutor}. */
@RunWith(JUnit4.class)
@TestSpec(size = Suite.SMALL_TESTS)
public class AbstractSpawnStrategyTest {
  private static class TestedSpawnStrategy extends AbstractSpawnStrategy {
    public TestedSpawnStrategy(Path execRoot, SpawnRunner spawnRunner) {
      super(execRoot, spawnRunner);
    }
  }

  private static final Spawn SIMPLE_SPAWN =
      new SpawnBuilder("/bin/echo", "Hi!").withEnvironment("VARIABLE", "value").build();

  private final FileSystem fs = new InMemoryFileSystem();
  private final Path execRoot = fs.getPath("/execroot");
  private Scratch scratch;
  private ArtifactRoot rootDir;
  @Mock private SpawnRunner spawnRunner;
  @Mock private ActionExecutionContext actionExecutionContext;
  @Mock private MessageOutputStream messageOutput;

  @Before
  public final void setUp() throws Exception {
    MockitoAnnotations.initMocks(this);
    scratch = new Scratch(fs);
    rootDir = ArtifactRoot.asSourceRoot(Root.fromPath(scratch.dir("/execroot")));
  }

  @Test
  public void testZeroExit() throws Exception {
    when(actionExecutionContext.getContext(eq(SpawnCache.class))).thenReturn(SpawnCache.NO_CACHE);
    when(actionExecutionContext.getExecRoot()).thenReturn(execRoot);
    SpawnResult spawnResult =
        new SpawnResult.Builder().setStatus(Status.SUCCESS).setRunnerName("test").build();
    when(spawnRunner.exec(any(Spawn.class), any(SpawnExecutionContext.class)))
        .thenReturn(spawnResult);

    List<SpawnResult> spawnResults =
        new TestedSpawnStrategy(execRoot, spawnRunner).exec(SIMPLE_SPAWN, actionExecutionContext);

    assertThat(spawnResults).containsExactly(spawnResult);

    // Must only be called exactly once.
    verify(spawnRunner).exec(any(Spawn.class), any(SpawnExecutionContext.class));
  }

  @Test
  public void testNonZeroExit() throws Exception {
    when(actionExecutionContext.getContext(eq(SpawnCache.class))).thenReturn(SpawnCache.NO_CACHE);
    when(actionExecutionContext.getExecRoot()).thenReturn(execRoot);
    SpawnResult result =
        new SpawnResult.Builder()
            .setStatus(Status.NON_ZERO_EXIT)
            .setExitCode(1)
            .setRunnerName("test")
            .build();
    when(spawnRunner.exec(any(Spawn.class), any(SpawnExecutionContext.class))).thenReturn(result);

    try {
      // Ignoring the List<SpawnResult> return value.
      new TestedSpawnStrategy(execRoot, spawnRunner).exec(SIMPLE_SPAWN, actionExecutionContext);
      fail("Expected SpawnExecException");
    } catch (SpawnExecException e) {
      assertThat(e.getSpawnResult()).isSameAs(result);
    }
    // Must only be called exactly once.
    verify(spawnRunner).exec(any(Spawn.class), any(SpawnExecutionContext.class));
  }

  @Test
  public void testCacheHit() throws Exception {
    SpawnCache cache = mock(SpawnCache.class);
    SpawnResult spawnResult =
        new SpawnResult.Builder().setStatus(Status.SUCCESS).setRunnerName("test").build();
    when(cache.lookup(any(Spawn.class), any(SpawnExecutionContext.class)))
        .thenReturn(SpawnCache.success(spawnResult));
    when(actionExecutionContext.getContext(eq(SpawnCache.class))).thenReturn(cache);
    when(actionExecutionContext.getExecRoot()).thenReturn(execRoot);

    List<SpawnResult> spawnResults =
        new TestedSpawnStrategy(execRoot, spawnRunner).exec(SIMPLE_SPAWN, actionExecutionContext);
    assertThat(spawnResults).containsExactly(spawnResult);
    verify(spawnRunner, never()).exec(any(Spawn.class), any(SpawnExecutionContext.class));
  }

  @SuppressWarnings("unchecked")
  @Test
  public void testCacheMiss() throws Exception {
    SpawnCache cache = mock(SpawnCache.class);
    CacheHandle entry = mock(CacheHandle.class);
    when(cache.lookup(any(Spawn.class), any(SpawnExecutionContext.class))).thenReturn(entry);
    when(entry.hasResult()).thenReturn(false);
    when(entry.willStore()).thenReturn(true);

    when(actionExecutionContext.getContext(eq(SpawnCache.class))).thenReturn(cache);
    when(actionExecutionContext.getExecRoot()).thenReturn(execRoot);
    SpawnResult spawnResult =
        new SpawnResult.Builder().setStatus(Status.SUCCESS).setRunnerName("test").build();
    when(spawnRunner.exec(any(Spawn.class), any(SpawnExecutionContext.class)))
        .thenReturn(spawnResult);

    List<SpawnResult> spawnResults =
        new TestedSpawnStrategy(execRoot, spawnRunner).exec(SIMPLE_SPAWN, actionExecutionContext);

    assertThat(spawnResults).containsExactly(spawnResult);

    // Must only be called exactly once.
    verify(spawnRunner).exec(any(Spawn.class), any(SpawnExecutionContext.class));
    verify(entry).store(eq(spawnResult));
  }

  @SuppressWarnings("unchecked")
  @Test
  public void testCacheMissWithNonZeroExit() throws Exception {
    SpawnCache cache = mock(SpawnCache.class);
    CacheHandle entry = mock(CacheHandle.class);
    when(cache.lookup(any(Spawn.class), any(SpawnExecutionContext.class))).thenReturn(entry);
    when(entry.hasResult()).thenReturn(false);
    when(entry.willStore()).thenReturn(true);

    when(actionExecutionContext.getContext(eq(SpawnCache.class))).thenReturn(cache);
    when(actionExecutionContext.getExecRoot()).thenReturn(execRoot);
    SpawnResult result =
        new SpawnResult.Builder()
            .setStatus(Status.NON_ZERO_EXIT)
            .setExitCode(1)
            .setRunnerName("test")
            .build();
    when(spawnRunner.exec(any(Spawn.class), any(SpawnExecutionContext.class))).thenReturn(result);

    try {
      // Ignoring the List<SpawnResult> return value.
      new TestedSpawnStrategy(execRoot, spawnRunner).exec(SIMPLE_SPAWN, actionExecutionContext);
      fail("Expected SpawnExecException");
    } catch (SpawnExecException e) {
      assertThat(e.getSpawnResult()).isSameAs(result);
    }
    // Must only be called exactly once.
    verify(spawnRunner).exec(any(Spawn.class), any(SpawnExecutionContext.class));
    verify(entry).store(eq(result));
  }

  @Test
  public void testLogSpawn() throws Exception {
    when(actionExecutionContext.getContext(eq(SpawnCache.class))).thenReturn(SpawnCache.NO_CACHE);
    when(actionExecutionContext.getExecRoot()).thenReturn(execRoot);
    when(actionExecutionContext.getContext(eq(SpawnLogContext.class)))
        .thenReturn(new SpawnLogContext(execRoot, messageOutput));
    when(spawnRunner.exec(any(Spawn.class), any(SpawnExecutionContext.class)))
        .thenReturn(
            new SpawnResult.Builder()
                .setStatus(Status.NON_ZERO_EXIT)
                .setExitCode(23)
                .setRunnerName("runner")
                .build());
    when(actionExecutionContext.getMetadataProvider()).thenReturn(mock(MetadataProvider.class));

    Artifact input = new Artifact(scratch.file("/execroot/foo", "1"), rootDir);
    scratch.file("/execroot/out1", "123");
    scratch.file("/execroot/out2", "123");
    Spawn spawn =
        new SpawnBuilder("/bin/echo", "Foo!")
            .withEnvironment("FOO", "v1")
            .withEnvironment("BAR", "v2")
            .withMnemonic("MyMnemonic")
            .withProgressMessage("my progress message")
            .withInput(input)
            .withOutputs("out2", "out1")
            .build();
    try {
      new TestedSpawnStrategy(execRoot, spawnRunner).exec(spawn, actionExecutionContext);
      fail("expected failure");
    } catch (SpawnExecException expected) {
      // Should throw.
    }

    SpawnExec expectedSpawnLog =
        SpawnExec.newBuilder()
            .addCommandArgs("/bin/echo")
            .addCommandArgs("Foo!")
            .addEnvironmentVariables(
                EnvironmentVariable.newBuilder().setName("BAR").setValue("v2").build())
            .addEnvironmentVariables(
                EnvironmentVariable.newBuilder().setName("FOO").setValue("v1").build())
            .addInputs(
                File.newBuilder()
                    .setPath("foo")
                    .setDigest(
                        Digest.newBuilder()
                            .setHash("b026324c6904b2a9cb4b88d6d61c81d1")
                            .setSizeBytes(2)
                            .setHashFunctionName("MD5")
                            .build())
                    .build())
            .addListedOutputs("out1")
            .addListedOutputs("out2")
            .addActualOutputs(
                File.newBuilder()
                    .setPath("out1")
                    .setDigest(
                        Digest.newBuilder()
                            .setHash("ba1f2511fc30423bdbb183fe33f3dd0f")
                            .setSizeBytes(4)
                            .setHashFunctionName("MD5")
                            .build())
                    .build())
            .addActualOutputs(
                File.newBuilder()
                    .setPath("out2")
                    .setDigest(
                        Digest.newBuilder()
                            .setHash("ba1f2511fc30423bdbb183fe33f3dd0f")
                            .setSizeBytes(4)
                            .setHashFunctionName("MD5")
                            .build())
                    .build())
            .setStatus("NON_ZERO_EXIT")
            .setExitCode(23)
            .setRemotable(true)
            .setCacheable(true)
            .setProgressMessage("my progress message")
            .setMnemonic("MyMnemonic")
            .setRunner("runner")
            .build();
    verify(messageOutput).write(expectedSpawnLog);
  }
}