// Copyright 2014 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 com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.ActionExecutionContext.ShowSubcommands;
import com.google.devtools.build.lib.actions.LocalHostCapacity;
import com.google.devtools.build.lib.actions.ResourceSet;
import com.google.devtools.build.lib.analysis.config.PerLabelOptions;
import com.google.devtools.build.lib.util.OptionsUtils;
import com.google.devtools.build.lib.util.RegexFilter;
import com.google.devtools.build.lib.util.ResourceConverter;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.common.options.BoolOrEnumConverter;
import com.google.devtools.common.options.Converters.AssignmentConverter;
import com.google.devtools.common.options.Option;
import com.google.devtools.common.options.OptionDocumentationCategory;
import com.google.devtools.common.options.OptionEffectTag;
import com.google.devtools.common.options.Options;
import com.google.devtools.common.options.OptionsBase;
import com.google.devtools.common.options.OptionsParsingException;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * Options affecting the execution phase of a build.
 *
 * These options are interpreted by the BuildTool to choose an Executor to
 * be used for the build.
 *
 * Note: from the user's point of view, the characteristic function of this
 * set of options is indistinguishable from that of the BuildRequestOptions:
 * they are all per-request.  The difference is only apparent in the
 * implementation: these options are used only by the lib.exec machinery, which
 * affects how C++ and Java compilation occur.  (The BuildRequestOptions
 * contain a mixture of "semantic" options affecting the choice of targets to
 * build, and "non-semantic" options affecting the lib.actions machinery.)
 * Ideally, the user would be unaware of the difference.  For now, the usage
 * strings are identical modulo "part 1", "part 2".
 */
public class ExecutionOptions extends OptionsBase {

  public static final ExecutionOptions DEFAULTS = Options.getDefaults(ExecutionOptions.class);

  @Option(
      name = "spawn_strategy",
      defaultValue = "",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify how spawn actions are executed by default. "
              + "'standalone' means run all of them locally without any kind of sandboxing. "
              + "'sandboxed' means to run them in a sandboxed environment with limited privileges "
              + "(details depend on platform support).")
  public String spawnStrategy;

  @Option(
      name = "genrule_strategy",
      defaultValue = "",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify how to execute genrules. This flag will be phased out. Instead, use "
              + "--spawn_strategy=<value> to control all actions or --strategy=Genrule=<value> "
              + "to control genrules only.")
  public String genruleStrategy;

  @Option(
      name = "strategy",
      allowMultiple = true,
      converter = AssignmentConverter.class,
      defaultValue = "",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify how to distribute compilation of other spawn actions. "
              + "Example: 'Javac=local' means to spawn Java compilation locally. "
              + "'JavaIjar=sandboxed' means to spawn Java Ijar actions in a sandbox. ")
  public List<Map.Entry<String, String>> strategy;

  @Option(
      name = "strategy_regexp",
      allowMultiple = true,
      converter = RegexFilterAssignmentConverter.class,
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      defaultValue = "",
      help =
          "Override which spawn strategy should be used to execute spawn actions that have "
              + "descriptions matching a certain regex_filter. See --per_file_copt for details on"
              + "regex_filter matching. "
              + "The first regex_filter that matches the description is used. "
              + "This option overrides other flags for specifying strategy. "
              + "Example: --strategy_regexp=//foo.*\\.cc,-//foo/bar=local means to run actions "
              + "using local strategy if their descriptions match //foo.*.cc but not //foo/bar. "
              + "Example: --strategy_regexp='Compiling.*/bar=local "
              + " --strategy_regexp=Compiling=sandboxed will run 'Compiling //foo/bar/baz' with "
              + "the 'local' strategy, but reversing the order would run it with 'sandboxed'. ")
  public List<Map.Entry<RegexFilter, String>> strategyByRegexp;

  @Option(
      name = "materialize_param_files",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Writes intermediate parameter files to output tree even when using "
              + "remote action execution. Useful when debugging actions. ")
  public boolean materializeParamFiles;

  @Option(
    name = "verbose_failures",
    defaultValue = "false",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help = "If a command fails, print out the full command line."
  )
  public boolean verboseFailures;

  @Option(
    name = "subcommands",
    abbrev = 's',
    defaultValue = "false",
    converter = ShowSubcommandsConverter.class,
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help = "Display the subcommands executed during a build."
  )
  public ShowSubcommands showSubcommands;

  @Option(
    name = "check_up_to_date",
    defaultValue = "false",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "Don't perform the build, just check if it is up-to-date.  If all targets are "
            + "up-to-date, the build completes successfully.  If any step needs to be executed "
            + "an error is reported and the build fails."
  )
  public boolean checkUpToDate;

  @Option(
    name = "check_tests_up_to_date",
    defaultValue = "false",
    implicitRequirements = {"--check_up_to_date"},
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "Don't run tests, just check if they are up-to-date.  If all tests results are "
            + "up-to-date, the testing completes successfully.  If any test needs to be built or "
            + "executed, an error is reported and the testing fails.  This option implies "
            + "--check_up_to_date behavior."
  )
  public boolean testCheckUpToDate;

  @Option(
    name = "test_strategy",
    defaultValue = "",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help = "Specifies which strategy to use when running tests."
  )
  public String testStrategy;

  @Option(
    name = "test_keep_going",
    defaultValue = "true",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "When disabled, any non-passing test will cause the entire build to stop. By default "
            + "all tests are run, even if some do not pass."
  )
  public boolean testKeepGoing;

  @Option(
    name = "runs_per_test_detects_flakes",
    defaultValue = "false",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "If true, any shard in which at least one run/attempt passes and at least one "
            + "run/attempt fails gets a FLAKY status."
  )
  public boolean runsPerTestDetectsFlakes;

  @Option(
    name = "flaky_test_attempts",
    allowMultiple = true,
    defaultValue = "default",
    converter = TestAttemptsConverter.class,
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "Each test will be retried up to the specified number of times in case of any test "
            + "failure. Tests that required more than one attempt to pass would be marked as "
            + "'FLAKY' in the test summary. If this option is set, it should specify an int N or "
            + "the string 'default'. If it's an int, then all tests will be run up to N times. "
            + "If it is not specified or its value is 'default', then only a single test attempt "
            + "will be made for regular tests and three for tests marked explicitly as flaky by "
            + "their rule (flaky=1 attribute)."
  )
  public List<PerLabelOptions> testAttempts;

  @Option(
      name = "test_tmpdir",
      defaultValue = "null",
      converter = OptionsUtils.PathFragmentConverter.class,
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Specifies the base temporary directory for 'bazel test' to use.")
  public PathFragment testTmpDir;

  @Option(
    name = "test_output",
    defaultValue = "summary",
    converter = TestStrategy.TestOutputFormat.Converter.class,
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "Specifies desired output mode. Valid values are 'summary' to output only test status "
            + "summary, 'errors' to also print test logs for failed tests, 'all' to print logs "
            + "for all tests and 'streamed' to output logs for all tests in real time "
            + "(this will force tests to be executed locally one at a time regardless of "
            + "--test_strategy value)."
  )
  public TestStrategy.TestOutputFormat testOutput;

  @Option(
    name = "test_summary",
    defaultValue = "short",
    converter = TestStrategy.TestSummaryFormat.Converter.class,
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "Specifies the desired format ot the test summary. Valid values are 'short' to print "
            + "information only about tests executed, 'terse', to print information only about "
            + "unsuccessful tests that were run, 'detailed' to print detailed information about "
            + "failed test cases, and 'none' to omit the summary."
  )
  public TestStrategy.TestSummaryFormat testSummary;

  @Option(
    name = "resource_autosense",
    defaultValue = "false",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help = "This flag has no effect, and is deprecated"
  )
  public boolean useResourceAutoSense;

  @Option(
      name = "ram_utilization_factor",
      defaultValue = "0",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify what percentage of the system's RAM Bazel should try to use for its "
              + "subprocesses. This option affects how many processes Bazel will try to run in "
              + "parallel. If you run several Bazel builds in parallel, using a lower value for "
              + "this option may avoid thrashing and thus improve overall throughput. "
              + "Using a value higher than 67 is NOT recommended. "
              + "Note that Blaze's estimates are very coarse, so the actual RAM usage may be much "
              + "higher or much lower than specified. "
              + "Note also that this option does not affect the amount of memory that the Bazel "
              + "server itself will use. "
              + "Setting this value overrides --local_ram_resources")
  public int ramUtilizationPercentage;

  @Option(
      name = "local_resources",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Explicitly set amount of local resources available to Blaze. By default, Bazel will "
              + "query system configuration to estimate amount of RAM (in MB) "
              + "and number of CPU cores available for the locally executed build actions. It "
              + "would also assume default I/O capabilities of the local workstation (1.0). This "
              + "options allows to explicitly set all 3 values. Note, that if this option is used, "
              + "Bazel will ignore --ram_utilization_factor, --local_cpu_resources, and "
              + "--local_ram_resources.",
      converter = ResourceSet.ResourceSetConverter.class)
  public ResourceSet availableResources;

  @Option(
      name = "local_cpu_resources",
      defaultValue = "HOST_CPUS",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Explicitly set the number of local CPU threads available to Bazel. Takes "
              + "an integer, or \"HOST_CPUS\", optionally followed by [-|*]<float> "
              + "(eg. HOST_CPUS*.5 to use half the available CPU cores)."
              + "By default, (\"HOST_CPUS\"), Bazel will query system configuration to estimate "
              + "number of CPU cores available for the locally executed build actions. "
              + "Note: This is a no-op if --local_resources is set.",
      converter = CpuResourceConverter.class)
  public float localCpuResources;

  @Option(
      name = "local_ram_resources",
      defaultValue = "HOST_RAM*.67",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Explicitly set the amount of local host RAM (in MB) available to Bazel. Takes "
              + "an integer, or \"HOST_RAM\", optionally followed by [-|*]<float> "
              + "(eg. HOST_RAM*.5 to use half the available RAM)."
              + "By default, (\"HOST_RAM*.67\"), Bazel will query system configuration to estimate "
              + "amount of RAM available for the locally executed build actions and will use 67% "
              + "of available RAM. "
              + "Note: This is a no-op if --ram_utilization_factor or --local_resources is set.",
      converter = RamResourceConverter.class)
  public float localRamResources;

  @Option(
    name = "experimental_local_memory_estimate",
    defaultValue = "false",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "Estimate the actual memory available online. "
            + "By default, Blaze assumes most actions use a fixed amount of memory, and counts "
            + "that against the total available system memory, regardless of how much memory is "
            + "actually available.  This option enables online estimation of how much memory is "
            + "available at any given time, and thus does not require accurate estimation of how "
            + "much memory a given action will take."
  )
  public boolean localMemoryEstimate;

  @Option(
      name = "local_test_jobs",
      defaultValue = "auto",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "The max number of local test jobs to run concurrently. "
              + "Takes "
              + ResourceConverter.FLAG_SYNTAX
              + ". 0 means local resources will limit the number of local test jobs to run "
              + "concurrently instead. Setting this greater than the value for --jobs "
              + "is ineffectual.",
      converter = LocalTestJobsConverter.class)
  public int localTestJobs;

  public boolean usingLocalTestJobs() {
    return localTestJobs != 0;
  }

  @Option(
    name = "debug_print_action_contexts",
    defaultValue = "false",
    documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help = "Print the contents of the SpawnActionContext and ContextProviders maps."
  )
  public boolean debugPrintActionContexts;

  @Option(
      name = "cache_computed_file_digests",
      defaultValue = "50000",
      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "If greater than 0, configures Bazel to cache file digests in memory based on their "
              + "metadata instead of recomputing the digests from disk every time they are needed. "
              + "Setting this to 0 ensures correctness because not all file changes can be noted "
              + "from file metadata. When not 0, the number indicates the size of the cache as the "
              + "number of file digests to be cached.")
  public long cacheSizeForComputedFileDigests;

  @Option(
    name = "experimental_enable_critical_path_profiling",
    defaultValue = "true",
    documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help =
        "If set (the default), critical path profiling is enabled for the execution phase. "
            + "This has a slight overhead in RAM and CPU, and may prevent Bazel from making certain"
            + " aggressive RAM optimizations in some cases."
  )
  public boolean enableCriticalPathProfiling;

  @Option(
      name = "experimental_stats_summary",
      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
      effectTags = {OptionEffectTag.TERMINAL_OUTPUT},
      defaultValue = "false",
      help = "Enable a modernized summary of the build stats."
  )
  public boolean statsSummary;

  @Option(
    name = "experimental_execution_log_file",
    defaultValue = "",
    category = "verbosity",
    documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
    effectTags = {OptionEffectTag.UNKNOWN},
    help = "Log the executed spawns into this file as delimited Spawn protos."
  )
  public String executionLogFile;

  @Option(
      name = "experimental_split_xml_generation",
      defaultValue = "true",
      documentationCategory = OptionDocumentationCategory.EXECUTION_STRATEGY,
      effectTags = {OptionEffectTag.EXECUTION},
      help =
          "If this flag is set, and a test action does not generate a test.xml file, then "
              + "Bazel uses a separate action to generate a dummy test.xml file containing the "
              + "test log. Otherwise, Bazel generates a test.xml as part of the test action.")
  public boolean splitXmlGeneration;

  /** Converter for the --flaky_test_attempts option. */
  public static class TestAttemptsConverter extends PerLabelOptions.PerLabelOptionsConverter {
    private static final int MIN_VALUE = 1;
    private static final int MAX_VALUE = 10;

    private void validateInput(String input) throws OptionsParsingException {
      if ("default".equals(input)) {
        return;
      } else {
        Integer value = Integer.parseInt(input);
        if (value < MIN_VALUE) {
          throw new OptionsParsingException("'" + input + "' should be >= " + MIN_VALUE);
        } else if (value < MIN_VALUE || value > MAX_VALUE) {
          throw new OptionsParsingException("'" + input + "' should be <= " + MAX_VALUE);
        }
        return;
      }
    }

    @Override
    public PerLabelOptions convert(String input) throws OptionsParsingException {
      try {
        return parseAsInteger(input);
      } catch (NumberFormatException ignored) {
        return parseAsRegex(input);
      }
    }

    private PerLabelOptions parseAsInteger(String input)
        throws NumberFormatException, OptionsParsingException {
      validateInput(input);
      RegexFilter catchAll =
          new RegexFilter(Collections.singletonList(".*"), Collections.<String>emptyList());
      return new PerLabelOptions(catchAll, Collections.singletonList(input));
    }

    private PerLabelOptions parseAsRegex(String input) throws OptionsParsingException {
      PerLabelOptions testRegexps = super.convert(input);
      if (testRegexps.getOptions().size() != 1) {
        throw new OptionsParsingException("'" + input + "' has multiple runs for a single pattern");
      }
      String runsPerTest = Iterables.getOnlyElement(testRegexps.getOptions());
      try {
        // Run this in order to catch errors.
        validateInput(runsPerTest);
      } catch (NumberFormatException e) {
        throw new OptionsParsingException("'" + input + "' has a non-numeric value", e);
      }
      return testRegexps;
    }

    @Override
    public String getTypeDescription() {
      return "a positive integer, the string \"default\", or test_regex@attempts. "
          + "This flag may be passed more than once";
    }
  }

  /** Converter for --local_test_jobs, which takes {@value FLAG_SYNTAX} */
  public static class LocalTestJobsConverter extends ResourceConverter {
    public LocalTestJobsConverter() throws OptionsParsingException {
      super(/* autoSupplier= */ () -> 0, /* minValue= */ 0, /* maxValue= */ Integer.MAX_VALUE);
    }
  }

  /** Converter for --subcommands */
  public static class ShowSubcommandsConverter extends BoolOrEnumConverter<ShowSubcommands> {
    public ShowSubcommandsConverter() {
      super(
          ShowSubcommands.class, "subcommand option", ShowSubcommands.TRUE, ShowSubcommands.FALSE);
    }
  }

  /**
   * Converter for --local_cpu_resources, which takes an integer greater than or equal to 1, or
   * "HOST_CPUS", optionally followed by [-|*]<float>.
   */
  public static class CpuResourceConverter extends ResourceConverter {
    public CpuResourceConverter() {
      super(
          ImmutableMap.of(
              "HOST_CPUS",
              () -> (int) Math.ceil(LocalHostCapacity.getLocalHostCapacity().getCpuUsage())),
          1,
          Integer.MAX_VALUE);
    }

    @Override
    public String getTypeDescription() {
      return "an integer, or \"HOST_CPUS\", optionally followed by [-|*]<float>.";
    }
  }

  /**
   * Converter for --local_cpu_resources, which takes an integer greater than or equal to 1, or
   * "HOST_RAM", optionally followed by [-|*]<float>.
   */
  public static class RamResourceConverter extends ResourceConverter {
    public RamResourceConverter() {
      super(
          ImmutableMap.of(
              "HOST_RAM",
              // Some tests seem to set local host RAM to 0, so we adjust host RAM to 1 here
              // to make sure the default is valid.
              () ->
                  Math.max(
                      1, (int) Math.ceil(LocalHostCapacity.getLocalHostCapacity().getMemoryMb()))),
          1,
          Integer.MAX_VALUE);
    }

    @Override
    public String getTypeDescription() {
      return "an integer, or \"HOST_RAM\", optionally followed by [-|*]<float>.";
    }
  }
}