// Copyright 2016 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.remote.options;

import build.bazel.remote.execution.v2.Platform;
import build.bazel.remote.execution.v2.Platform.Property;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableSortedMap;
import com.google.devtools.build.lib.actions.UserExecException;
import com.google.devtools.build.lib.server.FailureDetails.FailureDetail;
import com.google.devtools.build.lib.server.FailureDetails.RemoteExecution;
import com.google.devtools.build.lib.server.FailureDetails.RemoteExecution.Code;
import com.google.devtools.build.lib.util.OptionsUtils;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.common.options.Converter;
import com.google.devtools.common.options.Converters;
import com.google.devtools.common.options.Converters.AssignmentConverter;
import com.google.devtools.common.options.EnumConverter;
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.OptionMetadataTag;
import com.google.devtools.common.options.OptionsBase;
import com.google.devtools.common.options.OptionsParsingException;
import com.google.protobuf.TextFormat;
import com.google.protobuf.TextFormat.ParseException;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.SortedMap;
import java.util.regex.Pattern;

/** Options for remote execution and distributed caching. */
public final class RemoteOptions extends OptionsBase {

  @Option(
      name = "remote_proxy",
      oldName = "remote_cache_proxy",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Connect to the remote cache through a proxy. Currently this flag can only be used to "
              + "configure a Unix domain socket (unix:/path/to/socket).")
  public String remoteProxy;

  @Option(
      name = "remote_max_connections",
      defaultValue = "100",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.HOST_MACHINE_RESOURCE_OPTIMIZATIONS},
      help =
          "The max. number of concurrent network connections to the remote cache/executor. By "
              + "default Bazel limits the number of TCP connections to 100. Setting this flag to "
              + "0 will make Bazel choose the number of connections automatically.")
  public int remoteMaxConnections;

  @Option(
      name = "remote_executor",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "HOST or HOST:PORT of a remote execution endpoint. The supported schemas are grpc, "
              + "grpcs (grpc with TLS enabled) and unix (local UNIX sockets). If no schema is "
              + "provided Bazel will default to grpcs. Specify grpc:// or unix: schema to "
              + "disable TLS.")
  public String remoteExecutor;

  @Option(
      name = "experimental_remote_execution_keepalive",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Whether to use keepalive for remote execution calls.")
  public boolean remoteExecutionKeepalive;

  @Option(
      name = "remote_cache",
      oldName = "remote_http_cache",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "A URI of a caching endpoint. The supported schemas are http, https, grpc, grpcs "
              + "(grpc with TLS enabled) and unix (local UNIX sockets). If no schema is provided "
              + "Bazel will default to grpcs. Specify grpc://, http:// or unix: schema to disable "
              + "TLS. See https://docs.bazel.build/versions/master/remote-caching.html")
  public String remoteCache;

  @Option(
      name = "experimental_remote_downloader",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "A Remote Asset API endpoint URI, to be used as a remote download proxy. The supported"
              + " schemas are grpc, grpcs (grpc with TLS enabled) and unix (local UNIX sockets)."
              + " If no schema is provided Bazel will default to grpcs. See: "
              + "https://github.com/bazelbuild/remote-apis/blob/master/build/bazel/remote/asset/v1/remote_asset.proto")
  public String remoteDownloader;

  @Option(
      name = "remote_header",
      converter = Converters.AssignmentConverter.class,
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify a header that will be included in requests: --remote_header=Name=Value. "
              + "Multiple headers can be passed by specifying the flag multiple times. Multiple "
              + "values for the same name will be converted to a comma-separated list.",
      allowMultiple = true)
  public List<Entry<String, String>> remoteHeaders;

  @Option(
      name = "remote_cache_header",
      converter = Converters.AssignmentConverter.class,
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify a header that will be included in cache requests: "
              + "--remote_cache_header=Name=Value. "
              + "Multiple headers can be passed by specifying the flag multiple times. Multiple "
              + "values for the same name will be converted to a comma-separated list.",
      allowMultiple = true)
  public List<Entry<String, String>> remoteCacheHeaders;

  @Option(
      name = "remote_exec_header",
      converter = Converters.AssignmentConverter.class,
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify a header that will be included in execution requests: "
              + "--remote_exec_header=Name=Value. "
              + "Multiple headers can be passed by specifying the flag multiple times. Multiple "
              + "values for the same name will be converted to a comma-separated list.",
      allowMultiple = true)
  public List<Entry<String, String>> remoteExecHeaders;

  @Option(
      name = "remote_downloader_header",
      converter = Converters.AssignmentConverter.class,
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Specify a header that will be included in remote downloader requests: "
              + "--remote_downloader_header=Name=Value. "
              + "Multiple headers can be passed by specifying the flag multiple times. Multiple "
              + "values for the same name will be converted to a comma-separated list.",
      allowMultiple = true)
  public List<Entry<String, String>> remoteDownloaderHeaders;

  @Option(
      name = "remote_timeout",
      defaultValue = "60s",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      converter = RemoteTimeoutConverter.class,
      help =
          "The maximum amount of time to wait for remote execution and cache calls. For the REST"
              + " cache, this is both the connect and the read timeout. Following units can be"
              + " used: Days (d), hours (h), minutes (m), seconds (s), and milliseconds (ms). If"
              + " the unit is omitted, the value is interpreted as seconds.")
  public Duration remoteTimeout;

  @Option(
      name = "remote_bytestream_uri_prefix",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "The hostname and instance name to be used in bytestream:// URIs that are written into "
              + "build event streams. This option can be set when builds are performed using a "
              + "proxy, which causes the values of --remote_executor and --remote_instance_name "
              + "to no longer correspond to the canonical name of the remote execution service. "
              + "When not set, it will default to \"${hostname}/${instance_name}\".")
  public String remoteBytestreamUriPrefix;

  /** Returns the specified duration. Assumes seconds if unitless. */
  public static class RemoteTimeoutConverter implements Converter<Duration> {
    private static final Pattern UNITLESS_REGEX = Pattern.compile("^[0-9]+$");

    @Override
    public Duration convert(String input) throws OptionsParsingException {
      if (UNITLESS_REGEX.matcher(input).matches()) {
        input += "s";
      }
      return new Converters.DurationConverter().convert(input);
    }

    @Override
    public String getTypeDescription() {
      return "An immutable length of time.";
    }
  }

  @Option(
      name = "remote_accept_cached",
      defaultValue = "true",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Whether to accept remotely cached action results.")
  public boolean remoteAcceptCached;

  @Option(
      name = "remote_local_fallback",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Whether to fall back to standalone local execution strategy if remote execution fails.")
  public boolean remoteLocalFallback;

  @Deprecated
  @Option(
      name = "remote_local_fallback_strategy",
      defaultValue = "local",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "No-op, deprecated. See https://github.com/bazelbuild/bazel/issues/7480 for details.")
  public String remoteLocalFallbackStrategy;

  @Option(
      name = "remote_upload_local_results",
      defaultValue = "true",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Whether to upload locally executed action results to the remote cache.")
  public boolean remoteUploadLocalResults;

  @Option(
      name = "incompatible_remote_results_ignore_disk",
      defaultValue = "false",
      category = "remote",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      metadataTags = {
        OptionMetadataTag.INCOMPATIBLE_CHANGE,
        OptionMetadataTag.TRIGGERED_BY_ALL_INCOMPATIBLE_CHANGES
      },
      help =
          "If set to true, --noremote_upload_local_results and --noremote_accept_cached will not"
              + " apply to the disk cache. If a combined cache is used:\n"
              + "\t--noremote_upload_local_results will cause results to be written to the disk"
              + " cache, but not uploaded to the remote cache.\n"
              + "\t--noremote_accept_cached will result in Bazel checking for results in the disk"
              + " cache, but not in the remote cache.\n"
              + "See #8216 for details.")
  public boolean incompatibleRemoteResultsIgnoreDisk;

  @Option(
      name = "incompatible_remote_output_paths_relative_to_input_root",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      metadataTags = {
        OptionMetadataTag.INCOMPATIBLE_CHANGE,
        OptionMetadataTag.TRIGGERED_BY_ALL_INCOMPATIBLE_CHANGES
      },
      help =
          "If set to true, output paths are relative to input root instead of working directory.")
  public boolean incompatibleRemoteOutputPathsRelativeToInputRoot;

  @Option(
      name = "remote_instance_name",
      defaultValue = "",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Value to pass as instance_name in the remote execution API.")
  public String remoteInstanceName;

  @Option(
      name = "remote_retries",
      oldName = "experimental_remote_retry_max_attempts",
      defaultValue = "5",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "The maximum number of attempts to retry a transient error. "
              + "If set to 0, retries are disabled.")
  public int remoteMaxRetryAttempts;

  @Option(
      name = "disk_cache",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      converter = OptionsUtils.PathFragmentConverter.class,
      help =
          "A path to a directory where Bazel can read and write actions and action outputs. "
              + "If the directory does not exist, it will be created.")
  public PathFragment diskCache;

  @Option(
      name = "experimental_guard_against_concurrent_changes",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "Turn this off to disable checking the ctime of input files of an action before "
              + "uploading it to a remote cache. There may be cases where the Linux kernel delays "
              + "writing of files, which could cause false positives.")
  public boolean experimentalGuardAgainstConcurrentChanges;

  @Option(
      name = "experimental_remote_grpc_log",
      defaultValue = "null",
      category = "remote",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      converter = OptionsUtils.PathFragmentConverter.class,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "If specified, a path to a file to log gRPC call related details. This log consists of a"
              + " sequence of serialized "
              + "com.google.devtools.build.lib.remote.logging.RemoteExecutionLog.LogEntry "
              + "protobufs with each message prefixed by a varint denoting the size of the"
              + " following serialized protobuf message, as performed by the method "
              + "LogEntry.writeDelimitedTo(OutputStream).")
  public PathFragment experimentalRemoteGrpcLog;

  @Option(
      name = "incompatible_remote_symlinks",
      defaultValue = "true",
      category = "remote",
      documentationCategory = OptionDocumentationCategory.EXECUTION_STRATEGY,
      effectTags = {OptionEffectTag.EXECUTION},
      metadataTags = {
        OptionMetadataTag.INCOMPATIBLE_CHANGE,
        OptionMetadataTag.TRIGGERED_BY_ALL_INCOMPATIBLE_CHANGES
      },
      help =
          "If set to true, Bazel will represent symlinks in action outputs "
              + "in the remote caching/execution protocol as such. The "
              + "current behavior is for remote caches/executors to follow "
              + "symlinks and represent them as files. See #6631 for details.")
  public boolean incompatibleRemoteSymlinks;

  @Option(
      name = "build_event_upload_max_threads",
      defaultValue = "100",
      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "The number of threads used to do build event uploads. Capped at 1000.")
  public int buildEventUploadMaxThreads;

  @Deprecated
  @Option(
      name = "remote_allow_symlink_upload",
      defaultValue = "true",
      category = "remote",
      documentationCategory = OptionDocumentationCategory.EXECUTION_STRATEGY,
      effectTags = {OptionEffectTag.EXECUTION},
      help =
          "If true, upload action symlink outputs to the remote cache. "
              + "If this option is not enabled, "
              + "cachable actions that output symlinks will fail.")
  public boolean allowSymlinkUpload;

  @Option(
      name = "remote_download_outputs",
      oldName = "experimental_remote_download_outputs",
      defaultValue = "all",
      category = "remote",
      documentationCategory = OptionDocumentationCategory.OUTPUT_PARAMETERS,
      effectTags = {OptionEffectTag.AFFECTS_OUTPUTS},
      converter = RemoteOutputsStrategyConverter.class,
      help =
          "If set to 'minimal' doesn't download any remote build outputs to the local machine, "
              + "except the ones required by local actions. If set to 'toplevel' behaves like"
              + "'minimal' except that it also downloads outputs of top level targets to the local "
              + "machine. Both options can significantly reduce build times if network bandwidth "
              + "is a bottleneck.")
  public RemoteOutputsMode remoteOutputsMode;

  /** Outputs strategy flag parser */
  public static class RemoteOutputsStrategyConverter extends EnumConverter<RemoteOutputsMode> {
    public RemoteOutputsStrategyConverter() {
      super(RemoteOutputsMode.class, "download remote outputs");
    }
  }

  @Option(
      name = "remote_download_minimal",
      oldName = "experimental_remote_download_minimal",
      defaultValue = "null",
      expansion = {
        "--nobuild_runfile_links",
        "--experimental_inmemory_jdeps_files",
        "--experimental_inmemory_dotd_files",
        "--remote_download_outputs=minimal"
      },
      category = "remote",
      documentationCategory = OptionDocumentationCategory.OUTPUT_PARAMETERS,
      effectTags = {OptionEffectTag.AFFECTS_OUTPUTS},
      help =
          "Does not download any remote build outputs to the local machine. This flag is a "
              + "shortcut for three flags: --experimental_inmemory_jdeps_files, "
              + "--experimental_inmemory_dotd_files and "
              + "--remote_download_outputs=minimal.")
  public Void remoteOutputsMinimal;

  @Option(
      name = "remote_download_toplevel",
      oldName = "experimental_remote_download_toplevel",
      defaultValue = "null",
      expansion = {
        "--experimental_inmemory_jdeps_files",
        "--experimental_inmemory_dotd_files",
        "--remote_download_outputs=toplevel"
      },
      category = "remote",
      documentationCategory = OptionDocumentationCategory.OUTPUT_PARAMETERS,
      effectTags = {OptionEffectTag.AFFECTS_OUTPUTS},
      help =
          "Only downloads remote outputs of top level targets to the local machine. This flag is a "
              + "shortcut for three flags: --experimental_inmemory_jdeps_files, "
              + "--experimental_inmemory_dotd_files and "
              + "--remote_download_outputs=toplevel.")
  public Void remoteOutputsToplevel;

  @Option(
      name = "remote_result_cache_priority",
      defaultValue = "0",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "The relative priority of remote actions to be stored in remote cache. "
              + "The semantics of the particular priority values are server-dependent.")
  public int remoteResultCachePriority;

  @Option(
      name = "remote_execution_priority",
      defaultValue = "0",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "The relative priority of actions to be executed remotely. "
              + "The semantics of the particular priority values are server-dependent.")
  public int remoteExecutionPriority;

  @Option(
      name = "remote_default_platform_properties",
      oldName = "host_platform_remote_properties_override",
      defaultValue = "",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      deprecationWarning =
          "--remote_default_platform_properties has been deprecated in favor of"
              + " --remote_default_exec_properties.",
      help =
          "Set the default platform properties to be set for the remote execution API, "
              + "if the execution platform does not already set remote_execution_properties. "
              + "This value will also be used if the host platform is selected as the execution "
              + "platform for remote execution.")
  public String remoteDefaultPlatformProperties;

  @Option(
      name = "remote_default_exec_properties",
      defaultValue = "null",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.AFFECTS_OUTPUTS},
      converter = AssignmentConverter.class,
      allowMultiple = true,
      help =
          "Set the default exec properties to be used as the remote execution platform "
              + "if an execution platform does not already set exec_properties.")
  public List<Map.Entry<String, String>> remoteDefaultExecProperties;

  @Option(
      name = "remote_verify_downloads",
      defaultValue = "true",
      documentationCategory = OptionDocumentationCategory.REMOTE,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "If set to true, Bazel will compute the hash sum of all remote downloads and "
              + " discard the remotely cached values if they don't match the expected value.")
  public boolean remoteVerifyDownloads;

  @Option(
      name = "remote_download_symlink_template",
      defaultValue = "",
      category = "remote",
      documentationCategory = OptionDocumentationCategory.OUTPUT_PARAMETERS,
      effectTags = {OptionEffectTag.AFFECTS_OUTPUTS},
      help =
          "Instead of downloading remote build outputs to the local machine, create symbolic "
              + "links. The target of the symbolic links can be specified in the form of a "
              + "template string. This template string may contain {hash} and {size_bytes} that "
              + "expand to the hash of the object and the size in bytes, respectively. "
              + "These symbolic links may, for example, point to a FUSE file system "
              + "that loads objects from the CAS on demand.")
  public String remoteDownloadSymlinkTemplate;

  // The below options are not configurable by users, only tests.
  // This is part of the effort to reduce the overall number of flags.

  /** The maximum size of an outbound message sent via a gRPC channel. */
  public int maxOutboundMessageSize = 1024 * 1024;

  public boolean isRemoteEnabled() {
    return !Strings.isNullOrEmpty(remoteCache) || isRemoteExecutionEnabled();
  }

  public boolean isRemoteExecutionEnabled() {
    return !Strings.isNullOrEmpty(remoteExecutor);
  }

  /**
   * Returns the default exec properties specified by the user or an empty map if nothing was
   * specified. Use this method instead of directly accessing the fields.
   */
  public SortedMap<String, String> getRemoteDefaultExecProperties() throws UserExecException {
    boolean hasExecProperties = !remoteDefaultExecProperties.isEmpty();
    boolean hasPlatformProperties = !remoteDefaultPlatformProperties.isEmpty();

    if (hasExecProperties && hasPlatformProperties) {
      throw new UserExecException(
          createFailureDetail(
              "Setting both --remote_default_platform_properties and "
                  + "--remote_default_exec_properties is not allowed. Prefer setting "
                  + "--remote_default_exec_properties.",
              Code.INVALID_EXEC_AND_PLATFORM_PROPERTIES));
    }

    if (hasExecProperties) {
      return ImmutableSortedMap.copyOf(remoteDefaultExecProperties);
    }
    if (hasPlatformProperties) {
      // Try and use the provided default value.
      final Platform platform;
      try {
        Platform.Builder builder = Platform.newBuilder();
        TextFormat.getParser().merge(remoteDefaultPlatformProperties, builder);
        platform = builder.build();
      } catch (ParseException e) {
        String message =
            "Failed to parse --remote_default_platform_properties "
                + remoteDefaultPlatformProperties;
        throw new UserExecException(
            e, createFailureDetail(message, Code.REMOTE_DEFAULT_PLATFORM_PROPERTIES_PARSE_FAILURE));
      }

      ImmutableSortedMap.Builder<String, String> builder = ImmutableSortedMap.naturalOrder();
      for (Property property : platform.getPropertiesList()) {
        builder.put(property.getName(), property.getValue());
      }
      return builder.build();
    }

    return ImmutableSortedMap.of();
  }

  private static FailureDetail createFailureDetail(String message, Code detailedCode) {
    return FailureDetail.newBuilder()
        .setMessage(message)
        .setRemoteExecution(RemoteExecution.newBuilder().setCode(detailedCode))
        .build();
  }
}