// Copyright 2020 Google LLC
//
// 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.

syntax = "proto3";

package google.cloud.osconfig.agentendpoint.v1beta;

import "google/api/field_behavior.proto";
import "google/cloud/osconfig/agentendpoint/v1beta/patch_jobs.proto";

option go_package = "google.golang.org/genproto/googleapis/cloud/osconfig/agentendpoint/v1beta;agentendpoint";
option java_outer_classname = "Tasks";
option java_package = "com.google.cloud.osconfig.agentendpoint.v1beta";

// Specifies the current agent behavior.
enum TaskDirective {
  // Unspecified is invalid.
  TASK_DIRECTIVE_UNSPECIFIED = 0;

  // The task should continue to progress.
  CONTINUE = 1;

  // Task should not be started, or if already in progress, should stop
  // at first safe stopping point.  Task should be considered done and will
  // never repeat.
  STOP = 2;
}

// Specifies the type of task to perform.
enum TaskType {
  // Unspecified is invalid.
  TASK_TYPE_UNSPECIFIED = 0;

  // The apply patches task.
  APPLY_PATCHES = 1;

  // The exec step task.
  EXEC_STEP_TASK = 2;
}

// A unit of work to be performed by the agent.
message Task {
  // Unique task id.
  string task_id = 1;

  // The type of task to perform.
  //
  // Task details must include the appropriate message based on this enum as
  // specified below:
  // APPLY_PATCHES = ApplyPatchesTask
  // EXEC_STEP = ExecStepTask;
  TaskType task_type = 2;

  // Current directive to the agent.
  TaskDirective task_directive = 3;

  // Specific details about the current task to perform.
  oneof task_details {
    // Details about the apply patches task to perform.
    ApplyPatchesTask apply_patches_task = 4;

    // Details about the exec step task to perform.
    ExecStepTask exec_step_task = 5;
  }

  // Labels describing the task.  Used for logging by the agent.
  map<string, string> service_labels = 6;
}

// Message which instructs agent to apply patches.
message ApplyPatchesTask {
  // Specific information about how patches should be applied.
  PatchConfig patch_config = 1;

  // If true, the agent will report its status as it goes through the motions
  // but won't actually run any updates or perform any reboots.
  bool dry_run = 3;
}

// Information reported from the agent about applying patches execution.
message ApplyPatchesTaskProgress {
  // The intermediate states of applying patches.
  enum State {
    // Unspecified is invalid.
    STATE_UNSPECIFIED = 0;

    // The agent has started the patch task.
    STARTED = 4;

    // The agent is currently downloading patches.
    DOWNLOADING_PATCHES = 1;

    // The agent is currently applying patches.
    APPLYING_PATCHES = 2;

    // The agent is currently rebooting the VM instance.
    REBOOTING = 3;
  }

  // Required. The current state of this patch execution.
  State state = 1 [(google.api.field_behavior) = REQUIRED];
}

// Information reported from the agent about applying patches execution.
message ApplyPatchesTaskOutput {
  // The final states of applying patches.
  enum State {
    // Unspecified is invalid.
    STATE_UNSPECIFIED = 0;

    // Applying patches completed successfully.
    SUCCEEDED = 1;

    // Applying patches completed successfully, but a reboot is required.
    SUCCEEDED_REBOOT_REQUIRED = 2;

    // Applying patches failed.
    FAILED = 3;
  }

  // Required. The final state of this task.
  State state = 1 [(google.api.field_behavior) = REQUIRED];
}

// Message which instructs agent to execute the following command.
message ExecStepTask {
  // Details of the exec step to run.
  ExecStep exec_step = 1;
}

// Information reported from the agent about the exec step execution.
message ExecStepTaskProgress {
  // The intermediate states of exec steps.
  enum State {
    // Unspecified is invalid.
    STATE_UNSPECIFIED = 0;

    // The agent has started the exec step task.
    STARTED = 1;
  }

  // Required. The current state of this exec step.
  State state = 1 [(google.api.field_behavior) = REQUIRED];
}

// Information reported from the agent about the exec step execution.
message ExecStepTaskOutput {
  // The final states of exec steps.
  enum State {
    // Unspecified is invalid.
    STATE_UNSPECIFIED = 0;

    // The exec step completed normally.
    COMPLETED = 1;

    // The exec step was terminated because it took too long.
    TIMED_OUT = 2;

    // The exec step task was cancelled before it started.
    CANCELLED = 3;
  }

  // Required. The final state of the exec step.
  State state = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The exit code received from the script which ran as part of the exec step.
  int32 exit_code = 2 [(google.api.field_behavior) = REQUIRED];
}