// Copyright 2018 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.tasks.v2beta2;

import "google/api/annotations.proto";
import "google/cloud/tasks/v2beta2/queue.proto";
import "google/cloud/tasks/v2beta2/task.proto";
import "google/iam/v1/iam_policy.proto";
import "google/iam/v1/policy.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/empty.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/timestamp.proto";
import "google/rpc/code.proto";

option go_package = "google.golang.org/genproto/googleapis/cloud/tasks/v2beta2;tasks";
option java_multiple_files = true;
option java_outer_classname = "CloudTasksProto";
option java_package = "com.google.cloud.tasks.v2beta2";
option objc_class_prefix = "TASKS";

// Cloud Tasks allows developers to manage the execution of background
// work in their applications.
service CloudTasks {
  // Lists queues.
  //
  // Queues are returned in lexicographical order.
  rpc ListQueues(ListQueuesRequest) returns (ListQueuesResponse) {
    option (google.api.http) = {
      get: "/v2beta2/{parent=projects/*/locations/*}/queues"
    };
  }

  // Gets a queue.
  rpc GetQueue(GetQueueRequest) returns (Queue) {
    option (google.api.http) = {
      get: "/v2beta2/{name=projects/*/locations/*/queues/*}"
    };
  }

  // Creates a queue.
  //
  // Queues created with this method allow tasks to live for a maximum of 31
  // days. After a task is 31 days old, the task will be deleted regardless of
  // whether it was dispatched or not.
  //
  // WARNING: Using this method may have unintended side effects if you are
  // using an App Engine `queue.yaml` or `queue.xml` file to manage your queues.
  // Read
  // [Overview of Queue Management and
  // queue.yaml](https://cloud.google.com/tasks/docs/queue-yaml) before using
  // this method.
  rpc CreateQueue(CreateQueueRequest) returns (Queue) {
    option (google.api.http) = {
      post: "/v2beta2/{parent=projects/*/locations/*}/queues"
      body: "queue"
    };
  }

  // Updates a queue.
  //
  // This method creates the queue if it does not exist and updates
  // the queue if it does exist.
  //
  // Queues created with this method allow tasks to live for a maximum of 31
  // days. After a task is 31 days old, the task will be deleted regardless of
  // whether it was dispatched or not.
  //
  // WARNING: Using this method may have unintended side effects if you are
  // using an App Engine `queue.yaml` or `queue.xml` file to manage your queues.
  // Read
  // [Overview of Queue Management and
  // queue.yaml](https://cloud.google.com/tasks/docs/queue-yaml) before using
  // this method.
  rpc UpdateQueue(UpdateQueueRequest) returns (Queue) {
    option (google.api.http) = {
      patch: "/v2beta2/{queue.name=projects/*/locations/*/queues/*}"
      body: "queue"
    };
  }

  // Deletes a queue.
  //
  // This command will delete the queue even if it has tasks in it.
  //
  // Note: If you delete a queue, a queue with the same name can't be created
  // for 7 days.
  //
  // WARNING: Using this method may have unintended side effects if you are
  // using an App Engine `queue.yaml` or `queue.xml` file to manage your queues.
  // Read
  // [Overview of Queue Management and
  // queue.yaml](https://cloud.google.com/tasks/docs/queue-yaml) before using
  // this method.
  rpc DeleteQueue(DeleteQueueRequest) returns (google.protobuf.Empty) {
    option (google.api.http) = {
      delete: "/v2beta2/{name=projects/*/locations/*/queues/*}"
    };
  }

  // Purges a queue by deleting all of its tasks.
  //
  // All tasks created before this method is called are permanently deleted.
  //
  // Purge operations can take up to one minute to take effect. Tasks
  // might be dispatched before the purge takes effect. A purge is irreversible.
  rpc PurgeQueue(PurgeQueueRequest) returns (Queue) {
    option (google.api.http) = {
      post: "/v2beta2/{name=projects/*/locations/*/queues/*}:purge"
      body: "*"
    };
  }

  // Pauses the queue.
  //
  // If a queue is paused then the system will stop dispatching tasks
  // until the queue is resumed via
  // [ResumeQueue][google.cloud.tasks.v2beta2.CloudTasks.ResumeQueue]. Tasks can
  // still be added when the queue is paused. A queue is paused if its
  // [state][google.cloud.tasks.v2beta2.Queue.state] is
  // [PAUSED][google.cloud.tasks.v2beta2.Queue.State.PAUSED].
  rpc PauseQueue(PauseQueueRequest) returns (Queue) {
    option (google.api.http) = {
      post: "/v2beta2/{name=projects/*/locations/*/queues/*}:pause"
      body: "*"
    };
  }

  // Resume a queue.
  //
  // This method resumes a queue after it has been
  // [PAUSED][google.cloud.tasks.v2beta2.Queue.State.PAUSED] or
  // [DISABLED][google.cloud.tasks.v2beta2.Queue.State.DISABLED]. The state of a
  // queue is stored in the queue's
  // [state][google.cloud.tasks.v2beta2.Queue.state]; after calling this method
  // it will be set to
  // [RUNNING][google.cloud.tasks.v2beta2.Queue.State.RUNNING].
  //
  // WARNING: Resuming many high-QPS queues at the same time can
  // lead to target overloading. If you are resuming high-QPS
  // queues, follow the 500/50/5 pattern described in
  // [Managing Cloud Tasks Scaling
  // Risks](https://cloud.google.com/tasks/docs/manage-cloud-task-scaling).
  rpc ResumeQueue(ResumeQueueRequest) returns (Queue) {
    option (google.api.http) = {
      post: "/v2beta2/{name=projects/*/locations/*/queues/*}:resume"
      body: "*"
    };
  }

  // Gets the access control policy for a
  // [Queue][google.cloud.tasks.v2beta2.Queue]. Returns an empty policy if the
  // resource exists and does not have a policy set.
  //
  // Authorization requires the following
  // [Google IAM](https://cloud.google.com/iam) permission on the specified
  // resource parent:
  //
  // * `cloudtasks.queues.getIamPolicy`
  rpc GetIamPolicy(google.iam.v1.GetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.http) = {
      post: "/v2beta2/{resource=projects/*/locations/*/queues/*}:getIamPolicy"
      body: "*"
    };
  }

  // Sets the access control policy for a
  // [Queue][google.cloud.tasks.v2beta2.Queue]. Replaces any existing policy.
  //
  // Note: The Cloud Console does not check queue-level IAM permissions yet.
  // Project-level permissions are required to use the Cloud Console.
  //
  // Authorization requires the following
  // [Google IAM](https://cloud.google.com/iam) permission on the specified
  // resource parent:
  //
  // * `cloudtasks.queues.setIamPolicy`
  rpc SetIamPolicy(google.iam.v1.SetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.http) = {
      post: "/v2beta2/{resource=projects/*/locations/*/queues/*}:setIamPolicy"
      body: "*"
    };
  }

  // Returns permissions that a caller has on a
  // [Queue][google.cloud.tasks.v2beta2.Queue]. If the resource does not exist,
  // this will return an empty set of permissions, not a
  // [NOT_FOUND][google.rpc.Code.NOT_FOUND] error.
  //
  // Note: This operation is designed to be used for building permission-aware
  // UIs and command-line tools, not for authorization checking. This operation
  // may "fail open" without warning.
  rpc TestIamPermissions(google.iam.v1.TestIamPermissionsRequest)
      returns (google.iam.v1.TestIamPermissionsResponse) {
    option (google.api.http) = {
      post: "/v2beta2/{resource=projects/*/locations/*/queues/*}:testIamPermissions"
      body: "*"
    };
  }

  // Lists the tasks in a queue.
  //
  // By default, only the [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]
  // view is retrieved due to performance considerations;
  // [response_view][google.cloud.tasks.v2beta2.ListTasksRequest.response_view]
  // controls the subset of information which is returned.
  //
  // The tasks may be returned in any order. The ordering may change at any
  // time.
  rpc ListTasks(ListTasksRequest) returns (ListTasksResponse) {
    option (google.api.http) = {
      get: "/v2beta2/{parent=projects/*/locations/*/queues/*}/tasks"
    };
  }

  // Gets a task.
  rpc GetTask(GetTaskRequest) returns (Task) {
    option (google.api.http) = {
      get: "/v2beta2/{name=projects/*/locations/*/queues/*/tasks/*}"
    };
  }

  // Creates a task and adds it to a queue.
  //
  // Tasks cannot be updated after creation; there is no UpdateTask command.
  //
  // * For [App Engine queues][google.cloud.tasks.v2beta2.AppEngineHttpTarget],
  // the maximum task size is
  //   100KB.
  // * For [pull queues][google.cloud.tasks.v2beta2.PullTarget], the maximum
  // task size is 1MB.
  rpc CreateTask(CreateTaskRequest) returns (Task) {
    option (google.api.http) = {
      post: "/v2beta2/{parent=projects/*/locations/*/queues/*}/tasks"
      body: "*"
    };
  }

  // Deletes a task.
  //
  // A task can be deleted if it is scheduled or dispatched. A task
  // cannot be deleted if it has completed successfully or permanently
  // failed.
  rpc DeleteTask(DeleteTaskRequest) returns (google.protobuf.Empty) {
    option (google.api.http) = {
      delete: "/v2beta2/{name=projects/*/locations/*/queues/*/tasks/*}"
    };
  }

  // Leases tasks from a pull queue for
  // [lease_duration][google.cloud.tasks.v2beta2.LeaseTasksRequest.lease_duration].
  //
  // This method is invoked by the worker to obtain a lease. The
  // worker must acknowledge the task via
  // [AcknowledgeTask][google.cloud.tasks.v2beta2.CloudTasks.AcknowledgeTask]
  // after they have performed the work associated with the task.
  //
  // The [payload][google.cloud.tasks.v2beta2.PullMessage.payload] is intended
  // to store data that the worker needs to perform the work associated with the
  // task. To return the payloads in the
  // [response][google.cloud.tasks.v2beta2.LeaseTasksResponse], set
  // [response_view][google.cloud.tasks.v2beta2.LeaseTasksRequest.response_view]
  // to [FULL][google.cloud.tasks.v2beta2.Task.View.FULL].
  //
  // A maximum of 10 qps of
  // [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] requests are
  // allowed per queue. [RESOURCE_EXHAUSTED][google.rpc.Code.RESOURCE_EXHAUSTED]
  // is returned when this limit is
  // exceeded. [RESOURCE_EXHAUSTED][google.rpc.Code.RESOURCE_EXHAUSTED]
  // is also returned when
  // [max_tasks_dispatched_per_second][google.cloud.tasks.v2beta2.RateLimits.max_tasks_dispatched_per_second]
  // is exceeded.
  rpc LeaseTasks(LeaseTasksRequest) returns (LeaseTasksResponse) {
    option (google.api.http) = {
      post: "/v2beta2/{parent=projects/*/locations/*/queues/*}/tasks:lease"
      body: "*"
    };
  }

  // Acknowledges a pull task.
  //
  // The worker, that is, the entity that
  // [leased][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] this task must
  // call this method to indicate that the work associated with the task has
  // finished.
  //
  // The worker must acknowledge a task within the
  // [lease_duration][google.cloud.tasks.v2beta2.LeaseTasksRequest.lease_duration]
  // or the lease will expire and the task will become available to be leased
  // again. After the task is acknowledged, it will not be returned
  // by a later [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks],
  // [GetTask][google.cloud.tasks.v2beta2.CloudTasks.GetTask], or
  // [ListTasks][google.cloud.tasks.v2beta2.CloudTasks.ListTasks].
  rpc AcknowledgeTask(AcknowledgeTaskRequest) returns (google.protobuf.Empty) {
    option (google.api.http) = {
      post: "/v2beta2/{name=projects/*/locations/*/queues/*/tasks/*}:acknowledge"
      body: "*"
    };
  }

  // Renew the current lease of a pull task.
  //
  // The worker can use this method to extend the lease by a new
  // duration, starting from now. The new task lease will be
  // returned in the task's
  // [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time].
  rpc RenewLease(RenewLeaseRequest) returns (Task) {
    option (google.api.http) = {
      post: "/v2beta2/{name=projects/*/locations/*/queues/*/tasks/*}:renewLease"
      body: "*"
    };
  }

  // Cancel a pull task's lease.
  //
  // The worker can use this method to cancel a task's lease by
  // setting its [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time]
  // to now. This will make the task available to be leased to the next caller
  // of [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks].
  rpc CancelLease(CancelLeaseRequest) returns (Task) {
    option (google.api.http) = {
      post: "/v2beta2/{name=projects/*/locations/*/queues/*/tasks/*}:cancelLease"
      body: "*"
    };
  }

  // Forces a task to run now.
  //
  // When this method is called, Cloud Tasks will dispatch the task, even if
  // the task is already running, the queue has reached its
  // [RateLimits][google.cloud.tasks.v2beta2.RateLimits] or is
  // [PAUSED][google.cloud.tasks.v2beta2.Queue.State.PAUSED].
  //
  // This command is meant to be used for manual debugging. For
  // example, [RunTask][google.cloud.tasks.v2beta2.CloudTasks.RunTask] can be
  // used to retry a failed task after a fix has been made or to manually force
  // a task to be dispatched now.
  //
  // The dispatched task is returned. That is, the task that is returned
  // contains the [status][google.cloud.tasks.v2beta2.Task.status] after the
  // task is dispatched but before the task is received by its target.
  //
  // If Cloud Tasks receives a successful response from the task's
  // target, then the task will be deleted; otherwise the task's
  // [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time] will be
  // reset to the time that
  // [RunTask][google.cloud.tasks.v2beta2.CloudTasks.RunTask] was called plus
  // the retry delay specified in the queue's
  // [RetryConfig][google.cloud.tasks.v2beta2.RetryConfig].
  //
  // [RunTask][google.cloud.tasks.v2beta2.CloudTasks.RunTask] returns
  // [NOT_FOUND][google.rpc.Code.NOT_FOUND] when it is called on a
  // task that has already succeeded or permanently failed.
  //
  // [RunTask][google.cloud.tasks.v2beta2.CloudTasks.RunTask] cannot be called
  // on a [pull task][google.cloud.tasks.v2beta2.PullMessage].
  rpc RunTask(RunTaskRequest) returns (Task) {
    option (google.api.http) = {
      post: "/v2beta2/{name=projects/*/locations/*/queues/*/tasks/*}:run"
      body: "*"
    };
  }
}

// Request message for
// [ListQueues][google.cloud.tasks.v2beta2.CloudTasks.ListQueues].
message ListQueuesRequest {
  // Required.
  //
  // The location name.
  // For example: `projects/PROJECT_ID/locations/LOCATION_ID`
  string parent = 1;

  // `filter` can be used to specify a subset of queues. Any
  // [Queue][google.cloud.tasks.v2beta2.Queue] field can be used as a filter and
  // several operators as supported. For example: `<=, <, >=, >, !=, =, :`. The
  // filter syntax is the same as described in [Stackdriver's Advanced Logs
  // Filters](https://cloud.google.com/logging/docs/view/advanced_filters).
  //
  // Sample filter "app_engine_http_target: *".
  //
  // Note that using filters might cause fewer queues than the
  // requested_page size to be returned.
  string filter = 2;

  // Requested page size.
  //
  // The maximum page size is 9800. If unspecified, the page size will
  // be the maximum. Fewer queues than requested might be returned,
  // even if more queues exist; use the
  // [next_page_token][google.cloud.tasks.v2beta2.ListQueuesResponse.next_page_token]
  // in the response to determine if more queues exist.
  int32 page_size = 3;

  // A token identifying the page of results to return.
  //
  // To request the first page results, page_token must be empty. To
  // request the next page of results, page_token must be the value of
  // [next_page_token][google.cloud.tasks.v2beta2.ListQueuesResponse.next_page_token]
  // returned from the previous call to
  // [ListQueues][google.cloud.tasks.v2beta2.CloudTasks.ListQueues] method. It
  // is an error to switch the value of the
  // [filter][google.cloud.tasks.v2beta2.ListQueuesRequest.filter] while
  // iterating through pages.
  string page_token = 4;
}

// Response message for
// [ListQueues][google.cloud.tasks.v2beta2.CloudTasks.ListQueues].
message ListQueuesResponse {
  // The list of queues.
  repeated Queue queues = 1;

  // A token to retrieve next page of results.
  //
  // To return the next page of results, call
  // [ListQueues][google.cloud.tasks.v2beta2.CloudTasks.ListQueues] with this
  // value as the
  // [page_token][google.cloud.tasks.v2beta2.ListQueuesRequest.page_token].
  //
  // If the next_page_token is empty, there are no more results.
  //
  // The page token is valid for only 2 hours.
  string next_page_token = 2;
}

// Request message for
// [GetQueue][google.cloud.tasks.v2beta2.CloudTasks.GetQueue].
message GetQueueRequest {
  // Required.
  //
  // The resource name of the queue. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID`
  string name = 1;
}

// Request message for
// [CreateQueue][google.cloud.tasks.v2beta2.CloudTasks.CreateQueue].
message CreateQueueRequest {
  // Required.
  //
  // The location name in which the queue will be created.
  // For example: `projects/PROJECT_ID/locations/LOCATION_ID`
  //
  // The list of allowed locations can be obtained by calling Cloud
  // Tasks' implementation of
  // [ListLocations][google.cloud.location.Locations.ListLocations].
  string parent = 1;

  // Required.
  //
  // The queue to create.
  //
  // [Queue's name][google.cloud.tasks.v2beta2.Queue.name] cannot be the same as
  // an existing queue.
  Queue queue = 2;
}

// Request message for
// [UpdateQueue][google.cloud.tasks.v2beta2.CloudTasks.UpdateQueue].
message UpdateQueueRequest {
  // Required.
  //
  // The queue to create or update.
  //
  // The queue's [name][google.cloud.tasks.v2beta2.Queue.name] must be
  // specified.
  //
  // Output only fields cannot be modified using UpdateQueue.
  // Any value specified for an output only field will be ignored.
  // The queue's [name][google.cloud.tasks.v2beta2.Queue.name] cannot be
  // changed.
  Queue queue = 1;

  // A mask used to specify which fields of the queue are being updated.
  //
  // If empty, then all fields will be updated.
  google.protobuf.FieldMask update_mask = 2;
}

// Request message for
// [DeleteQueue][google.cloud.tasks.v2beta2.CloudTasks.DeleteQueue].
message DeleteQueueRequest {
  // Required.
  //
  // The queue name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID`
  string name = 1;
}

// Request message for
// [PurgeQueue][google.cloud.tasks.v2beta2.CloudTasks.PurgeQueue].
message PurgeQueueRequest {
  // Required.
  //
  // The queue name. For example:
  // `projects/PROJECT_ID/location/LOCATION_ID/queues/QUEUE_ID`
  string name = 1;
}

// Request message for
// [PauseQueue][google.cloud.tasks.v2beta2.CloudTasks.PauseQueue].
message PauseQueueRequest {
  // Required.
  //
  // The queue name. For example:
  // `projects/PROJECT_ID/location/LOCATION_ID/queues/QUEUE_ID`
  string name = 1;
}

// Request message for
// [ResumeQueue][google.cloud.tasks.v2beta2.CloudTasks.ResumeQueue].
message ResumeQueueRequest {
  // Required.
  //
  // The queue name. For example:
  // `projects/PROJECT_ID/location/LOCATION_ID/queues/QUEUE_ID`
  string name = 1;
}

// Request message for listing tasks using
// [ListTasks][google.cloud.tasks.v2beta2.CloudTasks.ListTasks].
message ListTasksRequest {
  // Required.
  //
  // The queue name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID`
  string parent = 1;

  // The response_view specifies which subset of the
  // [Task][google.cloud.tasks.v2beta2.Task] will be returned.
  //
  // By default response_view is
  // [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]; not all information is
  // retrieved by default because some data, such as payloads, might be
  // desirable to return only when needed because of its large size or because
  // of the sensitivity of data that it contains.
  //
  // Authorization for [FULL][google.cloud.tasks.v2beta2.Task.View.FULL]
  // requires `cloudtasks.tasks.fullView` [Google
  // IAM](https://cloud.google.com/iam/) permission on the
  // [Task][google.cloud.tasks.v2beta2.Task] resource.
  Task.View response_view = 2;

  // Requested page size. Fewer tasks than requested might be returned.
  //
  // The maximum page size is 1000. If unspecified, the page size will
  // be the maximum. Fewer tasks than requested might be returned,
  // even if more tasks exist; use
  // [next_page_token][google.cloud.tasks.v2beta2.ListTasksResponse.next_page_token]
  // in the response to determine if more tasks exist.
  int32 page_size = 4;

  // A token identifying the page of results to return.
  //
  // To request the first page results, page_token must be empty. To
  // request the next page of results, page_token must be the value of
  // [next_page_token][google.cloud.tasks.v2beta2.ListTasksResponse.next_page_token]
  // returned from the previous call to
  // [ListTasks][google.cloud.tasks.v2beta2.CloudTasks.ListTasks] method.
  //
  // The page token is valid for only 2 hours.
  string page_token = 5;
}

// Response message for listing tasks using
// [ListTasks][google.cloud.tasks.v2beta2.CloudTasks.ListTasks].
message ListTasksResponse {
  // The list of tasks.
  repeated Task tasks = 1;

  // A token to retrieve next page of results.
  //
  // To return the next page of results, call
  // [ListTasks][google.cloud.tasks.v2beta2.CloudTasks.ListTasks] with this
  // value as the
  // [page_token][google.cloud.tasks.v2beta2.ListTasksRequest.page_token].
  //
  // If the next_page_token is empty, there are no more results.
  string next_page_token = 2;
}

// Request message for getting a task using
// [GetTask][google.cloud.tasks.v2beta2.CloudTasks.GetTask].
message GetTaskRequest {
  // Required.
  //
  // The task name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID/tasks/TASK_ID`
  string name = 1;

  // The response_view specifies which subset of the
  // [Task][google.cloud.tasks.v2beta2.Task] will be returned.
  //
  // By default response_view is
  // [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]; not all information is
  // retrieved by default because some data, such as payloads, might be
  // desirable to return only when needed because of its large size or because
  // of the sensitivity of data that it contains.
  //
  // Authorization for [FULL][google.cloud.tasks.v2beta2.Task.View.FULL]
  // requires `cloudtasks.tasks.fullView` [Google
  // IAM](https://cloud.google.com/iam/) permission on the
  // [Task][google.cloud.tasks.v2beta2.Task] resource.
  Task.View response_view = 2;
}

// Request message for
// [CreateTask][google.cloud.tasks.v2beta2.CloudTasks.CreateTask].
message CreateTaskRequest {
  // Required.
  //
  // The queue name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID`
  //
  // The queue must already exist.
  string parent = 1;

  // Required.
  //
  // The task to add.
  //
  // Task names have the following format:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID/tasks/TASK_ID`.
  // The user can optionally specify a task
  // [name][google.cloud.tasks.v2beta2.Task.name]. If a name is not specified
  // then the system will generate a random unique task id, which will be set in
  // the task returned in the [response][google.cloud.tasks.v2beta2.Task.name].
  //
  // If [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time] is not
  // set or is in the past then Cloud Tasks will set it to the current time.
  //
  // Task De-duplication:
  //
  // Explicitly specifying a task ID enables task de-duplication.  If
  // a task's ID is identical to that of an existing task or a task
  // that was deleted or completed recently then the call will fail
  // with [ALREADY_EXISTS][google.rpc.Code.ALREADY_EXISTS].
  // If the task's queue was created using Cloud Tasks, then another task with
  // the same name can't be created for ~1hour after the original task was
  // deleted or completed. If the task's queue was created using queue.yaml or
  // queue.xml, then another task with the same name can't be created
  // for ~9days after the original task was deleted or completed.
  //
  // Because there is an extra lookup cost to identify duplicate task
  // names, these [CreateTask][google.cloud.tasks.v2beta2.CloudTasks.CreateTask]
  // calls have significantly increased latency. Using hashed strings for the
  // task id or for the prefix of the task id is recommended. Choosing task ids
  // that are sequential or have sequential prefixes, for example using a
  // timestamp, causes an increase in latency and error rates in all
  // task commands. The infrastructure relies on an approximately
  // uniform distribution of task ids to store and serve tasks
  // efficiently.
  Task task = 2;

  // The response_view specifies which subset of the
  // [Task][google.cloud.tasks.v2beta2.Task] will be returned.
  //
  // By default response_view is
  // [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]; not all information is
  // retrieved by default because some data, such as payloads, might be
  // desirable to return only when needed because of its large size or because
  // of the sensitivity of data that it contains.
  //
  // Authorization for [FULL][google.cloud.tasks.v2beta2.Task.View.FULL]
  // requires `cloudtasks.tasks.fullView` [Google
  // IAM](https://cloud.google.com/iam/) permission on the
  // [Task][google.cloud.tasks.v2beta2.Task] resource.
  Task.View response_view = 3;
}

// Request message for deleting a task using
// [DeleteTask][google.cloud.tasks.v2beta2.CloudTasks.DeleteTask].
message DeleteTaskRequest {
  // Required.
  //
  // The task name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID/tasks/TASK_ID`
  string name = 1;
}

// Request message for leasing tasks using
// [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks].
message LeaseTasksRequest {
  // Required.
  //
  // The queue name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID`
  string parent = 1;

  // The maximum number of tasks to lease.
  //
  // The system will make a best effort to return as close to as
  // `max_tasks` as possible.
  //
  // The largest that `max_tasks` can be is 1000.
  int32 max_tasks = 2;

  //
  // After the worker has successfully finished the work associated
  // with the task, the worker must call via
  // [AcknowledgeTask][google.cloud.tasks.v2beta2.CloudTasks.AcknowledgeTask]
  // before the [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time].
  // Otherwise the task will be returned to a later
  // [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] call so that
  // another worker can retry it.
  //
  // The maximum lease duration is 1 week.
  // `lease_duration` will be truncated to the nearest second.
  google.protobuf.Duration lease_duration = 3;

  // The response_view specifies which subset of the
  // [Task][google.cloud.tasks.v2beta2.Task] will be returned.
  //
  // By default response_view is
  // [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]; not all information is
  // retrieved by default because some data, such as payloads, might be
  // desirable to return only when needed because of its large size or because
  // of the sensitivity of data that it contains.
  //
  // Authorization for [FULL][google.cloud.tasks.v2beta2.Task.View.FULL]
  // requires `cloudtasks.tasks.fullView` [Google
  // IAM](https://cloud.google.com/iam/) permission on the
  // [Task][google.cloud.tasks.v2beta2.Task] resource.
  Task.View response_view = 4;

  // `filter` can be used to specify a subset of tasks to lease.
  //
  // When `filter` is set to `tag=<my-tag>` then the
  // [response][google.cloud.tasks.v2beta2.LeaseTasksResponse] will contain only
  // tasks whose [tag][google.cloud.tasks.v2beta2.PullMessage.tag] is equal to
  // `<my-tag>`. `<my-tag>` must be less than 500 characters.
  //
  // When `filter` is set to `tag_function=oldest_tag()`, only tasks which have
  // the same tag as the task with the oldest
  // [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time] will be
  // returned.
  //
  // Grammar Syntax:
  //
  // * `filter = "tag=" tag | "tag_function=" function`
  //
  // * `tag = string`
  //
  // * `function = "oldest_tag()"`
  //
  // The `oldest_tag()` function returns tasks which have the same tag as the
  // oldest task (ordered by schedule time).
  //
  // SDK compatibility: Although the SDK allows tags to be either
  // string or
  // [bytes](https://cloud.google.com/appengine/docs/standard/java/javadoc/com/google/appengine/api/taskqueue/TaskOptions.html#tag-byte:A-),
  // only UTF-8 encoded tags can be used in Cloud Tasks. Tag which
  // aren't UTF-8 encoded can't be used in the
  // [filter][google.cloud.tasks.v2beta2.LeaseTasksRequest.filter] and the
  // task's [tag][google.cloud.tasks.v2beta2.PullMessage.tag] will be displayed
  // as empty in Cloud Tasks.
  string filter = 5;
}

// Response message for leasing tasks using
// [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks].
message LeaseTasksResponse {
  // The leased tasks.
  repeated Task tasks = 1;
}

// Request message for acknowledging a task using
// [AcknowledgeTask][google.cloud.tasks.v2beta2.CloudTasks.AcknowledgeTask].
message AcknowledgeTaskRequest {
  // Required.
  //
  // The task name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID/tasks/TASK_ID`
  string name = 1;

  // Required.
  //
  // The task's current schedule time, available in the
  // [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time] returned by
  // [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] response or
  // [RenewLease][google.cloud.tasks.v2beta2.CloudTasks.RenewLease] response.
  // This restriction is to ensure that your worker currently holds the lease.
  google.protobuf.Timestamp schedule_time = 2;
}

// Request message for renewing a lease using
// [RenewLease][google.cloud.tasks.v2beta2.CloudTasks.RenewLease].
message RenewLeaseRequest {
  // Required.
  //
  // The task name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID/tasks/TASK_ID`
  string name = 1;

  // Required.
  //
  // The task's current schedule time, available in the
  // [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time] returned by
  // [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] response or
  // [RenewLease][google.cloud.tasks.v2beta2.CloudTasks.RenewLease] response.
  // This restriction is to ensure that your worker currently holds the lease.
  google.protobuf.Timestamp schedule_time = 2;

  // Required.
  //
  // The desired new lease duration, starting from now.
  //
  //
  // The maximum lease duration is 1 week.
  // `lease_duration` will be truncated to the nearest second.
  google.protobuf.Duration lease_duration = 3;

  // The response_view specifies which subset of the
  // [Task][google.cloud.tasks.v2beta2.Task] will be returned.
  //
  // By default response_view is
  // [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]; not all information is
  // retrieved by default because some data, such as payloads, might be
  // desirable to return only when needed because of its large size or because
  // of the sensitivity of data that it contains.
  //
  // Authorization for [FULL][google.cloud.tasks.v2beta2.Task.View.FULL]
  // requires `cloudtasks.tasks.fullView` [Google
  // IAM](https://cloud.google.com/iam/) permission on the
  // [Task][google.cloud.tasks.v2beta2.Task] resource.
  Task.View response_view = 4;
}

// Request message for canceling a lease using
// [CancelLease][google.cloud.tasks.v2beta2.CloudTasks.CancelLease].
message CancelLeaseRequest {
  // Required.
  //
  // The task name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID/tasks/TASK_ID`
  string name = 1;

  // Required.
  //
  // The task's current schedule time, available in the
  // [schedule_time][google.cloud.tasks.v2beta2.Task.schedule_time] returned by
  // [LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] response or
  // [RenewLease][google.cloud.tasks.v2beta2.CloudTasks.RenewLease] response.
  // This restriction is to ensure that your worker currently holds the lease.
  google.protobuf.Timestamp schedule_time = 2;

  // The response_view specifies which subset of the
  // [Task][google.cloud.tasks.v2beta2.Task] will be returned.
  //
  // By default response_view is
  // [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]; not all information is
  // retrieved by default because some data, such as payloads, might be
  // desirable to return only when needed because of its large size or because
  // of the sensitivity of data that it contains.
  //
  // Authorization for [FULL][google.cloud.tasks.v2beta2.Task.View.FULL]
  // requires `cloudtasks.tasks.fullView` [Google
  // IAM](https://cloud.google.com/iam/) permission on the
  // [Task][google.cloud.tasks.v2beta2.Task] resource.
  Task.View response_view = 3;
}

// Request message for forcing a task to run now using
// [RunTask][google.cloud.tasks.v2beta2.CloudTasks.RunTask].
message RunTaskRequest {
  // Required.
  //
  // The task name. For example:
  // `projects/PROJECT_ID/locations/LOCATION_ID/queues/QUEUE_ID/tasks/TASK_ID`
  string name = 1;

  // The response_view specifies which subset of the
  // [Task][google.cloud.tasks.v2beta2.Task] will be returned.
  //
  // By default response_view is
  // [BASIC][google.cloud.tasks.v2beta2.Task.View.BASIC]; not all information is
  // retrieved by default because some data, such as payloads, might be
  // desirable to return only when needed because of its large size or because
  // of the sensitivity of data that it contains.
  //
  // Authorization for [FULL][google.cloud.tasks.v2beta2.Task.View.FULL]
  // requires `cloudtasks.tasks.fullView` [Google
  // IAM](https://cloud.google.com/iam/) permission on the
  // [Task][google.cloud.tasks.v2beta2.Task] resource.
  Task.View response_view = 2;
}