// Copyright 2022 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.datacatalog.lineage.v1;

import "google/api/annotations.proto";
import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/longrunning/operations.proto";
import "google/protobuf/empty.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/struct.proto";
import "google/protobuf/timestamp.proto";

option csharp_namespace = "Google.Cloud.DataCatalog.Lineage.V1";
option go_package = "cloud.google.com/go/datacatalog/lineage/apiv1/lineagepb;lineagepb";
option java_multiple_files = true;
option java_outer_classname = "LineageProto";
option java_package = "com.google.cloud.datacatalog.lineage.v1";
option php_namespace = "Google\\Cloud\\DataCatalog\\Lineage\\V1";
option ruby_package = "Google::Cloud::DataCatalog::Lineage::V1";

// Lineage is used to track data flows between assets over time. You can
// create [LineageEvents][google.cloud.datacatalog.lineage.v1.LineageEvent]
// to record lineage between multiple sources and a single target, for
// example, when table data is based on data from multiple tables.
service Lineage {
  option (google.api.default_host) = "datalineage.googleapis.com";
  option (google.api.oauth_scopes) =
      "https://www.googleapis.com/auth/cloud-platform";

  // Creates a new process.
  rpc CreateProcess(CreateProcessRequest) returns (Process) {
    option (google.api.http) = {
      post: "/v1/{parent=projects/*/locations/*}/processes"
      body: "process"
    };
    option (google.api.method_signature) = "parent,process";
  }

  // Updates a process.
  rpc UpdateProcess(UpdateProcessRequest) returns (Process) {
    option (google.api.http) = {
      patch: "/v1/{process.name=projects/*/locations/*/processes/*}"
      body: "process"
    };
    option (google.api.method_signature) = "process,update_mask";
  }

  // Gets the details of the specified process.
  rpc GetProcess(GetProcessRequest) returns (Process) {
    option (google.api.http) = {
      get: "/v1/{name=projects/*/locations/*/processes/*}"
    };
    option (google.api.method_signature) = "name";
  }

  // List processes in the given project and location. List order is descending
  // by insertion time.
  rpc ListProcesses(ListProcessesRequest) returns (ListProcessesResponse) {
    option (google.api.http) = {
      get: "/v1/{parent=projects/*/locations/*}/processes"
    };
    option (google.api.method_signature) = "parent";
  }

  // Deletes the process with the specified name.
  rpc DeleteProcess(DeleteProcessRequest)
      returns (google.longrunning.Operation) {
    option (google.api.http) = {
      delete: "/v1/{name=projects/*/locations/*/processes/*}"
    };
    option (google.api.method_signature) = "name";
    option (google.longrunning.operation_info) = {
      response_type: "google.protobuf.Empty"
      metadata_type: "google.cloud.datacatalog.lineage.v1.OperationMetadata"
    };
  }

  // Creates a new run.
  rpc CreateRun(CreateRunRequest) returns (Run) {
    option (google.api.http) = {
      post: "/v1/{parent=projects/*/locations/*/processes/*}/runs"
      body: "run"
    };
    option (google.api.method_signature) = "parent,run";
  }

  // Updates a run.
  rpc UpdateRun(UpdateRunRequest) returns (Run) {
    option (google.api.http) = {
      patch: "/v1/{run.name=projects/*/locations/*/processes/*/runs/*}"
      body: "run"
    };
    option (google.api.method_signature) = "run,update_mask";
  }

  // Gets the details of the specified run.
  rpc GetRun(GetRunRequest) returns (Run) {
    option (google.api.http) = {
      get: "/v1/{name=projects/*/locations/*/processes/*/runs/*}"
    };
    option (google.api.method_signature) = "name";
  }

  // Lists runs in the given project and location. List order is descending by
  // `start_time`.
  rpc ListRuns(ListRunsRequest) returns (ListRunsResponse) {
    option (google.api.http) = {
      get: "/v1/{parent=projects/*/locations/*/processes/*}/runs"
    };
    option (google.api.method_signature) = "parent";
  }

  // Deletes the run with the specified name.
  rpc DeleteRun(DeleteRunRequest) returns (google.longrunning.Operation) {
    option (google.api.http) = {
      delete: "/v1/{name=projects/*/locations/*/processes/*/runs/*}"
    };
    option (google.api.method_signature) = "name";
    option (google.longrunning.operation_info) = {
      response_type: "google.protobuf.Empty"
      metadata_type: "google.cloud.datacatalog.lineage.v1.OperationMetadata"
    };
  }

  // Creates a new lineage event.
  rpc CreateLineageEvent(CreateLineageEventRequest) returns (LineageEvent) {
    option (google.api.http) = {
      post: "/v1/{parent=projects/*/locations/*/processes/*/runs/*}/lineageEvents"
      body: "lineage_event"
    };
    option (google.api.method_signature) = "parent,lineage_event";
  }

  // Gets details of a specified lineage event.
  rpc GetLineageEvent(GetLineageEventRequest) returns (LineageEvent) {
    option (google.api.http) = {
      get: "/v1/{name=projects/*/locations/*/processes/*/runs/*/lineageEvents/*}"
    };
    option (google.api.method_signature) = "name";
  }

  // Lists lineage events in the given project and location. The list order is
  // not defined.
  rpc ListLineageEvents(ListLineageEventsRequest)
      returns (ListLineageEventsResponse) {
    option (google.api.http) = {
      get: "/v1/{parent=projects/*/locations/*/processes/*/runs/*}/lineageEvents"
    };
    option (google.api.method_signature) = "parent";
  }

  // Deletes the lineage event with the specified name.
  rpc DeleteLineageEvent(DeleteLineageEventRequest)
      returns (google.protobuf.Empty) {
    option (google.api.http) = {
      delete: "/v1/{name=projects/*/locations/*/processes/*/runs/*/lineageEvents/*}"
    };
    option (google.api.method_signature) = "name";
  }

  // Retrieve a list of links connected to a specific asset.
  // Links represent the data flow between **source** (upstream)
  // and **target** (downstream) assets in transformation pipelines.
  // Links are stored in the same project as the Lineage Events that create
  // them.
  //
  // You can retrieve links in every project where you have the
  // `datalineage.events.get` permission. The project provided in the URL
  // is used for Billing and Quota.
  rpc SearchLinks(SearchLinksRequest) returns (SearchLinksResponse) {
    option (google.api.http) = {
      post: "/v1/{parent=projects/*/locations/*}:searchLinks"
      body: "*"
    };
  }

  // Retrieve information about LineageProcesses associated with specific
  // links. LineageProcesses are transformation pipelines that result in data
  // flowing from **source** to **target** assets. Links between assets
  // represent this operation.
  //
  // If you have specific link names, you can use this method to
  // verify which LineageProcesses contribute to creating those links.
  // See the
  // [SearchLinks][google.cloud.datacatalog.lineage.v1.Lineage.SearchLinks]
  // method for more information on how to retrieve link name.
  //
  // You can retrieve the LineageProcess information in every project where you
  // have the `datalineage.events.get` permission. The project provided in the
  // URL is used for Billing and Quota.
  rpc BatchSearchLinkProcesses(BatchSearchLinkProcessesRequest)
      returns (BatchSearchLinkProcessesResponse) {
    option (google.api.http) = {
      post: "/v1/{parent=projects/*/locations/*}:batchSearchLinkProcesses"
      body: "*"
    };
  }
}

// A process is the definition of a data transformation operation.
message Process {
  option (google.api.resource) = {
    type: "datalineage.googleapis.com/Process"
    pattern: "projects/{project}/locations/{location}/processes/{process}"
  };

  // Immutable. The resource name of the lineage process. Format:
  // `projects/{project}/locations/{location}/processes/{process}`.
  // Can be specified or auto-assigned.
  // {process} must be not longer than 200 characters and only
  // contain characters in a set: `a-zA-Z0-9_-:.`
  string name = 1 [(google.api.field_behavior) = IMMUTABLE];

  // Optional. A human-readable name you can set to display in a user interface.
  // Must be not longer than 200 characters and only contain UTF-8 letters
  // or numbers, spaces or characters like `_-:&.`
  string display_name = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The attributes of the process. Can be anything, for example,
  // "author". Up to 100 attributes are allowed.
  map<string, google.protobuf.Value> attributes = 3
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The origin of this process and its runs and lineage events.
  Origin origin = 4 [(google.api.field_behavior) = OPTIONAL];
}

// A lineage run represents an execution of a process that creates
// lineage events.
message Run {
  option (google.api.resource) = {
    type: "datalineage.googleapis.com/Run"
    pattern: "projects/{project}/locations/{location}/processes/{process}/runs/{run}"
  };

  // The current state of the run.
  enum State {
    // The state is unknown. The true state may be any of the below or a
    // different state that is not supported here explicitly.
    UNKNOWN = 0;

    // The run is still executing.
    STARTED = 1;

    // The run completed.
    COMPLETED = 2;

    // The run failed.
    FAILED = 3;

    // The run aborted.
    ABORTED = 4;
  }

  // Immutable. The resource name of the run. Format:
  // `projects/{project}/locations/{location}/processes/{process}/runs/{run}`.
  // Can be specified or auto-assigned.
  // {run} must be not longer than 200 characters and only
  // contain characters in a set: `a-zA-Z0-9_-:.`
  string name = 1 [(google.api.field_behavior) = IMMUTABLE];

  // Optional. A human-readable name you can set to display in a user interface.
  // Must be not longer than 1024 characters and only contain UTF-8 letters
  // or numbers, spaces or characters like `_-:&.`
  string display_name = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The attributes of the run. Can be anything, for example, a string
  // with an SQL request. Up to 100 attributes are allowed.
  map<string, google.protobuf.Value> attributes = 3
      [(google.api.field_behavior) = OPTIONAL];

  // Required. The timestamp of the start of the run.
  google.protobuf.Timestamp start_time = 4
      [(google.api.field_behavior) = REQUIRED];

  // Optional. The timestamp of the end of the run.
  google.protobuf.Timestamp end_time = 5
      [(google.api.field_behavior) = OPTIONAL];

  // Required. The state of the run.
  State state = 6 [(google.api.field_behavior) = REQUIRED];
}

// A lineage event represents an operation on assets. Within the operation, the
// data flows from the source to the target defined in the links field.
message LineageEvent {
  option (google.api.resource) = {
    type: "datalineage.googleapis.com/LineageEvent"
    pattern: "projects/{project}/locations/{location}/processes/{process}/runs/{run}/lineageEvents/{lineage_event}"
  };

  // Immutable. The resource name of the lineage event.
  // Format:
  // `projects/{project}/locations/{location}/processes/{process}/runs/{run}/lineageEvents/{lineage_event}`.
  // Can be specified or auto-assigned.
  // {lineage_event} must be not longer than 200 characters and only
  // contain characters in a set: `a-zA-Z0-9_-:.`
  string name = 1 [(google.api.field_behavior) = IMMUTABLE];

  // Optional. List of source-target pairs. Can't contain more than 100 tuples.
  repeated EventLink links = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The beginning of the transformation which resulted in this
  // lineage event. For streaming scenarios, it should be the beginning of the
  // period from which the lineage is being reported.
  google.protobuf.Timestamp start_time = 6
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The end of the transformation which resulted in this lineage
  // event.  For streaming scenarios, it should be the end of the period from
  // which the lineage is being reported.
  google.protobuf.Timestamp end_time = 7
      [(google.api.field_behavior) = OPTIONAL];
}

// A lineage between source and target entities.
message EventLink {
  // Required. Reference to the source entity
  EntityReference source = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. Reference to the target entity
  EntityReference target = 2 [(google.api.field_behavior) = REQUIRED];
}

// The soft reference to everything you can attach a lineage event to.
message EntityReference {
  // Required. Fully Qualified Name of the entity. Useful for referencing
  // entities that aren't represented as GCP resources, for example, tables in
  // Dataproc Metastore API.
  //
  // Examples:
  //
  //   * `bigquery:dataset.project_id.dataset_id`
  //   * `bigquery:table.project_id.dataset_id.table_id`
  //   * `pubsub:project_id.topic_id`
  //   * `dataproc_metastore:projectId.locationId.instanceId.databaseId.tableId`
  string fully_qualified_name = 1 [(google.api.field_behavior) = REQUIRED];
}

// Metadata describing the operation.
message OperationMetadata {
  // An enum with the state of the operation.
  enum State {
    // Unused.
    STATE_UNSPECIFIED = 0;

    // The operation has been created but is not yet started.
    PENDING = 1;

    // The operation is underway.
    RUNNING = 2;

    // The operation completed successfully.
    SUCCEEDED = 3;

    // The operation is no longer running and did not succeed.
    FAILED = 4;
  }

  // Type of the long running operation.
  enum Type {
    // Unused.
    TYPE_UNSPECIFIED = 0;

    // The resource deletion operation.
    DELETE = 1;
  }

  // Output only. The current operation state.
  State state = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The type of the operation being performed.
  Type operation_type = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The [relative name]
  // (https://cloud.google.com//apis/design/resource_names#relative_resource_name)
  // of the resource being operated on.
  string resource = 3 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The UUID of the resource being operated on.
  string resource_uuid = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The timestamp of the operation submission to the server.
  google.protobuf.Timestamp create_time = 5
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The timestamp of the operation termination, regardless of its
  // success. This field is unset if the operation is still ongoing.
  google.protobuf.Timestamp end_time = 6
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Request message for
// [CreateProcess][google.cloud.datacatalog.lineage.v1.CreateProcess].
message CreateProcessRequest {
  // Required. The name of the project and its location that should own the
  // process.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/Process"
    }
  ];

  // Required. The process to create.
  Process process = 2 [(google.api.field_behavior) = REQUIRED];

  // A unique identifier for this request. Restricted to 36 ASCII characters.
  // A random UUID is recommended. This request is idempotent only if a
  // `request_id` is provided.
  string request_id = 3;
}

// Request message for
// [UpdateProcess][google.cloud.datacatalog.lineage.v1.UpdateProcess].
message UpdateProcessRequest {
  // Required. The lineage process to update.
  //
  // The process's `name` field is used to identify the process to update.
  Process process = 1 [(google.api.field_behavior) = REQUIRED];

  // The list of fields to update. Currently not used. The whole message is
  // updated.
  google.protobuf.FieldMask update_mask = 2;

  // If set to true and the process is not found, the request inserts it.
  bool allow_missing = 3;
}

// Request message for
// [GetProcess][google.cloud.datacatalog.lineage.v1.GetProcess].
message GetProcessRequest {
  // Required. The name of the process to get.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "datalineage.googleapis.com/Process"
    }
  ];
}

// Request message for
// [ListProcesses][google.cloud.datacatalog.lineage.v1.ListProcesses].
message ListProcessesRequest {
  // Required. The name of the project and its location that owns this
  // collection of processes.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/Process"
    }
  ];

  // The maximum number of processes to return. The service may return
  // fewer than this value. If unspecified, at most 50 processes are
  // returned. The maximum value is 100; values greater than 100 are cut to
  // 100.
  int32 page_size = 2;

  // The page token received from a previous `ListProcesses` call. Specify
  // it to get the next page.
  //
  // When paginating, all other parameters specified in this call must
  // match the parameters of the call that provided the page token.
  string page_token = 3;
}

// Response message for
// [ListProcesses][google.cloud.datacatalog.lineage.v1.ListProcesses].
message ListProcessesResponse {
  // The processes from the specified project and location.
  repeated Process processes = 1;

  // The token to specify as `page_token` in the next call to get the next page.
  // If this field is omitted, there are no subsequent pages.
  string next_page_token = 2;
}

// Request message for
// [DeleteProcess][google.cloud.datacatalog.lineage.v1.DeleteProcess].
message DeleteProcessRequest {
  // Required. The name of the process to delete.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "datalineage.googleapis.com/Process"
    }
  ];

  // If set to true and the process is not found, the request
  // succeeds but the server doesn't perform any actions.
  bool allow_missing = 2;
}

// Request message for
// [CreateRun][google.cloud.datacatalog.lineage.v1.CreateRun].
message CreateRunRequest {
  // Required. The name of the process that should own the run.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/Run"
    }
  ];

  // Required. The run to create.
  Run run = 2 [(google.api.field_behavior) = REQUIRED];

  // A unique identifier for this request. Restricted to 36 ASCII characters.
  // A random UUID is recommended. This request is idempotent only if a
  // `request_id` is provided.
  string request_id = 3;
}

// Request message for
// [UpdateRun][google.cloud.datacatalog.lineage.v1.UpdateRun].
message UpdateRunRequest {
  // Required. The lineage run to update.
  //
  // The run's `name` field is used to identify the run to update.
  //
  // Format:
  // `projects/{project}/locations/{location}/processes/{process}/runs/{run}`.
  Run run = 1 [(google.api.field_behavior) = REQUIRED];

  // The list of fields to update. Currently not used. The whole message is
  // updated.
  google.protobuf.FieldMask update_mask = 2;
}

// Request message for
// [GetRun][google.cloud.datacatalog.lineage.v1.GetRun].
message GetRunRequest {
  // Required. The name of the run to get.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "datalineage.googleapis.com/Run" }
  ];
}

// Request message for
// [ListRuns][google.cloud.datacatalog.lineage.v1.ListRuns].
message ListRunsRequest {
  // Required. The name of process that owns this collection of runs.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/Run"
    }
  ];

  // The maximum number of runs to return. The service may return
  // fewer than this value. If unspecified, at most 50 runs are
  // returned. The maximum value is 100; values greater than 100 are cut to
  // 100.
  int32 page_size = 2;

  // The page token received from a previous `ListRuns` call. Specify
  // it to get the next page.
  //
  // When paginating, all other parameters specified in this call must
  // match the parameters of the call that provided the page token.
  string page_token = 3;
}

// Response message for
// [ListRuns][google.cloud.datacatalog.lineage.v1.ListRuns].
message ListRunsResponse {
  // The runs from the specified project and location.
  repeated Run runs = 1;

  // The token to specify as `page_token` in the next call to get the next page.
  // If this field is omitted, there are no subsequent pages.
  string next_page_token = 2;
}

// Request message for
// [DeleteRun][google.cloud.datacatalog.lineage.v1.DeleteRun].
message DeleteRunRequest {
  // Required. The name of the run to delete.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "datalineage.googleapis.com/Run" }
  ];

  // If set to true and the run is not found, the request
  // succeeds but the server doesn't perform any actions.
  bool allow_missing = 2;
}

// Request message for
// [CreateLineageEvent][google.cloud.datacatalog.lineage.v1.CreateLineageEvent].
message CreateLineageEventRequest {
  // Required. The name of the run that should own the lineage event.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/LineageEvent"
    }
  ];

  // Required. The lineage event to create.
  LineageEvent lineage_event = 2 [(google.api.field_behavior) = REQUIRED];

  // A unique identifier for this request. Restricted to 36 ASCII characters.
  // A random UUID is recommended. This request is idempotent only if a
  // `request_id` is provided.
  string request_id = 3;
}

// Request message for
// [GetLineageEvent][google.cloud.datacatalog.lineage.v1.GetLineageEvent].
message GetLineageEventRequest {
  // Required. The name of the lineage event to get.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "datalineage.googleapis.com/LineageEvent"
    }
  ];
}

// Request message for
// [ListLineageEvents][google.cloud.datacatalog.lineage.v1.ListLineageEvents].
message ListLineageEventsRequest {
  // Required. The name of the run that owns the collection of lineage events to
  // get.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/LineageEvent"
    }
  ];

  // The maximum number of lineage events to return.
  //
  // The service may return fewer events than this value.
  // If unspecified, at most 50 events are returned. The maximum value is 100;
  // values greater than 100 are cut to 100.
  int32 page_size = 2;

  // The page token received from a previous `ListLineageEvents` call. Specify
  // it to get the next page.
  //
  // When paginating, all other parameters specified in this call must
  // match the parameters of the call that provided the page token.
  string page_token = 3;
}

// Response message for
// [ListLineageEvents][google.cloud.datacatalog.lineage.v1.ListLineageEvents].
message ListLineageEventsResponse {
  // Lineage events from the specified project and location.
  repeated LineageEvent lineage_events = 1;

  // The token to specify as `page_token` in the next call to get the next page.
  // If this field is omitted, there are no subsequent pages.
  string next_page_token = 2;
}

// Request message for
// [DeleteLineageEvent][google.cloud.datacatalog.lineage.v1.DeleteLineageEvent].
message DeleteLineageEventRequest {
  // Required. The name of the lineage event to delete.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "datalineage.googleapis.com/LineageEvent"
    }
  ];

  // If set to true and the lineage event is not found, the request
  // succeeds but the server doesn't perform any actions.
  bool allow_missing = 2;
}

// Request message for
// [SearchLinks][google.cloud.datacatalog.lineage.v1.Lineage.SearchLinks].
message SearchLinksRequest {
  // Required. The project and location you want search in the format `projects/*/locations/*`
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/Process"
    }
  ];

  // The asset for which you want to retrieve links.
  oneof criteria {
    // Optional. Send asset information in the **source** field to retrieve all
    // links that lead from the specified asset to downstream assets.
    EntityReference source = 4 [(google.api.field_behavior) = OPTIONAL];

    // Optional. Send asset information in the **target** field to retrieve all
    // links that lead from upstream assets to the specified asset.
    EntityReference target = 5 [(google.api.field_behavior) = OPTIONAL];
  }

  // Optional. The maximum number of links to return in a single page of the
  // response. A page may contain fewer links than this value. If unspecified,
  // at most 10 links are returned.
  //
  // Maximum value is 100; values greater than 100 are reduced to 100.
  int32 page_size = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The page token received from a previous `SearchLinksRequest`
  // call. Use it to get the next page.
  //
  // When requesting subsequent pages of a response, remember that
  // all parameters must match the values you provided
  // in the original request.
  string page_token = 3 [(google.api.field_behavior) = OPTIONAL];
}

// Response message for
// [SearchLinks][google.cloud.datacatalog.lineage.v1.Lineage.SearchLinks].
message SearchLinksResponse {
  // The list of links for a given asset. Can be empty if the asset has no
  // relations of requested type (source or target).
  repeated Link links = 1;

  // The token to specify as `page_token` in the subsequent call to get the next
  // page. Omitted if there are no more pages in the response.
  string next_page_token = 2;
}

// Links represent the data flow between **source** (upstream)
// and **target** (downstream) assets in transformation pipelines.
//
// Links are created when LineageEvents record data transformation between
// related assets.
message Link {
  // Output only. Immutable. The name of the link. Format:
  // `projects/{project}/locations/{location}/links/{link}`.
  string name = 1 [
    (google.api.field_behavior) = OUTPUT_ONLY,
    (google.api.field_behavior) = IMMUTABLE
  ];

  // The pointer to the entity that is the **source** of this link.
  EntityReference source = 2;

  // The pointer to the entity that is the **target** of this link.
  EntityReference target = 3;

  // The start of the first event establishing this link.
  google.protobuf.Timestamp start_time = 4;

  // The end of the last event establishing this link.
  google.protobuf.Timestamp end_time = 5;
}

// Request message for
// [BatchSearchLinkProcesses][google.cloud.datacatalog.lineage.v1.Lineage.BatchSearchLinkProcesses].
message BatchSearchLinkProcessesRequest {
  // Required. The project and location you want search in the format `projects/*/locations/*`
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "datalineage.googleapis.com/Process"
    }
  ];

  // Required. An array of links to check for their associated LineageProcesses.
  //
  // The maximum number of items in this array is 100.
  // If the request contains more than 100 links, it returns the
  // `INVALID_ARGUMENT` error.
  //
  // Format: `projects/{project}/locations/{location}/links/{link}`.
  repeated string links = 2 [(google.api.field_behavior) = REQUIRED];

  // The maximum number of processes to return in a single page of the response.
  // A page may contain fewer results than this value.
  int32 page_size = 3;

  // The page token received from a previous `BatchSearchLinkProcesses` call.
  // Use it to get the next page.
  //
  // When requesting subsequent pages of a response, remember that
  // all parameters must match the values you provided
  // in the original request.
  string page_token = 4;
}

// Response message for
// [BatchSearchLinkProcesses][google.cloud.datacatalog.lineage.v1.Lineage.BatchSearchLinkProcesses].
message BatchSearchLinkProcessesResponse {
  // An array of processes associated with the specified links.
  repeated ProcessLinks process_links = 1;

  // The token to specify as `page_token` in the subsequent call to get the next
  // page. Omitted if there are no more pages in the response.
  string next_page_token = 2;
}

// Links associated with a specific process.
message ProcessLinks {
  // The process name in the format of
  // `projects/{project}/locations/{location}/processes/{process}`.
  string process = 1 [(google.api.resource_reference) = {
    type: "datalineage.googleapis.com/Process"
  }];

  // An array containing link details objects of the links provided in
  // the original request.
  //
  // A single process can result in creating multiple links.
  // If any of the links you provide in the request are created by
  // the same process, they all are included in this array.
  repeated ProcessLinkInfo links = 2;
}

// Link details.
message ProcessLinkInfo {
  // The name of the link in the format of
  // `projects/{project}/locations/{location}/links/{link}`.
  string link = 1;

  // The start of the first event establishing this link-process tuple.
  google.protobuf.Timestamp start_time = 2;

  // The end of the last event establishing this link-process tuple.
  google.protobuf.Timestamp end_time = 3;
}

// Origin of a process.
message Origin {
  // Type of the source of a process.
  enum SourceType {
    // Source is Unspecified
    SOURCE_TYPE_UNSPECIFIED = 0;

    // A custom source
    CUSTOM = 1;

    // BigQuery
    BIGQUERY = 2;

    // Data Fusion
    DATA_FUSION = 3;

    // Composer
    COMPOSER = 4;

    // Looker Studio
    LOOKER_STUDIO = 5;
  }

  // Type of the source.
  SourceType source_type = 1;

  // If the source_type isn't CUSTOM, the value of this field should be a GCP
  // resource name of the system, which reports lineage. The project and
  // location parts of the resource name must match the project and location of
  // the lineage resource being created. Examples:
  //
  // - `{source_type: COMPOSER, name:
  //   "projects/foo/locations/us/environments/bar"}`
  // - `{source_type: BIGQUERY, name: "projects/foo/locations/eu"}`
  // - `{source_type: CUSTOM,   name: "myCustomIntegration"}`
  string name = 2;
}