Add Links to HistoryEvent

openapi/openapiv2.json

@@ -4733,6 +4733,23 @@
         }
       }
     },
+    "LinkWorkflowEvent": {
+      "type": "object",
+      "properties": {
+        "namespace": {
+          "type": "string"
+        },
+        "workflowId": {
+          "type": "string"
+        },
+        "runId": {
+          "type": "string"
+        },
+        "eventRef": {
+          "$ref": "#/definitions/WorkflowEventEventReference"
+        }
+      }
+    },
     "OperatorServiceUpdateNexusEndpointBody": {
       "type": "object",
       "properties": {
@@ -4751,6 +4768,13 @@
       "properties": {
         "operationId": {
           "type": "string"
+        },
+        "links": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/apinexusv1Link"
+          }
         }
       },
       "description": "The operation will complete asynchronously.\nThe returned ID can be used to reference this operation."
@@ -4877,6 +4901,18 @@
       },
       "description": "Replaces the routing rule with the given source Build ID."
     },
+    "WorkflowEventEventReference": {
+      "type": "object",
+      "properties": {
+        "eventId": {
+          "type": "string",
+          "format": "int64"
+        },
+        "eventType": {
+          "$ref": "#/definitions/v1EventType"
+        }
+      }
+    },
     "WorkflowServiceCreateScheduleBody": {
       "type": "object",
       "properties": {
@@ -5469,6 +5505,14 @@
         "userMetadata": {
           "$ref": "#/definitions/v1UserMetadata",
           "description": "Metadata on the workflow if it is started. This is carried over to the WorkflowExecutionInfo\nfor use by user interfaces to display the fixed as-of-start summary and details of the\nworkflow."
+        },
+        "links": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/apicommonv1Link"
+          },
+          "description": "Links to be associated with the workflow."
         }
       }
     },
@@ -5609,6 +5653,15 @@
         }
       }
     },
+    "apicommonv1Link": {
+      "type": "object",
+      "properties": {
+        "workflowEvent": {
+          "$ref": "#/definitions/LinkWorkflowEvent"
+        }
+      },
+      "description": "Link can be associated with history events. It might contain information about an external entity\nrelated to the history event. For example, workflow A makes a Nexus call that starts workflow B:\nin this case, a history event in workflow A could contain a Link to the workflow started event in\nworkflow B, and vice-versa."
+    },
     "apifailurev1Failure": {
       "type": "object",
       "properties": {
@@ -5677,6 +5730,18 @@
       },
       "title": "A general purpose failure message.\nSee: https://github.com/nexus-rpc/api/blob/main/SPEC.md#failure"
     },
+    "apinexusv1Link": {
+      "type": "object",
+      "properties": {
+        "url": {
+          "type": "string",
+          "description": "See https://github.com/nexus-rpc/api/blob/main/SPEC.md#links."
+        },
+        "type": {
+          "type": "string"
+        }
+      }
+    },
     "apinexusv1Request": {
       "type": "object",
       "properties": {
@@ -7627,6 +7692,14 @@
           "$ref": "#/definitions/v1UserMetadata",
           "description": "Metadata on the event. This is often carried over from commands and client calls. Most events\nwon't have this information, and how this information is used is dependent upon the interface\nthat reads it.\n\nCurrent well-known uses:\n * workflow_execution_started_event_attributes - summary and details from start workflow.\n * timer_started_event_attributes - summary represents an identifier for the timer for use by\n   user interfaces."
         },
+        "links": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/apicommonv1Link"
+          },
+          "description": "Links associated with the event."
+        },
         "workflowExecutionStartedEventAttributes": {
           "$ref": "#/definitions/v1WorkflowExecutionStartedEventAttributes"
         },
@@ -10358,6 +10431,14 @@
             "type": "string"
           },
           "description": "Header that is expected to be attached to the callback request when the operation completes."
+        },
+        "links": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/apinexusv1Link"
+          },
+          "description": "Links contain caller information and can be attached to the operations started by the handler."
         }
       },
       "description": "A request to start an operation."
@@ -10494,6 +10575,14 @@
         "userMetadata": {
           "$ref": "#/definitions/v1UserMetadata",
           "description": "Metadata on the workflow if it is started. This is carried over to the WorkflowExecutionInfo\nfor use by user interfaces to display the fixed as-of-start summary and details of the\nworkflow."
+        },
+        "links": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/apicommonv1Link"
+          },
+          "description": "Links to be associated with the workflow."
         }
       }
     },

openapi/openapiv3.yaml

@@ -5635,6 +5635,11 @@ components:
               * workflow_execution_started_event_attributes - summary and details from start workflow.
               * timer_started_event_attributes - summary represents an identifier for the timer for use by
                 user interfaces.
+        links:
+          type: array
+          items:
+            $ref: '#/components/schemas/Link'
+          description: Links associated with the event.
         workflowExecutionStartedEventAttributes:
           $ref: '#/components/schemas/WorkflowExecutionStartedEventAttributes'
         workflowExecutionCompletedEventAttributes:
@@ -5783,6 +5788,27 @@ components:
          xx:19:00. An interval of 28 days with phase zero would match
          2022-02-17T00:00:00Z (among other times). The same interval with a phase of 3
          days, 5 hours, and 23 minutes would match 2022-02-20T05:23:00Z instead.
+    Link:
+      type: object
+      properties:
+        workflowEvent:
+          $ref: '#/components/schemas/Link_WorkflowEvent'
+      description: |-
+        Link can be associated with history events. It might contain information about an external entity
+         related to the history event. For example, workflow A makes a Nexus call that starts workflow B:
+         in this case, a history event in workflow A could contain a Link to the workflow started event in
+         workflow B, and vice-versa.
+    Link_WorkflowEvent:
+      type: object
+      properties:
+        namespace:
+          type: string
+        workflowId:
+          type: string
+        runId:
+          type: string
+        eventRef:
+          $ref: '#/components/schemas/WorkflowEvent_EventReference'
     ListArchivedWorkflowExecutionsResponse:
       type: object
       properties:
@@ -8043,6 +8069,11 @@ components:
             Metadata on the workflow if it is started. This is carried over to the WorkflowExecutionInfo
              for use by user interfaces to display the fixed as-of-start summary and details of the
              workflow.
+        links:
+          type: array
+          items:
+            $ref: '#/components/schemas/Link'
+          description: Links to be associated with the workflow.
     StartWorkflowExecutionResponse:
       type: object
       properties:
@@ -8670,6 +8701,70 @@ components:
             If set, the worker is opting in to worker versioning. Otherwise, this is used only as a
              marker for workflow reset points and the BuildIDs search attribute.
       description: Identifies the version(s) of a worker that processed a task
+    WorkflowEvent_EventReference:
+      type: object
+      properties:
+        eventId:
+          type: string
+        eventType:
+          enum:
+            - EVENT_TYPE_UNSPECIFIED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_STARTED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_COMPLETED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_FAILED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_TIMED_OUT
+            - EVENT_TYPE_WORKFLOW_TASK_SCHEDULED
+            - EVENT_TYPE_WORKFLOW_TASK_STARTED
+            - EVENT_TYPE_WORKFLOW_TASK_COMPLETED
+            - EVENT_TYPE_WORKFLOW_TASK_TIMED_OUT
+            - EVENT_TYPE_WORKFLOW_TASK_FAILED
+            - EVENT_TYPE_ACTIVITY_TASK_SCHEDULED
+            - EVENT_TYPE_ACTIVITY_TASK_STARTED
+            - EVENT_TYPE_ACTIVITY_TASK_COMPLETED
+            - EVENT_TYPE_ACTIVITY_TASK_FAILED
+            - EVENT_TYPE_ACTIVITY_TASK_TIMED_OUT
+            - EVENT_TYPE_ACTIVITY_TASK_CANCEL_REQUESTED
+            - EVENT_TYPE_ACTIVITY_TASK_CANCELED
+            - EVENT_TYPE_TIMER_STARTED
+            - EVENT_TYPE_TIMER_FIRED
+            - EVENT_TYPE_TIMER_CANCELED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_CANCEL_REQUESTED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_CANCELED
+            - EVENT_TYPE_REQUEST_CANCEL_EXTERNAL_WORKFLOW_EXECUTION_INITIATED
+            - EVENT_TYPE_REQUEST_CANCEL_EXTERNAL_WORKFLOW_EXECUTION_FAILED
+            - EVENT_TYPE_EXTERNAL_WORKFLOW_EXECUTION_CANCEL_REQUESTED
+            - EVENT_TYPE_MARKER_RECORDED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_SIGNALED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_TERMINATED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_CONTINUED_AS_NEW
+            - EVENT_TYPE_START_CHILD_WORKFLOW_EXECUTION_INITIATED
+            - EVENT_TYPE_START_CHILD_WORKFLOW_EXECUTION_FAILED
+            - EVENT_TYPE_CHILD_WORKFLOW_EXECUTION_STARTED
+            - EVENT_TYPE_CHILD_WORKFLOW_EXECUTION_COMPLETED
+            - EVENT_TYPE_CHILD_WORKFLOW_EXECUTION_FAILED
+            - EVENT_TYPE_CHILD_WORKFLOW_EXECUTION_CANCELED
+            - EVENT_TYPE_CHILD_WORKFLOW_EXECUTION_TIMED_OUT
+            - EVENT_TYPE_CHILD_WORKFLOW_EXECUTION_TERMINATED
+            - EVENT_TYPE_SIGNAL_EXTERNAL_WORKFLOW_EXECUTION_INITIATED
+            - EVENT_TYPE_SIGNAL_EXTERNAL_WORKFLOW_EXECUTION_FAILED
+            - EVENT_TYPE_EXTERNAL_WORKFLOW_EXECUTION_SIGNALED
+            - EVENT_TYPE_UPSERT_WORKFLOW_SEARCH_ATTRIBUTES
+            - EVENT_TYPE_WORKFLOW_EXECUTION_UPDATE_ADMITTED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_UPDATE_ACCEPTED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_UPDATE_REJECTED
+            - EVENT_TYPE_WORKFLOW_EXECUTION_UPDATE_COMPLETED
+            - EVENT_TYPE_WORKFLOW_PROPERTIES_MODIFIED_EXTERNALLY
+            - EVENT_TYPE_ACTIVITY_PROPERTIES_MODIFIED_EXTERNALLY
+            - EVENT_TYPE_WORKFLOW_PROPERTIES_MODIFIED
+            - EVENT_TYPE_NEXUS_OPERATION_SCHEDULED
+            - EVENT_TYPE_NEXUS_OPERATION_STARTED
+            - EVENT_TYPE_NEXUS_OPERATION_COMPLETED
+            - EVENT_TYPE_NEXUS_OPERATION_FAILED
+            - EVENT_TYPE_NEXUS_OPERATION_CANCELED
+            - EVENT_TYPE_NEXUS_OPERATION_TIMED_OUT
+            - EVENT_TYPE_NEXUS_OPERATION_CANCEL_REQUESTED
+          type: string
+          format: enum
     WorkflowExecution:
       type: object
       properties:

temporal/api/common/v1/message.proto

@@ -35,6 +35,7 @@ import "google/protobuf/duration.proto";
 import "google/protobuf/empty.proto";
 
 import "temporal/api/enums/v1/common.proto";
+import "temporal/api/enums/v1/event_type.proto";
 import "temporal/api/enums/v1/reset.proto";
 
 message DataBlob {
@@ -206,3 +207,30 @@ message Callback {
         Internal internal = 3;
     }
 }
+
+// Link can be associated with history events. It might contain information about an external entity
+// related to the history event. For example, workflow A makes a Nexus call that starts workflow B:
+// in this case, a history event in workflow A could contain a Link to the workflow started event in
+// workflow B, and vice-versa.
+message Link {
+    message WorkflowEvent {
+        message EventReference {
+            int64 event_id = 1;
+            temporal.api.enums.v1.EventType event_type = 2;
+        }
+
+        string namespace = 1;
+        string workflow_id = 2;
+        string run_id = 3;
+
+        // Additional information about the workflow event.
+        // Eg: the caller workflow can send the history event details that made the Nexus call.
+        oneof reference {
+            EventReference event_ref = 100;
+        }
+    }
+
+    oneof variant {
+        WorkflowEvent workflow_event = 1;
+    }
+}

temporal/api/history/v1/message.proto

@@ -922,6 +922,8 @@ message HistoryEvent {
     //  * timer_started_event_attributes - summary represents an identifier for the timer for use by
     //    user interfaces.
     temporal.api.sdk.v1.UserMetadata user_metadata = 301;
+    // Links associated with the event.
+    repeated temporal.api.common.v1.Link links = 302;
     // The event details. The type must match that in `event_type`.
     oneof attributes {
         WorkflowExecutionStartedEventAttributes workflow_execution_started_event_attributes = 6;

temporal/api/nexus/v1/message.proto

@@ -52,6 +52,12 @@ message UnsuccessfulOperationError {
     Failure failure = 2;
 }
 
+message Link {
+    // See https://github.com/nexus-rpc/api/blob/main/SPEC.md#links.
+    string url = 1;
+    string type = 2;
+}
+
 // A request to start an operation.
 message StartOperationRequest {
     // Name of service to start the operation in.
@@ -66,6 +72,8 @@ message StartOperationRequest {
     temporal.api.common.v1.Payload payload = 5;
     // Header that is expected to be attached to the callback request when the operation completes.
     map<string, string> callback_header = 6;
+    // Links contain caller information and can be attached to the operations started by the handler.
+    repeated Link links = 7;
 }
 
 // A request to cancel an operation.
@@ -106,6 +114,7 @@ message StartOperationResponse {
     // The returned ID can be used to reference this operation.
     message Async {
         string operation_id = 1;
+        repeated Link links = 2;
     }
 
     oneof variant {

temporal/api/workflowservice/v1/request_response.proto

@@ -197,6 +197,8 @@ message StartWorkflowExecutionRequest {
     // for use by user interfaces to display the fixed as-of-start summary and details of the
     // workflow.
     temporal.api.sdk.v1.UserMetadata user_metadata = 23;
+    // Links to be associated with the workflow.
+    repeated temporal.api.common.v1.Link links = 24;
 }
 
 message StartWorkflowExecutionResponse {