Temporal interceptors allow you to customize and extend the behavior of workflows and activities by intercepting and modifying their execution at various points. Interceptors can be used to add cross-cutting concerns, such as logging, security, or monitoring, to your Temporal applications.

This module provides types and functions for defining and composing interceptors for different parts of Temporal workflows and activities.

Types for different types of interceptors:

• WorkflowInboundInterceptor: An interceptor for workflows, invoked for commands sent to workflow execution.
• WorkflowOutboundInterceptor: An interceptor for workflows, invoked for commands sent from a workflow.
• ActivityInboundInterceptor: An interceptor for activities, invoked for commands sent to an activity.
• ActivityOutboundInterceptor: An interceptor for activities, invoked for actions executed by an activity.
• ClientInterceptors: Interceptors for Temporal clients.

Functions for composing interceptors:

• interceptorConvertChildWorkflowHandle: A function for converting child workflow handles within interceptors.

Example usage of interceptors:

• Define a custom interceptor for activities using ActivityInboundInterceptor.

myActivityInterceptor :: ActivityInboundInterceptor
myActivityInterceptor = ActivityInboundInterceptor
  { executeActivity = \input next -> do
      -- Perform custom logic before calling the activity function
      result <- next input
      -- Perform custom logic after the activity function completes
      return result
  }

• Compose multiple interceptors using Semigroup instances.

combinedInterceptor :: Interceptor
combinedInterceptor = bugsnagInterceptor <> encryptionInterceptor <> otelInterceptor

• Provide the interceptors to the Temporal Workflow client and worker.