## Overview Script tasks in our workflow engine enable dynamic data processing and decision making. You can use Script tasks to generate values that serve as inputs to other tasks in your workflow. ## Basic Usage Each Script task requires a unique identifier in the `Task ID` field. Other tasks can access the output from this script by referencing the same ID in their `Input Task ID` field. ## Basic Example ```python # Simple script that returns a value to be used by another task return 500 # This value will be available to any task that references this Script's Task ID ``` ## Returning Complex Data Scripts can return objects to provide structured data to other tasks: ```python # Return an object with multiple values return { 'invoice_amount': 2500, 'user_id': 'a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6', 'training_id': 'q7r8s9t0u1v2w3x4y5z6a7b8c9d0e1f2' } ``` ## Targeting Specific Tasks You can target outputs to specific tasks using the `for_task_id` field within a list structure: ```python # Return different inputs for different tasks return { 'list': { 'items': [ {'invoice_amount': 1000, 'for_task_id': 'create_invoice_1'}, {'invoice_amount': 2000, 'for_task_id': 'create_invoice_2'} ] } } ``` ## Conditional Task Execution Use the `skip` field to conditionally skip tasks. Pass a list of task IDs to this parameter and then set this script as the input to those tasks. If a task ID is found in the `skip` list then it will not be run. ```python # Skip a task based on a condition premium_user = input_task['is_premium'] # Assumes an input task calculated this. if premium_user: return {'skip': ['charge_fee_task']} else: return {'invoice_amount': 1500} ``` ## Returning a List of Inputs When you need more advanced control over task execution, you can use the special list output format. This powerful feature allows a single Script task to: - Provide inputs to multiple downstream tasks - Run the same task multiple times with different inputs - Selectively target specific tasks by ID - Conditionally skip certain tasks The structure follows this pattern: ```python return { 'list': { 'items': [ # Each item in this array can be an input to a task {'field1': 'value1', 'field2': 'value2', 'for_task_id': 'specific_task_id'}, {'field1': 'value3', 'field2': 'value4'} # No for_task_id means available to any task ] } } ``` The `for_task_id` field is optional and specifies which task should receive this particular input. When multiple inputs would run on the same task, that task is run multiple times (once for each input). A single script can compute the inputs to multiple tasks by returning a list of inputs that each have a `for_task_id` field and then setting that script as the input task to each subsequent task. ## Workflow Context ### Subscription Workflows Subscription workflow scripts have access to a `workflow` context variable of the following shape: #### `outputs` ```python [ { "success": , "task_id": , "type": , "value": { "result": # The output of this task (varies) } }, ... ] ``` #### `workflow` ```python { 'for_date': , # The date this is running 'manual_run': , # Wheather this triggered manually or automatically 'user': { 'bot': , 'display_name': , 'email': , 'user_id': } } ``` ### Trigger Workflows Trigger workflow scripts have access to a `workflow` context variable of the following shape: #### `outputs` ```python [ { "success": , "task_id": , "type": , "value": { "result": # The output of this task (varies) } }, ... ] ``` #### `workflow` ```python { 'manual_run': , # Whether or not this was triggered manually in a test } ``` #### `reservation` A full reservation dictionary for the reservation that triggered this workflow. ## Task-Specific Input Formats ### Create a Credential Record Assigns credentials to users, typically after completing training or certification programs. ```python return { 'duration': 86400, # Duration in seconds (24 hours) 'training_id': 'a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6', 'user_id': 'q7r8s9t0u1v2w3x4y5z6a7b8c9d0e1f2', 'invoice_amount': 9900, # $99.00 'meta_data': {'level': 'intermediate', 'expires': '2023-12-31'} } ``` ### Create an Invoice Item Adds a single line item to an invoice for billing purposes. ```python return { 'invoice_amount': 5000 # $50.00 } ``` ### Credit or Debit User's Account Adjusts a user's account balance by adding or removing funds. ```python return { 'amount_cents': 2500, # $25.00 credit 'create_account_if_needed': True, 'note': 'Referral bonus', 'user_id': 'a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6' } ``` ### Emit a Webhook Sends HTTP requests to external systems to trigger actions or share data. ```python return { 'url': 'https://api.example.com/webhooks/process', 'method': 'post', 'body': '{"status": "completed", "order_id": "order_123"}', 'headers': [ {'name': 'Content-Type', 'value': 'application/json'}, {'name': 'X-API-Key', 'value': 'secret_key_123'} ], 'username': 'api_user', 'password': 'api_password' } ``` ### Generate an Invoice Creates a complete invoice for a user based on their reservations or activities. ```python return { 'reservation_ids': ['a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6', 'q7r8s9t0u1v2w3x4y5z6a7b8c9d0e1f2'], 'bill_to_user_id': 'g3h4i5j6k7l8m9n0p1q2r3s4t5u6v7w8', 'memo': 'Training services provided in Q3', 'payment_instructions': 'Due within 30 days', 'invoice_number_prefix': 'TRAIN-' } ``` ### Run a Script Executes custom logic to transform data or make decisions based on workflow inputs. ```python # Access data from a previous Script task previous_amount = input_task['amount'] return { 'new_amount': previous_amount * 1.1 # Add 10% } ``` ### Send a Slack Message Delivers notifications to users or channels in Slack for real-time updates. ```python return { 'channel': 'team-updates', 'user': 'john.doe@example.com', 'users': ['alice@example.com', 'bob@example.com'], 'text': 'Training certificate issued: {certificate_id}', 'vars': { 'certificate_id': 'CERT-001-2023' } } ``` ### Send an Email Sends customized emails to users with variable content. ```python return { 'recipient_id': 'a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6', 'cc_ids': ['q7r8s9t0u1v2w3x4y5z6a7b8c9d0e1f2', 'g3h4i5j6k7l8m9n0p1q2r3s4t5u6v7w8'], 'bcc_ids': ['x9y0z1a2b3c4d5e6f7g8h9i0j1k2l3m4'], 'subject': 'Your Training Certificate', 'body': 'Congratulations, {name}! Your certificate is ready.', 'vars': { 'name': 'John Doe' } } ``` ### Update a Custom Property Modifies property values associated with users or resources in the system. ```python return { 'property_name': 'Certification Level', 'reservable_id': 'a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6', 'value': 'advanced' } ``` ## Advanced Example: Multiple Task Execution This example shows how a single Script task can drive multiple downstream tasks: ```python user_id = 'a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6' is_premium = True # Prepare outputs for multiple tasks outputs = [] # Always send confirmation email outputs.append({ 'recipient_id': user_id, 'subject': 'Registration Confirmed', 'body': 'Thank you for registering!', 'for_task_id': 'send_email_task' }) # Conditionally apply credits for premium users if is_premium: outputs.append({ 'amount_cents': 5000, 'user_id': user_id, 'note': 'Premium member bonus', 'for_task_id': 'credit_account_task' }) # Return all outputs return { 'list': { 'items': outputs } } ``` ## Best Practices 1. Give Script tasks descriptive IDs that indicate their purpose 2. Keep scripts simple and focused on a single responsibility 3. Use comments to document complex logic 4. Test your scripts with various inputs to ensure they behave as expected 5. Consider error handling for important workflows

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