new node

src/langbot/pkg/workflow/nodes/call_workflow.py

@@ -0,0 +1,85 @@
+"""Call Workflow Node - invoke an existing workflow
+
+Node metadata is loaded from: ../../templates/metadata/nodes/call_workflow.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any, Optional
+
+from langbot_plugin.api.entities.builtin.workflow import ExecutionContext
+
+from ..node import WorkflowNode, workflow_node
+
+
+@workflow_node('call_workflow')
+class CallWorkflowNode(WorkflowNode):
+    """Call workflow node - invoke an existing workflow"""
+
+    category = 'action'
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        if not self.ap:
+            raise RuntimeError('Application instance not available — cannot call workflow')
+
+        # Get workflow reference from config
+        workflow_ref = str(self.get_config('workflow_uuid', '') or '').strip()
+        if not workflow_ref:
+            raise ValueError('No workflow configured for call workflow node')
+
+        # Get workflow definition from service
+        workflow_data = await self.ap.workflow_service.get_workflow(workflow_ref)
+        if workflow_data is None:
+            raise ValueError(f'Workflow not found: {workflow_ref}')
+
+        workflow_uuid = str(workflow_data.get('uuid', '') or '')
+        if not workflow_uuid:
+            raise ValueError(f'Workflow UUID missing for: {workflow_ref}')
+
+        # Build variables to pass to the called workflow
+        variables = dict(inputs.get('variables', {}) or {})
+
+        # Inherit current workflow variables if configured
+        if self.get_config('inherit_variables', True):
+            for key, value in (context.variables or {}).items():
+                if key not in variables:
+                    variables[key] = value
+
+        # Add context markers for debugging
+        variables['_called_from_workflow'] = True
+        variables['_parent_workflow_id'] = context.workflow_id
+        variables['_parent_execution_id'] = context.execution_id
+
+        # Execute the workflow
+        execution_id = await self.ap.workflow_service.execute_workflow(
+            workflow_uuid=workflow_uuid,
+            trigger_type='workflow_call',
+            trigger_data={
+                'variables': variables,
+                'parent_execution_id': context.execution_id,
+            },
+            session_id=context.session_id,
+            user_id=context.user_id,
+            bot_id=context.bot_id,
+        )
+
+        # Get execution result
+        execution = await self.ap.workflow_service.get_execution(execution_id)
+        if execution is None:
+            raise ValueError(f'Execution result not found: {execution_id}')
+
+        # Build result
+        result = {
+            'workflow_uuid': workflow_uuid,
+            'workflow_name': workflow_data.get('name', ''),
+            'execution_id': execution_id,
+            'status': execution.get('status', 'unknown'),
+            'variables': execution.get('variables', {}),
+            'error': execution.get('error'),
+        }
+
+        return {
+            'result': result,
+            'status': execution.get('status', 'unknown'),
+            'error': execution.get('error'),
+        }