feat: Add n8n bidirectional integration with agent invoke API

examples/python/n8n_integration_example.py

@@ -0,0 +1,337 @@
+"""Complete n8n Integration Example for PraisonAI
+
+This example demonstrates the complete bidirectional n8n ↔ PraisonAI integration:
+
+1. PraisonAI → n8n: Agents executing n8n workflows (using PraisonAI-Tools)
+2. n8n → PraisonAI: n8n workflows invoking PraisonAI agents (using API endpoint)
+
+Prerequisites:
+1. Install dependencies:
+   pip install "praisonai-tools[n8n]" fastapi uvicorn
+
+2. Set up n8n instance:
+   docker run -it --rm --name n8n -p 5678:5678 -v n8n_data:/home/node/.n8n docker.n8n.io/n8nio/n8n
+
+3. Environment variables:
+   export N8N_URL="http://localhost:5678"
+   export N8N_API_KEY="your-api-key"  # optional for local testing
+
+Usage:
+    python examples/python/n8n_integration_example.py
+"""
+
+import os
+import asyncio
+import uvicorn
+from fastapi import FastAPI
+from praisonaiagents import Agent
+
+
+def setup_praisonai_agents():
+    """Set up PraisonAI agents with n8n tools."""
+    print("🚀 Setting up PraisonAI agents with n8n capabilities...")
+
+    try:
+        from praisonai_tools.n8n import n8n_workflow, n8n_list_workflows
+
+        # Create automation agent with n8n tools
+        automation_agent = Agent(
+            name="automation-agent",
+            instructions="""
+            You are an automation specialist with access to n8n's 400+ integrations.
+            You can help users automate workflows across platforms like:
+
+            - Communication: Slack, Discord, Telegram, Gmail, Teams
+            - Productivity: Notion, Google Sheets, Airtable, Trello
+            - Databases: PostgreSQL, MongoDB, MySQL, Redis
+            - APIs: REST, GraphQL, webhooks
+
+            When asked to perform automation tasks:
+            1. First list available n8n workflows if needed
+            2. Execute the appropriate workflow with the provided data
+            3. Explain what the workflow accomplished
+
+            Always be helpful and provide clear explanations.
+            """,
+            tools=[n8n_workflow, n8n_list_workflows],
+            llm="gpt-4o-mini"
+        )
+
+        # Create notification agent focused on messaging
+        notification_agent = Agent(
+            name="notification-agent", 
+            instructions="""
+            You specialize in sending notifications and messages across platforms.
+            You have access to n8n workflows for various messaging platforms.
+
+            When asked to send notifications:
+            1. Determine the best platform for the message
+            2. Use appropriate n8n workflow for that platform
+            3. Include relevant context and formatting
+
+            Be efficient and reliable with notifications.
+            """,
+            tools=[n8n_workflow],
+            llm="gpt-4o-mini"
+        )
+
+        return {
+            "automation": automation_agent,
+            "notification": notification_agent
+        }
+
+    except ImportError as e:
+        print(f"❌ Error importing n8n tools: {e}")
+        print("💡 Install with: pip install 'praisonai-tools[n8n]'")
+        return {}
+
+
+def setup_api_server_with_agents(agents):
+    """Set up FastAPI server with agent invoke endpoints."""
+    print("🌐 Setting up API server for n8n → PraisonAI integration...")
+
+    from praisonai.api.agent_invoke import register_agent, router
+
+    # Create FastAPI app
+    app = FastAPI(
+        title="PraisonAI n8n Integration Server",
+        description="API server for n8n to invoke PraisonAI agents",
+        version="1.0.0"
+    )
+
+    # Include agent invoke router
+    app.include_router(router)
+
+    # Register agents
+    for agent_id, agent in agents.items():
+        register_agent(agent_id, agent)
+        print(f"📋 Registered agent: {agent_id}")
+
+    @app.get("/")
+    async def root():
+        """Root endpoint with integration information."""
+        return {
+            "message": "PraisonAI n8n Integration Server",
+            "available_agents": list(agents.keys()),
+            "endpoints": {
+                "invoke_agent": "/api/v1/agents/{agent_id}/invoke",
+                "list_agents": "/api/v1/agents",
+                "agent_info": "/api/v1/agents/{agent_id}"
+            },
+            "n8n_integration": {
+                "description": "Use HTTP Request node in n8n to invoke agents",
+                "example_url": "http://localhost:8000/api/v1/agents/automation/invoke",
+                "example_body": {
+                    "message": "Send a Slack message to #general saying 'Hello from n8n!'",
+                    "session_id": "n8n-workflow-123"
+                }
+            }
+        }
+
+    return app
+
+
+async def demo_praisonai_to_n8n(agents):
+    """Demonstrate PraisonAI agents calling n8n workflows."""
+    print("\n🔄 Demo: PraisonAI → n8n Integration")
+    print("=" * 50)
+
+    if not agents:
+        print("❌ No agents available for demo")
+        return
+
+    automation_agent = agents.get("automation")
+    if not automation_agent:
+        print("❌ Automation agent not available")
+        return
+
+    try:
+        print("📋 Testing agent with n8n workflow listing...")
+        response = automation_agent.start(
+            "Can you list the available n8n workflows?"
+        )
+        print(f"🤖 Agent: {response}")
+
+        print("\n🚀 Testing workflow execution...")
+        response = automation_agent.start(
+            "I need to send a notification that our deployment was successful. "
+            "Can you help me send this via Slack to the #deployments channel?"
+        )
+        print(f"🤖 Agent: {response}")
+
+    except Exception as e:
+        print(f"❌ Demo error: {e}")
+
+
+async def demo_n8n_to_praisonai():
+    """Demonstrate n8n invoking PraisonAI agents via HTTP."""
+    print("\n🔄 Demo: n8n → PraisonAI Integration")
+    print("=" * 50)
+
+    try:
+        import httpx
+
+        # Simulate n8n HTTP Request node call
+        print("📡 Simulating n8n HTTP Request node call...")
+
+        async with httpx.AsyncClient() as client:
+            response = await client.post(
+                "http://localhost:8000/api/v1/agents/notification/invoke",
+                json={
+                    "message": "A new user has signed up: john@example.com. Please send a welcome email.",
+                    "session_id": "n8n-user-signup-workflow"
+                },
+                timeout=30.0
+            )
+
+            if response.status_code == 200:
+                data = response.json()
+                print(f"✅ Success: {data['result']}")
+                print(f"📊 Session: {data['session_id']}")
+            else:
+                print(f"❌ Error: {response.status_code} - {response.text}")
+
+    except httpx.ConnectError:
+        print("❌ Connection error: Make sure the API server is running")
+        print("💡 Start server in another terminal: python examples/python/n8n_integration_example.py --server")
+    except Exception as e:
+        print(f"❌ Demo error: {e}")
+
+
+def create_n8n_workflow_examples():
+    """Show examples of n8n workflow configurations."""
+    print("\n📝 n8n Workflow Configuration Examples")
+    print("=" * 50)
+
+    print("""
+🔹 HTTP Request Node (n8n → PraisonAI):
+   Method: POST
+   URL: http://localhost:8000/api/v1/agents/automation/invoke
+   Body:
+   {
+     "message": "{{ $json.user_message }}",
+     "session_id": "{{ $json.session_id || workflow.id }}"
+   }
+
+🔹 Webhook Trigger for PraisonAI response:
+   URL: http://localhost:8000/webhook/praisonai-response
+   Method: POST
+
+🔹 Slack notification after agent response:
+   Channel: {{ $json.channel || '#general' }}
+   Message: Agent response: {{ $json.agent_result }}
+""")
+
+
+async def run_interactive_demo():
+    """Run interactive demo of the integration."""
+    print("\n🎮 Interactive Demo")
+    print("=" * 20)
+
+    # Set up agents
+    agents = setup_praisonai_agents()
+    if not agents:
+        print("❌ Cannot run interactive demo without agents")
+        return
+
+    automation_agent = agents.get("automation")
+    if not automation_agent:
+        print("❌ Automation agent not available")
+        return
+
+    print("💬 Chat with the automation agent (type 'quit' to exit)")
+    print("💡 Try: 'List available n8n workflows'")
+    print("💡 Try: 'Send a Slack message to #general'")
+
+    while True:
+        try:
+            user_input = input("\n👤 You: ").strip()
+            if user_input.lower() in ['quit', 'exit', 'q']:
+                break
+
+            if not user_input:
+                continue
+
+            print("🤖 Agent: ", end="", flush=True)
+            response = automation_agent.start(user_input)
+            print(response)
+
+        except KeyboardInterrupt:
+            print("\n👋 Goodbye!")
+            break
+        except Exception as e:
+            print(f"\n❌ Error: {e}")
+
+
+def run_server(port=8000):
+    """Run the API server for n8n integration."""
+    print(f"\n🚀 Starting PraisonAI n8n Integration Server on port {port}...")
+
+    # Set up agents
+    agents = setup_praisonai_agents()
+
+    # Create app
+    app = setup_api_server_with_agents(agents)
+
+    print(f"✅ Server ready at http://localhost:{port}")
+    print(f"📊 Available agents: {list(agents.keys())}")
+    print("\n🔗 n8n HTTP Request Node Configuration:")
+    print(f"   URL: http://localhost:{port}/api/v1/agents/{{agent_id}}/invoke")
+    print("   Method: POST")
+    print('   Body: {"message": "Your message here", "session_id": "optional"}')
+
+    # Run server
+    uvicorn.run(app, host="0.0.0.0", port=port)
+
+
+async def main():
+    """Main function to run demos."""
+    import argparse
+
+    parser = argparse.ArgumentParser(description="PraisonAI n8n Integration Demo")
+    parser.add_argument("--server", action="store_true", help="Run API server")
+    parser.add_argument("--demo", action="store_true", help="Run demos")
+    parser.add_argument("--interactive", action="store_true", help="Run interactive demo")
+    parser.add_argument("--port", type=int, default=8000, help="Server port")
+
+    args = parser.parse_args()
+
+    if args.server:
+        run_server(args.port)
+    elif args.interactive:
+        await run_interactive_demo()
+    elif args.demo:
+        # Set up agents for demos
+        agents = setup_praisonai_agents()
+
+        # Run demos
+        await demo_praisonai_to_n8n(agents)
+        create_n8n_workflow_examples()
+        print("\n💡 To test n8n → PraisonAI, start the server:")
+        print("   python examples/python/n8n_integration_example.py --server")
+        print("   Then run: python examples/python/n8n_integration_example.py --test-api")
+
+    else:
+        # Default: show info and run basic demo
+        print("🔗 PraisonAI ↔ n8n Bidirectional Integration")
+        print("=" * 50)
+
+        print("\n📋 Integration Components:")
+        print("1. 🔧 PraisonAI-Tools: n8n workflow execution tools")
+        print("2. 🌐 API Endpoint: Agent invoke endpoint for n8n")
+        print("3. 🤖 Agents: PraisonAI agents with n8n capabilities")
+
+        print("\n🚀 Available Commands:")
+        print("   --demo        Run integration demos")
+        print("   --server      Start API server for n8n")
+        print("   --interactive Run interactive agent chat")
+
+        # Quick demo
+        agents = setup_praisonai_agents()
+        if agents:
+            await demo_praisonai_to_n8n(agents)
+            create_n8n_workflow_examples()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())