A2A Protocol

examples/a2a_frontend_demo.py

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+"""Local frontend demo, using the actual framework A2A adapter and SDK.
+
+From the framework root:
+  pip install -e 'libs/agent_framework[a2a]' uvicorn
+  uvicorn examples.a2a_frontend_demo:app --host 127.0.0.1 --port 8000
+
+This demo simulates business processing; it never calls OCI or an external tool.
+"""
+import asyncio
+import os
+from pathlib import Path
+from types import SimpleNamespace
+
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+from agent_framework.a2a.server import install_backend_a2a
+from agent_framework.a2a.progress import report_progress
+
+app = FastAPI(title='Agent Framework · A2A Frontend Demo')
+
+
+async def demo_agent(request):
+    text = request['payload']['message']
+    await report_progress('workflow.started', {'agent': request.get('agent_id') or 'demo'})
+    await asyncio.sleep(1)
+    if text.strip().lower() == '/erro':
+        raise RuntimeError('Simulated demo error')
+    if text.strip().lower() == '/lento':
+        await asyncio.sleep(20)
+    await report_progress('workflow.completed', {'agent': 'demo'})
+    if text.strip().lower() == '/confirmar':
+        return {'text': 'Deseja continuar com a demonstração? Responda sim para prosseguir.',
+                'metadata': {'a2a_task_state': 'input-required', 'agent_id': 'demo'}}
+    return {'text': f'Recebi sua mensagem: “{text}”.\n\nA tarefa A2A foi concluída. Este exemplo usa o adaptador real do framework, com processamento de negócio simulado.',
+            'session_id': request['session_id'], 'metadata': {'agent_id': 'demo'}}
+
+
+profiles = SimpleNamespace(list_profiles=lambda: [SimpleNamespace(
+    agent_id='demo', name='Agente de demonstração', description='Exemplo local de agente A2A assíncrono')])
+settings = SimpleNamespace(A2A_PUBLIC_URL=os.getenv('A2A_PUBLIC_URL', 'http://localhost:8000'),
+    A2A_TASK_MODE=True, A2A_TASK_TIMEOUT_SECONDS=60, A2A_SECURITY_SCHEMES={}, A2A_SECURITY=[], APP_NAME='Agente de demonstração')
+install_backend_a2a(app, demo_agent, profiles, settings)
+app.mount('/', StaticFiles(directory=Path(__file__).resolve().parents[1] / 'apps' / 'agent_frontend_a2a', html=True), name='frontend')