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Add sample chat application with FastAPI (#5433)
Introduce a sample chat application using AgentChat and FastAPI, demonstrating single-agent and team chat functionalities, along with state persistence and conversation history management. Resolves #5423 --------- Co-authored-by: Victor Dibia <victor.dibia@gmail.com> Co-authored-by: Victor Dibia <victordibia@microsoft.com>
This commit is contained in:
Eric Zhu
GitHub
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abdc0da4f1
5
python/samples/agentchat_fastapi/.gitignore
vendored
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5
python/samples/agentchat_fastapi/.gitignore
vendored
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model_config.yaml
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agent_state.json
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agent_history.json
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team_state.json
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team_history.json
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70
python/samples/agentchat_fastapi/README.md
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70
python/samples/agentchat_fastapi/README.md
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# AgentChat App with FastAPI
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This sample demonstrates how to create a simple chat application using
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[AgentChat](https://microsoft.github.io/autogen/stable/user-guide/agentchat-user-guide/index.html)
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and [FastAPI](https://fastapi.tiangolo.com/).
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You will be using the following features of AgentChat:
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1. Agent:
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- `AssistantAgent`
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- `UserProxyAgent` with a custom websocket input function
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2. Team: `RoundRobinGroupChat`
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3. State persistence: `save_state` and `load_state` methods of both agent and team.
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## Setup
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Install the required packages with OpenAI support:
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```bash
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pip install -U "autogen-ext[openai]" "fastapi" "uvicorn" "PyYAML"
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```
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To use models other than OpenAI, see the [Models](https://microsoft.github.io/autogen/stable/user-guide/agentchat-user-guide/tutorial/models.html) documentation.
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Create a new file named `model_config.yaml` in the same directory as this README file to configure your model settings.
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See `model_config_template.yaml` for an example.
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## Chat with a single agent
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To start the FastAPI server for single-agent chat, run:
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```bash
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python app_agent.py
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```
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Visit http://localhost:8001 in your browser to start chatting.
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## Chat with a team of agents
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To start the FastAPI server for team chat, run:
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```bash
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python app_team.py
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```
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Visit http://localhost:8002 in your browser to start chatting.
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The team also includes a `UserProxyAgent` agent with a custom websocket input function
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that allows the user to send messages to the team from the browser.
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The team follows a round-robin strategy so each agent will take turns to respond.
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When it is the user's turn, the input box will be enabled.
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Once the user sends a message, the input box will be disabled and the agents
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will take turns to respond.
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## State persistence
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The agents and team use the `load_state` and `save_state` methods to load and save
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their state from and to files on each turn.
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For the agent, the state is saved to and loaded from `agent_state.json`.
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For the team, the state is saved to and loaded from `team_state.json`.
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You can inspect the state files to see the state of the agents and team
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once you have chatted with them.
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When the server restarts, the agents and team will load their state from the state files
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to maintain their state across restarts.
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Additionally, the apps uses separate JSON files,
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`agent_history.json` and `team_history.json`, to store the conversation history
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for display in the browser.
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195
python/samples/agentchat_fastapi/app_agent.html
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195
python/samples/agentchat_fastapi/app_agent.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>AutoGen FastAPI Sample: Agent</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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margin: 0;
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padding: 0;
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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height: 100vh;
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background-color: #f0f0f0;
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}
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#chat-container {
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width: 90%;
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max-width: 600px;
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background-color: #fff;
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border-radius: 8px;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
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padding: 20px;
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}
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#messages {
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height: 600px;
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overflow-y: auto;
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border-bottom: 1px solid #ddd;
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margin-bottom: 20px;
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}
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.message {
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margin: 10px 0;
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}
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.message.user {
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text-align: right;
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}
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.message.assistant {
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text-align: left;
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}
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.message.error {
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color: #721c24;
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background-color: #f8d7da;
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border: 1px solid #f5c6cb;
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padding: 10px;
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border-radius: 4px;
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margin: 10px 0;
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}
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.message.system {
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color: #0c5460;
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background-color: #d1ecf1;
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border: 1px solid #bee5eb;
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padding: 10px;
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border-radius: 4px;
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margin: 10px 0;
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}
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#input-container input:disabled,
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#input-container button:disabled {
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background-color: #e0e0e0;
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cursor: not-allowed;
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}
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#input-container {
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display: flex;
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}
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#input-container input {
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flex: 1;
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padding: 10px;
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border: 1px solid #ddd;
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border-radius: 4px;
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}
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#input-container button {
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padding: 10px 20px;
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border: none;
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background-color: #007bff;
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color: #fff;
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border-radius: 4px;
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cursor: pointer;
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}
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</style>
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</head>
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<body>
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<div id="chat-container">
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<div id="messages"></div>
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<div id="input-container">
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<input type="text" id="message-input" placeholder="Type a message...">
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<button onclick="sendMessage()">Send</button>
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</div>
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</div>
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<script>
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document.getElementById('message-input').addEventListener('keydown', function (event) {
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if (event.key === 'Enter') {
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sendMessage();
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}
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});
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async function sendMessage() {
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const input = document.getElementById('message-input');
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const button = document.querySelector('#input-container button');
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const message = input.value;
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if (!message) return;
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// Display user message
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displayMessage(message, 'user');
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// Clear input and disable controls
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input.value = '';
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input.disabled = true;
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button.disabled = true;
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try {
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const response = await fetch('http://localhost:8001/chat', {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json'
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},
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body: JSON.stringify({ content: message, source: 'user' })
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});
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const data = await response.json();
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if (!response.ok) {
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// Handle error response
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if (data.detail && data.detail.type === 'error') {
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displayMessage(data.detail.content, 'error');
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} else {
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displayMessage('Error: ' + (data.detail || 'Unknown error'), 'error');
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}
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} else {
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displayMessage(data.content, 'assistant');
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}
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} catch (error) {
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console.error('Error:', error);
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displayMessage('Error: Could not reach the server.', 'error');
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} finally {
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// Re-enable controls
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input.disabled = false;
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button.disabled = false;
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input.focus();
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}
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}
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function displayMessage(content, source) {
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const messagesContainer = document.getElementById('messages');
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const messageElement = document.createElement('div');
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messageElement.className = `message ${source}`;
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const labelElement = document.createElement('span');
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labelElement.className = 'label';
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labelElement.textContent = source;
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const contentElement = document.createElement('div');
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contentElement.className = 'content';
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contentElement.textContent = content;
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messageElement.appendChild(labelElement);
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messageElement.appendChild(contentElement);
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messagesContainer.appendChild(messageElement);
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messagesContainer.scrollTop = messagesContainer.scrollHeight;
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}
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async function loadHistory() {
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try {
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const response = await fetch('http://localhost:8001/history');
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if (!response.ok) {
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throw new Error('Network response was not ok');
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}
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const history = await response.json();
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history.forEach(message => {
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displayMessage(message.content, message.source);
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});
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} catch (error) {
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console.error('Error loading history:', error);
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}
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}
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// Load chat history when the page loads
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window.onload = loadHistory;
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</script>
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</body>
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</html>
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111
python/samples/agentchat_fastapi/app_agent.py
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111
python/samples/agentchat_fastapi/app_agent.py
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import json
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import os
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from typing import Any
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import aiofiles
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import yaml
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from autogen_agentchat.agents import AssistantAgent
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from autogen_agentchat.messages import TextMessage
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from autogen_core import CancellationToken
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from autogen_core.models import ChatCompletionClient
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from fastapi import FastAPI, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import FileResponse
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from fastapi.staticfiles import StaticFiles
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app = FastAPI()
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# Add CORS middleware
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"], # Allows all origins
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allow_credentials=True,
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allow_methods=["*"], # Allows all methods
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allow_headers=["*"], # Allows all headers
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)
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# Serve static files
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app.mount("/static", StaticFiles(directory="."), name="static")
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@app.get("/")
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async def root():
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"""Serve the chat interface HTML file."""
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return FileResponse("app_agent.html")
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model_config_path = "model_config.yaml"
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state_path = "agent_state.json"
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history_path = "agent_history.json"
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async def get_agent() -> AssistantAgent:
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"""Get the assistant agent, load state from file."""
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# Get model client from config.
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async with aiofiles.open(model_config_path, "r") as file:
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model_config = yaml.safe_load(await file.read())
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model_client = ChatCompletionClient.load_component(model_config)
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# Create the assistant agent.
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agent = AssistantAgent(
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name="assistant",
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model_client=model_client,
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system_message="You are a helpful assistant.",
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)
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# Load state from file.
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if not os.path.exists(state_path):
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return agent # Return agent without loading state.
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async with aiofiles.open(state_path, "r") as file:
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state = json.loads(await file.read())
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await agent.load_state(state)
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return agent
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async def get_history() -> list[dict[str, Any]]:
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"""Get chat history from file."""
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if not os.path.exists(history_path):
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return []
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async with aiofiles.open(history_path, "r") as file:
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return json.loads(await file.read())
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@app.get("/history")
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async def history() -> list[dict[str, Any]]:
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try:
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return await get_history()
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except Exception as e:
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raise HTTPException(status_code=500, detail=str(e)) from e
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@app.post("/chat", response_model=TextMessage)
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async def chat(request: TextMessage) -> TextMessage:
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try:
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# Get the agent and respond to the message.
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agent = await get_agent()
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response = await agent.on_messages(messages=[request], cancellation_token=CancellationToken())
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# Save agent state to file.
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state = await agent.save_state()
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async with aiofiles.open(state_path, "w") as file:
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await file.write(json.dumps(state))
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# Save chat history to file.
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history = await get_history()
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history.append(request.model_dump())
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history.append(response.chat_message.model_dump())
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async with aiofiles.open(history_path, "w") as file:
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await file.write(json.dumps(history))
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assert isinstance(response.chat_message, TextMessage)
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return response.chat_message
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except Exception as e:
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error_message = {
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"type": "error",
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"content": f"Error: {str(e)}",
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"source": "system"
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}
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raise HTTPException(status_code=500, detail=error_message) from e
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# Example usage
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if __name__ == "__main__":
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import uvicorn
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uvicorn.run(app, host="0.0.0.0", port=8001)
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217
python/samples/agentchat_fastapi/app_team.html
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217
python/samples/agentchat_fastapi/app_team.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>AutoGen FastAPI Sample: Team</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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margin: 0;
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padding: 0;
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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height: 100vh;
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background-color: #f0f0f0;
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}
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#chat-container {
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width: 90%;
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max-width: 600px;
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background-color: #fff;
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border-radius: 8px;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
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padding: 20px;
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}
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#messages {
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height: 600px;
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overflow-y: auto;
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border-bottom: 1px solid #ddd;
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margin-bottom: 20px;
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}
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.message {
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margin: 10px 0;
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}
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.message.user {
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text-align: right;
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}
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.message.assistant {
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text-align: left;
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}
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.label {
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font-weight: bold;
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display: block;
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}
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.content {
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margin-top: 5px;
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}
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#input-container {
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display: flex;
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}
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#input-container input {
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flex: 1;
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padding: 10px;
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border: 1px solid #ddd;
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border-radius: 4px;
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}
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#input-container button {
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padding: 10px 20px;
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border: none;
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background-color: #007bff;
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color: #fff;
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border-radius: 4px;
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cursor: pointer;
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}
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#input-container input:disabled,
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#input-container button:disabled {
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background-color: #e0e0e0;
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cursor: not-allowed;
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}
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.message.error {
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color: #721c24;
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background-color: #f8d7da;
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border: 1px solid #f5c6cb;
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padding: 10px;
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border-radius: 4px;
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||||
margin: 10px 0;
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}
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||||
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||||
.message.system {
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color: #0c5460;
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||||
background-color: #d1ecf1;
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border: 1px solid #bee5eb;
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||||
padding: 10px;
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||||
border-radius: 4px;
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||||
margin: 10px 0;
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||||
}
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</style>
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</head>
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||||
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<body>
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<div id="chat-container">
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||||
<div id="messages"></div>
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||||
<div id="input-container">
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||||
<input type="text" id="message-input" placeholder="Type a message...">
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||||
<button id="send-button" onclick="sendMessage()">Send</button>
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||||
</div>
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||||
</div>
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||||
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||||
<script>
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||||
const ws = new WebSocket('ws://localhost:8002/ws/chat');
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||||
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||||
ws.onmessage = function (event) {
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||||
const message = JSON.parse(event.data);
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||||
|
||||
if (message.type === 'UserInputRequestedEvent') {
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||||
// Re-enable input and send button if UserInputRequestedEvent is received
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||||
enableInput();
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||||
}
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||||
else if (message.type === 'error') {
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||||
// Display error message
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||||
displayMessage(message.content, 'error');
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||||
enableInput();
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||||
}
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||||
else {
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||||
// Display regular message
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||||
displayMessage(message.content, message.source);
|
||||
}
|
||||
};
|
||||
|
||||
ws.onerror = function(error) {
|
||||
displayMessage("WebSocket error occurred. Please refresh the page.", 'error');
|
||||
enableInput();
|
||||
};
|
||||
|
||||
ws.onclose = function() {
|
||||
displayMessage("Connection closed. Please refresh the page.", 'system');
|
||||
disableInput();
|
||||
};
|
||||
|
||||
document.getElementById('message-input').addEventListener('keydown', function (event) {
|
||||
if (event.key === 'Enter' && !event.target.disabled) {
|
||||
sendMessage();
|
||||
}
|
||||
});
|
||||
|
||||
async function sendMessage() {
|
||||
const input = document.getElementById('message-input');
|
||||
const button = document.getElementById('send-button');
|
||||
const message = input.value;
|
||||
if (!message) return;
|
||||
|
||||
// Clear input and disable input and send button
|
||||
input.value = '';
|
||||
disableInput();
|
||||
|
||||
// Send message to WebSocket
|
||||
ws.send(JSON.stringify({ content: message, source: 'user' }));
|
||||
}
|
||||
|
||||
function displayMessage(content, source) {
|
||||
const messagesContainer = document.getElementById('messages');
|
||||
const messageElement = document.createElement('div');
|
||||
messageElement.className = `message ${source}`;
|
||||
|
||||
const labelElement = document.createElement('span');
|
||||
labelElement.className = 'label';
|
||||
labelElement.textContent = source;
|
||||
|
||||
const contentElement = document.createElement('div');
|
||||
contentElement.className = 'content';
|
||||
contentElement.textContent = content;
|
||||
|
||||
messageElement.appendChild(labelElement);
|
||||
messageElement.appendChild(contentElement);
|
||||
messagesContainer.appendChild(messageElement);
|
||||
messagesContainer.scrollTop = messagesContainer.scrollHeight;
|
||||
}
|
||||
|
||||
function disableInput() {
|
||||
const input = document.getElementById('message-input');
|
||||
const button = document.getElementById('send-button');
|
||||
input.disabled = true;
|
||||
button.disabled = true;
|
||||
}
|
||||
|
||||
function enableInput() {
|
||||
const input = document.getElementById('message-input');
|
||||
const button = document.getElementById('send-button');
|
||||
input.disabled = false;
|
||||
button.disabled = false;
|
||||
}
|
||||
|
||||
async function loadHistory() {
|
||||
try {
|
||||
const response = await fetch('http://localhost:8002/history');
|
||||
if (!response.ok) {
|
||||
throw new Error('Network response was not ok');
|
||||
}
|
||||
const history = await response.json();
|
||||
history.forEach(message => {
|
||||
displayMessage(message.content, message.source);
|
||||
});
|
||||
} catch (error) {
|
||||
console.error('Error loading history:', error);
|
||||
}
|
||||
}
|
||||
|
||||
// Load chat history when the page loads
|
||||
window.onload = loadHistory;
|
||||
</script>
|
||||
</body>
|
||||
|
||||
</html>
|
||||
166
python/samples/agentchat_fastapi/app_team.py
Normal file
166
python/samples/agentchat_fastapi/app_team.py
Normal file
@ -0,0 +1,166 @@
|
||||
import json
|
||||
import logging
|
||||
import os
|
||||
from typing import Any, Awaitable, Callable, Optional
|
||||
|
||||
import aiofiles
|
||||
import yaml
|
||||
from autogen_agentchat.agents import AssistantAgent, UserProxyAgent
|
||||
from autogen_agentchat.base import TaskResult
|
||||
from autogen_agentchat.messages import TextMessage, UserInputRequestedEvent
|
||||
from autogen_agentchat.teams import RoundRobinGroupChat
|
||||
from autogen_core import CancellationToken
|
||||
from autogen_core.models import ChatCompletionClient
|
||||
from fastapi import FastAPI, HTTPException, WebSocket, WebSocketDisconnect
|
||||
from fastapi.middleware.cors import CORSMiddleware
|
||||
from fastapi.responses import FileResponse
|
||||
from fastapi.staticfiles import StaticFiles
|
||||
|
||||
logger = logging.getLogger(__name__)
|
||||
|
||||
app = FastAPI()
|
||||
|
||||
# Add CORS middleware
|
||||
app.add_middleware(
|
||||
CORSMiddleware,
|
||||
allow_origins=["*"], # Allows all origins
|
||||
allow_credentials=True,
|
||||
allow_methods=["*"], # Allows all methods
|
||||
allow_headers=["*"], # Allows all headers
|
||||
)
|
||||
|
||||
model_config_path = "model_config.yaml"
|
||||
state_path = "team_state.json"
|
||||
history_path = "team_history.json"
|
||||
|
||||
# Serve static files
|
||||
app.mount("/static", StaticFiles(directory="."), name="static")
|
||||
|
||||
@app.get("/")
|
||||
async def root():
|
||||
"""Serve the chat interface HTML file."""
|
||||
return FileResponse("app_team.html")
|
||||
|
||||
|
||||
async def get_team(
|
||||
user_input_func: Callable[[str, Optional[CancellationToken]], Awaitable[str]],
|
||||
) -> RoundRobinGroupChat:
|
||||
# Get model client from config.
|
||||
async with aiofiles.open(model_config_path, "r") as file:
|
||||
model_config = yaml.safe_load(await file.read())
|
||||
model_client = ChatCompletionClient.load_component(model_config)
|
||||
# Create the team.
|
||||
agent = AssistantAgent(
|
||||
name="assistant",
|
||||
model_client=model_client,
|
||||
system_message="You are a helpful assistant.",
|
||||
)
|
||||
yoda = AssistantAgent(
|
||||
name="yoda",
|
||||
model_client=model_client,
|
||||
system_message="Repeat the same message in the tone of Yoda.",
|
||||
)
|
||||
user_proxy = UserProxyAgent(
|
||||
name="user",
|
||||
input_func=user_input_func, # Use the user input function.
|
||||
)
|
||||
team = RoundRobinGroupChat(
|
||||
[agent, yoda, user_proxy],
|
||||
)
|
||||
# Load state from file.
|
||||
if not os.path.exists(state_path):
|
||||
return team
|
||||
async with aiofiles.open(state_path, "r") as file:
|
||||
state = json.loads(await file.read())
|
||||
await team.load_state(state)
|
||||
return team
|
||||
|
||||
|
||||
async def get_history() -> list[dict[str, Any]]:
|
||||
"""Get chat history from file."""
|
||||
if not os.path.exists(history_path):
|
||||
return []
|
||||
async with aiofiles.open(history_path, "r") as file:
|
||||
return json.loads(await file.read())
|
||||
|
||||
|
||||
@app.get("/history")
|
||||
async def history() -> list[dict[str, Any]]:
|
||||
try:
|
||||
return await get_history()
|
||||
except Exception as e:
|
||||
raise HTTPException(status_code=500, detail=str(e)) from e
|
||||
|
||||
|
||||
@app.websocket("/ws/chat")
|
||||
async def chat(websocket: WebSocket):
|
||||
await websocket.accept()
|
||||
|
||||
# User input function used by the team.
|
||||
async def _user_input(prompt: str, cancellation_token: CancellationToken | None) -> str:
|
||||
data = await websocket.receive_json()
|
||||
message = TextMessage.model_validate(data)
|
||||
return message.content
|
||||
|
||||
try:
|
||||
while True:
|
||||
# Get user message.
|
||||
data = await websocket.receive_json()
|
||||
request = TextMessage.model_validate(data)
|
||||
|
||||
try:
|
||||
# Get the team and respond to the message.
|
||||
team = await get_team(_user_input)
|
||||
history = await get_history()
|
||||
stream = team.run_stream(task=request)
|
||||
async for message in stream:
|
||||
if isinstance(message, TaskResult):
|
||||
continue
|
||||
await websocket.send_json(message.model_dump())
|
||||
if not isinstance(message, UserInputRequestedEvent):
|
||||
# Don't save user input events to history.
|
||||
history.append(message.model_dump())
|
||||
|
||||
# Save team state to file.
|
||||
async with aiofiles.open(state_path, "w") as file:
|
||||
state = await team.save_state()
|
||||
await file.write(json.dumps(state))
|
||||
|
||||
# Save chat history to file.
|
||||
async with aiofiles.open(history_path, "w") as file:
|
||||
await file.write(json.dumps(history))
|
||||
|
||||
except Exception as e:
|
||||
# Send error message to client
|
||||
error_message = {
|
||||
"type": "error",
|
||||
"content": f"Error: {str(e)}",
|
||||
"source": "system"
|
||||
}
|
||||
await websocket.send_json(error_message)
|
||||
# Re-enable input after error
|
||||
await websocket.send_json({
|
||||
"type": "UserInputRequestedEvent",
|
||||
"content": "An error occurred. Please try again.",
|
||||
"source": "system"
|
||||
})
|
||||
|
||||
except WebSocketDisconnect:
|
||||
logger.info("Client disconnected")
|
||||
except Exception as e:
|
||||
logger.error(f"Unexpected error: {str(e)}")
|
||||
try:
|
||||
await websocket.send_json({
|
||||
"type": "error",
|
||||
"content": f"Unexpected error: {str(e)}",
|
||||
"source": "system"
|
||||
})
|
||||
except:
|
||||
pass
|
||||
|
||||
|
||||
# Example usage
|
||||
if __name__ == "__main__":
|
||||
import uvicorn
|
||||
|
||||
uvicorn.run(app, host="0.0.0.0", port=8002)
|
||||
26
python/samples/agentchat_fastapi/model_config_template.yaml
Normal file
26
python/samples/agentchat_fastapi/model_config_template.yaml
Normal file
@ -0,0 +1,26 @@
|
||||
# Use Open AI with key
|
||||
provider: autogen_ext.models.openai.OpenAIChatCompletionClient
|
||||
config:
|
||||
model: gpt-4o
|
||||
api_key: REPLACE_WITH_YOUR_API_KEY
|
||||
# Use Azure Open AI with key
|
||||
# provider: autogen_ext.models.openai.AzureOpenAIChatCompletionClient
|
||||
# config:
|
||||
# model: gpt-4o
|
||||
# azure_endpoint: https://{your-custom-endpoint}.openai.azure.com/
|
||||
# azure_deployment: {your-azure-deployment}
|
||||
# api_version: {your-api-version}
|
||||
# api_key: REPLACE_WITH_YOUR_API_KEY
|
||||
# Use Azure OpenAI with AD token provider.
|
||||
# provider: autogen_ext.models.openai.AzureOpenAIChatCompletionClient
|
||||
# config:
|
||||
# model: gpt-4o
|
||||
# azure_endpoint: https://{your-custom-endpoint}.openai.azure.com/
|
||||
# azure_deployment: {your-azure-deployment}
|
||||
# api_version: {your-api-version}
|
||||
# azure_ad_token_provider:
|
||||
# provider: autogen_ext.auth.azure.AzureTokenProvider
|
||||
# config:
|
||||
# provider_kind: DefaultAzureCredential
|
||||
# scopes:
|
||||
# - https://cognitiveservices.azure.com/.default
|
||||
Loading…
x
Reference in New Issue
Block a user