OpenAI API助手无法调用关联向量存储的问题求助

你当前调用的是chat/completions接口，这是直接调用GPT-4o模型的接口，完全不会关联你在OpenAI控制台创建的、绑定了向量存储的助手。只有使用Assistants API的完整流程（线程-消息-运行），才能让助手调用已关联的向量存储资源。

<?php
$api_key = 'MY-API-KEY';
$assistant_id = 'MY-ASSISTANT-ID';

// 获取POST请求的用户消息
$data = json_decode(file_get_contents('php://input'), true);
$user_message = isset($data['message']) ? $data['message'] : '';

error_log("用户消息: " . $user_message);

// 第一步：创建线程
$thread_payload = json_encode([]);
$ch = curl_init('https://api.openai.com/v1/threads');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $thread_payload);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Authorization: Bearer ' . $api_key,
    'OpenAI-Beta: assistants=v2'
]);
$thread_response = curl_exec($ch);
if (curl_errno($ch)) {
    $error = '创建线程失败: ' . curl_error($ch);
    error_log($error);
    echo json_encode(['reply' => $error]);
    exit;
}
curl_close($ch);
$thread_data = json_decode($thread_response, true);
$thread_id = $thread_data['id'] ?? '';
if (!$thread_id) {
    $error = '无法获取线程ID';
    error_log($error);
    echo json_encode(['reply' => $error]);
    exit;
}
error_log("线程ID: " . $thread_id);

// 第二步：向线程添加用户消息
$message_payload = json_encode([
    'role' => 'user',
    'content' => $user_message
]);
$ch = curl_init("https://api.openai.com/v1/threads/{$thread_id}/messages");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $message_payload);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Authorization: Bearer ' . $api_key,
    'OpenAI-Beta: assistants=v2'
]);
$message_response = curl_exec($ch);
if (curl_errno($ch)) {
    $error = '添加消息失败: ' . curl_error($ch);
    error_log($error);
    echo json_encode(['reply' => $error]);
    exit;
}
curl_close($ch);
error_log("消息添加结果: " . $message_response);

// 第三步：运行线程，触发助手调用向量存储
$run_payload = json_encode([
    'assistant_id' => $assistant_id
]);
$ch = curl_init("https://api.openai.com/v1/threads/{$thread_id}/runs");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $run_payload);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Authorization: Bearer ' . $api_key,
    'OpenAI-Beta: assistants=v2'
]);
$run_response = curl_exec($ch);
if (curl_errno($ch)) {
    $error = '启动运行失败: ' . curl_error($ch);
    error_log($error);
    echo json_encode(['reply' => $error]);
    exit;
}
curl_close($ch);
$run_data = json_decode($run_response, true);
$run_id = $run_data['id'] ?? '';
if (!$run_id) {
    $error = '无法获取运行ID';
    error_log($error);
    echo json_encode(['reply' => $error]);
    exit;
}
error_log("运行ID: " . $run_id);

// 第四步：轮询运行状态，直到完成
do {
    $ch = curl_init("https://api.openai.com/v1/threads/{$thread_id}/runs/{$run_id}");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Authorization: Bearer ' . $api_key,
        'OpenAI-Beta: assistants=v2'
    ]);
    $run_status_response = curl_exec($ch);
    curl_close($ch);
    $run_status_data = json_decode($run_status_response, true);
    $status = $run_status_data['status'] ?? '';
    error_log("当前运行状态: " . $status);
    
    if ($status === 'completed') {
        break;
    } elseif (in_array($status, ['failed', 'cancelled', 'expired'])) {
        $error = '运行失败，状态: ' . $status;
        error_log($error);
        echo json_encode(['reply' => $error]);
        exit;
    }
    
    // 等待1秒后再次查询
    sleep(1);
} while (true);

// 第五步：获取线程中的所有消息，提取助手回复
$ch = curl_init("https://api.openai.com/v1/threads/{$thread_id}/messages?order=asc");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Authorization: Bearer ' . $api_key,
    'OpenAI-Beta: assistants=v2'
]);
$messages_response = curl_exec($ch);
curl_close($ch);
$messages_data = json_decode($messages_response, true);

$assistant_reply = '无助手回复';
foreach ($messages_data['data'] as $message) {
    if ($message['role'] === 'assistant') {
        // 提取文本内容（忽略附件等其他格式）
        foreach ($message['content'] as $content) {
            if ($content['type'] === 'text') {
                $assistant_reply = $content['text']['value'];
                break;
            }
        }
        break;
    }
}

error_log("助手回复: " . $assistant_reply);
echo json_encode(['reply' => $assistant_reply]);
?>

• 必须携带OpenAI-Beta: assistants=v2请求头，启用Assistants API v2版本
• 标准流程为：创建线程→添加用户消息→启动运行→轮询运行状态→获取助手回复，只有这套流程会触发助手调用已关联的向量存储
• 轮询状态是因为助手需要时间检索向量存储并生成回复，无法立即返回结果

内容的提问来源于stack exchange，提问作者objelland