137 lines
4.9 KiB
PHP
137 lines
4.9 KiB
PHP
<?php
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declare(strict_types=1);
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namespace app\common\service;
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/**
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* Dify Chat App blocking 客户端。
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*
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* 只接受服务端配置中的模型 profile，避免把上游地址和密钥暴露给前端。
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*/
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class DifyChatService
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{
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/**
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* @param array<string,mixed> $inputs
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* @return array{ok:bool,content?:string,message_id?:string,latency_ms?:int,error_code?:string,error?:string}
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*/
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public static function chat(string $profile, array $inputs, string $query, string $user): array
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{
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$config = config('prescription_ai') ?: [];
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if (empty($config['enable'])) {
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return self::error('CONFIG_DISABLED', '处方 AI 解释未启用');
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}
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$modelConfig = $config['models'][$profile] ?? null;
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if (!is_array($modelConfig)) {
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return self::error('INVALID_PROFILE', '不支持的 AI 模型');
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}
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$baseUrl = trim((string) ($config['base_url'] ?? ''));
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$apiKey = trim((string) ($modelConfig['api_key'] ?? ''));
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if ($baseUrl === '' || $apiKey === '') {
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return self::error('CONFIG_MISSING', '该模型尚未配置 Dify 地址或 App Key');
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}
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if (!function_exists('curl_init')) {
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return self::error('CURL_UNAVAILABLE', '服务器尚未启用 cURL 扩展');
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}
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$payload = [
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'inputs' => $inputs,
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'query' => $query,
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'response_mode' => 'blocking',
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'user' => $user,
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];
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$body = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_INVALID_UTF8_SUBSTITUTE);
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if ($body === false) {
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return self::error('REQUEST_BUILD_FAILED', '处方数据编码失败');
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}
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$timeout = max(10, min(120, (int) ($config['timeout'] ?? 90)));
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$ch = curl_init();
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if ($ch === false) {
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return self::error('CURL_INIT_FAILED', '无法初始化 AI 请求');
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}
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curl_setopt_array($ch, [
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CURLOPT_URL => self::buildEndpoint($baseUrl),
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CURLOPT_POST => true,
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CURLOPT_POSTFIELDS => $body,
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CURLOPT_RETURNTRANSFER => true,
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CURLOPT_CONNECTTIMEOUT => min(8, max(3, (int) ceil($timeout / 4))),
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CURLOPT_TIMEOUT => $timeout,
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CURLOPT_SSL_VERIFYPEER => true,
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CURLOPT_SSL_VERIFYHOST => 2,
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CURLOPT_HTTPHEADER => [
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'Content-Type: application/json',
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'Accept: application/json',
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'Authorization: Bearer ' . $apiKey,
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],
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]);
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$startedAt = microtime(true);
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$responseBody = curl_exec($ch);
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$errno = curl_errno($ch);
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$httpCode = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
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curl_close($ch);
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$latencyMs = (int) round((microtime(true) - $startedAt) * 1000);
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if ($errno !== 0) {
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if ($errno === CURLE_OPERATION_TIMEDOUT) {
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return self::error('UPSTREAM_TIMEOUT', '模型响应超时，请稍后重试', $latencyMs);
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}
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return self::error('UPSTREAM_UNAVAILABLE', '暂时无法连接 AI 服务，请稍后重试', $latencyMs);
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}
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$decoded = json_decode((string) $responseBody, true);
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if ($httpCode === 401 || $httpCode === 403) {
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return self::error('CONFIG_INVALID', '模型 App Key 无效或无权限', $latencyMs);
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}
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if ($httpCode === 429 || $httpCode >= 500) {
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return self::error('UPSTREAM_BUSY', '模型服务繁忙，请稍后重试', $latencyMs);
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}
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if ($httpCode >= 400) {
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return self::error('UPSTREAM_REJECTED', '模型未能处理本次请求', $latencyMs);
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}
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if (!is_array($decoded)) {
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return self::error('INVALID_RESPONSE', '模型返回格式异常，请重试', $latencyMs);
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}
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$answer = trim((string) ($decoded['answer'] ?? ''));
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if ($answer === '') {
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return self::error('EMPTY_RESPONSE', '模型未返回报告内容，请重试', $latencyMs);
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}
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return [
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'ok' => true,
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'content' => $answer,
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'message_id' => (string) ($decoded['message_id'] ?? ''),
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'latency_ms' => $latencyMs,
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];
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}
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private static function buildEndpoint(string $baseUrl): string
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{
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$baseUrl = rtrim($baseUrl, '/');
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if (str_ends_with($baseUrl, '/chat-messages')) {
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return $baseUrl;
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}
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if (str_ends_with($baseUrl, '/v1')) {
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return $baseUrl . '/chat-messages';
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}
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return $baseUrl . '/v1/chat-messages';
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}
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/**
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* @return array{ok:false,error_code:string,error:string,latency_ms:int}
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*/
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private static function error(string $code, string $message, int $latencyMs = 0): array
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{
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return [
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'ok' => false,
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'error_code' => $code,
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'error' => $message,
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'latency_ms' => $latencyMs,
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];
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}
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}
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