317 lines
12 KiB
PHP
317 lines
12 KiB
PHP
<?php
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/**
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* LLM AI Review - AI错误点评（SSE 流式输出版）
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* 接收 solution_id，收集上下文信息，调用LLM API流式返回启发式点评
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* 结果缓存到 llm_review 表，同一 solution_id 再次请求直接返回缓存
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*/
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require_once('./include/db_info.inc.php');
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require_once('./include/setlang.php');
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require_once('./include/const.inc.php');
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// ---- 辅助函数：SSE 事件输出 ----
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function sse_send($event, $data) {
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echo "event: $event\ndata: " . json_encode($data, JSON_UNESCAPED_UNICODE) . "\n\n";
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@ob_flush();
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@flush();
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}
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function sse_error($msg) {
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sse_send("error", ["message" => $msg]);
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}
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// ---- 基础校验 ----
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if (!isset($OJ_LLM_ENABLED) || !$OJ_LLM_ENABLED) {
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// 返回 JSON（非 SSE），因为前端可能用 $.ajax 调用
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header("Content-Type: application/json; charset=utf-8");
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echo json_encode(["error" => "AI点评功能未开启"], JSON_UNESCAPED_UNICODE);
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exit;
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}
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// 检查登录
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session_start();
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if (!isset($_SESSION[$OJ_NAME . '_user_id'])) {
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header("Content-Type: application/json; charset=utf-8");
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echo json_encode(["error" => "请先登录"], JSON_UNESCAPED_UNICODE);
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exit;
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}
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// 获取 solution_id
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if (!isset($_GET['sid'])) {
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header("Content-Type: application/json; charset=utf-8");
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echo json_encode(["error" => "缺少参数 sid"], JSON_UNESCAPED_UNICODE);
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exit;
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}
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$sid = intval($_GET['sid']);
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if ($sid <= 0) {
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header("Content-Type: application/json; charset=utf-8");
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echo json_encode(["error" => "无效的 solution_id"], JSON_UNESCAPED_UNICODE);
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exit;
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}
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// ---- 1. 检查缓存 ----
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// 自动建表（首次调用时）
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pdo_query("CREATE TABLE IF NOT EXISTS `llm_review` (
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`solution_id` INT NOT NULL,
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`review` TEXT NOT NULL,
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`create_time` DATETIME NOT NULL,
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PRIMARY KEY (`solution_id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
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$cache = pdo_query("SELECT `review` FROM `llm_review` WHERE `solution_id`=?", $sid);
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if ($cache !== -1 && !empty($cache)) {
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// 有缓存，走 SSE 立刻返回（前端统一用 SSE 接收）
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header("Content-Type: text/event-stream; charset=utf-8");
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header("Cache-Control: no-cache");
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header("X-Accel-Buffering: no");
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sse_send("cached", ["text" => $cache[0]['review']]);
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sse_send("done", []);
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exit;
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}
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// ---- 设置 SSE 响应头 ----
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header("Content-Type: text/event-stream; charset=utf-8");
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header("Cache-Control: no-cache");
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header("X-Accel-Buffering: no");
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if (function_exists('apache_setenv')) {
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@apache_setenv('no-gzip', '1');
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}
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@ini_set('zlib.output_compression', 0);
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@ini_set('implicit_flush', 1);
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while (ob_get_level()) ob_end_flush();
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// ---- 2. 查询 solution 信息 ----
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$solution = pdo_query("SELECT * FROM `solution` WHERE `solution_id`=?", $sid);
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if (empty($solution)) {
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sse_error("找不到该提交记录");
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exit;
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}
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$sol = $solution[0];
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$problem_id = intval($sol['problem_id']);
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$language = intval($sol['language']);
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$result_code = intval($sol['result']);
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$pass_rate = floatval($sol['pass_rate']) * 100;
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$lang_name = isset($language_name[$language]) ? $language_name[$language] : "unknown";
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// ---- 3. 查询学生源码 ----
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$src = pdo_query("SELECT `source` FROM `source_code_user` WHERE `solution_id`=?", $sid);
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$student_code = (!empty($src) && $src !== -1) ? $src[0]['source'] : "";
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// ---- 4. 查询题目信息 ----
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$prob = pdo_query("SELECT `title`,`description`,`input`,`output`,`sample_input`,`sample_output`,`hint` FROM `problem` WHERE `problem_id`=?", $problem_id);
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if (empty($prob) || $prob === -1) {
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sse_error("找不到该题目");
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exit;
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}
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$p = $prob[0];
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// ---- 5. 查询第一个 AC 代码（同语言） ----
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$first_ac = pdo_query(
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"SELECT `solution_id` FROM `solution` WHERE `problem_id`=? AND `result`=4 AND `language`=? ORDER BY `in_date` ASC LIMIT 1",
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$problem_id, $language
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);
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$reference_code = "";
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if (!empty($first_ac) && $first_ac !== -1) {
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$ref_src = pdo_query("SELECT `source` FROM `source_code_user` WHERE `solution_id`=?", intval($first_ac[0]['solution_id']));
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if (!empty($ref_src) && $ref_src !== -1) {
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$reference_code = $ref_src[0]['source'];
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}
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}
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// ---- 6. 查询 diff/error 信息 ----
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$diff_info = "";
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if ($result_code == 11) {
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$err = pdo_query("SELECT `error` FROM `compileinfo` WHERE `solution_id`=?", $sid);
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if (!empty($err) && $err !== -1) {
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$diff_info = $err[0]['error'];
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}
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} else {
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$err = pdo_query("SELECT `error` FROM `runtimeinfo` WHERE `solution_id`=?", $sid);
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if (!empty($err) && $err !== -1) {
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$diff_info = $err[0]['error'];
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}
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}
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// ---- 7. 组装 Prompt ----
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$system_prompt = isset($OJ_LLM_SYSTEM_PROMPT) && $OJ_LLM_SYSTEM_PROMPT !== ""
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? $OJ_LLM_SYSTEM_PROMPT
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: <<<EOP
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你是一位经验丰富的编程辅导老师，正在帮助一名正在学习C++的初中学生。
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你的职责：
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1. 用亲切、鼓励的语气和学生交流
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2. 仔细分析学生的代码，找出错误所在并解释错误原因
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3. 给出思考方向和启发性提示，引导学生自己去发现和改正错误
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4. 绝对不要直接给出正确代码、完整解法或关键算法步骤
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5. 不要在回复中透露、引用、复述或暗示参考代码的任何内容
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6. 如果学生代码思路正确但有小bug，肯定其思路并指出具体的bug位置
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7. 如果是格式错误(PE)，提醒学生注意输出格式要求
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8. 如果是超时(TLE)，引导学生思考算法的时间复杂度
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9. 如果是运行时错误(RE)，帮助学生分析可能的数组越界、除零等问题
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10. 如果是答案错误(WA)，可以建议学生用样例手动模拟执行过程
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11. 使用中文回答，适当使用Markdown格式使内容清晰易读
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EOP;
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$user_prompt = "## 题目信息\n";
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$user_prompt .= "- 标题: " . $p['title'] . "\n";
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$user_prompt .= "- 题目描述:\n" . $p['description'] . "\n";
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if (!empty($p['input'])) $user_prompt .= "- 输入格式:\n" . $p['input'] . "\n";
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if (!empty($p['output'])) $user_prompt .= "- 输出格式:\n" . $p['output'] . "\n";
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if (!empty($p['sample_input'])) $user_prompt .= "- 样例输入:\n```\n" . $p['sample_input'] . "\n```\n";
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if (!empty($p['sample_output'])) $user_prompt .= "- 样例输出:\n```\n" . $p['sample_output'] . "\n```\n";
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if (!empty($p['hint'])) $user_prompt .= "- 提示:\n" . $p['hint'] . "\n";
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$user_prompt .= "\n## 判题结果\n";
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$user_prompt .= $judge_result[$result_code] . "（通过率: " . round($pass_rate, 1) . "%）\n";
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if (!empty($diff_info)) {
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$user_prompt .= "\n## 错误/对比信息\n```\n" . $diff_info . "\n```\n";
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}
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$user_prompt .= "\n## 学生提交的代码\n```" . strtolower($lang_name) . "\n" . $student_code . "\n```\n";
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if (!empty($reference_code)) {
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$user_prompt .= "\n## 参考代码（仅供你分析对比，绝不可在回复中透露或暗示其内容）\n```" . strtolower($lang_name) . "\n" . $reference_code . "\n```\n";
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}
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$user_prompt .= "\n请分析学生的错误，给出启发性的提示和引导，帮助学生自己发现问题并改正。\n";
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// ---- 8. 流式调用 LLM API ----
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$api_url = isset($OJ_LLM_API_URL) ? $OJ_LLM_API_URL : "https://api.minimaxi.com/anthropic/v1/messages";
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$api_key = isset($OJ_LLM_API_KEY) ? $OJ_LLM_API_KEY : "";
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$model = isset($OJ_LLM_MODEL) ? $OJ_LLM_MODEL : "MiniMax-M2.5";
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$max_tokens = isset($OJ_LLM_MAX_TOKENS) ? intval($OJ_LLM_MAX_TOKENS) : 1024;
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$timeout = isset($OJ_LLM_TIMEOUT) ? intval($OJ_LLM_TIMEOUT) : 60;
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if (empty($api_key)) {
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sse_error("API Key未配置");
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exit;
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}
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$request_body = json_encode([
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"model" => $model,
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"max_tokens" => $max_tokens,
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"system" => $system_prompt,
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"temperature" => 1.0,
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"stream" => true,
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"messages" => [
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["role" => "user", "content" => $user_prompt]
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]
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]);
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// ---- 流式 SSE 转发 ----
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// 追踪连接状态和累积文本
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$GLOBALS['_llm_alive'] = true;
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$GLOBALS['_llm_full_text'] = "";
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$GLOBALS['_llm_buffer'] = "";
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$GLOBALS['_llm_sent_text'] = ""; // 已发送给前端的文本（用于增量比较）
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// 检测客户端断开
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register_shutdown_function(function() {
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$GLOBALS['_llm_alive'] = false;
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});
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$ch = curl_init($api_url);
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curl_setopt_array($ch, [
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CURLOPT_POST => true,
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CURLOPT_POSTFIELDS => $request_body,
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CURLOPT_HTTPHEADER => [
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"Content-Type: application/json",
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"x-api-key: " . $api_key,
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"anthropic-version: 2023-06-01"
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],
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CURLOPT_RETURNTRANSFER => false,
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CURLOPT_TIMEOUT => $timeout,
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CURLOPT_CONNECTTIMEOUT => 10,
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CURLOPT_SSL_VERIFYPEER => true,
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CURLOPT_WRITEFUNCTION => function($ch, $chunk) use (&$_llm_alive, &$_llm_full_text, &$_llm_buffer) {
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if (!$_llm_alive) return 0;
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$_llm_buffer .= $chunk;
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// 按行解析 SSE
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while (($pos = strpos($_llm_buffer, "\n")) !== false) {
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$line = substr($_llm_buffer, 0, $pos);
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$_llm_buffer = substr($_llm_buffer, $pos + 1);
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$line = trim($line);
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if (empty($line)) continue;
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// 解析 data: 行
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if (strncmp($line, "data: ", 6) === 0) {
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$json_str = substr($line, 6);
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if ($json_str === "[DONE]") continue;
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$data = json_decode($json_str, true);
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if (!$data) continue;
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$type = isset($data['type']) ? $data['type'] : '';
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// content_block_delta: 增量文本
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if ($type === 'content_block_delta' && isset($data['delta']['text'])) {
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$_llm_full_text .= $data['delta']['text'];
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sse_send("chunk", ["text" => $data['delta']['text']]);
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// message_delta: 消息完成
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} elseif ($type === 'message_delta' && isset($data['delta']['stop_reason'])) {
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if ($data['delta']['stop_reason'] === 'end_turn' ||
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$data['delta']['stop_reason'] === 'max_tokens') {
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sse_send("done", []);
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return 0; // 停止 curl
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}
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// message_start / ping: 忽略
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} elseif ($type === 'message_start' || $type === 'ping') {
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continue;
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// content_block_start / stop: 忽略
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} elseif ($type === 'content_block_start' || $type === 'content_block_stop') {
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continue;
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// 错误事件
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} elseif ($type === 'error') {
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$msg = isset($data['error']['message']) ? $data['error']['message'] : '未知错误';
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sse_send("error", ["message" => "API错误: " . $msg]);
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return 0;
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}
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}
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}
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return strlen($chunk);
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}
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]);
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$result = curl_exec($ch);
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$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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$curl_error = curl_error($ch);
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curl_close($ch);
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// 如果连接断开，不缓存也不报错
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if (!$_llm_alive) exit;
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// ---- 处理错误 ----
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if ($result === false && empty($_llm_full_text)) {
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sse_error("网络请求失败: " . ($curl_error ?: "未知错误"));
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exit;
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}
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// 检查 HTTP 错误（如果 write callback 没有收到数据）
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if (empty($_llm_full_text) && $http_code !== 200) {
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sse_error("API请求失败 (HTTP $http_code)");
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exit;
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}
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if (empty($_llm_full_text)) {
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sse_error("API返回为空");
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exit;
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}
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// ---- 9. 缓存完整结果 ----
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$review_text = $_llm_full_text;
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$insert_ok = pdo_query("INSERT INTO `llm_review` (`solution_id`, `review`, `create_time`) VALUES (?, ?, NOW())", $sid, $review_text);
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if ($insert_ok === -1) {
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// 插入失败（可能已有记录），尝试更新
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pdo_query("UPDATE `llm_review` SET `review`=?, `create_time`=NOW() WHERE `solution_id`=?", $review_text, $sid);
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}
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