Add lock on somewhere

models/contest.js

@@ -120,6 +120,8 @@ class Contest extends Model {
     let problems = await this.getProblems();
     if (!problems.includes(judge_state.problem_id)) throw new ErrorMessage('当前比赛中无此题目。');
 
+    await syzoj.utils.lock('Contest::newSubmission', 'create_player', judge_state.user_id);
+
     let player = await ContestPlayer.findInContest({
       contest_id: this.id,
       user_id: judge_state.user_id
@@ -132,6 +134,8 @@ class Contest extends Model {
       });
     }
 
+    syzoj.utils.unlock('Contest::newSubmission', 'create_player', judge_state.user_id);
+
     await player.updateScore(judge_state);
     await player.save();
 

models/contest_player.js

@@ -69,10 +69,11 @@ class ContestPlayer extends Model {
   }
 
   async updateScore(judge_state) {
+    await syzoj.utils.lock('ContestPlayer::updateScore', this.id);
+
     await this.loadRelationships();
     if (this.contest.type === 'ioi') {
-      if (judge_state.pending) return;
-
+      if (!judge_state.pending) {
         if (!this.score_details[judge_state.problem_id]) {
           this.score_details[judge_state.problem_id] = {
             score: judge_state.score,
@@ -105,6 +106,7 @@ class ContestPlayer extends Model {
         for (let x in this.score_details) {
           this.score += this.score_details[x].score;
         }
+      }
     } else if (this.contest.type === 'noi') {
       this.score_details[judge_state.problem_id] = {
         score: judge_state.score,
@@ -115,8 +117,7 @@ class ContestPlayer extends Model {
         this.score += this.score_details[x].score;
       }
     } else if (this.contest.type === 'acm') {
-      if (judge_state.pending) return;
-
+      if (!judge_state.pending) {
         if (!this.score_details[judge_state.problem_id]) {
           this.score_details[judge_state.problem_id] = {
             accepted: false,
@@ -160,6 +161,9 @@ class ContestPlayer extends Model {
       }
     }
 
+    syzoj.utils.unlock('ContestPlayer::updateScore', this.id);
+  }
+
   getModel() { return model; }
 }
 

models/judge_state.js

@@ -196,6 +196,8 @@ class JudgeState extends Model {
   }
 
   async rejudge() {
+    await syzoj.utils.lock('JudgeState::rejudge', this.id);
+
     await this.loadRelationships();
 
     let oldStatus = this.status;
@@ -229,6 +231,8 @@ class JudgeState extends Model {
       let contest = await Contest.fromID(this.type_info);
       await contest.newSubmission(this);
     }
+
+    syzoj.utils.unlock('JudgeState::rejudge', this.id);
   }
 
   getModel() { return model; }

models/user.js

@@ -88,6 +88,8 @@ class User extends Model {
   }
 
   async refreshSubmitInfo() {
+    await syzoj.utils.lock('User::refreshSubmitInfo', this.id);
+
     let JudgeState = syzoj.model('judge_state');
     let all = await JudgeState.model.findAll({
       attributes: ['problem_id'],
@@ -95,7 +97,7 @@ class User extends Model {
         user_id: this.id,
         status: 'Accepted',
         type: {
-          $ne: 1 // Not a contest submissio
+          $ne: 1 // Not a contest submission
         }
       }
     });
@@ -107,11 +109,13 @@ class User extends Model {
     let cnt = await JudgeState.count({
       user_id: this.id,
       type: {
-        $ne: 1 // Not a contest submissio
+        $ne: 1 // Not a contest submission
       }
     });
 
     this.submit_num = cnt;
+
+    syzoj.utils.unlock('User::refreshSubmitInfo', this.id);
   }
 
   async getACProblems() {

modules/api.js

@@ -95,14 +95,21 @@ app.get('/api/waiting_judge', async (req, res) => {
   try {
     if (req.query.session_id !== syzoj.config.judge_token) return res.status(404).send({ err: 'Permission denied' });
 
+    await syzoj.utils.lock('/api/waiting_judge');
+
     let waiting_judge = await WaitingJudge.findOne();
-    if (!waiting_judge) return res.send({ have_task: 0 });
+    if (!waiting_judge) {
+      syzoj.utils.unlock('/api/waiting_judge');
+      return res.send({ have_task: 0 });
+    }
 
     let judge_state = await waiting_judge.getJudgeState();
     await judge_state.loadRelationships();
     await judge_state.problem.loadRelationships();
     await waiting_judge.destroy();
 
+    syzoj.utils.unlock('/api/waiting_judge');
+
     res.send({
       have_task: 1,
       judge_id: judge_state.id,
@@ -143,4 +150,4 @@ app.get('/static/uploads/:md5', async (req, res) => {
   } catch (e) {
     res.status(500).send(e);
   }
-})
+});

package.json

@@ -25,6 +25,7 @@
   "dependencies": {
     "adm-zip": "^0.4.7",
     "ansi-to-html": "^0.4.2",
+    "async-lock": "^0.3.9",
     "body-parser": "^1.15.2",
     "cheerio": "^1.0.0-rc.1",
     "cookie-parser": "^1.4.3",

utility.js

@@ -46,6 +46,7 @@ let pygmentize = require('pygmentize-bundled-cached');
 let gravatar = require('gravatar');
 let AdmZip = require('adm-zip');
 let filesize = require('file-size');
+let AsyncLock = require('async-lock');
 
 function escapeHTML(s) {
   // Code from http://stackoverflow.com/questions/5251520/how-do-i-escape-some-html-in-javascript/5251551
@@ -73,6 +74,30 @@ function highlightPygmentize(code, lang, cb) {
 
 renderer.config.highlight = highlightPygmentize;
 
+let locks = {};
+let lock = function () {
+  let s = JSON.stringify(Array.from(arguments));
+  return new Promise((resolve, reject) => {
+    if (!locks[s]) {
+      locks[s] = {
+        lock: new AsyncLock(),
+        done: null
+      };
+    }
+
+    locks[s].lock.acquire('', done => {
+      locks[s].done = done;
+      resolve();
+    });
+  });
+};
+
+let unlock = function () {
+  let s = JSON.stringify(Array.from(arguments));
+  locks[s].done();
+  locks[s].done = null;
+}
+
 module.exports = {
   resolvePath(s) {
     let a = Array.from(arguments);
@@ -320,5 +345,7 @@ module.exports = {
   },
   isValidUsername(s) {
     return /^[a-zA-Z0-9\-\_]+$/.test(s);
-  }
+  },
+  lock: lock,
+  unlock: unlock
 };