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added new job for updating users' data periodically and updated the prediction flow. No longer storing user contest history as it's time consuming.
1 parent 581ecbb commit 67375c0

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16 files changed

+495
-420
lines changed

16 files changed

+495
-420
lines changed

‎background.js‎

Lines changed: 19 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -14,8 +14,25 @@ const { addQueue, removeQueue, setQueues, replaceQueues } = createBullBoard({
1414
serverAdapter.setBasePath("/bull-board");
1515

1616
const initScheduler = async () => {
17-
await jobScheduler.add({});
18-
await jobScheduler.add({}, { repeat: { cron: "0 0 * * *" } });
17+
await jobScheduler.add("contestScheduler", {});
18+
await jobScheduler.add("updateUserDataScheduler", {
19+
rateLimit: 3,
20+
limit: 1000,
21+
});
22+
23+
// repeat contestScheduler every day at midnight
24+
await jobScheduler.add(
25+
"contestScheduler",
26+
{},
27+
{ repeat: { cron: "0 0 * * *" } }
28+
);
29+
30+
// Repeat updateUserDataScheduler every 4 hours
31+
await jobScheduler.add(
32+
"updateUserDataScheduler",
33+
{ rateLimit: 3, limit: 1000 },
34+
{ repeat: { cron: "0 */4 * * *" } }
35+
);
1936
};
2037
initScheduler();
2138

‎helpers.js‎

Lines changed: 32 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,32 @@
1+
exports.getUserId = (username, dataRegion = "US") => {
2+
return dataRegion + "/" + username.trim().toLowerCase();
3+
};
4+
5+
exports.convertDateYYYYMMDD = (date) => {
6+
var yyyy = date.getFullYear().toString();
7+
var mm = (date.getMonth() + 1).toString();
8+
var dd = date.getDate().toString();
9+
10+
var mmChars = mm.split("");
11+
var ddChars = dd.split("");
12+
13+
return (
14+
yyyy +
15+
"-" +
16+
(mmChars[1] ? mm : "0" + mmChars[0]) +
17+
"-" +
18+
(ddChars[1] ? dd : "0" + ddChars[0])
19+
);
20+
};
21+
22+
exports.IsLatestContest = (time) => {
23+
return Date.now() - time <= 2 * 24 * 60 * 60 * 1000;
24+
};
25+
26+
exports.getRemainingTime = (time) => {
27+
return Math.max(0, Math.ceil(time - Date.now()));
28+
};
29+
30+
exports.isNumeric = (value) => {
31+
return /^\d+$/.test(value);
32+
};

‎models/contest.js‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -22,6 +22,7 @@ const rankingSchema = new Schema({
2222
});
2323
const ContestRankingsSchema = new Schema({
2424
_id: String,
25+
title: String,
2526
startTime: Date,
2627
endTime: Date,
2728
contest_id: Number,
@@ -30,6 +31,10 @@ const ContestRankingsSchema = new Schema({
3031
type: Boolean,
3132
default: false,
3233
},
34+
users_fetched: {
35+
type: Boolean,
36+
default: false,
37+
},
3338
ratings_predicted: {
3439
type: Boolean,
3540
default: false,

models/users.js renamed to models/user.js

File renamed without changes.

‎services/contests.js‎

Lines changed: 25 additions & 63 deletions
Original file line numberDiff line numberDiff line change
@@ -1,41 +1,15 @@
11
const fetch = require("node-fetch");
22
const Contest = require("../models/contest");
3+
const { IsLatestContest } = require("../helpers");
34

4-
// async function pushRankingsToContest(
5-
// contest_id,
6-
// rankings,
7-
// pagesCnt,
8-
// islastPage
9-
// ) {
10-
// try {
11-
// await Contest.findOneAndUpdate(
12-
// {
13-
// _id: contest_id,
14-
// },
15-
// {
16-
// $push: {
17-
// rankings: rankings,
18-
// },
19-
// $inc: {
20-
// pages_fetched: pagesCnt,
21-
// },
22-
// $set: {
23-
// rankings_fetched: islastPage,
24-
// },
25-
// }
26-
// );
27-
28-
// return null;
29-
// } catch (err) {
30-
// console.log(err);
31-
// return err;
32-
// }
33-
// }
345
const fetchContestRankings = async function (contestSlug) {
356
try {
36-
let contest = await Contest.findById(contestSlug, { rankings: 0 });
7+
let contest = await Contest.findById(contestSlug);
378
if (!contest) {
38-
return Error(`Contest ${contestSlug} not found in the db`);
9+
return [null, Error(`Contest ${contestSlug} not found in the db`)];
10+
}
11+
if (contest.rankings_fetched) {
12+
return [contest, null];
3913
}
4014

4115
console.log(`fetching ${contestSlug} ...`);
@@ -46,16 +20,23 @@ const fetchContestRankings = async function (contestSlug) {
4620
let pages = Math.floor(resp.user_num / 25);
4721
let all_rankings = [];
4822
let failed = [];
23+
let lastPage = Math.MAX_SAFE_INTEGER;
4924
const fetchPageRankings = async (
5025
pageNo,
5126
retries,
5227
throwError = false
5328
) => {
29+
if (pageNo > lastPage) {
30+
return;
31+
}
5432
console.log(`Fetching rankings (${contestSlug}): page: ${pageNo}`);
5533
try {
5634
let res = await fetch(
5735
`https://leetcode.com/contest/api/ranking/${contestSlug}/?pagination=${pageNo}&region=global`
5836
);
37+
if (res.status !== 200) {
38+
throw new Error(res.statusText);
39+
}
5940
res = await res.json();
6041
rankings = res.total_rank
6142
.filter(
@@ -86,15 +67,18 @@ const fetchContestRankings = async function (contestSlug) {
8667
ranking["_id"] = username;
8768
return ranking;
8869
});
70+
if (rankings.length < 25) {
71+
lastPage = Math.min(lastPage, pageNo);
72+
}
8973
all_rankings = all_rankings.concat(rankings);
9074
console.log(
91-
`Fetched rankings (${contestSlug}): page: ${pageNo}`
75+
`Fetched rankings (${contestSlug} page: ${pageNo})`
9276
);
9377
} catch (err) {
9478
console.log(
95-
`Failed to fetch rankings (${contestSlug}, page: ${pageNo})`
79+
`Failed to fetch rankings (${contestSlug} page: ${pageNo})`,
80+
err.message
9681
);
97-
console.log(err);
9882
if (retries > 0) {
9983
await fetchPageRankings(pageNo, retries - 1);
10084
} else if (throwError) {
@@ -121,11 +105,12 @@ const fetchContestRankings = async function (contestSlug) {
121105
all_rankings.sort((a, b) => (a.rank > b.rank ? 1 : -1));
122106
contest.rankings = all_rankings;
123107
contest.rankings_fetched = true;
124-
contest.user_num = resp.user_num;
125-
await contest.save();
108+
contest.user_num = all_rankings.length;
109+
await contest.update();
126110
console.log(`Updated Rankings in ${contestSlug}.`);
111+
return [contest, null];
127112
} catch (err) {
128-
return err;
113+
return [null, err];
129114
}
130115
};
131116
const fetchContestsMetaData = async () => {
@@ -163,14 +148,10 @@ const fetchContestsMetaData = async () => {
163148
});
164149
res = await res.json();
165150

166-
const withinAWeek = (endTime) => {
167-
return Date.now() - endTime <= 7 * 24 * 60 * 60 * 1000;
168-
};
169-
170151
for (let i = 0; i < res.data.allContests.length; i++) {
171152
let contest = res.data.allContests[i];
172153
const endTime = contest.startTime * 1000 + contest.duration * 1000;
173-
if (!withinAWeek(endTime)) {
154+
if (!IsLatestContest(endTime)) {
174155
continue;
175156
}
176157
let contestExists = await Contest.exists({
@@ -179,13 +160,12 @@ const fetchContestsMetaData = async () => {
179160
if (contestExists) {
180161
continue;
181162
}
182-
console.log(contest.titleSlug);
183163
let newContest = new Contest({
184164
_id: contest.titleSlug,
165+
title: contest.title,
185166
startTime: contest.startTime * 1000,
186167
endTime: endTime,
187168
lastUpdated: Date.now(),
188-
num_user: contest.num_user,
189169
});
190170
await newContest.save();
191171
console.log(`created new contest: ${contest.titleSlug}`);
@@ -197,25 +177,7 @@ const fetchContestsMetaData = async () => {
197177
return null;
198178
}
199179
};
200-
const updateContestRankings = async function (contestSlug) {
201-
try {
202-
let contest = await Contest.findById(contestSlug, {
203-
rankings: 0,
204-
});
205-
206-
if (!contest) {
207-
return Error(`contest ${contestSlug} not found in the db.`);
208-
} else if (!contest.rankings_fetched) {
209-
let err = await fetchContestRankings(contestSlug);
210-
return err;
211-
}
212-
return null;
213-
} catch (err) {
214-
return err;
215-
}
216-
};
217180

218181
// exports
219182
exports.fetchContestsMetaData = fetchContestsMetaData;
220-
exports.updateContestRankings = updateContestRankings;
221183
exports.fetchContestRankings = fetchContestRankings;

‎services/helpers.js‎

Lines changed: 0 additions & 3 deletions
This file was deleted.

‎services/job-queues/contestPredictionQueue.js‎

Lines changed: 44 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,11 +1,12 @@
11
const Queue = require("bull");
22
const { predict } = require("../predict");
33
const opts = require("../redis");
4+
const { updateUsers } = require("../users");
45

56
opts.lockDuration = 30 * 60 * 1000; // 30 minutes
67

78
const predictQueue = new Queue("Predictions", opts);
8-
predictQueue.process(async (job, done) => {
9+
predictQueue.process("predictRatings", async (job, done) => {
910
console.log("Processing job: ", job.id);
1011
const err = await predict(job);
1112
if (err) {
@@ -15,8 +16,49 @@ predictQueue.process(async (job, done) => {
1516
done();
1617
});
1718

19+
predictQueue.process("updateUserData", async (job, done) => {
20+
try {
21+
const predictRatingJobScheduled = await checkPredictRatingJobs();
22+
if (predictRatingJobScheduled) {
23+
done(
24+
new Error(
25+
"PredictRating job is scheduled. Cannot process this job right now."
26+
)
27+
);
28+
return;
29+
}
30+
console.log("Processing job: ", job.id);
31+
const err = await updateUsers(job);
32+
if (err) {
33+
console.error(err);
34+
done(err);
35+
} else {
36+
done();
37+
}
38+
} catch (err) {
39+
done(err);
40+
}
41+
});
42+
43+
// funtion to check if any predictRating job is scheduled
44+
const checkPredictRatingJobs = async () => {
45+
let jobs = await predictQueue.getJobs([
46+
"active",
47+
"waiting",
48+
"delayed",
49+
"failed",
50+
]);
51+
jobs = jobs.filter((job) => job.name === "predictRatings");
52+
let date = new Date();
53+
date.setDate(date.getDate() + 30);
54+
for (job of jobs) {
55+
date = Math.min(date, new Date(job.opts.timestamp + job.opts.delay));
56+
}
57+
return date - Date.now() <= 1 * 24 * 60 * 60 * 100;
58+
};
59+
1860
predictQueue.on("completed", (job, result) => {
19-
console.log(`Prediction Job: ${job.id} completed.`);
61+
console.log(`${job.name} Job: ${job.id} completed.`);
2062
});
2163

2264
module.exports = predictQueue;

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