Skip to content

Performance: Optimize historical performance fetching & implement backend caching to avoid rate-limiting #187

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
yashvi-3106 wants to merge 1 commit into
base: main
Choose a base branch
from
+153 −56
Open

Performance: Optimize historical performance fetching & implement backend caching to avoid rate-limiting #187

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
77 changes: 77 additions & 0 deletions scripts/bootstrap-user-history.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,77 @@
const fs = require("fs");
const path = require("path");

const DATA_DIR = process.env.DATA_DIR || path.join(__dirname, "..", "data");
const dailyDir = path.join(DATA_DIR, "daily");
const historyDir = path.join(DATA_DIR, "historical-user-data");

if (!fs.existsSync(dailyDir)) {
console.error(`Daily directory not found at: ${dailyDir}`);
process.exit(1);
}

if (!fs.existsSync(historyDir)) {
fs.mkdirSync(historyDir, { recursive: true });
}

console.log("Reading daily snapshots...");
const files = fs
.readdirSync(dailyDir)
.filter((f) => /^\d{4}-\d{2}-\d{2}-\d\.json$/.test(f));
console.log(`Found ${files.length} daily snapshots.`);

const userHistories = {};

for (const file of files) {
const filePath = path.join(dailyDir, file);
const dateStr = file.split("-").slice(0, 3).join("-");

try {
const data = JSON.parse(fs.readFileSync(filePath, "utf8"));
if (!Array.isArray(data)) continue;

for (const user of data) {
if (!user.id || !user.data) continue;

if (!userHistories[user.id]) {
userHistories[user.id] = [];
}

// Check if entry for this date already exists for the user
const exists = userHistories[user.id].some(
(entry) => entry.date === dateStr,
);
if (!exists) {
userHistories[user.id].push({
date: dateStr,
easy: user.data.easySolved || 0,
medium: user.data.mediumSolved || 0,
hard: user.data.hardSolved || 0,
});
}
}
} catch (err) {
console.error(`Error reading ${file}:`, err.message);
}
}

console.log("Writing user history files...");
let count = 0;
for (const username of Object.keys(userHistories)) {
// Sort by date chronologically
userHistories[username].sort((a, b) => new Date(a.date) - new Date(b.date));

const userFile = path.join(historyDir, `${username}.json`);
try {
fs.writeFileSync(
userFile,
JSON.stringify(userHistories[username], null, 2),
"utf8",
);
count++;
} catch (err) {
console.error(`Failed to write history file for ${username}:`, err.message);
}
}

console.log(`Migration complete. Generated history files for ${count} users.`);
85 changes: 29 additions & 56 deletions scripts/fetch-student-info.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,3 +1,6 @@
const fs = require("fs");
const path = require("path");

function getFileName(daysAgo) {
const now = new Date();
now.setDate(now.getDate() - daysAgo);
Expand All @@ -14,9 +17,6 @@ function getFileName(daysAgo) {
async function fetchStudentHistory(username) {
let history = [];
let ranking = null;
let missingFilesCount = 0;
const maxDays = 365;
const chunkSize = 100;

try {
const liveApiUrl = `https://leetcode-api-dun.vercel.app/${username}`;
Expand All @@ -33,65 +33,38 @@ async function fetchStudentHistory(username) {
);
}

let done = false;

for (let chunkStart = 0; chunkStart < maxDays; chunkStart += chunkSize) {
if (done) break;

const fetchPromises = [];
const chunkEnd = Math.min(chunkStart + chunkSize, maxDays);

for (let daysAgo = chunkStart; daysAgo < chunkEnd; daysAgo++) {
const fileName = getFileName(daysAgo);
const rawUrl = `https://raw.githubusercontent.com/codepvg/leetcode-ranking-data/main/daily/${fileName}`;

const p = fetch(rawUrl)
.then(async (res) => {
if (!res.ok) {
return { daysAgo, fileName, ok: false };
}
const data = await res.json();
return { daysAgo, fileName, ok: true, data };
})
.catch((err) => {
return { daysAgo, fileName, ok: false, error: err };
});

fetchPromises.push(p);
}

const results = await Promise.all(fetchPromises);

for (const result of results) {
if (!result.ok) {
missingFilesCount++;
if (missingFilesCount >= 7) {
done = true;
break;
}
continue;
}

missingFilesCount = 0;

const user = result.data.find((u) => u.id === username);

if (user) {
const dateStr = result.fileName.split("-").slice(0, 3).join("-");
try {
// If a local data folder is present, try reading from it first (development helper)
const localDir = process.env.DATA_DIR || path.join(__dirname, "..", "data");
const localFilePath = path.join(
localDir,
"historical-user-data",
`${username}.json`,
);

history.push({
date: dateStr,
easy: user.data.easySolved,
medium: user.data.mediumSolved,
hard: user.data.hardSolved,
});
if (fs.existsSync(localFilePath)) {
console.log(`[Dev] Loading historical data locally for: ${username}`);
history = JSON.parse(fs.readFileSync(localFilePath, "utf8"));
} else {
// Fallback to fetching from remote GitHub repository (production behavior)
const rawUrl = `https://raw.githubusercontent.com/codepvg/leetcode-ranking-data/main/historical-user-data/${username}.json`;
const response = await fetch(rawUrl);
if (response.ok) {
history = await response.json();
} else {
done = true;
break;
console.warn(
`No historical data found for user: ${username} (HTTP ${response.status})`,
);
}
}
} catch (err) {
console.error(
`Failed to fetch historical data for ${username}:`,
err.message,
);
}

// Ensure history is sorted chronologically
history.sort((a, b) => new Date(a.date) - new Date(b.date));

return {
Expand Down
47 changes: 47 additions & 0 deletions scripts/sync-leaderboard.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,47 @@ function getFileName(daysAgo) {
return `${year}-${month}-${date}-${day}.json`;
}

function updateUserHistory(user, DATA_DIR) {
const historyDir = path.join(DATA_DIR, "historical-user-data");
if (!fs.existsSync(historyDir)) {
fs.mkdirSync(historyDir, { recursive: true });
}

const userHistoryPath = path.join(historyDir, `${user.id}.json`);
let history = [];

if (fs.existsSync(userHistoryPath)) {
try {
history = JSON.parse(fs.readFileSync(userHistoryPath, "utf8"));
} catch (err) {
console.error(
`Failed to parse history for ${user.id}, resetting:`,
err.message,
);
}
}

const dateStr = getFileName(0).split("-").slice(0, 3).join("-");
const existingIndex = history.findIndex((entry) => entry.date === dateStr);

const newEntry = {
date: dateStr,
easy: user.data.easySolved,
medium: user.data.mediumSolved,
hard: user.data.hardSolved,
};

if (existingIndex !== -1) {
history[existingIndex] = newEntry;
} else {
history.push(newEntry);
}

history.sort((a, b) => new Date(a.date) - new Date(b.date));

fs.writeFileSync(userHistoryPath, JSON.stringify(history, null, 2), "utf8");
}

function assignCompetitionRanks(sortedData) {
let currentRank = 1;
for (let i = 0; i < sortedData.length; i++) {
Expand Down Expand Up @@ -165,6 +206,12 @@ async function computeRankChanges(currentSorted, filename) {
try {
fs.writeFileSync(filepath, JSON.stringify(overallData, null, 2), "utf8");
console.log("Daily data saved successfully");

console.log("Updating historical user files...");
overallData.forEach((user) => {
updateUserHistory(user, DATA_DIR);
});
console.log("Historical user files updated successfully");
} catch (err) {
console.error(`Failed to write json file: `, err.message);
process.exit(1);
Expand Down
Loading