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feat: support resume for mainframe ZIP downloads #10

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Copilot Apr 17, 2026
354309a
feat: support resume for mainframe ZIP downloads
Copilot Apr 17, 2026
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118 changes: 77 additions & 41 deletions lib/commands/serve/streempublic.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,51 +14,87 @@ const getFile = (url, dest) => new Promise((resolve, reject) => {
maximumFractionDigits: 2
});

var file = fs.createWriteStream(dest);
var request = http.get(url, function (response) {
const contentLength = response.headers['content-length'];
const totalBytes = contentLength ? parseInt(contentLength, 10) : NaN;
let downloadedBytes = 0;

if (isNaN(totalBytes)) {
warn('Missing or invalid "Content-Length" header. Progress bar will be skipped.');
}

response.on('data', (chunk) => {
downloadedBytes += chunk.length;

if (!isNaN(totalBytes)) {
if (downloadedBytes < totalBytes) {
const downloadedPercentage = downloadedBytes / totalBytes;
const formattedDownloadPercentage = percentFormatter.format(downloadedPercentage);
const barLength = Math.max(MIN_BAR_LENGTH, terminalWidth - BASE_DOWNLOAD_MESSAGE.length);
const filledLength = Math.round(barLength * downloadedPercentage);
const bar = '█'.repeat(filledLength) + '-'.repeat(barLength - filledLength);

process.stdout.write(`\rDownloading MainFrame Xpublic Zip: ${formattedDownloadPercentage} [${bar}]`);
} else {
process.stdout.write('\n');
}
const existingBytes = fs.existsSync(dest) ? fs.statSync(dest).size : 0;

function startDownload(resumeFrom) {
const file = resumeFrom > 0
? fs.createWriteStream(dest, { flags: 'a' })
: fs.createWriteStream(dest);

const makeRequest = (callback) => resumeFrom > 0
? http.get(url, { headers: { 'Range': `bytes=${resumeFrom}-` } }, callback)
: http.get(url, callback);

makeRequest(function (response) {
const isResuming = response.statusCode === 206;

if (resumeFrom > 0 && response.statusCode === 200) {
warn('Server does not support resumable downloads. Starting fresh download.');
file.destroy();
fs.unlink(dest, (unlinkErr) => {
if (unlinkErr) { error(unlinkErr); }
startDownload(0);
});
return;
}
});

response.pipe(file);
response.on('error', (err) => {
fs.unlink(dest, () => reject(err));
});
if (response.statusCode === 416) {
file.destroy();
resolve();
return;
}

file.on('error', (err) => {
fs.unlink(dest, () => reject(err));
});
file.on('finish', function () {
file.close(() => resolve());
const contentLength = response.headers['content-length'];
const responseBytes = contentLength ? parseInt(contentLength, 10) : NaN;
const totalBytes = isResuming ? resumeFrom + responseBytes : responseBytes;
let downloadedBytes = isResuming ? resumeFrom : 0;

if (isResuming) {
console.log(`Resuming MainFrame Xpublic Zip download from byte ${resumeFrom}...`);
}

if (isNaN(totalBytes)) {
warn('Missing or invalid "Content-Length" header. Progress bar will be skipped.');
}

response.on('data', (chunk) => {
downloadedBytes += chunk.length;

if (!isNaN(totalBytes)) {
if (downloadedBytes < totalBytes) {
const downloadedPercentage = downloadedBytes / totalBytes;
const formattedDownloadPercentage = percentFormatter.format(downloadedPercentage);
const barLength = Math.max(MIN_BAR_LENGTH, terminalWidth - BASE_DOWNLOAD_MESSAGE.length);
const filledLength = Math.round(barLength * downloadedPercentage);
const bar = '█'.repeat(filledLength) + '-'.repeat(barLength - filledLength);

process.stdout.write(`\rDownloading MainFrame Xpublic Zip: ${formattedDownloadPercentage} [${bar}]`);
} else {
process.stdout.write('\n');
}
}
});

response.pipe(file);
response.on('error', (err) => {
fs.unlink(dest, () => reject(err));
});

file.on('error', (err) => {
fs.unlink(dest, () => reject(err));
});
file.on('finish', function () {
file.close(() => resolve());
});
}).on('error', function (err) {
error('Main Frame URL could not be found. Please make sure .development.env file has the correct MAINFRAME_URL settings.');
error(err);
fs.unlink(dest, () => {});
reject(err);
});
}).on('error', function (err) {
error('Main Frame URL could not be found. Please make sure .development.env file has the correct MAINFRAME_URL settings.');
error(err);
fs.unlink(dest);
reject(err);
});
}

startDownload(existingBytes);
});

exports.prapereDevPub = async function (api, pubzipurl) {
Expand Down