66 lines
No EOL
1.9 KiB
JavaScript
66 lines
No EOL
1.9 KiB
JavaScript
const fs = require('fs');
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const v8 = require('v8');
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const express = require('express');
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const router = express.Router();
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const location = '/tmp/';
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let creationStatus = null;
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let fileName = null;
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async function createHeapSnapshot() {
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if (creationStatus) {
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return console.log(`In progress ${fileName}`);
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}
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if (fileName === null) {
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fileName = `${Date.now()}.heapsnapshot`;
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}
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console.log(`Creating ${fileName}`);
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await fs.promises.writeFile(
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location + fileName,
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v8.getHeapSnapshot()
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);
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console.log(`Created ${fileName}`);
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creationStatus = true;
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}
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async function downloadHeapSnapshot(req, res) {
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if (creationStatus === null) {
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return res.end("should call /new first");
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} else if (!creationStatus) {
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return res.end("should wait for done status");
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}
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res.download(location + fileName, function (err) {
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if (err) {
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return console.error("error while uploading HeapSnapshot file");
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}
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try {
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fs.unlinkSync(location + fileName)
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} catch (err) {
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console.error("error while deleting heapsnapshot file");
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console.error(err);
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}
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});
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}
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function getHeapSnapshotStatus(req, res) {
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res.statusCode = 200;
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res.setHeader('Content-Type', 'application/json');
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res.end(JSON.stringify({path: location + fileName, 'done': creationStatus}));
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}
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function createNewHeapSnapshot(req, res) {
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creationStatus = false;
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fileName = `${Date.now()}.heapsnapshot`;
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setTimeout(() => {
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createHeapSnapshot()
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}, 0);
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res.statusCode = 200;
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res.setHeader('Content-Type', 'application/json');
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res.end(JSON.stringify({path: location + fileName, 'done': creationStatus}));
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}
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router.get(`/status`, getHeapSnapshotStatus);
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router.get(`/new`, createNewHeapSnapshot);
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router.get(`/download`, downloadHeapSnapshot);
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module.exports = {router} |