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March 22, 2024 21:14
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| import path from 'path'; | |
| import express from 'express'; | |
| import fileUpload from 'express-fileupload'; | |
| import { pythonRunningProcess, spawnPythonProcess } from './spawn-python-process'; | |
| import { useRunningPythonServer } from './use-running-python-server'; | |
| const downloadsFolder = path.resolve(__dirname, './downloads'); | |
| let isProcessing = false; | |
| const requestQueue: Array<{ | |
| filePath: string; | |
| res: any; // Express response | |
| }> = []; | |
| async function processQueue() { | |
| if (requestQueue.length === 0) { | |
| isProcessing = false; | |
| return; | |
| } | |
| isProcessing = true; | |
| const firstEntry = requestQueue.shift(); | |
| if (!firstEntry) { | |
| return; | |
| } | |
| const { filePath, res } = firstEntry; | |
| try { | |
| const solution = await useRunningPythonServer(filePath); | |
| console.log('solution: ', solution); | |
| res.status(200).send(solution); | |
| processQueue(); | |
| } catch (error) { | |
| res.status(500).send(error); | |
| console.error(error); | |
| processQueue(); | |
| } | |
| } | |
| async function handleFileUpload(req, res) { | |
| try { | |
| if (!pythonRunningProcess) { | |
| return res.status(500).send('python process is not running'); | |
| } | |
| if (!req.files || Object.keys(req.files).length === 0) { | |
| return res.status(400).send('No files were uploaded'); | |
| } | |
| if (Object.keys(req.files).length > 1) { | |
| return res.status(400).send('Provide a single file'); | |
| } | |
| const imageFile = req.files.imageFile; | |
| const fileName = `image-${Date.now()}.png`; | |
| const filePath = path.join(downloadsFolder, fileName); | |
| console.log('filePath: ', filePath); | |
| // Use the mv() method to place the file somewhere on your server | |
| imageFile.mv(filePath, async function (err) { | |
| if (err) { | |
| return res.status(500).send(err); | |
| } | |
| requestQueue.push({ filePath, res }); | |
| if (isProcessing) { | |
| return; | |
| } | |
| processQueue(); | |
| }); | |
| } catch (err) { | |
| console.error(err); | |
| return res.status(500).send(err); | |
| } | |
| } | |
| export function runNodeListenerServer() { | |
| const app = express(); | |
| app.use( | |
| fileUpload({ | |
| limits: { fileSize: 20 * 1024 }, // 20 kb | |
| }) | |
| ); | |
| console.log('>>> runNodeListenerServer'); | |
| const PORT = 3456; | |
| app.listen(PORT, () => { | |
| console.log(`Server listening on port ${PORT}`); | |
| }); | |
| // spawn python process only once simultaneously with the server; | |
| // reuse it multiple times later | |
| spawnPythonProcess(); | |
| app.get('/recognise-image', (req, res) => res.status(200).send('python process is running')); | |
| app.post('/recognise-image', handleFileUpload); | |
| } | |
| runNodeListenerServer(); |
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