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| import express from "express" | |
| import { HfInference } from '@huggingface/inference' | |
| import { daisy } from "./daisy.mts" | |
| const hfi = new HfInference(process.env.HF_API_TOKEN) | |
| const hf = hfi.endpoint(process.env.HF_ENDPOINT_URL) | |
| const app = express() | |
| const port = 7860 | |
| const minPromptSize = 16 // if you change this, you will need to also change in public/index.html | |
| const timeoutInSec = 30 * 60 | |
| console.log("timeout set to 30 minutes") | |
| app.use(express.static("public")) | |
| const pending: { | |
| total: number; | |
| queue: string[]; | |
| } = { | |
| total: 0, | |
| queue: [], | |
| } | |
| const endRequest = (id: string, reason: string) => { | |
| if (!id || !pending.queue.includes(id)) { | |
| return | |
| } | |
| pending.queue = pending.queue.filter(i => i !== id) | |
| console.log(`request ${id} ended (${reason})`) | |
| } | |
| app.get("/debug", (req, res) => { | |
| res.write(JSON.stringify({ | |
| nbTotal: pending.total, | |
| nbPending: pending.queue.length, | |
| queue: pending.queue, | |
| })) | |
| res.end() | |
| }) | |
| app.get("/app", async (req, res) => { | |
| const model = `${req.query.model || 'OpenAssistant/oasst-sft-4-pythia-12b-epoch-3.5'}` | |
| console.log('model:', model) | |
| const endpoint = `${req.query.endpoint || ''}` | |
| console.log('endpoint:', endpoint) | |
| if (`${req.query.prompt}`.length < minPromptSize) { | |
| res.write(`prompt too short, please enter at least ${minPromptSize} characters`) | |
| res.end() | |
| return | |
| } | |
| const id = `${pending.total++}` | |
| console.log(`new request ${id}`) | |
| pending.queue.push(id) | |
| const prefix = `<html><head><link href="https://cdn.jsdelivr.net/npm/daisyui@3.1.6/dist/full.css" rel="stylesheet" type="text/css" /><script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script><script src="https://cdn.tailwindcss.com?plugins=forms,typography,aspect-ratio,line-clamp"></script><title>Generated content</title><body` | |
| res.write(prefix) | |
| req.on("close", function() { | |
| // console.log("browser asked to close the stream for some reason.. let's ignore!") | |
| endRequest(id, "browser asked to end the connection") | |
| }) | |
| // for testing we kill after some delay | |
| setTimeout(() => { | |
| endRequest(id, `timed out after ${timeoutInSec}s`) | |
| }, timeoutInSec * 1000) | |
| const finalPrompt = `# Task | |
| Generate the following: ${req.query.prompt} | |
| # API Documentation | |
| ${daisy} | |
| # Guidelines | |
| - Never repeat the instruction, instead directly write the final code | |
| - Use a color scheme consistent with the brief and theme | |
| - You must use Tailwind CSS and Daisy UI for the CSS classes, vanilla JS and Alpine.js for the JS. | |
| - All the JS code will be written directly inside the page, using <script type="text/javascript">...</script> | |
| - You MUST use English, not Latin! (I repeat: do NOT write lorem ipsum!) | |
| - No need to write code comments, so please make the code compact (short function names etc) | |
| - Use a central layout by wrapping everything in a \`<div class="flex flex-col items-center">\` | |
| # HTML output | |
| <html><head></head><body` | |
| try { | |
| let result = '' | |
| for await (const output of hf.textGenerationStream({ | |
| inputs: finalPrompt, | |
| parameters: { max_new_tokens: 1024 } | |
| })) { | |
| if (!pending.queue.includes(id)) { | |
| break | |
| } | |
| result += output.token.text | |
| process.stdout.write(output.token.text) | |
| res.write(output.token.text) | |
| if (result.includes('</html>')) { | |
| break | |
| } | |
| if (result.includes('<|end|>') || result.includes('<|assistant|>')) { | |
| // it ended, but we probably don't have a valid HTML | |
| break | |
| } | |
| } | |
| endRequest(id, `normal end of the LLM stream for request ${id}`) | |
| } catch (e) { | |
| console.log(e) | |
| endRequest(id, `premature end of the LLM stream for request ${id} (${e})`) | |
| } | |
| try { | |
| res.end() | |
| } catch (err) { | |
| console.log(`couldn't end the HTTP stream for request ${id} (${err})`) | |
| } | |
| }) | |
| app.listen(port, () => { console.log(`Open http://localhost:${port}`) }) | |