47 lines
1.7 KiB
JavaScript
47 lines
1.7 KiB
JavaScript
const http = require("http");
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const Redis = require("ioredis");
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const redis = new Redis({ host: process.env.REDIS_HOST || "data_jobs",
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port: Number(process.env.REDIS_PORT || 6379) });
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const JOBS = process.env.JOB_QUEUE || "grist:jobs";
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const RESULTS = process.env.RESULT_QUEUE || "grist:results";
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http.createServer(async (req, res) => {
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if (req.method === "POST" && req.url === "/api/job") {
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const stream = await readJsonBody(req); // JSON Stream vom Client. mit readJsonBody() wieder zurück in JSON.
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await redis.lpush(JOBS, JSON.stringify(stream)); // Job in Queue. Als String in Redis eintragen. Der Worker nimmt dann den String.
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const reply = await redis.blpop(RESULTS, 30); // auf Antwort warten
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const value = reply[1]; // Worker-Response
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res.writeHead(200, {"content-type":"application/json"});
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try {
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JSON.parse(value); res.end(value); //Prüfen für JSON
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} catch {
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res.end(JSON.stringify({ //Fallback damit es sicher ein JSON ist.
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ok:true,
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data:value
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}));
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}
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}
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//mit curl http://192.168.0.104:8080/health kann man checken ob das Gateway überhaupt arbeitet.
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if (req.method === "GET" && req.url === "/health") {
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res.writeHead(200, { "content-type":"text/plain" });
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return res.end("ok");
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}
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res.writeHead(404, { "content-type":"text/plain" });
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res.end("not found");
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}).listen(8080, "0.0.0.0", () => console.log("[gateway] listening 8080"));
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//DataStream in Json zurückverwandeln.
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function readJsonBody(req){
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return new Promise((resolve) => {
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let buf = "";
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req.on("data", c => buf += c);
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req.on("end", () => resolve(buf ? JSON.parse(buf) : null));
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});
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}
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