Examples: handling Qencode callbacks

Examples/callback_test/README.md

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+# Callback sample scripts  
+Example of sending job with callback_url and payload
+
+- testCallback.js: launches a transcoding job specifying a "callback_url" param and payload for the job.
+- callback_handler.js: server side script to accept the callback request. The callback_url param for the job should contain a valid HTTP(S) URL where the callback_handler.js script is working.
+
+## Workflow
+1. Install prerequisites for callback_handler.js:
+```
+npm install express body-parser
+``` 
+2. Launch callback_handler.js:
+```
+node callback_handler.js
+```
+By default it will start the HTTP service on port 3000, the callback url will be http://<your_host>:3000/callback  
+You can optionally use [ngrok](https://ngrok.com/) tool on localhost to provide you with a public URL:
+```
+ngrok http 3000
+```
+ngrok will provide a public URL (e.g., https://abc123.ngrok.io). Use this URL as the callback URL in Qencode's settings.
+3. Excute testCallback.js to run a test job. Don't forget to specify your Qencode API Key and your callback url.  
+
+You should see notifications on callback events in the callback_handler.js output.
+

Examples/callback_test/callback_handler.js

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+const express = require('express');
+const bodyParser = require('body-parser');
+
+const app = express();
+const port = 3000;
+
+// Middleware to parse URL-encoded bodies (as sent by HTML forms)
+app.use(bodyParser.urlencoded({ extended: true }));
+
+// POST endpoint to handle the callback
+app.post('/callback', (req, res) => {
+    // Extracting the task token and payload from the request body
+    const taskToken = req.body.task_token;
+    const event = req.body.event;
+    const payload = req.body.payload ? JSON.parse(req.body.payload) : null;
+
+    // Logging the task token and payload
+    console.log('Received Callback');
+    console.log('Task Token:', taskToken);
+    console.log('Event:', event)
+    if (payload) {
+        console.log('Payload:', payload);
+    }
+
+    // Sending a response back to the caller
+    res.send('Callback received');
+});
+
+app.listen(port, () => {
+    console.log(`Server listening at http://localhost:${port}`);
+});

Examples/callback_test/testCallback.js

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+(async function () {
+
+  const QencodeApiClient = require('qencode-api');
+
+  const apiKey = "your_api_key_here";
+
+  const payload = '{"test": "payload data"}';
+
+  let transcodingParams = {
+      "source": "https://nyc3.s3.qencode.com/qencode/bbb_30s.mp4",
+      "format": [
+        {
+          "output": "metadata"
+        }
+      ],
+      "callback_url": "https://abc123.ngrok-free.app/callback"
+    };
+
+
+
+  const qencodeApiClient = await new QencodeApiClient(apiKey);
+  console.log("AccessToken: ", qencodeApiClient.AccessToken);
+
+  let task = await qencodeApiClient.CreateTask();
+  console.log("Created new task: ", task.taskToken);
+
+  await task.StartCustom(transcodingParams, payload);
+  console.log("Status URL: ", task.statusUrl);
+
+
+  // example on how to get status
+  CheckTaskStatus();
+
+  async function CheckTaskStatus(){
+      let statusObject = await task.GetStatus()
+      let status = statusObject.status
+      while (status != "completed") {
+          statusObject = await task.GetStatus()
+          status = statusObject.status;
+          progress = statusObject.percent;
+          console.log(`task: ${task.taskToken} | status: ${status} | progress: ${progress}`);
+          await sleep(10000);
+      }
+  }
+
+  function sleep(ms){
+      return new Promise(resolve=>{
+          setTimeout(resolve,ms)
+      })
+  }    
+
+
+})();
+