Function execute_task

apps/backend/main.js:204–371

* @brief Execute audio transcription task using WhisperX * * This function handles the complete lifecycle of a transcription task: * 1. Task selection and validation * 2. Python subprocess execution for transcription * 3. Result processing and file cleanup * 4. Status updates and

()

   * @return {Promise<void>} Resolves when task completes or fails
   */
   async function execute_task() {
    var task_objid = 0;
    var task_filename = '';
    var task_diarize = 0; // Speaker Diarization

    try {
      const selected_task = await select_task();      
      
      // Check if selected_task is null 
      if (!selected_task) {
        return;  // Exit if selected_task is null or has no records
      }

      task_objid = selected_task.OBJID;
      task_filename = selected_task.FILENAME;
      task_diarize = selected_task.DIARIZE;
      
      logger(LOG_LEVEL.INFO, `Execution of the task ${task_objid} has begun.`);   
      
    } catch (err) {
      logger(LOG_LEVEL.ERROR, `execute_task ${err}.`);
      return;
    }
    
    // Ensure this path is the correct path to Python in your Anaconda environment
    const python_bin = `${cfg.paths.python_bin}`;
    // The python script to run whisperx
    const transcribe_script_path = `${cfg.paths.task_script_path}/${cfg.paths.task_script}`;
    const transcribe_txt_path = cfg.paths.transcribe_txt_path;

    const parsed = path.parse(task_filename);
    
    update_task({
      objid: task_objid, 
      pid: process.pid,
      status: TASK_STATUS.IN_PROGRESS
    });          
    
    // chcp 65001 ensures that when Node.js calls a Python script, and it involves 
    // outputting Unicode characters to Windows cmd (default cp950 encoding), errors 
    // may occur due to incompatible encodings. Therefore, before calling exec 
    // in the Node.js script, you can set the Windows cmd encoding to UTF-8 (i.e., chcp 65001), 
    // which allows for the correct handling of Unicode characters. 
    // Execute the script using Python from the Anaconda environment, where 'chcp 65001 > null' 
    // directs the message from changing the encoding to null.
    // child_process = exec(`chcp 65001 >nul && ${python_bin} ${python_script_path} ${task_filename}`, (err, stdout, stderr) => { 
    // Use spawn instead of exec
    child_process = spawn(python_bin, [transcribe_script_path, task_filename, task_diarize]);

    // Listen to stdout data
    child_process.stdout.on('data', (data) => {
      if (__DEV__)
        logger(LOG_LEVEL.INFO, `execute_task (transcribe script) stdout:\n${data}`);
    });

    // Listen to stderr data
    child_process.stderr.on('data', (data) => {
      if (__DEV__)