How to Achieve Real-Time Stdout Capture for Script Execution in a Chat Bot?

Executing Commands with Real-Time Stdout Capture

In order to enhance the functionality of a chat bot, the goal is to enable it to execute scripts and stream the stdout output directly into the chat. However, the current implementation stores the entire stdout until the conclusion of the script. To resolve this, we seek a solution that provides real-time output.

The current code utilizes the runcommand function to execute scripts and return their Stdout. To implement real-time output, we must decouple the execution and output processes. Let's modify the code to address this issue:

<code class="go">func reboot(command *bot.Cmd) (string, error) {
    n := command.Args[0]
    go runcommand(n)
    return "", nil
}</code>

The updated reboot function initiates the runcommand function as a goroutine. This allows the script execution to occur concurrently with the chat bot's interactions.

<code class="go">func runcommand(server string) {
    cmd := exec.Command("/bin/bash", "-c", "python test.py %s", server)
    cmdReader, err := cmd.StdoutPipe()
    if err != nil {
        fmt.Fprintln(os.Stderr, "Error creating StdoutPipe for Cmd", err)
        return
    }

    scanner := bufio.NewScanner(cmdReader)
    for scanner.Scan() {
        fmt.Printf("\t > %s\n", scanner.Text())
    }

    err = cmd.Run()
    if err != nil {
        fmt.Fprintln(os.Stderr, "Error starting Cmd", err)
        return
    }
}</code>

The modified runcommand function now uses a scanner to continuously monitor the Stdout of the script. Any output is immediately printed, achieving real-time stdout capture.

With these changes, the chat bot can effectively execute scripts and stream their stdout output into the chat in real time, providing an enhanced user experience.

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