How to Capture Command Output in Real Time from a Chat Bot?

How to Capture Output from a Command Execution in Real Time

Issue:

When executing commands from within a chat bot, the stdout output is returned all at once at the end of the command. To achieve real-time output, there's a need to modify its execution to write in real time.

Proposed Solution:

The function provided collects stdout output all at once and returns it upon completion. We can improve on this by using a pipe to capture the output in real time.

Implementation:

<code class="go">package main

import (
    "os"
    "os/exec"
    "fmt"
    "bufio"
)

func main() {
    cmd := exec.Command("tail", "-f",  "/usr/local/var/log/redis.log")

    // create a pipe for the output of the script
    cmdReader, err := cmd.StdoutPipe()
    if err != nil {
        fmt.Fprintln(os.Stderr, "Error creating StdoutPipe for Cmd", err)
        return
    }

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

    err = cmd.Start()
    if err != nil {
        fmt.Fprintln(os.Stderr, "Error starting Cmd", err)
        return
    }

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

Using this approach, the stdout output from the executed command will be streamed to the chat channel in real time, allowing for immediate feedback and interactive communication.

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