dougao2830 2018-11-06 14:39
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PHP / Python / Bash模拟器

I am having to accomplish a custom terminal using PHP/JS/Python on a LAMP stack server to be able to execute scripts. I am able to: generate the command to be executed, run the script, and return the output. There are scripts that must be run that have a continuous (endless loop) that are to be killed using kill PID. However, I need to be able to call the output from the Python script that is running in the background. Example:

/*** PHP ***/
  <?php
    // AJAX call return
    $data = (object) array();
    $data->command = $_POST['command'];
    exec('python3 ' . $data->command . ' > /dev/null &', $data->output, $data->err);
    die(json_encore($data));
  ?>

/*** HTML ***/
  <HTML>
    <head>
      function submitForm(){
        //... function submits and returns json_object using AJAX
        var data = JSON.parse(__return__);
        var pre = document.createElement("PRE");
        for(var index = 0; index < data.output.length; index++){
          pre.innerHTML += data.output[index] + "<br>";
        }
        document.getElementById("output").append(pre);
      }
    </head>
    <body>
      <div id='output'></div>
      <input type='TEXT' id='command' onchange='submitForm();'/>
    </body>
  </HTML>

/*** PYTHON ***/
  #!/usr/bin/env python3
  import time;
  n = 0;
  while n < 5:
    print("THIS IS THE OUTPUT I NEED TO RETURN TO JSON");
    time.sleep(1);

Issue: When I send the command as a single command, it returns the output; when I send the command to start a script, it returns null; how can I call the output as a JSON object to get the python script output that is run from the python script above.

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1条回答 默认 最新

  • doucitao2944 2018-11-06 15:39
    关注

    To get full input, output and error detail we need to use proc_open function in php. Php function reference can be consulted here

    <?php

    $data = (object) array();
    $data->command = $_POST['command'];

    $descriptorspec = array(
        0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
        1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
        2 => array("pipe", "r")   // stderr is a pipe to read from
    );

    $process = proc_open('python3 ' . $data->command, $descriptorspec, $pipes);
    //It is always a good idea to put full path e.g /usr/bin/python3
    stream_set_blocking($pipes[2], 0); //setting non-blocking on stderr
    fclose($pipes[0]); //closing input

    $data->output = stream_get_contents($pipes[1]); //reading output
    fclose($pipes[1]); //closing output

    $data->err = stream_get_contents($pipes[2]); //reading stderr
    fclose($pipes[2]); //closing stderr

    die(json_encode($data));
?>
    评论

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