short script to request android chrome's tab info via adb.

domain-socket.js

// Before run this script, you should connect your android device on your machine.
var net = require('net');
var cmds = [
  {
    cmd : 'host:transport-any',
    expect : function(res) {
      return 'OKAY' === res;
    }
  },
  {
    cmd : 'localabstract:chrome_devtools_remote',
    expect : function(res) {
      return 'OKAY' === res;
    }
  },
  {
    cmd : 'GET /json HTTP/1.1\r\n\r\n',
    expect : function(res) {
      return true;
    }
  }
]

function prefixLen(cmd) {
  var hexlen = cmd.length.toString(16);
  var prefix = ('000'.concat(hexlen)).slice(-4);
  return prefix.concat(cmd);
}

var socket = new net.Socket({
  readable : true,
  writable : true,
  allowHalfOpen : true
});

socket.writeData = function() {
  var data = this.cmds.shift();
  if (!data) return;

  this.expect = data.expect;
  this.write(prefixLen(data.cmd));
}

socket.writeNext = function(res) {
  if (this.expect && this.expect(res))
    this.writeData();
}

socket.connect({port: '5037'}, function() {
  this.cmds = cmds;
  this.writeData();
  this.on('data', function(chunk) {
    var res = chunk.toString();
    console.log(res);
    this.writeNext(res);
  });
  this.on('drain', function() {
    console.log('drain');
  });
  this.on('end', function() {
    console.log('FIN');
  });
});