使用 Node.js 解析 JSON 对象

Question

我有一个运行并从 httpprovider 获取统计信息的小节点应用程序

它每秒以这种格式返回值：

{ WOWZA_CONNECTIONS_CURRENT: 21,
  WOWZA_CONNECTIONS_TOTAL: 4879,
  WOWZA_CONNECTIONS_BYTES_IN: 303242,
  WOWZA_CONNECTIONS_BYTES_OUT: 96372 }

但我需要它以不同的格式返回，就像这样：

WOWZA_CONNECTIONS_CURRENT 21 Rem-East-v4-Edge-1
WOWZA_CONNECTIONS_TOTAL 4879 Rem-East-v4-Edge-1
WOWZA_CONNECTIONS_BYTES_IN 303242 Rem-East-v4-Edge-1
WOWZA_CONNECTIONS_BYTES_OUT 96372 Rem-East-v4-Edge-1

我将如何做到这一点？

这是我的代码：

#!/usr/bin/env node

// Requires.
// request, jsdom, optimist, all of which can be install with npm.

// NOTE: -----------------------------------------------------------------------
// Uses jsdom 0.2.13, 0.2.14 has a bug
// https://github.com/tmpvar/jsdom/issues/436
// Install w/ npm via `npm install jsdom@0.2.13`
// -----------------------------------------------------------------------------

// Require modules.
var request = require('request'),
    jsdom = require('jsdom'),
    argv = require('optimist').argv;

// Make sure that at least the --uri argument was passed.
if (argv.uri.length == 0) {
  console.log('URI Required! Script should be called with one argument which is the URI of the connectioncounts HTTP provider to query.');
  return;
}

/**
 *
 */
var Collector = {
  stats: {},
  get_stats: function(uri, callback) {
    request({ uri: uri }, function (error, response, body) {
      if (error && response.statusCode !== 200) {
        console.log('Error when contacting ' + uri);
      }

      jsdom.env({
        html: body,
        scripts: [
          'http://code.jquery.com/jquery.min.js'
        ]
      }, function (err, window) {
        // User jQuery to Gather some stats from the connectioncounts HTTP
        // provider.
        var $ = window.jQuery;
        Collector.stats['WOWZA_CONNECTIONS_CURRENT'] = parseInt($('ConnectionsCurrent').html());
        Collector.stats['WOWZA_CONNECTIONS_TOTAL'] = parseInt($('ConnectionsTotal').html());
        Collector.stats['WOWZA_CONNECTIONS_BYTES_IN'] = parseFloat($('MessagesInBytesRate').html());
        Collector.stats['WOWZA_CONNECTIONS_BYTES_OUT'] = parseFloat($('MessagesOutBytesRate').html());
        callback(window);
      });
    });
  },
 }

/**
 * Wrap Collector.get_stats call in a closure it works better with setInterval.
 */
var callDelay = function() {
  Collector.get_stats(argv.uri, function(response) {
    // Print out collected stats.
    console.log(Collector.stats);
  });
}

// Get stats once right away.
callDelay();

// Allo repeating at specified interval if --repeat is set.
if (argv.repeat != undefined) {
  // Default to every 30 seconds if no delay is specified.
  if (argv.delay == undefined) {
    argv.delay = 30000;
  }
  setInterval(callDelay, argv.delay);
}

编辑： 通过更改代码链接的输出部分，我实现了所需的输出。

// Print out collected stats.
    //console.log(Collector.stats);
    console.log('WOWZA_CONNECTIONS_CURRENT ' + Collector.stats.WOWZA_CONNECTIONS_CURRENT + ' Rem-East-v4-Edge-1');
    console.log('WOWZA_CONNECTIONS_TOTAL ' + Collector.stats.WOWZA_CONNECTIONS_TOTAL + ' Rem-East-v4-Edge-1')
    console.log('WOWZA_CONNECTIONS_BYTES_IN ' + Collector.stats.WOWZA_CONNECTIONS_BYTES_IN + ' Rem-East-v4-Edge-1')
    console.log('WOWZA_CONNECTIONS_BYTES_OUT ' + Collector.stats.WOWZA_CONNECTIONS_BYTES_OUT + ' Rem-East-v4-Edge-1')

Answer 1

您不需要将其解析为 JSON，它已经存在于对象中。只需通过Collector.stats 访问即可按照您想要的方式构造一个字符串。