How to use the log4js.info function in log4js

return this.nextProxy(host, cb)
  } else if(!AllowMultipleCalls && proxy.inUse) {
    // once we hit a proxy in use, we check if any other is free at the moment, 
    // if not, we sleep for a small amount of time
    if(!AllowMultipleCalls && this.allInUse()) {
      var that = this
      this.timeWaited+= UseWaitTime
      return setTimeout(function() {that.nextProxy(host, cb)}, UseWaitTime)
    }
    return this.nextProxy(host, cb)
  } else if(proxy.blocked) {
    // check if the block has timed out
    if(Date.now() < proxy.blocked.getTime() + BlockTimeout) {
      return this.nextProxy(host, cb)
    } else {
      logger.info('reviving blocked proxy ' + proxy.proxy + ' after ' + BlockTimeout + 'ms')  
      proxy.blocked = false
    }
  } else if(proxy.broken) {
    // check if the repair time is over
    if(Date.now() < proxy.broken.getTime() + RepairTime) {
      return this.nextProxy(host, cb)
    } else {
      logger.info('reviving broken proxy ' + proxy.proxy + ' after ' + RepairTime + 'ms')
      proxy.broken = false
    }
  }

  return cb(null, proxy)
}

function shutdown() {
  logger.info('shutting down')
  server.close()
  fs.writeFile('.proxies.tmp', JSON.stringify(Proxies.list), function () {
    process.exit(0)
  })
}

function reportStatus() {
  var status = Proxies.status()  
  status['wait (s)'] = Proxies.waitTime? Math.round(Proxies.waitTime / 1000): 0
  logger.info(JSON.stringify(status))
}

var Port            = Config.port, 
    DefaultTimeout  = Config.defaultTimeout,
    BindAddress     = Config.bindAddress,
    GraceTime       = Config.graceTime || 0,
    NextReqTimeout  = Config.nextRequestTimeout || 2000,
    BlockErrors     = ['ETIMEDOUT', 'ECONNRESET', 'EHOSTUNREACH', 'ESOCKETTIMEDOUT', 'ECONNREFUSED']

app.use(bodyParser.json());

app.get('/status', sendStatus)
app.get('/proxies', sendProxies)
app.post('/admin', admin)
app.get('/', handleRequest)

if(fs.existsSync('.proxies.tmp')) {
  logger.info('restoring previous state')
  fs.readFile('.proxies.tmp', function(err, json) {
    if(err) return logger.error(err)
    var dates = ['blocked', 'broken', 'lastRequest']
    Proxies.setList(JSON.parse(json))
    for(var i = 0; i < Proxies.list.length; i++) {
      var proxy = Proxies.list[i]
      proxy.inUse = false
      for(var key in proxy) {
        if(dates.indexOf(key) !== -1 && proxy[key] !== false) {
          proxy[key] = new Date(proxy[key])
        }
      }
    }
  })
}

function serverStarted() {
  logger.info('service running at http://%s:%s', 
    server.address().address, server.address().port);
}