如何過濾Bitfinex API ws2流數據？

Question

我嘗試使用此代碼過濾來自WS流的具體數據：

bws.on('open',() => { 
    console.log('WS open') 
bws.subscribeTrades('BTCUSD') 

bws.on('trade', (pair, msg) => { 
    var trades = msg.map(function (msg) { 
     return { 
      trade_id: msg.ID, 
      time: msg.MTS, 
      size: Math.abs(msg.AMOUNT), 
      price: msg.PRICE, 
      side: msg.AMOUNT > 0 ? 'buy' : 'sell' 
     } 
    }) 
    console.log('Trades:\n', trades) 
}) 

我得到了一個未定義的數據：

WS open 
Trades: 
[ { 
<..> 
{ 
    trade_id: 43477863, 
    time: 1500037112000, 
    size: 0.01, 
    price: 2259.7, 
    side: 'buy' 
} ] 
Trades: 
[ { trade_id: undefined, 
    time: undefined, 
     size: NaN, 
     price: undefined, 
     side: 'sell' 
}, { 
     trade_id: 43478179, 
     time: 1500037170000, 
     size: 0.35702096, 
     price: 2259.9, 
     side: 'sell' 
} ] 
Trades: 
[ { trade_id: undefined, 
    time: undefined, 
    size: NaN, 
    price: undefined, 
    side: 'sell' 
}, { 
    trade_id: 43478179, 
    time: 1500037170000, 
    size: 0.35702096, 
    price: 2259.9, 
    side: 'sell' 
} ] 

這是第一塊流

[{ID:,MTS:,AMOUNT:,PRICE},{ID:,MTS:,AMOUNT:,PRICE:}] 

，然後更新與

['te',{ID:,MTS:,AMOUNT:,PRICE:}] 

和

['tu', {ID:,MTS:,AMOUNT:,PRICE:}] 

我想我得到「未定義」當發生這些更新。我如何管理？ 它已通過API解析JSON。

Answer 1

我有解決方案：

var wstrades = [] 
bws.on('open',() => { 
    console.log('WS open') 
bws.subscribeTrades('BTCUSD') 
bws.on('close',() => { 
    console.log('WS close') 
}) 
bws.on('trade', (pair, data) => { 
    wstrades.push({ 
    trade_id: data[1].ID, 
    time: data[1].MTS, 
    size: Math.abs(data[1].AMOUNT), 
    price: data[1].PRICE, 
    side: data[1].AMOUNT > 0 ? 'buy' : 'sell' 
    }) 
    var t = wstrades 
    var trades = t.map(function (trade) { 
    return (trade) 
    }) 
    console.log('Trades:\n', trades) 
}) 

雖然輸出有因 '德' 和 'TU' 更新副本：

Trades: 
[ { trade_id: 43683909, 
    time: 1500097172000, 
    size: 1, 
    price: 2109.8, 
    side: 'buy' }, 
    { trade_id: 43683913, 
    time: 1500097178000, 
    size: 0.0075, 
    price: 2109.8, 
    side: 'buy' }, 
    { trade_id: 43683914, 
    time: 1500097178000, 
    size: 0.9925, 
    price: 2110, 
    side: 'buy' }, 
    { trade_id: 43683913, 
    time: 1500097178000, 
    size: 0.0075, 
    price: 2109.8, 
    side: 'buy' } ] 

沒有 '未定義'。但無法過濾特定的數組...仍然打開。