Created
February 20, 2017 17:53
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stream trading events from Luno.com
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var WebsocketClient = require('websocket').client, | |
colors = require('colors'), | |
sprintf = require('sprintf-js').sprintf; | |
var ws = new WebsocketClient(); | |
var asks = bids = {}; | |
var now = function () { | |
var date = new Date(); | |
return sprintf("%02d:%02d:%02d", date.getHours(), date.getMinutes(), date.getSeconds()); | |
} | |
ws.on('connect', function (conn) { | |
console.log('connection established.'); | |
conn.on('message', function (msg) { | |
var data = JSON.parse(msg.utf8Data); | |
if (data == "") return; | |
if (data.trade_updates) { | |
data.trade_updates.forEach(function (trade) { | |
var price = trade.order_id in asks ? asks[trade.order_id].price : bids[trade.order_id].price; | |
console.log(sprintf("%16s %-15s %11s %15s %10s", "TRADE".white, trade.order_id, trade.base, price, now())); | |
}); | |
} | |
if (data.create_update) { | |
if (data.create_update.type == "BID") { | |
bids[data.create_update.order_id] = {price: data.create_update.price, volume: data.create_update.volume}; | |
console.log(sprintf("%16s %-15s %11s %15s %10s", colors.green(data.create_update.type), data.create_update.order_id, data.create_update.volume, data.create_update.price, now())); | |
} else { | |
bids[data.create_update.order_id] = {price: data.create_update.price, volume: data.create_update.volume}; | |
console.log(sprintf("%16s %-15s %11s %15s %10s", colors.yellow(data.create_update.type), data.create_update.order_id, data.create_update.volume, data.create_update.price, now())); | |
} | |
} | |
if (data.delete_update) { | |
if (data.delete_update.order_id in asks) { | |
console.log(sprintf("%16s %-15s %11s %15s %10s", "DELETE".red, data.delete_update.order_id, asks[data.delete_update.order_id].volume, asks[data.delete_update.order_id].price, now())); | |
delete asks[data.delete_update.order_id]; | |
} else if (data.delete_update.order_id in bids) { | |
console.log(sprintf("%16s %-15s %11s %15s %10s", "DELETE".red, data.delete_update.order_id, bids[data.delete_update.order_id].volume, bids[data.delete_update.order_id].price, now())); | |
delete bids[data.delete_update.order_id]; | |
} else { | |
console.log(sprintf("%16s %-15s %10s", "DELETE".red, data.delete_update.order_id, now())); | |
} | |
} | |
if (data.asks) { | |
asks = {}; | |
data.asks.forEach(function (ask) { | |
asks[ask.id] = {price: ask.price, volume: ask.volume}; | |
}); | |
} | |
if (data.bids) { | |
bids = {}; | |
data.bids.forEach(function (bid) { | |
bids[bid.id] = {price: bid.price, volume: bid.volume}; | |
}); | |
} | |
}); | |
conn.on('close', function () { | |
console.log('connected closed.'); | |
}); | |
conn.on('error', function (err) { | |
console.log('err:', err.toString()); | |
}); | |
conn.sendUTF(''); | |
}); | |
var options = ['NGN', 'ZAR', 'IDR', 'MYR', 'SGD']; | |
if (process.argv.length < 3 || options.indexOf(process.argv[2]) == -1) { | |
console.log('usage:', process.argv[1], '(' + options.join('|') + ')'); | |
process.exit(9); | |
} | |
ws.connect('wss://ws.bitx.co/XBT' + options.find(function (item) { return item == process.argv[2]; })); |
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