爬取币安公告页面，观察近两次的下架信息，具体格式为“Binance将下架CLOAK、MOD、SALT、SUB、WINGS”、“Binance将下架BCN，CHAT，ICN，TRIG”。
爬虫将以“将下架”为关键词爬取新的下架公告，当然不排除币安更改公告格式，可参考此策略加以完善。由于爬虫任务过于简单，将用简单的JavaScript编写。爬取到下架币后，将检查账户信息，如果存在下架币，以较低的价格全部卖出，如果存在未完成订单，先撤销。直到将所持有的下架币完全卖出。 具体分析，参考帖子：https://zhuanlan.zhihu.com/p/57012933
var exchangeInfo = JSON.parse(HttpQuery('https://api.binance.com/api/v1/exchangeInfo'))
var pairInfo = {}
var downList = []
if(exchangeInfo){
for (var i=0; i<exchangeInfo.symbols.length; i++){
var info = exchangeInfo.symbols[i];
pairInfo[info.symbol] = {minQty:parseFloat(info.filters[2].minQty),tickerSize:parseFloat(info.filters[0].tickSize),
stepSize:parseFloat(info.filters[2].stepSize), minNotional:parseFloat(info.filters[3].minNotional)}
}
}else{
Log('fail to get exchangeInfo')
}
function sellAll(coin, free){
var symbol = coin + 'BTC'
exchange.IO("currency", coin+'_BTC')
var ticker = _C(exchange.GetTicker)
var sellPrice = _N(ticker.Buy*0.7, parseInt((Math.log10(1.1/pairInfo[symbol].tickerSize))))
var sellAmount = _N(free, parseInt((Math.log10(1.1/pairInfo[symbol].stepSize))))
if (sellAmount > pairInfo[symbol].minQty && sellPrice*sellAmount > pairInfo[symbol].minNotional){
var id = exchange.Sell(sellPrice, sellAmount, symbol)
exchange.CancelOrder(order.orderId)
}
}
function cancellOrder(){
var openOrders = exchange.IO('api', 'GET', '/api/v3/openOrders')
for (var i=0; i<openOrders.length; i++){
var order = openOrders[i];
for (var j=0;j<downList.length;j++){
if(order.symbol.startsWith(downList[j])){
var currency = downList[j] + '_' + order.symbol.slice(downList[j].length);
Log('delist coin exist, cancel all orders first', currency)
exchange.IO("currency", currency)
exchange.CancelOrder(order.orderId)
}
}
}
}
function checkAccount(){
var done = false
while(!done){
account = _C(exchange.GetAccount)
done = true
for (var i=0; i<account.Info.balances.length; i++){
if(downList.indexOf(account.Info.balances[i].asset)>-1 && parseFloat(account.Info.balances[i].free)>pairInfo[account.Info.balances[i].asset+'BTC'].minQty){
Log('this coin will be dumped', account.Info.balances[i].asset)
sellAll(account.Info.balances[i].asset, parseFloat(account.Info.balances[i].free))
done = false
}
}
Sleep(1000)
}
Log('sell done')
}
function main() {
var title = ''
while(true){
var html = HttpQuery('https://support.binance.com/hc/en-us/sections/115000202591-Latest-News')
html = html.slice(html.indexOf('Delist '),html.length)
if(html){
if(html.slice(7,html.indexOf('</a>')) != title){
title = html.slice(7,html.indexOf('</a>'))
downList = html.slice(7,html.indexOf('</a>')).replace(' and ', ',').split(',')
Log('new announcement，will delist:', downList)
cancellOrder()
checkAccount()
}else{
Log('new announcement was not found')
}
}else{
Log('web spider wrong')
}
Sleep(60*1000)
}
}