install
npm i websocket @types/websocket
usage
共通化
const websocket = <T>(url: string, onmessage: (t: T) => void, onerror?: (e: any) => void, onclose?: () => void) => {
const webClient = require("websocket").client
const client: client = new webClient()
client.on('connect', (con: connection) => {
console.log(`connected ${con.connected}`)
con.on('error', (e: any) => console.error(e))
con.on('close', () => console.log("websockets closed."))
con.on('message', (message: Message) => {
if (message.type === "utf8") {
const t = JSON.parse(message.utf8Data) as T
onmessage(t)
}
})
if (onerror) {
con.on('error', onerror)
}
if (onclose) {
con.on('close', onclose)
}
})
client.connect(url)
}
利用例
この例では、仮想通貨取引所binanceへbtcusdt, xrpusdtの約定データをサブスクライブしている。
interface AggTrade {
e: string
E: number
a: number
s: string
p: string
q: string
f: number
l: number
T: number
m: boolean
}
function test(){
websocket<AggTrade>("wss://fstream.binance.com/ws/" + "btcusdt@aggTrade", t => console.log(`Pare:${t.s}`))
websocket<AggTrade>("wss://fstream.binance.com/ws/" + "xrpusdt@aggTrade", t => console.log(`Pare:${t.s}`))
return
}
test()
実行結果
Pare:BTCUSDT
Pare:BTCUSDT
Pare:BTCUSDT
Pare:XRPUSDT
Pare:BTCUSDT
Pare:BTCUSDT
Pare:BTCUSDT
Pare:BTCUSDT
Pare:BTCUSDT
Pare:XRPUSDT
Pare:XRPUSDT
Pare:XRPUSDT
Pare:BTCUSDT
Document
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