[英]Unable to write to socketio within Promise callback?
If I move socket.emit outside of that function, the socket emit event happens. 如果我将socket.emit移到该函数之外,则会发生套接字发射事件。 However, I need to get a hold of 'values' data, which is in the promise call back. 但是,我需要保留“值”数据,这在promise回调中。 The socket emit event in that case doesn't happen. 在这种情况下,套接字发射事件不会发生。
app.io.on('connection', function(socket) {
setInterval(function() {
var bitfinex = new Promise(
function(resolve, reject) {
const orderBook = 'https://api.bitfinex.com/v2/book/tBTCUSD/P0'
axios.get(orderBook)
.then(function(response) {
resolve(response)
})
.catch(function(error) {
reject(error)
});
});
var bitmex = new Promise(
function(resolve, reject) {
const orderBook = 'https://www.bitmex.com/api/v1/orderBook/L2?symbol=xbt&depth=25'
axios.get(orderBook)
.then(function(response) {
resolve(response)
})
.catch(function(error) {
reject(error)
});
});
Promise.all([bitmex, bitfinex]).then(values => {
socket.emit('feed', {
data: values
})
});
}, 3000)
Axios is returning a promise so you don't need to create new Promise and you should catch your error if there is any: Axios正在返回一个承诺,因此您无需创建新的Promise,并且如果存在任何错误,则应该捕获错误:
app.io.on(
'connection',
function (socket) {
setInterval(
function () {
Promise.all(
[
axios.get('https://api.bitfinex.com/v2/book/tBTCUSD/P0'),
axios.get('https://www.bitmex.com/api/v1/orderBook/L2?symbol=xbt&depth=25')
]
).then(values =>
socket.emit(
'feed',
{
data: values
}
)
)
.catch(
e => console.warn("something went wrong:",e)
)
},
3000
)
}
);
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