I would this function to run every 5 seconds and get new data. The getGas() function is an async-await function in and of itself and works fine if I just call let gas = await getGas();. The issue is that I need it to run every 5 seconds and get a new gas price. I'm having trouble understanding how to call this function and have it run every 5 seconds.
async function main() {
// get the current gwei prices & new price every 5 seconds
let gas = async () => {
setTimeout(() => {
await getGas();
}, 5000);
};
console.log(gas);
// other code down here
}
hmm.. I would just make the setTimeout a Promise in itself and then have gas as an async function to call..
async function main() {
// get the current gwei prices & new price every 5 seconds
let gas = async () => {
return new Promise(r=>{
setTimeout(async()=>r(await getGas()),5e3);
})
}
console.log(await gas()); //whatever getGas should be
// other code down here
//whenever you want gas, you can just "await gas()"
}
However.. if you just didn't word your question correctly and you want the variable gas to be updated every 5 seconds in that block of code within recalling main
an async function to call..
async function main() {
// get the current gwei prices & new price every 5 seconds
let gas = null; //starting value
setInterval(async()=>gas=await getGas(),5e3); //every 5 seconds, gas is updated
console.log(gas); //null
setTimeout(()=>console.log(gas),6e3); //whatever getGas should be
// other code down here
//whenever you want gas, you can just "gas"
}
EDIT: you told me it doesn't work so I give a live example and am now asking how
async function getGas(){
return Math.floor(Math.random()*5)
}
async function main1() {
// get the current gwei prices & new price every 5 seconds
let gas = async () => {
return new Promise(r=>{
setTimeout(async()=>r(await getGas()), 5e3);
})
}
setInterval(async()=>
console.log(await gas(),"~ main1") //whatever getGas should be
,1e3);
// other code down here
//whenever you want gas, you can just "await gas()"
}
async function main2() {
// get the current gwei prices & new price every 5 seconds
let gas = null; //starting value
setInterval(async()=>gas=await getGas(),5e3); //every 5 seconds, gas is updated
console.log(gas); //null
setInterval(()=>
console.log(gas,"~ main2") //whatever getGas should be
,1e3);
// other code down here
//whenever you want gas, you can just "gas"
}
main1(); main2();If you want to use setTimeout for that then the callback needs to invoke the function that calls setTimeout again, e.g.
(async function main() {
const gas = await getGas();
// do stuff with gas
setTimeout(main, 5000); // call main again after 5 seconds
}());
Your setTimeout doesn't need to be wrapped in its own async function. Just call main, log the data, and then call main again.
function mockApi(page) {
return new Promise((res, rej) => {
setTimeout(() => res(page), 1000);
});
}
async function main(page = 1) {
const data = await mockApi(page);
console.log(`Data: ${data}`);
setTimeout(main, 1000, ++page);
}
main();