@fruitsjs/monitor
A monitor to watch for specific changes on the the Fruits Eco-Blockchain platform
Due to average blocktime of 240 seconds, transactions stay pending for a certain time. It is a repeating pattern to watch for such changes and waiting for confirmation. This package simplifies this task.
Installation
@fruitsjs/monitor
can be used with NodeJS or Web.
Using with NodeJS and/or modern web frameworks
Install using npm:
npm install @fruitsjs/monitor
or using yarn:
yarn add @fruitsjs/monitor
Example
import {Monitor} from '@fruitsjs/monitor'
import {composeApi} from "@fruitsjs/core";
// A method that checks if an account exists
// > IMPORTANT: Do not use closures, when you need to serialize the monitor
async function tryFetchAccount() {
const api = composeApi({ nodeHost: 'https://testnet.fwallet.net/'})
try{
const {account} = await api.account.getAccount('1234')
return account;
}catch (e){
// ignore error
return null;
}
}
// A comparing function to check if a certain condition for the returned data from fetch function
// is true. If it's true the monitor stops
function checkIfAccountExists(account) {
return account !== null;
}
// Create your monitor
const monitor = new Monitor({
asyncFetcherFn: tryFetchAccount,
compareFn: checkIfAccountExists,
intervalSecs: 10, // polling interval in seconds
key: 'monitor-account',
timeoutSecs: 2 * 240 // when reached timeout the monitor stops
});
// starts monitor
monitor.start();
// called when `checkIfAccountExists` returns true
monitor.onFulfilled(() => {
console.log('Yay, account active');
});
// called when `timeoutSecs` is reached
monitor.onTimeout(() => {
console.log('Hmm, something went wrong');
});