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February 28, 2017 11:12
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A helper function that make's timed recursive calls, if a given condition does not pass, after a given amount of time in milliseconds. When the condition test pass, a callback function is called. For each recursive step call, there is a stepCallback if required.
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let global = { | |
stop: false | |
} | |
const timedCaller = (params) => { | |
params.debug && console.log('[DEBUG ' + params.name + '] fn call') | |
// Test condition, if true run the callback | |
if (params.condition.test()) { | |
params.debug && console.log('[DEBUG ' + params.name + '] condition test passed!') | |
if (typeof params.condition.callback === 'function') { | |
params.debug && console.log('[DEBUG ' + params.name + '] callback is fn, should call!') | |
return params.condition.callback() | |
} | |
} | |
// Keep trying as long it does not exceed max timeout | |
params.time.end = new Date().getTime() | |
params.time.totalMs = params.time.end - params.time.start | |
params.debug && console.log('[DEBUG ' + params.name + '] update params.time: ', params.time) | |
if (params.time.totalMs < params.time.maxMs) { | |
params.debug && console.log('[DEBUG ' + params.name + '] did not exceed total timeout') | |
params.timeout = setTimeout(() => { | |
clearTimeout(params.timeout) | |
if (typeof params.stepCallback === 'function') { | |
params.debug && console.log('[DEBUG ' + params.name + '] has a stepCallback and should call') | |
params.setCallback() | |
} | |
params.debug && console.log('[DEBUG ' + params.name + '] should recall / recursive') | |
timedCaller(params) | |
}, params.time.retryAfterMs) | |
} else { | |
params.debug && console.log('[DEBUG ' + params.name + '] timeout exceeded') | |
if (typeof params.time.exceedMaxTimeCallback === 'function') { | |
params.debug && console.log('[DEBUG ' + params.name + '] has exceedMaxTimeCallback and should call') | |
params.time.exceedMaxTimeCallback() | |
} | |
} | |
} | |
timedCaller({ | |
name: 'fnFoobar', | |
time: { | |
start: new Date().getTime(), | |
end: 0, | |
totalMs: 0, | |
maxMs:10000, | |
retryAfterMs: 1000, | |
exceedMaxTimeCallback: () => { | |
console.log('The caller exceedMaxTimeout!') | |
} | |
}, | |
condition: { | |
test: () => (global && global.stop), | |
callback: () => { | |
console.log('Hello world!') | |
} | |
}, | |
debug: true | |
}) | |
console.log('global.stop: ', global.stop) | |
setTimeout(() => { | |
global.stop = true | |
console.log('global.stop: ', global.stop) | |
}, 5000) |
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