server availability status uphold, auto dependency detection

npm i @open-node/ticker --save

const Ticker = require('@open-node/ticker');

const ticker = Ticker(['server1', 'server2', 'server3']);

// Upload server1 status with call checkServer1AsyncFn per 2 second
ticker.tock(checkServer1AsyncFn, 'server1', 2 * 1000);

cosnt server1Availability = ticker.status('server1'); // server1Availability is true or false

const fn1IfServer1Availability = ticker.runner(fn1, 'server1');

await fn1IfServer1Availability(); // fn1 be called when server1 is enabled unless fn1 will be wait, unit server1 is enabled

• Ticker
  • Parameters
  • status
    • Parameters
  • tock
    • Parameters
  • runner
    • Parameters

• _keys Array<string> Dependency server's names

Returns Ticker Instance

read/write status value

• key string server's unique key
• value boolean? server's status value

Returns boolean server's current status value

Dependency detection runner

• hitFn AsyncFunction detection function return true or false
• key string server‘s key
• sleepMS number two times called interval ms

Returns AsyncFunction detection runner be called by async.forever

For a function add dependency detection

• fn function Orig function, it will be add dependency detection
• key string dependency server's key
• sleepMS number dependency detection interval ms (optional, default 100)

Returns function 返回处理后的函数