Commit16776e3

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Create Rate Limiter.js

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	`1`	`+function*generator(){`
	`2`	`+varrate=5;`
	`3`	`+varper=8;`
	`4`	`+varlastTime=Date.now();`
	`5`	`+varallowance=rate;// unit: messages`
	`6`	`+`
	`7`	`+while(true){`
	`8`	`+varcurrentTime=Date.now();`
	`9`	`+vartimeElapsed=(currentTime-lastTime)/1000;`
	`10`	`+varlastTime=currentTime;`
	`11`	`+varaddedTime=timeElapsed*(rate/per);`
	`12`	`+`
	`13`	`+allowance+=addedTime;`
	`14`	`+`
	`15`	`+`
	`16`	`+console.log('allowance',allowance,addedTime);`
	`17`	`+if(allowance>rate){`
	`18`	`+allowance=rate;`
	`19`	`+}`
	`20`	`+`
	`21`	`+if(allowance<1.0){`
	`22`	`+yieldfalse;`
	`23`	`+}else{`
	`24`	`+allowance-=1.0;`
	`25`	`+yieldtrue;`
	`26`	`+}`
	`27`	`+}`
	`28`	`+}`

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