Hari haran hariharan-uno

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Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

What's an Effective Engineer?

They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

	package main

	// @lizrice, mostly copied from @doctor_julz: https://gist.github.com/julz/c0017fa7a40de0543001

	import (
	"fmt"
	"os"
	"os/exec"
	"syscall"
	)

	package main

	import (
	"fmt"
	"os"
	"os/exec"
	"syscall"
	)

	func main() {

	package main

	import (
	"fmt"
	"strconv"

	"github.com/extemporalgenome/slug"
	)

	type person struct {

	package main

	import (
	"github.com/gorilla/websocket"
	"io"
	"log"
	"net/http"
	)

	func handler(w http.ResponseWriter, r *http.Request) {

	//Copied from https://groups.google.com/forum/#!msg/golang-nuts/dEfqPOSccIc/hoq8jdPTBIcJ

	package main

	import(
	"crypto/rand"
	"crypto/tls"
	"io/ioutil"
	"log"
	"net"

	HOSTIP=`netstat -rn \| grep "^0.0.0.0 " \| cut -d " " -f10`
	/home/vagrant/recond -marksman=http://$HOSTIP:3000 -nats=tcp://$HOSTIP:4222 &
	echo "recond started..."

	#include <sys/wait.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <string.h>
	int
	main(int argc, char *argv[])
	{
	int pipefd[2];
	pid_t cpid;