Sina Saeidi xesina

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

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

What's an Effective Engineer?

Getting Started

Laravel Homestead is an official, pre-packaged Vagrant box that provides you a wonderful development environment without requiring you to install PHP, HHVM, a web server, and any other server software on your local machine. Read more...

Download

Download homestead box:

Loading Route Facelift

LoadingRoute has existed for a while, but it's barely useful and largely broken. It's never gotten much love due to it largely being a hangover of the router.js microlib, and we can make it better. The problems with LoadingRoute are intertwined with issues with facelift router's handling of async transitions in some cases, but of which need to be addressed, but here's a list of problems related to both:

There's only one global LoadingRoute that gets activated when

	CREATE OR REPLACE FUNCTION public.inseupcontacts(data json, img json)
	RETURNS SETOF jsonb
	LANGUAGE plpgsql
	AS $function$
	DECLARE
	ref refcursor;
	record contacts%ROWTYPE;
	I_Max integer := json_array_length(data)-1;
	uid integer;
	name character varying;

	package main

	import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"

	package main

	import (
	"fmt"
	"github.com/codegangsta/negroni"
	"github.com/gorilla/mux"
	"log"
	"net/http"
	)

	package main

	import (
	"net/http"
	"database/sql"
	"fmt"
	"log"
	"os"
	)

	import "bytes"

	func StreamToByte(stream io.Reader) []byte {
	buf := new(bytes.Buffer)
	buf.ReadFrom(stream)
	return buf.Bytes()
	}

	func StreamToString(stream io.Reader) string {
	buf := new(bytes.Buffer)

	Use TCPDUMP to Monitor HTTP Traffic
	1. To monitor HTTP traffic including request and response headers and message body:

	tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'

	2. To monitor HTTP traffic including request and response headers and message body from a particular source:

	tcpdump -A -s 0 'src example.com and tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'

	3. To monitor HTTP traffic including request and response headers and message body from local host to local host:

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD