Golang for PHP programmers: A practical introduction

Golang for PHP
developers
A practical introduction

 
by Richard Tuin

Who am I?
• @Richard_Tuin

• Doing mostly PHP

• Last 5 years at Enrise

• First day @ Egeniq!

• PHPBenelux

• Creator of Camilla Proxy

About the presentation
WHAT IS
GOLANG
GOLANG  
USE CASE
GETTING
STARTED

What is Golang?
• Origin of Golang

• Hello World example

• Language features

What problems
does it solve?
The origin of Golang

Hello World example
package main
import "fmt"
func main () {
world := "DPC 2017"
fmt.Println("Hello", world)
// Hello DPC 2017
}

Application lifecycles 
(simpliﬁed)
What makes Golang
Load ﬁle(s)
Compiles
Execute

PHP application lifecycle
What makes Golang
Load ﬁle(s)
Compiles
Execute
Request
Response

Go application lifecycle
What makes Golang
Load ﬁle(s)
Compiles
Execute
Request Response
Compilation into binary

• Stuﬀ that mostly equal to other languages

• Scalar types (string, int, bool)

• Too complex types (slices)
Not going over…
Language features

Types: Maps
Language features
daysMap := make(map[string]int)
daysMap["April"] = 30
daysMap["May"] = 31
daysMap["May"] // 31
fmt.Println(daysMap)
// map[April:30 May:31]

Types: Structures
Language features
type Message struct {
Category string
Content string
}
msg := Message{
Category: "Greeting",
Content: "Hello DPC!",
}
msg.Content // Hello DPC!

Types: Structures 2
Language features
type Cow struct {}
func (c Cow) Greet() string {
return "Moo"
}
c := Cow{}
c.Greet()
// Cow says: Moo

Types: Structures 3
Language features
type Duck struct {}
func (d Duck) Greet() string {
return "Quack"
}

Types: Interfaces
Language features
type Greeter interface {
Greet() string
}
type Cow struct {} // Greet()
type Duck struct {} // Greet()
type Tree struct {} // Doesn’t Greet()

Types: Interfaces 2
Language features
func SayHello(g Greeter) {
fmt.Println("Greeter says:", g.Greet())
}
SayHello(c) // Greeter says: Moo
SayHello(d) // Greeter says: Quack
SayHello(t) // Compiler error
c := Cow{}
d := Duck{}
t := Tree{}

Types: Interfaces 3
Language features
./file.go:67:
cannot use t (type Tree) as type Greeter
in argument to SayHello:
Tree does not implement Greeter
(missing Greet method)

Go-routines
Language features
func WaitShort() {
time.Sleep(500 * time.Millisecond)
}
func WaitLong() {
time.Sleep(1000 * time.Millisecond)
}

Go-routines 2
Language features
WaitLong()
WaitShort()
WaitLong()
Time
WaitShort()

Go-routines 3
Language features
go WaitLong()
WaitShort()
WaitLong()
Time
WaitShort()

Channels
Language features
messages := make(chan string)
Example from: https://gobyexample.com/channels
go func() { messages <- "ping" }()
incoming := <-messages
fmt.Println(incoming)

• HTTP Proxy

• Web Interface

• to inspect server-to-server communication

• Built to run on production
What is Camilla Proxy?
Golang use case

What is Camilla Proxy?
Golang use case

How does it work?
Golang use case
YOUR APP GITHUB API
HTTP

How does it work?
Golang use case
YOUR APP GITHUB API
CAMILLA PROXY
WEB INTERFACE
PROXY
CLIENTCLIENT CLIENT

Concurrency in Camilla Proxy
Golang use case
YOUR APP GITHUB API
CAMILLA PROXY
WEB INTERFACE
PROXY
CLIENTCLIENT CLIENT

Go! Getting started
• Your Go environment

• Running your ﬁrst program

• Using external packages

• Go programmer’s toolbox

Your Go environment
Go! Getting started
Extract Go package into /usr/local/go — or — C:GoSTEP 1
Create the directory ~/go. This is your workspaceSTEP 2

Running your ﬁrst program
Go! Getting started
// file: ~/go/src/hello/hello.go
package main
import "fmt"
func main () {
world := "DPC 2017"
fmt.Println("Hello", world)
}

Running your ﬁrst program
Go! Getting started
> cd ~/go/src/hello
> go run hello.go
Hello DPC 2017

Building your ﬁrst program
Go! Getting started
> cd ~/go/src/hello
> go build
> ./hello
Hello DPC 2017

Using external packages
Go! Getting started
> go get [package name]
> go get github.com/sirupsen/logrus
This will download the package into:
~/go/src/github.com/sirupsen/logrus

Using external packages
Go! Getting started
package main
import "github.com/sirupsen/logrus"
func main() {
logrus.Info("Log using logrus")
}

• Editors and IDE’s

• Composer for Golang

• Testing Golang applications
Go programmer’s toolbox
Go! Getting started

Editors and IDE’s
IDE’sEditors
•Sublime Text
•Atom
•vIM
•…
• Gogland (Jetbrains)
• PHPstorm w/ Go plugin
• VS Code

Composer for Golang
G l i de

Testing
Go! Getting started
// file: ~/go/src/hello/hello_test.go
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestTwoVariables(t *testing.T) {
assert.NotEqual(t, 1, 2)
}
> go test
PASS
ok hello 0.010s

I hope you are now
excited about Go!

Get in touch
• @Richard_Tuin

• me@rtuin.nl

• rtuin @ phpnl Slack

Golang for PHP programmers: A practical introduction

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