Go Revel Gooo..

dovchar 2014

✦ 8 years in IT

✦ 4 years in SoftServe

✦ 1.6 years Application Architect

✦Main language: Javascript

✦ Hobby language: Go

✦ Pacemaker conference

✦ Script’n’Code meet-up

✦Open source (typescript grails, clio

go, sonar qunit, kojak, jspro)

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About

me

✦ I love my project :)

✦ Technology stack / toolset

✦ Cloud Infrastructure

✦Monitoring

✦ Choose another lang/framework

✦GO lang

✦ Performance/Memory/Concurrency

✦ Revel

✦Questions

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Agenda

✦Medical Start-up

✦ Connects Patients and Providers

✦ 5 people

✦ 9 months development (super part time :)

✦ Budget: 235$

✦ SaaS

✦ Public cloud

✦ Single page application (SPA)

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About

Pro

ject

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Tech S

tack

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Clo

ud

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Monitoring

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Node.js you were my favorite toy…

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Bra

insto

rmin

g

Go lang

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«Go, also commonly referred to as golang, is a programming language initially

developed at Google in 2007 by Robert Griesemer, Rob Pike, and Ken Thompson.

It is a statically-typed language with syntax loosely derived from that of C, adding

garbage collection, type safety, some dynamic-typing capabilities, additional built-

in types such as variable-length arrays and key-value maps, and a large standard

library.»

Wikipedia

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Perf

orm

ance

You can find benchmarks comparing Go to a bunch

of other languages at the Computer Language

Benchmarks Game site

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Mem

ory

Go doesn't have a virtual machine

or interpreter to load up, so it

starts fast and small. Right now,

our production servers are running

at ~400 MB. A few months in,

we've never had a memory leak or

problems related to memory.

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Concurrency is a huge part of Go with some high

level constructs that make it a breeze to use. Go has

goroutines for concurrent operations and channels

for communicating between them.

Concurr

ency

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Reliability in a language is kind of hard to quantify.

We had a problem only with go-socket.io package.

Relia

bili

ty

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Go compiles into a

single, static binary

file so deployment is

simply putting the file

on a server and

starting it up. No

dependencies

required. No runtime

required (you don't

need to install Go on

the server). And it's

small.

Deplo

ym

ent

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Tech S

tack

Revel

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Revel enables you to get going really quickly, it has nice

defaults put in place that enable rapid development, and

high productivity; as advertised on the project page. Is

known for its flexibility in live environment, like code

reloading and such.

What is Revel?

Featu

res

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✦ Hot Code Reload: Edit, save, and refresh. Revel compiles your code and templates for you, so you don't miss a beat.

✦ Comprehensive: Revel provides routing, parameter parsing, validation, session/flash, templating, caching, job running, a testing framework, and even internationalization.

✦ High Performance: Revel builds on top of the Go HTTP server, which was recently benchmarked to serve three to ten times as many requests as Rails across a variety of loads.

✦ Synchronous: The Go HTTP server runs each request in its own goroutine. Write simple callback-free code without guilt.

✦ Stateless: Revel provides primitives that keep the web tier stateless for predictable scaling. For example, session data is stored in the user cookie, and the cache is backed by a memcached cluster.

✦ Modular: Revel is built around composable middleware called filters, which implement nearly all request-processing functionality. Developers have the freedom to replace the default filters with custom implementations (e.g. a custom router).

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Get S

tart

ed

install go

set up your GOPATH and GOROOT

install git and hg

get Revel

Build the Revel command line tool

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Get S

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Get S

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Get S

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Get S

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Ne

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Ne

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Ro

ute

r

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Co

ntr

olle

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Se

rvic

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Mo

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l

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Init

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So

cke

t.io

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Ha

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ler

Conclu

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n

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Lin

ks

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✦ node.js

✦ sonarqube

✦ grunt, bower, yeoman, gulp

✦ pacemaker, script’n’code

✦ sails.js, revel

✦mongo, mgo

✦ newrelic, digitalocean, aws

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Questions?

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