Golang skills session1: introduction

Golang Skills Training
Sofiane Imadali, Ayoub Bousselmi
Session 1: generalities and methodology
16/04/2019 Golang Skills 1

Agenda
 Goals
 General introduction
 Origins and evolution
 Main characteristics, Context and Why a new language
 Journey from Python to Go (with code snippets)
 A first code dive: the Prometheus case
 Methodology
 Define steps for training (see ToC of tour & Trello)
 Long-term project proposal
 Tools (tour, github/gitlab (?), wekan …)

Goals

Goals
 Understand the basics of the language and be
autonomous to read, modify and create go code
 Dive into a long term collaborative project to
develop something meaningful in go
 Start creating and integrating Prometheus
exporters in go

General introduction

Origins and evolution
First appeared
 November 10, 2009; 9 years ago
Designed by
 Robert Griesemer: known for his work at the Java HotSpot Virtual
Machine
 Rob Pike: member of the Unix team at Bell Labs, worked at the Plan 9
and Inferno operating systems and the Limbo programming language
 Ken Thompson: (member of the Unix team at Bell Labs, one of the
fathers of C, Unix and Plan 9 operating systems, co-developed UTF-8
with Rob Pike
Stable release
 1.12.4 / April 11th, 2019;

Origins and evolution
Go: TIOBE’s Programming Language of 2016

Main characteristics, Context and Why a new language
• Go is a language designed from the ground up, as a ‘C for the 21st
century’.
• C-family: C++, Java and C#
• Concurrency mechanism: inspired by Tony Hoare’s CSP (Communicating
Sequential Processes) theory as used by the Erlang language.
• Completely open-source language, distributed with a BSD license, so it can
be used by everybody even for commercial purposes without a fee
• Resemblance with the C-syntax, more concise and clean.
• It also has characteristics of a dynamic language, so Python and Ruby
programmers feel more comfortable with it.

Main characteristics, Context and Why a new language
• C/C++ did not evolve with the computing landscape: so there is a definite
need for a new systems language, appropriate for needs of our computing
era
• In contrast to computing power, software development is not considerably
faster or more successful (considering the number of failed projects) and
applications still grow in size, so a new low-level language, but equipped with
higher concepts, is needed
• Before Go a developer had to choose between fast execution but slow and
not efficient building (like C++), efficient compilation (but not so fast
execution, like .NET or Java), or ease of programming (but slower execution,
like the dynamic languages): Go is an attempt to combine all three wishes:
efficient and thus fast compilation, fast execution, ease of programming

When you
propose to
develop
in Go…

Journey
from
Python to
Go
Comparing
programming
languages is like
comparing
sport cars…

Journey from Python to Go
Python Go
#1 Paradigm
Object oriented
Imperative
Functional
Procedural
Reflective
Procedural
Functional
Concurrent

Python Go
#2 Execution
Interpreted
(compiled to bytecode)
Garbage collected
Compiled
(statically linked,
dynamically linked)
Garbage collected

Python Go
#3 Type system
Dynamically typed Statically typed

Python Go
#4 Syntax
Indentation { opening and closing }
braces

Python Go
#5 Concurrency
Take time to implement
Extra effort to use all
the available processing
power
simple
built-in

Python Go
#6 Dependencies Management
pip install
requirements.txt
go get
go mod
vendor
Others (glide, GoPkg)

When you
have
choose…

Python Ruby Node.js C/C++ Java Go
Semicolons N N Y Y Y N*
Curly braces N N* Y Y Y Y
Static types N N N Y Y Y
Concurrency -
simplicity
N N Y N N Y
Concurrency –
multi-core
N N N Y Y Y
Compiled N N N Y Y Y
OO: classes,
inheritance, etc.
Y Y Y Y Y N*

A first code dive:
the Prometheus case

Methodology

Project
Training
Methodology

Methodology
It’s about finding the balance between training, a project,
and not being bored or lost

Training
 Generalities (today)
 Environment
 Installation, IDE, Books, and more
 The language
 Basics
 Methods, Interfaces
 Concurrency
 Idiomatic go and common errors
 Production ready code
 Project structure
 Unitests, Code coverage, and CI/CD
 Versioning your code

Project
 Definition (today)
 Scrum
 Tasks and goals
 Tools to use
 Contributions in parallel with the training
 Code review and releases
 Proposal: a basic Prometheus exporter
 Using a metrics generator/collector library
 Export them to Prometheus
 Make a CLI for the tool
 Make a dashboard or API (?)

 Source code
 Project, code, and review
 Tour and playground
 For the training, learning, and testing
 Project tasks
 Scrum-like, collaboration
Tools
 Github + Travis
 Gitlab + Gitlab-CI
 Wekan
 Trello

Thanks
sofiane.imadali@orange.com
ayoub.bousselmi@orange.com

Golang skills session1: introduction

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