Go configuration with fangs!

Many Go projects are built using Viper including:

• Hugo
• EMC RexRay
• Imgur’s Incus
• Nanobox/Nanopack
• Docker Notary
• BloomApi
• doctl
• Clairctl
• Mercure

Install

go get github.com/spf13/viper

What is Viper?

Viper is a complete configuration solution for Go applications including 12-Factor apps. It is designed to work within an application, and can handle all types of configuration needs and formats. It supports:

• setting defaults
• reading from JSON, TOML, YAML, HCL, envfile and Java properties config files
• live watching and re-reading of config files (optional)
• reading from environment variables
• reading from remote config systems (etcd or Consul), and watching changes
• reading from command line flags
• reading from buffer
• setting explicit values

Viper can be thought of as a registry for all of your applications configuration needs.

Why Viper?

When building a modern application, you don’t want to worry about configuration file formats; you want to focus on building…

Gin Web Framework

Gin is a web framework written in Go (Golang). It features a martini-like API with performance that is up to 40 times faster thanks to httprouter. If you need performance and good productivity, you will love Gin.

Contents

• Gin Web Framework
  • Contents
  • Installation
  • Quick start
  • Benchmarks
  • Gin v1. stable
  • Build with jsoniter
  • API Examples
    • Using GET, POST, PUT, PATCH, DELETE and OPTIONS
    • Parameters in path
    • Querystring parameters
    • Multipart/Urlencoded Form
    • Another example: query + post form
    • Map as querystring or postform parameters
    • Upload files
      • Single file
      • Multiple files
    • Grouping routes
    • Blank Gin without middleware by default
    • Using middleware
    • How to write log file
    • Custom Log Format
    • Controlling Log output coloring
    • Model binding and validation
    • Custom Validators
    • Only Bind Query String
    • Bind Query String or Post Data
    • Bind Uri
    • Bind Header
    • Bind HTML checkboxes
    • Multipart/Urlencoded binding
    • XML, JSON, YAML and ProtoBuf rendering
      • SecureJSON
      • JSONP
      • AsciiJSON
      • PureJSON
    • Serving static…

The MongoDB driver for Go

This fork has had a few improvements by ourselves as well as several PR's merged from the original mgo repo that are currently awaiting review Changes are mostly geared towards performance improvements and bug fixes, though a few new features have been added.

Further PR's (with tests) are welcome, but please maintain backwards compatibility.

Detailed documentation of the API is available at GoDoc.

A sub-package that implements the BSON specification is also included, and may be used independently of the driver.

Supported Versions

mgo is known to work well on (and has integration tests against) MongoDB v3.0, 3.2, 3.4 and 3.6.

MongoDB 4.0 is currently experimental - we would happily accept PRs to help improve support!

Changes

• Fixes attempting to authenticate before every query (details)
• Removes bulk update / delete batch size limitations (details)
• Adds native support for time.Duration marshalling…

⚡ zap

Blazing fast, structured, leveled logging in Go.

Installation

go get -u go.uber.org/zap

Note that zap only supports the two most recent minor versions of Go.

Quick Start

In contexts where performance is nice, but not critical, use the SugaredLogger. It's 4-10x faster than other structured logging packages and includes both structured and printf-style APIs.

logger, _ := zap.NewProduction()
defer logger.Sync() // flushes buffer, if any
sugar := logger.Sugar()
sugar.Infow("failed to fetch URL"
  // Structured context as loosely typed key-value pairs.
  "url", url
  "attempt", 3
  "backoff", time.Second,
)
sugar.Infof("Failed to fetch URL: %s", url)

When performance and type safety are critical, use the Logger. It's even faster than the SugaredLogger and allocates far less, but it only…

UUID

Package uuid provides a pure Go implementation of Universally Unique Identifiers (UUID) variant as defined in RFC-4122. This package supports both the creation and parsing of UUIDs in different formats.

This package supports the following UUID versions:

• Version 1, based on timestamp and MAC address (RFC-4122)
• Version 2, based on timestamp, MAC address and POSIX UID/GID (DCE 1.1)
• Version 3, based on MD5 hashing of a named value (RFC-4122)
• Version 4, based on random numbers (RFC-4122)
• Version 5, based on SHA-1 hashing of a named value (RFC-4122)

Project History

This project was originally forked from the github.com/satori/go.uuid repository after it appeared to be no longer maintained, while exhibiting critical flaws. We have decided to take over this project to ensure it receives regular maintenance for the benefit of the larger Go community.

We'd like to thank Maxim Bublis for his hard work on the original iteration of the…

jwt-go

A go (or 'golang' for search engine friendliness) implementation of JSON Web Tokens

NEW VERSION COMING: There have been a lot of improvements suggested since the version 3.0.0 released in 2016. I'm working now on cutting two different releases: 3.2.0 will contain any non-breaking changes or enhancements. 4.0.0 will follow shortly which will include breaking changes. See the 4.0.0 milestone to get an idea of what's coming. If you have other ideas, or would like to participate in 4.0.0, now's the time. If you depend on this library and don't want to be interrupted, I recommend you use your dependency mangement tool to pin to version 3.

SECURITY NOTICE: Some older versions of Go have a security issue in the cryotp/elliptic. Recommendation is to upgrade to at least 1.8.3. See issue #216 for more detail.

SECURITY NOTICE: It's important that you validate the alg presented is what you expect…

Testify - Thou Shalt Write Tests

ℹ️ We are working on testify v2 and would love to hear what you'd like to see in it, have your say here: https://cutt.ly/testify

Go code (golang) set of packages that provide many tools for testifying that your code will behave as you intend.

Features include:

• Easy assertions
• Mocking
• Testing suite interfaces and functions

Get started:

• Install testify with one line of code, or update it with another
• For an introduction to writing test code in Go, see http://golang.org/doc/code.html#Testing
• Check out the API Documentation http://godoc.org/github.com/stretchr/testify
• To make your testing life easier, check out our other project, gorc
• A little about Test-Driven Development (TDD)

assert package

The assert package provides some helpful methods that allow you to write better test code in Go.

• Prints friendly, easy to read failure descriptions
• Allows for very readable code
• Optionally annotate each assertion with a message

See it…

YAML support for the Go language

Introduction

The yaml package enables Go programs to comfortably encode and decode YAML values. It was developed within Canonical as part of the juju project, and is based on a pure Go port of the well-known libyaml C library to parse and generate YAML data quickly and reliably.

Compatibility

The yaml package supports most of YAML 1.1 and 1.2, including support for anchors, tags, map merging, etc. Multi-document unmarshalling is not yet implemented, and base-60 floats from YAML 1.1 are purposefully not supported since they're a poor design and are gone in YAML 1.2.

Installation and usage

The import path for the package is gopkg.in/yaml.v2.

To install it, run:

go get gopkg.in/yaml.v2

API documentation

If opened in a browser, the import path itself leads to the API documentation:

• https://gopkg.in/yaml.v2

API stability

The package API for yaml v2 will remain stable as described in…

gomock

GoMock is a mocking framework for the Go programming language. It integrates well with Go's built-in testing package, but can be used in other contexts too.

Installation

Once you have installed Go, install the mockgen tool.

To get the latest released version use:

GO111MODULE=on go get github.com/golang/mock/mockgen@v1.4.3

If you use mockgen in your CI pipeline, it may be more appropriate to fixate on a specific mockgen version.

Documentation

After installing, you can use go doc to get documentation:

go doc github.com/golang/mock/gomock

Alternatively, there is an online reference for the package hosted on GoPkgDoc here.

Running mockgen

mockgen has two modes of operation: source and reflect Source mode generates mock interfaces from a source file It is enabled by using the -source flag. Other flags that may be useful in this mode are -imports and -aux_files.

Example:

mockgen -source=foo.go [other options]

Reflect mode generates mock interfaces by…

Modd is a developer tool that triggers commands and manages daemons in response to filesystem changes.

If you use modd, you should also look at devd, a compact HTTP daemon for developers Devd integrates with modd, allowing you to trigger in-browser livereload with modd.

The repo contains a set of example modd.conf files that you can look at for a quick idea of what modd can do:

Install

Modd is a single binary with no external dependencies, released for OSX Windows, Linux, FreeBSD, NetBSD and OpenBSD. Go to the releases page, download the package for your OS, and copy the binary to somewhere on your PATH.

If you have a working Go installation, you…