A complete example of a REST-ful API server in written in Go (golang).

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Features

• Simple, flexible and testable architecture
  • Light-weight server component
  • Easy to replace components with your own library of choice (router, database driver, etc)
  • Guaranteed thread-safety for each request: uses gorilla/context for per-request context
  • Uses dependency-inversion principle (DI) to reduce complexity and manage package dependencies.
• Not a framework
  • More like a project to quickly kick-start your own REST API server, customized to your own needs.
  • Easily extend the project with your own REST resources, in addition to the built-in users and sessions resources.
• Each REST resource is a separate package
  • Modular approach
  • Separation between model, controller and data layers
  • Clear abstraction from server package
  • Take a look at built-in resources for examples: users and sessions
  • More example projects coming soon!
• Batteries come included
  • API versioning using using Accept header, for e.g: Accept=application/json;version=1.0,*/*
  • Default resources for users and sessions
  • Access control using activity-based access control (ABAC)
  • Authentication and session management using JWT token
  • Context middleware using gorilla/context for per-request context
  • JSON response rendering using unrolled/render; extensible to XML or other formats for response
  • MongoDB middleware for database; extensible for other database drivers
• Highly-testable code base
  • Unit-tested server; 100% code coverage
  • Easily test REST resources routes
  • Parallelizable test suite
  • Uses ginkgo for test framework; optional.

Changelog

See CHANGELOG.md for changes

Quick start

To run an instance of a server example:

# get go-package and put it in your go-workspace
go get github.com/sogko/slumber

# go to package root folder
cd $GOPATH/src/github.com/sogko/slumber

# install dependencies
go get

# run Server
go run main.go

# http://localhost:3001

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Dependencies

• Golang v1.4+
• MongoDB
• External Go packages dependencies

# production
go get github.com/codegangsta/negroni   # HTTP server library
go get gopkg.in/tylerb/graceful.v1      # graceful server shutdown
go get github.com/gorilla/mux           # HTTP router
go get github.com/gorilla/context       # Per-request context registry utility
go get github.com/unrolled/render       # JSON response renderer
go get gopkg.in/mgo.v2                  # Golang MongoDB driver

# development / test
go get github.com/onsi/ginkgo           # Golang BDD test framework, complements `go test`
go get github.com/onsi/gomega           # Ginkgo's preferred matcher library
go get github.com/modocache/gory        # `factory_girl` for Go

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Test

Install all Go package dependencies and run either one of the following command

go test

# or

$GOPATH/bin/ginkgo -r --randomizeAllSpecs -p -nodes=4

# "-r" watches recursively (including test suites for sub-packages)
# "-p -nodes=4" parallelize test execution with 4 worker nodes

TDD

$GOPATH/bin/ginkgo watch -r -p -nodes=4

# "-r" watches recursively (including test suites for sub-packages)
# "-p -nodes=4" parallelize test execution with 4 worker nodes

Code coverage

Coveralls.io link: [https://coveralls.io/r/sogko/slumber]

To generate coverage profile

cd $GOPATH/src/github.com/sogko/slumber

# run test recursively and generate coverage data for each package
$GOPATH/bin/ginkgo -r -cover -p

# join coverage data for all packages into a single profile (for coveralls.io)
$GOPATH/bin/gover . slumber.coverprofile

To view coverage

go tool cover -html=$GOPATH/src/github.com/sogko/slumber/slumber.coverprofile

Sessions Management

To generate key pair for signing JWT claims

$ openssl genrsa -out demo.rsa 1024 # the 1024 is the size of the key we are generating
$ openssl rsa -in demo.rsa -pubout > demo.rsa.pub 

Architecture

<img src="http://i.imgur.com/HwIhPz7.png"/ height="750"/>

TODO

• Add open-source license (MIT)
• API versioning using Accept header, for e.g: Accept=application/json;version=1.0,*/*
• User and roles management
• Session management using JWT tokens
• Activity-based access control (ABAC)
• Refactor using Dependency Inversion
• Task scheduler
• Load test using vegeta
• i18n (internationalisation)
• Implement another router library for kicks
• Consolidate util libraries and publish as separate package
• Abstract away negroni middlewares to a generic http.HandlerFunc
• Create a REST API server project using this package as a boilerplate without changing this package
• User documentation (create resources routes, ACL, tests, middlewares etc)