gmime

go-gmime

This project is a binding of the C-based GMime library for Golang.

Dependencies

• Go v. 1.2+
• GMime v. 2.6.19 or later, built with glib 2.38.0 or later.

Usage

Just add library with:

go get github.com/sendgrid/go-gmime

or using your favorite dependency manager (for example godep or gom)

Setup for development

For OSX

# install required packages
brew install go
brew install gmime
bin/install_deps

On Ubuntu/Debian (trusty or jessie/sid, or later):

# install go and required packages
sudo apt-get install golang libgmime-2.6-dev

Earlier Ubuntu like 12.04 (precise) require to backport glib2 (version 2.38.1 or later) and gmime-2.6 (2.6.19 or later) Follow instructions in doc/packages.md for details.

bin/install_dep also put symlink to package dir, so cloned dir accessable for import by full-qualified name github.com/sendgrid/go-gmime/gmime

Compose Message

composer := NewComposer()
composer.AddFrom("Good Sender <good_sender@example.com>")
composer.AddTo("good_customer@example.com", "Good Customer")

// read data from a file:
fileHandler, _ := os.Open("data.txt")
defer fileHandler.Close()
reader := bufio.NewReader(fileHandler)

composer.AddHTML(reader)
print(composer.GetMessage())

Parse Message

// Example on how to create a NewParse

fileHandler, _ := os.Open("fixtures/text_attachment.eml")
defer fileHandler.Close()
reader := bufio.NewReader(fileHandler)
parse := NewParse(reader)

fmt.Println(parse.From())
fmt.Println(parse.To())
fmt.Println(parse.Subject())

// Output:
// Dave McGuire <david.mcguire@sendgrid.com>
// Team R&D <team-rd@sendgrid.com>
// Distilled Content-Type headers (outbound & failed)

Documentation

Use [https://developer.gnome.org/gmime/stable/|GMime Reference Manual] as documentation, this library have all classes/methods named very similiar with original GMime classes.

All objects will be unreferenced (in terms of glib/gmime) when go-gmime provided wrappers will be collected by go runtime.

Testing / Coverage

# run all tests on host machine
bin/test

# run all tests on Vagrant CentOS VM
bin/testvm

# run a specific test:
bin/test TestSimpleMessage
	
# generate tests coverage
bin/cover

Vagrant VMs

We use Ubuntu to run Valgrind and CentOS to match SendGrid production

# setup the Vagrant vm box and access it:
vagrant up go-gmime-centos
vagrant up go-gmime-ubuntu

# access a VM box
vagrant ssh go-gmime-centos
vagrant ssh go-gmime-ubuntu

# run test on VM
bin/testvm

Benchmarks

Create and copy test emails to the data/ directory at the root of this project.

# benchmark using GMime binding
go run bench/gmime/test.go

# benchmark using native Go
go run bench/native/test.go

# benchmark using Perl
perl bench/perl/test.pl

# run integration GMime binding benchmark
bin/bench

Memory Check

We use Valgrind with go-gmime-ubuntu VM to check for memory leak. Run the command below inside the VM and check valgrind.log

bin/valgrind	

(it require valgrind 3.9.x, 3.10.x is better, and gcc-go at least 4.9)

Contributing

# Don't forget to run gofmt before commiting
bin/fmt

License

go-gmime is licensed under the terms of the MIT license reproduced below. This means that go-gmime is free software and can be used for both academic and commercial purposes at absolutely no cost.