Beefcake

A pure-Ruby Google Protocol Buffers library. It's all about being Buf; ProtoBuf.

Installation

gem install beefcake

Usage

require 'beefcake'

class Variety
  include Beefcake::Message

  # Required
  required :x, :int32, 1
  required :y, :int32, 2

  # Optional
  optional :tag, :string, 3

  # Repeated
  repeated :ary,  :fixed64, 4
  repeated :pary, :fixed64, 5, :packed => true

  # Enums - Simply use a Module (NOTE: defaults are optional)
  module Foonum
    A = 1
    B = 2
  end

  # As per the spec, defaults are only set at the end
  # of decoding a message, not on object creation.
  optional :foo, Foonum, 6, :default => Foonum::B
end

# You can create a new message with hash arguments:
x = Variety.new(:x => 1, :y => 2)

# You can set fields individually using accessor methods:
x = Variety.new
x.x = 1
x.y = 2

# And you can access fields using Hash syntax:
x[:x] # => 1
x[:y] = 4
x # => <Variety x: 1, y: 4>

Encoding

Any object responding to << can accept encoding

# see code example above for the definition of Variety
x = Variety.new(:x => 1, :y => 2)

# For example, you can encode into a String:
s = ""
x.encode(s)
s # => "\b\x01\x10\x02)\0"

# If you don't encode into anything, a new Beefcake::Buffer will be returned:
x.encode # => #<Beefcake::Buffer:0x007fbfe1867ab0 @buf="\b\x01\x10\x02)\0">

# And that buffer can be converted to a String:
x.encode.to_s # => "\b\x01\x10\x02)\0"

Decoding

# see code example above for the definition of Variety
x = Variety.new(:x => 1, :y => 2)

# You can decode from a Beefcake::Buffer
encoded = x.encode
Variety.decode(encoded) # => <Variety x: 1, y: 2, pary: [], foo: B(2)>

# Decoding from a String works the same way:
Variety.decode(encoded.to_s) # => <Variety x: 1, y: 2, pary: [], foo: B(2)>

# You can update a Beefcake::Message instance with new data too:
new_data = Variety.new(x: 12345, y: 2).encode
Variety.decoded(new_data, x)
x # => <Variety x: 12345, y: 2, pary: [], foo: B(2)>

Generate code from `.proto` file

protoc --beefcake_out output/path -I path/to/proto/files/dir path/to/file.proto

You can set the BEEFCAKE_NAMESPACE variable to generate the classes under a desired namespace. (i.e. App::Foo::Bar)

About

Ruby deserves and needs first-class ProtoBuf support. Other libs didn't feel very "Ruby" to me and were hard to parse.

This library was built with EventMachine in mind. Not just blocking-IO.

Source: https://github.com/protobuf-ruby/beefcake

Support Features

Optional fields
Required fields
Repeated fields
Packed Repeated Fields
Varint fields
32-bit fields
64-bit fields
Length-delimited fields
Embedded Messages
Unknown fields are ignored (as per spec)
Enums
Defaults (i.e. optional :foo, :string, :default => "bar")
Varint-encoded length-delimited message streams

Future

Imports
Use package in generation
Groups (would be nice for accessing older protos)

Testing

rake test

Beefcake conducts continuous integration on Travis CI. The current build status for HEAD is .

All pull requests automatically trigger a build request. Please ensure that tests succeed.

Currently Beefcake is tested and working on:

Ruby 1.9.3
Ruby 2.0.0
Ruby 2.1.0
Ruby 2.1.1
Ruby 2.1.2
JRuby in 1.9 mode

Thank You

Keith Rarick (kr) for help with encoding/decoding.
Aman Gupta (tmm1) for help with cross VM support and performance enhancements.

protobuf-ruby/beefcake