FFI YAJL

ffi-yajl is a Ruby adapter for the yajl JSON parser/generator library. ffi-yajl supports multiple Ruby C extension mechanisms, including both MRI native extensions and FFI in order to be compatible with as many Ruby implementations as possible while providing good performance where possible.

Basic Usage

require 'ffi-yajl'
json_out = FFI_Yajl::Encoder.encode( { "foo" => [ "bar", "baz" ] } )
# => "{\"foo\":[\"bar\",\"baz\"]}"
data_in = FFI_Yajl::Parser.parse( json_out )
# => {"foo"=>["bar", "baz"]}

Why This Instead of X?

yajl is the only JSON library we've found that has error messages that meet our requirements. The stdlib json gem and oj (at the time we started this project) have error messages like "invalid token at byte 1234," which are probably fine for server use, but in chef we frequently deal with user-written JSON documents, which means we need a good user experience when encountering malformed JSON.

We previously used brianmario's yajl-ruby project, but we wanted to be able to fallback to using FFI bindings to the C code (so we could support non-MRI rubies) and we also needed some bug fixes in yajl2, but the maintainer wasn't able to devote enough time to the project to make these updates in a timeframe that worked for us.

Thanks

This was initially going to be a clean rewrite of an ffi ruby wrapper around yajl2, but as it progressed more and more code was pulled in from brianmario's existing yajl-ruby gem, particularly all the c extension code, lots of specs and the benchmarks. And the process of writing this would have been much more difficult without being able to draw heavily from already solved problems in yajl-ruby.

License

Given that this draws heavily from the yajl-ruby sources, and could be considered a derivative work, the MIT License from that project has been preserved and this source code has deliberately not been dual licensed under Chef's typical Apache License. See the LICENSE file in this project.