Use omq-rs for the Rust backend

Gemfile

@@ -18,6 +18,7 @@ gem "nuckle",        path: ENV["OMQ_DEV"] ? "../nuckle" : nil
 gem "protocol-zmtp", path: "gems/protocol-zmtp"
 
 gem "omq-backend-rust",   require: false, path: "gems/omq-backend-rust"
+gem "omq-rs",             require: false, path: ENV["OMQ_RS_PATH"]
 gem "omq-qos",            require: false, path: "gems/omq-qos"
 gem "omq-websocket",      require: false, path: "gems/omq-websocket"
 

README.md

@@ -226,8 +226,8 @@ See the [omq-cli README](https://github.com/paddor/omq-cli) for full documentati
 
 ## Optional Rust backend
 
-Install `omq-backend-rust` for a Rust/omq-tokio backend. Same socket API,
-but connection handling runs in native code on a Tokio runtime.
+Install `omq-backend-rust` for an OMQ.rs backend through the first-class
+`omq-rs` binding. Same socket API, with connection handling on a Tokio runtime.
 
 The Rust backend also supports TruffleRuby. The pure Ruby backend currently
 requires MRI-style native `Fiber.scheduler` support, so use `backend: :rust`

gems/omq-backend-rust/CHANGELOG.md

@@ -7,6 +7,11 @@
 - Added JRuby support through OMQ.java Maven artifacts for Linux x86_64,
   macOS aarch64, macOS x86_64, and Windows x86_64.
 
+### Changed
+
+- Replaced the private MRI/TruffleRuby native extension with the first-class
+  `omq-rs` binding.
+
 ## [0.2.0] - 2026-08-08
 
 ### Added

gems/omq-backend-rust/Gemfile

@@ -12,9 +12,9 @@ ROOT     = File.expand_path("../..", __dir__)
 SIBLINGS = File.expand_path("../../..", __dir__)
 
 gem "omq",           path: ROOT
+gem "omq-rs",        path: ENV["OMQ_RS_PATH"]
 gem "protocol-zmtp", path: File.join(ROOT, "gems/protocol-zmtp")
 gem "nuckle",        path: ENV["OMQ_DEV"] ? File.join(SIBLINGS, "nuckle") : nil
 
 gem "minitest"
 gem "rake"
-gem "rake-compiler" unless RUBY_ENGINE == "jruby"

gems/omq-backend-rust/README.md

@@ -6,16 +6,16 @@
 [![Ruby](https://img.shields.io/badge/Ruby-%3E%3D%203.3-CC342D?logo=ruby&logoColor=white)](https://www.ruby-lang.org)
 
 Rust-backed engine for [OMQ](https://github.com/zeromq/omq.rb). Same socket API,
-but networking runs on a [Tokio](https://tokio.rs/) runtime inside a native
-extension compiled via [rb_sys](https://github.com/oxidize-rb/rb-sys) on MRI
-and TruffleRuby, or through OMQ.java on JRuby.
+but networking runs through the first-class
+[omq-rs](https://github.com/paddor/omq.rs/tree/main/bindings/ruby) binding on
+MRI and TruffleRuby, or through OMQ.java on JRuby.
 
 ## Install
 
-Requires a Rust toolchain (stable) at gem install time on MRI and
-TruffleRuby. JRuby uses OMQ.java on Java 25 or newer. The Java gem selects
-the matching OMQ.java artifact on Linux x86_64, macOS aarch64, macOS x86_64,
-and Windows x86_64.
+The `omq-rs` dependency compiles OMQ.rs during installation on MRI and
+TruffleRuby. JRuby uses OMQ.java on Java 25 or newer. The Java gem selects the
+matching OMQ.java artifact on Linux x86_64, macOS aarch64, macOS x86_64, and
+Windows x86_64.
 
 ```ruby
 # Gemfile
@@ -77,8 +77,8 @@ the first `bind` or `connect` for a Rust-backed socket.
 ## Development
 
 ```sh
-OMQ_DEV=1 bundle install
-OMQ_DEV=1 bundle exec rake
+OMQ_RS_PATH=/path/to/omq.rs/bindings/ruby bundle install
+OMQ_RS_PATH=/path/to/omq.rs/bindings/ruby bundle exec rake
 ```
 
 ## License

gems/omq-backend-rust/Rakefile

@@ -19,16 +19,12 @@ GEMSPEC = Gem::Specification.load(GEMSPEC_FILE) ||
           abort("Could not load #{GEMSPEC_FILE}")
 
 JAVA_GEMSPEC_FILE = "omq-backend-rust-java.gemspec"
-JAVA_GEM_PATH = File.join("pkg", "omq-backend-rust-#{OMQ::Rust::VERSION}-java.gem")
+JAVA_GEM_PATH = File.join("pkg", "omq-backend-rust-#{OMQ::Backend::Rust::VERSION}-java.gem")
 
 if RUBY_ENGINE == "jruby"
   task :compile
 else
-  require "rb_sys/extensiontask"
-
-  RbSys::ExtensionTask.new("omq_backend_rust", GEMSPEC) do |ext|
-    ext.lib_dir = "lib/omq/rust"
-  end
+  task :compile
 end
 
 desc "Build omq-backend-rust Java platform gem into pkg"