Enable zstd compression (karafka#132)

.travis.yml

@@ -1,6 +1,6 @@
 language: ruby
-
-sudo: false
+dist: bionic
+os: linux
 
 services:
   - docker
@@ -22,16 +22,8 @@ rvm:
 before_install:
   - gem update --system
   - |
-    r_eng="$(ruby -e 'STDOUT.write RUBY_ENGINE')";
-    if [ "$r_eng" == "jruby" ]; then
-      sudo apt-get update && \
-      sudo apt-get install -y git && \
-      sudo apt-get install -y libpthread-stubs0-dev && \
-      sudo apt-get install -y build-essential && \
-      sudo apt-get install -y zlib1g-dev && \
-      sudo apt-get install -y libssl-dev && \
-      sudo apt-get install -y libsasl2-dev
-    fi
+    sudo apt-get update && \
+    sudo apt-get install -y git build-essential libpthread-stubs0-dev zlib1g-dev libzstd-dev libssl-dev libsasl2-dev
 
 before_script:
   - docker-compose up -d

ext/Rakefile

@@ -65,7 +65,7 @@ namespace :build do
 
     recipe = MiniPortile.new("librdkafka", version)
     recipe.files << "https://github.com/edenhill/librdkafka/archive/#{ref}.tar.gz"
-    recipe.configure_options = ["--host=#{recipe.host}"]
+    recipe.configure_options = ["--host=#{recipe.host}","--enable-static", "--enable-zstd"]
     recipe.cook
 
     ext = recipe.host.include?("darwin") ? "dylib" : "so"

spec/rdkafka/config_spec.rb

@@ -90,6 +90,12 @@
       }.to raise_error(Rdkafka::Config::ConfigError, "No such configuration property: \"invalid.key\"")
     end
 
+    it "should allow configuring zstd compression" do
+      config = Rdkafka::Config.new('compression.codec' => 'zstd')
+      expect(config.producer).to be_a Rdkafka::Producer
+      config.producer.close
+    end
+
     it "should raise an error when client creation fails for a consumer" do
       config = Rdkafka::Config.new(
         "security.protocol" => "SSL",