Use timeout parameters when run on supported Ruby version

Signed-off-by: Shizuo Fujita <[email protected]>

Author: Watson1978

README.md

@@ -150,11 +150,11 @@ If `false`, `Logger#post` raises an error when nonblocking write gets `EAGAIN` (
 
 #### connect_timeout (Integer)
 
-Specify timeout in seconds from connecting. Default: `nil`
+Specify timeout in seconds from connecting. This parameter is available with Ruby 3.0 or above. Default: `nil`
 
 #### resolve_timeout (Integer)
 
-Specify timeout in seconds from when the hostname resolution starts. Default: `nil`
+Specify timeout in seconds from when the hostname resolution starts. This parameter is available with Ruby 3.0 or above. Default: `nil`
 
 #### buffer_overflow_handler (Proc)
 

fluent-logger.gemspec

@@ -21,8 +21,6 @@ Gem::Specification.new do |gem|
   gem.require_paths = ['lib']
   gem.license       = "Apache-2.0"
 
-  gem.required_ruby_version = '>= 3.0'
-
   gem.add_dependency "msgpack", ">= 1.0.0", "< 2"
 
   # logger gem that isn't default gems as of Ruby 3.5

lib/fluent/logger/fluent_logger.rb

@@ -173,7 +173,11 @@ def create_socket!
         if @socket_path
           @con = UNIXSocket.new(@socket_path)
         else
-          @con = TCPSocket.new(@host, @port, connect_timeout: @connect_timeout, resolv_timeout: @resolv_timeout)
+          if supported_timeout?
+            @con = TCPSocket.new(@host, @port, connect_timeout: @connect_timeout, resolv_timeout: @resolv_timeout)
+          else
+            @con = TCPSocket.new(@host, @port)
+          end
           if @tls_options
             context = OpenSSL::SSL::SSLContext.new
             if @tls_options[:insecure]
@@ -381,6 +385,10 @@ def wait_writeable?(e)
           true
         end
       end
+
+      def supported_timeout?
+        @supported_timeout ||= Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.0.0')
+      end
     end
   end
 end