console_adapter: support console gem v1.30

fluentd.gemspec

@@ -66,6 +66,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency("test-unit-rr", ["~> 1.0"])
   gem.add_development_dependency("oj", [">= 2.14", "< 4"])
   gem.add_development_dependency("async-http", "~> 0.86")
+  gem.add_development_dependency("console", "~> 1.30")
   gem.add_development_dependency("aws-sigv4", ["~> 1.8"])
   gem.add_development_dependency("aws-sdk-core", ["~> 3.191"])
   gem.add_development_dependency("rexml", ["~> 3.2"])

lib/fluent/log/console_adapter.rb

@@ -21,9 +21,7 @@ class Log
     # Async gem which is used by http_server helper switched logger mechanism to
     # Console gem which isn't complatible with Ruby's standard Logger (since
     # v1.17). This class adapts it to Fluentd's logger mechanism.
-    class ConsoleAdapter < Gem::Version.new(Console::VERSION) >= Gem::Version.new("1.25") ?
-      Console::Output::Terminal : Console::Terminal::Logger
-
+    class ConsoleAdapter < Console::Output::Terminal
       def self.wrap(logger)
         _, level = Console::Logger::LEVELS.find { |key, value|
           if logger.level <= 0
@@ -58,10 +56,10 @@ def call(subject = nil, *arguments, name: nil, severity: 'info', **options, &blo
           level = 'warn'
         end
 
-        @io.seek(0)
-        @io.truncate(0)
+        @stream.seek(0)
+        @stream.truncate(0)
         super
-        @logger.send(level, @io.string.chomp)
+        @logger.send(level, @stream.string.chomp)
       end
     end
   end