Add Ruby 3.0 to CI matrix. (#2459)

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, jruby-9.2]
+        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0', jruby-9.2]
         env: [PURE_RUBY, KITCHEN_SINK]
         exclude:
           - ruby: jruby-9.1

Gemfile

@@ -73,6 +73,8 @@ group :test do
     gem 'cucumber', '2.99.0'
     # hashdiff drop support for Ruby under 2.0 since 0.3.9
     gem 'hashdiff', '0.3.8'
+    # crack added a dependency on rexml in 0.4.5
+    gem 'crack', '0.4.4'
   elsif RUBY_VERSION == '2.0.0'
     # public_suffix released 3.0.3 which support ruby >= 2.1
     gem 'public_suffix', '2.0.5'

gems/aws-eventstream/spec/decoder_spec.rb

@@ -81,7 +81,7 @@ module EventStream
           expect(msg).to be_nil
           expect(eof).to be true
 
-          expect(decoder.send(:message_buffer)).to eq(first_part)
+          expect(decoder.send(:message_buffer).force_encoding('utf-8')).to eq(first_part)
 
           msg, eof = decoder.decode_chunk(second_part)
           expect_msg = SpecHelper.expected_decoded_message(file)

gems/aws-sdk-core/lib/aws-sdk-core/xml/parser.rb

@@ -70,6 +70,11 @@ def set_default_engine
           [:ox, :oga, :libxml, :nokogiri, :rexml].each do |name|
             @engine ||= try_load_engine(name)
           end
+          unless @engine
+            raise 'Unable to find a compatible xml library. ' \
+            'Ensure that you have installed or added to your Gemfile one of ' \
+            'ox, oga, libxml, nokogiri or rexml'
+          end
         end
 
         private

gems/aws-sdk-core/lib/aws-sdk-core/xml/parser/engines/rexml.rb

@@ -1,8 +1,16 @@
 # frozen_string_literal: true
 
+use_system_rexml = ((RUBY_VERSION <=> "2.0.0") < 0)
+if use_system_rexml
+  require "rbconfig"
+  $LOAD_PATH.unshift(RbConfig::CONFIG["rubylibdir"])
+end
+
 require 'rexml/document'
 require 'rexml/streamlistener'
 
+$LOAD_PATH.shift if use_system_rexml
+
 module Aws
   module Xml
     class Parser

gems/aws-sdk-core/lib/seahorse/client/h2/connection.rb

@@ -75,7 +75,7 @@ def new_stream
         def connect(endpoint)
           @mutex.synchronize {
             if @status == :ready
-              tcp, addr = _tcp_socket(endpoint) 
+              tcp, addr = _tcp_socket(endpoint)
               debug_output("opening connection to #{endpoint.host}:#{endpoint.port} ...")
               _nonblocking_connect(tcp, addr)
               debug_output('opened')
@@ -245,4 +245,3 @@ def _default_ca_directory
     end
   end
 end
-