Drop support for EOL AR v6.1 (#178)

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       max-parallel: 8
       matrix:
-        activerecord: ["6.1", "7.2", "8.0", "head"]
+        activerecord: ["7.2", "8.0", "head"]
         ruby: ["3.1", "3.2", "3.3", "head"]
         mysql: ["5.7", "8.0"]
         adapter: ["mysql2", "trilogy"]

.ruby-version

@@ -1 +1 @@
-3.2.2
+3.3.6

Appraisals

@@ -1,8 +1,3 @@
-appraise "activerecord-6.1" do
-  gem "activerecord", "6.1.0"
-  gem "activerecord-trilogy-adapter"
-end
-
 appraise "activerecord-7.2" do
   gem "activerecord", "7.2.2.1"
 end

lib/lhm/throttler/replica_lag.rb

@@ -134,7 +134,7 @@ def prepare_connection_config(config_proc)
             raise ArgumentError, "Expected #{config_proc.inspect} to respond to `call`"
           end
         else
-          db_config
+          ActiveRecord::Base.connection_pool.db_config.configuration_hash.dup
         end
         config.deep_symbolize_keys!
         config[:host] = @host
@@ -147,23 +147,6 @@ def query_connection(query, result)
         Lhm.logger.info "Unable to connect and/or query #{host}: #{e}"
         [nil]
       end
-
-      private
-
-      def db_config
-        if ar_supports_db_config?
-          ActiveRecord::Base.connection_pool.db_config.configuration_hash.dup
-        else
-          ActiveRecord::Base.connection_pool.spec.config.dup
-        end
-      end
-
-      def ar_supports_db_config?
-        # https://api.rubyonrails.org/v6.0/classes/ActiveRecord/ConnectionAdapters/ConnectionPool.html <-- has spec
-        # vs
-        # https://api.rubyonrails.org/v6.1/classes/ActiveRecord/ConnectionAdapters/ConnectionPool.html <-- has db_config
-        ActiveRecord::VERSION::MAJOR > 6 || ActiveRecord::VERSION::MAJOR == 6 && ActiveRecord::VERSION::MINOR >= 1
-      end
     end
   end
 end

spec/unit/throttler/replica_lag_spec.rb

@@ -66,11 +66,7 @@
     describe 'with active record config' do
       it 'logs and creates client' do
         active_record_config = { username: 'user', password: 'pw', database: 'db' }
-        if ActiveRecord::VERSION::MAJOR > 6 || ActiveRecord::VERSION::MAJOR == 6 && ActiveRecord::VERSION::MINOR >= 1
-          ActiveRecord::Base.stubs(:connection_pool).returns(stub(db_config: stub(configuration_hash: active_record_config)))
-        else
-          ActiveRecord::Base.stubs(:connection_pool).returns(stub(spec: stub(config: active_record_config)))
-        end
+        ActiveRecord::Base.stubs(:connection_pool).returns(stub(db_config: stub(configuration_hash: active_record_config)))
 
         DATABASE.client.stubs(:new).returns(mock())