seanpdoyle
diff --git a/‎Gemfile
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diff --git a/‎Gemfile.lock
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diff --git a/‎activerecord/CHANGELOG.md
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diff --git a/‎activerecord/RUNNING_UNIT_TESTS.rdoc
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diff --git a/‎activerecord/Rakefile
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diff --git a/‎activerecord/bin/test
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diff --git a/‎activerecord/lib/active_record/connection_adapters/trilogy/errors.rb
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diff --git a/‎activerecord/lib/active_record/connection_adapters/trilogy/lost_connection_exception_translator.rb
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@@ -149,6 +149,7 @@ platforms :ruby, :windows do
   group :db do
     gem "pg", "~> 1.3"
     gem "mysql2", "~> 0.5"
+    gem "trilogy", "~> 2.4"
   end
 end
 
 
@@ -507,6 +507,7 @@ GEM
     timeout (0.3.2)
     tomlrb (2.0.3)
     trailblazer-option (0.1.2)
+    trilogy (2.4.0)
     turbo-rails (1.3.2)
       actionpack (>= 6.0.0)
       activejob (>= 6.0.0)
@@ -617,6 +618,7 @@ DEPENDENCIES
   sucker_punch
   tailwindcss-rails
   terser (>= 1.1.4)
+  trilogy (~> 2.4)
   turbo-rails
   tzinfo-data
   w3c_validators (~> 1.3.6)
 
@@ -1,3 +1,23 @@
+*   Introduce adapter for Trilogy database client
+
+    Trilogy is a MySQL-compatible database client. Rails applications can use Trilogy
+    by configuring their `config/database.yml`:
+
+    ```yaml
+    development:
+    adapter: trilogy
+    database: blog_development
+    pool: 5
+    ```
+
+    Or by using the `DATABASE_URL` environment variable:
+
+    ```ruby
+    ENV['DATABASE_URL'] # => "trilogy://localhost/blog_development?pool=5"
+    ```
+
+    *Adrianna Chang*
+
 *   `after_commit` callbacks defined on models now execute in the correct order.
 
     ```ruby
 
@@ -21,6 +21,7 @@ example:
 Simply executing <tt>bundle exec rake test</tt> is equivalent to the following:
 
   $ bundle exec rake test:mysql2
+  $ bundle exec rake test:trilogy
   $ bundle exec rake test:postgresql
   $ bundle exec rake test:sqlite3
 
 
@@ -18,24 +18,24 @@ def run_without_aborting(*tasks)
   abort "Errors running #{errors.join(', ')}" if errors.any?
 end
 
-desc "Run mysql2, sqlite, and postgresql tests by default"
+desc "Run mysql2, trilogy, sqlite, and postgresql tests by default"
 task default: :test
 
 task :package
 
-desc "Run mysql2, sqlite, and postgresql tests"
+desc "Run mysql2, trilogy, sqlite, and postgresql tests"
 task :test do
   tasks = defined?(JRUBY_VERSION) ?
     %w(test_jdbcmysql test_jdbcsqlite3 test_jdbcpostgresql) :
-    %w(test_mysql2 test_sqlite3 test_postgresql)
+    %w(test_mysql2 test_trilogy test_sqlite3 test_postgresql)
   run_without_aborting(*tasks)
 end
 
 namespace :test do
   task :isolated do
     tasks = defined?(JRUBY_VERSION) ?
       %w(isolated_test_jdbcmysql isolated_test_jdbcsqlite3 isolated_test_jdbcpostgresql) :
-      %w(isolated_test_mysql2 isolated_test_sqlite3 isolated_test_postgresql)
+      %w(isolated_test_mysql2 isolated_test_trilogy isolated_test_sqlite3 isolated_test_postgresql)
     run_without_aborting(*tasks)
   end
 
@@ -56,18 +56,19 @@ namespace :db do
   task drop: ["db:mysql:drop", "db:postgresql:drop"]
 end
 
-%w( mysql2 postgresql sqlite3 sqlite3_mem oracle jdbcmysql jdbcpostgresql jdbcsqlite3 jdbcderby jdbch2 jdbchsqldb ).each do |adapter|
+%w( mysql2 trilogy postgresql sqlite3 sqlite3_mem oracle jdbcmysql jdbcpostgresql jdbcsqlite3 jdbcderby jdbch2 jdbchsqldb ).each do |adapter|
   namespace :test do
     Rake::TestTask.new(adapter => "#{adapter}:env") do |t|
       adapter_short = adapter[/^[a-z0-9]+/]
       t.libs << "test"
       files = (FileList["test/cases/**/*_test.rb"].reject {
         |x| x.include?("/adapters/") || x.include?("/encryption/performance")
       } + FileList["test/cases/adapters/#{adapter_short}/**/*_test.rb"])
-      files = files + FileList["test/cases/adapters/abstract_mysql_adapter/**/*_test.rb"] if adapter == "mysql2"
+      files = files + FileList["test/cases/adapters/abstract_mysql_adapter/**/*_test.rb"] if ["mysql2", "trilogy"].include?(adapter)
 
       t.test_files = files
 
+      t.test_files = files
       t.warning = true
       t.verbose = true
       t.ruby_opts = ["--dev"] if defined?(JRUBY_VERSION)
 
@@ -15,7 +15,7 @@ module Minitest
     opts.separator ""
     opts.separator "Active Record options:"
     opts.on("-a", "--adapter [ADAPTER]",
-            "Run tests using a specific adapter (sqlite3, sqlite3_mem, mysql2, postgresql)") do |adapter|
+            "Run tests using a specific adapter (sqlite3, sqlite3_mem, mysql2, trilogy, postgresql)") do |adapter|
       ENV["ARCONN"] = adapter.strip
     end
 
 
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+module ActiveRecord
+  module ConnectionAdapters
+    module Trilogy
+      module Errors
+        # ServerShutdown will be raised when the database server was shutdown.
+        class ServerShutdown < ActiveRecord::ConnectionFailed
+        end
+
+        # ServerLost will be raised when the database connection was lost.
+        class ServerLost < ActiveRecord::ConnectionFailed
+        end
+
+        # ServerGone will be raised when the database connection is gone.
+        class ServerGone < ActiveRecord::ConnectionFailed
+        end
+
+        # BrokenPipe will be raised when a system process connection fails.
+        class BrokenPipe < ActiveRecord::ConnectionFailed
+        end
+
+        # SocketError will be raised when Ruby encounters a network error.
+        class SocketError < ActiveRecord::ConnectionFailed
+        end
+
+        # ConnectionResetByPeer will be raised when a network connection is closed
+        # outside the sytstem process.
+        class ConnectionResetByPeer < ActiveRecord::ConnectionFailed
+        end
+
+        # ClosedConnection will be raised when the Trilogy encounters a closed
+        # connection.
+        class ClosedConnection < ActiveRecord::ConnectionFailed
+        end
+
+        # InvalidSequenceId will be raised when Trilogy ecounters an invalid sequence
+        # id.
+        class InvalidSequenceId < ActiveRecord::ConnectionFailed
+        end
+
+        # UnexpectedPacket will be raised when Trilogy ecounters an unexpected
+        # response packet.
+        class UnexpectedPacket < ActiveRecord::ConnectionFailed
+        end
+      end
+    end
+  end
+end
@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+module ActiveRecord
+  module ConnectionAdapters
+    module Trilogy
+      class LostConnectionExceptionTranslator
+        attr_reader :exception, :message, :error_number
+
+        def initialize(exception, message, error_number)
+          @exception = exception
+          @message = message
+          @error_number = error_number
+        end
+
+        def translate
+          translate_database_exception || translate_ruby_exception || translate_trilogy_exception
+        end
+
+        private
+          ER_SERVER_SHUTDOWN = 1053
+          CR_SERVER_LOST = 2013
+          CR_SERVER_LOST_EXTENDED = 2055
+          CR_SERVER_GONE_ERROR = 2006
+
+          def translate_database_exception
+            case error_number
+            when ER_SERVER_SHUTDOWN
+              Errors::ServerShutdown.new(message)
+            when CR_SERVER_LOST, CR_SERVER_LOST_EXTENDED
+              Errors::ServerLost.new(message)
+            when CR_SERVER_GONE_ERROR
+              Errors::ServerGone.new(message)
+            end
+          end
+
+          def translate_ruby_exception
+            case exception
+            when Errno::EPIPE
+              Errors::BrokenPipe.new(message)
+            when SocketError, IOError
+              Errors::SocketError.new(message)
+            when ::Trilogy::ConnectionError
+              if message.include?("Connection reset by peer")
+                Errors::ConnectionResetByPeer.new(message)
+              end
+            end
+          end
+
+          def translate_trilogy_exception
+            return unless exception.is_a?(::Trilogy::Error)
+
+            case message
+            when /TRILOGY_CLOSED_CONNECTION/
+              Errors::ClosedConnection.new(message)
+            when /TRILOGY_INVALID_SEQUENCE_ID/
+              Errors::InvalidSequenceId.new(message)
+            when /TRILOGY_UNEXPECTED_PACKET/
+              Errors::UnexpectedPacket.new(message)
+            end
+          end
+      end
+    end
+  end
+end