Merge pull request rails#49944 from composerinteralia/connectiontimeouterror-pool

Add connection pool to connection timeout errors

Author: jhawthorn

activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb

@@ -614,7 +614,7 @@ def checkout_for_exclusive_access(checkout_timeout)
 
           msg << " (#{thread_report.join(', ')})" if thread_report.any?
 
-          raise ExclusiveConnectionTimeoutError, msg
+          raise ExclusiveConnectionTimeoutError.new(msg, connection_pool: self)
         end
 
         def with_new_connections_blocked
@@ -670,6 +670,8 @@ def acquire_connection(checkout_timeout)
             reap
             @available.poll(checkout_timeout)
           end
+        rescue ConnectionTimeoutError => ex
+          raise ex.set_pool(self)
         end
 
         #--

activerecord/test/cases/connection_pool_test.rb

@@ -110,9 +110,10 @@ def test_full_pool_exception
         @pool.checkout_timeout = 0.001 # no need to delay test suite by waiting the whole full default timeout
         @pool.size.times { assert @pool.checkout }
 
-        assert_raises(ConnectionTimeoutError) do
+        error = assert_raises(ConnectionTimeoutError) do
           @pool.checkout
         end
+        assert_equal @pool, error.connection_pool
       end
 
       def test_full_pool_blocks
@@ -615,9 +616,10 @@ def test_non_bang_disconnect_and_clear_reloadable_connections_throw_exception_if
         @pool.checkout_timeout = 0.001 # no need to delay test suite by waiting the whole full default timeout
         [:disconnect, :clear_reloadable_connections].each do |group_action_method|
           @pool.with_connection do |connection|
-            assert_raises(ExclusiveConnectionTimeoutError) do
+            error = assert_raises(ExclusiveConnectionTimeoutError) do
               new_thread { @pool.public_send(group_action_method) }.join
             end
+            assert_equal @pool, error.connection_pool
           end
         end
       ensure