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Simulated & actual (manual/skipped) PostgreSQL auto-reconnection tests.

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commit 6d5f4de4c420ebb906109668f5702a537ac77692 1 parent 0d63cda
Steve Jorgensen authored
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1  activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -474,6 +474,7 @@ def active?
def reconnect!
clear_cache!
@connection.reset
+ @open_transactions = 0
configure_connection
end
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72 activerecord/test/cases/adapters/postgresql/connection_test.rb
@@ -81,5 +81,77 @@ def test_schema_names_logs_name
assert_equal 'SCHEMA', @connection.logged[0][1]
end
+ def test_reconnection_after_simulated_disconnection_with_verify
+ assert @connection.active?
+ original_connection_pid = @connection.query('select pg_backend_pid()')
+
+ # Fail with bad connection after next query attempt.
+ connection_class = class << @connection ; self ; end
+ connection_class.class_eval <<-CODE
+ def query_fake(*args)
+ if @called ||= false
+ @connection.stubs(:status).returns(PCconn::CONNECTION_BAD)
+ raise PGError
+ else
+ @called = true
+ @connection.unstub(:status)
+ query_unfake(*args)
+ end
+ end
+
+ alias query_unfake query
+ alias query query_fake
+ CODE
+
+ begin
+ @connection.verify!
+ new_connection_pid = @connection.query('select pg_backend_pid()')
+ ensure
+ connection_class.class_eval <<-CODE
+ alias query query_unfake
+ undef query_fake
+ CODE
+ end
+
+ assert_equal original_connection_pid, new_connection_pid, "Should have a new underlying connection pid"
+ end
+
+ # Must have with_manual_interventions set to true for this
+ # test to run.
+ # When prompted, restart the PostgreSQL server with the
+ # "-m fast" option or kill the individual connection assuming
+ # you know the incantation to do that.
+ # To restart PostgreSQL 9.1 on OS X, installed via MacPorts, ...
+ # sudo su postgres -c "pg_ctl restart -D /opt/local/var/db/postgresql91/defaultdb/ -m fast"
+ def test_reconnection_after_actual_disconnection_with_verify
+ skip "with_manual_interventions is false in configuration" unless ARTest.config['with_manual_interventions']
+
+ original_connection_pid = @connection.query('select pg_backend_pid()')
+
+ # Sanity check.
+ assert @connection.active?
+
+ puts 'Kill the connection now (e.g. by restarting the PostgreSQL ' +
+ 'server with the "-m fast" option) and then press enter.'
+ $stdin.gets
+
+ @connection.verify!
+
+ assert @connection.active?
+
+ # If we get no exception here, then either we re-connected successfully, or
+ # we never actually got disconnected.
+ new_connection_pid = @connection.query('select pg_backend_pid()')
+
+ assert_not_equal original_connection_pid, new_connection_pid,
+ "umm -- looks like you didn't break the connection, because we're still " +
+ "successfully querying with the same connection pid."
+
+ # Repair all fixture connections so other tests won't break.
+ @fixture_connections.each do |c|
+ c.verify!
+ end
+ end
+
end
end
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2  activerecord/test/config.example.yml
@@ -1,5 +1,7 @@
default_connection: <%= defined?(JRUBY_VERSION) ? 'jdbcsqlite3' : 'sqlite3' %>
+with_manual_interventions: false
+
connections:
jdbcderby:
arunit: activerecord_unittest
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