Fix for initial routers DNS resolution (cherry-pick) #850
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* Migrating tests to testkit Short summary of this update: - removed migrated tests - verifyConnectivity support - resolver support - consume support Test mapping (dest: stub/routing.py): - shouldHandleAcquireReadSession -> test_should_read_successfully_from_reader_using_session_run - shouldHandleAcquireReadTransaction -> test_should_read_successfully_from_reader_using_tx_function - shouldHandleAcquireReadSessionAndTransaction -> test_should_read_successfully_from_reader_using_tx_run - shouldRoundRobinReadServers -> test_should_round_robin_readers_when_reading_using_session_run - shouldRoundRobinReadServersWhenUsingTransaction -> test_should_round_robin_readers_when_reading_using_tx_run - shouldThrowSessionExpiredIfReadServerDisappears -> test_should_fail_when_reading_from_unexpectedly_interrupting_reader_using_session_run - shouldThrowSessionExpiredIfReadServerDisappearsWhenUsingTransaction -> test_should_fail_when_reading_from_unexpectedly_interrupting_reader_using_tx_run - shouldThrowSessionExpiredIfWriteServerDisappears -> test_should_fail_when_writing_on_unexpectedly_interrupting_writer_using_session_run - shouldThrowSessionExpiredIfWriteServerDisappearsWhenUsingTransaction -> test_should_fail_when_writing_on_unexpectedly_interrupting_writer_using_tx_run - shouldHandleAcquireWriteSession -> test_should_write_successfully_on_writer_using_session_run - shouldHandleAcquireWriteTransaction -> test_should_write_successfully_on_writer_using_tx_function - shouldHandleAcquireWriteSessionAndTransaction -> test_should_write_successfully_on_writer_using_tx_run - shouldRoundRobinWriteSessions -> test_should_round_robin_writers_when_writing_using_session_run - shouldRoundRobinWriteSessionsInTransaction -> test_should_round_robin_writers_when_writing_using_tx_run - shouldFailOnNonDiscoverableServer -> test_should_fail_discovery_when_router_fails_with_procedure_not_found_code - shouldFailRandomFailureInGetServers -> test_should_fail_discovery_when_router_fails_with_unknown_code - shouldHandleLeaderSwitchWhenWriting -> test_should_fail_when_writing_on_writer_that_returns_not_a_leader_code - shouldHandleLeaderSwitchWhenWritingWithoutConsuming -> test_should_fail_when_writing_without_explicit_consumption_on_writer_that_returns_not_a_leader_code - shouldHandleLeaderSwitchWhenWritingInTransaction -> test_should_fail_when_writing_on_writer_that_returns_not_a_leader_code_using_tx_run - shouldUseWriteSessionModeAndInitialBookmark -> test_should_use_write_session_mode_and_initial_bookmark_when_writing_using_tx_run - shouldUseReadSessionModeAndInitialBookmark -> test_should_use_read_session_mode_and_initial_bookmark_when_reading_using_tx_run - shouldPassBookmarkFromTransactionToTransaction -> test_should_pass_bookmark_from_tx_to_tx_using_tx_run - shouldRetryReadTransactionUntilSuccess -> test_should_retry_read_tx_until_success - shouldRetryWriteTransactionUntilSuccess -> test_should_retry_write_tx_until_success - shouldRetryReadTransactionAndPerformRediscoveryUntilSuccess -> test_should_retry_read_tx_and_rediscovery_until_success - shouldRetryWriteTransactionAndPerformRediscoveryUntilSuccess -> test_should_retry_write_tx_and_rediscovery_until_success - shouldUseInitialRouterForRediscoveryWhenAllOtherRoutersAreDead -> test_should_use_initial_router_for_discovery_when_others_unavailable - shouldInvokeProcedureGetRoutingTableWhenServerVersionPermits -> test_should_successfully_read_from_readable_router_using_tx_function - shouldSendEmptyRoutingContextInHelloMessage -> test_should_send_empty_hello - shouldServeReadsButFailWritesWhenNoWritersAvailable -> test_should_serve_reads_and_fail_writes_when_no_writers_available - shouldAcceptRoutingTableWithoutWritersAndThenRediscover -> test_should_accept_routing_table_without_writers_and_then_rediscover - shouldTreatRoutingTableWithSingleRouterAsValid -> test_should_accept_routing_table_with_single_router - shouldSendMultipleBookmarks -> test_should_successfully_send_multiple_bookmarks - shouldForgetAddressOnDatabaseUnavailableError -> test_should_forget_address_on_database_unavailable_error - shouldUseResolverDuringRediscoveryWhenExistingRoutersFail -> test_should_use_resolver_during_rediscovery_when_existing_routers_fail - shouldRevertToInitialRouterIfKnownRouterThrowsProtocolErrors -> test_should_revert_to_initial_router_if_known_router_throws_protocol_errors * Removing redundant stub server scripts
- shouldSendRoutingContextToServer -> test_should_successfully_get_routing_table_with_context - shouldSendRoutingContextInHelloMessage -> test_should_successfully_get_routing_table_with_context - shouldHandleLeaderSwitchAndRetryWhenWritingInTxFunction -> test_should_write_successfully_on_leader_switch_using_tx_function - shouldSendInitialBookmark -> test_should_use_write_session_mode_and_initial_bookmark_when_writing_using_tx_run - shouldRetryWriteTransactionUntilSuccessWithWhenLeaderIsRemoved -> test_should_retry_write_until_success_with_leader_change_using_tx_function - shouldRetryWriteTransactionUntilSuccessWithWhenLeaderIsRemovedV3 -> test_should_retry_write_until_success_with_leader_shutdown_during_tx_using_tx_function
Adding support for supportsMultiDB call. And exporting the following tests to testkit: - shouldServerWithBoltV4SupportMultiDb -> test_should_successfully_check_if_support_for_multi_db_is_available - shouldServerWithBoltV3NotSupportMultiDb -> test_should_successfully_check_if_support_for_multi_db_is_available Removing redundant scripts
Removed RoutingDriverMultidatabaseBoltKitIT Migrated tests: - shouldDiscoverForDatabase -> test_should_read_successfully_from_reader_using_session_run (this tests seems to cover the same use-case and uses a non-default DB for 4+ versions) - shouldRetryOnEmptyDiscoveryResult -> test_should_read_successfully_on_empty_discovery_result_using_session_run - shouldThrowRoutingErrorIfDatabaseNotFound -> test_should_fail_with_routing_failure_on_db_not_found_discovery_failure - shouldBeAbleToServeReachableDatabase -> test_should_read_successfully_from_reachable_db_after_trying_unreachable_db (message check has been removed) - shouldPassSystemBookmarkWhenGettingRoutingTableForMultiDB -> test_should_pass_system_bookmark_when_getting_rt_for_multi_db (seems to be applicable to V4 only, also the stub server doesn't seem to check bookmarks) - shouldIgnoreSystemBookmarkWhenGettingRoutingTable -> test_should_ignore_system_bookmark_when_getting_rt_for_multi_db - shouldDriverVerifyConnectivity -> test_should_successfully_get_routing_table_with_context (pre-existing test that already tests the connectivity) Also removed redundant scripts and added code support to DriverError
* Fix for initial routers DNS resolution This update fixes the following issue: neo4j#833 The desired behaviour for getting a routing table from the initial router (either on bootstrap or when all known routers have failed) is: - resolve the domain name to all IPs - attempt getting a routing table from all of them until first one succeeds by: - getting a connection - trying to get a successful routing table response Prior to this change, the connection pools were created for host and port pairs. When domain name of the host resolves to multiple IP addresses, such pools provide connections to those IPs as a group. While this works for readers and writers, it negatively impacts the routing table fetching process as there is no guarantee which IP address the provided connection is setup for. This update delivers the following changes: - connection pools for routers are IP address based, which allows for deterministic connection retrieval - the resolved IP address set is kept up-to-date (in case known router IPs change) to make sure that the unused connection pools are flushed - the domain name resolution logic has been made configurable (it is private at the moment and is used to facilitate testing) - the testkit backend has been updated to support the domain name resolution configuration (a new test has been added to testkit to cover the issue described above) - the testkit backend has been updated to support connection timeout driver configuration - several tests have been updated to adopt the new changes * Updating test name
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This is a cherry-pick of the following fix: #849
The following has been included as well: