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// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef GENERIC_CONFIG_BACKEND_RECOVERY_H
#define GENERIC_CONFIG_BACKEND_RECOVERY_H
#include <util/reconnect_ctl.h>
#include <database/server_collection.h>
#include <dhcpsrv/config_backend_dhcp4_mgr.h>
#include <dhcpsrv/testutils/generic_backend_unittest.h>
namespace isc {
namespace dhcp {
namespace test {
/// @brief Test fixture for verifying config backend database connection
/// loss-recovery behavior.
class GenericConfigBackendDbLostCallbackTest : public ::testing::Test {
public:
/// @brief Constructor
GenericConfigBackendDbLostCallbackTest();
/// @brief Destructor
virtual ~GenericConfigBackendDbLostCallbackTest();
/// @brief Abstract method for destroying the back end specific schema
virtual void destroySchema() = 0;
/// @brief Abstract method for creating the back end specific schema
virtual void createSchema() = 0;
/// @brief Abstract method which returns a valid back end specific connection
/// string
virtual std::string validConnectionString() = 0;
/// @brief Abstract method which returns an invalid back end specific connection
/// string
virtual std::string invalidConnectionString() = 0;
/// @brief Abstract method which registers a CB backend type.
virtual void registerBackendType() = 0;
/// @brief Abstract method which unregisters a CB backend type.
virtual void unregisterBackendType() = 0;
/// @brief Abstract method which sets the IOService instance in the CB
/// implementation object.
///
/// @param io_service pointer to the IOService instance to use. It may be
/// an empty pointer.
virtual void setConfigBackendImplIOService(isc::asiolink::IOServicePtr io_service) = 0;
/// @brief Abstract method which sets the IOService instance in the CB
virtual void addBackend(const std::string& access) = 0;
/// @brief Abstract method which sets the IOService instance in the CB
virtual db::ServerCollection getAllServers() = 0;
/// @brief Prepares the class for a test.
///
/// Invoked by gtest prior test entry, we create the
/// appropriate schema and create a basic DB manager to
/// wipe out any prior instance
virtual void SetUp();
/// @brief Pre-text exit clean up
///
/// Invoked by gtest upon test exit, we destroy the schema
/// we created.
virtual void TearDown();
/// @brief Verifies open failures do NOT invoke db lost callback
///
/// The db lost callback should only be invoked after successfully
/// opening the DB and then subsequently losing it. Failing to
/// open should be handled directly by the application layer.
void testNoCallbackOnOpenFailure();
/// @brief Verifies the CB manager's behavior if DB connection is lost
///
/// This function creates a CB manager with a back end that supports
/// connectivity lost callback. It verifies connectivity by issuing a known
/// valid query. Next it simulates connectivity lost by identifying and
/// closing the socket connection to the CB backend. It then reissues the
/// query and verifies that:
/// -# The Query throws DbOperationError (rather than exiting)
/// -# The registered DbLostCallback was invoked
/// -# The registered DbRecoveredCallback was invoked
void testDbLostAndRecoveredCallback();
/// @brief Verifies the CB manager's behavior if DB connection is lost
///
/// This function creates a CB manager with a back end that supports
/// connectivity lost callback. It verifies connectivity by issuing a known
/// valid query. Next it simulates connectivity lost by identifying and
/// closing the socket connection to the CB backend. It then reissues the
/// query and verifies that:
/// -# The Query throws DbOperationError (rather than exiting)
/// -# The registered DbLostCallback was invoked
/// -# The registered DbFailedCallback was invoked
void testDbLostAndFailedCallback();
/// @brief Verifies the CB manager's behavior if DB connection is lost
///
/// This function creates a CB manager with a back end that supports
/// connectivity lost callback. It verifies connectivity by issuing a known
/// valid query. Next it simulates connectivity lost by identifying and
/// closing the socket connection to the CB backend. It then reissues the
/// query and verifies that:
/// -# The Query throws DbOperationError (rather than exiting)
/// -# The registered DbLostCallback was invoked
/// -# The registered DbRecoveredCallback was invoked after two reconnect
/// attempts (once failing and second triggered by timer)
void testDbLostAndRecoveredAfterTimeoutCallback();
/// @brief Verifies the CB manager's behavior if DB connection is lost
///
/// This function creates a CB manager with a back end that supports
/// connectivity lost callback. It verifies connectivity by issuing a known
/// valid query. Next it simulates connectivity lost by identifying and
/// closing the socket connection to the CB backend. It then reissues the
/// query and verifies that:
/// -# The Query throws DbOperationError (rather than exiting)
/// -# The registered DbLostCallback was invoked
/// -# The registered DbFailedCallback was invoked after two reconnect
/// attempts (once failing and second triggered by timer)
void testDbLostAndFailedAfterTimeoutCallback();
/// @brief Callback function registered with the CB manager
bool db_lost_callback(util::ReconnectCtlPtr /* not_used */) {
return (++db_lost_callback_called_);
}
/// @brief Flag used to detect calls to db_lost_callback function
uint32_t db_lost_callback_called_;
/// @brief Callback function registered with the CB manager
bool db_recovered_callback(util::ReconnectCtlPtr /* not_used */) {
return (++db_recovered_callback_called_);
}
/// @brief Flag used to detect calls to db_recovered_callback function
uint32_t db_recovered_callback_called_;
/// @brief Callback function registered with the CB manager
bool db_failed_callback(util::ReconnectCtlPtr /* not_used */) {
return (++db_failed_callback_called_);
}
/// @brief Flag used to detect calls to db_failed_callback function
uint32_t db_failed_callback_called_;
/// The IOService object, used for all ASIO operations.
isc::asiolink::IOServicePtr io_service_;
};
} // namespace test
} // namespace dhcp
} // namespace isc
#endif // GENERIC_CONFIG_BACKEND_RECOVERY_H
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