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-rw-r--r--src/lib/config_backend/Makefile.am25
-rw-r--r--src/lib/config_backend/Makefile.in804
-rw-r--r--src/lib/config_backend/base_config_backend.h87
-rw-r--r--src/lib/config_backend/base_config_backend_mgr.h220
-rw-r--r--src/lib/config_backend/base_config_backend_pool.h649
-rw-r--r--src/lib/config_backend/constants.h90
-rw-r--r--src/lib/config_backend/tests/Makefile.am37
-rw-r--r--src/lib/config_backend/tests/Makefile.in1006
-rw-r--r--src/lib/config_backend/tests/config_backend_mgr_unittest.cc557
-rw-r--r--src/lib/config_backend/tests/run_unittests.cc19
10 files changed, 3494 insertions, 0 deletions
diff --git a/src/lib/config_backend/Makefile.am b/src/lib/config_backend/Makefile.am
new file mode 100644
index 0000000..2b51675
--- /dev/null
+++ b/src/lib/config_backend/Makefile.am
@@ -0,0 +1,25 @@
+SUBDIRS = . tests
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+EXTRA_DIST = base_config_backend.h
+EXTRA_DIST += base_config_backend_mgr.h
+EXTRA_DIST += base_config_backend_pool.h
+EXTRA_DIST += constants.h
+
+# The message file should be in the distribution.
+#EXTRA_DIST += config_backend.dox
+
+CLEANFILES = *.gcno *.gcda
+
+# Specify the headers for copying into the installation directory tree.
+libkea_cb_includedir = $(pkgincludedir)/config_backend
+libkea_cb_include_HEADERS = \
+ base_config_backend.h \
+ base_config_backend_mgr.h \
+ base_config_backend_pool.h \
+ constants.h
+
diff --git a/src/lib/config_backend/Makefile.in b/src/lib/config_backend/Makefile.in
new file mode 100644
index 0000000..19670b8
--- /dev/null
+++ b/src/lib/config_backend/Makefile.in
@@ -0,0 +1,804 @@
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+
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+CLEANFILES = *.gcno *.gcda
+
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+libkea_cb_include_HEADERS = \
+ base_config_backend.h \
+ base_config_backend_mgr.h \
+ base_config_backend_pool.h \
+ constants.h
+
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diff --git a/src/lib/config_backend/base_config_backend.h b/src/lib/config_backend/base_config_backend.h
new file mode 100644
index 0000000..9e38919
--- /dev/null
+++ b/src/lib/config_backend/base_config_backend.h
@@ -0,0 +1,87 @@
+// Copyright (C) 2018-2022 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 BASE_CONFIG_BACKEND_H
+#define BASE_CONFIG_BACKEND_H
+
+#include <database/database_connection.h>
+
+#include <boost/shared_ptr.hpp>
+#include <cstdint>
+#include <set>
+#include <string>
+
+namespace isc {
+namespace cb {
+
+/// @brief Interface for Kea server specific configuration backend
+/// implementations.
+///
+/// Each Kea server (e.g. DHCPv4 server) needs to implement its own
+/// interface to store and fetch its configuration from the databases.
+/// This is because each Kea server uses a different set of
+/// configuration information. This is a base interface which should
+/// be implemented (and extended) by respective Kea servers to provide
+/// API to store and fetch configuration information from a database.
+/// Such implementation is called configuration backend. Each
+/// configuration backend facilitates a single database type, e.g. MySQL
+/// database. In order to support multiple database types, i.e. MySQL,
+/// PostgreSQL, each Kea server will have to implement 2 separate configuration
+/// backends, one for each database type.
+class BaseConfigBackend {
+public:
+
+ /// @brief Virtual destructor.
+ virtual ~BaseConfigBackend() { }
+
+ /// @brief Returns backend type in the textual format.
+ ///
+ /// @return Name of the storage for configurations, e.g. "mysql",
+ /// "postgresql" and so forth.
+ virtual std::string getType() const = 0;
+
+ /// @brief Returns backend host.
+ ///
+ /// This is used by the @c BaseConfigBackendPool to select backend
+ /// when @c BackendSelector is specified.
+ ///
+ /// @return host on which the database is located.
+ virtual std::string getHost() const = 0;
+
+ /// @brief Returns backend port number.
+ ///
+ /// This is used by the @c BaseConfigBackendPool to select backend
+ /// when @c BackendSelector is specified.
+ ///
+ /// @return Port number on which database service is available.
+ virtual uint16_t getPort() const = 0;
+
+ /// @brief Flag which indicates if the config backend has an unusable
+ /// connection.
+ ///
+ /// @return true if there is at least one unusable connection, false
+ /// otherwise.
+ virtual bool isUnusable() {
+ return (false);
+ }
+
+ /// @brief Return backend parameters.
+ ///
+ /// Returns the backend parameters.
+ ///
+ /// @return Parameters of the backend.
+ virtual isc::db::DatabaseConnection::ParameterMap getParameters() const {
+ return (isc::db::DatabaseConnection::ParameterMap());
+ }
+};
+
+/// @brief Shared pointer to the @c BaseConfigBackend.
+typedef boost::shared_ptr<BaseConfigBackend> BaseConfigBackendPtr;
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // BASE_CONFIG_BACKEND_H
diff --git a/src/lib/config_backend/base_config_backend_mgr.h b/src/lib/config_backend/base_config_backend_mgr.h
new file mode 100644
index 0000000..92d6858
--- /dev/null
+++ b/src/lib/config_backend/base_config_backend_mgr.h
@@ -0,0 +1,220 @@
+// Copyright (C) 2018-2021 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 BASE_CONFIG_BACKEND_MGR_H
+#define BASE_CONFIG_BACKEND_MGR_H
+
+#include <config_backend/base_config_backend.h>
+#include <database/database_connection.h>
+#include <database/backend_selector.h>
+#include <exceptions/exceptions.h>
+#include <boost/shared_ptr.hpp>
+#include <functional>
+#include <map>
+#include <string>
+
+namespace isc {
+namespace cb {
+
+/// @brief Base class for Configuration Backend Managers (CBM).
+///
+/// Each Kea server supporting Configuration Backend feature implements
+/// a "manager" class which holds information about supported and
+/// configured backends and provides access to the backends. This is
+/// similar to @c HostMgr and @c LeaseMgr singletons being used by the
+/// DHCP servers.
+///
+/// The Config Backend Managers are typically implemented as singletons
+/// which can be accessed from any place within the server code. This
+/// includes server configuration, data fetching during normal server
+/// operation and data management, including processing of control
+/// commands implemented within hooks libraries.
+///
+/// The @c BaseConfigBackendMgr is a base class for all CBMs implemented
+/// for respective Kea servers. It includes mechanisms to register config
+/// backend factory functions and to create instances of the backends using
+/// those factory functions as a result of server configuration. The mechanism
+/// of factory functions registration is useful in cases when the config
+/// backend is implemented within the hook library. Such hook library
+/// registers factory function in its @c load function and the server
+/// simply calls this function to create the instance of this backend when
+/// instructed to do so via configuration. Similar mechanism exists in
+/// DHCP @c HostMgr.
+///
+/// Unlike @c HostMgr, the CBMs do not directly expose API to fetch and
+/// manipulate the data in the database. This is done via, so called,
+/// Configuration Backends Pools. See @c BaseConfigBackendPool for
+/// details. The @c BaseConfigBackendMgr is provided with the pool type
+/// via class template parameter. Respective CBM implementations
+/// use their own pools, which provide APIs appropriate for those
+/// implementations.
+///
+/// @tparam ConfgBackendPoolType Type of the configuration backend pool
+/// to be used by the manager. It must derive from @c BaseConfigBackendPool
+/// template class.
+template<typename ConfigBackendPoolType>
+class BaseConfigBackendMgr {
+public:
+
+ /// @brief Pointer to the configuration backend pool.
+ typedef boost::shared_ptr<ConfigBackendPoolType> ConfigBackendPoolPtr;
+
+ /// @brief Type of the backend factory function.
+ ///
+ /// Factory function returns a pointer to the instance of the configuration
+ /// backend created.
+ typedef std::function<typename ConfigBackendPoolType::ConfigBackendTypePtr
+ (const db::DatabaseConnection::ParameterMap&)> Factory;
+
+ /// @brief Constructor.
+ BaseConfigBackendMgr()
+ : factories_(), pool_(new ConfigBackendPoolType()) {
+ }
+
+ /// @brief Registers new backend factory function for a given backend type.
+ ///
+ /// The typical usage of this function is to make the CBM aware of a
+ /// configuration backend implementation. This implementation may exist
+ /// in a hooks library. In such case, this function should be called from
+ /// the @c load function in this library. When the backend is registered,
+ /// the server will use it when required by the configuration, i.e. a
+ /// user includes configuration backend of that type in the
+ /// "config-databases" list.
+ ///
+ /// If the backend of the given type has already been registered, perhaps
+ /// by another hooks library, the CBM will refuse to register another
+ /// backend of the same type.
+ ///
+ /// @param db_type Backend type, e.g. "mysql".
+ /// @param factory Pointer to the backend factory function.
+ ///
+ /// @return true if the backend has been successfully registered, false
+ /// if another backend of this type already exists.
+ bool registerBackendFactory(const std::string& db_type,
+ const Factory& factory) {
+ // Check if this backend has been already registered.
+ if (factories_.count(db_type)) {
+ return (false);
+ }
+
+ // Register the new backend.
+ factories_.insert(std::make_pair(db_type, factory));
+ return (true);
+ }
+
+ /// @brief Unregisters the backend factory function for a given backend type.
+ ///
+ /// This function is used to remove the factory function and all backend instances
+ /// for a given backend type. Typically, it would be called when unloading the
+ /// a config backend hook library, and thus called by the library's @c unload
+ /// function.
+ ///
+ /// @param db_type Backend type, e.g. "mysql".
+ ///
+ /// @return false if no factory for the given type was unregistered, true
+ /// if the factory was removed.
+ bool unregisterBackendFactory(const std::string& db_type) {
+ // Look for it.
+ auto index = factories_.find(db_type);
+
+ // If it's there remove it
+ if (index != factories_.end()) {
+ factories_.erase(index);
+ pool_->delAllBackends(db_type);
+ return (true);
+
+ }
+
+ return (false);
+ }
+
+ /// @brief Create an instance of a configuration backend.
+ ///
+ /// This method uses provided @c dbaccess string representing database
+ /// connection information to create an instance of the database
+ /// backend. If the specified backend type is not supported, i.e. there
+ /// is no relevant factory function registered, an exception is thrown.
+ ///
+ /// @param dbaccess Database access string being a collection of
+ /// key=value pairs.
+ ///
+ /// @throw InvalidParameter if access string lacks database type value.
+ /// @throw db::InvalidType if the type of the database backend is not
+ /// supported.
+ /// @throw Unexpected if the backend factory function returned NULL.
+ void addBackend(const std::string& dbaccess) {
+ // Parse the access string into a map of parameters.
+ db::DatabaseConnection::ParameterMap parameters =
+ db::DatabaseConnection::parse(dbaccess);
+
+ // Get the database type to locate a factory function.
+ db::DatabaseConnection::ParameterMap::iterator it = parameters.find("type");
+ if (it == parameters.end()) {
+ isc_throw(InvalidParameter, "Config backend specification lacks the "
+ "'type' keyword");
+ }
+
+ std::string db_type = it->second;
+ auto index = factories_.find(db_type);
+
+ // No match?
+ if (index == factories_.end()) {
+ isc_throw(db::InvalidType, "The type of the configuration backend: '" <<
+ db_type << "' is not supported");
+ }
+
+ // Call the factory and push the pointer on sources.
+ auto backend = index->second(parameters);
+ if (!backend) {
+ isc_throw(Unexpected, "Config database " << db_type <<
+ " factory returned NULL");
+ }
+
+ // Backend instance created successfully.
+ pool_->addBackend(backend);
+ }
+
+ /// @brief Removes all backends from the pool.
+ void delAllBackends() {
+ pool_->delAllBackends();
+ }
+
+ /// @brief Delete a config backend manager.
+ ///
+ /// Delete the first instance of a config database manager which matches
+ /// specific parameters.
+ /// This should have the effect of closing the database connection.
+ ///
+ /// @param db_type Backend to remove.
+ /// @param dbaccess Database access string being a collection of
+ /// key=value pairs.
+ /// @param if_unusable Flag which indicates if the config backend should be
+ /// deleted only if it is unusable.
+ /// @return false when not removed because it is not found or because it is
+ /// still usable (if_unusable is true), true otherwise.
+ bool delBackend(const std::string& db_type, const std::string& dbaccess,
+ bool if_unusable) {
+ return (pool_->del(db_type, dbaccess, if_unusable));
+ }
+
+ /// @brief Returns underlying config backend pool.
+ ConfigBackendPoolPtr getPool() const {
+ return (pool_);
+ }
+
+protected:
+
+ /// @brief A map holding registered backend factory functions.
+ std::map<std::string, Factory> factories_;
+
+ /// @brief Pointer to the configuration backends pool.
+ ConfigBackendPoolPtr pool_;
+};
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // BASE_CONFIG_BACKEND_MGR_H
diff --git a/src/lib/config_backend/base_config_backend_pool.h b/src/lib/config_backend/base_config_backend_pool.h
new file mode 100644
index 0000000..1c83677
--- /dev/null
+++ b/src/lib/config_backend/base_config_backend_pool.h
@@ -0,0 +1,649 @@
+// Copyright (C) 2018-2021 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 BASE_CONFIG_BACKEND_POOL_H
+#define BASE_CONFIG_BACKEND_POOL_H
+
+#include <cc/data.h>
+#include <config_backend/base_config_backend.h>
+#include <database/backend_selector.h>
+#include <database/database_connection.h>
+#include <database/db_exceptions.h>
+#include <database/server_selector.h>
+#include <functional>
+#include <list>
+#include <string>
+
+namespace isc {
+namespace cb {
+
+
+/// @brief Base class for configuration backend pools.
+///
+/// Each Kea server supporting databases as a configuration repository can
+/// use multiple database instances simultaneously. A pool is a collection
+/// of database backends used by a particular server. Different Kea servers
+/// use different pools because they store and fetch different configuration
+/// information. For example: DHCPv4 server stores and fetches IPv4 subnets,
+/// and DHCPv6 server stores and fetches IPv6 subnets. Therefore, each pool
+/// type will expose a different API calls.
+///
+/// This template class is a base class for all pools used by various servers.
+/// It implements mechanisms for managing multiple backends and for forwarding
+/// API calls to one or many database backends depending on the selections
+/// made via @c BackendSelector class.
+///
+/// @tparam ConfigBackendType Type of the configuration backend. This must
+/// be a class deriving from @c BaseConfigBackend class. It is a class
+/// dedicated to a particular server type, e.g. DHCPv4 server, and from
+/// which database specific backends derive.
+template<typename ConfigBackendType>
+class BaseConfigBackendPool {
+public:
+
+ /// @brief Shared pointer to the Configuration Backend used.
+ typedef boost::shared_ptr<ConfigBackendType> ConfigBackendTypePtr;
+
+ /// @brief Virtual destructor.
+ virtual ~BaseConfigBackendPool() { }
+
+ /// @brief Adds a backend to the pool.
+ ///
+ /// @param backend Pointer to a backend to be added.
+ void addBackend(ConfigBackendTypePtr backend) {
+ backends_.push_back(backend);
+ }
+
+ /// @brief Deletes all backends from the pool.
+ void delAllBackends() {
+ backends_.clear();
+ }
+
+ /// @brief Deletes all backends of the given type from the pool.
+ ///
+ /// @param db_type Backend to remove.
+ void delAllBackends(const std::string& db_type) {
+ typename std::list<ConfigBackendTypePtr>::iterator backend = backends_.begin();
+
+ while (backend != backends_.end()) {
+ if ((*backend)->getType() == db_type) {
+ backend = backends_.erase(backend);
+ } else {
+ ++backend;
+ }
+ }
+ }
+
+ /// @brief Deletes all backends of the given type from the pool.
+ ///
+ /// @param db_type Backend to remove.
+ /// @param dbaccess Database access string being a collection of
+ /// key=value pairs.
+ /// @param if_unusable Flag which indicates if the config backend should be
+ /// deleted only if it is unusable.
+ /// @return false when not removed because it is not found or because it is
+ /// still usable (if_unusable is true), true otherwise.
+ bool del(const std::string& db_type, const std::string& dbaccess,
+ bool if_unusable) {
+ isc::db::DatabaseConnection::ParameterMap parameters =
+ isc::db::DatabaseConnection::parse(dbaccess);
+ bool deleted = false;
+ if (if_unusable) {
+ deleted = true;
+ }
+
+ typename std::list<ConfigBackendTypePtr>::iterator backend = backends_.begin();
+
+ while (backend != backends_.end()) {
+ if ((*backend)->getType() != db_type || (*backend)->getParameters() != parameters) {
+ ++backend;
+ } else if (if_unusable && (!(*backend)->isUnusable())) {
+ deleted = false;
+ ++backend;
+ } else {
+ backends_.erase(backend);
+ return (true);
+ }
+ }
+ return (deleted);
+ }
+
+protected:
+
+ /// @brief Retrieve a single configuration property from the pool.
+ ///
+ /// This is common method for retrieving a single configuration property
+ /// from the databases. The server specific backends call this method to
+ /// retrieve a single object. For example, the DHCPv4 configuration backend
+ /// pool may use this function to implement a @c getSubnet4 method:
+ ///
+ /// @code
+ /// Subnet4Ptr getSubnet4(const SubnetID& subnet_id,
+ /// const BackendSelector& backend_selector,
+ /// const ServerSelector& server_selector) const {
+ /// Subnet4Ptr subnet;
+ /// getPropertyPtrConst<Subnet4Ptr, const SubnetID&>
+ /// (&ConfigBackendDHCPv4::getSubnet4, backend_selector,
+ /// server_selector, subnet, subnet_id);
+ /// return (subnet);
+ /// }
+ /// @endcode
+ ///
+ /// where @c ConfigBackendDHCPv4::getSubnet4 has the following signature:
+ ///
+ /// @code
+ /// Subnet4Ptr getSubnet4(const ServerSelector&, const SubnetID&) const;
+ /// @endcode
+ ///
+ /// If the backend selector is set to "unspecified", this method will iterate
+ /// over the existing backends and call the @c MethodPointer method on each
+ /// backend. It will return the first non-null (or non-zero) value returned
+ /// by this call. For example: if the first backend returns non-null value,
+ /// this value is returned via @c property argument and the calls for the
+ /// rest of the backends are skipped.
+ ///
+ /// @tparam PropertyType Type of the object returned by the backend call.
+ /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+ /// method to be invoked.
+ /// @tparam Args Parameter pack holding types of the arguments provided
+ /// in the call to this method.
+ ///
+ /// @param MethodPointer Pointer to the backend method to be called.
+ /// @param backend_selector Backend selector.
+ /// @param server_selector Server selector.
+ /// @param [out] property Reference to the shared pointer where retrieved
+ /// property should be assigned.
+ /// @param input Values to be used as input to the backend call.
+ ///
+ /// @throw db::NoSuchDatabase if no database matching the given selector
+ /// was found.
+ template<typename PropertyType, typename... FnPtrArgs, typename... Args>
+ void getPropertyPtrConst(PropertyType (ConfigBackendType::*MethodPointer)
+ (const db::ServerSelector&, FnPtrArgs...) const,
+ const db::BackendSelector& backend_selector,
+ const db::ServerSelector& server_selector,
+ PropertyType& property,
+ Args... input) const {
+
+ // If no particular backend is selected, call each backend and return
+ // the first non-null (non zero) value.
+ if (backend_selector.amUnspecified()) {
+ for (auto backend : backends_) {
+ property = ((*backend).*MethodPointer)(server_selector, input...);
+ if (property) {
+ break;
+ }
+ }
+
+ } else {
+ // Backend selected, find the one that matches selection.
+ auto backends = selectBackends(backend_selector);
+ if (!backends.empty()) {
+ for (auto backend : backends) {
+ property = ((*backend).*MethodPointer)(server_selector, input...);
+ if (property) {
+ break;
+ }
+ }
+
+ } else {
+ isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+ << backend_selector.toText());
+ }
+ }
+ }
+
+ /// @brief Retrieve a single configuration property from the backend.
+ ///
+ /// This is common method for retrieving a single configuration property
+ /// from the selected database without specifying the server selector. The
+ /// server specific backends call this method to retrieve a single object.
+ /// For example, the DHCPv4 configuration backend pool may use this function
+ /// to implement a @c getServer4 method:
+ ///
+ /// @code
+ /// ServerPtr getServer4(const BackendSelector& backend_selector,
+ /// const std::string& server_tag) const {
+ /// ServerPtr server;
+ /// getPropertyPtrConst<ServerPtr, const std::string&>
+ /// (&ConfigBackendDHCPv4::getServer4, backend_selector,
+ /// server_tag);
+ /// return (server);
+ /// }
+ /// @endcode
+ ///
+ /// where @c ConfigBackendDHCPv4::getServer4 has the following signature:
+ ///
+ /// @code
+ /// ServerPtr getServer4(const std::string&) const;
+ /// @endcode
+ ///
+ /// This method is used in cases when server selector is not applicable.
+ ///
+ /// @tparam PropertyType Type of the object returned by the backend call.
+ /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+ /// method to be invoked.
+ /// @tparam Args Parameter pack holding types of the arguments provided
+ /// in the call to this method.
+ ///
+ /// @param MethodPointer Pointer to the backend method to be called.
+ /// @param backend_selector Backend selector.
+ /// @param [out] property Reference to the shared pointer where retrieved
+ /// property should be assigned.
+ /// @param input Values to be used as input to the backend call.
+ ///
+ /// @throw db::NoSuchDatabase if no database matching the given selector
+ /// was found.
+ /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+ /// were found.
+ template<typename PropertyType, typename... FnPtrArgs, typename... Args>
+ void getBackendPropertyPtrConst(PropertyType (ConfigBackendType::*MethodPointer)
+ (FnPtrArgs...) const,
+ const db::BackendSelector& backend_selector,
+ PropertyType& property,
+ Args... input) const {
+ auto backends = selectBackends(backend_selector);
+ if (backends.empty()) {
+ isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+ << backend_selector.toText());
+
+ } else if (backends.size() > 1) {
+ isc_throw(db::AmbiguousDatabase, "more than one database found for "
+ "selector: " << backend_selector.toText());
+ }
+
+ property = ((*(*(backends.begin())).*MethodPointer)(input...));
+ }
+
+ /// @brief Retrieve multiple configuration properties from the pool.
+ ///
+ /// This is a common method for retrieving multiple configuration properties
+ /// from the databases. The server specific backends call this method to
+ /// retrieve multiple objects of the same type. For example, the DHCPv6
+ /// configuration backend pool may use this function to implement a
+ /// @c getSubnets6 method:
+ ///
+ /// @code
+ /// Subnet6Collection getModifiedSubnets6(const BackendSelector& backend_selector,
+ /// const ServerSelector& server_selector,
+ /// const ptime& modification_time) const {
+ /// Subnet6Collection subnets;
+ /// getMultiplePropertiesConst<Subnet6Collection, const ptime&>
+ /// (&ConfigBackendDHCPv6::getSubnets6, backend_selector, server_selector,
+ /// subnets, modification_time);
+ /// return (subnets);
+ /// }
+ /// @endcode
+ ///
+ /// where @c ConfigBackendDHCPv6::getSubnets6 has the following signature:
+ ///
+ /// @code
+ /// Subnet6Collection getSubnets6(const ServerSelector&, const ptime&) const;
+ /// @endcode
+ ///
+ /// If the backend selector is set to "unspecified", this method will iterate
+ /// over existing backends and call the @c MethodPointer method on each
+ /// backend. It will return the first non-empty list returned by one of the
+ /// backends.
+ ///
+ /// @tparam PropertyCollectionType Type of the container into which the
+ /// properties are stored.
+ /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+ /// method to be invoked.
+ /// @tparam Args Parameter pack holding types of the arguments provided
+ /// in the call to this method.
+ ///
+ /// @param MethodPointer Pointer to the backend method to be called.
+ /// @param backend_selector Backend selector.
+ /// @param server_selector Server selector.
+ /// @param [out] properties Reference to the collection of retrieved properties.
+ /// @param input Values to be used as input to the backend call.
+ ///
+ /// @throw db::NoSuchDatabase if no database matching the given selector
+ /// was found.
+ template<typename PropertyCollectionType, typename... FnPtrArgs, typename... Args>
+ void getMultiplePropertiesConst(PropertyCollectionType (ConfigBackendType::*MethodPointer)
+ (const db::ServerSelector&, FnPtrArgs...) const,
+ const db::BackendSelector& backend_selector,
+ const db::ServerSelector& server_selector,
+ PropertyCollectionType& properties,
+ Args... input) const {
+ if (backend_selector.amUnspecified()) {
+ for (auto backend : backends_) {
+ properties = ((*backend).*MethodPointer)(server_selector, input...);
+ if (!properties.empty()) {
+ break;
+ }
+ }
+
+ } else {
+ auto backends = selectBackends(backend_selector);
+ if (!backends.empty()) {
+ for (auto backend : backends) {
+ properties = ((*backend).*MethodPointer)(server_selector, input...);
+ if (!properties.empty()) {
+ break;
+ }
+ }
+
+ } else {
+ isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+ << backend_selector.toText());
+ }
+ }
+ }
+
+ /// @brief Retrieve all configuration properties from the pool.
+ ///
+ /// This is a common method for retrieving all configuration properties
+ /// from the databases. The server specific backends call this method
+ /// to retrieve all objects of the same type. For example, the DHCPv4
+ /// configuration backend pool may use this function to implement a
+ /// @c getAllSubnets4 method:
+ ///
+ /// @code
+ /// Subnet4Collection getAllSubnets4(const BackendSelector&, const ServerSelector&) const {
+ /// Subnet4Collection subnets;
+ /// getAllPropertiesConst<Subnet6Collection>
+ /// (&ConfigBackendDHCPv4::getAllSubnets4, subnets, backend_selector,
+ /// server_selector);
+ /// return (subnets);
+ /// }
+ /// @endcode
+ ///
+ /// where @c ConfigBackendDHCPv4::getAllSubnets4 has the following signature:
+ ///
+ /// @code
+ /// Subnet4Collection getAllSubnets4(const ServerSelector&) const;
+ /// @endcode
+ ///
+ /// If the backend selector is set to "unspecified", this method will iterate
+ /// over existing backends and call the @c MethodPointer method on each
+ /// backend. It will return the first non-empty list returned by one of the
+ /// backends.
+ ///
+ /// @tparam PropertyCollectionType Type of the container into which the
+ /// properties are stored.
+ ///
+ /// @param MethodPointer Pointer to the backend method to be called.
+ /// @param backend_selector Backend selector.
+ /// @param server_selector Server selector.
+ /// @param [out] properties Reference to the collection of retrieved properties.
+ ///
+ /// @throw db::NoSuchDatabase if no database matching the given selector
+ /// was found.
+ template<typename PropertyCollectionType>
+ void getAllPropertiesConst(PropertyCollectionType (ConfigBackendType::*MethodPointer)
+ (const db::ServerSelector&) const,
+ const db::BackendSelector& backend_selector,
+ const db::ServerSelector& server_selector,
+ PropertyCollectionType& properties) const {
+ if (backend_selector.amUnspecified()) {
+ for (auto backend : backends_) {
+ properties = ((*backend).*MethodPointer)(server_selector);
+ if (!properties.empty()) {
+ break;
+ }
+ }
+
+ } else {
+ auto backends = selectBackends(backend_selector);
+ if (!backends.empty()) {
+ for (auto backend : backends) {
+ properties = ((*backend).*MethodPointer)(server_selector);
+ if (!properties.empty()) {
+ break;
+ }
+ }
+
+ } else {
+ isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+ << backend_selector.toText());
+ }
+ }
+ }
+
+ /// @brief Get all configuration properties from the backend.
+ ///
+ /// This is a common method for retrieving all configuration properties
+ /// from the selected database without specifying the server selector. The
+ /// server specific backends call this method to retrieve all objects of
+ /// the same type. For example, the DHCPv4 configuration backend pool may
+ /// use this function to implement a @c getAllServers4 method:
+ ///
+ /// @code
+ /// ServerCollection getAllServers4(const BackendSelector&) const {
+ /// ServerCollection servers;
+ /// getAllBackendPropertiesConst<ServerCollection>
+ /// (&ConfigBackendDHCPv4::getAllServers4, backend_selector, servers);
+ /// return (servers);
+ /// }
+ /// @endcode
+ ///
+ /// where @c ConfigBackendDHCPv4::getAllServers4 has the following signature:
+ ///
+ /// @code
+ /// ServerCollection getAllServers4() const;
+ /// @endcode
+ ///
+ /// This method is used in cases when server selector is not applicable.
+ ///
+ /// @tparam PropertyCollectionType Type of the container into which the
+ /// properties are stored.
+ ///
+ /// @param MethodPointer Pointer to the backend method to be called.
+ /// @param backend_selector Backend selector.
+ /// @param [out] properties Reference to the collection of retrieved properties.
+ ///
+ /// @throw db::NoSuchDatabase if no database matching the given selector
+ /// was found.
+ /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+ /// were found.
+ template<typename PropertyCollectionType>
+ void getAllBackendPropertiesConst(PropertyCollectionType (ConfigBackendType::*MethodPointer)() const,
+ const db::BackendSelector& backend_selector,
+ PropertyCollectionType& properties) const {
+ auto backends = selectBackends(backend_selector);
+ if (backends.empty()) {
+ isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+ << backend_selector.toText());
+
+ } else if (backends.size() > 1) {
+ isc_throw(db::AmbiguousDatabase, "more than one database found for "
+ "selector: " << backend_selector.toText());
+ }
+
+ properties = (*(*(backends.begin())).*MethodPointer)();
+ }
+
+ /// @brief Add, update or delete property from the backend.
+ ///
+ /// This is a common method for storing a single configuration property in
+ /// a database, updating an existing property or deleting the property.
+ /// The server specific backends call this method. For example,
+ /// the DHCPv6 configuration backend pool may use this function to implement
+ /// a @c createUpdateSubnet6 method:
+ ///
+ /// @code
+ /// void createUpdateSubnet6(const Subnet6Ptr& subnet,
+ /// const BackendSelector& backend_selector,
+ /// const ServerSelector& server_selector) {
+ /// createUpdateDeleteProperty<void, const Subnet6Ptr&>
+ /// (&ConfigBackendDHCPv6::createUpdateSubnet6, backend_selector,
+ /// server_selector, subnet, selector);
+ /// }
+ /// @endcode
+ ///
+ /// where @c ConfigBackendDHCPv6::createUpdateSubnet6 has the following
+ /// signature:
+ ///
+ /// @code
+ /// void createUpdateSubnet6(const ServerSelector&, const Subnet6Ptr&);
+ /// @endcode
+ ///
+ /// The backend selector must point to exactly one backend. If more than one
+ /// backend is selected, an exception is thrown. If no backend is selected
+ /// an exception is thrown either.
+ ///
+ /// @tparam ReturnValue Returned value, typically void or uint64_t.
+ /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+ /// method to be invoked.
+ /// @tparam Args Parameter pack holding types of the arguments provided
+ /// in the call to this method.
+ ///
+ /// @param MethodPointer Pointer to the backend method to be called.
+ /// @param backend_selector Backend selector.
+ /// @param server_selector Server selector.
+ /// @param input Objects used as arguments to the backend method to be
+ /// called.
+ ///
+ /// @throw db::NoSuchDatabase if no database matching the given selector
+ /// was found.
+ /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+ /// were found.
+ /// @return Number of affected properties, if the value is non void.
+ template<typename ReturnValue, typename... FnPtrArgs, typename... Args>
+ ReturnValue createUpdateDeleteProperty(ReturnValue (ConfigBackendType::*MethodPointer)
+ (const db::ServerSelector&, FnPtrArgs...),
+ const db::BackendSelector& backend_selector,
+ const db::ServerSelector& server_selector,
+ Args... input) {
+ auto backends = selectBackends(backend_selector);
+ if (backends.empty()) {
+ isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+ << backend_selector.toText());
+
+ } else if (backends.size() > 1) {
+ isc_throw(db::AmbiguousDatabase, "more than one database found for "
+ "selector: " << backend_selector.toText());
+ }
+
+ return ((*(*(backends.begin())).*MethodPointer)(server_selector, input...));
+ }
+
+ /// @brief Add, update or delete property from the backend.
+ ///
+ /// This is a common method for storing a single configuration property in
+ /// a database, updating an existing property or deleting the property
+ /// without specifying the server selector. The server specific backends
+ /// call this method. For example, the DHCPv4 configuration backend pool
+ /// may use this function to implement the @c createUpdateServer4 method:
+ ///
+ /// @code
+ /// void createUpdateServer4(const BackendSelector& backend_selector,
+ /// const ServerSelector& server_selector,
+ /// const ServerPtr& server) {
+ /// createUpdateDeleteBackendProperty<void, const ServerPtr&>
+ /// (&ConfigBackendDHCPv4::createUpdateServer4, backend_selector,
+ /// server);
+ /// }
+ /// @endcode
+ ///
+ /// where @c ConfigBackendDHCPv4::createUpdateServer4 has the following
+ /// signature:
+ ///
+ /// @code
+ /// void createUpdateServer4(const ServerPtr&);
+ /// @endcode
+ ///
+ /// This method is used in cases when server selector is not applicable.
+ ///
+ /// @tparam ReturnValue Returned value, typically void or uint64_t.
+ /// @tparam FnPtrArgs Parameter pack holding argument types of the backend
+ /// method to be invoked.
+ /// @tparam Args Parameter pack holding types of the arguments provided
+ /// in the call to this method.
+ ///
+ /// @param MethodPointer Pointer to the backend method to be called.
+ /// @param backend_selector Backend selector.
+ /// @param input Objects used as arguments to the backend method to be
+ /// called.
+ ///
+ /// @throw db::NoSuchDatabase if no database matching the given selector
+ /// was found.
+ /// @throw db::AmbiguousDatabase if multiple databases matching the selector
+ /// were found.
+ /// @return Number of affected properties, if the value is non void.
+ template<typename ReturnValue, typename... FnPtrArgs, typename... Args>
+ ReturnValue createUpdateDeleteBackendProperty(ReturnValue (ConfigBackendType::*MethodPointer)
+ (FnPtrArgs...),
+ const db::BackendSelector& backend_selector,
+ Args... input) {
+ auto backends = selectBackends(backend_selector);
+ if (backends.empty()) {
+ isc_throw(db::NoSuchDatabase, "no such database found for selector: "
+ << backend_selector.toText());
+
+ } else if (backends.size() > 1) {
+ isc_throw(db::AmbiguousDatabase, "more than one database found for "
+ "selector: " << backend_selector.toText());
+ }
+
+ return ((*(*(backends.begin())).*MethodPointer)(input...));
+ }
+
+ /// @brief Selects existing backends matching the selector.
+ ///
+ /// This method selects backends matching the selector. If the selector is
+ /// "unspecified" or there is no backend in the pool, an empty list is returned.
+ ///
+ /// @param backend_selector Selector for which matching backends should be selected.
+ std::list<ConfigBackendTypePtr>
+ selectBackends(const db::BackendSelector& backend_selector) const {
+
+ std::list<ConfigBackendTypePtr> selected;
+
+ // In case there is only one backend and the caller hasn't specified
+ // any particular backend, simply return it.
+ if ((backends_.size() == 1) && backend_selector.amUnspecified()) {
+ selected.push_back(*backends_.begin());
+ return (selected);
+ }
+
+ // For other cases we return empty list.
+ if (backends_.empty() || backend_selector.amUnspecified()) {
+ return (selected);
+ }
+
+ // Go over all backends.
+ for (auto backend : backends_) {
+ // If backend type is specified and it is not matching,
+ // do not select this backend.
+ if ((backend_selector.getBackendType() != db::BackendSelector::Type::UNSPEC) &&
+ (backend_selector.getBackendType() !=
+ db::BackendSelector::stringToBackendType(backend->getType()))) {
+ continue;
+ }
+
+ // If the host has been specified by the backend's host is not
+ // matching, do not select this backend.
+ if ((!backend_selector.getBackendHost().empty()) &&
+ (backend_selector.getBackendHost() != backend->getHost())) {
+ continue;
+ }
+
+ // If the port has been specified by the backend's port is not
+ // matching, do not select this backend.
+ if ((backend_selector.getBackendPort() != 0) &&
+ (backend_selector.getBackendPort() != backend->getPort())) {
+ continue;
+ }
+
+ // Passed all checks, so the backend is matching. Add it to the list.
+ selected.push_back(backend);
+ }
+
+ return (selected);
+ }
+
+ /// @brief Holds configuration backends belonging to the pool.
+ std::list<ConfigBackendTypePtr> backends_;
+};
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // BASE_CONFIG_BACKEND_POOL_H
diff --git a/src/lib/config_backend/constants.h b/src/lib/config_backend/constants.h
new file mode 100644
index 0000000..b869a03
--- /dev/null
+++ b/src/lib/config_backend/constants.h
@@ -0,0 +1,90 @@
+// Copyright (C) 2018-2023 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 CONFIG_BACKEND_CONSTANTS_H
+#define CONFIG_BACKEND_CONSTANTS_H
+
+namespace isc {
+namespace cb {
+
+/// @name Constants specifying output buffer lengths.
+///
+/// Config backends create buffers of these sizes to store
+/// fetched variable length data in them.
+///
+//@{
+constexpr unsigned long SUBNET4_PREFIX_BUF_LENGTH = 32;
+
+constexpr unsigned long SUBNET6_PREFIX_BUF_LENGTH = 64;
+
+constexpr unsigned long POOL_ADDRESS6_BUF_LENGTH = 45;
+
+constexpr unsigned long DHCP4O6_INTERFACE_BUF_LENGTH = 128;
+
+constexpr unsigned long DHCP4O6_INTERFACE_ID_BUF_LENGTH = 128;
+
+constexpr unsigned long DHCP4O6_SUBNET_BUF_LENGTH = 64;
+
+constexpr unsigned long BOOT_FILE_NAME_BUF_LENGTH = 512;
+
+constexpr unsigned long CLIENT_CLASS_BUF_LENGTH = 128;
+
+constexpr unsigned long INTERFACE_BUF_LENGTH = 128;
+
+constexpr unsigned long INTERFACE_ID_BUF_LENGTH = 128;
+
+constexpr unsigned long RELAY_BUF_LENGTH = 65536;
+
+constexpr unsigned long REQUIRE_CLIENT_CLASSES_BUF_LENGTH = 65536;
+
+constexpr unsigned long SERVER_HOSTNAME_BUF_LENGTH = 512;
+
+constexpr unsigned long SHARED_NETWORK_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long USER_CONTEXT_BUF_LENGTH = 65536;
+
+constexpr unsigned long OPTION_VALUE_BUF_LENGTH = 65536;
+
+constexpr unsigned long FORMATTED_OPTION_VALUE_BUF_LENGTH = 8192;
+
+constexpr unsigned long OPTION_SPACE_BUF_LENGTH = 128;
+
+constexpr unsigned long OPTION_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long OPTION_ENCAPSULATE_BUF_LENGTH = 128;
+
+constexpr unsigned long OPTION_RECORD_TYPES_BUF_LENGTH = 512;
+
+constexpr unsigned long GLOBAL_PARAMETER_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long GLOBAL_PARAMETER_VALUE_BUF_LENGTH = 65536;
+
+constexpr unsigned long CLIENT_CLASS_NAME_BUF_LENGTH = 128;
+
+constexpr unsigned long CLIENT_CLASS_TEST_BUF_LENGTH = 2048;
+
+constexpr unsigned long CLIENT_CLASS_SNAME_BUF_LENGTH = 128;
+
+constexpr unsigned long CLIENT_CLASS_FILENAME_BUF_LENGTH = 512;
+
+constexpr unsigned long AUDIT_ENTRY_OBJECT_TYPE_BUF_LENGTH = 256;
+
+constexpr unsigned long AUDIT_ENTRY_LOG_MESSAGE_BUF_LENGTH = 65536;
+
+constexpr unsigned long SERVER_TAG_BUF_LENGTH = 64;
+
+constexpr unsigned long SERVER_DESCRIPTION_BUF_LENGTH = 65536;
+
+constexpr unsigned long DNS_NAME_BUF_LENGTH = 255;
+
+constexpr unsigned long ALLOCATOR_TYPE_BUF_LENGTH = 64;
+
+//*}
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif
diff --git a/src/lib/config_backend/tests/Makefile.am b/src/lib/config_backend/tests/Makefile.am
new file mode 100644
index 0000000..a58d143
--- /dev/null
+++ b/src/lib/config_backend/tests/Makefile.am
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+
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+
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+if HAVE_GTEST
+TESTS += libcb_unittests
+
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diff --git a/src/lib/config_backend/tests/Makefile.in b/src/lib/config_backend/tests/Makefile.in
new file mode 100644
index 0000000..95f2bac
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+ @list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
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+check-am: all-am
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+check: check-recursive
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+mostlyclean-generic:
+
+clean-generic:
+ -test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
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+ -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/config_backend/tests/config_backend_mgr_unittest.cc b/src/lib/config_backend/tests/config_backend_mgr_unittest.cc
new file mode 100644
index 0000000..09645e3
--- /dev/null
+++ b/src/lib/config_backend/tests/config_backend_mgr_unittest.cc
@@ -0,0 +1,557 @@
+// Copyright (C) 2018-2023 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/.
+
+#include <config.h>
+
+#include <config_backend/base_config_backend_mgr.h>
+#include <config_backend/base_config_backend_pool.h>
+#include <config_backend/base_config_backend.h>
+#include <database/database_connection.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <list>
+#include <string>
+#include <utility>
+
+using namespace isc;
+using namespace isc::cb;
+using namespace isc::db;
+
+namespace {
+
+/// @brief Defines list of properties retrieved by @c TestConfigBackend.
+///
+/// A single property is a name/value pair, where value is an integer.
+typedef std::list<std::pair<std::string, int> > PropertiesList;
+
+/// @brief Implements configuration backend used in tests.
+///
+/// @c BaseConfigBackend is an abstract class that must be implemented
+/// in order to allow us to test mechanisms implemented in
+/// @c BaseConfigBackendMgr and @c BaseConfigBackendPool.
+///
+/// Normally, a class derived directly from the @c BaseConfigBackend
+/// will merely provide an interface for server specific operations,
+/// e.g. DHCPv4 specific operations, and the database specific classes
+/// will implement this interface. However, for the test purposes it
+/// is convenient to implement them here and let the derivations
+/// only provide the implementations of the @c getType, @c getHost
+/// and @c getPort functions. That way, the logic for adding and
+/// retrieving the data from the backend is implemented only once and
+/// is common accross all test backends.
+///
+/// This class provides a logic for managing test data being a collection
+/// of name/value pairs, i.e. "properties". It contains a list of
+/// properties and the functions for adding the properties, retrieving
+/// a single property and retrieving a collection of properties.
+class TestConfigBackend : public BaseConfigBackend {
+public:
+
+ /// @brief Retrieves first property having a given name.
+ ///
+ /// @param property_name Name of the property to be retrieved.
+ /// @return Value of the property or 0 if property doesn't exist.
+ virtual int getProperty(const ServerSelector&,
+ const std::string& property_name) const {
+ for (auto property : properties_) {
+ if (property.first == property_name) {
+ return (property.second);
+ }
+ }
+ return (0);
+ }
+
+ /// @brief Retrieves first property matching the name and value.
+ ///
+ /// @param property_name Name of the property to be retrieved.
+ /// @param property_value Value of the property to be retrieved.
+ /// @return Value of the property or 0 if the property doesn't exist.
+ virtual int getProperty(const ServerSelector&,
+ const std::string& property_name,
+ const int property_value) const {
+ for (auto property : properties_) {
+ if ((property.first == property_name) &&
+ (property.second == property_value)) {
+ return (property.second);
+ }
+ }
+ return (0);
+ }
+
+ /// @brief Retrieves all properties having a given name.
+ ///
+ /// @param property_name Name of the properties to be retrieved.
+ /// @return List of the properties having a given name. This list is
+ /// empty if no property was found.
+ virtual PropertiesList getProperties(const ServerSelector&,
+ const std::string& property_name) const {
+ PropertiesList properties;
+ for (auto property : properties_) {
+ if (property.first == property_name) {
+ properties.push_back(property);
+ }
+ }
+ return (properties);
+ }
+
+ /// @brief Retrieves all properties.
+ ///
+ /// @return List of all properties held in the backend.
+ virtual PropertiesList getAllProperties(const ServerSelector&) const {
+ return (properties_);
+ }
+
+ /// @brief Creates new property.
+ ///
+ /// @param new_property Property to be added to the backend.
+ virtual void createProperty(const ServerSelector&,
+ const std::pair<std::string, int>& new_property) {
+ properties_.push_back(new_property);
+ }
+
+protected:
+
+ /// @brief Holds list of properties (simulates database).
+ PropertiesList properties_;
+
+};
+
+/// @brief Shared pointer to the @c TestConfigBackend.
+typedef boost::shared_ptr<TestConfigBackend> TestConfigBackendPtr;
+
+/// @brief First implementation of the test config backend.
+///
+/// It simulates being a MySQL backend installed on the
+/// "mysql-host" host and running on port 2345.
+class TestConfigBackendImpl1 : public TestConfigBackend {
+public:
+
+ /// @brief Returns backend type.
+ ///
+ /// @return "mysql".
+ virtual std::string getType() const {
+ return (std::string("mysql"));
+ }
+
+ /// @brief Returns backend host.
+ ///
+ /// @return "mysql-host".
+ virtual std::string getHost() const {
+ return (std::string("mysql-host"));
+ }
+
+ /// @brief Returns backend port.
+ ///
+ /// @return Port number 2345.
+ virtual uint16_t getPort() const {
+ return (2345);
+ }
+
+};
+
+/// @brief Shared pointer to the @c TestConfigBackendImpl1.
+typedef boost::shared_ptr<TestConfigBackendImpl1> TestConfigBackendImpl1Ptr;
+
+/// @brief Second implementation of the test config backend.
+///
+/// It simulates being a Postgres backend installed on the
+/// "postgresql-host" host and running on port 1234.
+class TestConfigBackendImpl2 : public TestConfigBackend {
+public:
+
+ /// @brief Returns backend type.
+ ///
+ /// @return "postgresql".
+ virtual std::string getType() const {
+ return (std::string("postgresql"));
+ }
+
+ /// @brief Returns backend host.
+ ///
+ /// @return "postgresql-host".
+ virtual std::string getHost() const {
+ return (std::string("postgresql-host"));
+ }
+
+ /// @brief Returns backend port.
+ ///
+ /// @return Port number 1234.
+ virtual uint16_t getPort() const {
+ return (1234);
+ }
+};
+
+/// @brief Shared pointer to the @c TestConfigBackendImpl2.
+typedef boost::shared_ptr<TestConfigBackendImpl2> TestConfigBackendImpl2Ptr;
+
+/// @brief Implements test pool of configuration backends.
+///
+/// @c BaseConfigBackendPool template provides mechanics for managing the data
+/// stored in multiple backends. Server specific pools must extend this class
+/// with methods for managing the data appropriate for the server types.
+/// This class provides an example pool implementation for managing the
+/// "properties" being name/value pairs. It extends the base class with
+/// new methods to retrieve a single property and multiple properties. It
+/// also adds a method to create new property. Those methods correspond to
+/// the ones implemented in the @c TestConfigBackend, but also each of
+/// them includes a "database selector" used to indicate the backend to
+/// be used.
+class TestConfigBackendPool : public BaseConfigBackendPool<TestConfigBackend> {
+public:
+
+ /// @brief Retrieves a value of the property.
+ ///
+ /// @param property_name Name of the property which value should be returned.
+ /// @param backend_selector Backend selector. The default value of the selector
+ /// is @c UNSPEC which means that the property will be searched in all backends
+ /// and the first value found will be returned.
+ /// @param server_selector Server selector. The default value is set to @c ALL,
+ /// which means that the property for all servers will be returned.
+ virtual int getProperty(const std::string& property_name,
+ const BackendSelector& backend_selector =
+ BackendSelector::UNSPEC(),
+ const ServerSelector& server_selector =
+ ServerSelector::ALL()) const {
+ int property = 0;
+
+ // If the selector is specified, this method will pick the appropriate
+ // backend and will call getProperty method on this backend. If the
+ // selector is not specified, this method will iterate over existing
+ // backends and call getProperty on them. It will return after finding
+ // the first non-zero value of the property. For example, if the first
+ // backend contains a non-zero value this value will be returned and
+ // the value held in the second backend (if any) won't be fetched.
+ // The template arguments specify the returned value type and the
+ // argument of the getProperty method.
+ getPropertyPtrConst<int, const std::string&>
+ (&TestConfigBackend::getProperty, backend_selector, server_selector,
+ property, property_name);
+ return (property);
+ }
+
+ /// @brief Retrieves value of the property.
+ ///
+ /// @param property_name Name of the property which value should be returned.
+ /// @param property_value Value of the property to be retrieved.
+ /// @param backend_selector Backend selector. The default value of the selector
+ /// is @c UNSPEC which means that the property will be searched in all backends
+ /// and the first value found will be returned.
+ /// @param server_selector Server selector. The default value is set to @c ALL,
+ /// which means that the property for all servers will be returned.
+ virtual int getProperty(const std::string& property_name,
+ const int property_value,
+ const BackendSelector& backend_selector =
+ BackendSelector::UNSPEC(),
+ const ServerSelector& server_selector =
+ ServerSelector::ALL()) const {
+ int property = 0;
+
+ getPropertyPtrConst<int, const std::string&, int>
+ (&TestConfigBackend::getProperty, backend_selector, server_selector,
+ property, property_name, property_value);
+ return (property);
+ }
+
+
+ /// @brief Retrieves multiple properties.
+ ///
+ /// @param property_name Name of the properties which should be retrieved.
+ /// @param backend_selector Backend selector. The default value of the selector
+ /// is @c UNSPEC which means that the properties will be searched in all
+ /// backends and the first non-empty list will be returned.
+ /// @param server_selector Server selector. The default value is set to @c ALL,
+ /// which means that the properties for all servers will be returned.
+ virtual PropertiesList getProperties(const std::string& property_name,
+ const BackendSelector& backend_selector =
+ BackendSelector::UNSPEC(),
+ const ServerSelector& server_selector =
+ ServerSelector::ALL()) const {
+ PropertiesList properties;
+
+ // If the selector is specified, this method will pick the appropriate
+ // backend and will call getProperties method on this backend. If the
+ // selector is not specified, this method will iterate over existing
+ // backends and call getProperties on them. It will return after finding
+ // the first non-empty list of properties in one of the backends.
+ // The template arguments specify the type of the list of properties
+ // and the argument of the getProperties method.
+ getMultiplePropertiesConst<PropertiesList, const std::string&>
+ (&TestConfigBackend::getProperties, backend_selector, server_selector,
+ properties, property_name);
+ return (properties);
+ }
+
+ /// @brief Retrieves all properties.
+ ///
+ /// @param backend_selector Backend selector. The default value of the selector
+ /// is @c UNSPEC which means that the properties will be searched in all
+ /// backends and the first non-empty list will be returned.
+ /// @param server_selector Server selector. The default value is set to @c ALL,
+ /// which means that the properties for all servers will be returned.
+ virtual PropertiesList getAllProperties(const BackendSelector& backend_selector =
+ BackendSelector::UNSPEC(),
+ const ServerSelector& server_selector =
+ ServerSelector::ALL()) const {
+ PropertiesList properties;
+
+ // This method is similar to getMultiplePropertiesConst but it lacks
+ // an argument and it simply returns all properties.
+ getAllPropertiesConst<PropertiesList>
+ (&TestConfigBackend::getAllProperties, backend_selector, server_selector,
+ properties);
+ return (properties);
+ }
+
+ /// @brief Creates new property in a selected backend.
+ ///
+ /// @param new_property New property to be added to a backend.
+ /// @param backend_selector Backend selector. It has no default value.
+ /// @param server_selector The default value is @c ALL which means that
+ /// new property is going to be shared by all servers.
+ virtual void createProperty(const std::pair<std::string, int>& new_property,
+ const BackendSelector& backend_selector,
+ const ServerSelector& server_selector =
+ ServerSelector::ALL()) {
+ createUpdateDeleteProperty<void, const std::pair<std::string, int>&>
+ (&TestConfigBackend::createProperty, backend_selector, server_selector,
+ new_property);
+ }
+};
+
+using TestConfigBackendMgr = BaseConfigBackendMgr<TestConfigBackendPool>;
+
+/// @brief Test fixture class for testing @c ConfigBackendMgr.
+class ConfigBackendMgrTest : public ::testing::Test {
+public:
+
+ /// @brief Constructor.
+ ConfigBackendMgrTest()
+ : config_mgr_() {
+ }
+
+ /// @brief Destructor.
+ ///
+ /// Removes backend instances.
+ ~ConfigBackendMgrTest() {
+ config_mgr_.delAllBackends();
+ }
+
+ /// @brief Creates example database backend called "mysql".
+ ///
+ /// It uses @c TestConfigBackendImpl1.
+ void addTestMySQLBackend() {
+ config_mgr_.registerBackendFactory("mysql", [](const DatabaseConnection::ParameterMap&)
+ -> TestConfigBackendPtr {
+ return (TestConfigBackendImpl1Ptr(new TestConfigBackendImpl1()));
+ });
+
+ config_mgr_.addBackend("type=mysql");
+ }
+
+ /// @brief Creates example database backend called "postgresql".
+ ///
+ /// It uses @c TestConfigBackendImpl2.
+ void addTestPgSQLBackend() {
+ config_mgr_.registerBackendFactory("postgresql", [](const DatabaseConnection::ParameterMap&)
+ -> TestConfigBackendPtr {
+ return (TestConfigBackendImpl2Ptr(new TestConfigBackendImpl2()));
+ });
+
+ // Actually create the backends.
+ config_mgr_.addBackend("type=postgresql");
+ }
+
+ /// @brief Creates two example database backends called "mysql" and "postgresql".
+ ///
+ /// It uses @c TestConfigBackendImpl1 and @c TestConfigBackendImpl2.
+ void addTestBackends() {
+ addTestMySQLBackend();
+ addTestPgSQLBackend();
+ }
+
+ /// @brief Adds test data into the backends.
+ void addTestData() {
+ // Add two properties with different names into the first backend.
+ config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+ BackendSelector(BackendSelector::Type::MYSQL));
+ config_mgr_.getPool()->createProperty(std::make_pair("wolves", 3),
+ BackendSelector(BackendSelector::Type::MYSQL));
+
+ // Add two properties into the second backend. Both properties share the
+ // name so as we can test retrieving multiple records from the same backend.
+ config_mgr_.getPool()->createProperty(std::make_pair("cats", 2),
+ BackendSelector(BackendSelector::Type::POSTGRESQL));
+ config_mgr_.getPool()->createProperty(std::make_pair("cats", 4),
+ BackendSelector(BackendSelector::Type::POSTGRESQL));
+ }
+
+ /// Instance of the test configuration manager.
+ TestConfigBackendMgr config_mgr_;
+};
+
+// Test that selector can be left "unspecified" if there is only one backend,
+// when manipulating the data.
+TEST_F(ConfigBackendMgrTest, createPropertySingleBackendUnspec) {
+ addTestMySQLBackend();
+
+ ASSERT_NO_THROW(
+ config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+ BackendSelector(BackendSelector::Type::UNSPEC))
+ );
+
+ // We should be able to retrieve stored value without having to specify
+ // the backend.
+ EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs"));
+}
+
+// Test that selector must be specified if there is more than one backend,
+// when manipulating the data.
+TEST_F(ConfigBackendMgrTest, createPropertyTwoBackendsUnspec) {
+ addTestBackends();
+
+ // Backend must be selected if there is more than one backend present.
+ EXPECT_THROW(
+ config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+ BackendSelector(BackendSelector::Type::UNSPEC)),
+ NoSuchDatabase
+ );
+}
+
+// Test that exception is thrown when multiple backends are selected.
+TEST_F(ConfigBackendMgrTest, createPropertyAmbiguousSelection) {
+ addTestBackends();
+
+ // Add another MySQL backend to cause the selection to give ambiguous
+ // result.
+ config_mgr_.addBackend("type=mysql");
+
+ EXPECT_THROW(
+ config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+ BackendSelector(BackendSelector::Type::MYSQL)),
+ AmbiguousDatabase
+ );
+}
+
+// Test that a single property can be retrieved from a selected backend.
+TEST_F(ConfigBackendMgrTest, getSingleProperty) {
+
+ addTestBackends();
+ addTestData();
+
+ // Backend is not specified, so it should find the dogs in first one and
+ // cats in the second one.
+ EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs"));
+ EXPECT_EQ(2, config_mgr_.getPool()->getProperty("cats"));
+
+ // No dogs in the postgresql backend and no cats in mysql backend.
+ EXPECT_EQ(0, config_mgr_.getPool()->getProperty("dogs",
+ BackendSelector(BackendSelector::Type::POSTGRESQL)));
+ EXPECT_EQ(0, config_mgr_.getPool()->getProperty("cats",
+ BackendSelector(BackendSelector::Type::MYSQL)));
+
+ // If the selectors are pointing to the right databases, the dogs and cats
+ // should be returned properly.
+ EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs",
+ BackendSelector(BackendSelector::Type::MYSQL)));
+ EXPECT_EQ(2, config_mgr_.getPool()->getProperty("cats",
+ BackendSelector(BackendSelector::Type::POSTGRESQL)));
+
+ // Also make sure that the variant of getProperty function taking two arguments
+ // would return the value.
+ EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs", 1,
+ BackendSelector(BackendSelector::Type::MYSQL)));
+
+ // If the value is not matching it should return 0.
+ EXPECT_EQ(0, config_mgr_.getPool()->getProperty("dogs", 2,
+ BackendSelector(BackendSelector::Type::MYSQL)));
+
+ // Try to use the backend that is not present.
+ EXPECT_THROW(config_mgr_.getPool()->getProperty("cats",
+ BackendSelector(static_cast<BackendSelector::Type>(-1))),
+ NoSuchDatabase);
+}
+
+// Test that multiple properties can be retrieved with filtering.
+TEST_F(ConfigBackendMgrTest, getMultipleProperties) {
+
+ addTestBackends();
+ addTestData();
+
+ // There is one dogs entry in mysql.
+ PropertiesList mysql_list =
+ config_mgr_.getPool()->getProperties("dogs",
+ BackendSelector(BackendSelector::Type::MYSQL));
+ ASSERT_EQ(1, mysql_list.size());
+
+ // There is also one wolves entry in mysql.
+ mysql_list = config_mgr_.getPool()->getProperties("wolves",
+ BackendSelector(BackendSelector::Type::MYSQL));
+ ASSERT_EQ(1, mysql_list.size());
+
+ // There are two cats entries in postgresql.
+ PropertiesList postgresql_list =
+ config_mgr_.getPool()->getProperties("cats",
+ BackendSelector(BackendSelector::Type::POSTGRESQL));
+ ASSERT_EQ(2, postgresql_list.size());
+
+ // Try to use the backend that is not present.
+ EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+ BackendSelector(static_cast<BackendSelector::Type>(-1))),
+ NoSuchDatabase);
+
+}
+
+// Test that all properties can be retrieved from each backend.
+TEST_F(ConfigBackendMgrTest, getAllProperties) {
+
+ addTestBackends();
+ addTestData();
+
+ // The mysql backend holds two entries.
+ PropertiesList mysql_list =
+ config_mgr_.getPool()->getAllProperties(BackendSelector(BackendSelector::Type::MYSQL));
+ ASSERT_EQ(2, mysql_list.size());
+
+ // The postgresql backends also holds two entries.
+ PropertiesList postgresql_list =
+ config_mgr_.getPool()->getAllProperties(BackendSelector(BackendSelector::Type::POSTGRESQL));
+ ASSERT_EQ(2, postgresql_list.size());
+
+ // Try to use the backend that is not present.
+ EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+ BackendSelector(static_cast<BackendSelector::Type>(-1))),
+ NoSuchDatabase);
+}
+
+// Verify that unregistering a factory works.
+TEST_F(ConfigBackendMgrTest, unregister) {
+
+ // Verify we can't remove what is not there.
+ ASSERT_FALSE(config_mgr_.unregisterBackendFactory("mysql"));
+
+ // Add both MySQL and Postgresql backends
+ addTestBackends();
+
+ // Backend should be present.
+ EXPECT_NO_THROW(config_mgr_.getPool()->getProperties("cats",
+ BackendSelector(BackendSelector::Type::MYSQL)));
+
+ // Verify that unregistering MySQL factory returns true.
+ ASSERT_TRUE(config_mgr_.unregisterBackendFactory("mysql"));
+
+ // Verify that the factory is actually gone.
+ ASSERT_THROW(config_mgr_.addBackend("type=mysql"), db::InvalidType);
+
+ // Verify we can't remove what is not there.
+ ASSERT_FALSE(config_mgr_.unregisterBackendFactory("mysql"));
+
+ // Try to use the backend that is not present.
+ EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+ BackendSelector(BackendSelector::Type::MYSQL)),
+ NoSuchDatabase);
+}
+
+}
diff --git a/src/lib/config_backend/tests/run_unittests.cc b/src/lib/config_backend/tests/run_unittests.cc
new file mode 100644
index 0000000..6754d66
--- /dev/null
+++ b/src/lib/config_backend/tests/run_unittests.cc
@@ -0,0 +1,19 @@
+// Copyright (C) 2018 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/.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+ ::testing::InitGoogleTest(&argc, argv);
+
+ int result = RUN_ALL_TESTS();
+
+ return (result);
+}