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// Copyright (C) 2015-2024 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 <dhcpsrv/dhcpsrv_log.h>
#include <dhcpsrv/host_data_source_factory.h>
#include <dhcpsrv/hosts_log.h>
#include <log/logger_support.h>
#ifdef HAVE_MYSQL
#include <dhcpsrv/mysql_host_data_source.h>
#endif
#ifdef HAVE_PGSQL
#include <dhcpsrv/pgsql_host_data_source.h>
#endif
#include <boost/algorithm/string.hpp>
#include <algorithm>
#include <iostream>
#include <iterator>
#include <map>
#include <sstream>
#include <utility>
using namespace isc::db;
using namespace std;
namespace isc {
namespace dhcp {
map<string, HostDataSourceFactory::Factory> HostDataSourceFactory::map_;
void
HostDataSourceFactory::add(HostDataSourceList& sources,
const string& dbaccess) {
// Parse the access string and create a redacted string for logging.
DatabaseConnection::ParameterMap parameters =
DatabaseConnection::parse(dbaccess);
// Get the database type and open the corresponding database
DatabaseConnection::ParameterMap::iterator it = parameters.find("type");
if (it == parameters.end()) {
isc_throw(InvalidParameter, "Host database configuration does not "
"contain the 'type' keyword");
}
string db_type = it->second;
auto index = map_.find(db_type);
// No match?
if (index == map_.end()) {
if ((db_type == "mysql") ||
(db_type == "postgresql")) {
string with = (db_type == "postgresql" ? "pgsql" : db_type);
isc_throw(InvalidType, "The type of host backend: '" << db_type
<< "' is not compiled in. Did you forget to use --with-"
<< with << " during compilation?");
}
isc_throw(InvalidType, "The type of host backend: '" <<
db_type << "' is not supported");
}
// Call the factory and push the pointer on sources.
sources.push_back(index->second(parameters));
// Check the factory did not return NULL.
if (!sources.back()) {
sources.pop_back();
isc_throw(Unexpected, "Hosts database " << db_type <<
" factory returned NULL");
}
}
bool
HostDataSourceFactory::del(HostDataSourceList& sources,
const string& db_type) {
for (auto it = sources.begin(); it != sources.end(); ++it) {
if ((*it)->getType() != db_type) {
continue;
}
LOG_DEBUG(hosts_logger, DHCPSRV_DBG_TRACE, HOSTS_CFG_CLOSE_HOST_DATA_SOURCE)
.arg(db_type);
sources.erase(it);
return (true);
}
return (false);
}
bool
HostDataSourceFactory::del(HostDataSourceList& sources,
const string& db_type,
const string& dbaccess,
bool if_unusable) {
DatabaseConnection::ParameterMap parameters =
DatabaseConnection::parse(dbaccess);
bool deleted = false;
if (if_unusable) {
deleted = true;
}
for (auto it = sources.begin(); it != sources.end(); ++it) {
if ((*it)->getType() != db_type || (*it)->getParameters() != parameters) {
continue;
}
if (if_unusable && (!(*it)->isUnusable())) {
deleted = false;
continue;
}
LOG_DEBUG(hosts_logger, DHCPSRV_DBG_TRACE, HOSTS_CFG_CLOSE_HOST_DATA_SOURCE)
.arg((*it)->getType());
sources.erase(it);
return (true);
}
return (deleted);
}
bool
HostDataSourceFactory::registerFactory(const string& db_type,
const Factory& factory,
bool no_log) {
if (map_.count(db_type)) {
return (false);
}
map_.insert(pair<string, Factory>(db_type, factory));
// We are dealing here with static logger initialization fiasco.
// registerFactory may be called from constructors of static global
// objects for built in backends. The logging is not initialized yet,
// so the LOG_DEBUG would throw.
if (!no_log) {
LOG_DEBUG(hosts_logger, DHCPSRV_DBG_TRACE, HOSTS_BACKEND_REGISTER)
.arg(db_type);
}
return (true);
}
bool
HostDataSourceFactory::deregisterFactory(const string& db_type, bool no_log) {
auto index = map_.find(db_type);
if (index != map_.end()) {
map_.erase(index);
if (!no_log) {
LOG_DEBUG(hosts_logger, DHCPSRV_DBG_TRACE,
HOSTS_BACKEND_DEREGISTER)
.arg(db_type);
}
return (true);
} else {
return (false);
}
}
bool
HostDataSourceFactory::registeredFactory(const std::string& db_type) {
auto index = map_.find(db_type);
return (index != map_.end());
}
void
HostDataSourceFactory::printRegistered() {
std::stringstream txt;
for (auto const& x : map_) {
txt << x.first << " ";
}
LOG_INFO(hosts_logger, HOSTS_BACKENDS_REGISTERED).arg(txt.str());
}
} // namespace dhcp
} // namespace isc
//
// Register database backends
//
using namespace isc::dhcp;
namespace {
#ifdef HAVE_MYSQL
struct MySqlHostDataSourceInit {
// Constructor registers
MySqlHostDataSourceInit() {
HostDataSourceFactory::registerFactory("mysql", factory, true);
}
// Destructor deregisters
~MySqlHostDataSourceInit() {
HostDataSourceFactory::deregisterFactory("mysql", true);
}
// Factory class method
static HostDataSourcePtr
factory(const DatabaseConnection::ParameterMap& parameters) {
LOG_INFO(hosts_logger, DHCPSRV_MYSQL_HOST_DB)
.arg(DatabaseConnection::redactedAccessString(parameters));
return (HostDataSourcePtr(new MySqlHostDataSource(parameters)));
}
};
// Database backend will be registered at object initialization
MySqlHostDataSourceInit mysql_init_;
#endif
#ifdef HAVE_PGSQL
struct PgSqlHostDataSourceInit {
// Constructor registers
PgSqlHostDataSourceInit() {
HostDataSourceFactory::registerFactory("postgresql", factory, true);
}
// Destructor deregisters
~PgSqlHostDataSourceInit() {
HostDataSourceFactory::deregisterFactory("postgresql", true);
}
// Factory class method
static HostDataSourcePtr
factory(const DatabaseConnection::ParameterMap& parameters) {
LOG_INFO(hosts_logger, DHCPSRV_PGSQL_HOST_DB)
.arg(DatabaseConnection::redactedAccessString(parameters));
return (HostDataSourcePtr(new PgSqlHostDataSource(parameters)));
}
};
// Database backend will be registered at object initialization
PgSqlHostDataSourceInit pgsql_init_;
#endif
} // end of anonymous namespace
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