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// Copyright (C) 2013-2018 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 <hooks/callout_handle.h>
#include <hooks/callout_manager.h>
#include <hooks/callout_manager.h>
#include <hooks/library_handle.h>
#include <hooks/library_manager_collection.h>
#include <hooks/hooks_manager.h>
#include <hooks/server_hooks.h>
#include <boost/shared_ptr.hpp>
#include <string>
#include <vector>
using namespace std;
namespace isc {
namespace hooks {
// Constructor
HooksManager::HooksManager() {
}
// Return reference to singleton hooks manager.
HooksManager&
HooksManager::getHooksManager() {
static HooksManager manager;
return (manager);
}
// Are callouts present?
bool
HooksManager::calloutsPresentInternal(int index) {
conditionallyInitialize();
return (callout_manager_->calloutsPresent(index));
}
bool
HooksManager::calloutsPresent(int index) {
return (getHooksManager().calloutsPresentInternal(index));
}
bool
HooksManager::commandHandlersPresentInternal(const std::string& command_name) {
conditionallyInitialize();
return (callout_manager_->commandHandlersPresent(command_name));
}
bool
HooksManager::commandHandlersPresent(const std::string& command_name) {
return (getHooksManager().commandHandlersPresentInternal(command_name));
}
// Call the callouts
void
HooksManager::callCalloutsInternal(int index, CalloutHandle& handle) {
conditionallyInitialize();
callout_manager_->callCallouts(index, handle);
}
void
HooksManager::callCallouts(int index, CalloutHandle& handle) {
getHooksManager().callCalloutsInternal(index, handle);
}
void
HooksManager::callCommandHandlersInternal(const std::string& command_name,
CalloutHandle& handle) {
conditionallyInitialize();
callout_manager_->callCommandHandlers(command_name, handle);
}
void
HooksManager::callCommandHandlers(const std::string& command_name,
CalloutHandle& handle) {
getHooksManager().callCommandHandlersInternal(command_name, handle);
}
// Load the libraries. This will delete the previously-loaded libraries
// (if present) and load new ones.
bool
HooksManager::loadLibrariesInternal(const HookLibsCollection& libraries) {
// Unload current set of libraries (if any are loaded).
unloadLibrariesInternal();
// Create the library manager and load the libraries.
lm_collection_.reset(new LibraryManagerCollection(libraries));
bool status = lm_collection_->loadLibraries();
if (status) {
// ... and obtain the callout manager for them if successful.
callout_manager_ = lm_collection_->getCalloutManager();
} else {
// Unable to load libraries, reset to state before this function was
// called.
lm_collection_.reset();
callout_manager_.reset();
}
return (status);
}
bool
HooksManager::loadLibraries(const HookLibsCollection& libraries) {
return (getHooksManager().loadLibrariesInternal(libraries));
}
// Unload the libraries. This just deletes all internal objects which will
// cause the libraries to be unloaded.
void
HooksManager::unloadLibrariesInternal() {
// The order of deletion does not matter here, as each library manager
// holds its own pointer to the callout manager. However, we may as
// well delete the library managers first: if there are no other references
// to the callout manager, the second statement will delete it, which may
// ease debugging.
lm_collection_.reset();
callout_manager_.reset();
ServerHooks::getServerHooks().getParkingLotsPtr()->clear();
}
void HooksManager::unloadLibraries() {
getHooksManager().unloadLibrariesInternal();
}
// Create a callout handle
boost::shared_ptr<CalloutHandle>
HooksManager::createCalloutHandleInternal() {
conditionallyInitialize();
return (boost::shared_ptr<CalloutHandle>(
new CalloutHandle(callout_manager_, lm_collection_)));
}
boost::shared_ptr<CalloutHandle>
HooksManager::createCalloutHandle() {
return (getHooksManager().createCalloutHandleInternal());
}
// Get the list of the names of loaded libraries.
std::vector<std::string>
HooksManager::getLibraryNamesInternal() const {
return (lm_collection_ ? lm_collection_->getLibraryNames()
: std::vector<std::string>());
}
HookLibsCollection
HooksManager::getLibraryInfoInternal() const {
return (lm_collection_ ? lm_collection_->getLibraryInfo()
: HookLibsCollection());
}
std::vector<std::string>
HooksManager::getLibraryNames() {
return (getHooksManager().getLibraryNamesInternal());
}
HookLibsCollection
HooksManager::getLibraryInfo() {
return (getHooksManager().getLibraryInfoInternal());
}
// Perform conditional initialization if nothing is loaded.
void
HooksManager::performConditionalInitialization() {
// Nothing present, so create the collection with any empty set of
// libraries, and get the CalloutManager.
HookLibsCollection libraries;
lm_collection_.reset(new LibraryManagerCollection(libraries));
lm_collection_->loadLibraries();
callout_manager_ = lm_collection_->getCalloutManager();
}
// Shell around ServerHooks::registerHook()
int
HooksManager::registerHook(const std::string& name) {
return (ServerHooks::getServerHooks().registerHook(name));
}
// Return pre- and post- library handles.
isc::hooks::LibraryHandle&
HooksManager::preCalloutsLibraryHandleInternal() {
conditionallyInitialize();
return (callout_manager_->getPreLibraryHandle());
}
isc::hooks::LibraryHandle&
HooksManager::preCalloutsLibraryHandle() {
return (getHooksManager().preCalloutsLibraryHandleInternal());
}
isc::hooks::LibraryHandle&
HooksManager::postCalloutsLibraryHandleInternal() {
conditionallyInitialize();
return (callout_manager_->getPostLibraryHandle());
}
isc::hooks::LibraryHandle&
HooksManager::postCalloutsLibraryHandle() {
return (getHooksManager().postCalloutsLibraryHandleInternal());
}
// Validate libraries
std::vector<std::string>
HooksManager::validateLibraries(const std::vector<std::string>& libraries) {
return (LibraryManagerCollection::validateLibraries(libraries));
}
// Shared callout manager
boost::shared_ptr<CalloutManager>&
HooksManager::getSharedCalloutManager() {
return (getHooksManager().shared_callout_manager_);
}
} // namespace util
} // namespace isc
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