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// Copyright (C) 2020 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/resource_handler.h>
#include <exceptions/exceptions.h>
using namespace std;
using namespace isc::asiolink;
using namespace isc::util;
namespace isc {
namespace dhcp {
mutex ResourceHandler::mutex_;
ResourceHandler::ResourceContainer ResourceHandler::resources_;
ResourceHandler::ResourceHandler() : owned_() {
}
ResourceHandler::~ResourceHandler() {
lock_guard<mutex> lock_(mutex_);
for (auto res : owned_) {
unLockInternal(res->type_, res->addr_);
}
owned_.clear();
}
ResourceHandler::ResourcePtr
ResourceHandler::lookup(Lease::Type type, const asiolink::IOAddress& addr) {
auto key = boost::make_tuple(type, addr.toBytes());
auto it = resources_.find(key);
if (it == resources_.end()) {
return (ResourcePtr());
}
return (*it);
}
void
ResourceHandler::lock(Lease::Type type, const asiolink::IOAddress& addr) {
ResourcePtr res(new Resource(type, addr));
// Assume insert will never fail so not checking its result.
resources_.insert(res);
owned_.insert(res);
}
void
ResourceHandler::unLockInternal(Lease::Type type,
const asiolink::IOAddress& addr) {
auto key = boost::make_tuple(type, addr.toBytes());
auto it = resources_.find(key);
if (it == resources_.end()) {
return;
}
resources_.erase(it);
}
bool
ResourceHandler::tryLock(Lease::Type type, const asiolink::IOAddress& addr) {
ResourcePtr holder;
// Try to acquire the lock and return the holder when it failed.
lock_guard<mutex> lock_(mutex_);
holder = lookup(type, addr);
if (holder) {
return (false);
}
lock(type, addr);
return (true);
}
bool
ResourceHandler::isLocked(Lease::Type type, const asiolink::IOAddress& addr) {
auto key = boost::make_tuple(type, addr.toBytes());
lock_guard<mutex> lock_(mutex_);
auto it = owned_.find(key);
return (it != owned_.end());
}
void
ResourceHandler::unLock(Lease::Type type, const asiolink::IOAddress& addr) {
auto key = boost::make_tuple(type, addr.toBytes());
lock_guard<mutex> lock_(mutex_);
auto it = owned_.find(key);
if (it == owned_.end()) {
isc_throw(NotFound, "does not own " << Lease::typeToText(type)
<< " " << addr.toText());
}
unLockInternal(type, addr);
owned_.erase(it);
}
} // namespace dhcp
} // namespace isc
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