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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "AclResourceCounter.h"
#include "Acl.h"
#include "qpid/log/Statement.h"
#include "qpid/sys/Mutex.h"
#include <assert.h>
#include <sstream>
using namespace qpid::sys;
namespace qpid {
namespace acl {
//
// This module approves various resource creation requests:
// Queues
//
//
//
//
ResourceCounter::ResourceCounter(Acl& a, uint16_t ql) :
acl(a), queueLimit(ql) {}
ResourceCounter::~ResourceCounter() {}
//
// limitApproveLH
//
// Resource creation approver.
// If user is under limit increment count and return true.
// Called with lock held.
//
bool ResourceCounter::limitApproveLH(
countsMap_t& theMap,
const std::string& theName,
uint16_t theLimit,
bool emitLog,
bool enforceLimit) {
bool result(true);
uint16_t count;
countsMap_t::iterator eRef = theMap.find(theName);
if (eRef != theMap.end()) {
count = (uint16_t)(*eRef).second;
result = (enforceLimit ? count < theLimit : true);
if (result) {
count += 1;
(*eRef).second = count;
}
} else {
// user not found in map
if (enforceLimit) {
if (theLimit > 0) {
theMap[theName] = count = 1;
} else {
count = 0;
result = false;
}
}
else {
// not enforcing the limit
theMap[theName] = count = 1;
}
}
if (emitLog) {
QPID_LOG(trace, "ACL QueueApprover user=" << theName
<< " limit=" << theLimit
<< " curValue=" << count
<< " result=" << (result ? "allow" : "deny"));
}
return result;
}
//
// releaseLH
//
// Decrement the name's count in map.
// called with dataLock already taken
//
void ResourceCounter::releaseLH(countsMap_t& theMap, const std::string& theName) {
countsMap_t::iterator eRef = theMap.find(theName);
if (eRef != theMap.end()) {
uint16_t count = (uint16_t) (*eRef).second;
assert (count > 0);
if (1 == count) {
theMap.erase (eRef);
} else {
(*eRef).second = count - 1;
}
} else {
// User had no connections.
QPID_LOG(notice, "ACL resource counter: Queue owner for queue '" << theName
<< "' not found in resource count pool");
}
}
//
// approveCreateQueue
// Count an attempted queue creation by this user.
// Disapprove if over limit.
//
bool ResourceCounter::approveCreateQueue(const std::string& userId,
const std::string& queueName,
bool enforcingQueueQuotas,
uint16_t queueUserQuota )
{
Mutex::ScopedLock locker(dataLock);
bool okByQ = limitApproveLH(queuePerUserMap, userId, queueUserQuota, true, enforcingQueueQuotas);
if (okByQ) {
// Queue is owned by this userId
queueOwnerMap[queueName] = userId;
QPID_LOG(trace, "ACL create queue approved for user '" << userId
<< "' queue '" << queueName << "'");
} else {
QPID_LOG(error, "Client max queue count limit of " << queueUserQuota
<< " exceeded by '" << userId << "' creating queue '"
<< queueName << "'. Queue creation denied.");
acl.reportQueueLimit(userId, queueName);
}
return okByQ;
}
//
// recordDestroyQueue
// Return a destroyed queue to a user's quota
//
void ResourceCounter::recordDestroyQueue(const std::string& queueName)
{
Mutex::ScopedLock locker(dataLock);
queueOwnerMap_t::iterator eRef = queueOwnerMap.find(queueName);
if (eRef != queueOwnerMap.end()) {
releaseLH(queuePerUserMap, (*eRef).second);
queueOwnerMap.erase(eRef);
} else {
QPID_LOG(notice, "ACL resource counter: Queue '" << queueName
<< "' not found in queue owner map");
}
}
}} // namespace qpid::acl
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