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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <iosfwd>
#include <memory>
#include <string>
#include <vector>
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/util/assert_util.h"
namespace mongo {
/**
* Representation of a name of a role in a MongoDB system.
*
* Consists of a "role name" part and a "datbase name" part.
*/
class RoleName {
public:
RoleName() : _splitPoint(0) {}
RoleName(StringData role, StringData dbname);
// Added for IDL support
static RoleName parseFromBSON(const BSONElement& elem);
void serializeToBSON(StringData fieldName, BSONObjBuilder* bob) const;
void serializeToBSON(BSONArrayBuilder* bob) const;
void appendToBSON(BSONObjBuilder* sub) const;
BSONObj toBSON() const;
/**
* Gets the name of the role excluding the "@dbname" component.
*/
StringData getRole() const {
return StringData(_fullName).substr(0, _splitPoint);
}
/**
* Gets the database name part of a role name.
*/
StringData getDB() const {
return StringData(_fullName).substr(_splitPoint + 1);
}
bool empty() const {
return _fullName.empty();
}
/**
* Gets the full name of a role as a string, formatted as "role@db".
*
* Allowed for keys in non-persistent data structures, such as std::map.
*/
const std::string& getFullName() const {
return _fullName;
}
/**
* Stringifies the object, for logging/debugging.
*/
const std::string& toString() const {
return getFullName();
}
template <typename H>
friend H AbslHashValue(H h, const RoleName& rname) {
return H::combine(std::move(h), rname.getFullName());
}
private:
std::string _fullName; // The full name, stored as a string. "role@db".
size_t _splitPoint; // The index of the "@" separating the role and db name parts.
};
static inline bool operator==(const RoleName& lhs, const RoleName& rhs) {
return lhs.getFullName() == rhs.getFullName();
}
static inline bool operator!=(const RoleName& lhs, const RoleName& rhs) {
return lhs.getFullName() != rhs.getFullName();
}
static inline bool operator<(const RoleName& lhs, const RoleName& rhs) {
if (lhs.getDB() == rhs.getDB()) {
return lhs.getRole() < rhs.getRole();
}
return lhs.getDB() < rhs.getDB();
}
std::ostream& operator<<(std::ostream& os, const RoleName& name);
/**
* Iterator over an unspecified container of RoleName objects.
*/
class RoleNameIterator {
public:
class Impl {
Impl(const Impl&) = delete;
Impl& operator=(const Impl&) = delete;
public:
Impl(){};
virtual ~Impl(){};
static Impl* clone(Impl* orig) {
return orig ? orig->doClone() : nullptr;
}
virtual bool more() const = 0;
virtual const RoleName& get() const = 0;
virtual const RoleName& next() = 0;
private:
virtual Impl* doClone() const = 0;
};
RoleNameIterator() : _impl(nullptr) {}
RoleNameIterator(const RoleNameIterator& other) : _impl(Impl::clone(other._impl.get())) {}
explicit RoleNameIterator(Impl* impl) : _impl(impl) {}
RoleNameIterator& operator=(const RoleNameIterator& other) {
_impl.reset(Impl::clone(other._impl.get()));
return *this;
}
bool more() const {
return _impl.get() && _impl->more();
}
const RoleName& get() const {
return _impl->get();
}
const RoleName& next() {
return _impl->next();
}
const RoleName& operator*() const {
return get();
}
const RoleName* operator->() const {
return &get();
}
private:
std::unique_ptr<Impl> _impl;
};
} // namespace mongo
namespace mongo {
template <typename ContainerIterator>
class RoleNameContainerIteratorImpl : public RoleNameIterator::Impl {
RoleNameContainerIteratorImpl(const RoleNameContainerIteratorImpl&) = delete;
RoleNameContainerIteratorImpl& operator=(const RoleNameContainerIteratorImpl&) = delete;
public:
RoleNameContainerIteratorImpl(const ContainerIterator& begin, const ContainerIterator& end)
: _curr(begin), _end(end) {}
virtual ~RoleNameContainerIteratorImpl() {}
virtual bool more() const {
return _curr != _end;
}
virtual const RoleName& next() {
return *(_curr++);
}
virtual const RoleName& get() const {
return *_curr;
}
virtual RoleNameIterator::Impl* doClone() const {
return new RoleNameContainerIteratorImpl(_curr, _end);
}
private:
ContainerIterator _curr;
ContainerIterator _end;
};
template <typename ContainerIterator>
RoleNameIterator makeRoleNameIterator(const ContainerIterator& begin,
const ContainerIterator& end) {
return RoleNameIterator(new RoleNameContainerIteratorImpl<ContainerIterator>(begin, end));
}
template <typename Container>
RoleNameIterator makeRoleNameIteratorForContainer(const Container& container) {
return makeRoleNameIterator(container.begin(), container.end());
}
template <typename Container>
Container roleNameIteratorToContainer(RoleNameIterator it) {
Container container;
while (it.more()) {
container.emplace_back(it.next());
}
return container;
}
} // namespace mongo
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