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/*
* Copyright (c) 2017 VMware, Inc.
*
* Licensed 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.
*/
#pragma once
#include <cstddef>
#include <iterator>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "table_desc.h"
namespace ebpf {
class TableStorageImpl;
class TableStorageIteratorImpl;
class Path {
public:
static const std::string DELIM;
Path() = default;
Path(const Path &other) = default;
Path &operator=(const Path &other) = default;
Path(std::initializer_list<std::string> parts) {
size_t len = parts.size() * DELIM.size();
for (const auto &s : parts)
len += s.size();
path_.reserve(len);
for (const auto &s : parts)
path_ += DELIM + s;
}
const std::string &to_string() const { return path_; }
private:
std::string path_;
};
class TableStorage {
public:
/// iterator is an abstract class for traversing the map entries in a table
/// storage object.
class iterator {
private:
friend class TableStorage;
iterator(const iterator &);
public:
typedef std::pair<const std::string, TableDesc> value_type;
typedef std::ptrdiff_t difference_type;
typedef value_type *pointer;
typedef value_type &reference;
typedef std::forward_iterator_tag iterator_category;
typedef iterator self_type;
iterator();
iterator(std::unique_ptr<TableStorageIteratorImpl>);
~iterator();
iterator(iterator &&);
iterator &operator=(iterator &&);
self_type &operator++();
self_type operator++(int);
bool operator==(const self_type &) const;
bool operator!=(const self_type &) const;
value_type &operator*() const;
pointer operator->() const;
private:
std::unique_ptr<TableStorageIteratorImpl> impl_;
};
TableStorage();
~TableStorage();
void Init(std::unique_ptr<TableStorageImpl>);
bool Find(const Path &path, TableStorage::iterator &result) const;
bool Insert(const Path &path, TableDesc &&desc);
bool Delete(const Path &path);
size_t DeletePrefix(const Path &path);
void AddMapTypesVisitor(std::unique_ptr<MapTypesVisitor>);
void VisitMapType(TableDesc &desc, clang::ASTContext &C, clang::QualType key_type,
clang::QualType leaf_type);
iterator begin();
iterator end();
iterator lower_bound(const Path &p);
iterator upper_bound(const Path &p);
private:
std::unique_ptr<TableStorageImpl> impl_;
std::vector<std::unique_ptr<MapTypesVisitor>> visitors_;
};
std::unique_ptr<TableStorage> createSharedTableStorage();
std::unique_ptr<TableStorage> createBpfFsTableStorage();
}
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