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// Copyright (C) 2019 The Android Open Source Project
//
// 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.
#ifndef IORAP_SRC_INODE2FILENAME_DATA_SOURCE_H_
#define IORAP_SRC_INODE2FILENAME_DATA_SOURCE_H_
#include "inode2filename/inode_result.h"
#include "inode2filename/system_call.h"
#include <rxcpp/rx.hpp>
#include <memory>
#include <optional>
#include <string>
#include <vector>
namespace iorap::inode2filename {
enum class DataSourceKind {
kDiskScan,
kTextCache,
kBpf,
};
std::vector<std::string> ToArgs(DataSourceKind data_source_kind);
struct DataSourceDependencies {
DataSourceKind data_source = DataSourceKind::kDiskScan;
borrowed<SystemCall*> system_call = nullptr;
// kDiskScan-specific options. Other data sources ignore these fields.
std::vector<std::string> root_directories;
// kTextCache-specific options. Other data sources ignore these fields.
std::optional<std::string> text_cache_filename;
};
std::vector<std::string> ToArgs(const DataSourceDependencies& deps);
class DataSource : std::enable_shared_from_this<DataSource> {
public:
static std::shared_ptr<DataSource> Create(DataSourceDependencies dependencies);
virtual void StartRecording(); // XX: feels like this should be BPF-specific.
virtual void StopRecording();
// Emit all inode->filename mappings (i.e. an infinite lazy list).
// The specific order is determined by the extra dependency options.
//
// The work must terminate if all subscriptions are removed.
virtual rxcpp::observable<InodeResult> EmitInodes() const = 0;
// Does the InodeResult include a valid device number?
// If returning false, the InodeResolver fills in the missing device number with stat(2).
virtual bool ResultIncludesDeviceNumber() const { return true; };
protected:
virtual ~DataSource() {}
DataSource(DataSourceDependencies dependencies);
DataSourceDependencies dependencies_;
};
} // namespace iorap::inode2filename
#endif // IORAP_SRC_INODE2FILENAME_DATA_SOURCE_H_
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