operations_file.hpp

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#pragma once
 
/// @file userver/dump/operations_file.hpp
/// @brief File-based dump Reader and Writer implementations
 
#include <chrono>
 
#include <boost/filesystem/operations.hpp>
 
#include <userver/fs/blocking/c_file.hpp>
#include <userver/utils/cpu_relax.hpp>
#include <userver/utils/fast_pimpl.hpp>
 
#include <userver/dump/factory.hpp>
#include <userver/dump/operations.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace dump {
 
/// A handle to a dump file. File operations block the thread.
class FileWriter final : public Writer {
public:
    /// @brief Creates a new dump file and opens it
    /// @throws `Error` on a filesystem error
    explicit FileWriter(std::string path, boost::filesystem::perms perms, tracing::ScopeTime& scope);
 
    void Finish() override;
 
private:
    void WriteRaw(std::string_view data) override;
 
    fs::blocking::CFile file_;
    std::string final_path_;
    std::string path_;
    boost::filesystem::perms perms_;
    utils::StreamingCpuRelax cpu_relax_;
};
 
/// A handle to a dump file. File operations block the thread.
class FileReader final : public Reader {
public:
    /// @brief Opens an existing dump file
    /// @throws `Error` on a filesystem error
    explicit FileReader(std::string path);
 
    void Finish() override;
 
private:
    std::string_view ReadRaw(std::size_t max_size) override;
 
    void BackUp(std::size_t size) override;
 
    fs::blocking::CFile file_;
    std::string path_;
    std::string curr_chunk_;
};
 
class FileOperationsFactory final : public OperationsFactory {
public:
    explicit FileOperationsFactory(boost::filesystem::perms perms);
 
    std::unique_ptr<Reader> CreateReader(std::string full_path) override;
 
    std::unique_ptr<Writer> CreateWriter(std::string full_path, tracing::ScopeTime& scope) override;
 
private:
    const boost::filesystem::perms perms_;
};
 
}  // namespace dump
 
USERVER_NAMESPACE_END