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385 lines
8.7 KiB
385 lines
8.7 KiB
#pragma once
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#include <stddef.h>
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#include "gp_config.hpp"
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#include "gp/variant.hpp"
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#include "gp/optional.hpp"
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#include "gp/buffer.hpp"
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#include "gp/allocator/aggregator.hpp"
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namespace gp {
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class vfs {
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public:
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struct bad_file final {
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static constexpr auto _what = "bad_file";
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constexpr auto what() {
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return _what;
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}
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};
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struct faulty_buffer final {
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static constexpr auto _what = "faulty_buffer";
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constexpr auto what() {
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return _what;
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}
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};
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struct interrupted final {
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static constexpr auto _what = "interrupted";
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constexpr auto what() {
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return _what;
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}
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};
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struct io_error final {
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static constexpr auto _what = "io_error";
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constexpr auto what() {
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return _what;
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}
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};
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struct is_directory final {
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static constexpr auto _what = "is_directory";
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constexpr auto what() {
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return _what;
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}
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};
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struct try_again final {
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static constexpr auto _what = "try_again";
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constexpr auto what() {
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return _what;
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}
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};
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struct not_connected final {
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static constexpr auto _what = "not_connected";
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constexpr auto what() {
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return _what;
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}
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};
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struct impossible_io final {
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static constexpr auto _what = "impossible_io";
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constexpr auto what() {
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return _what;
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}
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};
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struct negative_offset final {
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static constexpr auto _what = "negative_offset";
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constexpr auto what() {
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return _what;
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}
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};
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struct is_pipe final {
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static constexpr auto _what = "is_pipe";
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constexpr auto what() {
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return _what;
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}
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};
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struct buffer_too_big final {
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static constexpr auto _what = "buffer_too_big";
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constexpr auto what() {
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return _what;
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}
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};
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struct path_not_directory final {
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static constexpr auto _what = "path_not_directory";
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constexpr auto what() {
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return _what;
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}
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};
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struct name_too_long final {
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static constexpr auto _what = "name_too_long";
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constexpr auto what() {
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return _what;
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}
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};
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struct does_not_exist final {
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static constexpr auto _what = "does_not_exist";
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constexpr auto what() {
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return _what;
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}
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};
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struct may_loop final {
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static constexpr auto _what = "may_loop";
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constexpr auto what() {
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return _what;
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}
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};
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struct invalid_flags final {
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static constexpr auto _what = "invalid_flags";
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constexpr auto what() {
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return _what;
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}
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};
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struct is_read_only final {
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static constexpr auto _what = "is_read_only";
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constexpr auto what() {
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return _what;
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}
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};
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struct fd_limit_reached final {
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static constexpr auto _what = "fd_limit_reached";
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constexpr auto what() {
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return _what;
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}
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};
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struct file_limit_reached final {
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static constexpr auto _what = "file_limit_reached";
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constexpr auto what() {
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return _what;
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}
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};
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struct no_locking final {
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static constexpr auto _what = "no_locking";
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constexpr auto what() {
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return _what;
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}
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};
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struct would_block final {
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static constexpr auto _what = "would_block";
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constexpr auto what() {
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return _what;
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}
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};
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struct no_inodes final {
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static constexpr auto _what = "no_inodes";
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constexpr auto what() {
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return _what;
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}
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};
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struct no_space final {
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static constexpr auto _what = "no_space";
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constexpr auto what() {
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return _what;
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}
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};
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struct quota_reached final {
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static constexpr auto _what = "quota_reached";
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constexpr auto what() {
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return _what;
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}
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};
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struct cannot_write_shared_text final {
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static constexpr auto _what = "cannot_write_shared_text";
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constexpr auto what() {
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return _what;
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}
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};
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struct faulty_filename final {
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static constexpr auto _what = "faulty_filename";
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constexpr auto what() {
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return _what;
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}
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};
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struct exists_already final {
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static constexpr auto _what = "exists_already";
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constexpr auto what() {
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return _what;
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}
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};
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struct is_append_only final {
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static constexpr auto _what = "is_append_only";
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constexpr auto what() {
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return _what;
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}
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};
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struct unimplemented_operation final {
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static constexpr auto _what = "unimplemented_operation";
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constexpr auto what() {
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return _what;
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}
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};
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struct is_busy final {
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static constexpr auto _what = "is_busy";
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constexpr auto what() {
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return _what;
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}
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};
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struct bad_relative_path final {
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static constexpr auto _what = "bad_relative_path";
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constexpr auto what() {
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return _what;
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}
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};
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struct no_permissions final {
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static constexpr auto _what = "no_permissions";
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constexpr auto what() {
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return _what;
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}
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};
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struct success final {
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static constexpr auto _what = "success";
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constexpr auto what() {
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return _what;
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}
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};
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struct too_big final {
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static constexpr auto _what = "too_big";
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constexpr auto what() {
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return _what;
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}
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};
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struct network_down final {
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static constexpr auto _what = "network_down";
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constexpr auto what() {
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return _what;
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}
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};
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struct destination_not_available final {
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static constexpr auto _what = "destination_not_available";
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constexpr auto what() {
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return _what;
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}
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};
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struct insufficient_buffer_space final {
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static constexpr auto _what = "insufficient_buffer_space";
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constexpr auto what() {
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return _what;
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}
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};
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using read_return = gp::fixed_variant<
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typename buffer<char>::associated_iterator, // iterator to last element read
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bad_file,
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faulty_buffer,
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interrupted,
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io_error,
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is_directory,
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try_again,
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not_connected,
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impossible_io,
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negative_offset,
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is_pipe,
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buffer_too_big
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>;
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using open_return = gp::fixed_variant<
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gp_config::file_descriptor_t,
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path_not_directory,
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name_too_long,
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does_not_exist,
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may_loop,
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is_directory,
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invalid_flags,
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is_read_only,
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fd_limit_reached,
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file_limit_reached,
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impossible_io,
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interrupted,
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no_locking,
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would_block,
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no_space,
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no_inodes,
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quota_reached,
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io_error,
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cannot_write_shared_text,
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faulty_filename,
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exists_already,
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is_append_only,
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unimplemented_operation,
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is_busy,
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bad_relative_path,
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no_permissions
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>;
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using close_return = gp::fixed_variant<
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success,
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bad_file,
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interrupted,
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io_error
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>;
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using write_return = gp::fixed_variant<
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typename buffer<char>::associated_iterator,
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bad_file,
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no_space,
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quota_reached,
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too_big,
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interrupted,
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io_error,
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faulty_buffer,
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is_pipe,
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try_again,
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network_down,
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destination_not_available,
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impossible_io,
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buffer_too_big,
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negative_offset,
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insufficient_buffer_space
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>;
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class file_flags{};
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class file_permissions{};
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private:
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struct virtual_fs
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{
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virtual ~virtual_fs() = default;
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virtual open_return open(buffer<char>, file_flags, file_permissions) = 0;
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virtual read_return read(gp_config::file_descriptor_t, buffer<char>) = 0;
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virtual write_return write(gp_config::file_descriptor_t, buffer<char>, size_t) = 0;
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virtual close_return close(gp_config::file_descriptor_t) = 0;
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};
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template<typename concrete>
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class abstract_fs final : public virtual_fs{
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concrete internal_representation;
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public:
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abstract_fs(abstract_fs& v) = delete;
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abstract_fs(abstract_fs&& v)
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: internal_representation{v.internal_representation}
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{}
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abstract_fs(concrete& v) = delete;
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abstract_fs(concrete&& v)
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: internal_representation{v}
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{}
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virtual ~abstract_fs() override = default;
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virtual open_return open(buffer<char> path, file_flags flags, file_permissions perms) override {
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return internal_representation.open(path, flags, perms);
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}
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virtual read_return read(gp_config::file_descriptor_t fd, buffer<char> buff) override {
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return internal_representation.read(fd, buff);
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}
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virtual write_return write(gp_config::file_descriptor_t fd, buffer<char> buff, size_t offset) override {
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return internal_representation.write(fd, buff, offset);
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}
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virtual close_return close(gp_config::file_descriptor_t fd) override {
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return internal_representation.close(fd);
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}
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};
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reference_wrapper<aggregator> allocator;
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virtual_fs* file_system;
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public:
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template<typename T>
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vfs(T&& v, reference_wrapper<aggregator> _ref)
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: allocator{_ref}
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, file_system{new(allocator.get().allocate(sizeof(T))) T(gp::move(v))}
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{}
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open_return open(buffer<char> path, file_flags flags, file_permissions perms) {
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return file_system->open(path, flags, perms);
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}
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read_return read(gp_config::file_descriptor_t fd, buffer<char> buff) {
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return file_system->read(fd, buff);
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}
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write_return write(gp_config::file_descriptor_t fd, buffer<char> buff, size_t offset) {
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return file_system->write(fd, buff, offset);
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}
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close_return close(gp_config::file_descriptor_t fd) {
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return file_system->close(fd);
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}
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~vfs() {
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file_system->~virtual_fs();
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allocator.get().deallocate(file_system);
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}
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};
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}
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