515 lines
13 KiB
C++
515 lines
13 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#include "td/utils/logging.h"
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#include "td/utils/ScopeGuard.h"
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#include "td/utils/Slice.h"
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#include "td/utils/StackAllocator.h"
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#include "td/utils/StringBuilder.h"
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#include <cerrno>
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#include <cstring>
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#include <memory>
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#include <new>
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#include <type_traits>
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#include <utility>
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#define TRY_STATUS(status) \
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{ \
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auto try_status = (status); \
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if (try_status.is_error()) { \
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return try_status.move_as_error(); \
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} \
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}
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#define TRY_STATUS_PREFIX(status, prefix) \
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{ \
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auto try_status = (status); \
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if (try_status.is_error()) { \
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return try_status.move_as_error_prefix(prefix); \
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} \
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}
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#define TRY_RESULT(name, result) TRY_RESULT_IMPL(TD_CONCAT(TD_CONCAT(r_, name), __LINE__), name, result)
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#define TRY_RESULT_PREFIX(name, result, prefix) \
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TRY_RESULT_PREFIX_IMPL(TD_CONCAT(TD_CONCAT(r_, name), __LINE__), name, result, prefix)
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#define TRY_RESULT_IMPL(r_name, name, result) \
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auto r_name = (result); \
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if (r_name.is_error()) { \
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return r_name.move_as_error(); \
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} \
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auto name = r_name.move_as_ok();
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#define TRY_RESULT_PREFIX_IMPL(r_name, name, result, prefix) \
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auto r_name = (result); \
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if (r_name.is_error()) { \
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return r_name.move_as_error_prefix(prefix); \
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} \
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auto name = r_name.move_as_ok();
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#define LOG_STATUS(status) \
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{ \
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auto log_status = (status); \
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if (log_status.is_error()) { \
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LOG(ERROR) << log_status.move_as_error(); \
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} \
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}
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#ifndef TD_STATUS_NO_ENSURE
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#define ensure() ensure_impl(__FILE__, __LINE__)
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#define ensure_error() ensure_error_impl(__FILE__, __LINE__)
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#endif
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#if TD_PORT_POSIX
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#define OS_ERROR(message) \
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[&]() { \
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auto saved_errno = errno; \
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return ::td::Status::PosixError(saved_errno, (message)); \
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}()
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#define OS_SOCKET_ERROR(message) OS_ERROR(message)
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#elif TD_PORT_WINDOWS
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#define OS_ERROR(message) \
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[&]() { \
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auto saved_error = ::GetLastError(); \
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return ::td::Status::WindowsError(saved_error, (message)); \
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}()
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#define OS_SOCKET_ERROR(message) \
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[&]() { \
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auto saved_error = ::WSAGetLastError(); \
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return ::td::Status::WindowsError(saved_error, (message)); \
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}()
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#endif
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namespace td {
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#if TD_PORT_POSIX
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CSlice strerror_safe(int code);
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#endif
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#if TD_PORT_WINDOWS
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string winerror_to_string(int code);
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#endif
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class Status {
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enum class ErrorType : int8 { general, os };
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public:
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Status() = default;
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bool operator==(const Status &other) const {
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return ptr_ == other.ptr_;
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}
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Status clone() const TD_WARN_UNUSED_RESULT {
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if (is_ok()) {
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return Status();
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}
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auto info = get_info();
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if (info.static_flag) {
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return clone_static();
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}
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return Status(false, info.error_type, info.error_code, message());
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}
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static Status OK() TD_WARN_UNUSED_RESULT {
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return Status();
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}
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static Status Error(int err, Slice message = Slice()) TD_WARN_UNUSED_RESULT {
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return Status(false, ErrorType::general, err, message);
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}
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static Status Error(Slice message) TD_WARN_UNUSED_RESULT {
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return Error(0, message);
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}
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#if TD_PORT_WINDOWS
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static Status WindowsError(int saved_error, Slice message) TD_WARN_UNUSED_RESULT {
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return Status(false, ErrorType::os, saved_error, message);
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}
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#endif
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#if TD_PORT_POSIX
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static Status PosixError(int32 saved_errno, Slice message) TD_WARN_UNUSED_RESULT {
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return Status(false, ErrorType::os, saved_errno, message);
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}
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#endif
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static Status Error() TD_WARN_UNUSED_RESULT {
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return Error<0>();
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}
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template <int Code>
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static Status Error() {
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static Status status(true, ErrorType::general, Code, "");
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return status.clone_static();
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}
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StringBuilder &print(StringBuilder &sb) const {
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if (is_ok()) {
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return sb << "OK";
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}
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Info info = get_info();
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switch (info.error_type) {
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case ErrorType::general:
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sb << "[Error";
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break;
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case ErrorType::os:
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#if TD_PORT_POSIX
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sb << "[PosixError : " << strerror_safe(info.error_code);
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#elif TD_PORT_WINDOWS
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sb << "[WindowsError : " << winerror_to_string(info.error_code);
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#endif
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break;
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default:
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UNREACHABLE();
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break;
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}
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sb << " : " << code() << " : " << message() << "]";
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return sb;
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}
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string to_string() const {
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auto buf = StackAllocator::alloc(4096);
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StringBuilder sb(buf.as_slice());
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print(sb);
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return sb.as_cslice().str();
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}
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// Default interface
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bool is_ok() const TD_WARN_UNUSED_RESULT {
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return !is_error();
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}
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bool is_error() const TD_WARN_UNUSED_RESULT {
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return ptr_ != nullptr;
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}
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#ifdef TD_STATUS_NO_ENSURE
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void ensure() const {
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if (!is_ok()) {
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LOG(FATAL) << "Unexpected Status " << to_string();
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}
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}
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void ensure_error() const {
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if (is_ok()) {
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LOG(FATAL) << "Unexpected Status::OK";
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}
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}
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#else
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void ensure_impl(CSlice file_name, int line) const {
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if (!is_ok()) {
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LOG(FATAL) << "Unexpected Status " << to_string() << " in file " << file_name << " at line " << line;
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}
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}
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void ensure_error_impl(CSlice file_name, int line) const {
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if (is_ok()) {
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LOG(FATAL) << "Unexpected Status::OK in file " << file_name << " at line " << line;
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}
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}
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#endif
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void ignore() const {
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// nop
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}
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int32 code() const {
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if (is_ok()) {
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return 0;
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}
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return get_info().error_code;
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}
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CSlice message() const {
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if (is_ok()) {
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return CSlice("OK");
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}
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return CSlice(ptr_.get() + sizeof(Info));
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}
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string public_message() const {
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if (is_ok()) {
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return "OK";
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}
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Info info = get_info();
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switch (info.error_type) {
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case ErrorType::general:
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return message().str();
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case ErrorType::os:
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#if TD_PORT_POSIX
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return strerror_safe(info.error_code).str();
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#elif TD_PORT_WINDOWS
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return winerror_to_string(info.error_code);
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#endif
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default:
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UNREACHABLE();
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return "";
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}
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}
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const Status &error() const {
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return *this;
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}
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Status move() TD_WARN_UNUSED_RESULT {
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return std::move(*this);
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}
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Status move_as_error() TD_WARN_UNUSED_RESULT {
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return std::move(*this);
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}
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Status move_as_error_prefix(std::string prefix) TD_WARN_UNUSED_RESULT {
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return td::Status::Error(code(), prefix + message().c_str());
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}
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private:
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struct Info {
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bool static_flag : 1;
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signed int error_code : 23;
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ErrorType error_type;
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};
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struct Deleter {
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void operator()(char *ptr) {
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if (!get_info(ptr).static_flag) {
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delete[] ptr;
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}
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}
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};
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std::unique_ptr<char[], Deleter> ptr_;
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Status(Info info, Slice message) {
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size_t size = sizeof(Info) + message.size() + 1;
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ptr_ = std::unique_ptr<char[], Deleter>(new char[size]);
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char *ptr = ptr_.get();
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reinterpret_cast<Info *>(ptr)[0] = info;
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ptr += sizeof(Info);
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std::memcpy(ptr, message.begin(), message.size());
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ptr += message.size();
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*ptr = 0;
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}
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Status(bool static_flag, ErrorType error_type, int error_code, Slice message)
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: Status(to_info(static_flag, error_type, error_code), message) {
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if (static_flag) {
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TD_LSAN_IGNORE(ptr_.get());
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}
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}
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Status clone_static() const TD_WARN_UNUSED_RESULT {
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CHECK(is_ok() || get_info().static_flag);
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Status result;
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result.ptr_ = std::unique_ptr<char[], Deleter>(ptr_.get());
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return result;
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}
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static Info to_info(bool static_flag, ErrorType error_type, int error_code) {
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const int MIN_ERROR_CODE = -(1 << 22) + 1;
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const int MAX_ERROR_CODE = (1 << 22) - 1;
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Info tmp;
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tmp.static_flag = static_flag;
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tmp.error_type = error_type;
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if (error_code < MIN_ERROR_CODE) {
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LOG(ERROR) << "Error code value is altered from " << error_code;
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error_code = MIN_ERROR_CODE;
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}
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if (error_code > MAX_ERROR_CODE) {
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LOG(ERROR) << "Error code value is altered from " << error_code;
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error_code = MAX_ERROR_CODE;
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}
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#if TD_GCC
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wconversion"
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#endif
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tmp.error_code = error_code;
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#if TD_GCC
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#pragma GCC diagnostic pop
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#endif
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CHECK(error_code == tmp.error_code);
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return tmp;
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}
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Info get_info() const {
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return get_info(ptr_.get());
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}
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static Info get_info(char *ptr) {
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return reinterpret_cast<Info *>(ptr)[0];
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}
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};
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template <class T = Unit>
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class Result {
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public:
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Result() : status_(Status::Error<-1>()) {
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}
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template <class S, std::enable_if_t<!std::is_same<std::decay_t<S>, Result>::value, int> = 0>
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Result(S &&x) : status_(), value_(std::forward<S>(x)) {
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}
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struct emplace_t {};
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template <class... ArgsT>
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Result(emplace_t, ArgsT &&... args) : status_(), value_(std::forward<ArgsT>(args)...) {
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}
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Result(Status &&status) : status_(std::move(status)) {
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CHECK(status_.is_error());
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}
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Result(const Result &) = delete;
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Result &operator=(const Result &) = delete;
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Result(Result &&other) : status_(std::move(other.status_)) {
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if (status_.is_ok()) {
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new (&value_) T(std::move(other.value_));
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other.value_.~T();
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}
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other.status_ = Status::Error<-2>();
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}
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Result &operator=(Result &&other) {
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CHECK(this != &other);
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if (status_.is_ok()) {
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value_.~T();
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}
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if (other.status_.is_ok()) {
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#if TD_GCC
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
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#endif
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new (&value_) T(std::move(other.value_));
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#if TD_GCC
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#pragma GCC diagnostic pop
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#endif
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other.value_.~T();
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}
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status_ = std::move(other.status_);
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other.status_ = Status::Error<-3>();
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return *this;
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}
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template <class... ArgsT>
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void emplace(ArgsT &&... args) {
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if (status_.is_ok()) {
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value_.~T();
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}
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new (&value_) T(std::forward<ArgsT>(args)...);
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status_ = Status::OK();
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}
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~Result() {
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if (status_.is_ok()) {
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value_.~T();
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}
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}
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#ifdef TD_STATUS_NO_ENSURE
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void ensure() const {
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status_.ensure();
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}
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void ensure_error() const {
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status_.ensure_error();
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}
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#else
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void ensure_impl(CSlice file_name, int line) const {
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status_.ensure_impl(file_name, line);
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}
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void ensure_error_impl(CSlice file_name, int line) const {
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status_.ensure_error_impl(file_name, line);
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}
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#endif
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void ignore() const {
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status_.ignore();
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}
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bool is_ok() const {
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return status_.is_ok();
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}
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bool is_error() const {
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return status_.is_error();
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}
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const Status &error() const {
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CHECK(status_.is_error());
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return status_;
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}
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Status move_as_error() TD_WARN_UNUSED_RESULT {
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CHECK(status_.is_error());
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SCOPE_EXIT {
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status_ = Status::Error<-4>();
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};
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return std::move(status_);
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}
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Status move_as_error_prefix(std::string prefix) TD_WARN_UNUSED_RESULT {
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CHECK(status_.is_error());
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SCOPE_EXIT {
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status_ = Status::Error<-4>();
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};
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return status_.move_as_error_prefix(prefix);
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}
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const T &ok() const {
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LOG_CHECK(status_.is_ok()) << status_;
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return value_;
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}
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T &ok_ref() {
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LOG_CHECK(status_.is_ok()) << status_;
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return value_;
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}
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const T &ok_ref() const {
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LOG_CHECK(status_.is_ok()) << status_;
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return value_;
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}
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T move_as_ok() {
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LOG_CHECK(status_.is_ok()) << status_;
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return std::move(value_);
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}
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Result<T> clone() const TD_WARN_UNUSED_RESULT {
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if (is_ok()) {
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return Result<T>(ok()); // TODO: return clone(ok());
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}
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return error().clone();
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}
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void clear() {
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*this = Result<T>();
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}
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private:
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Status status_;
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union {
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T value_;
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};
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};
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template <>
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inline Result<Unit>::Result(Status &&status) : status_(std::move(status)) {
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// no assert
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}
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inline StringBuilder &operator<<(StringBuilder &string_builder, const Status &status) {
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return status.print(string_builder);
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}
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namespace detail {
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class SlicifySafe {
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public:
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Result<CSlice> operator&(Logger &logger) {
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if (logger.is_error()) {
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return Status::Error("Buffer overflow");
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}
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return logger.as_cslice();
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}
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};
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class StringifySafe {
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public:
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Result<string> operator&(Logger &logger) {
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if (logger.is_error()) {
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return Status::Error("Buffer overflow");
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}
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return logger.as_cslice().str();
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}
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};
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} // namespace detail
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} // namespace td
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