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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <folly/Format.h>
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#include <folly/Synchronized.h>
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#include <memory>
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#include <optional>
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#include <system_error>
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#include "eden/fs/inodes/InodePtr.h"
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#include "eden/fs/utils/PathFuncs.h"
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namespace facebook {
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namespace eden {
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/**
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* A subclass of std::system_error referring to a specific inode.
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*
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* The main advantage of this class is that it can include the Inode path in
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* the error message. However, it avoids computing the path until the error
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* message is actually needed. If the error is caught and handled without
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* looking at the error message, then the path never needs to be computed.
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*/
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class InodeError : public std::system_error {
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public:
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InodeError(int errnum, InodePtr inode)
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: std::system_error(errnum, std::generic_category()),
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inode_(std::move(inode)) {}
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InodeError(int errnum, TreeInodePtr inode, PathComponentPiece child);
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InodeError(int errnum, InodePtr inode, std::string message)
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: std::system_error(errnum, std::generic_category()),
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inode_(std::move(inode)),
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message_(std::move(message)) {}
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InodeError(
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int errnum,
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TreeInodePtr inode,
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PathComponentPiece child,
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std::string&& message);
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template <typename... Args>
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InodeError(
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int errnum,
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InodePtr inode,
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folly::StringPiece format,
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Args&&... args)
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: InodeError(
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errnum,
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inode,
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folly::sformat(format, std::forward<Args>(args)...)) {}
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template <typename... Args>
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InodeError(
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int errnum,
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TreeInodePtr inode,
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PathComponentPiece child,
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folly::StringPiece format,
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Args&&... args)
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: InodeError(
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errnum,
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inode,
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child,
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message_(folly::sformat(format, std::forward<Args>(args)...))) {}
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const char* what() const noexcept override;
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int errnum() const {
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return code().value();
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}
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InodeError(InodeError const&) = default;
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InodeError& operator=(InodeError const&) = default;
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InodeError(InodeError&&) = default;
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InodeError& operator=(InodeError&&) = default;
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private:
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std::string computeMessage() const;
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InodePtr inode_;
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std::optional<PathComponent> child_;
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std::string message_;
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mutable folly::Synchronized<std::string> fullMessage_;
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};
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} // namespace eden
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} // namespace facebook
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