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https://github.com/facebook/sapling.git
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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
52 lines
1.5 KiB
C++
52 lines
1.5 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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#include "StoreResult.h"
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#include <folly/io/IOBuf.h>
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using folly::IOBuf;
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namespace {
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void freeString(void* /* buffer */, void* userData) {
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auto str = static_cast<std::string*>(userData);
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delete str;
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}
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} // namespace
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namespace facebook {
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namespace eden {
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IOBuf StoreResult::iobufWrapper() const {
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ensureValid();
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return IOBuf{IOBuf::WRAP_BUFFER, bytes()};
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}
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folly::IOBuf StoreResult::extractIOBuf() {
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ensureValid();
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// Unfortunately RocksDB returns data to us in a std::string. This makes it
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// difficult for us to control the lifetime. We end up having to allocate a
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// new std::string on the heap, just to control when it will free the
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// underlying data it points to.
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auto stringPtr = std::make_unique<std::string>(std::move(data_));
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// Extract the data and size before we pass stringPtr.release()
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// to the IOBuf constructor. Arguments are evaluated in an arbitrary order,
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// and we need to make sure we do this before release() happens.
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auto data = const_cast<char*>(stringPtr->data());
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auto size = stringPtr->size();
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return IOBuf(
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IOBuf::TAKE_OWNERSHIP, data, size, freeString, stringPtr.release());
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}
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[[noreturn]] void StoreResult::throwInvalidError() const {
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// Maybe we should define our own more specific error type in the future
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throw std::domain_error("value not present in store");
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}
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} // namespace eden
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} // namespace facebook
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