109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
#include <cstring>
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#include <fstream>
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#include <boost/filesystem.hpp>
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#include "OnDiskBlock.h"
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#include "OnDiskBlockStore.h"
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#include "../../utils/FileDoesntExistException.h"
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#include <cpp-utils/data/DataUtils.h>
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#include <cpp-utils/assert/assert.h>
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using std::istream;
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using std::ostream;
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using std::ifstream;
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using std::ofstream;
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using std::ios;
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using cpputils::Data;
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using cpputils::make_unique_ref;
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using cpputils::unique_ref;
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using boost::optional;
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using boost::none;
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namespace bf = boost::filesystem;
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namespace blockstore {
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namespace ondisk {
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OnDiskBlock::OnDiskBlock(const Key &key, const bf::path &filepath, Data data)
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: Block(key), _filepath(filepath), _data(std::move(data)), _dataChanged(false), _mutex() {
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}
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OnDiskBlock::~OnDiskBlock() {
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flush();
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}
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const void *OnDiskBlock::data() const {
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return _data.data();
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}
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void OnDiskBlock::write(const void *source, uint64_t offset, uint64_t size) {
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ASSERT(offset <= _data.size() && offset + size <= _data.size(), "Write outside of valid area"); //Also check offset < _data->size() because of possible overflow in the addition
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std::memcpy((uint8_t*)_data.data()+offset, source, size);
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_dataChanged = true;
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}
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size_t OnDiskBlock::size() const {
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return _data.size();
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}
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void OnDiskBlock::resize(size_t newSize) {
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_data = cpputils::DataUtils::resize(std::move(_data), newSize);
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_dataChanged = true;
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}
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optional<unique_ref<OnDiskBlock>> OnDiskBlock::LoadFromDisk(const bf::path &rootdir, const Key &key) {
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auto filepath = rootdir / key.ToString();
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try {
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//If it isn't a file, Data::LoadFromFile() would usually also crash. We still need this extra check
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//upfront, because Data::LoadFromFile() doesn't crash if we give it the path of a directory
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//instead the path of a file.
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//TODO Data::LoadFromFile now returns boost::optional. Do we then still need this?
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if(!bf::is_regular_file(filepath)) {
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return none;
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}
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boost::optional<Data> data = Data::LoadFromFile(filepath);
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if (!data) {
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return none;
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}
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return make_unique_ref<OnDiskBlock>(key, filepath, std::move(*data));
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} catch (const FileDoesntExistException &e) {
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return none;
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}
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}
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optional<unique_ref<OnDiskBlock>> OnDiskBlock::CreateOnDisk(const bf::path &rootdir, const Key &key, Data data) {
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auto filepath = rootdir / key.ToString();
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if (bf::exists(filepath)) {
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return none;
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}
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auto block = make_unique_ref<OnDiskBlock>(key, filepath, std::move(data));
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block->_storeToDisk();
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return std::move(block);
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}
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void OnDiskBlock::RemoveFromDisk(const bf::path &rootdir, const Key &key) {
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auto filepath = rootdir / key.ToString();
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ASSERT(bf::is_regular_file(filepath), "Block not found on disk");
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bf::remove(filepath);
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}
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void OnDiskBlock::_fillDataWithZeroes() {
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_data.FillWithZeroes();
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_dataChanged = true;
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}
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void OnDiskBlock::_storeToDisk() const {
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_data.StoreToFile(_filepath);
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}
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void OnDiskBlock::flush() {
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std::unique_lock<std::mutex> lock(_mutex);
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if (_dataChanged) {
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_storeToDisk();
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_dataChanged = false;
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}
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}
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}
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}
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