rocksdb/util/file_checksum_helper.h

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <cassert>
#include <unordered_map>
#include "port/port.h"
#include "rocksdb/file_checksum.h"
#include "rocksdb/status.h"
#include "util/coding.h"
#include "util/crc32c.h"
namespace ROCKSDB_NAMESPACE {
// This is the class to generate the file checksum based on Crc32. It
// will be used as the default checksum method for SST file checksum
class FileChecksumGenCrc32c : public FileChecksumGenerator {
public:
FileChecksumGenCrc32c(const FileChecksumGenContext& /*context*/) {
checksum_ = 0;
}
void Update(const char* data, size_t n) override {
checksum_ = crc32c::Extend(checksum_, data, n);
}
void Finalize() override {
assert(checksum_str_.empty());
// Store as big endian raw bytes
PutFixed32(&checksum_str_, EndianSwapValue(checksum_));
}
std::string GetChecksum() const override {
assert(!checksum_str_.empty());
return checksum_str_;
}
const char* Name() const override { return "FileChecksumCrc32c"; }
private:
uint32_t checksum_;
std::string checksum_str_;
};
class FileChecksumGenCrc32cFactory : public FileChecksumGenFactory {
public:
std::unique_ptr<FileChecksumGenerator> CreateFileChecksumGenerator(
const FileChecksumGenContext& context) override {
if (context.requested_checksum_func_name.empty() ||
context.requested_checksum_func_name == "FileChecksumCrc32c") {
return std::unique_ptr<FileChecksumGenerator>(
new FileChecksumGenCrc32c(context));
} else {
return nullptr;
}
}
static const char* kClassName() { return "FileChecksumGenCrc32cFactory"; }
const char* Name() const override { return kClassName(); }
};
// The default implementaion of FileChecksumList
class FileChecksumListImpl : public FileChecksumList {
public:
FileChecksumListImpl() {}
void reset() override;
size_t size() const override;
Status GetAllFileChecksums(
std::vector<uint64_t>* file_numbers, std::vector<std::string>* checksums,
std::vector<std::string>* checksum_func_names) override;
Status SearchOneFileChecksum(uint64_t file_number, std::string* checksum,
std::string* checksum_func_name) override;
Status InsertOneFileChecksum(uint64_t file_number,
const std::string& checksum,
const std::string& checksum_func_name) override;
Status RemoveOneFileChecksum(uint64_t file_number) override;
private:
// Key is the file number, the first portion of the value is checksum, the
// second portion of the value is checksum function name.
std::unordered_map<uint64_t, std::pair<std::string, std::string>>
checksum_map_;
};
// If manifest_file_size < std::numeric_limits<uint64_t>::max(), only use
// that length prefix of the manifest file.
Status GetFileChecksumsFromManifest(Env* src_env, const std::string& abs_path,
uint64_t manifest_file_size,
FileChecksumList* checksum_list);
} // namespace ROCKSDB_NAMESPACE