filename.cc
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include "db/filename.h"
#include <inttypes.h>
#include <ctype.h>
#include <stdio.h>
#include <vector>
#include "db/dbformat.h"
#include "rocksdb/env.h"
#include "util/file_reader_writer.h"
#include "util/logging.h"
#include "util/stop_watch.h"
#include "util/string_util.h"
#include "util/sync_point.h"
namespace rocksdb {
static const std::string kRocksDbTFileExt = "sst";
static const std::string kLevelDbTFileExt = "ldb";
// Given a path, flatten the path name by replacing all chars not in
// {[0-9,a-z,A-Z,-,_,.]} with _. And append '_LOG\0' at the end.
// Return the number of chars stored in dest not including the trailing '\0'.
static size_t GetInfoLogPrefix(const std::string& path, char* dest, int len) {
const char suffix[] = "_LOG";
size_t write_idx = 0;
size_t i = 0;
size_t src_len = path.size();
while (i < src_len && write_idx < len - sizeof(suffix)) {
if ((path[i] >= 'a' && path[i] <= 'z') ||
(path[i] >= '0' && path[i] <= '9') ||
(path[i] >= 'A' && path[i] <= 'Z') ||
path[i] == '-' ||
path[i] == '.' ||
path[i] == '_'){
dest[write_idx++] = path[i];
} else {
if (i > 0) {
dest[write_idx++] = '_';
}
}
i++;
}
assert(sizeof(suffix) <= len - write_idx);
// "\0" is automatically added by snprintf
snprintf(dest + write_idx, len - write_idx, suffix);
write_idx += sizeof(suffix) - 1;
return write_idx;
}
static std::string MakeFileName(const std::string& name, uint64_t number,
const char* suffix) {
char buf[100];
snprintf(buf, sizeof(buf), "/%06llu.%s",
static_cast<unsigned long long>(number),
suffix);
return name + buf;
}
std::string LogFileName(const std::string& name, uint64_t number) {
assert(number > 0);
return MakeFileName(name, number, "log");
}
std::string ArchivalDirectory(const std::string& dir) {
return dir + "/" + ARCHIVAL_DIR;
}
std::string ArchivedLogFileName(const std::string& name, uint64_t number) {
assert(number > 0);
return MakeFileName(name + "/" + ARCHIVAL_DIR, number, "log");
}
std::string MakeTableFileName(const std::string& path, uint64_t number) {
return MakeFileName(path, number, kRocksDbTFileExt.c_str());
}
std::string Rocks2LevelTableFileName(const std::string& fullname) {
assert(fullname.size() > kRocksDbTFileExt.size() + 1);
if (fullname.size() <= kRocksDbTFileExt.size() + 1) {
return "";
}
return fullname.substr(0, fullname.size() - kRocksDbTFileExt.size()) +
kLevelDbTFileExt;
}
uint64_t TableFileNameToNumber(const std::string& name) {
uint64_t number = 0;
uint64_t base = 1;
int pos = static_cast<int>(name.find_last_of('.'));
while (--pos >= 0 && name[pos] >= '0' && name[pos] <= '9') {
number += (name[pos] - '0') * base;
base *= 10;
}
return number;
}
std::string TableFileName(const std::vector<DbPath>& db_paths, uint64_t number,
uint32_t path_id) {
assert(number > 0);
std::string path;
if (path_id >= db_paths.size()) {
path = db_paths.back().path;
} else {
path = db_paths[path_id].path;
}
return MakeTableFileName(path, number);
}
void FormatFileNumber(uint64_t number, uint32_t path_id, char* out_buf,
size_t out_buf_size) {
if (path_id == 0) {
snprintf(out_buf, out_buf_size, "%" PRIu64, number);
} else {
snprintf(out_buf, out_buf_size, "%" PRIu64
"(path "
"%" PRIu32 ")",
number, path_id);
}
}
std::string DescriptorFileName(const std::string& dbname, uint64_t number) {
assert(number > 0);
char buf[100];
snprintf(buf, sizeof(buf), "/MANIFEST-%06llu",
static_cast<unsigned long long>(number));
return dbname + buf;
}
std::string CurrentFileName(const std::string& dbname) {
return dbname + "/CURRENT";
}
std::string LockFileName(const std::string& dbname) {
return dbname + "/LOCK";
}
std::string TempFileName(const std::string& dbname, uint64_t number) {
return MakeFileName(dbname, number, kTempFileNameSuffix.c_str());
}
InfoLogPrefix::InfoLogPrefix(bool has_log_dir,
const std::string& db_absolute_path) {
if (!has_log_dir) {
const char kInfoLogPrefix[] = "LOG";
// "\0" is automatically added to the end
snprintf(buf, sizeof(buf), kInfoLogPrefix);
prefix = Slice(buf, sizeof(kInfoLogPrefix) - 1);
} else {
size_t len = GetInfoLogPrefix(db_absolute_path, buf, sizeof(buf));
prefix = Slice(buf, len);
}
}
std::string InfoLogFileName(const std::string& dbname,
const std::string& db_path, const std::string& log_dir) {
if (log_dir.empty()) {
return dbname + "/LOG";
}
InfoLogPrefix info_log_prefix(true, db_path);
return log_dir + "/" + info_log_prefix.buf;
}
// Return the name of the old info log file for "dbname".
std::string OldInfoLogFileName(const std::string& dbname, uint64_t ts,
const std::string& db_path, const std::string& log_dir) {
char buf[50];
snprintf(buf, sizeof(buf), "%llu", static_cast<unsigned long long>(ts));
if (log_dir.empty()) {
return dbname + "/LOG.old." + buf;
}
InfoLogPrefix info_log_prefix(true, db_path);
return log_dir + "/" + info_log_prefix.buf + ".old." + buf;
}
std::string OptionsFileName(const std::string& dbname, uint64_t file_num) {
char buffer[256];
snprintf(buffer, sizeof(buffer), "%s%06" PRIu64,
kOptionsFileNamePrefix.c_str(), file_num);
return dbname + "/" + buffer;
}
std::string TempOptionsFileName(const std::string& dbname, uint64_t file_num) {
char buffer[256];
snprintf(buffer, sizeof(buffer), "%s%06" PRIu64 ".%s",
kOptionsFileNamePrefix.c_str(), file_num,
kTempFileNameSuffix.c_str());
return dbname + "/" + buffer;
}
std::string MetaDatabaseName(const std::string& dbname, uint64_t number) {
char buf[100];
snprintf(buf, sizeof(buf), "/METADB-%llu",
static_cast<unsigned long long>(number));
return dbname + buf;
}
std::string IdentityFileName(const std::string& dbname) {
return dbname + "/IDENTITY";
}
// Owned filenames have the form:
// dbname/IDENTITY
// dbname/CURRENT
// dbname/LOCK
// dbname/<info_log_name_prefix>
// dbname/<info_log_name_prefix>.old.[0-9]+
// dbname/MANIFEST-[0-9]+
// dbname/[0-9]+.(log|sst)
// dbname/METADB-[0-9]+
// dbname/OPTIONS-[0-9]+
// dbname/OPTIONS-[0-9]+.dbtmp
// Disregards / at the beginning
bool ParseFileName(const std::string& fname,
uint64_t* number,
FileType* type,
WalFileType* log_type) {
return ParseFileName(fname, number, "", type, log_type);
}
bool ParseFileName(const std::string& fname, uint64_t* number,
const Slice& info_log_name_prefix, FileType* type,
WalFileType* log_type) {
Slice rest(fname);
if (fname.length() > 1 && fname[0] == '/') {
rest.remove_prefix(1);
}
if (rest == "IDENTITY") {
*number = 0;
*type = kIdentityFile;
} else if (rest == "CURRENT") {
*number = 0;
*type = kCurrentFile;
} else if (rest == "LOCK") {
*number = 0;
*type = kDBLockFile;
} else if (info_log_name_prefix.size() > 0 &&
rest.starts_with(info_log_name_prefix)) {
rest.remove_prefix(info_log_name_prefix.size());
if (rest == "" || rest == ".old") {
*number = 0;
*type = kInfoLogFile;
} else if (rest.starts_with(".old.")) {
uint64_t ts_suffix;
// sizeof also counts the trailing '\0'.
rest.remove_prefix(sizeof(".old.") - 1);
if (!ConsumeDecimalNumber(&rest, &ts_suffix)) {
return false;
}
*number = ts_suffix;
*type = kInfoLogFile;
}
} else if (rest.starts_with("MANIFEST-")) {
rest.remove_prefix(strlen("MANIFEST-"));
uint64_t num;
if (!ConsumeDecimalNumber(&rest, &num)) {
return false;
}
if (!rest.empty()) {
return false;
}
*type = kDescriptorFile;
*number = num;
} else if (rest.starts_with("METADB-")) {
rest.remove_prefix(strlen("METADB-"));
uint64_t num;
if (!ConsumeDecimalNumber(&rest, &num)) {
return false;
}
if (!rest.empty()) {
return false;
}
*type = kMetaDatabase;
*number = num;
} else if (rest.starts_with(kOptionsFileNamePrefix)) {
uint64_t ts_suffix;
bool is_temp_file = false;
rest.remove_prefix(kOptionsFileNamePrefix.size());
const std::string kTempFileNameSuffixWithDot =
std::string(".") + kTempFileNameSuffix;
if (rest.ends_with(kTempFileNameSuffixWithDot)) {
rest.remove_suffix(kTempFileNameSuffixWithDot.size());
is_temp_file = true;
}
if (!ConsumeDecimalNumber(&rest, &ts_suffix)) {
return false;
}
*number = ts_suffix;
*type = is_temp_file ? kTempFile : kOptionsFile;
} else {
// Avoid strtoull() to keep filename format independent of the
// current locale
bool archive_dir_found = false;
if (rest.starts_with(ARCHIVAL_DIR)) {
if (rest.size() <= ARCHIVAL_DIR.size()) {
return false;
}
rest.remove_prefix(ARCHIVAL_DIR.size() + 1); // Add 1 to remove / also
if (log_type) {
*log_type = kArchivedLogFile;
}
archive_dir_found = true;
}
uint64_t num;
if (!ConsumeDecimalNumber(&rest, &num)) {
return false;
}
if (rest.size() <= 1 || rest[0] != '.') {
return false;
}
rest.remove_prefix(1);
Slice suffix = rest;
if (suffix == Slice("log")) {
*type = kLogFile;
if (log_type && !archive_dir_found) {
*log_type = kAliveLogFile;
}
} else if (archive_dir_found) {
return false; // Archive dir can contain only log files
} else if (suffix == Slice(kRocksDbTFileExt) ||
suffix == Slice(kLevelDbTFileExt)) {
*type = kTableFile;
} else if (suffix == Slice(kTempFileNameSuffix)) {
*type = kTempFile;
} else {
return false;
}
*number = num;
}
return true;
}
Status SetCurrentFile(Env* env, const std::string& dbname,
uint64_t descriptor_number,
Directory* directory_to_fsync) {
// Remove leading "dbname/" and add newline to manifest file name
std::string manifest = DescriptorFileName(dbname, descriptor_number);
Slice contents = manifest;
assert(contents.starts_with(dbname + "/"));
contents.remove_prefix(dbname.size() + 1);
std::string tmp = TempFileName(dbname, descriptor_number);
Status s = WriteStringToFile(env, contents.ToString() + "\n", tmp, true);
if (s.ok()) {
TEST_KILL_RANDOM("SetCurrentFile:0", rocksdb_kill_odds * REDUCE_ODDS2);
s = env->RenameFile(tmp, CurrentFileName(dbname));
TEST_KILL_RANDOM("SetCurrentFile:1", rocksdb_kill_odds * REDUCE_ODDS2);
}
if (s.ok()) {
if (directory_to_fsync != nullptr) {
directory_to_fsync->Fsync();
}
} else {
env->DeleteFile(tmp);
}
return s;
}
Status SetIdentityFile(Env* env, const std::string& dbname) {
std::string id = env->GenerateUniqueId();
assert(!id.empty());
// Reserve the filename dbname/000000.dbtmp for the temporary identity file
std::string tmp = TempFileName(dbname, 0);
Status s = WriteStringToFile(env, id, tmp, true);
if (s.ok()) {
s = env->RenameFile(tmp, IdentityFileName(dbname));
}
if (!s.ok()) {
env->DeleteFile(tmp);
}
return s;
}
Status SyncManifest(Env* env, const ImmutableDBOptions* db_options,
WritableFileWriter* file) {
TEST_KILL_RANDOM("SyncManifest:0", rocksdb_kill_odds * REDUCE_ODDS2);
if (db_options->disable_data_sync) {
return Status::OK();
} else {
StopWatch sw(env, db_options->statistics.get(), MANIFEST_FILE_SYNC_MICROS);
return file->Sync(db_options->use_fsync);
}
}
} // namespace rocksdb
