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rocksdb/db/filename.cc

262 lines
7.5 KiB

// Copyright (c) 2013, 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.
#include "db/filename.h"
#include <ctype.h>
#include <stdio.h>
#include "db/dbformat.h"
#include "rocksdb/env.h"
#include "util/logging.h"
namespace rocksdb {
// Given a path, flatten the path name by replacing all chars not in
// {[0-9,a-z,A-Z,-,_,.]} with _. And append '\0' at the end.
// Return the number of chars stored in dest not including the trailing '\0'.
static int FlattenPath(const std::string& path, char* dest, int len) {
int write_idx = 0;
int i = 0;
int src_len = path.size();
while (i < src_len && write_idx < len - 1) {
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++;
}
dest[write_idx] = '\0';
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 TableFileName(const std::string& name, uint64_t number) {
assert(number > 0);
return MakeFileName(name, number, "sst");
}
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) {
assert(number >= 0);
return MakeFileName(dbname, number, "dbtmp");
}
std::string InfoLogFileName(const std::string& dbname,
const std::string& db_path, const std::string& log_dir) {
if (log_dir.empty())
return dbname + "/LOG";
char flatten_db_path[256];
FlattenPath(db_path, flatten_db_path, 256);
return log_dir + "/" + flatten_db_path + "_LOG";
}
// 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;
char flatten_db_path[256];
FlattenPath(db_path, flatten_db_path, 256);
return log_dir + "/" + flatten_db_path + "_LOG.old." + buf;
}
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/LOG
// dbname/LOG.old.[0-9]+
// dbname/MANIFEST-[0-9]+
// dbname/[0-9]+.(log|sst)
// dbname/METADB-[0-9]+
// Disregards / at the beginning
bool ParseFileName(const std::string& fname,
uint64_t* number,
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 (rest == "LOG" || rest == "LOG.old") {
*number = 0;
*type = kInfoLogFile;
} else if (rest.starts_with("LOG.old.")) {
uint64_t ts_suffix;
// sizeof also counts the trailing '\0'.
rest.remove_prefix(sizeof("LOG.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 {
// 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;
}
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(".sst")) {
*type = kTableFile;
} else if (suffix == Slice(".dbtmp")) {
*type = kTempFile;
} else {
return false;
}
*number = num;
}
return true;
}
Status SetCurrentFile(Env* env, const std::string& dbname,
uint64_t descriptor_number) {
// 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()) {
s = env->RenameFile(tmp, CurrentFileName(dbname));
}
if (!s.ok()) {
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;
}
} // namespace rocksdb