Nelze vybrat více než 25 témat
Téma musí začínat písmenem nebo číslem, může obsahovat pomlčky („-“) a může být dlouhé až 35 znaků.
144 řádky
4.0 KiB
144 řádky
4.0 KiB
// 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 <ctype.h>
|
|
#include <stdio.h>
|
|
#include "db/filename.h"
|
|
#include "db/dbformat.h"
|
|
#include "leveldb/env.h"
|
|
#include "util/logging.h"
|
|
|
|
namespace leveldb {
|
|
|
|
// A utility routine: write "data" to the named file and Sync() it.
|
|
Status WriteStringToFileSync(Env* env, const Slice& data,
|
|
const std::string& fname);
|
|
|
|
static std::string MakeFileName(const std::string& dbname, uint64_t number,
|
|
const char* suffix) {
|
|
char buf[100];
|
|
snprintf(buf, sizeof(buf), "/%06llu.%s",
|
|
static_cast<unsigned long long>(number),
|
|
suffix);
|
|
return dbname + buf;
|
|
}
|
|
|
|
std::string LogFileName(const std::string& dbname, uint64_t number) {
|
|
assert(number > 0);
|
|
return MakeFileName(dbname, number, "log");
|
|
}
|
|
|
|
std::string TableFileName(const std::string& dbname, uint64_t number) {
|
|
assert(number > 0);
|
|
return MakeFileName(dbname, number, "ldb");
|
|
}
|
|
|
|
std::string SSTTableFileName(const std::string& dbname, uint64_t number) {
|
|
assert(number > 0);
|
|
return MakeFileName(dbname, 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) {
|
|
return dbname + "/LOG";
|
|
}
|
|
|
|
// Return the name of the old info log file for "dbname".
|
|
std::string OldInfoLogFileName(const std::string& dbname) {
|
|
return dbname + "/LOG.old";
|
|
}
|
|
|
|
|
|
// Owned filenames have the form:
|
|
// dbname/CURRENT
|
|
// dbname/LOCK
|
|
// dbname/LOG
|
|
// dbname/LOG.old
|
|
// dbname/MANIFEST-[0-9]+
|
|
// dbname/[0-9]+.(log|sst|ldb)
|
|
bool ParseFileName(const std::string& filename,
|
|
uint64_t* number,
|
|
FileType* type) {
|
|
Slice rest(filename);
|
|
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("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 {
|
|
// Avoid strtoull() to keep filename format independent of the
|
|
// current locale
|
|
uint64_t num;
|
|
if (!ConsumeDecimalNumber(&rest, &num)) {
|
|
return false;
|
|
}
|
|
Slice suffix = rest;
|
|
if (suffix == Slice(".log")) {
|
|
*type = kLogFile;
|
|
} else if (suffix == Slice(".sst") || suffix == Slice(".ldb")) {
|
|
*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 = WriteStringToFileSync(env, contents.ToString() + "\n", tmp);
|
|
if (s.ok()) {
|
|
s = env->RenameFile(tmp, CurrentFileName(dbname));
|
|
}
|
|
if (!s.ok()) {
|
|
env->DeleteFile(tmp);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
} // namespace leveldb
|