mirror of https://github.com/facebook/rocksdb.git
262 lines
7.5 KiB
C++
262 lines
7.5 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/filename.h"
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#include <ctype.h>
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#include <stdio.h>
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#include "db/dbformat.h"
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#include "rocksdb/env.h"
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#include "util/logging.h"
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namespace rocksdb {
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// Given a path, flatten the path name by replacing all chars not in
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// {[0-9,a-z,A-Z,-,_,.]} with _. And append '\0' at the end.
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// Return the number of chars stored in dest not including the trailing '\0'.
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static int FlattenPath(const std::string& path, char* dest, int len) {
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int write_idx = 0;
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int i = 0;
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int src_len = path.size();
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while (i < src_len && write_idx < len - 1) {
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if ((path[i] >= 'a' && path[i] <= 'z') ||
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(path[i] >= '0' && path[i] <= '9') ||
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(path[i] >= 'A' && path[i] <= 'Z') ||
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path[i] == '-' ||
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path[i] == '.' ||
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path[i] == '_'){
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dest[write_idx++] = path[i];
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} else {
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if (i > 0)
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dest[write_idx++] = '_';
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}
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i++;
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}
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dest[write_idx] = '\0';
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return write_idx;
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}
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static std::string MakeFileName(const std::string& name, uint64_t number,
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const char* suffix) {
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char buf[100];
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snprintf(buf, sizeof(buf), "/%06llu.%s",
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static_cast<unsigned long long>(number),
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suffix);
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return name + buf;
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}
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std::string LogFileName(const std::string& name, uint64_t number) {
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assert(number > 0);
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return MakeFileName(name, number, "log");
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}
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std::string ArchivalDirectory(const std::string& dir) {
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return dir + "/" + ARCHIVAL_DIR;
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}
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std::string ArchivedLogFileName(const std::string& name, uint64_t number) {
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assert(number > 0);
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return MakeFileName(name + "/" + ARCHIVAL_DIR, number, "log");
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}
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std::string TableFileName(const std::string& name, uint64_t number) {
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assert(number > 0);
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return MakeFileName(name, number, "sst");
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}
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std::string DescriptorFileName(const std::string& dbname, uint64_t number) {
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assert(number > 0);
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char buf[100];
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snprintf(buf, sizeof(buf), "/MANIFEST-%06llu",
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static_cast<unsigned long long>(number));
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return dbname + buf;
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}
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std::string CurrentFileName(const std::string& dbname) {
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return dbname + "/CURRENT";
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}
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std::string LockFileName(const std::string& dbname) {
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return dbname + "/LOCK";
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}
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std::string TempFileName(const std::string& dbname, uint64_t number) {
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return MakeFileName(dbname, number, "dbtmp");
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}
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std::string InfoLogFileName(const std::string& dbname,
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const std::string& db_path, const std::string& log_dir) {
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if (log_dir.empty())
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return dbname + "/LOG";
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char flatten_db_path[256];
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FlattenPath(db_path, flatten_db_path, 256);
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return log_dir + "/" + flatten_db_path + "_LOG";
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}
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// Return the name of the old info log file for "dbname".
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std::string OldInfoLogFileName(const std::string& dbname, uint64_t ts,
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const std::string& db_path, const std::string& log_dir) {
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char buf[50];
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snprintf(buf, sizeof(buf), "%llu", static_cast<unsigned long long>(ts));
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if (log_dir.empty())
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return dbname + "/LOG.old." + buf;
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char flatten_db_path[256];
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FlattenPath(db_path, flatten_db_path, 256);
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return log_dir + "/" + flatten_db_path + "_LOG.old." + buf;
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}
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std::string MetaDatabaseName(const std::string& dbname, uint64_t number) {
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char buf[100];
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snprintf(buf, sizeof(buf), "/METADB-%llu",
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static_cast<unsigned long long>(number));
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return dbname + buf;
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}
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std::string IdentityFileName(const std::string& dbname) {
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return dbname + "/IDENTITY";
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}
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// Owned filenames have the form:
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// dbname/IDENTITY
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// dbname/CURRENT
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// dbname/LOCK
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// dbname/LOG
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// dbname/LOG.old.[0-9]+
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// dbname/MANIFEST-[0-9]+
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// dbname/[0-9]+.(log|sst)
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// dbname/METADB-[0-9]+
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// Disregards / at the beginning
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bool ParseFileName(const std::string& fname,
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uint64_t* number,
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FileType* type,
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WalFileType* log_type) {
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Slice rest(fname);
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if (fname.length() > 1 && fname[0] == '/') {
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rest.remove_prefix(1);
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}
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if (rest == "IDENTITY") {
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*number = 0;
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*type = kIdentityFile;
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} else if (rest == "CURRENT") {
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*number = 0;
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*type = kCurrentFile;
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} else if (rest == "LOCK") {
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*number = 0;
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*type = kDBLockFile;
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} else if (rest == "LOG" || rest == "LOG.old") {
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*number = 0;
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*type = kInfoLogFile;
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} else if (rest.starts_with("LOG.old.")) {
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uint64_t ts_suffix;
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// sizeof also counts the trailing '\0'.
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rest.remove_prefix(sizeof("LOG.old.") - 1);
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if (!ConsumeDecimalNumber(&rest, &ts_suffix)) {
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return false;
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}
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*number = ts_suffix;
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*type = kInfoLogFile;
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} else if (rest.starts_with("MANIFEST-")) {
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rest.remove_prefix(strlen("MANIFEST-"));
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uint64_t num;
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if (!ConsumeDecimalNumber(&rest, &num)) {
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return false;
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}
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if (!rest.empty()) {
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return false;
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}
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*type = kDescriptorFile;
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*number = num;
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} else if (rest.starts_with("METADB-")) {
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rest.remove_prefix(strlen("METADB-"));
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uint64_t num;
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if (!ConsumeDecimalNumber(&rest, &num)) {
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return false;
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}
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if (!rest.empty()) {
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return false;
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}
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*type = kMetaDatabase;
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*number = num;
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} else {
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// Avoid strtoull() to keep filename format independent of the
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// current locale
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bool archive_dir_found = false;
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if (rest.starts_with(ARCHIVAL_DIR)) {
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if (rest.size() <= ARCHIVAL_DIR.size()) {
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return false;
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}
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rest.remove_prefix(ARCHIVAL_DIR.size() + 1); // Add 1 to remove / also
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if (log_type) {
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*log_type = kArchivedLogFile;
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}
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archive_dir_found = true;
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}
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uint64_t num;
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if (!ConsumeDecimalNumber(&rest, &num)) {
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return false;
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}
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Slice suffix = rest;
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if (suffix == Slice(".log")) {
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*type = kLogFile;
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if (log_type && !archive_dir_found) {
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*log_type = kAliveLogFile;
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}
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} else if (archive_dir_found) {
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return false; // Archive dir can contain only log files
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} else if (suffix == Slice(".sst")) {
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*type = kTableFile;
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} else if (suffix == Slice(".dbtmp")) {
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*type = kTempFile;
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} else {
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return false;
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}
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*number = num;
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}
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return true;
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}
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Status SetCurrentFile(Env* env, const std::string& dbname,
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uint64_t descriptor_number) {
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// Remove leading "dbname/" and add newline to manifest file name
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std::string manifest = DescriptorFileName(dbname, descriptor_number);
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Slice contents = manifest;
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assert(contents.starts_with(dbname + "/"));
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contents.remove_prefix(dbname.size() + 1);
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std::string tmp = TempFileName(dbname, descriptor_number);
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Status s = WriteStringToFile(env, contents.ToString() + "\n", tmp, true);
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if (s.ok()) {
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s = env->RenameFile(tmp, CurrentFileName(dbname));
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}
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if (!s.ok()) {
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env->DeleteFile(tmp);
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}
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return s;
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}
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Status SetIdentityFile(Env* env, const std::string& dbname) {
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std::string id = env->GenerateUniqueId();
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assert(!id.empty());
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// Reserve the filename dbname/000000.dbtmp for the temporary identity file
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std::string tmp = TempFileName(dbname, 0);
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Status s = WriteStringToFile(env, id, tmp, true);
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if (s.ok()) {
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s = env->RenameFile(tmp, IdentityFileName(dbname));
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}
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if (!s.ok()) {
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env->DeleteFile(tmp);
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}
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return s;
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}
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} // namespace rocksdb
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