Vous ne pouvez pas sélectionner plus de 25 sujets
Les noms de sujets doivent commencer par une lettre ou un nombre, peuvent contenir des tirets ('-') et peuvent comporter jusqu'à 35 caractères.
232 lignes
6.2 KiB
232 lignes
6.2 KiB
// Copyright (c) 2012 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 "leveldb/dumpfile.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "db/dbformat.h"
|
|
#include "db/filename.h"
|
|
#include "db/log_reader.h"
|
|
#include "db/version_edit.h"
|
|
#include "db/write_batch_internal.h"
|
|
#include "leveldb/env.h"
|
|
#include "leveldb/iterator.h"
|
|
#include "leveldb/options.h"
|
|
#include "leveldb/status.h"
|
|
#include "leveldb/table.h"
|
|
#include "leveldb/write_batch.h"
|
|
#include "util/logging.h"
|
|
|
|
namespace leveldb {
|
|
|
|
namespace {
|
|
|
|
bool GuessType(const std::string& fname, FileType* type) {
|
|
size_t pos = fname.rfind('/');
|
|
std::string basename;
|
|
if (pos == std::string::npos) {
|
|
basename = fname;
|
|
} else {
|
|
basename = std::string(fname.data() + pos + 1, fname.size() - pos - 1);
|
|
}
|
|
uint64_t ignored;
|
|
return ParseFileName(basename, &ignored, type);
|
|
}
|
|
|
|
// Notified when log reader encounters corruption.
|
|
class CorruptionReporter : public log::Reader::Reporter {
|
|
public:
|
|
void Corruption(size_t bytes, const Status& status) override {
|
|
std::string r = "corruption: ";
|
|
AppendNumberTo(&r, bytes);
|
|
r += " bytes; ";
|
|
r += status.ToString();
|
|
r.push_back('\n');
|
|
dst_->Append(r);
|
|
}
|
|
|
|
WritableFile* dst_;
|
|
};
|
|
|
|
// Print contents of a log file. (*func)() is called on every record.
|
|
Status PrintLogContents(Env* env, const std::string& fname,
|
|
void (*func)(uint64_t, Slice, WritableFile*),
|
|
WritableFile* dst) {
|
|
SequentialFile* file;
|
|
Status s = env->NewSequentialFile(fname, &file);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
CorruptionReporter reporter;
|
|
reporter.dst_ = dst;
|
|
log::Reader reader(file, &reporter, true, 0);
|
|
Slice record;
|
|
std::string scratch;
|
|
while (reader.ReadRecord(&record, &scratch)) {
|
|
(*func)(reader.LastRecordOffset(), record, dst);
|
|
}
|
|
delete file;
|
|
return Status::OK();
|
|
}
|
|
|
|
// Called on every item found in a WriteBatch.
|
|
class WriteBatchItemPrinter : public WriteBatch::Handler {
|
|
public:
|
|
void Put(const Slice& key, const Slice& value) override {
|
|
std::string r = " put '";
|
|
AppendEscapedStringTo(&r, key);
|
|
r += "' '";
|
|
AppendEscapedStringTo(&r, value);
|
|
r += "'\n";
|
|
dst_->Append(r);
|
|
}
|
|
void Delete(const Slice& key) override {
|
|
std::string r = " del '";
|
|
AppendEscapedStringTo(&r, key);
|
|
r += "'\n";
|
|
dst_->Append(r);
|
|
}
|
|
|
|
WritableFile* dst_;
|
|
};
|
|
|
|
// Called on every log record (each one of which is a WriteBatch)
|
|
// found in a kLogFile.
|
|
static void WriteBatchPrinter(uint64_t pos, Slice record, WritableFile* dst) {
|
|
std::string r = "--- offset ";
|
|
AppendNumberTo(&r, pos);
|
|
r += "; ";
|
|
if (record.size() < 12) {
|
|
r += "log record length ";
|
|
AppendNumberTo(&r, record.size());
|
|
r += " is too small\n";
|
|
dst->Append(r);
|
|
return;
|
|
}
|
|
WriteBatch batch;
|
|
WriteBatchInternal::SetContents(&batch, record);
|
|
r += "sequence ";
|
|
AppendNumberTo(&r, WriteBatchInternal::Sequence(&batch));
|
|
r.push_back('\n');
|
|
dst->Append(r);
|
|
WriteBatchItemPrinter batch_item_printer;
|
|
batch_item_printer.dst_ = dst;
|
|
Status s = batch.Iterate(&batch_item_printer);
|
|
if (!s.ok()) {
|
|
dst->Append(" error: " + s.ToString() + "\n");
|
|
}
|
|
}
|
|
|
|
Status DumpLog(Env* env, const std::string& fname, WritableFile* dst) {
|
|
return PrintLogContents(env, fname, WriteBatchPrinter, dst);
|
|
}
|
|
|
|
// Called on every log record (each one of which is a WriteBatch)
|
|
// found in a kDescriptorFile.
|
|
static void VersionEditPrinter(uint64_t pos, Slice record, WritableFile* dst) {
|
|
std::string r = "--- offset ";
|
|
AppendNumberTo(&r, pos);
|
|
r += "; ";
|
|
VersionEdit edit;
|
|
Status s = edit.DecodeFrom(record);
|
|
if (!s.ok()) {
|
|
r += s.ToString();
|
|
r.push_back('\n');
|
|
} else {
|
|
r += edit.DebugString();
|
|
}
|
|
dst->Append(r);
|
|
}
|
|
|
|
Status DumpDescriptor(Env* env, const std::string& fname, WritableFile* dst) {
|
|
return PrintLogContents(env, fname, VersionEditPrinter, dst);
|
|
}
|
|
|
|
Status DumpTable(Env* env, const std::string& fname, WritableFile* dst) {
|
|
uint64_t file_size;
|
|
RandomAccessFile* file = nullptr;
|
|
Table* table = nullptr;
|
|
Status s = env->GetFileSize(fname, &file_size);
|
|
if (s.ok()) {
|
|
s = env->NewRandomAccessFile(fname, &file);
|
|
}
|
|
if (s.ok()) {
|
|
// We use the default comparator, which may or may not match the
|
|
// comparator used in this database. However this should not cause
|
|
// problems since we only use Table operations that do not require
|
|
// any comparisons. In particular, we do not call Seek or Prev.
|
|
s = Table::Open(Options(), file, file_size, &table);
|
|
}
|
|
if (!s.ok()) {
|
|
delete table;
|
|
delete file;
|
|
return s;
|
|
}
|
|
|
|
ReadOptions ro;
|
|
ro.fill_cache = false;
|
|
Iterator* iter = table->NewIterator(ro);
|
|
std::string r;
|
|
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
|
|
r.clear();
|
|
ParsedInternalKey key;
|
|
if (!ParseInternalKey(iter->key(), &key)) {
|
|
r = "badkey '";
|
|
AppendEscapedStringTo(&r, iter->key());
|
|
r += "' => '";
|
|
AppendEscapedStringTo(&r, iter->value());
|
|
r += "'\n";
|
|
dst->Append(r);
|
|
} else {
|
|
r = "'";
|
|
AppendEscapedStringTo(&r, key.user_key);
|
|
r += "' @ ";
|
|
AppendNumberTo(&r, key.sequence);
|
|
r += " : ";
|
|
if (key.type == kTypeDeletion) {
|
|
r += "del";
|
|
} else if (key.type == kTypeValue) {
|
|
r += "val";
|
|
} else {
|
|
AppendNumberTo(&r, key.type);
|
|
}
|
|
r += " => '";
|
|
AppendEscapedStringTo(&r, iter->value());
|
|
r += "'\n";
|
|
dst->Append(r);
|
|
}
|
|
}
|
|
s = iter->status();
|
|
if (!s.ok()) {
|
|
dst->Append("iterator error: " + s.ToString() + "\n");
|
|
}
|
|
|
|
delete iter;
|
|
delete table;
|
|
delete file;
|
|
return Status::OK();
|
|
}
|
|
|
|
} // namespace
|
|
|
|
Status DumpFile(Env* env, const std::string& fname, WritableFile* dst) {
|
|
FileType ftype;
|
|
if (!GuessType(fname, &ftype)) {
|
|
return Status::InvalidArgument(fname + ": unknown file type");
|
|
}
|
|
switch (ftype) {
|
|
case kLogFile:
|
|
return DumpLog(env, fname, dst);
|
|
case kDescriptorFile:
|
|
return DumpDescriptor(env, fname, dst);
|
|
case kTableFile:
|
|
return DumpTable(env, fname, dst);
|
|
default:
|
|
break;
|
|
}
|
|
return Status::InvalidArgument(fname + ": not a dump-able file type");
|
|
}
|
|
|
|
} // namespace leveldb
|