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378 lignes
10 KiB
378 lignes
10 KiB
// 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 "leveldb/db.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "leveldb/cache.h"
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#include "leveldb/env.h"
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#include "leveldb/table.h"
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#include "leveldb/write_batch.h"
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#include "db/db_impl.h"
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#include "db/filename.h"
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#include "db/log_format.h"
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#include "db/version_set.h"
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#include "util/logging.h"
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#include "util/testharness.h"
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#include "util/testutil.h"
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namespace leveldb {
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static const int kValueSize = 1000;
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class CorruptionTest {
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public:
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test::ErrorEnv env_;
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Random rnd_;
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std::string dbname_;
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Cache* tiny_cache_;
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Options options_;
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DB* db_;
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CorruptionTest() : rnd_(test::RandomSeed()) {
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tiny_cache_ = NewLRUCache(100);
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options_.env = &env_;
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dbname_ = test::TmpDir() + "/db_test";
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DestroyDB(dbname_, options_);
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db_ = NULL;
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options_.create_if_missing = true;
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Reopen();
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options_.create_if_missing = false;
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}
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~CorruptionTest() {
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delete db_;
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DestroyDB(dbname_, Options());
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delete tiny_cache_;
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}
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Status TryReopen(Options* options = NULL) {
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delete db_;
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db_ = NULL;
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Options opt = (options ? *options : options_);
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opt.env = &env_;
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opt.block_cache = tiny_cache_;
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return DB::Open(opt, dbname_, &db_);
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}
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void Reopen(Options* options = NULL) {
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ASSERT_OK(TryReopen(options));
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}
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void RepairDB() {
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delete db_;
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db_ = NULL;
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ASSERT_OK(::leveldb::RepairDB(dbname_, options_));
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}
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void Build(int n) {
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std::string key_space, value_space;
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WriteBatch batch;
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for (int i = 0; i < n; i++) {
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//if ((i % 100) == 0) fprintf(stderr, "@ %d of %d\n", i, n);
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Slice key = Key(i, &key_space);
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batch.Clear();
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batch.Put(key, Value(i, &value_space));
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ASSERT_OK(db_->Write(WriteOptions(), &batch));
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}
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}
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void Check(int min_expected, int max_expected) {
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int next_expected = 0;
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int missed = 0;
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int bad_keys = 0;
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int bad_values = 0;
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int correct = 0;
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std::string value_space;
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Iterator* iter = db_->NewIterator(ReadOptions());
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for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
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uint64_t key;
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Slice in(iter->key());
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if (!ConsumeDecimalNumber(&in, &key) ||
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!in.empty() ||
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key < next_expected) {
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bad_keys++;
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continue;
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}
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missed += (key - next_expected);
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next_expected = key + 1;
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if (iter->value() != Value(key, &value_space)) {
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bad_values++;
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} else {
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correct++;
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}
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}
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delete iter;
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fprintf(stderr,
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"expected=%d..%d; got=%d; bad_keys=%d; bad_values=%d; missed=%d\n",
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min_expected, max_expected, correct, bad_keys, bad_values, missed);
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ASSERT_LE(min_expected, correct);
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ASSERT_GE(max_expected, correct);
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}
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void Corrupt(FileType filetype, int offset, int bytes_to_corrupt) {
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// Pick file to corrupt
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std::vector<std::string> filenames;
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ASSERT_OK(env_.GetChildren(dbname_, &filenames));
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uint64_t number;
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LargeValueRef large_ref;
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FileType type;
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std::vector<std::string> candidates;
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for (int i = 0; i < filenames.size(); i++) {
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if (ParseFileName(filenames[i], &number, &large_ref, &type) &&
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type == filetype) {
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candidates.push_back(dbname_ + "/" + filenames[i]);
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}
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}
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ASSERT_TRUE(!candidates.empty()) << filetype;
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std::string fname = candidates[rnd_.Uniform(candidates.size())];
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struct stat sbuf;
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if (stat(fname.c_str(), &sbuf) != 0) {
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const char* msg = strerror(errno);
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ASSERT_TRUE(false) << fname << ": " << msg;
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}
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if (offset < 0) {
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// Relative to end of file; make it absolute
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if (-offset > sbuf.st_size) {
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offset = 0;
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} else {
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offset = sbuf.st_size + offset;
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}
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}
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if (offset > sbuf.st_size) {
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offset = sbuf.st_size;
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}
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if (offset + bytes_to_corrupt > sbuf.st_size) {
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bytes_to_corrupt = sbuf.st_size - offset;
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}
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// Do it
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std::string contents;
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Status s = ReadFileToString(Env::Default(), fname, &contents);
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ASSERT_TRUE(s.ok()) << s.ToString();
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for (int i = 0; i < bytes_to_corrupt; i++) {
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contents[i + offset] ^= 0x80;
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}
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s = WriteStringToFile(Env::Default(), contents, fname);
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ASSERT_TRUE(s.ok()) << s.ToString();
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}
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int Property(const std::string& name) {
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std::string property;
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int result;
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if (db_->GetProperty(name, &property) &&
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sscanf(property.c_str(), "%d", &result) == 1) {
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return result;
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} else {
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return -1;
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}
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}
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// Return the ith key
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Slice Key(int i, std::string* storage) {
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char buf[100];
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snprintf(buf, sizeof(buf), "%016d", i);
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storage->assign(buf, strlen(buf));
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return Slice(*storage);
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}
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// Return the value to associate with the specified key
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Slice Value(int k, std::string* storage) {
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Random r(k);
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return test::RandomString(&r, kValueSize, storage);
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}
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};
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TEST(CorruptionTest, Recovery) {
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Build(100);
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Check(100, 100);
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Corrupt(kLogFile, 19, 1); // WriteBatch tag for first record
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Corrupt(kLogFile, log::kBlockSize + 1000, 1); // Somewhere in second block
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Reopen();
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// The 64 records in the first two log blocks are completely lost.
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Check(36, 36);
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}
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TEST(CorruptionTest, RecoverWriteError) {
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env_.writable_file_error_ = true;
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Status s = TryReopen();
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ASSERT_TRUE(!s.ok());
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}
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TEST(CorruptionTest, NewFileErrorDuringWrite) {
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// Do enough writing to force minor compaction
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env_.writable_file_error_ = true;
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const int num = 3 + (Options().write_buffer_size / kValueSize);
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std::string value_storage;
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Status s;
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for (int i = 0; s.ok() && i < num; i++) {
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WriteBatch batch;
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batch.Put("a", Value(100, &value_storage));
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s = db_->Write(WriteOptions(), &batch);
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}
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ASSERT_TRUE(!s.ok());
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ASSERT_GE(env_.num_writable_file_errors_, 1);
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env_.writable_file_error_ = false;
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Reopen();
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}
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TEST(CorruptionTest, TableFile) {
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Build(100);
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DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
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dbi->TEST_CompactMemTable();
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dbi->TEST_CompactRange(0, "", "~");
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dbi->TEST_CompactRange(1, "", "~");
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Corrupt(kTableFile, 100, 1);
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Check(99, 99);
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}
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TEST(CorruptionTest, TableFileIndexData) {
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Build(10000); // Enough to build multiple Tables
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DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
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dbi->TEST_CompactMemTable();
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dbi->TEST_CompactRange(0, "", "~");
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dbi->TEST_CompactRange(1, "", "~");
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Corrupt(kTableFile, -2000, 500);
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Reopen();
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Check(5000, 9999);
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}
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TEST(CorruptionTest, MissingDescriptor) {
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Build(1000);
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RepairDB();
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Reopen();
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Check(1000, 1000);
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}
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TEST(CorruptionTest, SequenceNumberRecovery) {
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ASSERT_OK(db_->Put(WriteOptions(), "foo", "v1"));
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ASSERT_OK(db_->Put(WriteOptions(), "foo", "v2"));
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ASSERT_OK(db_->Put(WriteOptions(), "foo", "v3"));
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ASSERT_OK(db_->Put(WriteOptions(), "foo", "v4"));
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ASSERT_OK(db_->Put(WriteOptions(), "foo", "v5"));
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RepairDB();
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Reopen();
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std::string v;
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ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
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ASSERT_EQ("v5", v);
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// Write something. If sequence number was not recovered properly,
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// it will be hidden by an earlier write.
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ASSERT_OK(db_->Put(WriteOptions(), "foo", "v6"));
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ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
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ASSERT_EQ("v6", v);
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Reopen();
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ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
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ASSERT_EQ("v6", v);
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}
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TEST(CorruptionTest, LargeValueRecovery) {
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Options options;
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options.large_value_threshold = 10000;
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Reopen(&options);
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Random rnd(301);
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std::string big;
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ASSERT_OK(db_->Put(WriteOptions(),
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"foo", test::RandomString(&rnd, 100000, &big)));
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std::string v;
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ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
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ASSERT_EQ(big, v);
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RepairDB();
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Reopen();
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ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
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ASSERT_EQ(big, v);
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Reopen();
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ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
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ASSERT_EQ(big, v);
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}
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TEST(CorruptionTest, CorruptedDescriptor) {
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ASSERT_OK(db_->Put(WriteOptions(), "foo", "hello"));
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DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
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dbi->TEST_CompactMemTable();
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dbi->TEST_CompactRange(0, "", "~");
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Corrupt(kDescriptorFile, 0, 1000);
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Status s = TryReopen();
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ASSERT_TRUE(!s.ok());
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RepairDB();
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Reopen();
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std::string v;
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ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
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ASSERT_EQ("hello", v);
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}
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TEST(CorruptionTest, CompactionInputError) {
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Build(10);
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DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
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dbi->TEST_CompactMemTable();
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ASSERT_EQ(1, Property("leveldb.num-files-at-level0"));
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Corrupt(kTableFile, 100, 1);
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Check(9, 9);
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// Force compactions by writing lots of values
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Build(10000);
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Check(10000, 10000);
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dbi->TEST_CompactRange(0, "", "~");
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ASSERT_EQ(0, Property("leveldb.num-files-at-level0"));
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}
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TEST(CorruptionTest, CompactionInputErrorParanoid) {
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Options options;
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options.paranoid_checks = true;
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options.write_buffer_size = 1048576;
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Reopen(&options);
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Build(10);
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DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
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dbi->TEST_CompactMemTable();
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ASSERT_EQ(1, Property("leveldb.num-files-at-level0"));
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Corrupt(kTableFile, 100, 1);
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Check(9, 9);
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// Write must eventually fail because of corrupted table
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Status s;
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std::string tmp1, tmp2;
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for (int i = 0; i < 10000 && s.ok(); i++) {
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s = db_->Put(WriteOptions(), Key(i, &tmp1), Value(i, &tmp2));
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}
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ASSERT_TRUE(!s.ok()) << "write did not fail in corrupted paranoid db";
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}
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TEST(CorruptionTest, UnrelatedKeys) {
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Build(10);
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DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
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dbi->TEST_CompactMemTable();
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Corrupt(kTableFile, 100, 1);
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std::string tmp1, tmp2;
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ASSERT_OK(db_->Put(WriteOptions(), Key(1000, &tmp1), Value(1000, &tmp2)));
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std::string v;
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ASSERT_OK(db_->Get(ReadOptions(), Key(1000, &tmp1), &v));
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ASSERT_EQ(Value(1000, &tmp2).ToString(), v);
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dbi->TEST_CompactMemTable();
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ASSERT_OK(db_->Get(ReadOptions(), Key(1000, &tmp1), &v));
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ASSERT_EQ(Value(1000, &tmp2).ToString(), v);
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}
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}
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int main(int argc, char** argv) {
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return leveldb::test::RunAllTests();
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}
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