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rocksdb/table/mock_table.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "table/mock_table.h"
#include "db/dbformat.h"
#include "env/composite_env_wrapper.h"
#include "file/random_access_file_reader.h"
#include "port/port.h"
#include "rocksdb/table_properties.h"
#include "table/get_context.h"
#include "util/coding.h"
namespace ROCKSDB_NAMESPACE {
namespace mock {
KVVector MakeMockFile(std::initializer_list<KVPair> l) { return KVVector(l); }
void SortKVVector(KVVector* kv_vector, const Comparator* ucmp) {
InternalKeyComparator icmp(ucmp);
std::sort(kv_vector->begin(), kv_vector->end(),
[icmp](KVPair a, KVPair b) -> bool {
return icmp.Compare(a.first, b.first) < 0;
});
}
class MockTableReader : public TableReader {
public:
explicit MockTableReader(const KVVector& table) : table_(table) {}
InternalIterator* NewIterator(const ReadOptions&,
const SliceTransform* prefix_extractor,
Arena* arena, bool skip_filters,
TableReaderCaller caller,
size_t compaction_readahead_size = 0,
bool allow_unprepared_value = false) override;
Status Get(const ReadOptions& readOptions, const Slice& key,
GetContext* get_context, const SliceTransform* prefix_extractor,
bool skip_filters = false) override;
uint64_t ApproximateOffsetOf(const Slice& /*key*/,
TableReaderCaller /*caller*/) override {
return 0;
}
uint64_t ApproximateSize(const Slice& /*start*/, const Slice& /*end*/,
TableReaderCaller /*caller*/) override {
return 0;
}
size_t ApproximateMemoryUsage() const override { return 0; }
void SetupForCompaction() override {}
std::shared_ptr<const TableProperties> GetTableProperties() const override;
~MockTableReader() {}
private:
const KVVector& table_;
};
class MockTableIterator : public InternalIterator {
public:
explicit MockTableIterator(const KVVector& table) : table_(table) {
itr_ = table_.end();
}
bool Valid() const override { return itr_ != table_.end(); }
void SeekToFirst() override { itr_ = table_.begin(); }
void SeekToLast() override {
itr_ = table_.end();
--itr_;
}
void Seek(const Slice& target) override {
KVPair target_pair(target.ToString(), "");
InternalKeyComparator icmp(BytewiseComparator());
itr_ = std::lower_bound(table_.begin(), table_.end(), target_pair,
[icmp](KVPair a, KVPair b) -> bool {
return icmp.Compare(a.first, b.first) < 0;
});
}
void SeekForPrev(const Slice& target) override {
KVPair target_pair(target.ToString(), "");
InternalKeyComparator icmp(BytewiseComparator());
itr_ = std::upper_bound(table_.begin(), table_.end(), target_pair,
[icmp](KVPair a, KVPair b) -> bool {
return icmp.Compare(a.first, b.first) < 0;
});
Prev();
}
void Next() override { ++itr_; }
void Prev() override {
if (itr_ == table_.begin()) {
itr_ = table_.end();
} else {
--itr_;
}
}
Slice key() const override { return Slice(itr_->first); }
Slice value() const override { return Slice(itr_->second); }
Status status() const override { return Status::OK(); }
private:
const KVVector& table_;
KVVector::const_iterator itr_;
};
class MockTableBuilder : public TableBuilder {
public:
MockTableBuilder(uint32_t id, MockTableFileSystem* file_system,
MockTableFactory::MockCorruptionMode corrupt_mode =
MockTableFactory::kCorruptNone)
: id_(id), file_system_(file_system), corrupt_mode_(corrupt_mode) {
table_ = MakeMockFile({});
}
// REQUIRES: Either Finish() or Abandon() has been called.
~MockTableBuilder() {}
// Add key,value to the table being constructed.
// REQUIRES: key is after any previously added key according to comparator.
// REQUIRES: Finish(), Abandon() have not been called
void Add(const Slice& key, const Slice& value) override {
if (corrupt_mode_ == MockTableFactory::kCorruptValue) {
// Corrupt the value
table_.push_back({key.ToString(), value.ToString() + " "});
corrupt_mode_ = MockTableFactory::kCorruptNone;
} else if (corrupt_mode_ == MockTableFactory::kCorruptKey) {
table_.push_back({key.ToString() + " ", value.ToString()});
corrupt_mode_ = MockTableFactory::kCorruptNone;
} else if (corrupt_mode_ == MockTableFactory::kCorruptReorderKey) {
if (prev_key_.empty()) {
prev_key_ = key.ToString();
prev_value_ = value.ToString();
} else {
table_.push_back({key.ToString(), value.ToString()});
table_.push_back({prev_key_, prev_value_});
corrupt_mode_ = MockTableFactory::kCorruptNone;
}
} else {
table_.push_back({key.ToString(), value.ToString()});
}
}
// Return non-ok iff some error has been detected.
Status status() const override { return Status::OK(); }
// Return non-ok iff some error happens during IO.
IOStatus io_status() const override { return IOStatus::OK(); }
Status Finish() override {
MutexLock lock_guard(&file_system_->mutex);
file_system_->files.insert({id_, table_});
return Status::OK();
}
void Abandon() override {}
uint64_t NumEntries() const override { return table_.size(); }
uint64_t FileSize() const override { return table_.size(); }
TableProperties GetTableProperties() const override {
return TableProperties();
}
// Get file checksum
std::string GetFileChecksum() const override { return kUnknownFileChecksum; }
// Get file checksum function name
const char* GetFileChecksumFuncName() const override {
return kUnknownFileChecksumFuncName;
}
private:
uint32_t id_;
std::string prev_key_;
std::string prev_value_;
MockTableFileSystem* file_system_;
int corrupt_mode_;
KVVector table_;
};
InternalIterator* MockTableReader::NewIterator(
const ReadOptions&, const SliceTransform* /* prefix_extractor */,
Arena* /*arena*/, bool /*skip_filters*/, TableReaderCaller /*caller*/,
size_t /*compaction_readahead_size*/, bool /* allow_unprepared_value */) {
return new MockTableIterator(table_);
}
Status MockTableReader::Get(const ReadOptions&, const Slice& key,
GetContext* get_context,
const SliceTransform* /*prefix_extractor*/,
bool /*skip_filters*/) {
std::unique_ptr<MockTableIterator> iter(new MockTableIterator(table_));
for (iter->Seek(key); iter->Valid(); iter->Next()) {
ParsedInternalKey parsed_key;
Status pik_status =
ParseInternalKey(iter->key(), &parsed_key, true /* log_err_key */);
if (!pik_status.ok()) {
return pik_status;
}
bool dont_care __attribute__((__unused__));
if (!get_context->SaveValue(parsed_key, iter->value(), &dont_care)) {
break;
}
}
return Status::OK();
}
std::shared_ptr<const TableProperties> MockTableReader::GetTableProperties()
const {
return std::shared_ptr<const TableProperties>(new TableProperties());
}
MockTableFactory::MockTableFactory()
: next_id_(1), corrupt_mode_(MockTableFactory::kCorruptNone) {}
Status MockTableFactory::NewTableReader(
const ReadOptions& /*ro*/,
const TableReaderOptions& /*table_reader_options*/,
std::unique_ptr<RandomAccessFileReader>&& file, uint64_t /*file_size*/,
std::unique_ptr<TableReader>* table_reader,
bool /*prefetch_index_and_filter_in_cache*/) const {
uint32_t id;
Status s = GetIDFromFile(file.get(), &id);
if (!s.ok()) {
return s;
}
MutexLock lock_guard(&file_system_.mutex);
auto it = file_system_.files.find(id);
if (it == file_system_.files.end()) {
return Status::IOError("Mock file not found");
}
table_reader->reset(new MockTableReader(it->second));
return Status::OK();
}
TableBuilder* MockTableFactory::NewTableBuilder(
const TableBuilderOptions& /*table_builder_options*/,
WritableFileWriter* file) const {
uint32_t id;
Status s = GetAndWriteNextID(file, &id);
assert(s.ok());
return new MockTableBuilder(id, &file_system_, corrupt_mode_);
}
Status MockTableFactory::CreateMockTable(Env* env, const std::string& fname,
KVVector file_contents) {
std::unique_ptr<WritableFileWriter> file_writer;
auto s = WritableFileWriter::Create(env->GetFileSystem(), fname,
FileOptions(), &file_writer, nullptr);
if (!s.ok()) {
return s;
}
uint32_t id;
s = GetAndWriteNextID(file_writer.get(), &id);
if (s.ok()) {
file_system_.files.insert({id, std::move(file_contents)});
}
return s;
}
Status MockTableFactory::GetAndWriteNextID(WritableFileWriter* file,
uint32_t* next_id) const {
*next_id = next_id_.fetch_add(1);
char buf[4];
EncodeFixed32(buf, *next_id);
return file->Append(Slice(buf, 4));
}
Status MockTableFactory::GetIDFromFile(RandomAccessFileReader* file,
uint32_t* id) const {
char buf[4];
Slice result;
Status s = file->Read(IOOptions(), 0, 4, &result, buf, nullptr);
assert(result.size() == 4);
*id = DecodeFixed32(buf);
return s;
}
void MockTableFactory::AssertSingleFile(const KVVector& file_contents) {
ASSERT_EQ(file_system_.files.size(), 1U);
ASSERT_EQ(file_contents, file_system_.files.begin()->second);
}
void MockTableFactory::AssertLatestFile(const KVVector& file_contents) {
ASSERT_GE(file_system_.files.size(), 1U);
auto latest = file_system_.files.end();
--latest;
if (file_contents != latest->second) {
std::cout << "Wrong content! Content of latest file:" << std::endl;
for (const auto& kv : latest->second) {
ParsedInternalKey ikey;
std::string key, value;
std::tie(key, value) = kv;
ASSERT_OK(ParseInternalKey(Slice(key), &ikey, true /* log_err_key */));
std::cout << ikey.DebugString(true, false) << " -> " << value
<< std::endl;
}
FAIL();
}
}
} // namespace mock
} // namespace ROCKSDB_NAMESPACE