rocksdb/util/testutil.cc

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// 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 "util/testutil.h"
#include "port/port.h"
#include "util/file_reader_writer.h"
#include "util/random.h"
namespace rocksdb {
namespace test {
Slice RandomString(Random* rnd, int len, std::string* dst) {
dst->resize(len);
for (int i = 0; i < len; i++) {
(*dst)[i] = static_cast<char>(' ' + rnd->Uniform(95)); // ' ' .. '~'
}
return Slice(*dst);
}
extern std::string RandomHumanReadableString(Random* rnd, int len) {
std::string ret;
ret.resize(len);
for (int i = 0; i < len; ++i) {
ret[i] = static_cast<char>('a' + rnd->Uniform(26));
}
return ret;
}
std::string RandomKey(Random* rnd, int len) {
// Make sure to generate a wide variety of characters so we
// test the boundary conditions for short-key optimizations.
static const char kTestChars[] = {
'\0', '\1', 'a', 'b', 'c', 'd', 'e', '\xfd', '\xfe', '\xff'
};
std::string result;
for (int i = 0; i < len; i++) {
result += kTestChars[rnd->Uniform(sizeof(kTestChars))];
}
return result;
}
extern Slice CompressibleString(Random* rnd, double compressed_fraction,
int len, std::string* dst) {
int raw = static_cast<int>(len * compressed_fraction);
if (raw < 1) raw = 1;
std::string raw_data;
RandomString(rnd, raw, &raw_data);
// Duplicate the random data until we have filled "len" bytes
dst->clear();
while (dst->size() < (unsigned int)len) {
dst->append(raw_data);
}
dst->resize(len);
return Slice(*dst);
}
namespace {
class Uint64ComparatorImpl : public Comparator {
public:
Uint64ComparatorImpl() { }
virtual const char* Name() const override {
return "rocksdb.Uint64Comparator";
}
virtual int Compare(const Slice& a, const Slice& b) const override {
assert(a.size() == sizeof(uint64_t) && b.size() == sizeof(uint64_t));
const uint64_t* left = reinterpret_cast<const uint64_t*>(a.data());
const uint64_t* right = reinterpret_cast<const uint64_t*>(b.data());
if (*left == *right) {
return 0;
} else if (*left < *right) {
return -1;
} else {
return 1;
}
}
virtual void FindShortestSeparator(std::string* start,
const Slice& limit) const override {
return;
}
virtual void FindShortSuccessor(std::string* key) const override {
return;
}
};
} // namespace
static port::OnceType once = LEVELDB_ONCE_INIT;
static const Comparator* uint64comp;
static void InitModule() {
uint64comp = new Uint64ComparatorImpl;
}
const Comparator* Uint64Comparator() {
port::InitOnce(&once, InitModule);
return uint64comp;
}
WritableFileWriter* GetWritableFileWriter(WritableFile* wf) {
unique_ptr<WritableFile> file(wf);
return new WritableFileWriter(std::move(file), EnvOptions());
}
RandomAccessFileReader* GetRandomAccessFileReader(RandomAccessFile* raf) {
unique_ptr<RandomAccessFile> file(raf);
return new RandomAccessFileReader(std::move(file));
}
SequentialFileReader* GetSequentialFileReader(SequentialFile* se) {
unique_ptr<SequentialFile> file(se);
return new SequentialFileReader(std::move(file));
}
} // namespace test
} // namespace rocksdb