1// Copyright (c) 2011 The LevelDB Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. See the AUTHORS file for names of contributors. 4 5#ifndef STORAGE_LEVELDB_UTIL_TESTUTIL_H_ 6#define STORAGE_LEVELDB_UTIL_TESTUTIL_H_ 7 8#include "leveldb/env.h" 9#include "leveldb/slice.h" 10#include "util/random.h" 11 12namespace leveldb { 13namespace test { 14 15// Store in *dst a random string of length "len" and return a Slice that 16// references the generated data. 17extern Slice RandomString(Random* rnd, int len, std::string* dst); 18 19// Return a random key with the specified length that may contain interesting 20// characters (e.g. \x00, \xff, etc.). 21extern std::string RandomKey(Random* rnd, int len); 22 23// Store in *dst a string of length "len" that will compress to 24// "N*compressed_fraction" bytes and return a Slice that references 25// the generated data. 26extern Slice CompressibleString(Random* rnd, double compressed_fraction, 27 size_t len, std::string* dst); 28 29// A wrapper that allows injection of errors. 30class ErrorEnv : public EnvWrapper { 31 public: 32 bool writable_file_error_; 33 int num_writable_file_errors_; 34 35 ErrorEnv() : EnvWrapper(Env::Default()), 36 writable_file_error_(false), 37 num_writable_file_errors_(0) { } 38 39 virtual Status NewWritableFile(const std::string& fname, 40 WritableFile** result) { 41 if (writable_file_error_) { 42 ++num_writable_file_errors_; 43 *result = NULL; 44 return Status::IOError(fname, "fake error"); 45 } 46 return target()->NewWritableFile(fname, result); 47 } 48}; 49 50} // namespace test 51} // namespace leveldb 52 53#endif // STORAGE_LEVELDB_UTIL_TESTUTIL_H_ 54