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#include "helpers/memenv/memenv.h"
6
7#include "db/db_impl.h"
8#include "leveldb/db.h"
9#include "leveldb/env.h"
10#include "util/testharness.h"
11#include <string>
12#include <vector>
13
14namespace leveldb {
15
16class MemEnvTest {
17 public:
18  Env* env_;
19
20  MemEnvTest()
21      : env_(NewMemEnv(Env::Default())) {
22  }
23  ~MemEnvTest() {
24    delete env_;
25  }
26};
27
28TEST(MemEnvTest, Basics) {
29  uint64_t file_size;
30  WritableFile* writable_file;
31  std::vector<std::string> children;
32
33  ASSERT_OK(env_->CreateDir("/dir"));
34
35  // Check that the directory is empty.
36  ASSERT_TRUE(!env_->FileExists("/dir/non_existent"));
37  ASSERT_TRUE(!env_->GetFileSize("/dir/non_existent", &file_size).ok());
38  ASSERT_OK(env_->GetChildren("/dir", &children));
39  ASSERT_EQ(0, children.size());
40
41  // Create a file.
42  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file));
43  delete writable_file;
44
45  // Check that the file exists.
46  ASSERT_TRUE(env_->FileExists("/dir/f"));
47  ASSERT_OK(env_->GetFileSize("/dir/f", &file_size));
48  ASSERT_EQ(0, file_size);
49  ASSERT_OK(env_->GetChildren("/dir", &children));
50  ASSERT_EQ(1, children.size());
51  ASSERT_EQ("f", children[0]);
52
53  // Write to the file.
54  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file));
55  ASSERT_OK(writable_file->Append("abc"));
56  delete writable_file;
57
58  // Check for expected size.
59  ASSERT_OK(env_->GetFileSize("/dir/f", &file_size));
60  ASSERT_EQ(3, file_size);
61
62  // Check that renaming works.
63  ASSERT_TRUE(!env_->RenameFile("/dir/non_existent", "/dir/g").ok());
64  ASSERT_OK(env_->RenameFile("/dir/f", "/dir/g"));
65  ASSERT_TRUE(!env_->FileExists("/dir/f"));
66  ASSERT_TRUE(env_->FileExists("/dir/g"));
67  ASSERT_OK(env_->GetFileSize("/dir/g", &file_size));
68  ASSERT_EQ(3, file_size);
69
70  // Check that opening non-existent file fails.
71  SequentialFile* seq_file;
72  RandomAccessFile* rand_file;
73  ASSERT_TRUE(!env_->NewSequentialFile("/dir/non_existent", &seq_file).ok());
74  ASSERT_TRUE(!seq_file);
75  ASSERT_TRUE(!env_->NewRandomAccessFile("/dir/non_existent", &rand_file).ok());
76  ASSERT_TRUE(!rand_file);
77
78  // Check that deleting works.
79  ASSERT_TRUE(!env_->DeleteFile("/dir/non_existent").ok());
80  ASSERT_OK(env_->DeleteFile("/dir/g"));
81  ASSERT_TRUE(!env_->FileExists("/dir/g"));
82  ASSERT_OK(env_->GetChildren("/dir", &children));
83  ASSERT_EQ(0, children.size());
84  ASSERT_OK(env_->DeleteDir("/dir"));
85}
86
87TEST(MemEnvTest, ReadWrite) {
88  WritableFile* writable_file;
89  SequentialFile* seq_file;
90  RandomAccessFile* rand_file;
91  Slice result;
92  char scratch[100];
93
94  ASSERT_OK(env_->CreateDir("/dir"));
95
96  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file));
97  ASSERT_OK(writable_file->Append("hello "));
98  ASSERT_OK(writable_file->Append("world"));
99  delete writable_file;
100
101  // Read sequentially.
102  ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file));
103  ASSERT_OK(seq_file->Read(5, &result, scratch)); // Read "hello".
104  ASSERT_EQ(0, result.compare("hello"));
105  ASSERT_OK(seq_file->Skip(1));
106  ASSERT_OK(seq_file->Read(1000, &result, scratch)); // Read "world".
107  ASSERT_EQ(0, result.compare("world"));
108  ASSERT_OK(seq_file->Read(1000, &result, scratch)); // Try reading past EOF.
109  ASSERT_EQ(0, result.size());
110  ASSERT_OK(seq_file->Skip(100)); // Try to skip past end of file.
111  ASSERT_OK(seq_file->Read(1000, &result, scratch));
112  ASSERT_EQ(0, result.size());
113  delete seq_file;
114
115  // Random reads.
116  ASSERT_OK(env_->NewRandomAccessFile("/dir/f", &rand_file));
117  ASSERT_OK(rand_file->Read(6, 5, &result, scratch)); // Read "world".
118  ASSERT_EQ(0, result.compare("world"));
119  ASSERT_OK(rand_file->Read(0, 5, &result, scratch)); // Read "hello".
120  ASSERT_EQ(0, result.compare("hello"));
121  ASSERT_OK(rand_file->Read(10, 100, &result, scratch)); // Read "d".
122  ASSERT_EQ(0, result.compare("d"));
123
124  // Too high offset.
125  ASSERT_TRUE(!rand_file->Read(1000, 5, &result, scratch).ok());
126  delete rand_file;
127}
128
129TEST(MemEnvTest, Locks) {
130  FileLock* lock;
131
132  // These are no-ops, but we test they return success.
133  ASSERT_OK(env_->LockFile("some file", &lock));
134  ASSERT_OK(env_->UnlockFile(lock));
135}
136
137TEST(MemEnvTest, Misc) {
138  std::string test_dir;
139  ASSERT_OK(env_->GetTestDirectory(&test_dir));
140  ASSERT_TRUE(!test_dir.empty());
141
142  WritableFile* writable_file;
143  ASSERT_OK(env_->NewWritableFile("/a/b", &writable_file));
144
145  // These are no-ops, but we test they return success.
146  ASSERT_OK(writable_file->Sync());
147  ASSERT_OK(writable_file->Flush());
148  ASSERT_OK(writable_file->Close());
149  delete writable_file;
150}
151
152TEST(MemEnvTest, LargeWrite) {
153  const size_t kWriteSize = 300 * 1024;
154  char* scratch = new char[kWriteSize * 2];
155
156  std::string write_data;
157  for (size_t i = 0; i < kWriteSize; ++i) {
158    write_data.append(1, static_cast<char>(i));
159  }
160
161  WritableFile* writable_file;
162  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file));
163  ASSERT_OK(writable_file->Append("foo"));
164  ASSERT_OK(writable_file->Append(write_data));
165  delete writable_file;
166
167  SequentialFile* seq_file;
168  Slice result;
169  ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file));
170  ASSERT_OK(seq_file->Read(3, &result, scratch)); // Read "foo".
171  ASSERT_EQ(0, result.compare("foo"));
172
173  size_t read = 0;
174  std::string read_data;
175  while (read < kWriteSize) {
176    ASSERT_OK(seq_file->Read(kWriteSize - read, &result, scratch));
177    read_data.append(result.data(), result.size());
178    read += result.size();
179  }
180  ASSERT_TRUE(write_data == read_data);
181  delete seq_file;
182  delete [] scratch;
183}
184
185TEST(MemEnvTest, DBTest) {
186  Options options;
187  options.create_if_missing = true;
188  options.env = env_;
189  DB* db;
190
191  const Slice keys[] = {Slice("aaa"), Slice("bbb"), Slice("ccc")};
192  const Slice vals[] = {Slice("foo"), Slice("bar"), Slice("baz")};
193
194  ASSERT_OK(DB::Open(options, "/dir/db", &db));
195  for (size_t i = 0; i < 3; ++i) {
196    ASSERT_OK(db->Put(WriteOptions(), keys[i], vals[i]));
197  }
198
199  for (size_t i = 0; i < 3; ++i) {
200    std::string res;
201    ASSERT_OK(db->Get(ReadOptions(), keys[i], &res));
202    ASSERT_TRUE(res == vals[i]);
203  }
204
205  Iterator* iterator = db->NewIterator(ReadOptions());
206  iterator->SeekToFirst();
207  for (size_t i = 0; i < 3; ++i) {
208    ASSERT_TRUE(iterator->Valid());
209    ASSERT_TRUE(keys[i] == iterator->key());
210    ASSERT_TRUE(vals[i] == iterator->value());
211    iterator->Next();
212  }
213  ASSERT_TRUE(!iterator->Valid());
214  delete iterator;
215
216  DBImpl* dbi = reinterpret_cast<DBImpl*>(db);
217  ASSERT_OK(dbi->TEST_CompactMemTable());
218
219  for (size_t i = 0; i < 3; ++i) {
220    std::string res;
221    ASSERT_OK(db->Get(ReadOptions(), keys[i], &res));
222    ASSERT_TRUE(res == vals[i]);
223  }
224
225  delete db;
226}
227
228}  // namespace leveldb
229
230int main(int argc, char** argv) {
231  return leveldb::test::RunAllTests();
232}
233