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// 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 "leveldb/env.h"
#include <algorithm>
#include <atomic>
#include "port/port.h"
#include "port/thread_annotations.h"
#include "util/mutexlock.h"
#include "util/testharness.h"
#include "util/testutil.h"
namespace leveldb {
static const int kDelayMicros = 100000;
class EnvTest {
public:
EnvTest() : env_(Env::Default()) {}
Env* env_;
};
namespace {
static void SetAtomicBool(void* atomic_bool_ptr) {
std::atomic<bool>* atomic_bool =
reinterpret_cast<std::atomic<bool>*>(atomic_bool_ptr);
atomic_bool->store(true, std::memory_order_relaxed);
}
} // namespace
TEST(EnvTest, ReadWrite) {
Random rnd(test::RandomSeed());
// Get file to use for testing.
std::string test_dir;
ASSERT_OK(env_->GetTestDirectory(&test_dir));
std::string test_file_name = test_dir + "/open_on_read.txt";
WritableFile* writable_file;
ASSERT_OK(env_->NewWritableFile(test_file_name, &writable_file));
// Fill a file with data generated via a sequence of randomly sized writes.
static const size_t kDataSize = 10 * 1048576;
std::string data;
while (data.size() < kDataSize) {
int len = rnd.Skewed(18); // Up to 2^18 - 1, but typically much smaller
std::string r;
test::RandomString(&rnd, len, &r);
ASSERT_OK(writable_file->Append(r));
data += r;
if (rnd.OneIn(10)) {
ASSERT_OK(writable_file->Flush());
}
}
ASSERT_OK(writable_file->Sync());
ASSERT_OK(writable_file->Close());
delete writable_file;
// Read all data using a sequence of randomly sized reads.
SequentialFile* sequential_file;
ASSERT_OK(env_->NewSequentialFile(test_file_name, &sequential_file));
std::string read_result;
std::string scratch;
while (read_result.size() < data.size()) {
int len = std::min<int>(rnd.Skewed(18), data.size() - read_result.size());
scratch.resize(std::max(len, 1)); // at least 1 so &scratch[0] is legal
Slice read;
ASSERT_OK(sequential_file->Read(len, &read, &scratch[0]));
if (len > 0) {
ASSERT_GT(read.size(), 0);
}
ASSERT_LE(read.size(), len);
read_result.append(read.data(), read.size());
}
ASSERT_EQ(read_result, data);
delete sequential_file;
}
TEST(EnvTest, RunImmediately) {
std::atomic<bool> called(false);
env_->Schedule(&SetAtomicBool, &called);
env_->SleepForMicroseconds(kDelayMicros);
ASSERT_TRUE(called.load(std::memory_order_relaxed));
}
TEST(EnvTest, RunMany) {
std::atomic<int> last_id(0);
struct Callback {
std::atomic<int>* const last_id_ptr_; // Pointer to shared state.
const int id_; // Order# for the execution of this callback.
Callback(std::atomic<int>* last_id_ptr, int id)
: last_id_ptr_(last_id_ptr), id_(id) {}
static void Run(void* arg) {
Callback* callback = reinterpret_cast<Callback*>(arg);
int current_id = callback->last_id_ptr_->load(std::memory_order_relaxed);
ASSERT_EQ(callback->id_ - 1, current_id);
callback->last_id_ptr_->store(callback->id_, std::memory_order_relaxed);
}
};
Callback callback1(&last_id, 1);
Callback callback2(&last_id, 2);
Callback callback3(&last_id, 3);
Callback callback4(&last_id, 4);
env_->Schedule(&Callback::Run, &callback1);
env_->Schedule(&Callback::Run, &callback2);
env_->Schedule(&Callback::Run, &callback3);
env_->Schedule(&Callback::Run, &callback4);
env_->SleepForMicroseconds(kDelayMicros);
ASSERT_EQ(4, last_id.load(std::memory_order_relaxed));
}
struct State {
port::Mutex mu;
int val GUARDED_BY(mu);
int num_running GUARDED_BY(mu);
State(int val, int num_running) : val(val), num_running(num_running) {}
};
static void ThreadBody(void* arg) {
State* s = reinterpret_cast<State*>(arg);
s->mu.Lock();
s->val += 1;
s->num_running -= 1;
s->mu.Unlock();
}
TEST(EnvTest, StartThread) {
State state(0, 3);
for (int i = 0; i < 3; i++) {
env_->StartThread(&ThreadBody, &state);
}
while (true) {
state.mu.Lock();
int num = state.num_running;
state.mu.Unlock();
if (num == 0) {
break;
}
env_->SleepForMicroseconds(kDelayMicros);
}
MutexLock l(&state.mu);
ASSERT_EQ(state.val, 3);
}
TEST(EnvTest, TestOpenNonExistentFile) {
// Write some test data to a single file that will be opened |n| times.
std::string test_dir;
ASSERT_OK(env_->GetTestDirectory(&test_dir));
std::string non_existent_file = test_dir + "/non_existent_file";
ASSERT_TRUE(!env_->FileExists(non_existent_file));
RandomAccessFile* random_access_file;
Status status =
env_->NewRandomAccessFile(non_existent_file, &random_access_file);
ASSERT_TRUE(status.IsNotFound());
SequentialFile* sequential_file;
status = env_->NewSequentialFile(non_existent_file, &sequential_file);
ASSERT_TRUE(status.IsNotFound());
}
TEST(EnvTest, ReopenWritableFile) {
std::string test_dir;
ASSERT_OK(env_->GetTestDirectory(&test_dir));
std::string test_file_name = test_dir + "/reopen_writable_file.txt";
env_->DeleteFile(test_file_name);
WritableFile* writable_file;
ASSERT_OK(env_->NewWritableFile(test_file_name, &writable_file));
std::string data("hello world!");
ASSERT_OK(writable_file->Append(data));
ASSERT_OK(writable_file->Close());
delete writable_file;
ASSERT_OK(env_->NewWritableFile(test_file_name, &writable_file));
data = "42";
ASSERT_OK(writable_file->Append(data));
ASSERT_OK(writable_file->Close());
delete writable_file;
ASSERT_OK(ReadFileToString(env_, test_file_name, &data));
ASSERT_EQ(std::string("42"), data);
env_->DeleteFile(test_file_name);
}
TEST(EnvTest, ReopenAppendableFile) {
std::string test_dir;
ASSERT_OK(env_->GetTestDirectory(&test_dir));
std::string test_file_name = test_dir + "/reopen_appendable_file.txt";
env_->DeleteFile(test_file_name);
WritableFile* appendable_file;
ASSERT_OK(env_->NewAppendableFile(test_file_name, &appendable_file));
std::string data("hello world!");
ASSERT_OK(appendable_file->Append(data));
ASSERT_OK(appendable_file->Close());
delete appendable_file;
ASSERT_OK(env_->NewAppendableFile(test_file_name, &appendable_file));
data = "42";
ASSERT_OK(appendable_file->Append(data));
ASSERT_OK(appendable_file->Close());
delete appendable_file;
ASSERT_OK(ReadFileToString(env_, test_file_name, &data));
ASSERT_EQ(std::string("hello world!42"), data);
env_->DeleteFile(test_file_name);
}
} // namespace leveldb
int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
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