switch slog file for new comming slog data in any way

unittest/storage/blocksstable/slog/test_storage_log_reader_writer.cpp

@@ -23,6 +23,59 @@ using namespace ::testing;
 
 namespace oceanbase {
 namespace blocksstable {
+class TestLogData
+{
+public:
+  TestLogData(char* data, int len)
+    : data_(data), len_(len), locally_allocated(false)
+  {
+  }
+
+  TestLogData(int len)
+    : data_(nullptr), len_(len), locally_allocated(true)
+  {
+    data_ = new char[len]();
+    MEMSET(data_, 'T', len);
+  }
+
+  ~TestLogData()
+  {
+    if (locally_allocated)
+    {
+      delete[] data_;
+      data_ = nullptr;
+    }
+  }
+public:
+  int serialize(char *buf, int64_t limit, int64_t &pos) const
+  {
+    int ret = OB_SUCCESS;
+    if (OB_ISNULL(buf) || limit < 0 || pos < 0) {
+      ret = OB_INVALID_ARGUMENT;
+    } else if (pos + len_ > limit) {
+      ret = OB_BUF_NOT_ENOUGH;
+    } else {
+      MEMCPY(buf + pos, data_, len_);
+      pos += len_;
+    }
+    return ret;
+  }
+
+  int deserialize(const char *buf, int64_t limit, int64_t &pos)
+  {
+    UNUSED(buf);
+    UNUSED(limit);
+    UNUSED(pos);
+    return OB_NOT_SUPPORTED;
+  }
+
+  int get_serialize_size() const { return len_; }
+public:
+  char *data_;
+  int len_;
+  bool locally_allocated;
+};
+
 class TestStorageLogReaderWriter : public ::testing::Test {
 public:
   TestStorageLogReaderWriter()
@@ -31,6 +84,8 @@ public:
   {}
   virtual void SetUp();
   virtual void TearDown();
+
+  ObBaseStorageLogBuffer get_buffer(const TestLogData& log_data);
 };
 
 void TestStorageLogReaderWriter::SetUp()
@@ -45,6 +100,14 @@ void TestStorageLogReaderWriter::TearDown()
   system("rm -rf ./test_storage_log_rw");
 }
 
+ObBaseStorageLogBuffer TestStorageLogReaderWriter::get_buffer(const TestLogData& log_data)
+{
+  ObBaseStorageLogBuffer buffer;
+  buffer.assign(log_data.data_, log_data.len_);
+  buffer.set_pos(log_data.len_);
+  return buffer;
+}
+
 TEST_F(TestStorageLogReaderWriter, normal)
 {
   int ret = OB_SUCCESS;
@@ -748,6 +811,62 @@ TEST_F(TestStorageLogReaderWriter, seek_second_log)
   ASSERT_EQ(OB_SUCCESS, ret);
   OB_LOG(INFO, "read finish ", K(read_cursor));
 }
+
+TEST_F(TestStorageLogReaderWriter, seek_to_end)
+{
+  int ret = OB_SUCCESS;
+  char LOG_DIR[512] = { 0 };
+  strcpy(LOG_DIR, "./test_storage_log_rw");
+  const int64_t LOG_FILE_SIZE = 64 << 20; //64MB
+  const int64_t CONCURRENT_TRANS_CNT = 128;
+  const int64_t LOG_BUFFER_SIZE = 1966080L;  // 1.875MB
+  const int64_t LOG_FILE_ID = 615;
+  const int64_t LOG_START_SEQ = 320168236;
+  const int64_t CKPT_BUFFER_SIZE = 4096 - 32 - 12;
+  // write part
+  ObLogCursor start_cursor;
+  start_cursor.file_id_ = LOG_FILE_ID;
+  start_cursor.log_id_ = LOG_START_SEQ;
+  start_cursor.offset_ = 0;
+
+  ObStorageLogWriter writer;
+  writer.init(LOG_DIR, LOG_FILE_SIZE, LOG_BUFFER_SIZE, CONCURRENT_TRANS_CNT);
+  ret = writer.start_log(start_cursor);
+  ASSERT_EQ(OB_SUCCESS, ret);
+  // write checkpoint log
+  TestLogData CKPT_LOG_DATA(CKPT_BUFFER_SIZE);
+  start_cursor.reset();
+  ret = writer.flush_log(LogCommand::OB_LOG_CHECKPOINT, get_buffer(CKPT_LOG_DATA), start_cursor);
+  ASSERT_EQ(OB_SUCCESS, ret);
+  ASSERT_EQ(LOG_FILE_ID, start_cursor.file_id_);
+  ASSERT_EQ(LOG_START_SEQ, start_cursor.log_id_);
+  // read part
+  LogCommand cmd = LogCommand::OB_LOG_UNKNOWN;
+  uint64_t seq = 0;
+  int64_t read_len = 0;
+  char *read_data = nullptr;
+  ObLogCursor read_cursor;
+  ObStorageLogReader reader;
+  ret = reader.init(LOG_DIR, LOG_FILE_ID, LOG_START_SEQ);
+  ASSERT_EQ(OB_SUCCESS, ret);
+  int64_t last_entry_seq = -1;
+  int64_t cnt = 0;
+  while (OB_SUCC(ret) && OB_SUCC(reader.read_log(cmd, seq, read_data, read_len))) {
+    ++cnt;
+    if (OB_SUCC(ret)) {
+      last_entry_seq = seq;
+    }
+  }
+  ASSERT_EQ(OB_READ_NOTHING, ret);
+  // last_entry_seq is not -1 beacuse there's nop log
+  ASSERT_EQ(LOG_START_SEQ + 1, last_entry_seq);
+  ASSERT_EQ(1, cnt);
+  ret = reader.get_next_cursor(read_cursor);
+  ASSERT_EQ(OB_SUCCESS, ret);
+  ASSERT_EQ(LOG_FILE_ID, read_cursor.file_id_);
+  ASSERT_EQ(LOG_START_SEQ + 2, read_cursor.log_id_);
+  ASSERT_EQ(4096 * 2, read_cursor.offset_);
+}
 }  // namespace blocksstable
 }  // namespace oceanbase