optimize the structure of Put

db/db_impl.cc

@@ -1218,15 +1218,7 @@ Status DBImpl::Put(const WriteOptions& o, const Slice& key, const Slice& val) {
 
 Status DBImpl::Put(const WriteOptions& opt, const Slice& key,
                    const Slice& value, uint64_t ttl) {
-  WriteBatch batch;
-  auto now = std::chrono::system_clock::now();
-  auto timestamp = std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch()).count();
-  auto microsecondsTimestamp = static_cast<uint64_t>(timestamp) + ttl*1000000;
-  std::string value_ttl = value.ToString();
-  value_ttl += "_" + std::to_string(microsecondsTimestamp);
-  Slice new_value(value_ttl.c_str(), value_ttl.size());
-  batch.Put(key, new_value);
-  return Write(opt, &batch);
+  return DB::Put(opt, key, value, ttl);
 }
 
 Status DBImpl::Delete(const WriteOptions& options, const Slice& key) {
@@ -1521,6 +1513,19 @@ Status DB::Put(const WriteOptions& opt, const Slice& key, const Slice& value) {
   batch.Put(key, value);
   return Write(opt, &batch);
 }
+// for TTL
+Status DB::Put(const WriteOptions& opt, const Slice& key,
+                   const Slice& value, uint64_t ttl) {
+  WriteBatch batch;
+  auto now = std::chrono::system_clock::now();
+  auto timestamp = std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch()).count();
+  auto microsecondsTimestamp = static_cast<uint64_t>(timestamp) + ttl*1000000;
+  std::string value_ttl = value.ToString();
+  value_ttl += "_" + std::to_string(microsecondsTimestamp);
+  Slice new_value(value_ttl.c_str(), value_ttl.size());
+  batch.Put(key, new_value);
+  return Write(opt, &batch);
+}
 
 Status DB::Delete(const WriteOptions& opt, const Slice& key) {
   WriteBatch batch;