github.com/unicornultrafoundation/go-u2u@v1.0.0-rc1.0.20240205080301-e74a83d3fadc/utils/adapters/ethdb2udb/adapter.go (about)

     1  package ethdb2udb
     2  
     3  import (
     4  	"github.com/unicornultrafoundation/go-helios/u2udb"
     5  	"github.com/unicornultrafoundation/go-u2u/ethdb"
     6  )
     7  
     8  type Adapter struct {
     9  	ethdb.KeyValueStore
    10  }
    11  
    12  var _ u2udb.Store = (*Adapter)(nil)
    13  
    14  func Wrap(v ethdb.KeyValueStore) *Adapter {
    15  	return &Adapter{v}
    16  }
    17  
    18  func (db *Adapter) Drop() {
    19  	panic("called Drop on ethdb")
    20  }
    21  
    22  // batch is a write-only memory batch that commits changes to its host
    23  // database when Write is called. A batch cannot be used concurrently.
    24  type batch struct {
    25  	ethdb.Batch
    26  }
    27  
    28  // Replay replays the batch contents.
    29  func (b *batch) Replay(w u2udb.Writer) error {
    30  	return b.Batch.Replay(w)
    31  }
    32  
    33  // NewBatch creates a write-only key-value store that buffers changes to its host
    34  // database until a final write is called.
    35  func (db *Adapter) NewBatch() u2udb.Batch {
    36  	return &batch{db.KeyValueStore.NewBatch()}
    37  }
    38  
    39  func (db *Adapter) GetSnapshot() (u2udb.Snapshot, error) {
    40  	panic("called GetSnapshot on ethdb")
    41  	return nil, nil
    42  }
    43  
    44  // NewIterator creates a binary-alphabetical iterator over a subset
    45  // of database content with a particular key prefix, starting at a particular
    46  // initial key (or after, if it does not exist).
    47  func (db *Adapter) NewIterator(prefix []byte, start []byte) u2udb.Iterator {
    48  	return db.KeyValueStore.NewIterator(prefix, start)
    49  }