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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package store | ||
|
|
||
| import ( | ||
| "errors" | ||
|
|
||
| "github.com/cosmos/cosmos-sdk/types" | ||
| ) | ||
|
|
||
| // CosmosStore is a Cosmos KVStore implementation of Store. | ||
| type CosmosStore struct { | ||
| store types.KVStore | ||
| } | ||
|
|
||
| // NewCosmosStore returns a new Cosmos KVStore wrapper. | ||
| func NewCosmosStore(store types.KVStore) *CosmosStore { | ||
| return &CosmosStore{ | ||
| store: store, | ||
| } | ||
| } | ||
|
|
||
| // NewIterator returns a new iterator. | ||
| func (s *CosmosStore) NewIterator() Iterator { | ||
| return NewCosmosIterator(types.KVStorePrefixIterator(s.store, nil)) | ||
| } | ||
|
|
||
| // Has returns true if the key is set in the store. | ||
| func (s *CosmosStore) Has(key []byte) (bool, error) { | ||
| return s.store.Has(key), nil | ||
| } | ||
|
|
||
| // Get retrives service from store. It returns an error if the store does not contains the key. | ||
| func (s *CosmosStore) Get(key []byte) ([]byte, error) { | ||
| has, err := s.Has(key) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if !has { | ||
| return nil, errors.New("not found") | ||
| } | ||
| return s.store.Get(key), nil | ||
| } | ||
|
|
||
| // Delete deletes the value for the given key. Delete will not returns error if key doesn't exist. | ||
| func (s *CosmosStore) Delete(key []byte) error { | ||
| s.store.Delete(key) | ||
| return nil | ||
| } | ||
|
|
||
| // Put sets the value for the given key. It overwrites any previous value. | ||
| func (s *CosmosStore) Put(key []byte, value []byte) error { | ||
| s.store.Set(key, value) | ||
| return nil | ||
| } | ||
|
|
||
| // Close closes the store. | ||
| func (s *CosmosStore) Close() error { | ||
| return nil | ||
| } | ||
|
|
||
| // CosmosIterator is a Cosmos KVStore's iterator implementation of Iterator. | ||
| type CosmosIterator struct { | ||
| iter types.Iterator | ||
| } | ||
|
|
||
| // NewCosmosIterator returns a new Cosmos KVStore Iterator wrapper. | ||
| func NewCosmosIterator(iter types.Iterator) *CosmosIterator { | ||
| return &CosmosIterator{ | ||
| iter: iter, | ||
| } | ||
| } | ||
|
|
||
| // Next moves the iterator to the next sequential key in the store. | ||
| func (i *CosmosIterator) Next() bool { | ||
| if i.iter.Valid() { | ||
| i.iter.Next() | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| // Key returns the key of the cursor. | ||
| func (i *CosmosIterator) Key() []byte { | ||
| return i.iter.Key() | ||
| } | ||
|
|
||
| // Value returns the value of the cursor. | ||
| func (i *CosmosIterator) Value() []byte { | ||
| return i.iter.Value() | ||
| } | ||
|
|
||
| // Release releases the Iterator. | ||
| func (i *CosmosIterator) Release() { | ||
| i.iter.Close() | ||
| } | ||
|
|
||
| // Error returns any accumulated error. | ||
| func (i *CosmosIterator) Error() error { | ||
| return nil | ||
| } |
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