Get storage API, with storage leaf CID and raw IPLD block.

pkg/eth/backend.go

@@ -767,7 +767,7 @@ func (b *Backend) GetStorageByHash(ctx context.Context, address common.Address,
 		return nil, err
 	}
 
-	_, storageRlp, err := b.IPLDRetriever.RetrieveStorageAtByAddressAndStorageSlotAndBlockHash(address, key, hash)
+	_, _, storageRlp, err := b.IPLDRetriever.RetrieveStorageAtByAddressAndStorageSlotAndBlockHash(address, key, hash)
 	return storageRlp, err
 }
 

pkg/eth/ipld_retriever.go

@@ -429,25 +429,25 @@ func (r *IPLDRetriever) RetrieveAccountByAddressAndBlockNumber(address common.Ad
 }
 
 // RetrieveStorageAtByAddressAndStorageSlotAndBlockHash returns the cid and rlp bytes for the storage value corresponding to the provided address, storage slot, and block hash
-func (r *IPLDRetriever) RetrieveStorageAtByAddressAndStorageSlotAndBlockHash(address common.Address, key, hash common.Hash) (string, []byte, error) {
+func (r *IPLDRetriever) RetrieveStorageAtByAddressAndStorageSlotAndBlockHash(address common.Address, key, hash common.Hash) (string, []byte, []byte, error) {
 	storageResult := new(nodeInfo)
 	stateLeafKey := crypto.Keccak256Hash(address.Bytes())
 	storageHash := crypto.Keccak256Hash(key.Bytes())
 	if err := r.db.Get(storageResult, RetrieveStorageLeafByAddressHashAndLeafKeyAndBlockHashPgStr, stateLeafKey.Hex(), storageHash.Hex(), hash.Hex()); err != nil {
-		return "", nil, err
+		return "", nil, nil, err
 	}
 	if storageResult.Removed {
-		return "", []byte{}, nil
+		return "", []byte{}, []byte{}, nil
 	}
 	var i []interface{}
 	if err := rlp.DecodeBytes(storageResult.Data, &i); err != nil {
 		err = fmt.Errorf("error decoding storage leaf node rlp: %s", err.Error())
-		return "", nil, err
+		return "", nil, nil, err
 	}
 	if len(i) != 2 {
-		return "", nil, fmt.Errorf("eth IPLDRetriever expected storage leaf node rlp to decode into two elements")
+		return "", nil, nil, fmt.Errorf("eth IPLDRetriever expected storage leaf node rlp to decode into two elements")
 	}
-	return storageResult.CID, i[1].([]byte), nil
+	return storageResult.CID, storageResult.Data, i[1].([]byte), nil
 }
 
 // RetrieveStorageAtByAddressAndStorageKeyAndBlockNumber returns the cid and rlp bytes for the storage value corresponding to the provided address, storage key, and block number

pkg/graphql/graphql.go

@@ -956,12 +956,47 @@ func (r *Resolver) Logs(ctx context.Context, args struct{ Filter FilterCriteria
 	return runFilter(ctx, r.backend, filter)
 }
 
+// StorageResult represents a storage slot value. All arguments are mandatory.
+type StorageResult struct {
+	value     []byte
+	cid       string
+	ipldBlock []byte
+}
+
+func (s *StorageResult) Value(ctx context.Context) common.Hash {
+	return common.BytesToHash(s.value)
+}
+
+func (s *StorageResult) Cid(ctx context.Context) string {
+	return s.cid
+}
+
+func (s *StorageResult) IpldBlock(ctx context.Context) hexutil.Bytes {
+	return hexutil.Bytes(s.ipldBlock)
+}
+
 func (r *Resolver) GetStorageAt(ctx context.Context, args struct {
 	BlockHash common.Hash
 	Contract  common.Address
 	Slot      common.Hash
-}) (*common.Hash, error) {
-	ret := common.BytesToHash([]byte{})
+}) (*StorageResult, error) {
+	cid, ipldBlock, rlpValue, err := r.backend.IPLDRetriever.RetrieveStorageAtByAddressAndStorageKeyAndBlockHash(args.Contract, args.Slot, args.BlockHash)
+
+	if err != nil {
+		return nil, err
+	}
+
+	var value interface{}
+	err = rlp.DecodeBytes(rlpValue, &value)
+	if err != nil {
+		return nil, err
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	ret := StorageResult{value: value.([]byte), cid: cid, ipldBlock: ipldBlock}
 
 	return &ret, nil
 }

pkg/graphql/schema.go

@@ -265,6 +265,17 @@ const schema string = `
         topics: [[Bytes32!]!]
     }
 
+    # Storage trie value with IPLD data.
+    type StorageResult {
+        value: Bytes32!
+
+        # CID for the storage trie IPLD block.
+        cid: String!
+
+        # Storage trie IPLD block.
+        ipldBlock: Bytes!
+    }
+
     type Query {
         # Block fetches an Ethereum block by number or by hash. If neither is
         # supplied, the most recent known block is returned.
@@ -281,7 +292,7 @@ const schema string = `
         logs(filter: FilterCriteria!): [Log!]!
 
         # Get storage slot by block hash and contract address.
-        getStorageAt(blockHash: Bytes32!, contract: Address!, slot: Bytes32!): Bytes32
+        getStorageAt(blockHash: Bytes32!, contract: Address!, slot: Bytes32!): StorageResult
 
         # Get contract logs by block hash and contract address.
         getLogs(blockHash: Bytes32!, contract: Address!): [Log!]