add engine_getBlobsV1 (#187)

* add engine_getBlobsV1

* don't overload for versions

Author: agnxsh

web3/engine_api.nim

@@ -38,6 +38,7 @@ createRpcSigsFromNim(RpcClient):
   proc engine_getPayloadV4(payloadId: Bytes8): GetPayloadV4Response
   proc engine_getPayloadBodiesByHashV1(hashes: seq[Hash32]): seq[Opt[ExecutionPayloadBodyV1]]
   proc engine_getPayloadBodiesByRangeV1(start: Quantity, count: Quantity): seq[Opt[ExecutionPayloadBodyV1]]
+  proc engine_getBlobsV1(blob_versioned_hashes: Bytes32): GetBlobsV1Response
 
   # https://github.com/ethereum/execution-apis/blob/9301c0697e4c7566f0929147112f6d91f65180f6/src/engine/common.md
   proc engine_exchangeCapabilities(methods: seq[string]): seq[string]
@@ -107,6 +108,13 @@ template getPayload*(
     payloadId: Bytes8): Future[GetPayloadV4Response] =
   engine_getPayloadV4(rpcClient, payloadId)
 
+template getBlobs*(
+    rpcClient: RpcClient,
+    T: type GetBlobsV1Response,
+    blob_versioned_hashes: Bytes32):
+    Future[GetBlobsV1Response] =
+  engine_getBlobsV1(rpcClient, blob_versioned_hashes)
+
 template newPayload*(
     rpcClient: RpcClient,
     payload: ExecutionPayloadV1): Future[PayloadStatusV1] =

web3/engine_api_types.nim

@@ -127,6 +127,10 @@ type
     proofs*: seq[KzgProof]
     blobs*: seq[Blob]
 
+  BlobAndProofV1* = object
+    blob*: Blob
+    proof*: KzgProof
+
   # https://github.com/ethereum/execution-apis/blob/v1.0.0-beta.4/src/engine/shanghai.md#executionpayloadbodyv1
   # For optional withdrawals field, see:
   #   https://github.com/ethereum/execution-apis/blob/v1.0.0-beta.4/src/engine/shanghai.md#engine_getpayloadbodiesbyhashv1
@@ -223,6 +227,9 @@ type
     shouldOverrideBuilder*: bool
     executionRequests*: seq[seq[byte]]
 
+  GetBlobsV1Response* = object
+    blobAndProof*: BlobAndProofV1
+
   SomeGetPayloadResponse* =
     ExecutionPayloadV1 |
     GetPayloadV2Response |