eth_config endpoint addition (#217)

* eth_config basic setup

* Add custom serialization and add hash/forkid fields

* remove importutils import

* Don't update to pkg/results yet

* import njs/pkg/results

* update to Uint256

* update activation time to Quantity

* allow nil return

* adjust to new eip changes

* use JsonNumber

* add timestamp

* shift to generalized primtive Number

* incorporate suggestions

---------

Co-authored-by: jangko <jangko128@gmail.com>

Author: advaita-saha

tests/test_json_marshalling.nim

@@ -40,6 +40,11 @@ proc rand[T: Quantity](_: type T): T =
   discard randomBytes(res)
   T(distinctBase(T).fromBytesBE(res))
 
+proc rand[T: Number](_: type T): T =
+  var res: array[sizeof(T), byte]
+  discard randomBytes(res)
+  T(distinctBase(T).fromBytesBE(res))
+
 proc rand[T: ChainId](_: type T): T =
   var res: array[8, byte]
   discard randomBytes(res)
@@ -222,6 +227,8 @@ suite "JSON-RPC Quantity":
     checkRandomObject(PayloadAttributes)
     checkRandomObject(GetPayloadResponse)
 
+    checkRandomObject(EthConfigObject)
+
   test "check blockId":
     let a = RtBlockIdentifier(kind: bidNumber, number: 77.Quantity)
     let x = JrpcConv.encode(a)

web3/conversions.nim

@@ -62,6 +62,9 @@ BlockHeader.useDefaultSerializationIn JrpcConv
 BlockObject.useDefaultSerializationIn JrpcConv
 TransactionObject.useDefaultSerializationIn JrpcConv
 ReceiptObject.useDefaultSerializationIn JrpcConv
+BlobScheduleObject.useDefaultSerializationIn JrpcConv
+ConfigObject.useDefaultSerializationIn JrpcConv
+EthConfigObject.useDefaultSerializationIn JrpcConv
 
 #------------------------------------------------------------------------------
 # engine_api_types
@@ -252,6 +255,16 @@ proc readValue*(r: var JsonReader[JrpcConv], val: var Hash32)
   wrapValueError:
     val = fromHex(Hash32, r.parseString())
 
+proc writeValue*(w: var JsonWriter[JrpcConv], v: Number)
+      {.gcsafe, raises: [IOError].} =
+  w.streamElement(s):
+    s.writeText distinctBase(v)
+
+proc readValue*(r: var JsonReader[JrpcConv], val: var Number)
+       {.gcsafe, raises: [IOError, JsonReaderError].} =
+  wrapValueError:
+    val = r.parseInt(uint64).Number
+  
 proc readValue*[F: CommonJsonFlavors](r: var JsonReader[F], val: var TypedTransaction)
        {.gcsafe, raises: [IOError, JsonReaderError].} =
   wrapValueError:
@@ -313,6 +326,16 @@ proc readValue*[F: CommonJsonFlavors](r: var JsonReader[F], val: var UInt256)
   wrapValueError:
     val = hexStr.parse(StUint[256], 16)
 
+proc readValue*[F: CommonJsonFlavors](r: var JsonReader[F], val: var seq[PrecompilePair])
+      {.gcsafe, raises: [IOError, SerializationError].} =
+  for k,v in readObject(r, string, Address):
+    val.add PrecompilePair(name: k, address: v)
+
+proc readValue*[F: CommonJsonFlavors](r: var JsonReader[F], val: var seq[SystemContractPair])
+      {.gcsafe, raises: [IOError, SerializationError].} =
+  for k,v in readObject(r, string, Address):
+    val.add SystemContractPair(name: k, address: v)
+
 #------------------------------------------------------------------------------
 # Exclusive to JrpcConv
 #------------------------------------------------------------------------------
@@ -435,6 +458,20 @@ proc writeValue*(w: var JsonWriter[JrpcConv], v: Opt[seq[ReceiptObject]])
   else:
     w.writeValue JsonString("null")
 
+proc writeValue*(w: var JsonWriter[JrpcConv], v: seq[PrecompilePair])
+      {.gcsafe, raises: [IOError].} =
+  w.beginObject()
+  for x in v:
+    w.writeMember(x.name, x.address)
+  w.endObject()
+
+proc writeValue*(w: var JsonWriter[JrpcConv], v: seq[SystemContractPair])
+      {.gcsafe, raises: [IOError].} =
+  w.beginObject()
+  for x in v:
+    w.writeMember(x.name, x.address)
+  w.endObject()
+
 proc writeValue*(w: var JsonWriter[JrpcConv], v: TransactionArgs)
       {.gcsafe, raises: [IOError].} =
   mixin writeValue

web3/eth_api.nim

@@ -70,6 +70,7 @@ createRpcSigsFromNim(RpcClient):
   proc eth_getFilterLogs(filterId: string): JsonNode
   proc eth_getLogs(filterOptions: FilterOptions): seq[LogObject]
   proc eth_chainId(): UInt256
+  proc eth_config(): EthConfigObject
 
   proc eth_getWork(): seq[UInt256]
   proc eth_submitWork(nonce: uint64, powHash: Hash32, mixDigest: Hash32): bool

web3/eth_api_types.nim

@@ -262,6 +262,32 @@ type
     blobGasUsedRatio*: seq[float64]
     reward*: Opt[seq[FeeHistoryReward]]
 
+  BlobScheduleObject* = object
+    baseFeeUpdateFraction*: Number
+    max*: Number
+    target*: Number
+
+  PrecompilePair* = object
+    address*: Address
+    name*: string
+
+  SystemContractPair* = object
+    name*: string
+    address*: Address
+
+  ConfigObject* = object
+    activationTime*: Number
+    blobSchedule*: BlobScheduleObject
+    chainId*: UInt256
+    forkId*: Bytes4
+    precompiles*: seq[PrecompilePair]
+    systemContracts*: seq[SystemContractPair]
+
+  EthConfigObject* = ref object
+    current*: ConfigObject
+    next*: Opt[ConfigObject]
+    last*: Opt[ConfigObject]
+
 func blockId*(n: uint64): RtBlockIdentifier =
   RtBlockIdentifier(kind: bidNumber, number: Quantity n)
 

web3/primitives.nim

@@ -43,6 +43,10 @@ type
     # Quantity is use in lieu of an ordinary `uint64` to avoid the default
     # format that comes with json_serialization
 
+  Number* = distinct uint64
+    # Number is use in lieu of an ordinary `uint64` to avoid the default
+    # format that comes with json_serialization
+
   Blob* = FixedBytes[FIELD_ELEMENTS_PER_BLOB * 32]
 
 template `==`*[minLen, maxLen](a, b: DynamicBytes[minLen, maxLen]): bool =