Add Signer.getChainId()

ethers/provider.nim

@@ -29,3 +29,6 @@ method getTransactionCount*(provider: Provider,
 method estimateGas*(provider: Provider,
                     transaction: Transaction): Future[UInt256] {.base.} =
   doAssert false, "not implemented"
+
+method getChainId*(provider: Provider): Future[UInt256] {.base.} =
+  doAssert false, "not implemented"

ethers/providers/jsonrpc.nim

@@ -80,6 +80,13 @@ method estimateGas*(provider: JsonRpcProvider,
   let client = await provider.client
   return await client.eth_estimateGas(transaction)
 
+method getChainId*(provider: JsonRpcProvider): Future[UInt256] {.async.} =
+  let client = await provider.client
+  try:
+    return await client.eth_chainId()
+  except CatchableError:
+    return parse(await client.net_version(), UInt256)
+
 # Signer
 
 method provider*(signer: JsonRpcSigner): Provider =

ethers/providers/rpccalls/signatures.nim

@@ -1,6 +1,8 @@
+proc net_version(): string
 proc eth_accounts: seq[Address]
 proc eth_blockNumber: UInt256
 proc eth_call(transaction: Transaction): seq[byte]
 proc eth_gasPrice(): UInt256
 proc eth_getTransactionCount(address: Address, blockTag: BlockTag): UInt256
 proc eth_estimateGas(transaction: Transaction): UInt256
+proc eth_chainId(): UInt256

ethers/signer.nim

@@ -25,3 +25,6 @@ method estimateGas*(signer: Signer,
   var transaction = transaction
   transaction.sender = some(await signer.getAddress)
   return await signer.provider.estimateGas(transaction)
+
+method getChainId*(signer: Signer): Future[UInt256] {.base.} =
+  signer.provider.getChainId()

testmodule/testJsonRpcSigner.nim

@@ -33,3 +33,8 @@ suite "JsonRpcSigner":
     let signer = provider.getSigner()
     let estimate = await signer.estimateGas(Transaction.example)
     check estimate > 0.u256
+
+  test "can retrieve chain id":
+    let signer = provider.getSigner()
+    let chainId = await signer.getChainId()
+    check chainId == 31337.u256 # hardhat chain id