Add Signer.estimateGas()
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@ -25,3 +25,7 @@ method getTransactionCount*(provider: Provider,
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blockTag = BlockTag.latest):
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blockTag = BlockTag.latest):
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Future[UInt256] {.base.} =
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Future[UInt256] {.base.} =
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doAssert false, "not implemented"
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doAssert false, "not implemented"
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method estimateGas*(provider: Provider,
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transaction: Transaction): Future[UInt256] {.base.} =
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doAssert false, "not implemented"
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@ -75,6 +75,11 @@ method getTransactionCount*(provider: JsonRpcProvider,
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let client = await provider.client
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let client = await provider.client
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return await client.eth_getTransactionCount(address, blockTag)
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return await client.eth_getTransactionCount(address, blockTag)
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method estimateGas*(provider: JsonRpcProvider,
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transaction: Transaction): Future[UInt256] {.async.} =
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let client = await provider.client
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return await client.eth_estimateGas(transaction)
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# Signer
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# Signer
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method provider*(signer: JsonRpcSigner): Provider =
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method provider*(signer: JsonRpcSigner): Provider =
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@ -34,7 +34,9 @@ func fromJson*(json: JsonNode, name: string, result: var UInt256) =
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# Transaction
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# Transaction
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func `%`*(tx: Transaction): JsonNode =
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func `%`*(tx: Transaction): JsonNode =
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%{ "to": %tx.to, "data": %tx.data }
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result = %{ "to": %tx.to, "data": %tx.data }
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if sender =? tx.sender:
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result["from"] = %sender
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# BlockTag
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# BlockTag
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@ -1,5 +1,6 @@
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proc eth_accounts: seq[Address]
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proc eth_accounts: seq[Address]
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proc eth_blockNumber: UInt256
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proc eth_blockNumber: UInt256
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proc eth_call(tx: Transaction): seq[byte]
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proc eth_call(transaction: Transaction): seq[byte]
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proc eth_gasPrice(): UInt256
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proc eth_gasPrice(): UInt256
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proc eth_getTransactionCount(address: Address, blockTag: BlockTag): UInt256
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proc eth_getTransactionCount(address: Address, blockTag: BlockTag): UInt256
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proc eth_estimateGas(transaction: Transaction): UInt256
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@ -19,3 +19,9 @@ method getTransactionCount*(signer: Signer,
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Future[UInt256] {.base, async.} =
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Future[UInt256] {.base, async.} =
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let address = await signer.getAddress()
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let address = await signer.getAddress()
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return await signer.provider.getTransactionCount(address, blockTag)
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return await signer.provider.getTransactionCount(address, blockTag)
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method estimateGas*(signer: Signer,
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transaction: Transaction): Future[UInt256] {.base, async.} =
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var transaction = transaction
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transaction.sender = some(await signer.getAddress)
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return await signer.provider.estimateGas(transaction)
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@ -2,8 +2,14 @@ import pkg/stew/byteutils
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import ./basics
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import ./basics
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type Transaction* = object
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type Transaction* = object
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sender*: ?Address
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to*: Address
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to*: Address
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data*: seq[byte]
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data*: seq[byte]
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func `$`*(transaction: Transaction): string =
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func `$`*(transaction: Transaction): string =
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"(to: " & $transaction.to & ", data: 0x" & $transaction.data.toHex & ")"
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result = "("
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if sender =? transaction.sender:
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result &= "from: " & $sender & ", "
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result &= "to: " & $transaction.to & ", "
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result &= "data: 0x" & $transaction.data.toHex
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result &= ")"
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@ -0,0 +1,18 @@
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import std/random
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import std/sequtils
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import pkg/ethers
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randomize()
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proc example*(_: type Address): Address =
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var address: array[20, byte]
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for b in address.mitems:
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b = rand(byte)
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Address.init(address)
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proc example*(_: type seq[byte]): seq[byte] =
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let length = rand(0..<20)
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newSeqWith(length, rand(byte))
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proc example*(_: type Transaction): Transaction =
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Transaction(to: Address.example, data: seq[byte].example)
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@ -1,5 +1,6 @@
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import pkg/asynctest
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import pkg/asynctest
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import pkg/ethers
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import pkg/ethers
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import ./examples
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suite "JsonRpcSigner":
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suite "JsonRpcSigner":
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@ -27,3 +28,8 @@ suite "JsonRpcSigner":
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let signer = provider.getSigner(accounts[9])
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let signer = provider.getSigner(accounts[9])
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let count = await signer.getTransactionCount(BlockTag.pending)
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let count = await signer.getTransactionCount(BlockTag.pending)
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check count == 0.u256
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check count == 0.u256
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test "can estimate gas cost of a transaction":
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let signer = provider.getSigner()
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let estimate = await signer.estimateGas(Transaction.example)
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check estimate > 0.u256
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