Allow calls to non-constant functions
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@ -3,6 +3,7 @@ import pkg/chronos
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import pkg/contractabi
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import ./basics
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import ./provider
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import ./signer
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export basics
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export provider
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@ -10,9 +11,19 @@ export provider
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type
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Contract* = ref object of RootObj
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provider: Provider
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signer: ?Signer
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address: Address
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ContractError* = object of EthersError
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func provider*(contract: Contract): Provider =
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contract.provider
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func signer*(contract: Contract): ?Signer =
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contract.signer
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func address*(contract: Contract): Address =
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contract.address
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template raiseContractError(message: string) =
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raise newException(ContractError, message)
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@ -30,13 +41,32 @@ proc decodeResponse(T: type, bytes: seq[byte]): T =
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raiseContractError "unable to decode return value as " & $T
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return decoded
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proc call[ContractType: Contract, ResultType](
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proc call[ContractType: Contract, ReturnType](
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contract: ContractType,
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function: string,
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parameters: tuple):Future[ResultType] {.async.} =
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parameters: tuple): Future[ReturnType] {.async.} =
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let transaction = createTx(contract, function, parameters)
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let response = await contract.provider.call(transaction)
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return decodeResponse(ResultType, response)
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return decodeResponse(ReturnType, response)
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proc callNoResult[ContractType: Contract](
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contract: ContractType,
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function: string,
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parameters: tuple) {.async.} =
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let transaction = createTx(contract, function, parameters)
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discard await contract.provider.call(transaction)
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proc send[ContractType: Contract](
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contract: ContractType,
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function: string,
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parameters: tuple) {.async.} =
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without signer =? contract.signer:
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raiseContractError "trying to send transaction without a signer"
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let transaction = createTx(contract, function, parameters)
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let populated = await signer.populateTransaction(transaction)
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await signer.sendTransaction(populated)
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func getParameterTuple(procedure: var NimNode): NimNode =
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let parameters = procedure[3]
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@ -46,22 +76,46 @@ func getParameterTuple(procedure: var NimNode): NimNode =
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tupl.add name
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return tupl
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func isConstant(procedure: NimNode): bool =
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let pragmas = procedure[4]
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for pragma in pragmas:
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if pragma.eqIdent "view":
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return true
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elif pragma.eqIdent "pure":
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return true
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elif pragma.eqIdent "constant":
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return true
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false
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func addContractCall(procedure: var NimNode) =
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let name = procedure[0]
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let function = if name.kind == nnkPostfix: $name[1] else: $name
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let parameters = procedure[3]
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let contract = parameters[1][0]
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let contracttype = parameters[1][1]
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let resulttype = parameters[0]
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let returntype = parameters[0]
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let tupl = getParameterTuple(procedure)
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procedure[6] = quote do:
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return await call[`contracttype`,`resulttype`](`contract`, `function`, `tupl`)
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if procedure.isConstant:
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if returntype.kind == nnkEmpty:
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procedure[6] = quote do:
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await callNoResult[`contracttype`](
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`contract`, `function`, `tupl`
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)
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else:
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procedure[6] = quote do:
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return await call[`contracttype`,`returntype`](
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`contract`, `function`, `tupl`
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)
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else:
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procedure[6] = quote do:
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if `contract`.signer.isSome:
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await send[`contracttype`](`contract`, `function`, `tupl`)
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else:
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await callNoResult[`contracttype`](`contract`, `function`, `tupl`)
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func addFuture(procedure: var NimNode) =
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let returntype = procedure[3][0]
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if returntype.kind == nnkEmpty:
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procedure[3][0] = quote do: Future[void]
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else:
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if returntype.kind != nnkEmpty:
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procedure[3][0] = quote do: Future[`returntype`]
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func addAsyncPragma(procedure: var NimNode) =
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@ -75,11 +129,30 @@ func new*(ContractType: type Contract,
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provider: Provider): ContractType =
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ContractType(provider: provider, address: address)
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func new*(ContractType: type Contract,
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address: Address,
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signer: Signer): ContractType =
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ContractType(signer: some signer, provider: signer.provider, address: address)
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template view* {.pragma.}
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template pure* {.pragma.}
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template constant* {.pragma.}
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func checkReturnType(procedure: NimNode) =
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let parameters = procedure[3]
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let returntype = parameters[0]
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if returntype.kind != nnkEmpty and not procedure.isConstant:
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const message =
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"only contract functions with {.constant.}, {.pure.} or {.view.} " &
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"can have a return type"
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error(message, returntype)
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macro contract*(procedure: untyped{nkProcDef|nkMethodDef}): untyped =
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let parameters = procedure[3]
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let body = procedure[6]
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parameters.expectMinLen(2)
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body.expectKind(nnkEmpty)
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procedure.checkReturnType()
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var contractcall = copyNimTree(procedure)
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contractcall.addContractCall()
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contractcall.addFuture()
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@ -101,3 +101,8 @@ method getAddress*(signer: JsonRpcSigner): Future[Address] {.async.} =
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return accounts[0]
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raiseProviderError "no address found"
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method sendTransaction*(signer: JsonRpcSigner,
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transaction: Transaction) {.async.} =
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let client = await signer.provider.client
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discard await client.eth_sendTransaction(transaction)
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@ -15,6 +15,10 @@ method provider*(signer: Signer): Provider {.base.} =
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method getAddress*(signer: Signer): Future[Address] {.base.} =
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doAssert false, "not implemented"
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method sendTransaction*(signer: Signer,
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transaction: Transaction) {.base, async.} =
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doAssert false, "not implemented"
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method getGasPrice*(signer: Signer): Future[UInt256] {.base.} =
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signer.provider.getGasPrice()
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@ -8,27 +8,51 @@ type
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Erc20* = ref object of Contract
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TestToken = ref object of Erc20
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method totalSupply*(erc20: Erc20): UInt256 {.base, contract.}
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method balanceOf*(erc20: Erc20, account: Address): UInt256 {.base, contract.}
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method allowance*(erc20: Erc20, owner, spender: Address): UInt256 {.base, contract.}
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method totalSupply*(erc20: Erc20): UInt256 {.base, contract, view.}
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method balanceOf*(erc20: Erc20, account: Address): UInt256 {.base, contract, view.}
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method allowance*(erc20: Erc20, owner, spender: Address): UInt256 {.base, contract, view.}
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method mint(token: TestToken, holder: Address, amount: UInt256) {.base, contract.}
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suite "Contracts":
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var token: TestToken
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var provider: JsonRpcProvider
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var snapshot: JsonNode
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var accounts: seq[Address]
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setup:
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provider = JsonRpcProvider.new()
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snapshot = await provider.send("evm_snapshot")
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accounts = await provider.listAccounts()
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let deployment = readDeployment()
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token = TestToken.new(!deployment.address(TestToken), provider)
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teardown:
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discard await provider.send("evm_revert", @[snapshot])
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test "can call view methods":
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let accounts = await provider.listAccounts()
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test "can call constant functions":
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check (await token.totalSupply()) == 0.u256
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check (await token.balanceOf(accounts[0])) == 0.u256
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check (await token.allowance(accounts[0], accounts[1])) == 0.u256
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test "can call non-constant functions":
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token = TestToken.new(token.address, provider.getSigner())
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await token.mint(accounts[1], 100.u256)
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check (await token.totalSupply()) == 100.u256
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check (await token.balanceOf(accounts[1])) == 100.u256
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test "can call non-constant functions without a signer":
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await token.mint(accounts[1], 100.u256)
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check (await token.balanceOf(accounts[1])) == 0.u256
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test "can call constant functions without a return type":
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token = TestToken.new(token.address, provider.getSigner())
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proc mint(token: TestToken, holder: Address, amount: UInt256) {.contract, view.}
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await mint(token, accounts[1], 100.u256)
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check (await balanceOf(token, accounts[1])) == 0.u256
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test "fails to compile when non-constant function has a return type":
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let works = compiles:
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proc foo(token: TestToken, bar: Address): UInt256 {.contract.}
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check not works
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