145 lines
4.4 KiB
Nim
145 lines
4.4 KiB
Nim
import std/macros
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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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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 new*(ContractType: type Contract,
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address: Address,
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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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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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proc createTransaction(contract: Contract,
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function: string,
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parameters: tuple): Transaction =
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let selector = selector(function, typeof parameters).toArray
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let data = @selector & AbiEncoder.encode(parameters)
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Transaction(to: contract.address, data: data)
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proc decodeResponse(T: type, bytes: seq[byte]): T =
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without decoded =? AbiDecoder.decode(bytes, 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(contract: Contract, function: string, parameters: tuple) {.async.} =
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let transaction = createTransaction(contract, function, parameters)
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discard await contract.provider.call(transaction)
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proc call(contract: Contract,
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function: string,
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parameters: tuple,
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ReturnType: type): Future[ReturnType] {.async.} =
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let transaction = createTransaction(contract, function, parameters)
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let response = await contract.provider.call(transaction)
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return decodeResponse(ReturnType, response)
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proc send(contract: Contract, function: string, parameters: tuple) {.async.} =
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if signer =? contract.signer:
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let transaction = createTransaction(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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else:
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await call(contract, function, parameters)
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func getParameterTuple(procedure: NimNode): NimNode =
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let parameters = procedure[3]
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var tupl = newNimNode(nnkTupleConstr, parameters)
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for parameter in parameters[2..^1]:
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for name in parameter[0..^3]:
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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 contract = procedure[3][1][0]
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let function = $basename(procedure[0])
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let parameters = getParameterTuple(procedure)
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let returntype = procedure[3][0]
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procedure[6] =
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if procedure.isConstant:
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if returntype.kind == nnkEmpty:
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quote:
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await call(`contract`, `function`, `parameters`)
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else:
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quote:
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return await call(`contract`, `function`, `parameters`, `returntype`)
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else:
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quote:
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await send(`contract`, `function`, `parameters`)
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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: Future[`returntype`]
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func addAsyncPragma(procedure: var NimNode) =
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let pragmas = procedure[4]
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if pragmas.kind == nnkEmpty:
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procedure[4] = newNimNode(nnkPragma)
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procedure[4].add ident("async")
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func checkReturnType(procedure: NimNode) =
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let returntype = procedure[3][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) # at least return type and contract instance
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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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contractcall.addAsyncPragma()
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contractcall
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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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