为什么我不能从 py-substrate-interface 发送外部函数?

Why can't I send an extrinsic from py-substrate-interface?

大家好,我正在努力通过 py-substrate-interface, but for some reason I keep getting an error while following the sample mentioned here 提交外部文件。 我的代码如下:

    def send_funds(self, destination, amount):
        self.log.info("Sending {} DOT to {} ...".format(amount, destination.strip()))
        substrate = self.create_substrate_instance(self.node_ws_port[0])

        keypair = Keypair.create_from_mnemonic('level payment mom grape proof display cause engage erupt rain hair arm')
        print(keypair)

        call = substrate.compose_call(
            call_module='Balances',
            call_function='transfer',
            call_params={
                'dest': destination,
                'value': ceil(amount * DOT)
            }
        )

        try:
            extrinsic = substrate.create_signed_extrinsic(call=call, keypair=keypair)
        except Exception as e:
            print(e)

        try:
            receipt = substrate.submit_extrinsic(extrinsic, wait_for_inclusion=True)
            self.log.info("Extrinsic '{}' sent and included in block '{}'".format(receipt.extrinsic_hash, receipt.block_hash))
            self.log.info("{} DOT sent to address: {}".format(amount, destination))
        except SubstrateRequestException as e:
            self.log.error("Failed to send: {}".format(e))

我在这里放了一个 try 和 except 块:

        try:
            extrinsic = substrate.create_signed_extrinsic(call=call, keypair=keypair)
        except Exception as e:
            print(e)

并且在 运行 此代码块时出现以下错误:

No more bytes available (offset: 80 / length: 72)

我该如何解决这个问题。

OK 进一步挖掘后发现问题与 parity-scale codec 中的编码有关,您需要根据您的运行时调整网络配置。 所以我改变了:

    def create_substrate_instance(self, wsport):
        return SubstrateInterface(
                    url=self.rpc_url + wsport,
                    ss58_format=42,
                    type_registry_preset='kusama',
                )

至:

    def create_substrate_instance(self, wsport):
        return SubstrateInterface(
                    url=self.rpc_url + wsport,
                    ss58_format=42,
                    type_registry_preset='substrate-node-template',
                )

成功了。

大多数时候 RemainingScaleBytesNotEmptyException 被引发,它与类型注册表相关。在 Substrate 运行 时代(如 Kusama、Polkadot 等)定义了特定类型,这些类型(尚未)在元数据中公开,因此库必须包含对这些类型原语的分解。

一些故障排除提示: