我正在尝试在我的ERC20代币合约上调用一种方法。我正在连接到'https://rinkeby.infura.io/'httpProvider。我可以调用()常量方法，但是当我想通过调用 send()函数来更改契约(Contract)状态时，出现此错误。如果您认为发布ABI JSON或Solidity契约(Contract)有帮助，我也可以提供。我以为我的问题完全与 web3 有关。我认为我需要(逻辑上)签署交易，但web3文档未提及任何内容。 http://web3js.readthedocs.io/en/1.0/web3-eth-contract.html#methods-mymethod-send
这是我一直得到的错误:
Unhandled rejection Error: Invalid JSON RPC response: ""
at Object.InvalidResponse (/opt/backend/node_modules/web3-core-helpers/src/errors.js:42:16)
at XMLHttpRequest.request.onreadystatechange (/opt/backend/node_modules/web3-providers-http/src/index.js:60:32)
at XMLHttpRequestEventTarget.dispatchEvent (/opt/backend/node_modules/xhr2/lib/xhr2.js:64:18)
at XMLHttpRequest._setReadyState (/opt/backend/node_modules/xhr2/lib/xhr2.js:354:12)
at XMLHttpRequest._onHttpResponseEnd (/opt/backend/node_modules/xhr2/lib/xhr2.js:509:12)
at IncomingMessage.<anonymous> (/opt/backend/node_modules/xhr2/lib/xhr2.js:469:24)
at emitNone (events.js:111:20)
at IncomingMessage.emit (events.js:208:7)
at endReadableNT (_stream_readable.js:1055:12)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickCallback (internal/process/next_tick.js:180:9)
From previous event:
at PromiEvent (/opt/backend/node_modules/web3-core-promievent/src/index.js:35:24)
at send (/opt/backend/node_modules/web3-core-method/src/index.js:446:21)
at Object._executeMethod (/opt/backend/node_modules/web3-eth-contract/src/index.js:890:24)
at Object.currencyToken.sendSignUpBonousTokens (/opt/backend/server/common/token/currency-token.js:86:56)
at <anonymous>
通过调用此方法:
const Web3 = require('web3');
const Tx = require('ethereumjs-tx');
const ABIjson = require('./ABI.json');
const web3 = new Web3(new Web3.providers.HttpProvider('https://rinkeby.infura.io/my_access_token_here'));
const contractAddress = '0x31cF32fa91286168B1A896Db4F99d106246932Bc';
const ownerAddress = '0x44Ba8c5a905D634c485dE6f8fD43df9682AfD342';
const token = new web3.eth.Contract(ABIjson, contractAddress);
try
{
const gasAmount = await token.methods.transfer(company.walletAddress, 10000).estimateGas({from: ownerAddress});
token.methods.transfer(company.walletAddress, 550).send(
{
from: ownerAddress,
gasPrice: '20000000000',
gas: gasAmount
})
.then(function(receipt)
{
console.log(receipt);
});
}
catch (error)
{
console.error(error);
}
这是该方法的ABI代码段:
{
"constant":false,
"inputs":[
{
"name":"_to",
"type":"address"
},
{
"name":"_value",
"type":"uint256"
}
],
"name":"transfer",
"outputs":[
{
"name":"success",
"type":"bool"
}
],
"payable":true,
"stateMutability":"payable",
"type":"function"
},
最佳答案
@sam k，这是您可能正在寻找的更好，更全面的解决方案。
我在给定的代码片段中注意到了一件重要的事情，您的代码中没有包含httpProvider行，这可能就是原因(也可能有其他原因)。因此，请添加下面提到的行。
let contractABI = <your contract ABI>;
let contractInstance = new web3.eth.Contract(contractABI,
contractAddress);
/**The line below needs to be added, specifying the http provider*/
contractInstance.setProvider(new Web3.providers.HttpProvider(URL));
现在是您要“签署”对契约(Contract)施加“状态”更改的交易的部分。因此，您可以按照以下代码结构进行交易签名。
web3.eth.getTransactionCount(ownerAddress).then( (nonce) => {
let encodedABI =
contractInstance.methods.statechangingfunction(<arguments>).encodeABI();
/**Estimating the required gas automatically from the network itself*/
contractInstance.methods.statechangingfunction(<arguments>).estimateGas({ from: ownerAddress }, (error, gasEstimate) => {
let tx = {
to: contractAddress,
gas: gasEstimate,
data: encodedABI,
nonce: nonce
};
/** Signing the transaction with the "privateKey" of the owner*/
web3.eth.accounts.signTransaction(tx, privateKey, (err, resp) => {
if (resp == null) {console.log("Error!");
} else {
let tran = web3.eth.sendSignedTransaction(resp.rawTransaction);
tran.on('transactionHash', (txhash) => {console.log("Tx Hash: "+ txhash);});
如果您其余的代码都没问题，则此解决方案应该可以使用。如果情况并非如此，我建议您在项目的存储库中评论github链接，以便我可以查看并提供解决方案。让我知道是否有帮助。
您可以引用以下官方web3链接:signTransaction，sendSignedTransaction，getTransactionCount和estimateGas。
关于javascript - 未处理的拒绝错误: Invalid JSON RPC response: ""，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/48217795/