无法捕获错误？：NodeJS/Hyperledger答案

【问题标题】：Error can't be catched?: NodeJS/Hyperledger无法捕获错误？：NodeJS/Hyperledger
【发布时间】：2020-04-06 08:45:27
【问题描述】：

隐藏错误的最佳方法是什么？

我想摆脱这个错误（隐藏它，或者如果有人知道问题出在哪里更好地解决它）：

    2019-12-12T17:43:54.626Z - error: [Orderer.js]: sendBroadcast - on error: "Error: 2 UNKNOWN: Stream removed\n    
    at Object.exports.createStatusError (/home/hl-root/fabric-samples/fullgear-4node-setup/app/node_modules/grpc/src/common.js:91:15)\n    
    at ClientDuplexStream._emitStatusIfDone (/home/hl-root/fabric-samples/fullgear-4node-setup/app/node_modules/grpc/src/client.js:233:26)\n    
    at ClientDuplexStream._receiveStatus (/home/hl-root/fabric-samples/fullgear-4node-setup/app/node_modules/grpc/src/client.js:211:8)\n    
    at Object.onReceiveStatus (/home/hl-root/fabric-samples/fullgear-4node-setup/app/node_modules/grpc/src/client_interceptors.js:1306:15)\n    
    at InterceptingListener._callNext (/home/hl-root/fabric-samples/fullgear-4node-setup/app/node_modules/grpc/src/client_interceptors.js:568:42)\n    
    at InterceptingListener.onReceiveStatus (/home/hl-root/fabric-samples/fullgear-4node-setup/app/node_modules/grpc/src/client_interceptors.js:618:8)\n    
    at /home/hl-root/fabric-samples/fullgear-4node-setup/app/node_modules/grpc/src/client_interceptors.js:1123:18"
Transaction submitted

我的代码如下：

    while {
         try {
            const gateway = new Gateway();
            await gateway.connect(ccpPath, { wallet, identity: 'user1', discovery: { enabled: true, asLocalhost: true } });
            const network = await gateway.getNetwork('mychannel');
            const contract = network.getContract('chaincode');
            await contract.submitTransaction('createTransaction', 'Transaction3', '1');
            console.log('Transaction submitted');
        }
        catch (error) {
                console.error(`Failed to submit transaction: ${error}`);
                process.exit(1);
            }
    }

我得到了错误，但是指令已经发出并且我得到了日期（所以捕获错误永远不会起作用？）

【问题讨论】：

标签： node.js error-handling try-catch hyperledger

【解决方案1】：

您的问题是 network.getContract 返回一个 Promise，所以这里发生的事情是您的代码在 Promise 解决之前移动通过该行，因此您的 try/catch 在引发错误之前完成，因此出现异常。试试这个：

while {
     try {
        const gateway = new Gateway();
        await gateway.connect(ccpPath, { wallet, identity: 'user1', discovery: { enabled: true, asLocalhost: true } });
        const network = await gateway.getNetwork('mychannel');
        const contract = await network.getContract('chaincode');
        await contract.submitTransaction('createTransaction', 'Transaction3', '1');
        console.log('Transaction submitted');
    }
    catch (error) {
            console.error(`Failed to submit transaction: ${error}`);
            process.exit(1);
        }
}

【讨论】：