UnhandledPromiseRejectionWarning: Error: Returned error: VM Exception while processing transaction: out of gas

[minji-o-j]

(node:37884) UnhandledPromiseRejectionWarning: Error: Returned error: VM Exception while processing transaction: out of gas
at Object.ErrorResponse (C:\Users\minji\Code\201810808\node_modules\web3-core-helpers\src\errors.js:29:16)
at C:\Users\minji\Code\201810808\node_modules\web3-core-requestmanager\src\index.js:166:36
at XMLHttpRequest.request.onreadystatechange (C:\Users\minji\Code\201810808\node_modules\web3-providers-http\src\index.js:110:13)
at XMLHttpRequestEventTarget.dispatchEvent (C:\Users\minji\Code\201810808\node_modules\xhr2-cookies\dist\xml-http-request-event-target.js:34:22)
at XMLHttpRequest._setReadyState (C:\Users\minji\Code\201810808\node_modules\xhr2-cookies\dist\xml-http-request.js:208:14)
at XMLHttpRequest._onHttpResponseEnd (C:\Users\minji\Code\201810808\node_modules\xhr2-cookies\dist\xml-http-request.js:318:14)
at IncomingMessage. (C:\Users\minji\Code\201810808\node_modules\xhr2-cookies\dist\xml-http-request.js:289:61)
at IncomingMessage.emit (events.js:322:22)
at endReadableNT (_stream_readable.js:1187:12)
at processTicksAndRejections (internal/process/task_queues.js:84:21)
(node:37884) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:37884) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

[minji-o-j]

use에서 오류나는 경우

이유: 예를 들어
await manage.methods.Order(accounts[3],307,"paper",9,28000).send({from: accounts[0], gas: 122209});
이란게 있으면 이 작업을 수행하기 위해서 gas: 122209 가 부족하다는 뜻이다.

따라서 얼마가 필요한지 알아보기 위하여

manage.methods.Order(accounts[3],307,"paper",9,28000).estimateGas(function(err, gas) {
        if(!err) console.log(">> gas: "+ gas);
    });

을 수행한 결과
>> gas: 188630 으로
122209보다 더 큰 gas가 필요한 것을 알았다.

따라서 gas를 188630으로 바꿔주면 잘 수행된다!

[minji-o-j]

deploy에서 오류나는 경우

new web3.eth.Contract(_abiArray).deploy({data: _bin}).estimateGas(function(err, gas) {
        if(!err) console.log(">> gas: "+ gas);
    });

을통해 send에 gas가 얼마나 필요한지 확인한다.

나같은 경우

var deployed = await new web3.eth.Contract(_abiArray)
        .deploy({data: _bin})
        .send({from: accounts[0], gas: 2000000})
        .on('transactionHash', function(hash){
            console.log(">>> transactionHash"+hash);
        })

였을 때 오류가 났는데, 출력해본 결과

>> gas: 2553135라고 뜬 것을 볼 수 있었다. 따라서

var deployed = await new web3.eth.Contract(_abiArray)
        .deploy({data: _bin})
        .send({from: accounts[0], gas: 2553135})
        .on('transactionHash', function(hash){
            console.log(">>> transactionHash"+hash);
        })

로 바꾸니 해결됨

[minji-o-j]

아니면 revert구문에 걸려서 생긴 오류일수도