solcjs --standard-json - TypeError: Second argument needs to be a buffer

[Janaka-Steph]

Hello,

solcjs --standard-json myinput.json doesn't work. See the error bellow.

$ echo "{}" | solcjs --standard-json
/usr/local/lib/node_modules/solc/node_modules/graceful-fs/polyfills.js:144
        throw er
        ^

TypeError: Second argument needs to be a buffer
    at Object.fs.readSync (fs.js:681:18)
    at Object.readSync (/usr/local/lib/node_modules/solc/node_modules/graceful-fs/polyfills.js:138:28)
    at Object.<anonymous> (/usr/local/lib/node_modules/solc/solcjs:65:18)
    at Module._compile (module.js:569:30)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:503:32)
    at tryModuleLoad (module.js:466:12)
    at Function.Module._load (module.js:458:3)
    at Function.Module.runMain (module.js:605:10)
    at startup (bootstrap_node.js:158:16)

[axic]

Thanks, this seems to be a bug. solcjs --standardjson myinput.json will not work as it expects the content on the standard input (ie. piping). echo "{}" | solcjs --standard-json should work though.

[axic]

Will push a fix soon.

[munawarb]

Hi,
I'm trying to execute this command: echo "{}" | solcjs --standard-json but getting an error: Empty input was read.

[chriseth]

@munawarb the empty object is not enough, some of the fields are required. More information: https://solidity.readthedocs.io/en/develop/using-the-compiler.html#compiler-input-and-output-json-description

[axic]

The Empty input was read is part of solcjs though, which is being addressed in #127.

[mtbitcoin]

I am running into the exact issue, is there a workaround or fix?

[snd]

having the same issue.

is there any way to use the solcjs standard json interface at this point?

$ solcjs --version
0.4.24+commit.e67f0147.Emscripten.clang
$ echo "{}" | solcjs --standard-json
/usr/local/lib/node_modules/solc/node_modules/graceful-fs/polyfills.js:144
        throw er
        ^

TypeError: Second argument needs to be a buffer
    at Object.fs.readSync (fs.js:697:18)
    at Object.readSync (/usr/local/lib/node_modules/solc/node_modules/graceful-fs/polyfills.js:138:28)
    at Object.<anonymous> (/usr/local/lib/node_modules/solc/solcjs:65:18)
    at Module._compile (module.js:649:30)
    at Object.Module._extensions..js (module.js:660:10)
    at Module.load (module.js:561:32)
    at tryModuleLoad (module.js:501:12)
    at Function.Module._load (module.js:493:3)
    at Function.Module.runMain (module.js:690:10)
    at startup (bootstrap_node.js:194:16)

[munawarb]

Not that I know of. I just passed the source code as stdin. An example using Java:         ProcessBuilder processBuilder = new ProcessBuilder("solc", "--combined-json", "abi,bin", "--optimize");         processBuilder.redirectErrorStream(true);         Process process = processBuilder.start();         OutputStream stdin = process.getOutputStream();         stdin.write(smartContractCode.getBytes());         stdin.flush();         stdin.close();

[axic]

@snd there is the PR #127 trying to fix this, but no matter what, something works on Travis but doesn't work on a Mac, or vice versa, but mostly nothing works on Travis. Would you be interested in helping out?

[tzapu]

@axic i tried to fix the tests here #229, would love to be a be able to use standard jsons :D
thanks

[feuGeneA]

@axic , what's your disposition on this issue and the proposed fix?

I'm using the changes from @tzapu 's PR #229 , which seem to include your own changes as well, and it's all working for my purposes.

I'd love to see the fix merged into master so that I can go into production with my own development that's depending on it, and I see @snd and others are waiting on it as well.

Are there any reservations you have? Is there anything we can do to help facilitate?

[axic]

Here's the last comment on the issue: #127 (comment)