Unhandled 'error' event + exit!

[joelabair]

Firstly - Thanks for contributing this library. I'm having an odd issue though - exclusive to one rather large bit of HTML5 markup.

If I pass this in as an HTML string w/ siteType: 'html' - it dies. If I use a URL to the same content - no issue.

source: http://projects.postclick.net/~jbair/phantom-test.html

Node.js 10.5
└─┬ webshot@0.5.0
  └─┬ phantomjs@1.9.0-6
    ├── adm-zip@0.2.1
    ├── kew@0.1.7
    ├── mkdirp@0.3.5
    ├── ncp@0.4.2
    ├─┬ npmconf@0.0.24
    │ ├─┬ config-chain@1.1.7
    │ │ └── proto-list@1.2.2
    │ ├── inherits@1.0.0
    │ ├── ini@1.1.0
    │ ├─┬ nopt@2.1.1
    │ │ └── abbrev@1.0.4
    │ ├── once@1.1.1
    │ ├── osenv@0.0.3
    │ └── semver@1.1.4
    └─┬ rimraf@2.0.3
      └── graceful-fs@1.1.14

[joelabair]

bash >node
var fs = require('fs');
var webshot = require('webshot');
var htmlString = fs.readFileSync('../../public_html/phantom-test.html');
webshot(htmlString, './test.png', {siteType:'html'}, function(err) {
if(err) throw err;
console.log('done');
});

events.js:72
throw er; // Unhandled 'error' event
^
Error: spawn Unknown system errno 7
at errnoException (child_process.js:975:11)
at Process.ChildProcess._handle.onexit (child_process.js:766:34)

[brenden]

Hi, sorry for the late response.

There's an OS size limit on arguments passed to spawned processes, and it looks like htmlString is over the limit. You could still pass the filepath to phantom-test.html:

webshot('file://' + __dirname + '/phantom-test.html', './test.png', function(err) {
  if(err) throw err;
  console.log('done');
});

[joelabair]

Thanks for following up. That makes sense, if you're not using a unix pipe for the htmlString, and i'm not sure that named pipes are yet supported in node's process.child. It's worth noting the max length for htmlString in the docs. I did revert my code to use an http resource. I tried file:// first - and found http:// was more flexible for my situation.

Again, thanks for following up with the explanation.