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Callback invoked multiple-times from call function. #8

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Callback invoked multiple-times from call function. #8

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7176371
Callback invoked multiple-times from call function.
prasad83 Mar 15, 2017
00e0b1a
Handled filtering of Error specifically.
prasad83 Mar 15, 2017
4278253
Timeout option to terminate long running script.
prasad83 Mar 31, 2017
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26 changes: 24 additions & 2 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,9 +29,31 @@ R.prototype.call = function(_opts, _callback) {
var opts = _.isFunction(_opts) ? {} : _opts;
this.options.env.input = JSON.stringify([this.d, this.path, opts]);
var child = child_process.spawn("Rscript", this.args, this.options);
child.stderr.on("data", callback);
var body = { out: "", err: "", timeout: false};
if (_opts.timeout) {
setTimeout(function(){
child.stdin.pause(); // Required to make sure KILL works
child.kill();
body.timeout = true;
}, _opts.timeout);
}
child.stderr.on("data", function(d){
body.err += d;
});
child.stdout.on("data", function(d) {
callback(null, JSON.parse(d));
body.out += d;
});
child.stderr.on("end", function(){
// NOTE: Warning or Info messages get caught in stderr!
if (body.err) {
body.err = body.err.toString();
if (body.err.indexOf('Error ') != -1) callback(new Error(body.err));
else body.err = null; // To let the stdout be sent to callback.
}
});
child.stdout.on("end", function() {
if (body.timeout) callback(new Error('Too long run... terminated'));
if (!body.err) callback(null, JSON.parse(body.out));
});
};

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