index.js
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'use strict'
const child_process = require('child_process');
const RSCRIPT = 'Rscript';
const defaultOptions = {
verboseResult: false
}
function parseStdout(output) {
try {
output = output.substr(output.indexOf('"{'), output.lastIndexOf('}"'));
return JSON.parse(JSON.parse(output));
} catch (err) {
return err;
}
}
function callAsync (script, args, options) {
return new Promise((resolve, reject) => {
const result = args ?
child_process.spawn(RSCRIPT, [script, JSON.stringify(args)])
: child_process.spawn(RSCRIPT, [script]);
const ret = {
stdout: '',
stderr: ''
};
result.stdout.on('data', (output) => {
ret.stdout += output.toString();
});
result.stderr.on('data', (error) => {
ret.stderr += error.toString();
});
result.on('close', (singal) => {
if (singal == 0) {
ret.stdout = parseStdout(ret.stdout);
if (!(ret.stdout instanceof Error)) {
if (options.verboseResult) {
resolve({
pid: result.pid,
result: ret.stdout
});
} else {
resolve(ret.stdout);
};
} else {
reject({
pid: result.pid,
error: ret.stdout.message
});
}
} else if (singal == 1) {
reject({
pid: result.pid,
error: ret.stderr
});
} else {
reject({
pid: result.pid,
error: ret.stdout
});
}
});
});
}
function call(script, args, options, callback) {
if (options instanceof Function) {
callback = options;
options = undefined;
}
options = options || defaultOptions;
if (callback) {
callAsync(script, args, options)
.then(result => {
callback(null, result);
})
.catch(err => {
callback(err);
});
} else {
return callAsync(script, args, options);
}
}
function callSync(script, args, options) {
options = options || defaultOptions;
const result = args ?
child_process.spawnSync(RSCRIPT, [script, JSON.stringify(args)])
: child_process.spawnSync(RSCRIPT, [script]);
if (result.status == 0) {
const ret = parseStdout(result.stdout.toString());
if (!(ret instanceof Error)) {
if (options.verboseResult) {
return {
pid: result.pid,
result: ret
};
} else {
return ret;
};
} else {
return {
pid: result.pid,
error: ret.message
};
}
} else if (result.status == 1) {
return {
pid: result.pid,
error: result.stderr.toString()
};
} else {
return {
pid: result.pid,
error: result.stdout.toString()
};
}
}
module.exports.callSync = callSync;
module.exports.call = call;