[英]nodejs handling multiple subprocess together
I have got a situation where i need to create n number of subpocess, for each subprocess i need to provide stdin data and expected output, the result of the subpocess is success, if the expected output is same as that of output produced. 我遇到一种情况,我需要创建n个子流程,对于每个子流程,我需要提供stdin数据和预期输出,如果预期输出与所产生的输出相同,则子流程的结果为成功。 If all such subprocess is success then the status need to be send to user. 如果所有此类子过程均成功,则需要将状态发送给用户。 How to do the above in nodejs in a nonblocking way? 如何以非阻塞方式在nodejs中执行上述操作?
Promises! 答应!
I personally use Bluebird, and here is an example that uses it too. 我个人使用了Bluebird,这也是一个使用它的示例。 I hope you understand it, feel free to ask when you do not :-) 希望您能理解,什么时候不问就可以:-)
var Promise = require('bluebird')
var exec = require('child_process').exec
// Array with input/output pairs
var data = [
['input1', 'output1'],
['input2', 'output2'],
...
]
var PROGRAM = 'cat'
Promise.some(data.map(function(v) {
var input = v[0]
var output = v[1]
new Promise(function(yell, cry) {
// Yes it is ugly, but exec is just saves many lines here
exec('echo "' + input + '" | ' + PROGRAM, function(err, stdout) {
if(err) return cry(err)
yell(stdout)
})
}).then(function(out) {
if(out !== output) throw new Error('Output did not match!')
})
}), data.length) // Require them all to succeed
.then(function() {
// Send succes to user
}).catch(function() {
// Send failure to the user
})
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