使用节点child_process的stdout缓冲区问题 [英] Stdout buffer issue using node child_process

问题描述

我正在尝试使用节点child_process执行curl，以从本地网络中的共享文件夹获取JSON文件（大约220Ko）。但它实际上返回了一个我无法解决的缓冲问题。
这是我的代码：

I'm trying to execute curl using node child_process to get a JSON file (about 220Ko) from a shared folder in a local network. But it actually returns a buffer problem that I can't get throught. Here is my code:

var exec = require('child_process').exec;

var execute = function(command, callback){
    exec(command, function(error, stdout, stderr){ callback(error, stdout); });
};

execute("curl http://" + ip + "/file.json", function(err, json, outerr) {
    if(err) throw err;
    console.log(json);
})

这是我得到的错误：

if(err) throw err;
          ^
Error: stdout maxBuffer exceeded.
    at Socket.<anonymous> (child_process.js:678:13)
    at Socket.EventEmitter.emit (events.js:95:17)
    at Socket.<anonymous> (_stream_readable.js:746:14)
    at Socket.EventEmitter.emit (events.js:92:17)
    at emitReadable_ (_stream_readable.js:408:10)
    at emitReadable (_stream_readable.js:404:5)
    at readableAddChunk (_stream_readable.js:165:9)
    at Socket.Readable.push (_stream_readable.js:127:10)
    at Pipe.onread (net.js:526:21)

推荐答案

你需要使用 child_process.exec 时使用和设置 maxBuffer 选项。来自文档：

You need to use and set the maxBuffer option when using child_process.exec. From the documentation:

maxBuffer 指定stdout或stderr上允许的最大数据量 - 如果超过此值，子进程将被终止。

maxBuffer specifies the largest amount of data allowed on stdout or stderr - if this value is exceeded then the child process is killed.

该文档还指出 maxBuffer 的默认值为200KB。

The documentation also states that the default value of maxBuffer is 200KB.

例如，在以下代码中，最大缓冲区大小增加到500KB：

As an example, the maximum buffer size is increased to 500KB in the following code:

var execute = function(command, callback){
    exec(command, {maxBuffer: 1024 * 500}, function(error, stdout, stderr){ callback(error, stdout); });
};

此外，您可能想了解 http.get ，了解它是否能够实现您的目标。

Additionally, you may want to read about http.get to see if it is capable of achieving what you are trying to do.

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