如何使一个套接字流？为了ImageMagick的后HTTPS响应连接到S3 [英] How to make a socket a stream? To connect https response to S3 after imagemagick

问题描述

我的节点和程序设计一般，我一直在真正与这个挣扎...

I am node and programming in general, and I have been really struggling with this...

我要带一个HTTPS响应，实：graphicsmagick调整其大小，并将其发送到我的Amazon S3的桶中。

I want to take a https response, resize it with graphicsmagick and send it to my amazon S3 bucket.

看来，HTTPS资源是IncomingMessage对象（我无法找到任何信息），并从实：graphicsmagick标准输出是一个插座。

It appears that the https res is an IncomingMessage object (I can't find any info about that) and the stdout from graphicsmagick is a Socket.

奇怪的是，我可以使用管道和这两个与本地路径发送到writeStream，双方资源和stdout创建一个不错的新调整后的图像。

The weird thing is that I can use pipe and send both of these to a writeStream with a local path, and both res and stdout create a nice new resized image.

和我甚至可以发送资源的S3（使用诺克斯）和它的作品。

And I can even send res to the S3 (using knox) and it works.

不过，标准输出并不想去的S3： - /

But stdout doesn't want to go to the S3 :-/

任何帮助将是AP preciated！

Any help would be appreciated!

https.get(JSON.parse(queryResponse).data.url,function(res){

    var headers = {
        'Content-Length': res.headers['content-length']
        , 'Content-Type': res.headers['content-type']
    }

    graphicsmagick(res)
      .resize('50','50')
      .stream(function (err, stdout, stderr) {

        req = S3Client.putStream(stdout,'new_resized.jpg', headers, function(err, res){
        })
        req.end()
    })

})

诺克斯 - 连接到S3 - https://github.com/LearnBoost/knox 实：graphicsmagick - 图像处理 - https://github.com/aheckmann/gm

knox - for connecting to S3 – https://github.com/LearnBoost/knox graphicsmagick - for image manipulation – https://github.com/aheckmann/gm

推荐答案

问题是与亚马逊需要知道前手的内容长度的事实（感谢DarkGlass）

The problem was with the fact that Amazon needs to know content length before hand (thanks DarkGlass)

不过，因为我的形象都比较小，我发现缓冲preferential到MultiPartUpload。

However, since my images are relatively small I found buffering preferential to MultiPartUpload.

我的解决办法：

https.get(JSON.parse(queryResponse).data.url,function(res){

    graphicsmagick(res)
      .resize('50','50')
      .stream(function (err, stdout, stderr) {

        ws. = fs.createWriteStream(output)

        i = []

        stdout.on('data',function(data){
          i.push(data)
        })

        stdout.on('close',function(){
          var image = Buffer.concat(i)

          var req = S3Client.put("new-file-name",{
             'Content-Length' : image.length
            ,'Content-Type' : res.headers['content-type']
          })

          req.on('response',function(res){  //prepare 'response' callback from S3
            if (200 == res.statusCode)
              console.log('it worked')
          })
          req.end(image)  //send the content of the file and an end
        })
    })
})

这篇关于如何使一个套接字流？为了ImageMagick的后HTTPS响应连接到S3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！