how to save <httpfile> of video in python server

Question

In python tornado server,I got a file of video(like:test.mp4) from client's request. And the type of file is 'tornado.httputil.HTTPFile'.

I want to save it to my server like './video/myvideo.mp4'. I know opencv videoCapture may could do that,but didn't use the APIs well.

Answer 1

You can save files by using Python's built-in open() function, like:

with open('myfile.txt', 'w') as f:
    f.write('Hello world')

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A simple Tornado example:

class UploadHandler(tornado.web.RequestHandler):
    # ...
    def post(self):
        for field_name, files in self.request.files.items():
            for info in files:
                filename = info['filename'] # name of the file

                # NOTE: as pointed out by Ben Darnell, if user submitted 
                # filename contains special characters like "../",
                # it poses a security risk. You should generate your 
                # own filenames. See `uuid.uuid4()`.

                body = info['body'] # contents of the file

                with open('video/%s' % filename, 'w') as f:
                    f.write(body)

        self.write('Upload successful')

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NOTE: If the uploaded files are large, you might face some problems. Read this - issue on GitHub. You can, however, use tornado.web.stream_request_body decorator to circumvent this issue, although I have neither any experience with that nor a working code example.