Question

我编写了一个自定义文件字段AudioFileField。为此，我创建了一个检查文件是否真的是一个有效的audiofile。为了能够做到这一点，我使用sox命令行工具，所以我必须首先在磁盘上创建一个文件。由于sox依赖于后缀来进行验证，我需要使用原始后缀（而不是.upload）编写自己的TemporaryUploadedAudioFile：

class TemporaryUploadedAudioFile(TemporaryUploadedFile):
    """
       A file uploaded to a temporary location (i.e. stream-to-disk).
    """
    def __init__(self, name, content_type, size, charset, suffix='.upload'):
        """
            The init method overrides the name creation to allow passing
            an extension, so that sox is able to test the file
        """
        if settings.FILE_UPLOAD_TEMP_DIR:
            file = tempfile.NamedTemporaryFile(suffix=suffix,
                dir=settings.FILE_UPLOAD_TEMP_DIR)
        else:
            file = tempfile.NamedTemporaryFile(suffix=suffix)
        super(TemporaryUploadedFile, self).__init__(file, name, content_type, size, charset)

我用这个文件在AudioFileForm to_python方法中进行音频验证：

def to_python(self, data):
    """
       checks that the file-upload field data contains a valid audio file.
    """
    f = super(AudioFileForm, self).to_python(data)
    if f is None:
        return None

    # get the file suffix, sox needs this to be able to test the file
    suffix = os.path.splitext(data.name)[1]

    # We need to get a temporary file for sox. Even if we allready  have a temporary 
    # file, we have to create a new one ending with the correct suffix
    file = TemporaryUploadedAudioFile(data.name, data.content_type, 0, data.charset,suffix = suffix)
    with open(file.temporary_file_path(), 'w') as f:
        f.write(data.read())

    # Do the validation of the audiofile.
    filetype=subprocess.Popen([sox,'--i','-t','%s'%file.temporary_file_path()], shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    filetype=filetype.communicate()[0]
    filetype=filetype.replace('\n','')
    if not filetype in ['wav','aiff','flac']:
        raise forms.ValidationError('Not a valid audiofile (valid are: aif, flac & wav | 16 or 24 bit | 44.1 or 48 kHz)')
    return data

现在发生了奇怪的事情：这就像开发服务器上的魅力一样，但是当我切换到apache2 / mod_wsgi时它就会停止工作。 sox返回一个错误，告诉我文件丢失了。

我已经检查了权限，生产服务器上的tmp-location是/ tmp，所有权限都在那里被授予（777）。还有什么可以在这里发生？

Answer 1

已知mod-wsgi在标准输出方面存在问题，而且这个子进程与django有关。在stackoverflow.com中已经有很多问题得到解答。

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生产中无法访问创建临时文件

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