Django、Boto、S3：为什么我突然收不到响应？

Question

这件事让我很头疼，我搞不清楚问题出在哪里。AWS现在有点问题，但这个问题在那之前就已经存在了，而且现在依然表现得一样。

简单来说：我有一个管理后台的功能，可以上传图片到S3，并把图片的路径存储在数据库里。在我刚重启apache的时候，一切都运行得很好，大约能持续20分钟。然后它就停止工作了，页面只显示“等待来自域名的响应”。就这样，没有任何错误提示，只是一直在等待，直到我重启apache。重启后又能正常工作，直到再次停止，通常是在20分钟后。我发现这个问题和流量的多少或者插入、删除的次数没有关系。

下面是模型的代码：

class SampleImage(models.Model):
    def __unicode__(self):
        return self.name

    name = models.CharField(max_length=50)
    front_image = S3EnabledImageField(upload_to='samples')
    back_image = S3EnabledImageField(upload_to='samples')

S3EnabledImageField的代码：

class S3EnabledImageField(models.ImageField):
    def generate_filename(self, instance, filename):
        path_join = os.path.join(self.get_directory_name(), self.get_filename(filename))
        return path_join.replace("\\", "/")

    def __init__(self, bucket=settings.BUCKET_NAME, verbose_name=None, name=None, width_field=None, height_field=None, **kwargs):
        if settings.USE_AMAZON_S3:
            self.connection = S3Connection(settings.AWS_ACCESS_KEY_ID, settings.AWS_SECRET_ACCESS_KEY)
            if not self.connection.lookup(bucket):
                self.connection.create_bucket(bucket)
            self.bucket = self.connection.get_bucket(bucket)
            kwargs['storage'] = S3Storage(self.bucket)
        super(S3EnabledImageField, self).__init__(verbose_name, name, width_field, height_field, **kwargs)

S3Storage的代码：

class S3Storage(FileSystemStorage):
    def __init__(self, bucket=None, location=None, base_url=None):
        if location is None:
            location = settings.MEDIA_ROOT
        if base_url is None:
            base_url = settings.MEDIA_URL
        self.location = os.path.abspath(location)
        self.bucket = bucket
        self.base_url = base_url

    def _open(self, name, mode='rb'):
        class S3File(File):
            def __init__(self, key):
                self.key = key

            def size(self):
                return self.key.size

            def read(self, *args, **kwargs):
                return self.key.read(*args, **kwargs)

            def write(self, content):
                self.key.set_contents_from_string(content)

            def close(self):
                self.key.close()

        return S3File(Key(self.bucket, name))

    def _save(self, name, content):
        key = Key(self.bucket, name)
        if hasattr(content, 'temporary_file_path'):
            key.set_contents_from_filename(content.temporary_file_path())
        elif isinstance(content, File):
            key.set_contents_from_file(content)
        else:
            key.set_contents_from_string(content)
        key.make_public()

        return name

    def delete(self, name):
        self.bucket.delete_key(name)

    def exists(self, name):
        return Key(self.bucket, name).exists()

    def listdir(self, path):
        return [key.name for key in self.bucket.list()]

    def path(self, name):
        raise NotImplementedError

    def size(self, name):
        return self.bucket.get_key(name).size

    def url(self, name):
        return Key(self.bucket, name).generate_url(100000)

    def get_available_name(self, name):
        return name

django apache s3 aws image upload backend management response timeout storage solutions

Django、Boto、S3：为什么我突然收不到响应？

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