使用BlobStore和端点将图像上传到Appengine数据存储区 [英] Upload image to Appengine Datastore using BlobStore and Endpoints

问题描述

如何使用blobStore将文件/图像上传到Appengine数据存储区?我正在使用Google Cloud Endpoints.

How can I upload a file/image to the Appengine Datastore using blobStore? I'm using Google Cloud Endpoints.

这是我的模特

class ProductImage(EndpointsModel):
    _message_fields_schema = ('product', 'enable', 'image')
    product = ndb.KeyProperty(Product)
    image = ndb.BlobKeyProperty(required=True)
    enable = ndb.BooleanProperty(default=True)

如何从API资源管理器中对其进行测试?在前端，我正在使用AngularJS.

How can I test it from API Explorer? At the frontend I'm using AngularJS.

推荐答案

我无法找到一种方法来使用 just 端点；我必须有一个混合服务器，该服务器具有部分端点应用程序，部分webapp2 blobstore_handlers应用程序.如果您按照Blobstore上载示例的说明使用webapp2素材，则可以使用.例如，流应为:

I couldn't figure out a way to do this with just Endpoints; I had to have a hybrid server with part-endpoints application, part-webapp2 blobstore_handlers application. If you use the webapp2 stuff as per the Blobstore upload examples for those parts, it works. For example, the flow should be:

1. 客户端请求上传URL(为此呼叫使用端点，并具有 它基本上会做blobstore.create_upload_url(PATH)
2. 客户端上传 图片到给定的URL，由您处理 blobstore_handlers.BlobstoreUploadHandler方法，该方法可退出 上传并转储blob_info.key()(例如，在JSON中)
3. 客户端调用createProduct或其他任何端点，然后传回 它刚收到的Blobkey，以及您其余的 ProductImage模型.您可能要在该方法中调用get_serving_url并将其存储在模型中，以后不要更改.
4. 然后，客户可以使用隐匿的服务网址来查看图像.

1. Client requests an upload URL (use Endpoints for this call, and have it basically do blobstore.create_upload_url(PATH)
2. Client uploads image to the given URL, which is handled by your blobstore_handlers.BlobstoreUploadHandler method, which pulls out the upload and dumps the blob_info.key() (in JSON, for example)
3. Client calls createProduct or whatever, an Endpoint, and passes back the blobkey it just received, along with the rest of your ProductImage model. You may want to call get_serving_url in that method and stash it in your model, it shouldn't change later.
4. Clients can then use that stashed serving url to view image.

另外，我在BlobKeyProperty中有很多"乐趣".在开发部署中，一切正常，但在生产"中，在存储的Blobkey上调用get_serving_url()时会出现无效的图像错误.我认为这可能是由于Blob实际上不是位图，并且开发人员不在意.

Also I had a lot of "fun" with the BlobKeyProperty. In dev deployments, everything worked fine, but in 'production', I'd get invalid image errors while calling get_serving_url() on the stored blobkey. I think this might be due to the blobs actually not being bitmaps, though, and dev not caring.

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