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Connecting to AppEngine Datastore in Development via Cloud Datastore API
Introduction
This question explores the feasibility of connecting to the AppEngine datastore from a GCE instance using the Cloud Datastore API in a local development environment. The following setup is provided:
Current Limitations
Unfortunately, this is currently not possible in the development environment for two reasons:
Workarounds
Use Protocol Version of Cloud Datastore API (Recommended)
Instead of relying on the Go client library, you can use the protocol version of the API by following proppy's suggestion:
This workaround allows you to use the Cloud Datastore Protobuf HTTP API, which is more stable than the Go client library. It can also enable testing with the gcd.sh tool in the development server, although you will have to craft the HTTP requests yourself. Note that this approach does not allow for datastore data sharing between your application and the Cloud Datastore in development.
Craft Direct HTTP Requests
If the API library proves to be incompatible with development, you can consider issuing direct HTTP calls to the datastore. This approach requires manual handling of request construction and JSON parsing, but it may be a viable option if other methods are not feasible.
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