This repository supports the Go runtime for Managed VMs on App Engine. It provides APIs for interacting with App Engine services. Its canonical import path is google.golang.org/appengine.

See https://groups.google.com/d/topic/google-appengine/gRZNqlQPKys/discussion for more information.

The top level directory of this repository is the appengine package. It contains the basic types (e.g. appengine.Context) that are used across APIs. Specific API packages are in subdirectories (e.g. datastore).

There is an internal subdirectory that contains service protocol buffers, plus packages required for connectivity to make API calls. App Engine apps should not directly import any package under internal.

This section describes how to update a traditional Go App Engine app to run on Managed VMs.

The app.yaml file (and YAML files for modules) should have these new lines added:

vm: true
manual_scaling:
  instances: 1

See [https://developers.google.com/appengine/docs/go/modules/#Go_Instance_scaling_and_class] for details.

The import paths for App Engine API packages need to be made relative to google.golang.org/appengine. You can do that manually, or by running this command to recursively update all Go source files in the current directory: (may require GNU sed)

sed -i '/"appengine/{s,"appengine,"google.golang.org/appengine,;s,appengine_,appengine/,}' \
  $(find . -name '*.go')