How to Authenticate a Private Go Module on Google App Engine Standard Using Go 1.11?

Authenticating a Private Go Module on Google App Engine Standard Using Go 1.11

In Go 1.11, the introduction of modules provides a more efficient way of managing dependencies. However, when using private modules on Google App Engine Standard, authentication issues may arise. This issue becomes apparent when attempting to gcloud app deploy and encountering a 403 Forbidden error.

To resolve this issue, traditional approaches like vendoring or using third-party dependency management tools (e.g., DEP) have been employed. However, with the new module system, these solutions may not be ideal.

Solution Using Module Replace

Instead of dealing with credentials, a viable solution is to use Go's module replace functionality to direct GAE to use local code. This approach involves:

1. Setting Up Directory Structure:

   Organize your project with the following directory structure:

   myService/
   |__ src/
   |    |__ service.go
   |    |__ go.mod
   |__ build/
      |__ gae/
          |__ src/  // Symlink to ../../src
          |__ modules/  // Git ignored
          |__ app.go
          |__ go.mod
          |__ app.yaml

2. Modifying GAE go.mod:

   Create a go.mod file in the gae directory and specify the dependencies, including the local path for your private module using replace:

   module myServiceGAE
   
   require (
       bitbucket.org/me/myService v0.0.0
       google.golang.org/appengine v1.4.0
   )
   
   replace bitbucket.org/me/myService => ./src

3. Cloning or Copying Private Modules:

   In the modules folder under the gae directory, clone or copy your private modules before building the project.

This approach allows you to keep your private module code separate from your main project, while ensuring that GAE uses the correct version during deployment.

Pros:

• Decouples the private module from GAE, allowing for easier deployment to other platforms.
• Avoids the need for additional dependency management tools.

Cons:

• Becomes more complex when dealing with private modules with dependencies on other private modules.

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