How to Resolve Go Import Conflicts When Deploying to Google App Engine?

Resolving App Engine Import Conflicts

When deploying Go applications on Google App Engine, conflicts can arise due to different import paths during serving and testing.

Issue Description

To resolve these issues, consider the following options:

Option 1: Modify Import Paths (Recommended)

• In the main package (e.g., main.go), remove the source repository prefix from sub-folder package imports. For example, instead of github.com/markhayden/SampleIssue/lib1, use lib1.

Option 2: Externalize Dependencies

• Move sub-folder packages to independent projects outside the main project's source directory.
• Import these dependencies using full import paths (e.g., github.com/MarkHayden/SampleIssueDeps/lib1).

Implementation Details

Option 1:

• For example, in main.go:

  import (
    "fmt"
    "github.com/markhayden/SampleIssue/lib1" // Remove "github.com/markhayden/SampleIssue/"
    "github.com/markhayden/SampleIssue/lib2" // Remove "github.com/markhayden/SampleIssue/"
    "net/http"
  )

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Option 2:

• Let's assume dependencies are moved to the project SampleIssueDeps outside the main project's directory.

• In main.go:

  import (
    "fmt"
    "github.com/MarkHayden/SampleIssueDeps/lib1"
    "github.com/MarkHayden/SampleIssueDeps/lib2"
    "net/http"
  )

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Benefits and Considerations

Both options resolve import conflicts during serving and testing. Option 1 is simpler and maintains import conventions, while Option 2 allows for more modular dependency management.

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