How to Deploy Google Cloud Functions with Go Modules in Go 1.11: Resolving Dependency Conflicts?

Deploying Google Cloud Functions with Go Modules in Go 1.11

Go modules provide a modernized approach to dependency management for Go projects. However, when deploying Google Cloud Functions with Go 1.11 using go modules, certain challenges arise.

Challenge: Incompatible Module Resolution

The Function Builder favors modules over vendored dependencies. However, when deploying a function that references a module in a parent directory (e.g., using a replace directive), the builder fails due to the module not being found within the function's isolated environment.

Solution: Vendor and Exclude Modules

To resolve this issue, it is recommended to vendor dependencies instead of using modules. Additionally, the go.mod and go.sum files should be excluded during the deployment process.

This can be achieved by creating a .gcloudignore file within the function's directory, as described in Google's documentation:

.gcloudignore
go.mod
go.sum

By ignoring these files, the Function Builder will exclude them from the deployment package, ensuring that vendored dependencies are used instead of modules.

Note: Ensure that the "go mod vendor" and "go mod verify" commands complete successfully locally before deployment to verify that all dependencies are correctly vendored.

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