It’s all Richard Seroter’s fault, I ended up dabbling with Golang! We were chatting about a use case using Google Cloud Workflows and a Cloud Run service implemented in Go. So it was the occasion to play a bit with Go. Well, I still don’t like error handling… But let’s rewind the story a bit!

Workflows is a fully-managed service/API orchestrator on Google Cloud. You can create some advanced business workflows using YAML syntax. I’ve built numerous little projects using it, and blogged about it. I particularly like its ability to pause a workflow execution, creating a callback endpoint that you can call from an external system to resume the execution of the workflow. With callbacks, you’re able to implement human validation steps, for example in an expense report application where a manager validates or rejects an expense from someone in their team (this is what I implemented in this article).