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temporal-go-sample

A Go ft. Docker sample for Temporal workflow with signal handling

Launch the Temporal

Temporal and Postgres are defined in the docker-compose.yaml file so we just need to run:

$ docker-compose up --build -d

Then 4 modules will be up: Postgres, Temporal, Temporal-admin-tools, and Temporal-ui.

Launch the Go server

The Go server will manage the workflows of Temporal and there are two types:

  • Workflow
  • Activity

The workflow will call activities that are implemented as standalone functions. To start the Go server, just run the simple command:

$ go run main.go

Then the Go server will listen on port 6000 and register all the workflows and activities. We can access the Temporal admin UI on http://localhost:8080 to see the workflows and debug them.

Test the workflow

The Go server exposes an endpoint /do-something to triage a workflow. We can call it via curl:

curl -i -X POST "http://localhost:6000/do-something"

Then the Go server will submit the workflow with 5 activities, and each activity will wait for the signal handling from the previous one to continue working on its logic.

And then in the Temporal admin UI, we will see a registered workflow DO_SOMETHING[uuid], and in detail, all event histories will be listed down there.

Notes: in real service, we should replace the UUID by a generating UUID function instead of hard coding uuid like the sample. Error handling, logging, and metrics collection are omitted in this sample for simplicity.