Go pipelines with Raku interfaces

So, let's say you're golang developer and want pure Go to write some CICD task:

cat task.go

package main

import "fmt"

func main() {
    fmt.Println("Hello, pipeline")
}

Go is cool, but there is one thing that makes it difficult to use in high level scenarios - its verbosity. Passing parameters to go tasks and return them back to main scenario takes some efforts and a lot of boilerplate code. It'd be good to keep main code concise and easy to read.

Rakulang in other hand is perfect language when it comes to munge data in and out, due it's extreme flexibility and expressiveness.

In this post I am going to show how to embed golang tasks into CICD pipelines, with a little help of Sparrow framework.

---

Let's, first of all, modify our golang task code, new version will be:

cat task.go

package main

import (
  "fmt"
  "github.com/melezhik/sparrowgo"
)

func main() {

  type Params struct {
    Message string
  }

  type Result struct {
    Message string
  }

  var params Params

  // sparrowgo takes care about passing 
  // input parameters from Raku to Go
  sparrowgo.Config(&params)

  // read params from pipeline
  fmt.Printf("Task params: %s\n", params.Message)

  // return results back to pipeline 
  sparrowgo.UpdateState(&Results{Message : "Hello from Go"})

}

All we've done here is utilized Sparrowgo package that "convert" golang task into Sparrow task with a benefits of passing and returning data from and to Rakulang.

---

Finally this how our pipeline will look like, now it's Raku part:

#!raku

my $s = task-run ".", %(
  :message<Hello from Raku>
);

say "Result: ", $s<Message>;

---

High level design.

Now, once we have some prove of concept code in place, we can get a high level picture of what our pipeline system could look like:

      [ Raku scenario to pass and handle data in and out ]
        \                    \                     \          
      task.go -> result -> task.go -> result -> task.go -> ...

So, we have the best of two worlds - Raku to write scenarios with less of code and Golang to do all heaving lifting where performance and strict type checking is required.

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