https://github.com/TPei/crystal_openfaas

OpenFaaS template for the crystal programming language
https://github.com/TPei/crystal_openfaas

Last synced: about 1 month ago
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OpenFaaS template for the crystal programming language

• Host: GitHub
• URL: https://github.com/TPei/crystal_openfaas
• Owner: TPei
• License: mit
• Created: 2018-10-02T12:31:59.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2024-04-29T04:01:35.000Z (8 months ago)
• Last Synced: 2024-05-21T01:05:01.089Z (7 months ago)
• Language: Shell
• Size: 51.8 KB
• Stars: 22
• Watchers: 2
• Forks: 5
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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• awesome-crystal - crystal_openfaas - Template to enable crystal as first class citizens in OpenFaaS (Serverless Computing)

README

        
# Crystal OpenFaaS Template  [![Runs on Crystal](https://repology.org/badge/version-for-repo/alpine_edge/crystal-lang.svg)](https://repology.org/project/crystal-lang/versions)

Inofficial OpenFaaS template for the crystal programming language 🎉

To find out more about the OpenFaaS templates see the [faas templates](https://github.com/openfaas/templates) and [faas-cli](https://github.com/openfaas/faas-cli).

## Usage

Go to your openFaaS project and execute:

```

faas-cli template pull https://github.com/TPei/crystal_faas_template

```

Alternatively, the template is also available via the OpenFaaS template store

```

faas-cli template store pull crystal

```

This will pull the template into your directory and allow you to use

```

faas-cli new --lang crystal my_function

```

to create a new crystal function

See [crystal_faas_whalesay_demo](https://github.com/TPei/crystal_faas_whalesay_demo) for an implementation example.

## Which version of crystal is this running?

It installs the latest version [available on alpine](https://pkgs.alpinelinux.org/packages?name=crystal).

## Development

### General

As with all OpenFaaS templates, this template creates a `my_function/handler.cr` file, as well as a `my_function.yml`. In addition to this, a `my_function/shard.yml` is created for your dependencies.

When building your function with `faas-cli build -f my_function.yml` your dependencies will be resolved according to your shard file.

### Code

`Hander#run` gets passed a `req` String, if you want to handle json, simply do `JSON.parse(req)` and do your thing :)

Your function always needs to return JSON, like so: `return JSON::Any.new("Just a String, but JSON!")`

```crystal

require "json"

class Handler

  def run(req : String)

    whale = <<-WHALE

     #{"-" * req.size}

    < #{req} >

     #{"-" * req.size}

           \\

            \\

             \\

              \\       ##               .

               \\## ## ##             ==

              ## ## ## ## ##         ===

           /"""""""""""""""""\\___/ ====

    ~~~ ~~{~ ~~~  ~~~~~ ~~~~~ ~~~/~~====-~ ~~~~

           \\______ O           __/

            \\    \\         __/

             \\____\\_______/

    WHALE

    return JSON::Any.new(whale)

  end

end

```

## Templates Developers / Contributors

See [contributing

guide](https://github.com/openfaas/templates/blob/master/CONTRIBUTING.md).

## License

This project is licensed under the MIT License.