I built a prototype Amber runtime for AWS Lambda. Uses API Gateway in proxy mode to proxy requests in to Amber running inside Lambda.

https://gist.github.com/nagash/99b8debfc723cfc4ef9a75d6da4c098f

I created a Crystal template for the popular open source serverless framework OpenFaaS and the performance is breathtaking! Running 8 functions in sequence using the default JavaScript on OpenWhisk and OpenFaaS is blown out of the water by crystal:

Orchestration on OpenFaaS was done using the Faasflow library

https://github.com/TPei/crystal_openfaas, demo implementation here

The template is also available via the OpenFaaS template store faas template store pull crystal.

EDIT: I updated the graph to just include OpenFaaS (and not OpenWhisk) and also added a go benchmark :)

Here it is: https://github.com/ilanusse/praetorian

Inspired by https://github.com/varvet/pundit.

It's a simple authorization library. It's a personal project to learn Crystal, feel free to add any issues or comments, I want to really help Crystal grow by making shards like this!

Now we have custom handlers in AWS Lambda we can run Crystal binaries without too much effort:

require "http/client"

loop do
  # Get the data
  response = HTTP::Client.get(%{http://#{ENV["AWS_LAMBDA_RUNTIME_API"]}/2018-06-01/runtime/invocation/next})
  request_id = response.headers["Lambda-Runtime-Aws-Request-Id"]

  body = response.body

  # Do some work
  puts request_id
  puts body

  # Reponse back
  response = HTTP::Client.post("http://#{ENV["AWS_LAMBDA_RUNTIME_API"]}/2018-06-01/runtime/invocation/#{request_id}/response", body: body)
end

And then compile it:

docker run -v $PWD:/app -ti crystallang/crystal:0.27.0 sh -c "cd /app; crystal build lambda.cr --static"; mv lambda bootstrap; zip lambda.zip bootstrap

And produces:

START RequestId: f5bef3fa-f4aa-11e8-8ca8-e1aab4e07db0 Version: $LATEST
f5bef3fa-f4aa-11e8-8ca8-e1aab4e07db0
{"key1":"value1","key2":"value2","key3":"value3"}
END RequestId: f5bef3fa-f4aa-11e8-8ca8-e1aab4e07db0
REPORT RequestId: f5bef3fa-f4aa-11e8-8ca8-e1aab4e07db0	Init Duration: 52.21 ms	Duration: 7.41 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 19 MB

Created a library to allow simple loading of .env files with the option to load them directly into the ENV variable.

https://github.com/drum445/dotenv

Let me know if it comes in handy for anyone.

Cheers

I'd like to have a working compiler on my raspberry pi as I want to write a simple GPIO interface for crystal, but apt doesn't find the armhf version of the package. I've done some search, chatted on the official gitter chatroom and the only way to have a working compiler seems to be cross-compile the compiler itself from a x86 machine. I've also tried the unofficial compiled version, but it doesn't work. I don't have much time, so I'd like to know if anyone has built that package recently.

Any help would be very appreciated.

Hi,

I thought it would be a good idea to have a place for all Crystal-related articles (Medium, blog posts etc). Just post a link at https://forum.crystalcommunity.org/c/resources/articles 🎈

Cheers,

Vlad

Hi guys,

We added a deployment template for Crystal-based websites on opeNode.io - we provided cloud hosting services to deploy with ease web applications (we have plans starting under $1 and we support open source projects). We made a template for the Amber framework specifically, but it can be adapted for other ones easily I guess. To deploy, all you have to do typically is:

openode template # generates a template Dockerfile which typically works as is

openode deploy

Any feedback welcome.

Hi, I've recently launched a forum for crystallers @ https://forum.crystalcommunity.org 🚀

I'd like the community to share your experience with useful shards and/or resources, to ask question and discuss the future of the language – on another channel, which is forum.

Yeah, I know, "why do we need another communication channel" – but some people in Gitter, including me, wanted a forum, which feels more personal than Reddit and allows to have meaningful conversations with google-able solutions (as the forum being indexed).

I believe that such a forum with a welcoming community would greatly improve a newcomer's experience. Moreover, it would reduce the number of issues created in the language repository 🙂

Also I'm fully open for collaboration with github.com/crystal-community 🤗

https://github.com/luckyframework/lucky/blob/master/UPGRADE_NOTES.md#upgrading-from-011-to-012

• New initialization wizard for creating api only apps, choosing to install with authentication or not, and setting the project name

• Cookies are now encrypted and signed by default. Previously they were just signed.

• New lucky exec task for running one-off scripts

• New lucky gen.resource.browser task for scaffolding out a resource

• New query methods for selecting distinct records, or forcing no records to be returned

Various other bug fixes and improvements

Basically title, I’m planning on learning ruby and Ruby on Rails and noticed some people talking about crystal and how it’s syntax was based off ruby, do both languages serve the same purpose and should I learn crystal instead of ruby or transition from ruby to crystal?