Implementing a custom aws lambda runtime using Crystal

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Custom AWS lambda runtimes ...and a crystal demo Alexander Reelsen @spinscale [email protected]

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There is no serverless architecture. It's just someone else's execution environment. Alex R. THE TRUTH[TM]

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WHO DAT? About me ▸ Working distributed at Elastic since 2013 ▸ Elasticsearch developer ▸ Dislikes running own infrastructure ▸ Basketball & JVM fan, husband, dad

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AND NOW FOR A LESSON IN... Agenda ▸ Custom AWS Lambda runtimes ▸ Introduction into crystal lang ▸ A crystal based runtime

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AWS Lambda

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FAAS

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node.js

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python

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java

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JVM

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startup time

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dependencies

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JIT

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2015: custom runtime?

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node shim https://aws.amazon.com/blogs/compute/running-executables-in-aws-lambda/

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2018: custom runtime!

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all the languages!

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runtime flow

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CUSTOM RUNTIME

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CUSTOM RUNTIME AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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AWS ENDPOINT CUSTOM RUNTIME AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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AWS ENDPOINT CUSTOM RUNTIME GET /2018-06-01/runtime/invocation/next AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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AWS ENDPOINT CUSTOM RUNTIME GET /2018-06-01/runtime/invocation/next Lambda-Runtime-Aws-Request-Id: 123 { "body": "{ \"foo\": \"bar\" }", "requestContext": "{ ... }", "headers" : { ... } } AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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AWS ENDPOINT CUSTOM RUNTIME POST /2018-06-01/runtime/invocation/123/response { "body": "{ \"foo\": \"bar\" }", "headers" : { ... } } AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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AWS ENDPOINT CUSTOM RUNTIME POST /2018-06-01/runtime/invocation/123/response { "body": "{ \"foo\": \"bar\" }", "headers" : { ... } } HTTP OK 202 AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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AWS ENDPOINT CUSTOM RUNTIME POST /2018-06-01/runtime/invocation/123/error { "statusCode": 500, "body" : "..." } AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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AWS ENDPOINT CUSTOM RUNTIME POST /2018-06-01/runtime/init/error { "errorMessage" : "...", "errorType" : "..." } AWS_LAMBDA_RUNTIME_API=localhost:12345 _HANDLER="my_handler" /bin/bootstrap

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crystal

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readable

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fast

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statically typed

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batteries included

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testing

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benchmarks

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metaprogramming

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fibers

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channels

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boehm gc

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c bindings

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dependency mgmt

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web frameworks

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binaries

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static binaries

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demo

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summary

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easy

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$$$

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static binaries

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aws library

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examples

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static sites, dynamic

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slack hook

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github hook

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location tracking

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scheduled jobs

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emails

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reverse geocoder

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thank you

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HYPER HYPER Links ▸ https://docs.aws.amazon.com/lambda/latest/dg/runtimes-custom.html ▸ https://docs.aws.amazon.com/lambda/latest/dg/runtimes-walkthrough.html ▸ https://crystal-lang.org ▸ https://github.com/spinscale/crystal-aws-lambda ▸ AWS Lambda Under the Hood: https://www.youtube.com/watch?v=QdzV04T_kec ▸ Firecracker: https://ﬁrecracker-microvm.github.io/ ▸ Boehm GC: http://www.hboehm.info/gc/ ▸ FaastRuby: https://faastruby.io/getting-started-crystal/ ▸ Google Cloud Functions: https://github.com/sam0x17/gcf.cr ▸ Crystal on OpenFaas: https://github.com/TPei/crystal_openfaas