Skeleton of basic functionality, all as TODOs
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shard.lock
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shard.lock
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version: 2.0
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shards:
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commander:
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git: https://github.com/mrrooijen/commander.git
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version: 0.4.0
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crystar:
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git: https://github.com/naqvis/crystar.git
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version: 0.4.0
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docr:
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git: https://github.com/marghidanu/docr.git
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version: 0.1.1+git.commit.59fb466b748d5d29a8f2de88a54b71dbfe0285aa
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@ -6,8 +6,15 @@ authors:
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targets:
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faaso:
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main: src/faaso.cr
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main: src/main.cr
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crystal: '>= 1.12.2'
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license: MIT
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dependencies:
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docr:
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github: marghidanu/docr
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commander:
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github: mrrooijen/commander
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67
src/faaso.cr
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src/faaso.cr
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require "commander"
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# TODO: Write documentation for `Faaso`
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module Faaso
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VERSION = "0.1.0"
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# TODO: Put your code here
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module Commands
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class Build
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@arguments : Array(String) = [] of String
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@options : Commander::Options
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def initialize(options, arguments)
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@options = options
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@arguments = arguments
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end
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def run
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@arguments.each do |arg|
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puts "Building function... #{arg}"
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# A function is a folder with stuff in it
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# TODO: decide template based on file extensions or other metadata
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# TODO: copy template and add function files to it
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# TODO: build Docker image
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# TODO: push Docker image to registry
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# TODO: return image name for testing
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end
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end
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end
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class Up
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@arguments : Array(String) = [] of String
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@options : Commander::Options
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def initialize(options, arguments)
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@options = options
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@arguments = arguments
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end
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def run
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@arguments.each do |arg|
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puts "Starting function... #{arg}"
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# TODO: Check that we have an image for the function
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# TODO: Start a container with the image
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# TODO: Run test for healthcheck
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# TODO: Map route in reverse proxy to function
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# TODO: Return function URL for testing
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end
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end
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end
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class Down
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@arguments : Array(String) = [] of String
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@options : Commander::Options
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def initialize(options, arguments)
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@options = options
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@arguments = arguments
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end
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def run
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@arguments.each do |arg|
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puts "Stopping function... #{arg}"
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# TODO: check if function is running
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# TODO: stop function container
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# TODO: delete function container
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# TODO: remove route from reverse proxy
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end
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end
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end
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end
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end
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36
src/main.cr
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src/main.cr
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require "commander"
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require "./faaso.cr"
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cli = Commander::Command.new do |cmd|
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cmd.use = "faaso"
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cmd.long = "Functions as a Service, Open"
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cmd.commands.add do |command|
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command.use = "build"
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command.short = "Build a function"
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command.long = "Build a function's Docker image and optionally upload it to registry"
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command.run do |options, arguments|
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Faaso::Commands::Build.new(options, arguments).run
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end
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end
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cmd.commands.add do |command|
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command.use = "up"
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command.short = "Start a function"
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command.long = "Start a function in a container"
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command.run do |options, arguments|
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Faaso::Commands::Up.new(options, arguments).run
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end
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end
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cmd.commands.add do |command|
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command.use = "down"
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command.short = "Stop a function"
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command.long = "Stop a function in a container"
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command.run do |options, arguments|
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Faaso::Commands::Down.new(options, arguments).run
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end
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end
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end
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Commander.run(cli, ARGV)
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39
templates/crystal-http/Dockerfile
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templates/crystal-http/Dockerfile
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FROM --platform=${TARGETPLATFORM:-linux/amd64} ghcr.io/openfaas/of-watchdog:0.9.10 as watchdog
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FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine as build
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ARG ADDITIONAL_PACKAGE
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COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
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RUN apk update && apk upgrade && apk add crystal shards openssl-dev ${ADDITIONAL_PACKAGE} && apk cache clean
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WORKDIR /home/app
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COPY function/shard.yml shard.yml
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RUN shards install
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COPY . .
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RUN crystal build main.cr -o handler --error-trace -p && rm -rf /root/.cache
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FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine as ship
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ARG ADDITIONAL_PACKAGE
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RUN apk update && apk upgrade && apk add openssl pcre2 libgcc gc libevent ${ADDITIONAL_PACKAGE} && apk cache clean
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# Add non root user
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# Add non root user
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RUN addgroup -S app && adduser app -S -G app
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WORKDIR /home/app
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USER app
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COPY --from=build /home/app/function/ .
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COPY --from=build /home/app/handler .
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COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
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ENV fprocess="./handler"
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ENV exec_timeout=30
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EXPOSE 8080
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HEALTHCHECK --interval=2s CMD [ -e /tmp/.lock ] || exit 1
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ENV upstream_url="http://127.0.0.1:5000"
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ENV mode="http"
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CMD ["fwatchdog"]
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12
templates/crystal-http/function/handler.cr
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templates/crystal-http/function/handler.cr
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require "http/request"
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require "http/headers"
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class Handler
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def run(request : HTTP::Request)
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{
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body: "Hello, Crystal. You said: #{request.body.try(&.gets_to_end)}",
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status_code: 200,
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headers: HTTP::Headers{"Content-Type" => "text/plain"},
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}
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end
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end
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2
templates/crystal-http/function/shard.yml
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2
templates/crystal-http/function/shard.yml
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name: crystal-http-template
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version: 0.1.0
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templates/crystal-http/main.cr
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templates/crystal-http/main.cr
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require "http/server"
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require "./function/handler"
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server = HTTP::Server.new do |context|
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response_triple : NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
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NamedTuple(body: String, headers: HTTP::Headers) |
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NamedTuple(body: String, status_code: Int32) |
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NamedTuple(body: String) |
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NamedTuple(headers: HTTP::Headers, status_code: Int32) |
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NamedTuple(headers: HTTP::Headers) |
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NamedTuple(status_code: Int32)
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handler = Handler.new
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response_triple = handler.run(context.request)
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if response_triple.is_a?(NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
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NamedTuple(body: String, status_code: Int32) |
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NamedTuple(headers: HTTP::Headers, status_code: Int32) |
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NamedTuple(status_code: Int32))
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context.response.status_code = response_triple[:status_code]
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end
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if response_triple.is_a?(NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
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NamedTuple(body: String, headers: HTTP::Headers) |
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NamedTuple(headers: HTTP::Headers, status_code: Int32) |
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NamedTuple(headers: HTTP::Headers))
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response_triple[:headers].each do |key, value|
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context.response.headers[key] = value
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end
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end
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if response_triple.is_a?(NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
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NamedTuple(body: String, headers: HTTP::Headers) |
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NamedTuple(body: String, status_code: Int32) |
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NamedTuple(body: String))
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context.response.print(response_triple[:body])
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end
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end
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server.bind_tcp "0.0.0.0", 5000
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server.listen
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6
templates/crystal-http/template.yml
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6
templates/crystal-http/template.yml
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language: crystal
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fprocess: ./handler
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welcome_message: |
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You have created a new function which uses crystal 1.0.0.
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To include third-party dependencies, use a vendoring tool like shards:
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shards documentation: https://github.com/crystal-lang/shards
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