functions.yml

@@ -15,3 +15,7 @@ functions:
     lang: python3-flask
     handler: ./tapas
     image: ralsina/tapas:latest
+  tapas2:
+    lang: crystal
+    handler: ./tapas2
+    image: ralsina/tapas2:latest

tapas2/handler.cr

@@ -0,0 +1,7 @@
+require "json"
+
+class Handler
+  def run(req : String)
+    return JSON::Any.new("Hello, Crystal. You said: #{req}")
+  end
+end

tapas2/shard.yml

@@ -0,0 +1,7 @@
+name: crystal_faas_function
+version: 0.1.0
+
+# dependencies:
+#   pg:
+#     github: will/crystal-pg
+#     version: "~> 0.5"

template/crystal/Dockerfile

@@ -1,29 +1,30 @@
-FROM --platform=${TARGETPLATFORM:-linux/amd64} ghcr.io/openfaas/of-watchdog:0.9.10 as watchdog
+FROM crystallang/crystal:1.8.0 as builder
-FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine as build
+
+RUN apt update \
+    && apt install -y curl \
+    && echo "Pulling watchdog binary from Github." \
+    && curl -sSL https://github.com/openfaas/faas/releases/download/0.9.6/fwatchdog > /usr/bin/fwatchdog \
+    && chmod +x /usr/bin/fwatchdog
 
-RUN apk update && apk upgrade
-RUN apk add crystal shards
 WORKDIR /home/app
 COPY . .
 
 COPY function/shard.yml shard.yml
 RUN shards install
-RUN crystal build main.cr -o handler --release --static
+RUN crystal build main.cr -o handler --release
-RUN strip handler
+
+FROM crystallang/crystal:1.8.0
+RUN apt install ca-certificates
 
-FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine as ship
-RUN apk update && apk upgrade
 # Add non root user
-# Add non root user
+RUN adduser app
-RUN addgroup -S app && adduser app -S -G app
+RUN mkdir -p /home/app
-RUN chown app /home/app
 
 WORKDIR /home/app
 
-COPY --from=build /home/app/function/  .
+COPY --from=builder /usr/bin/fwatchdog   .
-COPY --from=build /home/app/handler    .
+COPY --from=builder /home/app/function/  .
-COPY --from=watchdog /fwatchdog /home/app/fwatchdog
+COPY --from=builder /home/app/handler    .
-RUN chmod +x /home/app/fwatchdog
 
 RUN chown -R app /home/app