Changed crystal template, picked latest flask one

template/crystal/Dockerfile

@@ -0,0 +1,38 @@
+FROM crystallang/crystal:1.8.0 as builder
+
+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
+
+WORKDIR /home/app
+COPY . .
+
+COPY function/shard.yml shard.yml
+RUN shards install
+RUN crystal build main.cr -o handler --release
+
+FROM crystallang/crystal:1.8.0
+RUN apt install ca-certificates
+
+# Add non root user
+RUN adduser app
+RUN mkdir -p /home/app
+
+WORKDIR /home/app
+
+COPY --from=builder /usr/bin/fwatchdog   .
+COPY --from=builder /home/app/function/  .
+COPY --from=builder /home/app/handler    .
+
+RUN chown -R app /home/app
+
+USER app
+
+ENV fprocess="./handler"
+EXPOSE 8080
+
+HEALTHCHECK --interval=2s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["./fwatchdog"]

template/crystal/function/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

template/crystal/function/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/main.cr

@@ -0,0 +1,11 @@
+# Copyright (c) Thomas Peikert 2018. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+require "json"
+require "./function/handler"
+
+req = STDIN.gets_to_end
+handler = Handler.new
+res = handler.run req
+
+puts res

template/crystal/template.yml

@@ -0,0 +1,6 @@
+language: crystal
+fprocess: ./handler
+welcome_message: |
+  You have created a new function which uses crystal 1.7.3 🎉
+  To include third-party dependencies, use a vendoring tool like shards:
+  shards documentation: https://github.com/crystal-lang/shards