Testing functions in crystal. Had to commit the template because it was outdated

.gitignore

@@ -161,4 +161,5 @@ cython_debug/
 
 .venv
 .vscode/
-template/
+build
+.secrets

functions.yml

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

tapas2/handler.cr

@@ -0,0 +1,21 @@
+require "http/request"
+require "http/headers"
+
+class Handler
+  def run(request : HTTP::Request)
+
+    if request.body.nil?
+      return {
+        body: "Foo",
+        status_code: 200,
+        headers: HTTP::Headers{"Content-Type" => "text/plain"},
+      }
+    end
+
+    {
+      body:        "Hello, Crystal. You said: #{request.body.try(&.gets_to_end)}",
+      status_code: 200,
+      headers:     HTTP::Headers{"Content-Type" => "text/plain"},
+    }
+  end
+end

tapas2/shard.yml

@@ -0,0 +1,2 @@
+name: crystal-http-template
+version: 0.1.0

template/crystal-http/Dockerfile

@@ -0,0 +1,37 @@
+FROM ghcr.io/openfaas/of-watchdog:0.9.11 as watchdog
+
+FROM crystallang/crystal:1.8.2
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
+
+ARG ADDITIONAL_PACKAGE
+RUN apt-get update \
+  && apt-get install -qy --no-install-recommends ${ADDITIONAL_PACKAGE}
+
+WORKDIR /home/app
+
+COPY . .
+COPY function/shard.yml shard.yml
+RUN shards install
+RUN crystal build main.cr -o handler --release
+
+# Create a non-root user
+RUN addgroup --system app \
+    && adduser --system --ingroup app app
+
+RUN chown app:app -R /home/app
+
+USER app
+
+WORKDIR /home/app
+
+ENV fprocess="./handler"
+EXPOSE 8080
+
+HEALTHCHECK --interval=2s CMD [ -e /tmp/.lock ] || exit 1
+
+ENV upstream_url="http://127.0.0.1:5000"
+ENV mode="http"
+
+CMD ["fwatchdog"]

template/crystal-http/function/handler.cr

@@ -0,0 +1,12 @@
+require "http/request"
+require "http/headers"
+
+class Handler
+  def run(request : HTTP::Request)
+    {
+      body:        "Hello, Crystal. You said: #{request.body.try(&.gets_to_end)}",
+      status_code: 200,
+      headers:     HTTP::Headers{"Content-Type" => "text/plain"},
+    }
+  end
+end

template/crystal-http/function/shard.yml

@@ -0,0 +1,2 @@
+name: crystal-http-template
+version: 0.1.0

template/crystal-http/main.cr

@@ -0,0 +1,41 @@
+require "http/server"
+require "./function/handler"
+
+server = HTTP::Server.new do |context|
+  response_triple : NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
+                    NamedTuple(body: String, headers: HTTP::Headers) |
+                    NamedTuple(body: String, status_code: Int32) |
+                    NamedTuple(body: String) |
+                    NamedTuple(headers: HTTP::Headers, status_code: Int32) |
+                    NamedTuple(headers: HTTP::Headers) |
+                    NamedTuple(status_code: Int32)
+
+  handler = Handler.new
+  response_triple = handler.run(context.request)
+
+  if response_triple.is_a?(NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
+                           NamedTuple(body: String, status_code: Int32) |
+                           NamedTuple(headers: HTTP::Headers, status_code: Int32) |
+                           NamedTuple(status_code: Int32))
+    context.response.status_code = response_triple[:status_code]
+  end
+
+  if response_triple.is_a?(NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
+                           NamedTuple(body: String, headers: HTTP::Headers) |
+                           NamedTuple(headers: HTTP::Headers, status_code: Int32) |
+                           NamedTuple(headers: HTTP::Headers))
+    response_triple[:headers].each do |key, value|
+      context.response.headers[key] = value
+    end
+  end
+
+  if response_triple.is_a?(NamedTuple(body: String, headers: HTTP::Headers, status_code: Int32) |
+                           NamedTuple(body: String, headers: HTTP::Headers) |
+                           NamedTuple(body: String, status_code: Int32) |
+                           NamedTuple(body: String))
+    context.response.print(response_triple[:body])
+  end
+end
+
+server.bind_tcp "0.0.0.0", 5000
+server.listen

template/crystal-http/template.yml

@@ -0,0 +1,6 @@
+language: crystal
+fprocess: ./handler
+welcome_message: |
+  You have created a new function which uses crystal 1.0.0.
+  To include third-party dependencies, use a vendoring tool like shards:
+  shards documentation: https://github.com/crystal-lang/shards