Add Ruby environment (#223)

Adds a Ruby environment and examples.

examples/ruby/events_to_slack.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+require 'net/http'
+require 'uri'
+require 'json'
+
+SLACK_BASE_URL = 'https://hooks.slack.com/'
+SLACK_WEBHOOK_PATH = 'YOUR RELATIVE PATH HERE' # Something like "/services/XXX/YYY/zZz123"
+
+def send_slack_message(message)
+	uri = URI.join(SLACK_BASE_URL, SLACK_WEBHOOK_PATH)
+	data = "{'channel': '#hackdays-serverless', 'username': 'fissionbot', 'text': \"#{message}\", 'icon_emoji': ':fission:'}"
+	res = Net::HTTP.post_form(uri, payload: data)
+	res.success?
+end
+
+def handler(context)
+	request = context.request
+
+	event_type = request.headers['X-Kubernetes-Event-Type']
+	object_type = request.headers['X-Kubernetes-Object-Type']
+
+	object = JSON.parse(request.body.read)
+	object_name = object.dig('metadata', 'name')
+	object_namespace = object.dig('metadata', 'namespace')
+
+	message = "#{event_type} #{object_type} #{object_namespace}/#{object_name}"
+
+	if send_slack_message(message)
+		"Slack message sent - #{message}"
+	else
+		Rack::Response.new(["Failed to send Slack message - #{message}"], 500).finish
+	end
+end

examples/ruby/hello.rb

@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+def handler
+  "Hello, world!\n"
+end

examples/ruby/request_data.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+def handler(context)
+  request = context.request
+  msg = <<~MSG
+    ---ENV---
+    #{request.env.map { |h| h.join('=') }.join("\n") }
+
+    ---HEADERS---
+    #{request.headers.map { |h| h.join(': ') }.join("\n") }
+
+    ---PARAMS---
+    #{request.params.map { |h| h.join('=') }.join("\n") }
+
+    --BODY--
+    #{request.body.read}
+  MSG
+
+  Rack::Response.new([msg]).finish
+end