Merge pull request #1702 from saltycrys/config

Config improvements

src/invidious/helpers/helpers.cr

@@ -115,6 +115,63 @@ class Config
       return false
     end
   end
+
+  def self.load
+    # Load config from file or YAML string env var
+    env_config_file = "INVIDIOUS_CONFIG_FILE"
+    env_config_yaml = "INVIDIOUS_CONFIG"
+
+    config_file = ENV.has_key?(env_config_file) ? ENV.fetch(env_config_file) : "config/config.yml"
+    config_yaml = ENV.has_key?(env_config_yaml) ? ENV.fetch(env_config_yaml) : File.read(config_file)
+
+    config = Config.from_yaml(config_yaml)
+
+    # Update config from env vars (upcased and prefixed with "INVIDIOUS_")
+    {% for ivar in Config.instance_vars %}
+        {% env_id = "INVIDIOUS_#{ivar.id.upcase}" %}
+
+        if ENV.has_key?({{env_id}})
+            # puts %(Config.{{ivar.id}} : Loading from env var {{env_id}})
+            env_value = ENV.fetch({{env_id}})
+            success = false
+
+            # Use YAML converter if specified
+            {% ann = ivar.annotation(::YAML::Field) %}
+            {% if ann && ann[:converter] %}
+                puts %(Config.{{ivar.id}} : Parsing "#{env_value}" as {{ivar.type}} with {{ann[:converter]}} converter)
+                config.{{ivar.id}} = {{ann[:converter]}}.from_yaml(YAML::ParseContext.new, YAML::Nodes.parse(ENV.fetch({{env_id}})).nodes[0])
+                puts %(Config.{{ivar.id}} : Set to #{config.{{ivar.id}}})
+                success = true
+
+            # Use regular YAML parser otherwise
+            {% else %}
+                {% ivar_types = ivar.type.union? ? ivar.type.union_types : [ivar.type] %}
+                # Sort types to avoid parsing nulls and numbers as strings
+                {% ivar_types = ivar_types.sort_by { |ivar_type| ivar_type == Nil ? 0 : ivar_type == Int32 ? 1 : 2 } %}
+                {{ivar_types}}.each do |ivar_type|
+                    if !success
+                        begin
+                            # puts %(Config.{{ivar.id}} : Trying to parse "#{env_value}" as #{ivar_type})
+                            config.{{ivar.id}} = ivar_type.from_yaml(env_value)
+                            puts %(Config.{{ivar.id}} : Set to #{config.{{ivar.id}}} (#{ivar_type}))
+                            success = true
+                        rescue
+                            # nop
+                        end
+                    end
+                end
+            {% end %}
+
+            # Exit on fail
+            if !success
+                puts %(Config.{{ivar.id}} failed to parse #{env_value} as {{ivar.type}})
+                exit(1)
+            end
+        end
+    {% end %}
+
+    return config
+  end
 end
 
 struct DBConfig