From 0f52ca1b2a94a8f51e4f35a780cad4d73be0d420 Mon Sep 17 00:00:00 2001
From: Luka Vandervelden <lukc@upyum.com>
Date: Thu, 14 May 2020 17:35:37 +0200
Subject: [PATCH] WIP ipc/json.

---
 src/json.cr | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 src/json.cr

diff --git a/src/json.cr b/src/json.cr
new file mode 100644
index 0000000..d657e27
--- /dev/null
+++ b/src/json.cr
@@ -0,0 +1,48 @@
+require "json"
+
+require "./ipc.cr"
+
+class IPC::JSON
+	include ::JSON::Serializable
+
+	@[::JSON::Field(ignored: true)]
+	getter       type = -1
+	class_getter type = -1
+
+	property     id   : ::JSON::Any?
+
+	macro message(id, type, &block)
+		class {{id}} < ::IPC::JSON
+			include ::JSON::Serializable
+
+			@@type = {{type}}
+			def type
+				@@type
+			end
+
+			{{yield}}
+		end
+	end
+end
+
+class IPC::Connection
+	def send(message : IPC::JSON)
+		send message.type.to_u8, message.to_json
+	end
+end
+
+# CAUTION: Only use this method on an Array(IPC::JSON.class)
+class Array(T)
+	def parse_ipc_json(messages : Array(IPC::JSON.class), message : IPC::Message) : IPC::JSON?
+		message_type = find &.type.==(message.utype)
+
+		payload = String.new message.payload
+
+		if message_type.nil?
+			raise "invalid message type (#{message.utype})"
+		end
+
+		message_type.from_json payload
+	end
+end
+