Use native Defold json encode and decode functions (#65)

* Added missing engine API function

* Replace Lua json with native Defold json

* Update example.script

* Update CHANGELOG.md

Co-authored-by: Tom Glenn <289945+tomglenn@users.noreply.github.com>

CHANGELOG.md

@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Use native Defold json encode and decode functions
+
 ### Added
 - Added optional native b64 encode and decode using extension-crypt if it exists
 

README.md

@@ -326,6 +326,8 @@ The engine module must provide the following functions:
   * `message` - Message to send
   * `callback` - Function to call with message returned as a response (message)
 
+* `uuid()` - Create a UUID
+
 
 ## API codegen
 

example/example.script

@@ -49,7 +49,7 @@ local function login(client)
 
 	local success = true
 
-	if session and nakama_session.is_token_expired_soon(session) and not nakama.is_refresh_token_expired(session) then
+	if session and nakama_session.is_token_expired_soon(session) and not nakama_session.is_refresh_token_expired(session) then
 		log("Session has expired or is about to expire. Refreshing.")
 		success = refresh_session(client, session)
 	elseif not session or nakama_session.is_refresh_token_expired(session) then

nakama/engine/defold.lua

@@ -22,6 +22,12 @@ local uri_decode = uri.decode
 
 uuid.seed()
 
+-- replace Lua based json.encode and decode with native Defold functions
+-- native json.encode function was added in Defold 1.3.7
+-- native json.decode function has been included in Defold "forever"
+json.encode = _G.json and _G.json.encode or json.encode
+json.decode = _G.json and _G.json.decode or json.decode
+
 local M = {}
 
 --- Get the device's mac address.