[How-to] Middleware system for event handler in lua

Brouznouf · August 7, 2017, 2:49pm

This system will allow you to reduce common code around your Event Handlers.

Also if many agree to the same specification, it will allow better interoperability between modders and sharing of resources. Like a logger lib / fetching data lib / …

Here it is under a gist :

gist.github.com

https://gist.github.com/joelwurtz/2017abbb881e214c37dbeae3f0aabc0c

example.lua

MyAddEventHandler = Middleware.Builder(Middleware.Logger, Middleware.Identifier, Middleware.Sourcer, Middleware.Register)

-- This event will be log in console and automatically register if not existing
MyAddEventHandler('eventName', function (context, param1) 
    print(context.source) -- Source
    print(context.identifier) -- Steam id (or ip)
    
    -- Your code
end)

middleware.lua

Middleware = {}
local EventRegistry = {}
---
-- Handler that automatically register
-- @param eventName
-- @param next
--
function Middleware.Register(eventName, next)
    local hasEvent = false

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onlyserenity · October 2, 2017, 11:10pm

I like this! I’ll try it when I get home.