Re: mail fltering

[Sean Conner <sean@...>]

It was thus said that the Great Jim once stated:
> On 10/3/18, Sean Conner <sean@conman.org> wrote:
> > That's new to me, since I use Lua to process SIP messages for Verizon
> > Wireless.  It currently handles around 60,000,000 messages per day without
> > issue (and we expect that level to rise 10-fold over the next year).
> 
> given these sheer numbers you were not talking about emails, right ?

  Right.  SIP is (basically) a telephony protocol use mostly to connect
callers over non-legacy (non-SS7 basically) networks.  What's nice about Lua
is that each transaction is handled via a coroutine driven by a network
event loop (itself written in Lua [1]).  Parsing is handled by LPEG.

> i wonder if there is a Lua based smtpd available anywhere ?
> akin to Haraka (JS), qpsmtpd or ASSP (Perl) ?
> 
> i only know that mailfront (
> http://www.untroubled.org/mailfront/
> ) can use Lua scripts for mail filtering.
> 
> any other projects ?

  I'm unaware of any other projects, but I do have LPEG code to parse
emails:

	https://github.com/spc476/LPeg-Parsers/blob/master/email.lua

available via LuaRocks: "org.conman.parsers.email".

  -spc 

[1]	https://github.com/spc476/lua-conmanorg/blob/master/lua/nfl.lua [2]

[2]	No sample code uploaded yet, but here's a sample echo server using
	the above module:

	local signal = require "org.conman.signal"
	local nfl    = require "org.conman.nfl"
	local tcp    = require "org.conman.nfl.tcp"

	-- ----------------------------------------------------------
	-- This function will run in a coroutine until the other side
	-- disconnects.
	-- ----------------------------------------------------------

	local function echo(ios)
	  local data = ios:read("*l")
	  if data and ios:write(data,"\r\n") then
	    return echo(ios)
	  end
	  ios:close()
	end
	
	signal.catch('int') -- so we can interrupt the program to stop it
	
	tcp.listen('0.0.0.0','echo',echo)
	nfl.server_event(function() return signal.caught() end)