add promise example

Author: william

examples/promise.lua

@@ -0,0 +1,17 @@
+#!/usr/bin/env lua
+
+local cqueues = require"cqueues"
+local promise = require"cqueues.promise"
+local resolver = require"cqueues.dns.resolver"
+local auxlib = require"cqueues.auxlib"
+
+local host, type = ...
+
+assert(cqueues.new():wrap(function ()
+	-- use fully recursive resolver to make sure it takes awhile
+	local pkt = promise.new(function (host, type)
+		return resolver.root():query(host, type)
+	end, host or "parliament.uk", type or "MX")
+
+	print(auxlib.tostring(pkt))
+end):loop())