local cjson = require "cjson"

counters = {}
local handle = io.popen("cat counters.json")
local json_text = handle:read("*a")
handle:close()
counters = cjson.decode(json_text)

function on_msg_receive(msg)
	if(counters[msg.from.phone] == nil) then
		counters[msg.from.phone] = 1
	else
		counters[msg.from.phone] = counters[msg.from.phone] + 1
		local f = assert(io.open("counters.json", "w"))
    local t = f:write(cjson.encode(counters))
    f:close()
	end
end