ctable-test.lua

local ffi = require("ffi")
local ctable = require("lib.ctable")
local ipv4 = require("lib.protocol.ipv4")

local ip_t = ffi.typeof('uint8_t[4]')

local mac_sessionid_t = ffi.typeof([[
             struct {
                uint8_t  mac[6];
                uint16_t sessionid;
             } __attribute__((packed))
       ]])

function init_ip_hash(max_sessions)
    local max_occupy = 0.8
    local params = {
       key_type = ip_t,
       value_type = mac_sessionid_t,
       hash_fn =  ctable.hashv_32,
       initial_size = math.ceil(max_sessions / max_occupy),
       max_occupancy_rate = max_occupy,
    }
    return ctable.new(params)
end

local ip_hash = init_ip_hash(10000)

local ip1 = ipv4:pton("10.0.0.5")
local mac_sessionid = ffi.new(mac_sessionid_t)
mac_sessionid.sessionid = 42

print("add", ip_hash:add(ip1, mac_sessionid))
print("lookup", ip_hash:lookup_ptr(ip1))
print("key", ipv4:ntop(ip_hash:lookup_ptr(ip1).key))
print("value.sessionid", ip_hash:lookup_ptr(ip1).value.sessionid)
print("remove", ip_hash:remove(ip1))
print("lookup", ip_hash:lookup_ptr(ip1))