remove ffi imports

lua-tree/share/lua/5.1/kong/pdk/node.lua

@@ -3,7 +3,6 @@
 -- @module kong.node
 
 local utils = require "kong.tools.utils"
-local ffi = require "ffi"
 local private_node = require "kong.pdk.private.node"
 
 
@@ -15,9 +14,6 @@ local sort = table.sort
 local insert = table.insert
 local ngx = ngx
 local shared = ngx.shared
-local C             = ffi.C
-local ffi_new       = ffi.new
-local ffi_str       = ffi.string
 
 local NODE_ID_KEY = "kong:node_id"
 
@@ -234,16 +230,6 @@ local function new(self)
   -- @usage
   -- local hostname = kong.node.get_hostname()
   function _NODE.get_hostname()
-    local SIZE = 253 -- max number of chars for a hostname
-
-    local buf = ffi_new("unsigned char[?]", SIZE)
-    local res = C.gethostname(buf, SIZE)
-
-    if res == 0 then
-      local hostname = ffi_str(buf, SIZE)
-      return gsub(hostname, "%z+$", "")
-    end
-
     local f = io.popen("/bin/hostname")
     local hostname = f:read("*a") or ""
     f:close()