| # resty/uuid.lua
local ffi = require "ffi"
local ffi_new = ffi.new |
| local ffi_str = ffi.string |
| local ffi_load = ffi.load |
| local ffi_cdef = ffi.cdef |
| local C = ffi.C |
| local os = ffi.os |
| local tonumber = tonumber |
| local setmetatable = setmetatable |
|
|
| ffi_cdef[[ |
| typedef unsigned char uuid_t[16]; |
| typedef long time_t; |
| typedef struct timeval { |
| time_t tv_sec; |
| time_t tv_usec; |
| } timeval; |
| void uuid_generate(uuid_t out); |
| void uuid_generate_random(uuid_t out); |
| void uuid_generate_time(uuid_t out); |
| int uuid_generate_time_safe(uuid_t out); |
| int uuid_parse(const char *in, uuid_t uu); |
| void uuid_unparse(const uuid_t uu, char *out); |
| int uuid_type(const uuid_t uu); |
| int uuid_variant(const uuid_t uu); |
| time_t uuid_time(const uuid_t uu, struct timeval *ret_tv); |
| ]] |
|
|
| local lib = os == "OSX" and C or ffi_load "uuid" |
| local uid = ffi_new "uuid_t" |
| local tvl = ffi_new "timeval" |
| local buf = ffi_new("char[?]", 36) |
|
|
| local uuid = {} |
| local mt = {} |
|
|
| local function unparse(id) |
| lib.uuid_unparse(id, buf) |
| return ffi_str(buf, 36) |
| end |
|
|
| local function parse(id) |
| return lib.uuid_parse(id, uid) == 0 and uid or nil |
| end |
|
|
| function uuid.generate() |
| lib.uuid_generate(uid) |
| return unparse(uid) |
| end |
|
|
| function uuid.generate_random() |
| lib.uuid_generate_random(uid) |
| return unparse(uid) |
| end |
|
|
| function uuid.generate_time() |
| lib.uuid_generate_time(uid) |
| return unparse(uid) |
| end |
|
|
| function uuid.generate_time_safe() |
| local safe = lib.uuid_generate_time_safe(uid) == 0 |
| return unparse(uid), safe |
| end |
|
|
| function uuid.type(id) |
| return lib.uuid_type(parse(id)) |
| end |
|
|
| function uuid.variant(id) |
| return lib.uuid_variant(parse(id)) |
| end |
|
|
| function uuid.time(id) |
| local secs = lib.uuid_time(parse(id), tvl) |
| return tonumber(secs), tonumber(tvl.tv_usec) |
| end |
|
|
| mt.__call = uuid.generate |
|
|
| return setmetatable(uuid, mt) |
