From 3619de6000b340dbd71eb12849410cc9ffbbaa64 Mon Sep 17 00:00:00 2001 From: Kim Alvefur Date: Sun, 15 Aug 2021 14:44:21 +0200 Subject: util.uuid: Add UUIDv7 Allows sorting by id as a substitute for sorting by timestamp since it has the timestamp in the encoded in the first part, and only things that happen extremely close together may get out of order by such a sort, which might not matter. From draft-ietf-uuidrev-rfc4122bis formerly draft-peabody-dispatch-new-uuid-format --- spec/util_uuid_spec.lua | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'spec') diff --git a/spec/util_uuid_spec.lua b/spec/util_uuid_spec.lua index 46400d00..7157d0ec 100644 --- a/spec/util_uuid_spec.lua +++ b/spec/util_uuid_spec.lua @@ -20,6 +20,28 @@ describe("util.uuid", function() for _ = 1, 100 do assert.is_string(uuid.generate():match(pattern)); end + + assert.truthy(uuid.generate() ~= uuid.generate(), "does not generate the same UUIDv4 twice") + end); + end); + describe("#v7", function() + it("should also follow the UUID pattern", function() + local pattern = "^" .. table.concat({ + string.rep("%x", 8), + string.rep("%x", 4), + "7" .. -- version + string.rep("%x", 3), + "[89ab]" .. -- reserved bits of 1 and 0 + string.rep("%x", 3), + string.rep("%x", 12), + }, "%-") .. "$"; + + local one = uuid.v7(); -- one before the loop to ensure some time passes + for _ = 1, 100 do + assert.is_string(uuid.v7():match(pattern)); + end + -- one after the loop when some time should have passed + assert.truthy(one < uuid.v7(), "should be ordererd") end); end); end); -- cgit v1.2.3