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| author | Kim Alvefur <zash@zash.se> | 2021-08-15 14:44:21 +0200 |
|---|---|---|
| committer | Kim Alvefur <zash@zash.se> | 2021-08-15 14:44:21 +0200 |
| commit | 3619de6000b340dbd71eb12849410cc9ffbbaa64 (patch) | |
| tree | 7d09bed3df2ea863097bab3b9765677b9be6afeb /util | |
| parent | 99d2ebb7315a6a05953722206795c402f3802472 (diff) | |
| download | prosody-3619de6000b340dbd71eb12849410cc9ffbbaa64.tar.gz prosody-3619de6000b340dbd71eb12849410cc9ffbbaa64.zip | |
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
Diffstat (limited to 'util')
| -rw-r--r-- | util/uuid.lua | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/util/uuid.lua b/util/uuid.lua index 41c2e9cd..a70750bb 100644 --- a/util/uuid.lua +++ b/util/uuid.lua @@ -8,8 +8,10 @@ local random = require "prosody.util.random"; local random_bytes = random.bytes; +local time = require "prosody.util.time"; local hex = require "prosody.util.hex".encode; local m_ceil = math.ceil; +local m_floor = math.floor; local function get_nibbles(n) return hex(random_bytes(m_ceil(n/2))):sub(1, n); @@ -24,7 +26,22 @@ local function generate() return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12); end +local function generate_v7() + -- Sortable based on time and random + -- https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-01#section-4.4 + local t = time.now(); + local unixts = m_floor(t); + local unixts_a = m_floor(unixts / 16); + local unixts_b = m_floor(unixts % 16); + local subsec = t % 1; + local subsec_a = m_floor(subsec * 0x1000); + local subsec_b = m_floor(subsec * 0x1000000) % 0x1000; + return ("%08x-%x%03x-7%03x-%4s-%12s"):format(unixts_a, unixts_b, subsec_a, subsec_b, get_twobits() .. get_nibbles(3), get_nibbles(12)); +end + return { + v4 = generate; + v7 = generate_v7; get_nibbles=get_nibbles; generate = generate ; -- COMPAT |