util.hashring: Support associating arbitrary data with nodes In this API, a 'node' is always a simple text string. Sometimes the caller may have a more complex structure representing a node, but the hash ring is really only concerned with the node's name. This API change allows :add_nodes() to take a table of `node_name = value` pairs, as well as the simple array of node names previously accepted. The 'value' of the selected node is returned as a new second result from :get_node(). If no value is passed when a node is added, it defaults to `true` (as before, but this was never previously exposed).

     1

-- This tests the format, not the randomness

     2

     3

local uuid = require "util.uuid";

     4

     5

describe("util.uuid", function()

     6

	describe("#generate()", function()

     7

		it("should work follow the UUID pattern", function()

     8

			-- https://www.rfc-editor.org/rfc/rfc4122.html#section-4.4

     9

    10

			local pattern = "^" .. table.concat({

    11

				string.rep("%x", 8),

    12

				string.rep("%x", 4),

    13

				"4" .. -- version

    14

				string.rep("%x", 3),

    15

				"[89ab]" .. -- reserved bits of 1 and 0

    16

				string.rep("%x", 3),

    17

				string.rep("%x", 12),

    18

			}, "%-") .. "$";

    19

    20

			for _ = 1, 100 do

    21

				assert.is_string(uuid.generate():match(pattern));

    22

			end

    23

		end);

    24

	end);

    25

end);