Update KOSyncClient

frontend/random.lua

@@ -0,0 +1,33 @@
+-- A set of functions to extend math.random and math.randomseed.
+
+local random = {}
+
+-- Use current time as seed to randomlize.
+function random.seed()
+    math.randomseed(os.time())
+end
+
+random.seed()
+
+-- Return a UUID (v4, random).
+function random.uuid(with_dash)
+    local array = {}
+    for i = 1, 16 do
+        table.insert(array, math.random(256) - 1)
+    end
+    -- The 13th character should be 4.
+    array[7] = bit.band(array[7], 79)
+    array[7] = bit.bor(array[7], 64)
+    -- The 17th character should be 8 / 9 / a / b.
+    array[9] = bit.band(array[9], 191)
+    array[9] = bit.bor(array[9], 128)
+    if with_dash then
+        return string.format("%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
+                             unpack(array))
+    else
+        return string.format("%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
+                             unpack(array))
+    end
+end
+
+return random