forked from zhurui/management
103 lines
2.9 KiB
JavaScript
103 lines
2.9 KiB
JavaScript
var assert = require('assert');
|
|
|
|
var uuid = require('../');
|
|
|
|
var log = console.log;
|
|
|
|
var generators = {
|
|
v1: uuid.v1,
|
|
v4: uuid.v4
|
|
};
|
|
|
|
var UUID_FORMAT = {
|
|
v1: /[0-9a-f]{8}-[0-9a-f]{4}-1[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/i,
|
|
v4: /[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/i
|
|
};
|
|
|
|
var N = 1e4;
|
|
|
|
// Get %'age an actual value differs from the ideal value
|
|
function divergence(actual, ideal) {
|
|
return Math.round(100*100*(actual - ideal)/ideal)/100;
|
|
}
|
|
|
|
function rate(msg, t) {
|
|
log(msg + ': ' + (N / (Date.now() - t) * 1e3 | 0) + ' uuids\/second');
|
|
}
|
|
|
|
for (var version in generators) {
|
|
var counts = {}, max = 0;
|
|
var generator = generators[version];
|
|
var format = UUID_FORMAT[version];
|
|
|
|
log('\nSanity check ' + N + ' ' + version + ' uuids');
|
|
for (var i = 0, ok = 0; i < N; i++) {
|
|
id = generator();
|
|
if (!format.test(id)) {
|
|
throw Error(id + ' is not a valid UUID string');
|
|
}
|
|
|
|
if (id != uuid.unparse(uuid.parse(id))) {
|
|
assert(fail, id + ' is not a valid id');
|
|
}
|
|
|
|
// Count digits for our randomness check
|
|
if (version == 'v4') {
|
|
var digits = id.replace(/-/g, '').split('');
|
|
for (var j = digits.length-1; j >= 0; j--) {
|
|
var c = digits[j];
|
|
max = Math.max(max, counts[c] = (counts[c] || 0) + 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check randomness for v4 UUIDs
|
|
if (version == 'v4') {
|
|
// Limit that we get worried about randomness. (Purely empirical choice, this!)
|
|
var limit = 2*100*Math.sqrt(1/N);
|
|
|
|
log('\nChecking v4 randomness. Distribution of Hex Digits (% deviation from ideal)');
|
|
|
|
for (var i = 0; i < 16; i++) {
|
|
var c = i.toString(16);
|
|
var bar = '', n = counts[c], p = Math.round(n/max*100|0);
|
|
|
|
// 1-3,5-8, and D-F: 1:16 odds over 30 digits
|
|
var ideal = N*30/16;
|
|
if (i == 4) {
|
|
// 4: 1:1 odds on 1 digit, plus 1:16 odds on 30 digits
|
|
ideal = N*(1 + 30/16);
|
|
} else if (i >= 8 && i <= 11) {
|
|
// 8-B: 1:4 odds on 1 digit, plus 1:16 odds on 30 digits
|
|
ideal = N*(1/4 + 30/16);
|
|
} else {
|
|
// Otherwise: 1:16 odds on 30 digits
|
|
ideal = N*30/16;
|
|
}
|
|
var d = divergence(n, ideal);
|
|
|
|
// Draw bar using UTF squares (just for grins)
|
|
var s = n/max*50 | 0;
|
|
while (s--) bar += '=';
|
|
|
|
assert(Math.abs(d) < limit, c + ' |' + bar + '| ' + counts[c] + ' (' + d + '% < ' + limit + '%)');
|
|
}
|
|
}
|
|
}
|
|
|
|
// Perf tests
|
|
for (var version in generators) {
|
|
log('\nPerformance testing ' + version + ' UUIDs');
|
|
var generator = generators[version];
|
|
var buf = new uuid.BufferClass(16);
|
|
|
|
for (var i = 0, t = Date.now(); i < N; i++) generator();
|
|
rate('uuid.' + version + '()', t);
|
|
|
|
for (var i = 0, t = Date.now(); i < N; i++) generator('binary');
|
|
rate('uuid.' + version + '(\'binary\')', t);
|
|
|
|
for (var i = 0, t = Date.now(); i < N; i++) generator('binary', buf);
|
|
rate('uuid.' + version + '(\'binary\', buffer)', t);
|
|
}
|