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255 lines
7.2 KiB
Go
255 lines
7.2 KiB
Go
// Copyright (c) 2018 Shivaram Lingamneni <slingamn@cs.stanford.edu>
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// released under the MIT license
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package history
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import (
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"reflect"
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"strconv"
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"testing"
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"time"
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)
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const (
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timeFormat = "2006-01-02 15:04:05Z"
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)
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func TestEmptyBuffer(t *testing.T) {
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pastTime := easyParse(timeFormat)
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buf := NewHistoryBuffer(0, 0)
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if buf.Enabled() {
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t.Error("the buffer of size 0 must be considered disabled")
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}
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buf.Add(Item{
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Nick: "testnick",
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})
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since, complete := buf.Between(pastTime, time.Now(), false, 0)
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if len(since) != 0 {
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t.Error("shouldn't be able to add to disabled buf")
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}
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if complete {
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t.Error("the empty/disabled buffer should report results as incomplete")
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}
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buf.Resize(1, 0)
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if !buf.Enabled() {
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t.Error("the buffer of size 1 must be considered enabled")
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}
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since, complete = buf.Between(pastTime, time.Now(), false, 0)
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assertEqual(complete, true, t)
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assertEqual(len(since), 0, t)
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buf.Add(Item{
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Nick: "testnick",
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})
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since, complete = buf.Between(pastTime, time.Now(), false, 0)
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if len(since) != 1 {
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t.Error("should be able to store items in a nonempty buffer")
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}
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if !complete {
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t.Error("results should be complete")
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}
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if since[0].Nick != "testnick" {
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t.Error("retrived junk data")
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}
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buf.Add(Item{
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Nick: "testnick2",
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})
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since, complete = buf.Between(pastTime, time.Now(), false, 0)
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if len(since) != 1 {
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t.Error("expect exactly 1 item")
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}
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if complete {
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t.Error("results must be marked incomplete")
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}
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if since[0].Nick != "testnick2" {
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t.Error("retrieved junk data")
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}
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matchAll := func(item Item) bool { return true }
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assertEqual(toNicks(buf.Match(matchAll, false, 0)), []string{"testnick2"}, t)
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}
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func toNicks(items []Item) (result []string) {
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result = make([]string, len(items))
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for i, item := range items {
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result[i] = item.Nick
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}
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return
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}
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func easyParse(timestamp string) time.Time {
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result, err := time.Parse(timeFormat, timestamp)
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if err != nil {
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panic(err)
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}
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return result
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}
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func easyItem(nick string, timestamp string) (result Item) {
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result.Message.Time = easyParse(timestamp)
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result.Nick = nick
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return
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}
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func assertEqual(supplied, expected interface{}, t *testing.T) {
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if !reflect.DeepEqual(supplied, expected) {
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t.Errorf("expected %v but got %v", expected, supplied)
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}
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}
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func TestBuffer(t *testing.T) {
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start := easyParse("2006-01-01 00:00:00Z")
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buf := NewHistoryBuffer(3, 0)
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buf.Add(easyItem("testnick0", "2006-01-01 15:04:05Z"))
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buf.Add(easyItem("testnick1", "2006-01-02 15:04:05Z"))
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buf.Add(easyItem("testnick2", "2006-01-03 15:04:05Z"))
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since, complete := buf.Between(start, time.Now(), false, 0)
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assertEqual(complete, true, t)
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assertEqual(toNicks(since), []string{"testnick0", "testnick1", "testnick2"}, t)
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// add another item, evicting the first
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buf.Add(easyItem("testnick3", "2006-01-04 15:04:05Z"))
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since, complete = buf.Between(start, time.Now(), false, 0)
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assertEqual(complete, false, t)
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assertEqual(toNicks(since), []string{"testnick1", "testnick2", "testnick3"}, t)
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// now exclude the time of the discarded entry; results should be complete again
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since, complete = buf.Between(easyParse("2006-01-02 00:00:00Z"), time.Now(), false, 0)
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assertEqual(complete, true, t)
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assertEqual(toNicks(since), []string{"testnick1", "testnick2", "testnick3"}, t)
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since, complete = buf.Between(easyParse("2006-01-02 00:00:00Z"), easyParse("2006-01-03 00:00:00Z"), false, 0)
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assertEqual(complete, true, t)
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assertEqual(toNicks(since), []string{"testnick1"}, t)
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// shrink the buffer, cutting off testnick1
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buf.Resize(2, 0)
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since, complete = buf.Between(easyParse("2006-01-02 00:00:00Z"), time.Now(), false, 0)
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assertEqual(complete, false, t)
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assertEqual(toNicks(since), []string{"testnick2", "testnick3"}, t)
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buf.Resize(5, 0)
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buf.Add(easyItem("testnick4", "2006-01-05 15:04:05Z"))
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buf.Add(easyItem("testnick5", "2006-01-06 15:04:05Z"))
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buf.Add(easyItem("testnick6", "2006-01-07 15:04:05Z"))
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since, complete = buf.Between(easyParse("2006-01-03 00:00:00Z"), time.Now(), false, 0)
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assertEqual(complete, true, t)
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assertEqual(toNicks(since), []string{"testnick2", "testnick3", "testnick4", "testnick5", "testnick6"}, t)
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// test ascending order
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since, _ = buf.Between(easyParse("2006-01-03 00:00:00Z"), time.Now(), true, 2)
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assertEqual(toNicks(since), []string{"testnick2", "testnick3"}, t)
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}
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func autoItem(id int, t time.Time) (result Item) {
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result.Message.Time = t
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result.Nick = strconv.Itoa(id)
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return
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}
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func atoi(s string) int {
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result, err := strconv.Atoi(s)
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if err != nil {
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panic(err)
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}
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return result
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}
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func TestAutoresize(t *testing.T) {
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now := easyParse("2006-01-01 00:00:00Z")
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nowFunc := func() time.Time {
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return now
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}
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buf := NewHistoryBuffer(128, time.Hour)
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buf.nowFunc = nowFunc
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// add items slowly (one every 10 minutes): the buffer should not expand
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// beyond initialAutoSize
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id := 0
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for i := 0; i < 72; i += 1 {
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buf.Add(autoItem(id, now))
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if initialAutoSize < buf.length() {
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t.Errorf("buffer incorrectly resized above %d to %d", initialAutoSize, buf.length())
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}
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now = now.Add(time.Minute * 10)
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id += 1
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}
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items := buf.Latest(0)
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assertEqual(len(items), initialAutoSize, t)
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assertEqual(atoi(items[0].Nick), 40, t)
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assertEqual(atoi(items[len(items)-1].Nick), 71, t)
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// dump 100 items in very fast:
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for i := 0; i < 100; i += 1 {
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buf.Add(autoItem(id, now))
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now = now.Add(time.Second)
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id += 1
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}
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// ok, 5 items from the first batch are still in the 1-hour window;
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// we should overwrite until only those 5 are left, then start expanding
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// the buffer so that it retains those 5 and the 100 new items
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items = buf.Latest(0)
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assertEqual(len(items), 105, t)
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assertEqual(atoi(items[0].Nick), 67, t)
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assertEqual(atoi(items[len(items)-1].Nick), 171, t)
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// another 100 items very fast:
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for i := 0; i < 100; i += 1 {
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buf.Add(autoItem(id, now))
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now = now.Add(time.Second)
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id += 1
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}
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// should fill up to the maximum size of 128 and start overwriting
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items = buf.Latest(0)
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assertEqual(len(items), 128, t)
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assertEqual(atoi(items[0].Nick), 144, t)
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assertEqual(atoi(items[len(items)-1].Nick), 271, t)
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}
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// regression test for #702
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func TestEnabledByResize(t *testing.T) {
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now := easyParse("2006-01-01 00:00:00Z")
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// empty/disabled autoresizing buffer
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buf := NewHistoryBuffer(0, time.Hour)
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// enable the buffer as during a rehash
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buf.Resize(128, time.Hour)
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// add an item and test that it is stored and retrievable
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buf.Add(autoItem(0, now))
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items := buf.Latest(0)
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assertEqual(len(items), 1, t)
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assertEqual(atoi(items[0].Nick), 0, t)
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}
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func TestDisabledByResize(t *testing.T) {
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now := easyParse("2006-01-01 00:00:00Z")
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// enabled autoresizing buffer
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buf := NewHistoryBuffer(128, time.Hour)
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buf.Add(autoItem(0, now))
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items := buf.Latest(0)
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assertEqual(len(items), 1, t)
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assertEqual(atoi(items[0].Nick), 0, t)
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// disable as during a rehash, confirm that nothing can be retrieved
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buf.Resize(0, time.Hour)
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items = buf.Latest(0)
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assertEqual(len(items), 0, t)
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}
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func TestRoundUp(t *testing.T) {
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assertEqual(roundUpToPowerOfTwo(2), 2, t)
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assertEqual(roundUpToPowerOfTwo(3), 4, t)
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assertEqual(roundUpToPowerOfTwo(64), 64, t)
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assertEqual(roundUpToPowerOfTwo(65), 128, t)
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assertEqual(roundUpToPowerOfTwo(100), 128, t)
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assertEqual(roundUpToPowerOfTwo(1000), 1024, t)
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assertEqual(roundUpToPowerOfTwo(1025), 2048, t)
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assertEqual(roundUpToPowerOfTwo(269435457), 536870912, t)
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}
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