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// Copyright 2016-Present Couchbase, Inc.
//
// Use of this software is governed by the Business Source License included
// in the file licenses/BSL-Couchbase.txt. As of the Change Date specified
// in that file, in accordance with the Business Source License, use of this
// software will be governed by the Apache License, Version 2.0, included in
// the file licenses/APL2.txt.
package moss
import (
"fmt"
"io/ioutil"
"os"
"sync"
"testing"
"time"
)
func TestIteratorMergeOps(t *testing.T) {
var mlock sync.Mutex
events := map[EventKind]int{}
mo := &MergeOperatorStringAppend{Sep: ":"}
m, err := NewCollection(CollectionOptions{
MergeOperator: mo,
OnEvent: func(e Event) {
mlock.Lock()
events[e.Kind]++
mlock.Unlock()
},
})
if err != nil || m == nil {
t.Errorf("expected moss")
}
mc := m.(*collection)
err = m.Start()
if err != nil {
t.Errorf("expected Start ok")
}
mergeVal := func(v string) {
b, err := m.NewBatch(0, 0)
if err != nil || b == nil {
t.Errorf("expected b ok")
}
b.Merge([]byte("a"), []byte(v))
err = m.ExecuteBatch(b, WriteOptions{})
if err != nil {
t.Errorf("expected execute batch ok")
}
}
mergeVal("A")
mergeVal("B")
mc.NotifyMerger("mergeAll", true)
checkVal := func(expected string) {
ss, err := m.Snapshot()
if err != nil {
t.Errorf("expected ss ok")
}
iter, err := ss.StartIterator(nil, nil, IteratorOptions{})
if err != nil || iter == nil {
t.Errorf("expected iter")
}
k, v, err := iter.Current()
if err != nil {
t.Errorf("expected current")
}
if string(k) != "a" {
t.Errorf("expected current key a")
}
if string(v) != expected {
t.Errorf("expected current val expected: %v, got: %v", expected, v)
}
if iter.Next() != ErrIteratorDone {
t.Errorf("expected only 1 value in iterator")
}
v, err = ss.Get([]byte("a"), ReadOptions{})
if err != nil || string(v) != expected {
t.Errorf("expected %s, got: %s, err: %v", expected, v, err)
}
}
checkVal(":A:B")
mc.NotifyMerger("mergeAll", true)
checkVal(":A:B")
// -----------------------------------
mergeVal("C")
mc.NotifyMerger("mergeAll", true)
checkVal(":A:B:C")
mo.m.Lock()
if mo.numFull+mo.numPartial <= 0 {
t.Errorf("expected some merges")
}
mlock.Lock()
if len(events) <= 0 {
t.Errorf("expected some events")
}
mlock.Unlock()
mo.m.Unlock()
}
func TestIteratorMergeOps_MB19667(t *testing.T) {
// Need to arrange that...
// - stack dirty top = empty
// - stack dirty mid = [ various merge ops ]
// - stack dirty base = [ more merge ops ]
//
var mlock sync.Mutex
events := map[EventKind]int{}
var eventCh chan EventKind
mo := &MergeOperatorStringAppend{Sep: ":"}
m, err := NewCollection(CollectionOptions{
MergeOperator: mo,
OnEvent: func(e Event) {
mlock.Lock()
events[e.Kind]++
if eventCh != nil {
eventCh <- e.Kind
}
mlock.Unlock()
},
})
if err != nil || m == nil {
t.Errorf("expected moss")
}
mc := m.(*collection)
// Note that we haven't Start()'ed the collection yet, so it
// doesn't have any background goroutines runnning yet.
mergeVal := func(v string) {
b, err := m.NewBatch(0, 0)
if err != nil || b == nil {
t.Errorf("expected b ok")
}
b.Merge([]byte("k"), []byte(v))
err = m.ExecuteBatch(b, WriteOptions{})
if err != nil {
t.Errorf("expected execute batch ok")
}
b.Close()
}
mergeVal("A")
mergeVal("B")
// Pretend to be the merger, moving stack dirty top into base.
mc.m.Lock()
mc.stackDirtyBase = mc.stackDirtyTop
mc.stackDirtyTop = nil
mc.m.Unlock()
mergeVal("C")
mergeVal("D")
// Pretend to be the merger, moving stack dirty top into mid.
mc.m.Lock()
mc.stackDirtyMid = mc.stackDirtyTop
mc.stackDirtyTop = nil
mc.m.Unlock()
checkVal := func(expected string) {
ss, err := m.Snapshot()
if err != nil {
t.Errorf("expected ss ok")
}
getv, err := ss.Get([]byte("k"), ReadOptions{})
if err != nil || string(getv) != expected {
t.Errorf("expected %s, got: %s, err: %v", expected, getv, err)
}
iter, err := ss.StartIterator(nil, nil, IteratorOptions{})
if err != nil || iter == nil {
t.Errorf("expected iter")
}
k, v, err := iter.Current()
if err != nil {
t.Errorf("expected iter current no err")
}
if string(k) != "k" {
t.Errorf("expected iter current key k")
}
if string(v) != expected {
t.Errorf("expected iter current val expected: %v, got: %s", expected, v)
}
if iter.Next() != ErrIteratorDone {
t.Errorf("expected only 1 value in iterator")
}
ss.Close()
}
checkVal(":A:B:C:D")
// Now, start the merger goroutine and force it to run once.
mc.Start()
mc.NotifyMerger("mergeAll", true)
// After the merging, the value should be correct. Before the fix
// to MB-19667, it used to ignore the information in the
// stackDirtyBase and incorrectly return only the latest mergings
// of ":C:D".
checkVal(":A:B:C:D")
}
func TestIteratorSingleMergeOp(t *testing.T) {
testIteratorSingleMergeOp(t, []string{"A"}, ":A")
}
func TestIteratorSingleMergeOp2(t *testing.T) {
testIteratorSingleMergeOp(t, []string{"A", "B"}, ":A:B")
}
func testIteratorSingleMergeOp(t *testing.T,
mergeVals []string, expectVal string) {
var mlock sync.Mutex
events := map[EventKind]int{}
mo := &MergeOperatorStringAppend{Sep: ":"}
m, err := NewCollection(CollectionOptions{
MergeOperator: mo,
OnEvent: func(e Event) {
mlock.Lock()
events[e.Kind]++
mlock.Unlock()
},
})
if err != nil || m == nil {
t.Errorf("expected moss")
}
mc := m.(*collection)
err = m.Start()
if err != nil {
t.Errorf("expected Start ok")
}
mergeVal := func(v string) {
b, err := m.NewBatch(0, 0)
if err != nil || b == nil {
t.Errorf("expected b ok")
}
b.Merge([]byte("a"), []byte(v))
err = m.ExecuteBatch(b, WriteOptions{})
if err != nil {
t.Errorf("expected execute batch ok")
}
}
for _, mv := range mergeVals {
mergeVal(mv)
}
mc.NotifyMerger("mergeAll", true)
checkVal := func(expected string) {
ss, err := m.Snapshot()
if err != nil {
t.Errorf("expected ss ok")
}
iter, err := ss.StartIterator(nil, nil, IteratorOptions{})
if err != nil || iter == nil {
t.Errorf("expected iter")
}
_, ok := iter.(*iteratorSingle)
if !ok {
t.Errorf("expected iteratorSingle")
}
k, v, err := iter.Current()
if err != nil {
t.Errorf("expected current")
}
if string(k) != "a" {
t.Errorf("expected current key a")
}
if string(v) != expected {
t.Errorf("expected current val expected: %v, got: %v", expected, v)
}
if iter.Next() != ErrIteratorDone {
t.Errorf("expected only 1 value in iterator")
}
v, err = ss.Get([]byte("a"), ReadOptions{})
if err != nil || string(v) != expected {
t.Errorf("expected %s, got: %s, err: %v", expected, v, err)
}
}
checkVal(expectVal)
}
func TestIteratorSeekTo(t *testing.T) {
testIteratorSeekTo(t, true, true, nil, nil)
testIteratorSeekTo(t, true, true, []byte("1"), nil)
testIteratorSeekTo(t, true, true, []byte("1"), []byte("900"))
testIteratorSeekTo(t, true, true, nil, []byte("900"))
testIteratorSeekTo(t, true, false, nil, nil)
testIteratorSeekTo(t, true, false, []byte("1"), nil)
testIteratorSeekTo(t, true, false, []byte("1"), []byte("900"))
testIteratorSeekTo(t, true, false, nil, []byte("900"))
testIteratorSeekTo(t, false, true, nil, nil)
testIteratorSeekTo(t, false, true, []byte("1"), nil)
testIteratorSeekTo(t, false, true, []byte("1"), []byte("900"))
testIteratorSeekTo(t, false, true, nil, []byte("900"))
testIteratorSeekTo(t, false, false, nil, nil)
testIteratorSeekTo(t, false, false, []byte("1"), nil)
testIteratorSeekTo(t, false, false, []byte("1"), []byte("900"))
testIteratorSeekTo(t, false, false, nil, []byte("900"))
}
func testIteratorSeekTo(t *testing.T, startEarly, oneBatch bool,
startKey, endKey []byte) {
m, _ := NewCollection(CollectionOptions{})
if startEarly {
m.Start()
}
if oneBatch {
// Insert 1, 3, 5, 7, 9
batch, _ := m.NewBatch(0, 0)
for i := 1; i <= 9; i += 2 {
x := []byte(fmt.Sprintf("%d", i))
batch.Set(x, x)
}
m.ExecuteBatch(batch, WriteOptions{})
batch.Close()
} else {
// Insert 1, 3, 5
batch, _ := m.NewBatch(0, 0)
for i := 1; i <= 5; i += 2 {
x := []byte(fmt.Sprintf("%d", i))
batch.Set(x, x)
}
m.ExecuteBatch(batch, WriteOptions{})
batch.Close()
// Insert 7, 9
batch, _ = m.NewBatch(0, 0)
for i := 7; i <= 9; i += 2 {
x := []byte(fmt.Sprintf("%d", i))
batch.Set(x, x)
}
m.ExecuteBatch(batch, WriteOptions{})
batch.Close()
}
ss, err := m.Snapshot()
if err != nil {
t.Errorf("expected no snapshot err, got: %v", err)
}
itr, err := ss.StartIterator(nil, nil, IteratorOptions{})
if err != nil {
t.Errorf("expected no itr err, got: %v", err)
}
err = itr.SeekTo([]byte("0"))
if err == ErrIteratorDone {
t.Errorf("expected done, got: %v", err)
}
gotk, _, err := itr.Current()
if err != nil {
t.Errorf("expected no Current err, got: %v", err)
}
expectedk := "1"
if expectedk != string(gotk) {
t.Errorf("expected: %s, gotk: %s", expectedk, string(gotk))
}
for i := 0; i < 2; i++ {
err = itr.SeekTo([]byte("1"))
if err == ErrIteratorDone {
t.Errorf("expected done, got: %v", err)
}
gotk, _, err = itr.Current()
if err != nil {
t.Errorf("expected no Current err, got: %v", err)
}
expectedk := "1"
if expectedk != string(gotk) {
t.Errorf("expected: %s, gotk: %s", expectedk, string(gotk))
}
}
for i := 1; i < 10; i++ {
k := []byte(fmt.Sprintf("%d", i))
err = itr.SeekTo(k)
if err != nil {
t.Errorf("expected no SeekTo err, got: %v", err)
}
gotk, _, err = itr.Current()
if err != nil {
t.Errorf("expected no Current err, got: %v", err)
}
expected := i
if i%2 == 0 {
expected = i + 1
}
expectedk := fmt.Sprintf("%d", expected)
if expectedk != string(gotk) {
t.Errorf("i: %d, expected: %s, gotk: %s", i, expectedk, string(gotk))
}
}
err = itr.SeekTo([]byte("999"))
if err != ErrIteratorDone {
t.Errorf("expected done, got: %v", err)
}
err = itr.SeekTo([]byte("999"))
if err != ErrIteratorDone {
t.Errorf("expected done, got: %v", err)
}
if !startEarly {
m.Start()
}
itr.Close()
ss.Close()
m.Close()
}
func TestSharedPrefixLen(t *testing.T) {
if sharedPrefixLen(nil, []byte("hi")) != 0 {
t.Errorf("not matched")
}
if sharedPrefixLen([]byte("hi"), nil) != 0 {
t.Errorf("not matched")
}
if sharedPrefixLen(nil, nil) != 0 {
t.Errorf("not matched")
}
tests := []struct {
a, b string
exp int
}{
{"x", "", 0},
{"", "x", 0},
{"x", "x", 1},
{"x", "xy", 1},
{"xy", "x", 1},
{"x", "xx", 1},
{"xx", "x", 1},
{"xx", "xx", 2},
{"xx", "xxy", 2},
{"xxy", "xx", 2},
}
for _, test := range tests {
if sharedPrefixLen([]byte(test.a), []byte(test.b)) != test.exp {
t.Errorf("didn't match on test: %#v", test)
}
}
}
func TestIteratorSingleDone(t *testing.T) {
tmpDir, _ := ioutil.TempDir("", "mossStore")
defer os.RemoveAll(tmpDir)
store, m, err := OpenStoreCollection(tmpDir,
StoreOptions{}, StorePersistOptions{CompactionConcern: CompactionForce})
if err != nil || m == nil || store == nil {
t.Errorf("expected open empty store collection to work")
}
defer m.Close()
defer store.Close()
mc := m.(*collection)
setVal := func(s string) {
b, err2 := m.NewBatch(0, 0)
if err2 != nil || b == nil {
t.Errorf("expected b ok")
}
b.Set([]byte(s), []byte(s))
err2 = m.ExecuteBatch(b, WriteOptions{})
if err2 != nil {
t.Errorf("expected execute batch ok")
}
}
for _, mv := range []string{"a", "b"} {
setVal(mv)
}
mc.NotifyMerger("mergeAll", true)
waitUntilClean := func() error {
for {
stats, err2 := m.Stats()
if err2 != nil {
return err2
}
if stats.CurDirtyOps <= 0 &&
stats.CurDirtyBytes <= 0 &&
stats.CurDirtySegments <= 0 {
break
}
time.Sleep(200 * time.Millisecond)
}
return nil
}
waitUntilClean()
ss, err := m.Snapshot()
if err != nil {
t.Errorf("expected ss ok")
}
iter, err := ss.StartIterator([]byte("b"), nil, IteratorOptions{})
if err != nil || iter == nil {
t.Errorf("expected iter")
}
_, ok := iter.(*iteratorSingle)
if !ok {
t.Errorf("expected iteratorSingle")
}
k, v, err := iter.Current()
if err != nil {
t.Errorf("expected nil err")
}
if string(k) != "b" {
t.Errorf("expected b key")
}
if string(v) != "b" {
t.Errorf("expected b val")
}
err = iter.Next()
if err != ErrIteratorDone {
t.Errorf("expected Next() ErrIteratorDone, got: %v", err)
}
for i := 0; i < 10; i++ {
k, v, err := iter.Current()
if err != ErrIteratorDone {
t.Errorf("loop - expected Current() ErrIteratorDone, got: %v", err)
}
if k != nil {
t.Errorf("loop - expected nil key, got: %v", k)
}
if v != nil {
t.Errorf("loop - expected nil val, got: %v", v)
}
err = iter.Next()
if err != ErrIteratorDone {
t.Errorf("loop - expected Next() ErrIteratorDone, got: %v", err)
}
}
}