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iterator.go
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iterator.go
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package test
import (
"bytes"
"reflect"
"strings"
"testing"
"github.com/blevesearch/bleve/index/store"
)
// tests around the correct behavior of iterators
type testRow struct {
key []byte
val []byte
}
func batchWriteRows(s store.KVStore, rows []testRow) error {
// open a writer
writer, err := s.Writer()
if err != nil {
return err
}
// write the data
batch := writer.NewBatch()
for _, row := range rows {
batch.Set(row.key, row.val)
}
err = writer.ExecuteBatch(batch)
if err != nil {
return err
}
// close the writer
err = writer.Close()
if err != nil {
return err
}
return nil
}
func CommonTestPrefixIterator(t *testing.T, s store.KVStore) {
data := []testRow{
{[]byte("apple"), []byte("val")},
{[]byte("cat1"), []byte("val")},
{[]byte("cat2"), []byte("val")},
{[]byte("cat3"), []byte("val")},
{[]byte("dog1"), []byte("val")},
{[]byte("dog2"), []byte("val")},
{[]byte("dog4"), []byte("val")},
{[]byte("elephant"), []byte("val")},
}
expectedCats := [][]byte{
[]byte("cat1"),
[]byte("cat2"),
[]byte("cat3"),
}
expectedDogs := [][]byte{
[]byte("dog1"),
// we seek to "dog3" and ensure it skips over "dog2"
// but still finds "dog4" even though there was no "dog3"
[]byte("dog4"),
}
err := batchWriteRows(s, data)
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err := s.Reader()
if err != nil {
t.Fatal(err)
}
// get a prefix reader
cats := make([][]byte, 0)
iter := reader.PrefixIterator([]byte("cat"))
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
cats = append(cats, copyk)
iter.Next()
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
// check that we found all the cats
if !reflect.DeepEqual(cats, expectedCats) {
t.Fatalf("expected cats %v, got %v", expectedCats, cats)
}
// get a prefix reader
dogs := make([][]byte, 0)
iter = reader.PrefixIterator([]byte("dog"))
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
dogs = append(dogs, copyk)
if len(dogs) < 2 {
iter.Seek([]byte("dog3"))
} else {
iter.Next()
}
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
// check that we found the expected dogs
if !reflect.DeepEqual(dogs, expectedDogs) {
t.Fatalf("expected dogs %v, got %v", expectedDogs, dogs)
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
}
func CommonTestPrefixIteratorSeek(t *testing.T, s store.KVStore) {
data := []testRow{
{[]byte("a"), []byte("val")},
{[]byte("b1"), []byte("val")},
{[]byte("b2"), []byte("val")},
{[]byte("b3"), []byte("val")},
{[]byte("c"), []byte("val")},
}
err := batchWriteRows(s, data)
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err := s.Reader()
if err != nil {
t.Fatal(err)
}
defer func() {
err := reader.Close()
if err != nil {
t.Fatal(err)
}
}()
// get an iterator on a central subset of the data
iter := reader.PrefixIterator([]byte("b"))
defer func() {
err := iter.Close()
if err != nil {
t.Fatal(err)
}
}()
// check that all keys have prefix
found := []string{}
for ; iter.Valid(); iter.Next() {
found = append(found, string(iter.Key()))
}
for _, f := range found {
if !strings.HasPrefix(f, "b") {
t.Errorf("got key '%s' that doesn't have correct prefix", f)
}
}
if len(found) != 3 {
t.Errorf("expected 3 keys with prefix, got %d", len(found))
}
// now try to seek before the prefix and repeat
found = []string{}
for iter.Seek([]byte("a")); iter.Valid(); iter.Next() {
found = append(found, string(iter.Key()))
}
for _, f := range found {
if !strings.HasPrefix(f, "b") {
t.Errorf("got key '%s' that doesn't have correct prefix", f)
}
}
if len(found) != 3 {
t.Errorf("expected 3 keys with prefix, got %d", len(found))
}
// now try to seek after the prefix and repeat
found = []string{}
for iter.Seek([]byte("c")); iter.Valid(); iter.Next() {
found = append(found, string(iter.Key()))
}
for _, f := range found {
if !strings.HasPrefix(f, "b") {
t.Errorf("got key '%s' that doesn't have correct prefix", f)
}
}
if len(found) != 0 {
t.Errorf("expected 0 keys with prefix, got %d", len(found))
}
}
func CommonTestRangeIterator(t *testing.T, s store.KVStore) {
data := []testRow{
{[]byte("a1"), []byte("val")},
{[]byte("b1"), []byte("val")},
{[]byte("b2"), []byte("val")},
{[]byte("b3"), []byte("val")},
{[]byte("c1"), []byte("val")},
{[]byte("c2"), []byte("val")},
{[]byte("c4"), []byte("val")},
{[]byte("d1"), []byte("val")},
}
expectedAll := make([][]byte, 0)
expectedBToC := make([][]byte, 0)
expectedCToDSeek3 := make([][]byte, 0)
expectedCToEnd := make([][]byte, 0)
for _, row := range data {
expectedAll = append(expectedAll, row.key)
if bytes.HasPrefix(row.key, []byte("b")) {
expectedBToC = append(expectedBToC, row.key)
}
if bytes.HasPrefix(row.key, []byte("c")) && !bytes.HasSuffix(row.key, []byte("2")) {
expectedCToDSeek3 = append(expectedCToDSeek3, row.key)
}
if bytes.Compare(row.key, []byte("c")) > 0 {
expectedCToEnd = append(expectedCToEnd, row.key)
}
}
err := batchWriteRows(s, data)
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err := s.Reader()
if err != nil {
t.Fatal(err)
}
// get a range iterator (all)
all := make([][]byte, 0)
iter := reader.RangeIterator(nil, nil)
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
all = append(all, copyk)
iter.Next()
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
// check that we found all
if !reflect.DeepEqual(all, expectedAll) {
t.Fatalf("expected all %v, got %v", expectedAll, all)
}
// get range iterator from b - c
bToC := make([][]byte, 0)
iter = reader.RangeIterator([]byte("b"), []byte("c"))
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
bToC = append(bToC, copyk)
iter.Next()
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
// check that we found b-c
if !reflect.DeepEqual(bToC, expectedBToC) {
t.Fatalf("expected b-c %v, got %v", expectedBToC, bToC)
}
// get range iterator from c - d, but seek to 'c3'
cToDSeek3 := make([][]byte, 0)
iter = reader.RangeIterator([]byte("c"), []byte("d"))
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
cToDSeek3 = append(cToDSeek3, copyk)
if len(cToDSeek3) < 2 {
iter.Seek([]byte("c3"))
} else {
iter.Next()
}
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
// check that we found c-d with seek to c3
if !reflect.DeepEqual(cToDSeek3, expectedCToDSeek3) {
t.Fatalf("expected b-c %v, got %v", expectedCToDSeek3, cToDSeek3)
}
// get range iterator from c to the end
cToEnd := make([][]byte, 0)
iter = reader.RangeIterator([]byte("c"), nil)
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
cToEnd = append(cToEnd, copyk)
iter.Next()
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
// check that we found c to end
if !reflect.DeepEqual(cToEnd, expectedCToEnd) {
t.Fatalf("expected b-c %v, got %v", expectedCToEnd, cToEnd)
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
}
func CommonTestRangeIteratorSeek(t *testing.T, s store.KVStore) {
data := []testRow{
{[]byte("a1"), []byte("val")},
{[]byte("b1"), []byte("val")},
{[]byte("c1"), []byte("val")},
{[]byte("d1"), []byte("val")},
{[]byte("e1"), []byte("val")},
}
err := batchWriteRows(s, data)
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err := s.Reader()
if err != nil {
t.Fatal(err)
}
// get an iterator on a central subset of the data
start := []byte("b1")
end := []byte("d1")
iter := reader.RangeIterator(start, end)
// seek before, at and after every possible key
targets := [][]byte{}
for _, row := range data {
prefix := string(row.key[:1])
targets = append(targets, []byte(prefix+"0"))
targets = append(targets, []byte(prefix+"1"))
targets = append(targets, []byte(prefix+"2"))
}
for _, target := range targets {
found := []string{}
for iter.Seek(target); iter.Valid(); iter.Next() {
found = append(found, string(iter.Key()))
if len(found) > len(data) {
t.Fatalf("enumerated more than data keys after seeking to %s",
string(target))
}
}
wanted := []string{}
for _, row := range data {
if bytes.Compare(row.key, start) < 0 ||
bytes.Compare(row.key, target) < 0 ||
bytes.Compare(row.key, end) >= 0 {
continue
}
wanted = append(wanted, string(row.key))
}
fs := strings.Join(found, ", ")
ws := strings.Join(wanted, ", ")
if fs != ws {
t.Fatalf("iterating from %s returned [%s] instead of [%s]",
string(target), fs, ws)
}
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
if err != nil {
t.Fatal(err)
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
}