mirror of https://github.com/ledisdb/ledisdb.git
support sort command
This commit is contained in:
siddontang
parent
adbfd4b945
commit
b5c78640aa
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@ -0,0 +1,232 @@
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package ledis
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import (
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"bytes"
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"fmt"
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"github.com/siddontang/ledisdb/store"
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"sort"
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"strconv"
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)
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type Limit struct {
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Offset int
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Size int
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}
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func getSortRange(values [][]byte, offset int, size int) (int, int) {
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var start = 0
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if offset > 0 {
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start = offset
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}
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valueLen := len(values)
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var end = valueLen - 1
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if size > 0 {
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end = start + size - 1
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}
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if start >= valueLen {
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start = valueLen - 1
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end = valueLen - 2
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}
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if end >= valueLen {
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end = valueLen - 1
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}
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return start, end
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}
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var hashPattern = []byte("*->")
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func (db *DB) lookupKeyByPattern(pattern []byte, subKey []byte) []byte {
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// If the pattern is #, return the substitution key itself
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if bytes.Equal(pattern, []byte{'#'}) {
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return subKey
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}
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// If we can't find '*' in the pattern, return nil
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if !bytes.Contains(pattern, []byte{'*'}) {
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return nil
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}
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key := pattern
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var field []byte = nil
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// Find out if we're dealing with a hash dereference
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if n := bytes.Index(pattern, hashPattern); n > 0 && n+3 < len(pattern) {
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key = pattern[0 : n+1]
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field = pattern[n+3:]
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}
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// Perform the '*' substitution
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key = bytes.Replace(key, []byte{'*'}, subKey, 1)
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var value []byte
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if field == nil {
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value, _ = db.Get(key)
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} else {
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value, _ = db.HGet(key, field)
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}
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return value
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}
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type sortItem struct {
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value []byte
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cmpValue []byte
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score float64
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}
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type sortItemSlice struct {
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alpha bool
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sortByPattern bool
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items []sortItem
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}
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func (s *sortItemSlice) Len() int {
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return len(s.items)
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}
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func (s *sortItemSlice) Swap(i, j int) {
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s.items[i], s.items[j] = s.items[j], s.items[i]
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}
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func (s *sortItemSlice) Less(i, j int) bool {
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s1 := s.items[i]
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s2 := s.items[j]
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if !s.alpha {
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if s1.score < s2.score {
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return true
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} else if s1.score > s2.score {
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return false
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} else {
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return bytes.Compare(s1.value, s2.value) < 0
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}
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} else {
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if s.sortByPattern {
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if s1.cmpValue == nil || s2.cmpValue == nil {
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if s1.cmpValue == nil {
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return true
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} else {
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return false
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}
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} else {
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// Unlike redis, we only use bytes compare
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return bytes.Compare(s1.cmpValue, s2.cmpValue) < 0
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}
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} else {
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// Unlike redis, we only use bytes compare
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return bytes.Compare(s1.value, s2.value) < 0
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}
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}
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}
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func (db *DB) xsort(values [][]byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error) {
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if len(values) == 0 {
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return [][]byte{}, nil
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}
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start, end := getSortRange(values, offset, size)
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dontsort := 0
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if sortBy != nil {
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if !bytes.Contains(sortBy, []byte{'*'}) {
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dontsort = 1
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}
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}
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items := &sortItemSlice{
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alpha: alpha,
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sortByPattern: sortBy != nil,
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items: make([]sortItem, len(values)),
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}
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for i, value := range values {
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items.items[i].value = value
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items.items[i].score = 0
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items.items[i].cmpValue = nil
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if dontsort == 0 {
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var cmpValue []byte
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if sortBy != nil {
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cmpValue = db.lookupKeyByPattern(sortBy, value)
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} else {
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// use value iteself to sort by
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cmpValue = value
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}
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if cmpValue == nil {
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continue
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}
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if alpha {
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if sortBy != nil {
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items.items[i].cmpValue = cmpValue
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}
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} else {
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score, err := strconv.ParseFloat(string(cmpValue), 64)
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if err != nil {
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return nil, fmt.Errorf("%s scores can't be converted into double", cmpValue)
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}
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items.items[i].score = score
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}
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}
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}
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if dontsort == 0 {
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if !desc {
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sort.Sort(items)
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} else {
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sort.Sort(sort.Reverse(items))
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}
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}
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var resLen int = end - start + 1
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if len(sortGet) > 0 {
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resLen = len(sortGet) * (end - start + 1)
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}
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res := make([][]byte, 0, resLen)
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for i := start; i <= end; i++ {
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if len(sortGet) == 0 {
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res = append(res, items.items[i].value)
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} else {
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for _, getPattern := range sortGet {
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v := db.lookupKeyByPattern(getPattern, items.items[i].value)
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res = append(res, v)
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}
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}
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}
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return res, nil
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}
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func (db *DB) XLSort(key []byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error) {
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values, err := db.LRange(key, 0, -1)
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if err != nil {
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return nil, err
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}
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return db.xsort(values, offset, size, alpha, desc, sortBy, sortGet)
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}
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func (db *DB) XSSort(key []byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error) {
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values, err := db.SMembers(key)
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if err != nil {
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return nil, err
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}
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return db.xsort(values, offset, size, alpha, desc, sortBy, sortGet)
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}
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func (db *DB) XZSort(key []byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error) {
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values, err := db.ZRangeByLex(key, nil, nil, store.RangeClose, 0, -1)
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if err != nil {
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return nil, err
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}
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return db.xsort(values, offset, size, alpha, desc, sortBy, sortGet)
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}
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@ -0,0 +1,123 @@
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package ledis
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import (
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"runtime/debug"
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"testing"
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)
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func testBuildValues(values ...string) [][]byte {
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v := make([][]byte, 0, len(values))
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for _, value := range values {
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v = append(v, []byte(value))
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}
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return v
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}
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func checkSortRes(t *testing.T, res [][]byte, values ...string) {
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if len(res) != len(values) {
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debug.PrintStack()
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t.Fatalf("invalid xsort res len, %d = %d", len(res), len(values))
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}
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for i := 0; i < len(res); i++ {
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if string(res[i]) != values[i] {
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debug.PrintStack()
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t.Fatalf("invalid xsort res at %d, %s != %s", i, res[i], values[i])
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}
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}
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}
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func checkTestSort(t *testing.T, db *DB, items []string, offset int, size int, alpha bool,
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desc bool, sortBy []byte, sortGet [][]byte, checkValues []string) {
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vv := testBuildValues(items...)
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res, err := db.xsort(vv, offset, size, alpha, desc, sortBy, sortGet)
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if err != nil {
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t.Fatal(err)
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}
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checkSortRes(t, res, checkValues...)
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}
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func TestSort(t *testing.T) {
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db := getTestDB()
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db.FlushAll()
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// Prepare data
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db.MSet(
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KVPair{[]byte("weight_1"), []byte("30")},
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KVPair{[]byte("weight_2"), []byte("20")},
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KVPair{[]byte("weight_3"), []byte("10")},
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KVPair{[]byte("weight_a"), []byte("60")},
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KVPair{[]byte("weight_b"), []byte("50")},
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KVPair{[]byte("weight_c"), []byte("40")})
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db.HSet([]byte("hash_weight_1"), []byte("index"), []byte("30"))
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db.HSet([]byte("hash_weight_2"), []byte("index"), []byte("20"))
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db.HSet([]byte("hash_weight_3"), []byte("index"), []byte("10"))
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db.HSet([]byte("hash_weight_a"), []byte("index"), []byte("60"))
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db.HSet([]byte("hash_weight_b"), []byte("index"), []byte("50"))
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db.HSet([]byte("hash_weight_c"), []byte("index"), []byte("40"))
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db.MSet(
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KVPair{[]byte("object_1"), []byte("30")},
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KVPair{[]byte("object_2"), []byte("20")},
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KVPair{[]byte("object_3"), []byte("10")},
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KVPair{[]byte("number_1"), []byte("10")},
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KVPair{[]byte("number_2"), []byte("20")},
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KVPair{[]byte("number_3"), []byte("30")},
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KVPair{[]byte("object_a"), []byte("60")},
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KVPair{[]byte("object_b"), []byte("50")},
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KVPair{[]byte("object_c"), []byte("40")},
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KVPair{[]byte("number_a"), []byte("40")},
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KVPair{[]byte("number_b"), []byte("50")},
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KVPair{[]byte("number_c"), []byte("60")})
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db.HSet([]byte("hash_object_1"), []byte("index"), []byte("30"))
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db.HSet([]byte("hash_object_2"), []byte("index"), []byte("20"))
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db.HSet([]byte("hash_object_3"), []byte("index"), []byte("10"))
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db.HSet([]byte("hash_number_1"), []byte("index"), []byte("10"))
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db.HSet([]byte("hash_number_2"), []byte("index"), []byte("20"))
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db.HSet([]byte("hash_number_3"), []byte("index"), []byte("30"))
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db.HSet([]byte("hash_object_a"), []byte("index"), []byte("60"))
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db.HSet([]byte("hash_object_b"), []byte("index"), []byte("50"))
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db.HSet([]byte("hash_object_c"), []byte("index"), []byte("40"))
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db.HSet([]byte("hash_number_a"), []byte("index"), []byte("40"))
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db.HSet([]byte("hash_number_b"), []byte("index"), []byte("50"))
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db.HSet([]byte("hash_number_c"), []byte("index"), []byte("60"))
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, nil, nil, []string{"1", "2", "3"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, 1, false, false, nil, nil, []string{"1"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, 2, false, false, nil, nil, []string{"1", "2"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, 3, false, false, nil, nil, []string{"1", "2", "3"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, 4, false, false, nil, nil, []string{"1", "2", "3"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, true, false, nil, nil, []string{"1", "2", "3"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, true, nil, nil, []string{"3", "2", "1"})
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if _, err := db.xsort(testBuildValues("c", "b", "a"), 0, -1, false, false, nil, nil); err == nil {
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t.Fatal("must nil")
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}
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checkTestSort(t, db, []string{"c", "b", "a"}, 0, -1, true, false, nil, nil, []string{"a", "b", "c"})
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checkTestSort(t, db, []string{"c", "b", "a"}, 0, -1, true, true, nil, nil, []string{"c", "b", "a"})
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checkTestSort(t, db, []string{"1", "2", "3"}, 0, 1, false, false, nil, nil, []string{"1"})
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checkTestSort(t, db, []string{"1", "2", "3"}, 0, 1, false, true, nil, nil, []string{"3"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, []byte("abc"), nil, []string{"3", "2", "1"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, []byte("weight_*"), nil, []string{"3", "2", "1"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, true, []byte("weight_*"), nil, []string{"1", "2", "3"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, []byte("hash_weight_*->index"), nil, []string{"3", "2", "1"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, nil, [][]byte{[]byte("object_*")}, []string{"30", "20", "10"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, nil, [][]byte{[]byte("number_*")}, []string{"10", "20", "30"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, nil, [][]byte{[]byte("#"), []byte("number_*")},
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[]string{"1", "10", "2", "20", "3", "30"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, nil, [][]byte{[]byte("object_*"), []byte("number_*")},
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[]string{"30", "10", "20", "20", "10", "30"})
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checkTestSort(t, db, []string{"3", "2", "1"}, 0, -1, false, false, nil, [][]byte{[]byte("object_*_abc")}, []string{"", "", ""})
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}
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@ -0,0 +1,118 @@
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package server
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import (
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"bytes"
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"fmt"
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"strconv"
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"strings"
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)
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func xsort(c *client, tp string, key []byte, offset int, size int, alpha bool,
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desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error) {
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var ay [][]byte
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var err error
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switch strings.ToUpper(tp) {
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case "LIST":
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ay, err = c.db.XLSort(key, offset, size, alpha, desc, sortBy, sortGet)
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case "SET":
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ay, err = c.db.XSSort(key, offset, size, alpha, desc, sortBy, sortGet)
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case "ZSET":
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ay, err = c.db.XZSort(key, offset, size, alpha, desc, sortBy, sortGet)
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default:
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err = fmt.Errorf("invalid key type %s", tp)
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}
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return ay, err
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}
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func xlsortCommand(c *client) error {
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return handleXSort(c, "LIST")
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}
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func xssortCommand(c *client) error {
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return handleXSort(c, "SET")
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}
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func xzsortCommand(c *client) error {
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return handleXSort(c, "ZSET")
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}
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var ascArg = []byte("asc")
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var descArg = []byte("desc")
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var alphaArg = []byte("alpha")
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var limitArg = []byte("limit")
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var storeArg = []byte("store")
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var byArg = []byte("by")
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var getArg = []byte("get")
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func handleXSort(c *client, tp string) error {
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args := c.args
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if len(args) == 0 {
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return ErrCmdParams
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}
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key := args[0]
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desc := false
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alpha := false
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offset := 0
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size := 0
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var storeKey []byte
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var sortBy []byte
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var sortGet [][]byte
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var err error
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for i := 1; i < len(args); {
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if bytes.EqualFold(args[i], ascArg) {
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desc = false
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} else if bytes.EqualFold(args[i], descArg) {
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desc = true
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} else if bytes.EqualFold(args[i], alphaArg) {
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alpha = true
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} else if bytes.EqualFold(args[i], limitArg) && i+2 < len(args) {
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if offset, err = strconv.Atoi(string(args[i+1])); err != nil {
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return err
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}
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if size, err = strconv.Atoi(string(args[i+2])); err != nil {
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return err
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}
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i = i + 2
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} else if bytes.EqualFold(args[i], storeArg) && i+1 < len(args) {
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storeKey = args[i+1]
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i++
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} else if bytes.EqualFold(args[i], byArg) && i+1 < len(args) {
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sortBy = args[i+1]
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i++
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} else if bytes.EqualFold(args[i], getArg) && i+1 < len(args) {
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sortGet = append(sortGet, args[i+1])
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i++
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} else {
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return ErrCmdParams
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}
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i++
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}
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ay, err := xsort(c, tp, key, offset, size, alpha, desc, sortBy, sortGet)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if storeKey == nil {
|
||||
c.resp.writeSliceArray(ay)
|
||||
} else {
|
||||
// not threadsafe now, need lock???
|
||||
if _, err = c.db.LClear(storeKey); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if n, err := c.db.RPush(storeKey, ay...); err != nil {
|
||||
return err
|
||||
} else {
|
||||
c.resp.writeInteger(n)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func init() {
|
||||
register("xlsort", xlsortCommand)
|
||||
register("xssort", xssortCommand)
|
||||
register("xzsort", xzsortCommand)
|
||||
}
|
||||
|
|
@ -0,0 +1,91 @@
|
|||
package server
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
goledis "github.com/siddontang/ledisdb/client/go/ledis"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func checkTestSortRes(ay interface{}, checks []string) error {
|
||||
values, ok := ay.([]interface{})
|
||||
if !ok {
|
||||
return fmt.Errorf("invalid res type %T, must [][]byte", ay)
|
||||
}
|
||||
|
||||
if len(values) != len(checks) {
|
||||
return fmt.Errorf("invalid res number %d != %d", len(values), len(checks))
|
||||
}
|
||||
|
||||
for i, _ := range values {
|
||||
if string(values[i].([]byte)) != checks[i] {
|
||||
return fmt.Errorf("invalid res at %d, %s != %s", i, values[i], checks[i])
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func TestSort(t *testing.T) {
|
||||
c := getTestConn()
|
||||
defer c.Close()
|
||||
|
||||
key := "my_sort_key"
|
||||
storeKey := "my_sort_store_key"
|
||||
|
||||
if _, err := c.Do("LPUSH", key, 3, 2, 1); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if _, err := c.Do("MSET", "weight_1", 3, "weight_2", 2, "weight_3", 1); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if _, err := c.Do("MSET", "object_1", 10, "object_2", 20, "object_3", 30); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if ay, err := c.Do("XLSORT", key); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err = checkTestSortRes(ay, []string{"1", "2", "3"}); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if ay, err := c.Do("XLSORT", key, "DESC"); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err = checkTestSortRes(ay, []string{"3", "2", "1"}); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if ay, err := c.Do("XLSORT", key, "LIMIT", 0, 1); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err = checkTestSortRes(ay, []string{"1"}); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if ay, err := c.Do("XLSORT", key, "BY", "weight_*"); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err = checkTestSortRes(ay, []string{"3", "2", "1"}); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if ay, err := c.Do("XLSORT", key, "GET", "object_*"); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err = checkTestSortRes(ay, []string{"10", "20", "30"}); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if ay, err := c.Do("XLSORT", key, "GET", "object_*", "GET", "#"); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err = checkTestSortRes(ay, []string{"10", "1", "20", "2", "30", "3"}); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if n, err := goledis.Int(c.Do("XLSORT", key, "STORE", storeKey)); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if n != 3 {
|
||||
t.Fatalf("invalid return store sort number, %d != 3", n)
|
||||
} else if ay, err := c.Do("LRANGE", storeKey, 0, -1); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err = checkTestSortRes(ay, []string{"1", "2", "3"}); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue