refactored LRANGE

1 files changed, 52 insertions, 0 deletions

diff --git a/pkg/commands/lrange.go b/pkg/commands/lrange.go
new file mode 100644
index 0000000..d2b6ff3
--- /dev/null
+++ b/pkg/commands/lrange.go
@@ -0,0 +1,52 @@
+package commands
+
+import (
+	"errors"
+	"redisClone/pkg/core"
+	"strconv"
+	"time"
+)
+
+func Lrange(args []string, getShard func(k string) *core.Shard) interface{}{
+	start, err1 := strconv.Atoi(args[2])
+	stop, err2 := strconv.Atoi(args[3])
+	if err1 != nil || err2 != nil {
+		err := errors.New("value is not an integer or out of range")
+		return err
+	}
+	key := args[1]
+	s := getShard(key)
+
+	item, exists := s.Data[key]
+	if !exists {
+		return []string{}
+	}
+	if item.ExpiresAt != nil && time.Now().After(*item.ExpiresAt) {
+		delete(s.Data, key)
+		return nil
+	}
+	typedList, ok := item.Value.([]string)
+	if !ok {
+		return errors.New("WRONGTYPE Operation against a key holding the wrong kind of value")
+	}
+	size := len(typedList)
+	if start < 0 {
+		start += size
+		if start < 0 {
+			start = 0
+		}
+	}
+	if stop < 0 {
+		stop += size
+		if stop < 0 {
+			stop = 0
+		}
+	}
+	if stop >= size {
+		stop = size - 1
+	}
+	if start > stop || start >= size {
+		return []string{}
+	}
+		return typedList[start : stop+1]
+}
\ No newline at end of file