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package commands
import (
"errors"
"redisClone/pkg/core"
)
func Lpop(args []string, getShard func(k string) *core.Shard) interface{}{
key := args[1]
s := getShard(key)
item, exists := s.Data[key]
if !exists {
return nil
}
typedList, ok := item.Value.([]string)
if !ok {
return errors.New("WRONGTYPE Operation against a key holding the wrong kind of value")
}
if len(typedList) == 0 {
return nil
}
newItem := typedList[0]
newList := typedList[1:]
if len(newList) <= 0 {
delete(s.Data, key)
} else {
s.Data[key] = core.Item{Value: newList}
}
return newItem
}
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