pkg/commands/decr.go


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package commands

import (
	"errors"
	"redisClone/pkg/core"
	"strconv"
)

func Decr(args []string, getShard func(k string) *core.Shard) interface{}{
	key := args[1]
	shard := getShard(key)
	item, exists := shard.Data[key]
		if exists {
			strValue, ok := item.Value.(string)
			if !ok {
				err := errors.New("value is not an integer or out of range")
				return err
			}

			currentInt, err := strconv.Atoi(strValue)
			if err != nil {
				err := errors.New("value is not an integer or out of range")
				return err
			}

			newValueStr := strconv.Itoa(currentInt - 1)
			shard.Data[key] = core.Item{Value: newValueStr}
			return currentInt - 1
		} else {
			shard.Data[key] = core.Item{Value: "-1"}
			return -1
		}
}