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package main
import (
"context"
"fmt"
"github.com/redis/go-redis/v9"
)
func main() {
ctx := context.Background()
rdb := redis.NewClient(&redis.Options{
Addr: ":6379",
})
_ = rdb.FlushDB(ctx).Err()
fmt.Printf("# INCR BY\n")
for _, change := range []int{+1, +5, 0} {
num, err := incrBy.Run(ctx, rdb, []string{"my_counter"}, change).Int()
if err != nil {
panic(err)
}
fmt.Printf("incr by %d: %d\n", change, num)
}
fmt.Printf("\n# SUM\n")
sum, err := sum.Run(ctx, rdb, []string{"my_sum"}, 1, 2, 3).Int()
if err != nil {
panic(err)
}
fmt.Printf("sum is: %d\n", sum)
}
var incrBy = redis.NewScript(`
local key = KEYS[1]
local change = ARGV[1]
local value = redis.call("GET", key)
if not value then
value = 0
end
value = value + change
redis.call("SET", key, value)
return value
`)
var sum = redis.NewScript(`
local key = KEYS[1]
local sum = redis.call("GET", key)
if not sum then
sum = 0
end
local num_arg = #ARGV
for i = 1, num_arg do
sum = sum + ARGV[i]
end
redis.call("SET", key, sum)
return sum
`)
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