How to set cache expiration policy in Golang application?

There are three ways to set cache expiration policy in Golang applications: use time.Duration: set a fixed expiration time. Use expiration timestamp: Explicitly specify the expiration time. Use a custom expiration policy: flexibly set the expiration time through redis.HookFunc.

How to set cache expiration policy in Golang application?

Using caching in Golang applications can significantly improve performance. However, there is a time limit for the existence of cached items, and they need to be invalidated after this limit is exceeded. Here's how to set cache expiration policy in Golang:

Using time.Duration

The easiest way is to use the time.Duration type, which represents a time span. For example:

import (
    "context"
    "time"

    "github.com/go-redis/redis/v8"
)

func main() {
    ctx := context.Background()
    client := redis.NewClient(&redis.Options{
        Addr: "localhost:6379",
    })

    // 设置缓存值，过期时间为 10 分钟
    err := client.SetEX(ctx, "my-key", "my-value", 10*time.Minute).Err()
    if err != nil {
        panic(err)
    }
}

Use expiration timestamp

Another approach is to use expiration timestamp, which is a Unix timestamp that indicates when the cache item expires. For example:

import (
    "context"
    "time"

    "github.com/go-redis/redis/v8"
)

func main() {
    ctx := context.Background()
    client := redis.NewClient(&redis.Options{
        Addr: "localhost:6379",
    })

    // 设置缓存值，到期时间戳为 10 分钟后的时间
    expiration := time.Now().Add(10 * time.Minute).Unix()
    err := client.Set(ctx, "my-key", "my-value", time.Duration(expiration-time.Now().Unix())*time.Second).Err()
    if err != nil {
        panic(err)
    }
}

Custom expiration strategy

If you need a more complex expiration strategy, you can use redis.HookFunc. For example, you can set a custom expiration time based on cache item usage:

import (
    "context"
    "time"

    "github.com/go-redis/redis/v8"
)

func main() {
    ctx := context.Background()
    client := redis.NewClient(&redis.Options{
        Addr: "localhost:6379",
    })

    // 设置自定义过期策略
    client.AddHook(redis.AfterSetHookFunc(func(ctx context.Context, key string, value interface{}) {
        // 根据缓存项的使用情况计算到期时间
        expiration := calculateExpiration(key, value)

        // 设置到期时间戳
        client.Expire(ctx, key, time.Duration(expiration-time.Now().Unix())*time.Second)
    }))
}

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