英文:
Redigo: Invalid memory address or nil pointer dereference while attempting to connect to pool
问题
> Redis连接中.....！恐慌：运行时错误：无效的内存地址或空指针解引用[信号0xb code=0x1 addr=0x28 pc=0x40154b] goroutine 1 [运行中]：runtime.panic(0x52c6e0, 0x6b6348) /usr/lib/go/src/pkg/runtime/panic.c:266 +0xb6 main.func·001(0xc21005102c, 0x0, 0x4bcd4c, 0x1) /home/vinay10949/redischeck/redischeck.go:21 +0x10b github.com/garyburd/redigo/redis.(*Pool).get(0xc210051000, 0x0, 0xc2100378f0, 0x42dbdf, 0x7fbe9c177070) /usr/lib/go/src/pkg/github.com/garyburd/redigo/redis/pool.go:250 +0x3a2 github.com/garyburd/redigo/redis.(*Pool).Get(0xc210051000, 0x1, 0x1) /usr/lib/go/src/pkg/github.com/garyburd/redigo/redis/pool.go:150 +0x27 main.main() /home/vinay10949/redischeck/redischeck.go:29 +0x13e
package mainimport ("flag""fmt""github.com/garyburd/redigo/redis"//"reflect")var (redisAddress = flag.String("10.12.2.121", "10.12.2.121:6379", "Redis服务器地址")maxConnections = flag.Int("max-connections", 10, "Redis最大连接数"))func main() {//Redis连接redisPool := redis.NewPool(func() (redis.Conn, error) {con, err := redis.Dial("tcp", *redisAddress)con.Do("SELECT", 1)if err != nil {return nil, err}return con, err}, *maxConnections)fmt.Println("Redis连接中...！")con := redisPool.Get()status, errStatus := con.Do("SET", "Name", "BookMyShow")if errStatus != nil {fmt.Println(errStatus)} else {fmt.Println("Redis已连接")}statusInsertion, _ := redis.String(status, errStatus)fmt.Println("插入状态：" + statusInsertion)value, _ := redis.String(con.Do("GET", "Name"))fmt.Println("检索到的值：" + value)}
这是一个使用Go语言编写的Redis连接代码。它尝试连接到指定的Redis服务器，并执行一些操作。在你提供的代码中，出现了一个运行时错误，导致程序崩溃。你可能需要检查代码中的错误，并确保Redis服务器的连接设置正确。
英文:
> Redis Connecting.....! panic: runtime error: invalid memory address or
> nil pointer dereference [signal 0xb code=0x1 addr=0x28 pc=0x40154b]
> goroutine 1 [running]: runtime.panic(0x52c6e0, 0x6b6348)
> /usr/lib/go/src/pkg/runtime/panic.c:266 +0xb6
> main.func·001(0xc21005102c, 0x0, 0x4bcd4c, 0x1)
> /home/vinay10949/redischeck/redischeck.go:21 +0x10b
> github.com/garyburd/redigo/redis.(*Pool).get(0xc210051000, 0x0,
> 0xc2100378f0, 0x42dbdf, 0x7fbe9c177070)
> /usr/lib/go/src/pkg/github.com/garyburd/redigo/redis/pool.go:250
> +0x3a2 github.com/garyburd/redigo/redis.(*Pool).Get(0xc210051000, 0x1, 0x1) > /usr/lib/go/src/pkg/github.com/garyburd/redigo/redis/pool.go:150
> +0x27 main.main() /home/
>
> vinay10949/redischeck/redischeck.go:29 +0x13e
package mainimport ("flag""fmt""github.com/garyburd/redigo/redis"//"reflect")var (redisAddress = flag.String("10.12.2.121", "10.12.2.121:6379", "Address to the Redis server")maxConnections = flag.Int("max-connections", 10, "Max connections to Redis"))func main() {//Redis ConnectionredisPool := redis.NewPool(func() (redis.Conn, error) {con, err := redis.Dial("tcp", *redisAddress)con.Do("SELECT", 1)if err != nil {return nil, err}return con, err}, *maxConnections)fmt.Println("Redis Connecting...!")con := redisPool.Get()status, errStatus := con.Do("SET", "Name", "BookMyShow")if errStatus != nil {fmt.Println(errStatus)} else {fmt.Println("Redis Connected")}statusInsertion, _ := redis.String(status, errStatus)fmt.Println("Status of Insertion :" + statusInsertion)value, _ := redis.String(con.Do("GET", "Name"))fmt.Println("Value Retrieved : " + value)}
答案1
得分: 5
你犯了一个错误，是在使用返回值之后才检查错误：
con, err := redis.Dial("tcp", *redisAddress)con.Do("SELECT", 1) // 在这里你正在使用可能为nil的conif err != nil {return nil, err}
请重新排列代码：
con, err := redis.Dial("tcp", *redisAddress)if err != nil {return nil, err}con.Do("SELECT", 1) // 在检查错误之后再使用con
英文:
You are making the mistake of checking for an error after using the returned value:
con, err := redis.Dial("tcp", *redisAddress)con.Do("SELECT", 1) // Here you are using con which most likely is nilif err != nil {return nil, err}
Rearrange the code to:
con, err := redis.Dial("tcp", *redisAddress)if err != nil {return nil, err}con.Do("SELECT", 1) // con should be used after checking for errors
答案2
得分: 0
con, err := redis.Dial("tcp", *redisAddress)
if err != nil {
return nil, err
}
con.Do("SELECT", 0) //选择0号数据库，用于Nutcracker
英文:
con, err := redis.Dial("tcp", *redisAddress)if err != nil {return nil, err}con.Do("SELECT", 0) //Select 0 for Nutcracker
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