golang實現連接池的方法

這篇文章將為大家詳細講解有關golang實現連接池的方法，小編覺得挺實用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。

Reids

安裝導入

go get github.com/garyburd/redigo/redis
import "github.com/garyburd/redigo/redis"

使用

連接

import "github.com/garyburd/redigo/redis"

func main() {
    c, err := redis.Dial("tcp", "localhost:6379")
    if err != nil {
        fmt.Println("conn redis failed, err:", err)
        return
    }
    defer c.Close()
}

set & get

       _, err = c.Do("Set", "name", "nick")
    if err != nil {
        fmt.Println(err)
        return
    }

    r, err := redis.String(c.Do("Get", "name"))
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(r)

mset & mget

批量設置

      _, err = c.Do("MSet", "name", "nick", "age", "18")
    if err != nil {
        fmt.Println("MSet error: ", err)
        return
    }

    r2, err := redis.Strings(c.Do("MGet", "name", "age"))
    if err != nil {
        fmt.Println("MGet error: ", err)
        return
    }
    fmt.Println(r2)

hset & hget

hash操作

   _, err = c.Do("HSet", "names", "nick", "suoning")
    if err != nil {
        fmt.Println("hset error: ", err)
        return
    }

    r, err = redis.String(c.Do("HGet", "names", "nick"))
    if err != nil {
        fmt.Println("hget error: ", err)
        return
    }
    fmt.Println(r)

expire

設置過期時間

   _, err = c.Do("expire", "names", 5)
    if err != nil {
        fmt.Println("expire error: ", err)
        return
    }

lpush & lpop & llen

隊列

 // 隊列
    _, err = c.Do("lpush", "Queue", "nick", "dawn", 9)
    if err != nil {
        fmt.Println("lpush error: ", err)
        return
    }
    for {
        r, err = redis.String(c.Do("lpop", "Queue"))
        if err != nil {
            fmt.Println("lpop error: ", err)
            break
        }
        fmt.Println(r)
    }
    r3, err := redis.Int(c.Do("llen", "Queue"))
    if err != nil {
        fmt.Println("llen error: ", err)
        return
    }

連接池

各參數的解釋如下：

MaxIdle：最大的空閑連接數，表示即使沒有redis連接時依然可以保持N個空閑的連接，而不被清除，隨時處于待命狀態。

MaxActive：最大的激活連接數，表示同時最多有N個連接

IdleTimeout：最大的空閑連接等待時間，超過此時間后，空閑連接將被關閉

  pool := &redis.Pool{
        MaxIdle:     16,
        MaxActive:   1024,
        IdleTimeout: 300,
        Dial: func() (redis.Conn, error) {
            return redis.Dial("tcp", "localhost:6379")
        },
    }

連接池例子：

package main

import (
    "fmt"

    "github.com/garyburd/redigo/redis"
)

var pool *redis.Pool

func init() {
    pool = &redis.Pool{
        MaxIdle:     16,
        MaxActive:   1024,
        IdleTimeout: 300,
        Dial: func() (redis.Conn, error) {
            return redis.Dial("tcp", "localhost:6379")
        },
    }
}

func main() {
    c := pool.Get()
    defer c.Close()

    _, err := c.Do("Set", "name", "nick")
    if err != nil {
        fmt.Println(err)
        return
    }

    r, err := redis.String(c.Do("Get", "name"))
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(r)
}

管道操作

請求/響應服務可以實現持續處理新請求，客戶端可以發送多個命令到服務器而無需等待響應，最后在一次讀取多個響應。

使用Send()，Flush()，Receive()方法支持管道化操作

Send向連接的輸出緩沖中寫入命令。

Flush將連接的輸出緩沖清空并寫入服務器端。

Recevie按照FIFO順序依次讀取服務器的響應。

func main() {
    c, err := redis.Dial("tcp", "localhost:6379")
    if err != nil {
        fmt.Println("conn redis failed, err:", err)
        return
    }
    defer c.Close()

    c.Send("SET", "name1", "sss1")
    c.Send("SET", "name2", "sss2")

    c.Flush()

    v, err := c.Receive()
    fmt.Printf("v:%v,err:%v\n", v, err)
    v, err = c.Receive()
    fmt.Printf("v:%v,err:%v\n", v, err)

    v, err = c.Receive()    // 夯住，一直等待
    fmt.Printf("v:%v,err:%v\n", v, err)
}

Mysql

安裝導入

go get "github.com/go-sql-driver/mysql"
go get "github.com/jmoiron/sqlx"

import (
    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

連接

import (
    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

var Db *sqlx.DB

func init() {

    database, err := sqlx.Open("mysql", "root:@tcp(127.0.0.1:3306)/test")
    if err != nil {
        fmt.Println("open mysql failed,", err)
        return
    }

    Db = database
}

建表

CREATE TABLE `person` (
  `user_id` int(128) DEFAULT NULL,
  `username` varchar(255) DEFAULT NULL,
  `sex` varchar(16) DEFAULT NULL,
  `email` varchar(128) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8

（insert）

package main

import (
    "fmt"

    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

type Person struct {
    UserId   int    `db:"user_id"`
    Username string `db:"username"`
    Sex      string `db:"sex"`
    Email    string `db:"email"`
}

var Db *sqlx.DB

func init() {
    database, err := sqlx.Open("mysql", "root:@tcp(127.0.0.1:3306)/test")
    if err != nil {
        fmt.Println("open mysql failed,", err)
        return
    }
    Db = database
}

func main() {
    r, err := Db.Exec("insert into person(username, sex, email)values(?, ?, ?)", "suoning", "man", "suoning@net263.com")
    if err != nil {
        fmt.Println("exec failed, ", err)
        return
    }
    id, err := r.LastInsertId()
    if err != nil {
        fmt.Println("exec failed, ", err)
        return
    }

    fmt.Println("insert succ:", id)
}

（update）

package main

import (
    "fmt"

    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

type Person struct {
    UserId   int    `db:"user_id"`
    Username string `db:"username"`
    Sex      string `db:"sex"`
    Email    string `db:"email"`
}

var Db *sqlx.DB

func init() {

    database, err := sqlx.Open("mysql", "root:@tcp(127.0.0.1:3306)/test")
    if err != nil {
        fmt.Println("open mysql failed,", err)
        return
    }

    Db = database
}

func main() {

    _, err := Db.Exec("update person set user_id=? where username=?", 20170808, "suoning")
    if err != nil {
        fmt.Println("exec failed, ", err)
        return
    }

}

（select）

package main

import (
    "fmt"

    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

type Person struct {
    UserId   int    `db:"user_id"`
    Username string `db:"username"`
    Sex      string `db:"sex"`
    Email    string `db:"email"`
}

type Place struct {
    Country string `db:"country"`
    City    string `db:"city"`
    TelCode int    `db:"telcode"`
}

var Db *sqlx.DB

func init() {

    database, err := sqlx.Open("mysql", "root:@tcp(127.0.0.1:3306)/test")
    if err != nil {
        fmt.Println("open mysql failed,", err)
        return
    }

    Db = database
}

func main() {

    var person []Person
    err := Db.Select(&person, "select user_id, username, sex, email from person where user_id=?", 1)
    if err != nil {
        fmt.Println("exec failed, ", err)
        return
    }
    fmt.Println("select succ:", person)

    people := []Person{}
    Db.Select(&people, "SELECT * FROM person ORDER BY user_id ASC")
    fmt.Println(people)
    jason, john := people[0], people[1]
    fmt.Printf("%#v\n%#v", jason, john)
}

（delete）

package main

import (
    "fmt"

    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

type Person struct {
    UserId   int    `db:"user_id"`
    Username string `db:"username"`
    Sex      string `db:"sex"`
    Email    string `db:"email"`
}

var Db *sqlx.DB

func init() {

    database, err := sqlx.Open("mysql", "root:@tcp(127.0.0.1:3306)/test")
    if err != nil {
        fmt.Println("open mysql failed,", err)
        return
    }

    Db = database
}

func main() {

    _, err := Db.Exec("delete from person where username=? limit 1", "suoning")
    if err != nil {
        fmt.Println("exec failed, ", err)
        return
    }

    fmt.Println("delete succ")
}

事務

package main

import (
    "github.com/astaxie/beego/logs"
    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

var Db *sqlx.DB

func init() {
    database, err := sqlx.Open("mysql", "root:@tcp(127.0.0.1:3306)/test")
    if err != nil {
        logs.Error("open mysql failed,", err)
        return
    }
    Db = database
}

func main()  {
    conn, err := Db.Begin()
    if err != nil {
        logs.Warn("DB.Begin failed, err:%v", err)
        return
    }

    defer func() {
        if err != nil {
            conn.Rollback()
            return
        }
        conn.Commit()
    }()

    // do something
}

RabbitMQ

安裝

go get "github.com/streadway/amqp"

普通模式

生產者：

package main

import (    "fmt"
    "log"
    "os"
    "strings"

    "github.com/streadway/amqp"
    "time")/*默認點對點模式*/func failOnError(err error, msg string) {    if err != nil {
        log.Fatalf("%s: %s", msg, err)
        panic(fmt.Sprintf("%s: %s", msg, err))
    }
}

func main() {    // 連接
    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    failOnError(err, "Failed to connect to RabbitMQ")
    defer conn.Close()    // 打開一個并發服務器通道來處理消息
    ch, err := conn.Channel()
    failOnError(err, "Failed to open a channel")
    defer ch.Close()    // 申明一個隊列
    q, err := ch.QueueDeclare(        "task_queue", // name
        true,         // durable  持久性的,如果事前已經聲明了該隊列，不能重復聲明
        false,        // delete when unused
        false,        // exclusive 如果是真，連接一斷開，隊列刪除
        false,        // no-wait
        nil,          // arguments    )
    failOnError(err, "Failed to declare a queue")

    body := bodyFrom(os.Args)    // 發布
    err = ch.Publish(        "",     // exchange 默認模式，exchange為空
        q.Name,           // routing key 默認模式路由到同名隊列，即是task_queue
        false,  // mandatory
        false,
        amqp.Publishing{            // 持久性的發布，因為隊列被聲明為持久的，發布消息必須加上這個（可能不用），但消息還是可能會丟，如消息到緩存但MQ掛了來不及持久化。            DeliveryMode: amqp.Persistent,
            ContentType:  "text/plain",
            Body:         []byte(body),
        })
    failOnError(err, "Failed to publish a message")
    log.Printf(" [x] Sent %s", body)
}

func bodyFrom(args []string) string {    var s string
    if (len(args) < 2) || os.Args[1] == "" {
        s = fmt.Sprintf("%s-%v","hello", time.Now())
    } else {
        s = strings.Join(args[1:], " ")
    }    return s
}

消費者：

package main

import (
    "bytes"
    "fmt"
    "github.com/streadway/amqp"
    "log"
    "time"
)

/*
默認點對點模式
工作方，多個，拿發布方的消息
*/

func failOnError(err error, msg string) {
    if err != nil {
        log.Fatalf("%s: %s", msg, err)
        panic(fmt.Sprintf("%s: %s", msg, err))
    }
}

func main() {
    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    failOnError(err, "Failed to connect to RabbitMQ")
    defer conn.Close()

    ch, err := conn.Channel()
    failOnError(err, "Failed to open a channel")
    defer ch.Close()

    // 指定隊列！
    q, err := ch.QueueDeclare(
        "task_queue", // name
        true,         // durable
        false,        // delete when unused
        false,        // exclusive
        false,        // no-wait
        nil,          // arguments
    )
    failOnError(err, "Failed to declare a queue")

    // Fair dispatch 預取，每個工作方每次拿一個消息，確認后才拿下一次，緩解壓力
    err = ch.Qos(
        1,     // prefetch count
        0,     // prefetch size
        false, // global
    )
    failOnError(err, "Failed to set QoS")

    // 消費根據隊列名
    msgs, err := ch.Consume(
        q.Name, // queue
        "",     // consumer
        false,  // auto-ack   設置為真自動確認消息
        false,  // exclusive
        false,  // no-local
        false,  // no-wait
        nil,    // args
    )
    failOnError(err, "Failed to register a consumer")

    forever := make(chan bool)

    go func() {
        for d := range msgs {
            log.Printf("Received a message: %s", d.Body)
            dot_count := bytes.Count(d.Body, []byte("."))
            t := time.Duration(dot_count)
            time.Sleep(t * time.Second)
            log.Printf("Done")

            // 確認消息被收到！！如果為真的，那么同在一個channel,在該消息之前未確認的消息都會確認，適合批量處理
            // 真時場景：每十條消息確認一次，類似
            d.Ack(false)
        }
    }()

    log.Printf(" [*] Waiting for messages. To exit press CTRL+C")
    <-forever
}

訂閱模式

訂閱 生產者：

package main

import (
    "fmt"
    "github.com/streadway/amqp"
    "log"
    "os"
    "strings"
    "time"
)

/*
廣播模式
發布方
*/

func failOnError(err error, msg string) {
    if err != nil {
        log.Fatalf("%s: %s", msg, err)
        panic(fmt.Sprintf("%s: %s", msg, err))
    }
}

func main() {
    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    failOnError(err, "Failed to connect to RabbitMQ")
    defer conn.Close()

    ch, err := conn.Channel()
    failOnError(err, "Failed to open a channel")
    defer ch.Close()

    // 默認模式有默認交換機，廣播自己定義一個交換機，交換機可與隊列進行綁定
    err = ch.ExchangeDeclare(
        "logs",   // name
        "fanout", // type 廣播模式
        true,     // durable
        false,    // auto-deleted
        false,    // internal
        false,    // no-wait
        nil,      // arguments
    )
    failOnError(err, "Failed to declare an exchange")

    body := bodyFrom(os.Args)

    // 發布
    err = ch.Publish(
        "logs", // exchange 消息發送到交換機，這個時候沒隊列綁定交換機，消息會丟棄
        "",     // routing key  廣播模式不需要這個，它會把所有消息路由到綁定的所有隊列
        false,  // mandatory
        false,  // immediate
        amqp.Publishing{
            ContentType: "text/plain",
            Body:        []byte(body),
        })
    failOnError(err, "Failed to publish a message")

    log.Printf(" [x] Sent %s", body)
}

func bodyFrom(args []string) string {
    var s string
    if (len(args) < 2) || os.Args[1] == "" {
        s = fmt.Sprintf("%s-%v","hello", time.Now())
    } else {
        s = strings.Join(args[1:], " ")
    }
    return s
}

訂閱 消費者：

package main

import (
    "fmt"
    "github.com/streadway/amqp"
    "log"
)

/*
廣播模式
訂閱方
*/

func failOnError(err error, msg string) {
    if err != nil {
        log.Fatalf("%s: %s", msg, err)
        panic(fmt.Sprintf("%s: %s", msg, err))
    }
}

func main() {
    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    failOnError(err, "Failed to connect to RabbitMQ")
    defer conn.Close()

    ch, err := conn.Channel()
    failOnError(err, "Failed to open a channel")
    defer ch.Close()

    // 同樣要申明交換機
    err = ch.ExchangeDeclare(
        "logs",   // name
        "fanout", // type
        true,     // durable
        false,    // auto-deleted
        false,    // internal
        false,    // no-wait
        nil,      // arguments
    )
    failOnError(err, "Failed to declare an exchange")

    // 新建隊列，這個隊列沒名字，隨機生成一個名字
    q, err := ch.QueueDeclare(
        "",    // name
        false, // durable
        false, // delete when usused
        true,  // exclusive  表示連接一斷開，這個隊列自動刪除
        false, // no-wait
        nil,   // arguments
    )
    failOnError(err, "Failed to declare a queue")

    // 隊列和交換機綁定，即是隊列訂閱了發到這個交換機的消息
    err = ch.QueueBind(
        q.Name, // queue name  隊列的名字
        "",     // routing key  廣播模式不需要這個
        "logs", // exchange  交換機名字
        false,
        nil)
    failOnError(err, "Failed to bind a queue")

    // 開始消費消息，可開多個訂閱方，因為隊列是臨時生成的，所有每個訂閱方都能收到同樣的消息
    msgs, err := ch.Consume(
        q.Name, // queue  隊列名字
        "",     // consumer
        true,   // auto-ack  自動確認
        false,  // exclusive
        false,  // no-local
        false,  // no-wait
        nil,    // args
    )
    failOnError(err, "Failed to register a consumer")

    forever := make(chan bool)

    go func() {
        for d := range msgs {
            log.Printf(" [x] %s", d.Body)
        }
    }()

    log.Printf(" [*] Waiting for logs. To exit press CTRL+C")
    <-forever
}

RPC模式

RPC 應答方：

package main

import (
    "fmt"
    "log"
    "strconv"

    "github.com/streadway/amqp"
)

/*
RPC模式
應答方
*/

func failOnError(err error, msg string) {
    if err != nil {
        log.Fatalf("%s: %s", msg, err)
        panic(fmt.Sprintf("%s: %s", msg, err))
    }
}

func fib(n int) int {
    if n == 0 {
        return 0
    } else if n == 1 {
        return 1
    } else {
        return fib(n-1) + fib(n-2)
    }
}

func main() {

    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    failOnError(err, "Failed to connect to RabbitMQ")
    defer conn.Close()

    ch, err := conn.Channel()
    failOnError(err, "Failed to open a channel")
    defer ch.Close()

    q, err := ch.QueueDeclare(
        "rpc_queue", // name
        false,       // durable
        false,       // delete when usused
        false,       // exclusive
        false,       // no-wait
        nil,         // arguments
    )
    failOnError(err, "Failed to declare a queue")

    // 公平分發 沒有這個則round-robbin
    err = ch.Qos(
        1,     // prefetch count
        0,     // prefetch size
        false, // global
    )
    failOnError(err, "Failed to set QoS")

    // 消費，等待請求
    msgs, err := ch.Consume(
        q.Name, // queue
        "",     // consumer
        false,  // auto-ack
        false,  // exclusive
        false,  // no-local
        false,  // no-wait
        nil,    // args
    )
    failOnError(err, "Failed to register a consumer")

    forever := make(chan bool)

    go func() {
        //請求來了
        for d := range msgs {
            n, err := strconv.Atoi(string(d.Body))
            failOnError(err, "Failed to convert body to integer")

            log.Printf(" [.] fib(%d)", n)

            // 計算
            response := fib(n)

            // 回答
            err = ch.Publish(
                "",        // exchange
                d.ReplyTo, // routing key
                false,     // mandatory
                false,     // immediate
                amqp.Publishing{
                    ContentType:   "text/plain",
                    CorrelationId: d.CorrelationId,  //序列號
                    Body:          []byte(strconv.Itoa(response)),
                })
            failOnError(err, "Failed to publish a message")

            // 確認回答完畢
            d.Ack(false)
        }
    }()

    log.Printf(" [*] Awaiting RPC requests")
    <-forever
}

RPC 請求方：

package main

import (
    "fmt"
    "log"
    "math/rand"
    "os"
    "strconv"
    "strings"
    "time"

    "github.com/streadway/amqp"
)

/*
RPC模式
請求方
*/

func failOnError(err error, msg string) {
    if err != nil {
        log.Fatalf("%s: %s", msg, err)
        panic(fmt.Sprintf("%s: %s", msg, err))
    }
}

func randomString(l int) string {
    bytes := make([]byte, l)
    for i := 0; i < l; i++ {
        bytes[i] = byte(randInt(65, 90))
    }
    return string(bytes)
}

func randInt(min int, max int) int {
    return min + rand.Intn(max-min)
}

func fibonacciRPC(n int) (res int, err error) {

    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    failOnError(err, "Failed to connect to RabbitMQ")
    defer conn.Close()

    ch, err := conn.Channel()
    failOnError(err, "Failed to open a channel")
    defer ch.Close()

    // 隊列聲明
    q, err := ch.QueueDeclare(
        "",    // name
        false, // durable
        false, // delete when usused
        true,  // exclusive 為真即連接斷開就刪除
        false, // noWait
        nil,   // arguments
    )
    failOnError(err, "Failed to declare a queue")

    msgs, err := ch.Consume(
        q.Name, // queue
        "",     // consumer
        true,   // auto-ack
        false,  // exclusive   這個為真，服務器會認為這是該隊列唯一的消費者
        false,  // no-local
        false,  // no-wait
        nil,    // args
    )
    failOnError(err, "Failed to register a consumer")

    corrId := randomString(32)

    err = ch.Publish(
        "",          // exchange
        "rpc_queue", // routing key
        false,       // mandatory
        false,       // immediate
        amqp.Publishing{
            ContentType:   "text/plain",
            CorrelationId: corrId,
            ReplyTo:       q.Name,
            Body:          []byte(strconv.Itoa(n)),
        })
    failOnError(err, "Failed to publish a message")

    for d := range msgs {
        if corrId == d.CorrelationId {
            res, err = strconv.Atoi(string(d.Body))
            failOnError(err, "Failed to convert body to integer")
            break
        }
    }

    return
}

func main() {
    rand.Seed(time.Now().UTC().UnixNano())

    n := bodyFrom(os.Args)

    log.Printf(" [x] Requesting fib(%d)", n)
    res, err := fibonacciRPC(n)
    failOnError(err, "Failed to handle RPC request")

    log.Printf(" [.] Got %d", res)
}

func bodyFrom(args []string) int {
    var s string
    if (len(args) < 2) || os.Args[1] == "" {
        s = "30"
    } else {
        s = strings.Join(args[1:], " ")
    }
    n, err := strconv.Atoi(s)
    failOnError(err, "Failed to convert arg to integer")
    return n
}

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