How to use Go language and Redis to implement automatic email sending

How to use Go language and Redis to implement automatic email sending

Email sending is a very common function in modern society, and many applications need to use email to send Notify, verify user identity, receive user feedback, etc. This article will introduce how to use Go language and Redis to implement automatic email sending function, and provide detailed code examples.

1. Preparation
Before starting, we need to ensure that the Go language environment and Redis database have been installed. If it has not been installed yet, you can refer to the relevant documents for installation and configuration.

2. Configure the environment

1. Create a new Go language project
   Execute the following command on the command line to create a new Go language project.

   mkdir email-sender
   cd email-sender
   go mod init email-sender

2. Install related dependency packages
   Create a file named main.go in the project root directory and put the following code into it.

   package main
   
   import (
    "fmt"
    "github.com/go-redis/redis"
   )
   
   func main() {
    // 创建Redis客户端
    client := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "", // 如果有密码，需要在这里填写
        DB:       0,  // 默认数据库
    })
   
    // 测试连接
    _, err := client.Ping().Result()
    if err != nil {
        panic(err)
    }
   
    fmt.Println("Redis连接成功")
   }

Next, execute the following command on the command line to install the go-redis package.

go get -u github.com/go-redis/redis

3. Implement the automatic email sending function

1. Add the sending email function
   Add the following code in the main.go file.

   package main
   
   import (
    "fmt"
    "github.com/go-redis/redis"
    "net/smtp"
    "strings"
   )
   
   func main() {
    // 创建Redis客户端
    client := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "", // 如果有密码，需要在这里填写
        DB:       0,  // 默认数据库
    })
   
    // 测试连接
    _, err := client.Ping().Result()
    if err != nil {
        panic(err)
    }
   
    fmt.Println("Redis连接成功")
   
    // 监听邮箱队列
    for {
        // 从队列中获取邮件数据
        result, err := client.BRPop(0, "email_queue").Result()
        if err != nil {
            panic(err)
        }
   
        // 解析邮件数据
        requestData := result[1]
        parts := strings.Split(requestData, ":")
        to := parts[0]
        subject := parts[1]
        body := parts[2]
   
        fmt.Printf("发送邮件到：%s
   ", to)
   
        // 发送邮件
        err = smtp.SendMail("smtp.example.com:587",
            smtp.PlainAuth("", "example@example.com", "password", "smtp.example.com"),
            "example@example.com",
            []string{to},
            []byte(fmt.Sprintf("Subject: %s
   
   %s", subject, body)))
   
        if err != nil {
            fmt.Printf("发送邮件失败：%s
   ", err.Error())
        } else {
            fmt.Println("发送邮件成功")
        }
    }
   }

2. Add emails to the queue
   Add the following code in the main.go file to add emails to be sent to the Redis queue.

   package main
   
   import (
    "fmt"
    "github.com/go-redis/redis"
   )
   
   func main() {
    // 创建Redis客户端
    client := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "", // 如果有密码，需要在这里填写
        DB:       0,  // 默认数据库
    })
   
    // 测试连接
    _, err := client.Ping().Result()
    if err != nil {
        panic(err)
    }
   
    fmt.Println("Redis连接成功")
   
    // 添加待发送的邮件到队列
    err = client.LPush("email_queue", "test@example.com:测试邮件:这是一封测试邮件").Err()
    if err != nil {
        panic(err)
    }
   
    fmt.Println("邮件添加到队列成功")
   }

4. Test sending email

1. Start the Redis server
   Execute the following command in the command line to start the Redis server.

   redis-server

2. Start the automatic email sending program
   Execute the following command on the command line to start the automatic email sending program.

   go run main.go

3. Add mail to the queue
   Execute the following command on the command line to add the mail to be sent to the Redis queue.

   go run main.go

4. Check the email sending status
   In the output of the automatic email sending program, you can see the email sending status. If the email is successfully sent, "Send email successfully" will be output. If the email fails, "Send email failed" will be output and the reason for the failure will be printed.

Conclusion
This article introduces in detail how to use Go language and Redis to implement the automatic email sending function. By studying the sample code in this article, readers can quickly get started and implement similar functions in their own applications. I hope this article can be helpful to everyone.

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