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index.go
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package rabbitmq
import (
"encoding/json"
"errors"
"fmt"
"github.com/streadway/amqp"
"log"
"strconv"
"time"
)
/**
* @Author: Connor
* @Date: 23.4.7 16:28
* @Description:
*/
// 定义全局变量,指针类型
var mqConn *amqp.Connection
var mqChan *amqp.Channel
const (
InitialTimeout = 5 // 默认失败重新间隔/s
DefaultExchangeName = "default.change" // 默认交换机
DefaultExchangeType = "direct" // 默认交换类型
)
// Receiver 定义接收者接口
type Receiver interface {
Consumer([]byte) error
FailAction(error, []byte) error
}
// RabbitMQ 定义RabbitMQ对象
type RabbitMQ struct {
connection *amqp.Connection
Channel *amqp.Channel
dns string
QueueName string // 队列名称
RoutingKey string // key名称
ExchangeName string // 交换机名称
ExchangeType string // 交换机类型
}
// QueueExchange 定义队列交换机对象,外部可调用
type QueueExchange struct {
QuName string // 队列名称
RtKey string // key值
ExName string // 交换机名称
ExType string // 交换机类型
Dns string //链接地址
}
// MqConnect 获取连接给 RabbitMQ
func (r *RabbitMQ) MqConnect() (err error) {
mqConn, err = amqp.Dial(r.dns)
r.connection = mqConn // 赋值给RabbitMQ对象
if err != nil {
fmt.Printf("rbmq链接失败 :%s \n", err)
}
return
}
// CloseMqConnect 关闭mq链接
func (r *RabbitMQ) CloseMqConnect() (err error) {
err = r.connection.Close()
if err != nil {
fmt.Printf("关闭mq链接失败 :%s \n", err)
}
return
}
// MqOpenChannel 获取信道给 RabbitMQ
func (r *RabbitMQ) MqOpenChannel() (err error) {
mqConn := r.connection
r.Channel, err = mqConn.Channel()
//defer mqChan.Close()
if err != nil {
fmt.Printf("MQ打开管道失败:%s \n", err)
}
return err
}
// CloseMqChannel 关闭rabbitMQ信道
func (r *RabbitMQ) CloseMqChannel() (err error) {
r.Channel.Close()
if err != nil {
fmt.Printf("关闭mq链接失败 :%s \n", err)
}
return err
}
// Send 生产者发送消息
func (mq *RabbitMQ) SendMsg(body interface{}) (err error) {
err = mq.MqOpenChannel()
ch := mq.Channel
if err != nil {
log.Printf("Channel err :%s \n", err)
}
defer func() {
_ = mq.Channel.Close()
}()
if mq.ExchangeName != "" {
if mq.ExchangeType == "" {
mq.ExchangeType = "direct"
}
err = ch.ExchangeDeclare(mq.ExchangeName, mq.ExchangeType, true, false, false, false, nil)
if err != nil {
log.Printf("ExchangeDeclare err :%s \n", err)
}
}
// 用于检查队列是否存在,已经存在不需要重复声明
_, err = ch.QueueDeclare(mq.QueueName, true, false, false, false, nil)
if err != nil {
log.Printf("QueueDeclare err :%s \n", err)
}
// 绑定任务
if mq.RoutingKey != "" && mq.ExchangeName != "" {
err = ch.QueueBind(mq.QueueName, mq.RoutingKey, mq.ExchangeName, false, nil)
if err != nil {
log.Printf("QueueBind err :%s \n", err)
}
}
// 处理body
bs, err := json.Marshal(body)
if err != nil {
log.Println(err)
return
}
log.Println("submit:" + string(bs))
if mq.ExchangeName != "" && mq.RoutingKey != "" {
err = mq.Channel.Publish(
mq.ExchangeName, // exchange
mq.RoutingKey, // routing key
false, // mandatory
false, // immediate
amqp.Publishing{
ContentType: "application/json",
Body: bs,
DeliveryMode: 2,
})
} else {
err = mq.Channel.Publish(
"", // exchange
mq.QueueName, // routing key
false, // mandatory
false, // immediate
amqp.Publishing{
ContentType: "application/json",
Body: bs,
DeliveryMode: 2,
})
}
return
}
// 消费者监听队列消费
func (mq *RabbitMQ) listenReceiver(receiver Receiver) {
err := mq.MqOpenChannel()
ch := mq.Channel
if err != nil {
log.Printf("Channel err :%s \n", err)
}
defer mq.Channel.Close()
if mq.ExchangeName != "" {
if mq.ExchangeType == "" {
mq.ExchangeType = "direct"
}
err = ch.ExchangeDeclare(mq.ExchangeName, mq.ExchangeType, true, false, false, false, nil)
if err != nil {
log.Printf("ExchangeDeclare err :%s \n", err)
}
}
// 用于检查队列是否存在,已经存在不需要重复声明
_, err = ch.QueueDeclare(mq.QueueName, true, false, false, false, nil)
if err != nil {
log.Printf("QueueDeclare err :%s \n", err)
}
// 绑定任务
if mq.RoutingKey != "" && mq.ExchangeName != "" {
err = ch.QueueBind(mq.QueueName, mq.RoutingKey, mq.ExchangeName, false, nil)
if err != nil {
log.Printf("QueueBind err :%s \n", err)
}
}
// 获取消费通道,确保rabbitMQ一个一个发送消息
err = ch.Qos(1, 0, false)
msgList, err := ch.Consume(mq.QueueName, "", false, false, false, false, nil)
if err != nil {
log.Printf("Consume err :%s \n", err)
}
for msg := range msgList {
retry_nums, ok := msg.Headers["retry_nums"].(int32)
if !ok {
retry_nums = int32(0)
}
// 处理数据
err := receiver.Consumer(msg.Body)
if err != nil {
//消息处理失败 进入延时尝试机制
if retry_nums < 3 {
fmt.Println(string(msg.Body))
fmt.Printf("消息处理失败 消息开始进入尝试 ttl延时队列 \n")
retryMsg(msg.Body, retry_nums, QueueExchange{
mq.QueueName,
mq.RoutingKey,
mq.ExchangeName,
mq.ExchangeType,
mq.dns,
})
} else {
//消息失败 入库db
fmt.Printf("消息处理3次后还是失败了 入库db 钉钉告警 \n")
receiver.FailAction(err, msg.Body)
}
err = msg.Ack(true)
if err != nil {
fmt.Printf("确认消息未完成异常:%s \n", err)
}
} else {
// 确认消息,必须为false
err = msg.Ack(true)
if err != nil {
fmt.Printf("消息消费ack失败 err :%s \n", err)
}
}
}
}
// SendDelayMsg 生产者发送延时消息
func (mq *RabbitMQ) SendDelayMsg(body string, ttl int64) (err error) {
err = mq.MqOpenChannel()
ch := mq.Channel
if err != nil {
log.Printf("Channel err :%s \n", err)
}
defer mq.Channel.Close()
if mq.ExchangeName != "" {
if mq.ExchangeType == "" {
mq.ExchangeType = "direct"
}
err = ch.ExchangeDeclare(mq.ExchangeName, mq.ExchangeType, true, false, false, false, nil)
if err != nil {
return
}
}
if ttl <= 0 {
return errors.New("发送延时消息,ttl参数是必须的")
}
table := make(map[string]interface{}, 3)
table["x-dead-letter-routing-key"] = mq.RoutingKey
table["x-dead-letter-exchange"] = mq.ExchangeName
table["x-message-ttl"] = ttl * 1000
//fmt.Printf("%+v",table)
//fmt.Printf("%+v",mq)
// 用于检查队列是否存在,已经存在不需要重复声明
ttlstring := strconv.FormatInt(ttl, 10)
queueName := fmt.Sprintf("%s_delay_%s", mq.QueueName, ttlstring)
routingKey := fmt.Sprintf("%s_delay_%s", mq.QueueName, ttlstring)
_, err = ch.QueueDeclare(queueName, true, false, false, false, table)
if err != nil {
return
}
// 绑定任务
if routingKey != "" && mq.ExchangeName != "" {
err = ch.QueueBind(queueName, routingKey, mq.ExchangeName, false, nil)
if err != nil {
return
}
}
header := make(map[string]interface{}, 1)
header["retry_nums"] = 0
var ttl_exchange string
var ttl_routkey string
if mq.ExchangeName != "" {
ttl_exchange = mq.ExchangeName
} else {
ttl_exchange = ""
}
if mq.RoutingKey != "" && mq.ExchangeName != "" {
ttl_routkey = routingKey
} else {
ttl_routkey = queueName
}
err = mq.Channel.Publish(
ttl_exchange, // exchange
ttl_routkey, // routing key
false, // mandatory
false, // immediate
amqp.Publishing{
ContentType: "application/json",
Body: []byte(body),
Headers: header,
})
if err != nil {
return
}
return
}
// SendRetryMsg 发送重试消息
func (mq *RabbitMQ) SendRetryMsg(body string, retry_nums int32, args ...string) {
err := mq.MqOpenChannel()
ch := mq.Channel
if err != nil {
log.Printf("Channel err :%s \n", err)
}
defer mq.Channel.Close()
if mq.ExchangeName != "" {
if mq.ExchangeType == "" {
mq.ExchangeType = "direct"
}
err = ch.ExchangeDeclare(mq.ExchangeName, mq.ExchangeType, true, false, false, false, nil)
if err != nil {
log.Printf("ExchangeDeclare err :%s \n", err)
}
}
//原始路由key
oldRoutingKey := args[0]
//原始交换机名
oldExchangeName := args[1]
table := make(map[string]interface{}, 3)
table["x-dead-letter-routing-key"] = oldRoutingKey
if oldExchangeName != "" {
table["x-dead-letter-exchange"] = oldExchangeName
} else {
mq.ExchangeName = ""
table["x-dead-letter-exchange"] = ""
}
table["x-message-ttl"] = int64(20000)
//fmt.Printf("%+v",table)
//fmt.Printf("%+v",mq)
// 用于检查队列是否存在,已经存在不需要重复声明
_, err = ch.QueueDeclare(mq.QueueName, true, false, false, false, table)
if err != nil {
log.Printf("QueueDeclare err :%s \n", err)
}
// 绑定任务
if mq.RoutingKey != "" && mq.ExchangeName != "" {
err = ch.QueueBind(mq.QueueName, mq.RoutingKey, mq.ExchangeName, false, nil)
if err != nil {
log.Printf("QueueBind err :%s \n", err)
}
}
header := make(map[string]interface{}, 1)
header["retry_nums"] = retry_nums + int32(1)
var ttl_exchange string
var ttl_routkey string
if mq.ExchangeName != "" {
ttl_exchange = mq.ExchangeName
} else {
ttl_exchange = ""
}
if mq.RoutingKey != "" && mq.ExchangeName != "" {
ttl_routkey = mq.RoutingKey
} else {
ttl_routkey = mq.QueueName
}
//fmt.Printf("ttl_exchange:%s,ttl_routkey:%s \n",ttl_exchange,ttl_routkey)
err = mq.Channel.Publish(
ttl_exchange, // exchange
ttl_routkey, // routing key
false, // mandatory
false, // immediate
amqp.Publishing{
ContentType: "application/json",
Body: []byte(body),
Headers: header,
})
if err != nil {
fmt.Printf("MQ任务发送失败:%s \n", err)
}
}
// NewMq 创建一个新的Mq操作对象,用于延迟消息处理
func NewMq(q QueueExchange) RabbitMQ {
return RabbitMQ{
QueueName: q.QuName,
RoutingKey: q.RtKey,
ExchangeName: q.ExName,
ExchangeType: q.ExType,
dns: q.Dns,
}
}
// Send 发送消息
func Send(queueExchange QueueExchange, msg interface{}) (err error) {
mq := NewMq(queueExchange)
err = mq.MqConnect()
if err != nil {
return
}
defer func() {
_ = mq.CloseMqConnect()
}()
err = mq.SendMsg(msg)
return
}
// ReceiveMsg 接收消息,连接失败后进行重试
func ReceiveMsg(queueExchange QueueExchange, receiver Receiver, otherParams ...int) (err error) {
var (
exitTask bool
maxTryConnNums int //rbmq链接失败后多久尝试一次
runNums int
maxTryConnTimeFromMinute int
)
if len(otherParams) <= 0 {
runNums = 1
maxTryConnTimeFromMinute = 0
} else if len(otherParams) == 1 {
runNums = otherParams[0]
maxTryConnTimeFromMinute = 0
} else if len(otherParams) == 2 {
runNums = otherParams[0]
maxTryConnTimeFromMinute = otherParams[1]
}
maxTryConnNums = maxTryConnTimeFromMinute * 10 * maxTryConnTimeFromMinute //rbmq链接失败后最大尝试次数
maxTryConnTime := time.Duration(InitialTimeout) //rbmq链接失败后多久尝试一次
mq := NewMq(queueExchange)
//链接rabbitMQ
err = mq.MqConnect()
if err != nil {
return
}
defer func() {
if panicErr := recover(); panicErr != nil {
fmt.Println(recover())
err = errors.New(fmt.Sprintf("%s", panicErr))
}
}()
//rbmq断开链接后 协程退出释放信号
taskQuit := make(chan struct{}, 1)
//尝试链接rbmq
tryToLinkC := make(chan struct{}, 1)
//最大尝试次数
tryToLinkMaxNums := make(chan struct{}, 1)
maxTryNums := 0 //尝试重启次数
//开始执行任务
for i := 1; i <= runNums; i++ {
go Recv2(mq, receiver, taskQuit)
}
//如果rbmq断开连接后 尝试重新建立链接
var tryToLink = func() {
for {
maxTryNums += 1
err = mq.MqConnect()
if err == nil {
tryToLinkC <- struct{}{}
break
}
if maxTryNums > maxTryConnNums {
fmt.Printf("正在尝试连接 mq")
tryToLinkMaxNums <- struct{}{}
break
}
//如果链接断开了 10秒重新尝试链接一次
time.Sleep(time.Second * maxTryConnTime)
fmt.Printf("正在尝试连接 mq maxTryNums=%d,maxTryConnNums=%d \n", maxTryNums, maxTryConnNums)
}
return
}
//scheduleTimer := time.NewTimer(time.Millisecond * 300)
exitTask = true
for {
select {
case <-tryToLinkC: //建立链接成功后 重新开启协程执行任务
fmt.Println("重新开启新的协程执行任务")
go Recv2(mq, receiver, taskQuit)
case <-tryToLinkMaxNums: //rbmq超出最大链接次数 退出任务
fmt.Println("rbmq链接超过最大尝试次数!")
exitTask = false
err = errors.New("rbmq链接超过最大尝试次数!")
case <-taskQuit: //rbmq断开连接后 开始尝试重新建立链接
fmt.Println("rbmq断开连接后 开始尝试重新建立链接")
go tryToLink()
//case <-scheduleTimer.C:
//fmt.Println("~~~~~~~~~~~~~~~~~~~~~~~")
}
// 重置调度间隔
//scheduleTimer.Reset(time.Millisecond * 300)
if !exitTask {
break
}
}
fmt.Println("exit")
return
}
// Recv2 当前监听队列关闭后通知进行重试机制
func Recv2(mq RabbitMQ, receiver Receiver, taskQuit chan<- struct{}) {
defer func() {
fmt.Println("rbmq链接失败,协程任务退出~~~~~~~~~~~~~~~~~~~~")
taskQuit <- struct{}{}
return
}()
// 验证链接是否正常
err := mq.MqOpenChannel()
if err != nil {
return
}
mq.listenReceiver(receiver)
}
//消息处理失败之后 延时尝试
func retryMsg(msg []byte, retry_nums int32, queueExchange QueueExchange) {
//原始队列名称 交换机名称
oldQName := queueExchange.QuName
oldExchangeName := queueExchange.ExName
oldRoutingKey := queueExchange.RtKey
if oldRoutingKey == "" || oldExchangeName == "" {
oldRoutingKey = oldQName
}
if queueExchange.QuName != "" {
queueExchange.QuName = queueExchange.QuName + "_retry_3"
}
if queueExchange.RtKey != "" {
queueExchange.RtKey = queueExchange.RtKey + "_retry_3"
} else {
queueExchange.RtKey = queueExchange.QuName + "_retry_3"
}
//fmt.Printf("%+v",queueExchange)
mq := NewMq(queueExchange)
_ = mq.MqConnect()
defer func() {
_ = mq.CloseMqConnect()
}()
//fmt.Printf("%+v",queueExchange)
mq.SendRetryMsg(string(msg), retry_nums, oldRoutingKey, oldExchangeName)
}