249 lines
6.4 KiB
Go
249 lines
6.4 KiB
Go
/**
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* @Company: 云南奇讯科技有限公司
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* @Author: yxf
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* @Description:
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* @Date: 2023/7/7 14:54
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*/
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package diskqueue
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import (
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"bytes"
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"context"
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"encoding/binary"
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"errors"
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"fmt"
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"github.com/gogf/gf/v2/frame/g"
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"github.com/gogf/gf/v2/util/grand"
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"github.com/tiger1103/gfast/v3/internal/app/mqueue/consts"
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disk "github.com/tiger1103/gfast/v3/internal/app/mqueue/driver"
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"github.com/tiger1103/gfast/v3/internal/app/mqueue/model"
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"io"
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"os"
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"sync"
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"time"
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)
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func logger(ctx context.Context) disk.AppLogFunc {
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return func(lvl disk.LogLevel, f string, args ...interface{}) {
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switch lvl {
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case disk.FATAL:
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g.Log("diskQueue").Fatal(ctx, fmt.Sprintf(f, args...))
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case disk.DEBUG:
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g.Log("diskQueue").Debug(ctx, fmt.Sprintf(f, args...))
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case disk.INFO:
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g.Log("diskQueue").Info(ctx, fmt.Sprintf(f, args...))
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case disk.WARN:
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g.Log("diskQueue").Warning(ctx, fmt.Sprintf(f, args...))
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case disk.ERROR:
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g.Log("diskQueue").Error(ctx, fmt.Sprintf(f, args...))
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}
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}
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}
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type client struct {
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name string
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diskQueue disk.IDiskQueue
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channelConsumers map[string][]*consumer
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exitChan chan struct{}
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logger disk.AppLogFunc
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sync.Mutex
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}
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// 磁盘消息队列实例
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var clientMap = make(map[string]*client)
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var clientMutex sync.Mutex
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// registerDiskQueue 创建磁盘队列的实例
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func registerDiskQueue(topic string) error {
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if _, ok := clientMap[topic]; ok {
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return errors.New(fmt.Sprintf("实例 %s 已经存在", topic))
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}
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var dc *model.DiskQueueConfig
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err := g.Cfg().MustGet(context.TODO(), "mqueue.diskQueue").Struct(&dc)
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if err != nil {
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return err
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}
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// 数据文件夹不存在则创建
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if stat, err2 := os.Stat(dc.DataPath); stat == nil || os.IsNotExist(err2) {
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err3 := os.MkdirAll(dc.DataPath, os.ModePerm)
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if err3 != nil {
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return err3
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}
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}
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clientMap[topic] = &client{
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name: topic,
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diskQueue: disk.NewDiskQueue(topic, dc.DataPath, dc.MaxBytesPerFile, dc.MinMsgSize, dc.MaxMsgSize, dc.SyncEvery, dc.SyncTimeout*time.Second, logger(context.TODO())),
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channelConsumers: make(map[string][]*consumer),
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exitChan: make(chan struct{}),
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logger: logger(context.TODO()),
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}
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// 开始消息循环
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go clientMap[topic].start()
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return nil
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}
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// 根据提供的topic 返回一个已注册的diskQueue实例，如果实例不存在，则创建一个返回
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func getClient(topic string) (c *client, err error) {
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clientMutex.Lock()
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defer clientMutex.Unlock()
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if _, ok := clientMap[topic]; !ok {
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err = registerDiskQueue(topic)
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if err != nil {
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return nil, err
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}
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}
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return clientMap[topic], nil
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}
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// RegisterConsumer 注册消费者到对应频道
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func (c *client) RegisterConsumer(channel string, consumer *consumer) {
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c.Lock()
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defer c.Unlock()
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c.channelConsumers[channel] = append(c.channelConsumers[channel], consumer)
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}
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// RemoveConsumer 移除消费者
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func (c *client) RemoveConsumer(channel, id string) {
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c.Lock()
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c.Unlock()
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for i, ch := range c.channelConsumers[channel] {
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if ch.Id == id {
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if len(c.channelConsumers[channel]) <= 1 {
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delete(c.channelConsumers, channel)
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// 用空字符清理一下start中的ReadChan()管道
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c.diskQueue.Put([]byte(""))
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} else {
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c.channelConsumers[channel] = append(c.channelConsumers[channel][:i], c.channelConsumers[channel][i+1:]...)
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}
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}
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}
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}
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// 将消息MQMessage转换为[]byte
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func (c *client) messageToByte(m *model.MQMessage, w io.Writer) (int64, error) {
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var buf [10]byte
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var total int64
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binary.BigEndian.PutUint64(buf[:8], uint64(m.Timestamp))
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binary.BigEndian.PutUint16(buf[8:10], uint16(m.Attempts))
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n, err := w.Write(buf[:])
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total += int64(n)
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if err != nil {
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return total, err
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}
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n, err = w.Write(m.ID[:])
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total += int64(n)
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if err != nil {
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return total, err
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}
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n, err = w.Write(m.Body)
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total += int64(n)
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if err != nil {
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return total, err
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}
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return total, nil
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}
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// Publish 生产者调用此方法进行消息发布
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func (c *client) Publish(body []byte) error {
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var id model.MessageID
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copy(id[:], grand.B(16))
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m := c.newMessage(id, body)
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var b bytes.Buffer
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total, err := c.messageToByte(m, &b)
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if err != nil {
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return err
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}
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if total == 0 {
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return errors.New("发布信息失败，s.WriteTo 长度为 0")
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}
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return c.diskQueue.Put(b.Bytes())
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}
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// start 开始投递消息给消费者
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func (c *client) start() {
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for {
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if len(c.channelConsumers) > 0 {
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select {
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case m := <-c.diskQueue.ReadChan():
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if len(m) <= 0 {
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break
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}
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message, err := c.decodeMessage(m)
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if err != nil {
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c.logger(disk.ERROR, err.Error())
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}
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// 消息广播到所有频道
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for _, channel := range c.channelConsumers {
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// 广播到当前频道下的所有消费者
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for _, ch := range channel {
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err = ch.Handler(message)
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if err != nil {
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c.logger(disk.ERROR, err.Error())
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}
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}
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}
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case <-c.exitChan:
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return
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}
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}
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}
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}
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// 解码消息
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// message format:
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//
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// [x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x][x]...
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// | (int64) || || (hex string encoded in ASCII) || (binary)
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// | 8-byte || || 16-byte || N-byte
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// ------------------------------------------------------------------------------------------...
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// nanosecond timestamp ^^ message ID message body
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// (uint16)
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// 2-byte
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// attempts
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func (c *client) decodeMessage(b []byte) (*model.MQMessage, error) {
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var msg model.MQMessage
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if len(b) < 10+consts.MsgIdLength {
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return nil, errors.New("not enough data to decode valid message")
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}
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msg.Timestamp = int64(binary.BigEndian.Uint64(b[:8]))
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msg.Attempts = binary.BigEndian.Uint16(b[8:10])
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copy(msg.ID[:], b[10:10+consts.MsgIdLength])
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msg.Body = b[10+consts.MsgIdLength:]
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return &msg, nil
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}
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// newMessage 创建消息
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func (c *client) newMessage(id model.MessageID, body []byte) *model.MQMessage {
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return &model.MQMessage{
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ID: id,
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Body: body,
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Timestamp: time.Now().UnixNano(),
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}
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}
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func CloseDiskQueueService() {
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for _, v := range clientMap {
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v.diskQueue.Close()
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v.exitChan <- struct{}{}
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}
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}
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// Clear 清空所有磁盘文件，慎用
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func Clear() {
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path := g.Cfg().MustGet(context.TODO(), "mqueue.diskQueue.dataPath").String()
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err := os.RemoveAll(path)
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if err != nil {
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fmt.Println(err)
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}
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}
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