87 lines
1.6 KiB
Go
87 lines
1.6 KiB
Go
package main
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import (
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"fmt"
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"io"
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"log"
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"net"
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"sync"
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"time"
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)
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type PacketWithData struct {
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MessageType uint16
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Added time.Time
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Consumed bool
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Data []byte
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}
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type PacketQueue struct {
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mu sync.RWMutex
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Packets []PacketWithData
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connection net.Conn
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}
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func NewPacketQueue(connection net.Conn) *PacketQueue {
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queue := &PacketQueue{
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Packets: make([]PacketWithData, 0),
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connection: connection,
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}
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go func() {
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defer connection.Close()
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for {
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messageType, data, err := ReceivePacket(queue.connection)
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ts := time.Now()
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if err != nil {
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log.Printf("Error receiving packet: %v\n", err)
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if err == io.EOF {
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return
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}
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//return
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}
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queue.mu.Lock()
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l := make([]PacketWithData, 0, len(queue.Packets))
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for _, packet := range queue.Packets {
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if !packet.Consumed {
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l = append(l, packet)
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}
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}
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queue.Packets = append(l, PacketWithData{
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MessageType: messageType,
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Added: ts,
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Data: data,
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})
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queue.mu.Unlock()
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packetsReceived.Inc()
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packetQueue.Set(float64(len(queue.Packets)))
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}
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}()
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return queue
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}
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func (p *PacketQueue) Expect(messageType uint16, timeToWait time.Duration) (*PacketWithData, error) {
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start := time.Now().Add(-time.Millisecond)
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for {
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if time.Since(start) > timeToWait {
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return nil, fmt.Errorf("timeout waiting for message type %d", messageType)
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}
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p.mu.RLock()
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for _, packet := range p.Packets {
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if packet.MessageType == messageType && packet.Added.After(start) {
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packet.Consumed = true
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p.mu.RUnlock()
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return &packet, nil
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}
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}
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p.mu.RUnlock()
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time.Sleep(time.Millisecond * 2)
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}
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}
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