103 lines
2.1 KiB
Go
103 lines
2.1 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 CartPacketWithData struct {
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MessageType uint32
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Id CartId
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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 CartPacketQueue struct {
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mu sync.RWMutex
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Packets []CartPacketWithData
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//connection net.Conn
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}
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const cartCap = 150
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func NewCartPacketQueue(connection net.Conn) *CartPacketQueue {
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queue := &CartPacketQueue{
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Packets: make([]CartPacketWithData, 0, cartCap),
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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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var packet CartPacket
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for {
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err := ReadCartPacket(connection, &packet)
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if err != nil {
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if err == io.EOF {
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return
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}
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log.Printf("Error receiving packet: %v\n", err)
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//return
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}
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data, err := GetPacketData(connection, packet.DataLength)
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if err != nil {
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log.Printf("Error receiving packet data: %v\n", err)
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return
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}
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go queue.HandleData(packet.MessageType, packet.Id, data)
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}
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}()
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return queue
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}
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func (p *CartPacketQueue) HandleData(t uint32, id CartId, data []byte) {
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ts := time.Now()
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l := make([]CartPacketWithData, 0, cartCap)
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p.mu.RLock()
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breakAt := ts.Add(-time.Millisecond * 250)
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for _, packet := range p.Packets {
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if !packet.Consumed && packet.Added.After(breakAt) {
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l = append(l, packet)
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if len(l) >= cartCap {
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break
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}
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}
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}
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p.mu.RUnlock()
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p.mu.Lock()
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p.Packets = append([]CartPacketWithData{
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{
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MessageType: t,
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Id: id,
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Added: ts,
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Data: data,
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},
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}, l...)
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p.mu.Unlock()
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}
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func (p *CartPacketQueue) Expect(messageType uint32, id CartId, timeToWait time.Duration) (*CartPacketWithData, 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.Consumed && packet.MessageType == messageType && packet.Id == id && 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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