server-go/socket/client-readwriter.go

package socket

import (
	"io"
	"sync"

	olog "git.loafle.net/overflow/log-go"
)

type ClientReadWriter struct {
	ReadwriteHandler ReadWriteHandler
	ReadChan         chan<- SocketMessage
	WriteChan        <-chan SocketMessage
	DisconnectedChan chan<- struct{}
	ReconnectedChan  <-chan Conn
	ClientStopChan   <-chan struct{}
	ClientStopWg     *sync.WaitGroup
}

func (crw *ClientReadWriter) HandleConnection(conn Conn) {

	defer func() {
		if nil != conn {
			conn.Close()
		}
		olog.Logger().Info("disconnected")
		crw.ClientStopWg.Done()
	}()

	olog.Logger().Info("connected")

	var err error

	for {
		if nil != err {
			if IsUnexpectedCloseError(err) || io.EOF == err || io.ErrUnexpectedEOF == err {
				crw.DisconnectedChan <- struct{}{}
				newConn := <-crw.ReconnectedChan
				if nil == newConn {
					return
				}
				conn = newConn
			} else {
				return
			}
		}

		stopChan := make(chan struct{})

		readerDoneChan := make(chan error)
		writerDoneChan := make(chan error)

		go connReadHandler(crw.ReadwriteHandler, conn, stopChan, readerDoneChan, crw.ReadChan)
		go connWriteHandler(crw.ReadwriteHandler, conn, stopChan, writerDoneChan, crw.WriteChan)

		select {
		case err = <-readerDoneChan:
			close(stopChan)
			<-writerDoneChan
		case err = <-writerDoneChan:
			close(stopChan)
			<-readerDoneChan
		case <-crw.ClientStopChan:
			close(stopChan)
			<-readerDoneChan
			<-writerDoneChan
			return
		}
	}
}