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tcp_server.go
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tcp_server.go
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package tcp
import (
"boshhmforwarder/logging"
"bufio"
"fmt"
"net"
"time"
)
type messageStatistics struct {
TotalMessagesReceived int
DeltaMessagesReceived int
}
func Open(port int, dataCh chan<- string) error {
// listen on all interfaces
if isPortOccupied(port) {
return fmt.Errorf("The configured port %d is in use", port)
}
var msgStats = new(messageStatistics)
ln, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
return err
}
receiveChan := make(chan interface{}, 1)
ticker := time.NewTicker(time.Second * 30)
defer ticker.Stop()
go func() {
for {
select {
case <-receiveChan:
msgStats.DeltaMessagesReceived++
msgStats.TotalMessagesReceived++
case <-ticker.C:
logging.Log.Info(fmt.Sprintf("Total Messages Received: %d, Recent Messages Received: %d", msgStats.TotalMessagesReceived, msgStats.DeltaMessagesReceived))
msgStats.DeltaMessagesReceived = 0
}
}
}()
for {
// accept connection on port
conn, err := ln.Accept()
if err != nil {
return err
}
go read(conn, dataCh, receiveChan)
}
}
func read(conn net.Conn, dataCh chan<- string, receiveChan chan interface{}) {
defer conn.Close()
scanner := bufio.NewScanner(conn)
for scanner.Scan() {
message := scanner.Text()
logging.Log.Debugf("Received message on TCP port: %s", message)
dataCh <- message
receiveChan <- true
}
}
func isPortOccupied(port int) bool {
ln, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", port))
if ln != nil {
ln.Close()
}
return err != nil
}