Merge pull request #127 from 9seconds/close-connections

Implement connection TTLs for multiplexing

hub/connection.go

 	"fmt"
 	"math/rand"
 	"sync"
+	"time"
 
 	"go.uber.org/zap"
 
 	"github.com/9seconds/mtg/protocol"
 )
 
+const connectionTTL = time.Hour
+
 type connection struct {
 	conn            conntypes.PacketReadWriteCloser
 	proxyConns      map[string]*ProxyConn
 func (c *connection) run() {
 	defer c.Close()
 
+	ttl := time.NewTimer(connectionTTL)
+	defer ttl.Stop()
+
 	for {
 		select {
 		case <-c.channelDone:
 			}
 
 			return
+		case <-ttl.C:
+			c.logger.Debugw("Closing connection by TTL")
+			c.Close()
 		case resp := <-c.channelRead:
 			if channel, ok := c.proxyConns[string(resp.ConnID[:])]; ok {
 				if resp.Type == rpc.ProxyResponseTypeCloseExt {