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https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-26 03:41:37 +00:00
don't spam searches for unused connections. todo: timeout old connections somehow
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parent
70774fc3de
commit
5ea864869a
@ -3,6 +3,7 @@ package tuntap
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import (
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"errors"
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"github.com/yggdrasil-network/yggdrasil-go/src/address"
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"github.com/yggdrasil-network/yggdrasil-go/src/util"
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"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
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)
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@ -10,11 +11,21 @@ import (
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type tunConn struct {
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tun *TunAdapter
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conn *yggdrasil.Conn
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addr address.Address
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snet address.Subnet
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send chan []byte
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stop chan interface{}
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}
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func (s *tunConn) close() {
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s.tun.mutex.Lock()
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s._close_nomutex()
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s.tun.mutex.Unlock()
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}
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func (s *tunConn) _close_nomutex() {
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delete(s.tun.addrToConn, s.addr)
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delete(s.tun.subnetToConn, s.snet)
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close(s.stop)
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}
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@ -32,6 +43,7 @@ func (s *tunConn) reader() error {
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b := make([]byte, 65535)
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for {
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go func() {
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// TODO read timeout and close
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if n, err = s.conn.Read(b); err != nil {
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s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn read error:", err)
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return
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@ -72,6 +84,7 @@ func (s *tunConn) writer() error {
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if !ok {
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return errors.New("send closed")
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}
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// TODO write timeout and close
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if _, err := s.conn.Write(b); err != nil {
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s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn write error:", err)
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}
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@ -236,26 +236,26 @@ func (tun *TunAdapter) wrap(conn *yggdrasil.Conn) (c *tunConn, err error) {
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}
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// Get the remote address and subnet of the other side
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remoteNodeID := conn.RemoteAddr()
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remoteAddr := address.AddrForNodeID(&remoteNodeID)
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remoteSubnet := address.SubnetForNodeID(&remoteNodeID)
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s.addr = *address.AddrForNodeID(&remoteNodeID)
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s.snet = *address.SubnetForNodeID(&remoteNodeID)
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// Work out if this is already a destination we already know about
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tun.mutex.Lock()
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defer tun.mutex.Unlock()
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atc, aok := tun.addrToConn[*remoteAddr]
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stc, sok := tun.subnetToConn[*remoteSubnet]
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atc, aok := tun.addrToConn[s.addr]
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stc, sok := tun.subnetToConn[s.snet]
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// If we know about a connection for this destination already then assume it
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// is no longer valid and close it
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if aok {
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atc.close()
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atc._close_nomutex()
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err = errors.New("replaced connection for address")
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} else if sok {
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stc.close()
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stc._close_nomutex()
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err = errors.New("replaced connection for subnet")
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}
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// Save the session wrapper so that we can look it up quickly next time
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// we receive a packet through the interface for this address
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tun.addrToConn[*remoteAddr] = &s
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tun.subnetToConn[*remoteSubnet] = &s
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tun.addrToConn[s.addr] = &s
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tun.subnetToConn[s.snet] = &s
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// Start the connection goroutines
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go s.reader()
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go s.writer()
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@ -37,6 +37,7 @@ type Conn struct {
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writeDeadline atomic.Value // time.Time // TODO timer
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searching atomic.Value // bool
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searchwait chan struct{} // Never reset this, it's only used for the initial search
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writebuf [][]byte // Packets to be sent if/when the search finishes
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}
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// TODO func NewConn() that initializes additional fields as needed
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@ -60,23 +61,13 @@ func (c *Conn) String() string {
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func (c *Conn) startSearch() {
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// The searchCompleted callback is given to the search
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searchCompleted := func(sinfo *sessionInfo, err error) {
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defer c.searching.Store(false)
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// If the search failed for some reason, e.g. it hit a dead end or timed
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// out, then do nothing
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if err != nil {
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c.core.log.Debugln(c.String(), "DHT search failed:", err)
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go func() {
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time.Sleep(time.Second)
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c.mutex.RLock()
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closed := c.closed
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c.mutex.RUnlock()
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if !closed {
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// Restart the search, or else Write can stay blocked forever
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c.core.router.admin <- c.startSearch
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}
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}()
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return
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}
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defer c.searching.Store(false)
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// Take the connection mutex
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c.mutex.Lock()
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defer c.mutex.Unlock()
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@ -102,6 +93,16 @@ func (c *Conn) startSearch() {
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// Things were closed before the search returned
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// Go ahead and close it again to make sure the session is cleaned up
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go c.Close()
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} else {
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// Send any messages we may have buffered
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var msgs [][]byte
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msgs, c.writebuf = c.writebuf, nil
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go func() {
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for _, msg := range msgs {
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c.Write(msg)
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util.PutBytes(msg)
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}
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}()
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}
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}
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// doSearch will be called below in response to one or more conditions
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@ -238,8 +239,6 @@ func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
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c.mutex.RLock()
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sinfo := c.session
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c.mutex.RUnlock()
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timer := getDeadlineTimer(&c.writeDeadline)
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defer util.TimerStop(timer)
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// If the session doesn't exist, or isn't initialised (which probably means
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// that the search didn't complete successfully) then we may need to wait for
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// the search to complete or start the search again
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@ -249,22 +248,15 @@ func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
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// No search was already taking place so start a new one
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c.core.router.doAdmin(c.startSearch)
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}
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// Wait for the search to complete
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select {
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case <-c.searchwait:
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case <-timer.C:
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return 0, ConnError{errors.New("Timeout"), true, false}
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}
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// Retrieve our session info again
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c.mutex.RLock()
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sinfo = c.session
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c.mutex.RUnlock()
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// If sinfo is still nil at this point then the search failed and the
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// searchwait channel has been recreated, so might as well give up and
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// return an error code
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if sinfo == nil {
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return 0, errors.New("search failed")
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// Buffer the packet to be sent if/when the search is finished
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c.mutex.Lock()
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defer c.mutex.Unlock()
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c.writebuf = append(c.writebuf, append(util.GetBytes(), b...))
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for len(c.writebuf) > 32 {
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util.PutBytes(c.writebuf[0])
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c.writebuf = c.writebuf[1:]
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}
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return len(b), nil
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}
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var packet []byte
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done := make(chan struct{})
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@ -283,13 +275,17 @@ func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
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packet = p.encode()
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sinfo.bytesSent += uint64(len(b))
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}
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// Set up a timer so this doesn't block forever
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timer := getDeadlineTimer(&c.writeDeadline)
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defer util.TimerStop(timer)
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// Hand over to the session worker
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select { // Send to worker
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case sinfo.worker <- workerFunc:
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case <-timer.C:
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return 0, ConnError{errors.New("Timeout"), true, false}
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}
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<-done // Wait for the worker to finish, failing this can cause memory errors (util.[Get||Put]Bytes stuff)
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// Wait for the worker to finish, otherwise there are memory errors ([Get||Put]Bytes stuff)
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<-done
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// Give the packet to the router
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sinfo.core.router.out(packet)
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// Finally return the number of bytes we wrote
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