2019-04-18 16:38:24 +01:00
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package yggdrasil
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import (
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"errors"
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2019-04-21 12:28:46 +01:00
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
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"github.com/yggdrasil-network/yggdrasil-go/src/util"
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2019-04-18 16:38:24 +01:00
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)
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2019-04-18 23:38:23 +01:00
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type Conn struct {
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core *Core
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nodeID *crypto.NodeID
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nodeMask *crypto.NodeID
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recv chan *wire_trafficPacket // Eventually gets attached to session.recv
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mutex *sync.RWMutex
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session *sessionInfo
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readDeadline atomic.Value // time.Time // TODO timer
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writeDeadline atomic.Value // time.Time // TODO timer
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expired atomic.Value // bool
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searching atomic.Value // bool
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}
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func (c *Conn) String() string {
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return fmt.Sprintf("conn=%p", c)
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}
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// This method should only be called from the router goroutine
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func (c *Conn) startSearch() {
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searchCompleted := func(sinfo *sessionInfo, err error) {
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c.searching.Store(false)
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c.mutex.Lock()
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defer c.mutex.Unlock()
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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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c.expired.Store(true)
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return
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}
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if sinfo != nil {
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c.core.log.Debugln(c.String(), "DHT search completed")
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c.session = sinfo
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c.nodeID, c.nodeMask = sinfo.theirAddr.GetNodeIDandMask()
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c.expired.Store(false)
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} else {
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c.core.log.Debugln(c.String(), "DHT search failed: no session returned")
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c.expired.Store(true)
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return
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}
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}
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doSearch := func() {
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c.searching.Store(true)
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sinfo, isIn := c.core.searches.searches[*c.nodeID]
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if !isIn {
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sinfo = c.core.searches.newIterSearch(c.nodeID, c.nodeMask, searchCompleted)
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c.core.log.Debugf("%s DHT search started: %p", c.String(), sinfo)
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}
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c.core.searches.continueSearch(sinfo)
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}
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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 c.session == nil {
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doSearch()
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} else {
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sinfo.worker <- func() {
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switch {
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case !sinfo.init:
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doSearch()
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case time.Since(sinfo.time) > 6*time.Second:
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if sinfo.time.Before(sinfo.pingTime) && time.Since(sinfo.pingTime) > 6*time.Second {
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// TODO double check that the above condition is correct
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doSearch()
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} else {
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c.core.sessions.ping(sinfo)
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}
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default: // Don't do anything, to keep traffic throttled
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}
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}
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}
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}
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func (c *Conn) Read(b []byte) (int, error) {
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// If the session is marked as expired then do nothing at this point
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if e, ok := c.expired.Load().(bool); ok && e {
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return 0, errors.New("session is closed")
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}
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// Take a copy of the session object
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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 the session is not initialised, do nothing. Currently in this instance
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// in a write, we would trigger a new session, but it doesn't make sense for
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// us to block forever here if the session will not reopen.
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// TODO: should this return an error or just a zero-length buffer?
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if !sinfo.init {
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return 0, errors.New("session is closed")
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}
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// Wait for some traffic to come through from the session
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select {
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// TODO...
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case p, ok := <-c.recv:
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// If the channel was closed then mark the connection as expired, this will
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// mean that the next write will start a new search and reopen the session
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if !ok {
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c.expired.Store(true)
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return 0, errors.New("session is closed")
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}
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defer util.PutBytes(p.Payload)
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var err error
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// Hand over to the session worker
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sinfo.doWorker(func() {
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// If the nonce is bad then drop the packet and return an error
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if !sinfo.nonceIsOK(&p.Nonce) {
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err = errors.New("packet dropped due to invalid nonce")
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return
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}
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// Decrypt the packet
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bs, isOK := crypto.BoxOpen(&sinfo.sharedSesKey, p.Payload, &p.Nonce)
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// Check if we were unable to decrypt the packet for some reason and
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// return an error if we couldn't
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if !isOK {
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util.PutBytes(bs)
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err = errors.New("packet dropped due to decryption failure")
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return
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}
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// Return the newly decrypted buffer back to the slice we were given
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copy(b, bs)
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// Trim the slice down to size based on the data we received
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if len(bs) < len(b) {
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b = b[:len(bs)]
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}
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// Update the session
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sinfo.updateNonce(&p.Nonce)
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sinfo.time = time.Now()
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sinfo.bytesRecvd += uint64(len(b))
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})
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// Something went wrong in the session worker so abort
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if err != nil {
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return 0, err
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}
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// If we've reached this point then everything went to plan, return the
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// number of bytes we populated back into the given slice
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return len(b), nil
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//case <-c.recvTimeout:
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//case <-c.session.closed:
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// c.expired = true
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// return len(b), errors.New("session is closed")
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}
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}
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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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// Check whether the connection is expired, if it is we can start a new
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// search to revive it
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expired, eok := c.expired.Load().(bool)
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// If the session doesn't exist, or isn't initialised (which probably means
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// that the session was never set up or it closed by timeout), or the conn
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// is marked as expired, then see if we can start a new search
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if sinfo == nil || !sinfo.init || (eok && expired) {
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// Is a search already taking place?
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if searching, sok := c.searching.Load().(bool); !sok || (sok && !searching) {
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// No search was already taking place so start a new one
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c.core.router.doAdmin(func() {
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c.startSearch()
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})
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return 0, errors.New("starting search")
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}
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// A search is already taking place so wait for it to finish
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return 0, errors.New("waiting for search to complete")
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}
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//defer util.PutBytes(b)
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var packet []byte
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// Hand over to the session worker
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sinfo.doWorker(func() {
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// Encrypt the packet
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payload, nonce := crypto.BoxSeal(&sinfo.sharedSesKey, b, &sinfo.myNonce)
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defer util.PutBytes(payload)
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// Construct the wire packet to send to the router
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p := wire_trafficPacket{
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Coords: sinfo.coords,
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Handle: sinfo.theirHandle,
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Nonce: *nonce,
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Payload: payload,
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}
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packet = p.encode()
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sinfo.bytesSent += uint64(len(b))
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})
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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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return len(b), nil
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}
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func (c *Conn) Close() error {
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// Mark the connection as expired, so that a future read attempt will fail
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// and a future write attempt will start a new search
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c.expired.Store(true)
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// Close the session, if it hasn't been closed already
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c.session.close()
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// This can't fail yet - TODO?
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return nil
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}
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func (c *Conn) LocalAddr() crypto.NodeID {
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return *crypto.GetNodeID(&c.session.core.boxPub)
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}
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func (c *Conn) RemoteAddr() crypto.NodeID {
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c.mutex.RLock()
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defer c.mutex.RUnlock()
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return *c.nodeID
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}
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func (c *Conn) SetDeadline(t time.Time) error {
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c.SetReadDeadline(t)
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c.SetWriteDeadline(t)
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return nil
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}
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func (c *Conn) SetReadDeadline(t time.Time) error {
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c.readDeadline.Store(t)
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return nil
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}
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func (c *Conn) SetWriteDeadline(t time.Time) error {
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c.writeDeadline.Store(t)
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return nil
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}
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