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https://github.com/cwinfo/yggdrasil-go.git
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add Conn.ReadNoCopy and Conn.WriteNoCopy that transfer ownership of a slice instead of copying, have Read and Write use the NoCopy versions under the hood and just manage copying as needed
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07f14f92ed
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@ -149,73 +149,90 @@ func (c *Conn) getDeadlineCancellation(value *atomic.Value) util.Cancellation {
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}
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}
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func (c *Conn) Read(b []byte) (int, error) {
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// Take a copy of the session object
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sinfo := c.session
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// Used internally by Read, the caller is responsible for util.PutBytes when they're done.
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func (c *Conn) ReadNoCopy() ([]byte, error) {
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cancel := c.getDeadlineCancellation(&c.readDeadline)
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defer cancel.Cancel(nil)
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// Wait for some traffic to come through from the session
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select {
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case <-cancel.Finished():
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if cancel.Error() == util.CancellationTimeoutError {
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return 0, ConnError{errors.New("read timeout"), true, false, false, 0}
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return nil, ConnError{errors.New("read timeout"), true, false, false, 0}
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} else {
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return 0, ConnError{errors.New("session closed"), false, false, true, 0}
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return nil, ConnError{errors.New("session closed"), false, false, true, 0}
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}
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case bs := <-sinfo.recv:
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var err error
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n := len(bs)
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if len(bs) > len(b) {
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n = len(b)
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err = ConnError{errors.New("read buffer too small for entire packet"), false, true, false, 0}
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}
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// Copy results to the output slice and clean up
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copy(b, bs)
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util.PutBytes(bs)
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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 n, err
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case bs := <-c.session.recv:
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return bs, nil
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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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sinfo := c.session
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written := len(b)
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// Implements net.Conn.Read
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func (c *Conn) Read(b []byte) (int, error) {
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bs, err := c.ReadNoCopy()
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if err != nil {
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return 0, err
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}
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n := len(bs)
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if len(bs) > len(b) {
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n = len(b)
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err = ConnError{errors.New("read buffer too small for entire packet"), false, true, false, 0}
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}
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// Copy results to the output slice and clean up
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copy(b, bs)
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util.PutBytes(bs)
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// Return the number of bytes copied to the slice, along with any error
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return n, err
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}
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// Used internally by Write, the caller must not reuse the argument bytes when no error occurs
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func (c *Conn) WriteNoCopy(bs []byte) error {
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var err error
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sessionFunc := func() {
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// Does the packet exceed the permitted size for the session?
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if uint16(len(b)) > sinfo.getMTU() {
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written, err = 0, ConnError{errors.New("packet too big"), true, false, false, int(sinfo.getMTU())}
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if uint16(len(bs)) > c.session.getMTU() {
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err = ConnError{errors.New("packet too big"), true, false, false, int(c.session.getMTU())}
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return
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}
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// The rest of this work is session keep-alive traffic
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switch {
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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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case time.Since(c.session.time) > 6*time.Second:
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if c.session.time.Before(c.session.pingTime) && time.Since(c.session.pingTime) > 6*time.Second {
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// TODO double check that the above condition is correct
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c.doSearch()
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} else {
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sinfo.core.sessions.ping(sinfo)
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c.core.sessions.ping(c.session)
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}
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case sinfo.reset && sinfo.pingTime.Before(sinfo.time):
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sinfo.core.sessions.ping(sinfo)
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case c.session.reset && c.session.pingTime.Before(c.session.time):
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c.core.sessions.ping(c.session)
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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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sinfo.doFunc(sessionFunc)
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if written > 0 {
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bs := append(util.GetBytes(), b...)
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c.session.doFunc(sessionFunc)
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if err == nil {
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cancel := c.getDeadlineCancellation(&c.writeDeadline)
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defer cancel.Cancel(nil)
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select {
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case <-cancel.Finished():
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if cancel.Error() == util.CancellationTimeoutError {
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return 0, ConnError{errors.New("write timeout"), true, false, false, 0}
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err = ConnError{errors.New("write timeout"), true, false, false, 0}
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} else {
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return 0, ConnError{errors.New("session closed"), false, false, true, 0}
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err = ConnError{errors.New("session closed"), false, false, true, 0}
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}
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case sinfo.send <- bs:
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case c.session.send <- bs:
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}
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}
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return err
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}
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// Implements net.Conn.Write
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func (c *Conn) Write(b []byte) (int, error) {
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written := len(b)
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bs := append(util.GetBytes(), b...)
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err := c.WriteNoCopy(bs)
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if err != nil {
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util.PutBytes(bs)
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written = 0
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}
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return written, err
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}
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