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don't block forever in Write if the session is cancelled, cleanup Conn.Read slightly

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This commit is contained in:
Arceliar 2019-08-04 02:08:47 -05:00
parent 144c823bee
commit 6da5802ae5
1 changed files with 31 additions and 23 deletions
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54
src/yggdrasil/conn.go
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@ -154,29 +154,27 @@ func (c *Conn) Read(b []byte) (int, error) {
sinfo := c.session
cancel := c.getDeadlineCancellation(&c.readDeadline)
defer cancel.Cancel(nil)
for {
// Wait for some traffic to come through from the session
select {
case <-cancel.Finished():
if cancel.Error() == util.CancellationTimeoutError {
return 0, ConnError{errors.New("read timeout"), true, false, false, 0}
} else {
return 0, ConnError{errors.New("session closed"), false, false, true, 0}
}
case bs := <-sinfo.recv:
var err error
n := len(bs)
if len(bs) > len(b) {
n = len(b)
err = ConnError{errors.New("read buffer too small for entire packet"), false, true, false, 0}
}
// Copy results to the output slice and clean up
copy(b, bs)
util.PutBytes(bs)
// If we've reached this point then everything went to plan, return the
// number of bytes we populated back into the given slice
return n, err
// Wait for some traffic to come through from the session
select {
case <-cancel.Finished():
if cancel.Error() == util.CancellationTimeoutError {
return 0, ConnError{errors.New("read timeout"), true, false, false, 0}
} else {
return 0, ConnError{errors.New("session closed"), false, false, true, 0}
}
case bs := <-sinfo.recv:
var err error
n := len(bs)
if len(bs) > len(b) {
n = len(b)
err = ConnError{errors.New("read buffer too small for entire packet"), false, true, false, 0}
}
// Copy results to the output slice and clean up
copy(b, bs)
util.PutBytes(bs)
// If we've reached this point then everything went to plan, return the
// number of bytes we populated back into the given slice
return n, err
}
}
@ -206,7 +204,17 @@ func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
sinfo.doFunc(sessionFunc)
if written > 0 {
bs := append(util.GetBytes(), b...)
sinfo.send <- bs
cancel := c.getDeadlineCancellation(&c.writeDeadline)
defer cancel.Cancel(nil)
select {
case <-cancel.Finished():
if cancel.Error() == util.CancellationTimeoutError {
return 0, ConnError{errors.New("write timeout"), true, false, false, 0}
} else {
return 0, ConnError{errors.New("session closed"), false, false, true, 0}
}
case sinfo.send <- bs:
}
}
return written, err
}