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fix a bug in xbee session locking

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This commit is contained in:
saji 2023-05-03 10:38:22 -05:00
parent 61c0b809d3
commit aa5cd0b393
1 changed files with 10 additions and 10 deletions
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20
internal/xbee/session.go
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@ -145,10 +145,10 @@ func (sess *SerialSession) Write(p []byte) (n int, err error) {
sess.writeLock.Lock()
n, err = writeXBeeFrame(sess.port, wf.Bytes())
sess.writeLock.Unlock()
if err != nil {
return
}
sess.writeLock.Unlock()
// finally, wait for the channel we got to return. this means that
// the matching response frame was received, so we can parse it.
@ -172,7 +172,7 @@ func (sess *SerialSession) Write(p []byte) (n int, err error) {
// instead, an AC command must be set to apply the queued changes. `queued` does not
// affect query-type commands, which always return right away.
// the AT command is an interface.
func (sess *SerialSession) ATCommand(at ATCmd, queued bool) error {
func (sess *SerialSession) ATCommand(cmd [2]rune, data []byte, queued bool) ([]byte, error) {
// we must encode the command, and then create the actual packet.
// then we send the packet, and wait for the response
// TODO: how to handle multiple-response-packet AT commands?
@ -180,19 +180,19 @@ func (sess *SerialSession) ATCommand(at ATCmd, queued bool) error {
// get a mark for the frame
isQuery := len(at.Payload()) > 0
isQuery := len(data) > 0
idx, ch, err := sess.ct.GetMark()
if err != nil {
return err
return nil, err
}
rawData := encodeATCommand(at, idx, queued)
rawData := encodeATCommand(cmd, data, idx, queued)
sess.writeLock.Lock()
_, err = writeXBeeFrame(sess.port, rawData)
sess.writeLock.Unlock()
if err != nil {
return fmt.Errorf("error writing xbee frame: %w", err)
return nil, fmt.Errorf("error writing xbee frame: %w", err)
}
// we use the AT command that was provided to decode the frame.
@ -203,12 +203,12 @@ func (sess *SerialSession) ATCommand(at ATCmd, queued bool) error {
// TODO: add timeout.
resp, err := ParseATCmdResponse(<-ch)
if err != nil {
return err
return nil, err
}
if resp.Status != 0 {
// sinec ATCmdStatus is a stringer thanks to the generator
return fmt.Errorf("AT command failed: %v", resp.Status)
return nil, fmt.Errorf("AT command failed: %v", resp.Status)
}
// finally, we use the provided ATCmd interface to unpack the data.
@ -217,11 +217,11 @@ func (sess *SerialSession) ATCommand(at ATCmd, queued bool) error {
// TODO: skip if not a query command?
if isQuery {
return at.Parse(resp)
return resp.Data, nil
}
// it's not a query, and there was no error, so we just plain return
return nil
return nil, nil
}