func (c *Codec) ReadHeader(hdr *rpc.Header) error {
c.msg = inMsg{} // avoid any potential cross-message contamination.
var err error
if c.isLogging() {
var m json.RawMessage
err = c.conn.Receive(&m)
if err == nil {
logger.Tracef("<- %s", m)
err = json.Unmarshal(m, &c.msg)
} else {
logger.Tracef("<- error: %v (closing %v)", err, c.isClosing())
}
} else {
err = c.conn.Receive(&c.msg)
}
if err != nil {
// If we've closed the connection, we may get a spurious error,
// so ignore it.
if c.isClosing() || err == io.EOF {
return io.EOF
}
return fmt.Errorf("error receiving message: %v", err)
}
hdr.RequestId = c.msg.RequestId
hdr.Request = rpc.Request{
Type: c.msg.Type,
Id: c.msg.Id,
Action: c.msg.Request,
}
hdr.Error = c.msg.Error
hdr.ErrorCode = c.msg.ErrorCode
return nil
}
