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package ttymididrv
import (
"fmt"
"sync"
"github.com/tarm/serial"
)
type out struct {
mu sync.RWMutex
driver *driver
port *serial.Port
name string
baud int
closed bool
number int
}
func (o *out) Open() (err error) {
o.mu.RLock()
if o.closed || o.port != nil {
o.mu.RUnlock()
return nil
}
o.mu.RUnlock()
o.mu.Lock()
defer o.mu.Unlock()
c := &serial.Config{Name: o.name, Baud: o.baud}
o.port, err = serial.OpenPort(c)
if err != nil {
return err
}
o.driver.mu.Lock()
o.driver.opened = append(o.driver.opened, o)
o.driver.mu.Unlock()
return nil
}
func (o *out) Close() error {
o.mu.RLock()
if o.closed || o.port == nil {
o.mu.RUnlock()
return nil
}
o.mu.RUnlock()
o.mu.Lock()
o.closed = true
o.mu.Unlock()
return o.port.Close()
}
func (o *out) IsOpen() bool {
o.mu.RLock()
defer o.mu.RUnlock()
return !o.closed && o.port != nil
}
func (o *out) Number() int {
return o.number
}
func (o *out) String() string {
return o.name
}
func (o *out) Underlying() interface{} {
return o.port
}
func (o *out) Write(b []byte) (int, error) {
_, err := o.port.Write(b)
if err != nil {
return 0, fmt.Errorf("could not write to port: %w", err)
}
return len(b), nil
}
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