added generic monitor type and its serial impl

Author: masci

Diff for: arduino/monitors/serial.go

@@ -0,0 +1,53 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2019 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to modify or
+// otherwise use the software for commercial activities involving the Arduino
+// software without disclosing the source code of your own applications. To purchase
+// a commercial license, send an email to [email protected].
+
+package monitors
+
+import (
+	"github.com/pkg/errors"
+	serial "go.bug.st/serial.v1"
+)
+
+// SerialMonitor is a monitor for serial ports
+type SerialMonitor struct {
+	port serial.Port
+}
+
+// OpenSerialMonitor creates a monitor instance for a serial port
+func OpenSerialMonitor(portName string, baudRate int) (*SerialMonitor, error) {
+	port, err := serial.Open(portName, &serial.Mode{BaudRate: baudRate})
+	if err != nil {
+		return nil, errors.Wrap(err, "error opening serial monitor")
+	}
+
+	return &SerialMonitor{
+		port: port,
+	}, nil
+}
+
+// Close the connection
+func (mon *SerialMonitor) Close() error {
+	return mon.port.Close()
+}
+
+// Read bytes from the port
+func (mon *SerialMonitor) Read(bytes []byte) (int, error) {
+	return mon.port.Read(bytes)
+}
+
+// Write bytes to the port
+func (mon *SerialMonitor) Write(bytes []byte) (int, error) {
+	return mon.port.Write(bytes)
+}

Diff for: arduino/monitors/types.go

@@ -0,0 +1,23 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2019 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to modify or
+// otherwise use the software for commercial activities involving the Arduino
+// software without disclosing the source code of your own applications. To purchase
+// a commercial license, send an email to [email protected].
+
+package monitors
+
+// Monitor is the interface implemented by different device monitors
+type Monitor interface {
+	Close() error
+	Read(bytes []byte) (int, error)
+	Write(bytes []byte) (int, error)
+}