Implementation of 'monitor' command of the CLI

Author: cmaglie

Diff for: cli/monitor/monitor.go

@@ -17,6 +17,8 @@ package monitor
 
 import (
 	"context"
+	"errors"
+	"io"
 	"os"
 	"sort"
 	"strings"
@@ -78,8 +80,50 @@ func runMonitorCmd(cmd *cobra.Command, args []string) {
 		return
 	}
 
-	feedback.Error("Monitor functionality not yet implemented")
-	os.Exit(errorcodes.ErrGeneric)
+	tty, err := newStdInOutTerminal()
+	if err != nil {
+		feedback.Error(err)
+		os.Exit(errorcodes.ErrGeneric)
+	}
+	defer tty.Close()
+
+	portProxy, descriptor, err := monitor.Monitor(context.Background(), &rpc.MonitorRequest{
+		Instance: instance,
+		Port:     port.ToRPC(),
+		Fqbn:     "",
+	})
+	if err != nil {
+		feedback.Error(err)
+		os.Exit(errorcodes.ErrGeneric)
+	}
+	defer portProxy.Close()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		_, err := io.Copy(tty, portProxy)
+		if err != nil && !errors.Is(err, io.EOF) {
+			feedback.Error(tr("Port closed:"), err)
+		}
+		cancel()
+	}()
+	go func() {
+		_, err := io.Copy(portProxy, tty)
+		if err != nil && !errors.Is(err, io.EOF) {
+			feedback.Error(tr("Port closed:"), err)
+		}
+		cancel()
+	}()
+
+	params := descriptor.ConfigurationParameters
+	paramsKeys := sort.StringSlice{}
+	for k := range params {
+		paramsKeys = append(paramsKeys, k)
+	}
+	sort.Sort(paramsKeys)
+	feedback.Print(tr("Connected to %s! Press CTRL-C to exit.", port.String()))
+
+	// Wait for port closed
+	<-ctx.Done()
 }
 
 type detailsResult struct {

Diff for: cli/monitor/term.go

@@ -0,0 +1,39 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2020 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 monitor
+
+import (
+	"os"
+)
+
+type stdInOut struct {
+}
+
+func newStdInOutTerminal() (*stdInOut, error) {
+	return &stdInOut{}, nil
+}
+
+func (n *stdInOut) Close() error {
+	return nil
+}
+
+func (n *stdInOut) Read(buff []byte) (int, error) {
+	return os.Stdin.Read(buff)
+}
+
+func (n *stdInOut) Write(buff []byte) (int, error) {
+	return os.Stdout.Write(buff)
+}