Implement cli commander (#17)

arduino-cli packages have been imported in order to directly call the arduino-cli commands packages.
This allows to remove arduino-cli daemon as a requisite.
Moreover, this completely remove the needs to have arduino-cli installed.
Compile is not required at the moment

* Remove compile from commander interface

* Implement cli commander

* Update readme

Author: polldo

Diff for: README.md

@@ -6,7 +6,6 @@ iot-cloud-cli is a command line interface that allows to exploit the features of
 
 This is all you need to use iot-cloud-cli for device **provisioning**:
  * A client ID and a secret ID, retrievable from the [cloud](https://create.arduino.cc/iot/integrations) by creating a new API key
- * arduino-cli in daemon mode, to start it use the command 'arduino-cli daemon'
  * The folder containing the precompiled provisioning firmwares (`binaries`) needs to be in the same location you run the command from
 
 This is all you need to use iot-cloud-cli as a **virtual device**:

Diff for: arduino/cli/commander.go

@@ -0,0 +1,71 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/arduino/arduino-cli/cli/instance"
+	"github.com/arduino/arduino-cli/commands/board"
+	"github.com/arduino/arduino-cli/commands/upload"
+	"github.com/arduino/arduino-cli/configuration"
+	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
+	"github.com/arduino/iot-cloud-cli/arduino"
+	"github.com/sirupsen/logrus"
+)
+
+type commander struct {
+	*rpc.Instance
+}
+
+// NewCommander instantiates and returns a new arduino-cli commander that allows to
+// programmatically call arduino-cli commands.
+// It directly imports the golang packages of the arduino-cli.
+func NewCommander() (arduino.Commander, error) {
+	// Discard arduino-cli log messages
+	logrus.SetOutput(ioutil.Discard)
+	// Initialize arduino-cli configuration
+	configuration.Settings = configuration.Init(configuration.FindConfigFileInArgsOrWorkingDirectory(os.Args))
+	// Create arduino-cli instance, needed to execute arduino-cli commands
+	inst, err := instance.CreateInstance()
+	if err != nil {
+		err = fmt.Errorf("%s: %w", "creating arduino-cli instance", err)
+		return nil, err
+	}
+
+	cmd := &commander{inst}
+	return cmd, nil
+}
+
+// BoardList executes the 'arduino-cli board list' command
+// and returns its result.
+func (c *commander) BoardList() ([]*rpc.DetectedPort, error) {
+	ports, err := board.List(c.GetId())
+	if err != nil {
+		err = fmt.Errorf("%s: %w", "detecting boards", err)
+		return nil, err
+	}
+	return ports, nil
+}
+
+// UploadBin executes the 'arduino-cli upload -i' command
+// and returns its result.
+func (c *commander) UploadBin(fqbn, bin, port string) error {
+	req := &rpc.UploadRequest{
+		Instance:   c.Instance,
+		Fqbn:       fqbn,
+		SketchPath: filepath.Dir(bin),
+		ImportFile: bin,
+		Port:       port,
+		Verbose:    false,
+	}
+
+	if _, err := upload.Upload(context.Background(), req, os.Stdout, os.Stderr); err != nil {
+		err = fmt.Errorf("%s: %w", "uploading binary", err)
+		return err
+	}
+
+	return nil
+}

Diff for: arduino/commander.go

@@ -8,6 +8,6 @@ import (
 // the arduino-cli commands in a programmatic way
 type Commander interface {
 	BoardList() ([]*rpc.DetectedPort, error)
-	UploadBin(fqbn, path, port string) error
-	Compile() error
+	UploadBin(fqbn, bin, port string) error
+	//Compile() error
 }

Diff for: command/device/create.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
-	"github.com/arduino/iot-cloud-cli/arduino/grpc"
+	"github.com/arduino/iot-cloud-cli/arduino/cli"
 	"github.com/arduino/iot-cloud-cli/internal/config"
 	"github.com/arduino/iot-cloud-cli/internal/iot"
 )
@@ -31,13 +31,12 @@ type device struct {
 // Create command is used to provision a new arduino device
 // and to add it to the arduino iot cloud.
 func Create(params *CreateParams) (string, error) {
-	rpcComm, rpcClose, err := grpc.NewClient()
+	comm, err := cli.NewCommander()
 	if err != nil {
 		return "", err
 	}
-	defer rpcClose()
 
-	ports, err := rpcComm.BoardList()
+	ports, err := comm.BoardList()
 	if err != nil {
 		return "", err
 	}
@@ -63,7 +62,7 @@ func Create(params *CreateParams) (string, error) {
 	}
 
 	prov := &provision{
-		Commander: rpcComm,
+		Commander: comm,
 		Client:    iotClient,
 		dev:       dev,
 		id:        devID}