[skip-changelog] refactor: Made command functions to access Package…

…Manager unavailable from public API (#2335)

* Let instance commands require an *rpc.Instance

Removed the shorthand of the InstanceCommand interface.
This makes the API more coherent among the `commands` instance handling.

* Moved 'command' package's instances functions inside internal package

This change highlights the incorrect PackageManager access in 'cli'
package. Now those are errors:

package github.com/arduino/arduino-cli
	imports github.com/arduino/arduino-cli/internal/cli
	imports github.com/arduino/arduino-cli/internal/cli/board
	imports github.com/arduino/arduino-cli/internal/cli/arguments
	internal/cli/arguments/completion.go:23:2: use of internal package github.com/arduino/arduino-cli/commands/internal/instances not allowed
package github.com/arduino/arduino-cli
	imports github.com/arduino/arduino-cli/internal/cli
	imports github.com/arduino/arduino-cli/internal/cli/board
	imports github.com/arduino/arduino-cli/internal/cli/arguments
	internal/cli/arguments/port.go:24:2: use of internal package github.com/arduino/arduino-cli/commands/internal/instances not allowed

* Made CoreInstance private

* Inlined coreInstancesContainer singleton methods

* Removed all wrong accesses to package Explorer

* Replaced DiscoveryManager.Watch with equivalent gRPC BoardListWatch call

* Replaced direct access to PackageManager to get discovery protocols

Previously the function GetConnectedBoards() counter-intuitively
returned a list of port address. Now it has been reneamed
GetAvailablePorts() and returns the full Port object that is mapped into
an array of Addresses or into an array of Prorocols based on the
auto-completion request.

commands/board/details.go

@@ -21,14 +21,14 @@ import (
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/arduino/utils"
-	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
 // Details returns all details for a board including tools and HW identifiers.
 // This command basically gather al the information and translates it into the required grpc struct properties
 func Details(ctx context.Context, req *rpc.BoardDetailsRequest) (*rpc.BoardDetailsResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/board/list.go

@@ -31,7 +31,7 @@ import (
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
 	"github.com/arduino/arduino-cli/arduino/discovery"
 	"github.com/arduino/arduino-cli/arduino/httpclient"
-	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	"github.com/arduino/arduino-cli/internal/inventory"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 	"github.com/arduino/go-properties-orderedmap"
@@ -203,7 +203,7 @@ func identify(pme *packagemanager.Explorer, port *discovery.Port) ([]*rpc.BoardL
 // In case of errors partial results from discoveries that didn't fail
 // are returned.
 func List(req *rpc.BoardListRequest) (r []*rpc.DetectedPort, discoveryStartErrors []error, e error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, nil, &arduino.InvalidInstanceError{}
 	}
@@ -258,7 +258,7 @@ func hasMatchingBoard(b *rpc.DetectedPort, fqbnFilter *cores.FQBN) bool {
 
 // Watch returns a channel that receives boards connection and disconnection events.
 func Watch(ctx context.Context, req *rpc.BoardListWatchRequest) (<-chan *rpc.BoardListWatchResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/board/listall.go

@@ -23,13 +23,13 @@ import (
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/arduino/utils"
-	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
 // ListAll FIXMEDOC
 func ListAll(ctx context.Context, req *rpc.BoardListAllRequest) (*rpc.BoardListAllResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/board/search.go

@@ -22,7 +22,7 @@ import (
 
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/utils"
-	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
@@ -31,7 +31,7 @@ import (
 // installed. Note that platforms that are not installed don't include boards' FQBNs.
 // If no search argument is used all boards are returned.
 func Search(ctx context.Context, req *rpc.BoardSearchRequest) (*rpc.BoardSearchResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/compile/compile.go

@@ -30,7 +30,7 @@ import (
 	"github.com/arduino/arduino-cli/arduino/sketch"
 	"github.com/arduino/arduino-cli/arduino/utils"
 	"github.com/arduino/arduino-cli/buildcache"
-	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	"github.com/arduino/arduino-cli/configuration"
 	"github.com/arduino/arduino-cli/i18n"
 	"github.com/arduino/arduino-cli/internal/inventory"
@@ -57,13 +57,13 @@ func Compile(ctx context.Context, req *rpc.CompileRequest, outStream, errStream
 		exportBinaries = reqExportBinaries.Value
 	}
 
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}
 	defer release()
 
-	lm := commands.GetLibraryManager(req)
+	lm := instances.GetLibraryManager(req.GetInstance())
 	if lm == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/core/download.go

@@ -21,6 +21,7 @@ import (
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
 	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	"github.com/arduino/arduino-cli/i18n"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
@@ -29,7 +30,7 @@ var tr = i18n.Tr
 
 // PlatformDownload FIXMEDOC
 func PlatformDownload(ctx context.Context, req *rpc.PlatformDownloadRequest, downloadCB rpc.DownloadProgressCB) (*rpc.PlatformDownloadResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/core/install.go

@@ -22,13 +22,14 @@ import (
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
 	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
 // PlatformInstall FIXMEDOC
 func PlatformInstall(ctx context.Context, req *rpc.PlatformInstallRequest, downloadCB rpc.DownloadProgressCB, taskCB rpc.TaskProgressCB) (*rpc.PlatformInstallResponse, error) {
 	install := func() error {
-		pme, release := commands.GetPackageManagerExplorer(req)
+		pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 		if pme == nil {
 			return &arduino.InvalidInstanceError{}
 		}

commands/core/list.go

@@ -22,13 +22,14 @@ import (
 
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
 // PlatformList returns a list of installed platforms, optionally filtered by
 // those requiring an update.
 func PlatformList(req *rpc.PlatformListRequest) (*rpc.PlatformListResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/core/search.go

@@ -24,12 +24,13 @@ import (
 	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/arduino/utils"
 	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
 // PlatformSearch FIXMEDOC
 func PlatformSearch(req *rpc.PlatformSearchRequest) (*rpc.PlatformSearchResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/core/uninstall.go

@@ -21,6 +21,7 @@ import (
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
 	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
@@ -37,7 +38,7 @@ func PlatformUninstall(ctx context.Context, req *rpc.PlatformUninstallRequest, t
 
 // platformUninstall is the implementation of platform unistaller
 func platformUninstall(ctx context.Context, req *rpc.PlatformUninstallRequest, taskCB rpc.TaskProgressCB) error {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return &arduino.InvalidInstanceError{}
 	}

commands/core/upgrade.go

@@ -18,18 +18,18 @@ package core
 import (
 	"context"
 
-	"github.com/arduino/arduino-cli/arduino/cores"
-
 	"github.com/arduino/arduino-cli/arduino"
+	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
 	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 )
 
 // PlatformUpgrade FIXMEDOC
 func PlatformUpgrade(ctx context.Context, req *rpc.PlatformUpgradeRequest, downloadCB rpc.DownloadProgressCB, taskCB rpc.TaskProgressCB) (*rpc.PlatformUpgradeResponse, error) {
 	upgrade := func() (*cores.PlatformRelease, error) {
-		pme, release := commands.GetPackageManagerExplorer(req)
+		pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 		if pme == nil {
 			return nil, &arduino.InvalidInstanceError{}
 		}

commands/debug/debug.go

@@ -26,7 +26,7 @@ import (
 
 	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
-	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	"github.com/arduino/arduino-cli/executils"
 	"github.com/arduino/arduino-cli/i18n"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
@@ -45,7 +45,7 @@ var tr = i18n.Tr
 func Debug(ctx context.Context, req *rpc.GetDebugConfigRequest, inStream io.Reader, out io.Writer, interrupt <-chan os.Signal) (*rpc.DebugResponse, error) {
 
 	// Get debugging command line to run debugger
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}

commands/debug/debug_info.go

@@ -25,7 +25,7 @@ import (
 	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
 	"github.com/arduino/arduino-cli/arduino/sketch"
-	"github.com/arduino/arduino-cli/commands"
+	"github.com/arduino/arduino-cli/commands/internal/instances"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 	"github.com/arduino/go-paths-helper"
 	"github.com/arduino/go-properties-orderedmap"
@@ -35,7 +35,7 @@ import (
 
 // GetDebugConfig returns metadata to start debugging with the specified board
 func GetDebugConfig(ctx context.Context, req *rpc.GetDebugConfigRequest) (*rpc.GetDebugConfigResponse, error) {
-	pme, release := commands.GetPackageManagerExplorer(req)
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
 	if pme == nil {
 		return nil, &arduino.InvalidInstanceError{}
 	}