terminal_services: refactor collector (#1729)

internal/mi/callbacks.go

@@ -5,8 +5,10 @@ package mi
 import (
 	"errors"
 	"fmt"
+	"math"
 	"reflect"
 	"sync"
+	"time"
 	"unsafe"
 
 	"golang.org/x/sys/windows"
@@ -14,6 +16,10 @@ import (
 
 // We have to registry a global callback function, since the amount of callbacks is limited.
 var operationUnmarshalCallbacksInstanceResult = sync.OnceValue[uintptr](func() uintptr {
+	// Workaround for a deadlock issue in go.
+	// Ref: https://github.com/golang/go/issues/55015
+	go time.Sleep(time.Duration(math.MaxInt64))
+
 	return windows.NewCallback(func(
 		operation *Operation,
 		callbacks *OperationUnmarshalCallbacks,

internal/mi/session.go

@@ -212,9 +212,16 @@ func (s *Session) QueryUnmarshal(dst any,
 
 	errs := make([]error, 0)
 
-	for err := range errCh {
-		if err != nil {
+	// We need an active go routine to prevent a
+	// fatal error: all goroutines are asleep - deadlock!
+	// ref: https://github.com/golang/go/issues/55015
+	// go time.Sleep(5 * time.Second)
+
+	for {
+		if err, ok := <-errCh; err != nil {
 			errs = append(errs, err)
+		} else if !ok {
+			break
 		}
 	}