windows_exporter/internal/mi/instance.go

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//go:build windows
package mi
import (
"errors"
"fmt"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
type Instance struct {
ft *InstanceFT
classDecl *ClassDecl
serverName *uint16
nameSpace *uint16
_ [4]uintptr
}
type InstanceFT struct {
Clone uintptr
Destruct uintptr
Delete uintptr
IsA uintptr
GetClassName uintptr
SetNameSpace uintptr
GetNameSpace uintptr
GetElementCount uintptr
AddElement uintptr
SetElement uintptr
SetElementAt uintptr
GetElement uintptr
GetElementAt uintptr
ClearElement uintptr
ClearElementAt uintptr
GetServerName uintptr
SetServerName uintptr
GetClass uintptr
}
type ClassDecl struct {
Flags uint32
Code uint32
Name *uint16
Mqualifiers uintptr
NumQualifiers uint32
Mproperties uintptr
NumProperties uint32
Size uint32
SuperClass *uint16
SuperClassDecl uintptr
Methods uintptr
NumMethods uint32
Schema uintptr
ProviderFT uintptr
OwningClass uintptr
}
func (instance *Instance) Delete() error {
if instance == nil || instance.ft == nil {
return ErrNotInitialized
}
r0, _, _ := syscall.SyscallN(instance.ft.Delete, uintptr(unsafe.Pointer(instance)))
if result := ResultError(r0); !errors.Is(result, MI_RESULT_OK) {
return result
}
return nil
}
func (instance *Instance) GetElement(elementName string) (*Element, error) {
if instance == nil || instance.ft == nil {
return nil, ErrNotInitialized
}
elementNameUTF16, err := windows.UTF16PtrFromString(elementName)
if err != nil {
return nil, fmt.Errorf("failed to convert element name %s to UTF-16: %w", elementName, err)
}
var (
value uintptr
valueType ValueType
)
r0, _, _ := syscall.SyscallN(
instance.ft.GetElement,
uintptr(unsafe.Pointer(instance)),
uintptr(unsafe.Pointer(elementNameUTF16)),
uintptr(unsafe.Pointer(&value)),
uintptr(unsafe.Pointer(&valueType)),
0,
0,
)
if result := ResultError(r0); !errors.Is(result, MI_RESULT_OK) {
return nil, result
}
return &Element{
value: value,
valueType: valueType,
}, nil
}
func (instance *Instance) GetElementCount() (uint32, error) {
if instance == nil || instance.ft == nil {
return 0, ErrNotInitialized
}
var count uint32
r0, _, _ := syscall.SyscallN(
instance.ft.GetElementCount,
uintptr(unsafe.Pointer(instance)),
uintptr(unsafe.Pointer(&count)),
)
if result := ResultError(r0); !errors.Is(result, MI_RESULT_OK) {
return 0, result
}
return count, nil
}
func (instance *Instance) GetClassName() (string, error) {
if instance == nil || instance.ft == nil {
return "", ErrNotInitialized
}
var classNameUTF16 *uint16
r0, _, _ := syscall.SyscallN(
instance.ft.GetClassName,
uintptr(unsafe.Pointer(instance)),
uintptr(unsafe.Pointer(&classNameUTF16)),
)
if result := ResultError(r0); !errors.Is(result, MI_RESULT_OK) {
return "", result
}
if classNameUTF16 == nil {
return "", errors.New("class name is nil")
}
return windows.UTF16PtrToString(classNameUTF16), nil
}
func Instance_Print(instance *Instance) (string, error) {
elementMap := map[string]any{}
properties := instance.classDecl.Properties()
count, err := instance.GetElementCount()
if err != nil {
return "", err
}
if count == 0 {
return "", nil
}
for _, property := range properties {
name := windows.UTF16PtrToString(property.Name)
element, _ := instance.GetElement(name)
value, _ := element.GetValue()
elementMap[windows.UTF16PtrToString(property.Name)] = value
}
return fmt.Sprintf("%v", elementMap), nil
}