mi: replace all WMI calls with MI calls (#1714)

internal/mi/mi_bench_test.go

@@ -0,0 +1,43 @@
+//go:build windows
+
+package mi_test
+
+import (
+	"testing"
+
+	"github.com/prometheus-community/windows_exporter/internal/mi"
+	"github.com/stretchr/testify/require"
+)
+
+func Benchmark_MI_Query_Unmarshal(b *testing.B) {
+	application, err := mi.Application_Initialize()
+	require.NoError(b, err)
+	require.NotEmpty(b, application)
+
+	session, err := application.NewSession(nil)
+	require.NoError(b, err)
+	require.NotEmpty(b, session)
+
+	b.ResetTimer()
+
+	var processes []win32Process
+
+	query, err := mi.NewQuery("SELECT Name FROM Win32_Process WHERE Handle = 0 OR Handle = 4")
+	require.NoError(b, err)
+
+	for i := 0; i < b.N; i++ {
+		err := session.QueryUnmarshal(&processes, mi.OperationFlagsStandardRTTI, nil, mi.NamespaceRootCIMv2, mi.QueryDialectWQL, query)
+		require.NoError(b, err)
+		require.Equal(b, []win32Process{{Name: "System Idle Process"}, {Name: "System"}}, processes)
+	}
+
+	b.StopTimer()
+
+	err = session.Close()
+	require.NoError(b, err)
+
+	err = application.Close()
+	require.NoError(b, err)
+
+	b.ReportAllocs()
+}