Rearrange etw packages

pkg/etw/sample/sample.go

@@ -0,0 +1,53 @@
+// Shows a sample usage of the ETW logging package.
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"github.com/Microsoft/go-winio/pkg/etw"
+	"github.com/sirupsen/logrus"
+
+	"golang.org/x/sys/windows"
+)
+
+func callback(sourceID *windows.GUID, state etw.ProviderState, level etw.Level, matchAnyKeyword uint64, matchAllKeyword uint64, filterData uintptr) {
+	fmt.Printf("Callback: isEnabled=%d, level=%d, matchAnyKeyword=%d\n", state, level, matchAnyKeyword)
+}
+
+func main() {
+	providerID := windows.GUID{0xdd2062c6, 0x5d1b, 0x4a0f, [8]uint8{0xbd, 0xb9, 0x22, 0x28, 0xbc, 0xb1, 0x07, 0x7c}}
+
+	provider, err := etw.NewProvider("TestProvider", &providerID, callback)
+	if err != nil {
+		logrus.Error(err)
+		return
+	}
+	defer func() {
+		if err := provider.Close(); err != nil {
+			logrus.Error(err)
+		}
+	}()
+
+	reader := bufio.NewReader(os.Stdin)
+
+	fmt.Println("Press enter to log an event")
+	reader.ReadString('\n')
+
+	event := etw.NewEvent("TestEvent", etw.NewEventDescriptor())
+	event.Metadata.AddField("TestField", etw.InTypeAnsiString)
+	event.Data.AddString("Foo")
+	event.Metadata.AddField("TestField2", etw.InTypeAnsiString)
+	event.Data.AddString("Bar")
+
+	if err := provider.WriteEvent(event); err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println("Event written")
+
+	fmt.Println("Press enter to exit")
+	reader.ReadString('\n')
+}