Initial copy in

hooks.go

@@ -0,0 +1,84 @@
+package event
+
+import (
+	"context"
+	"runtime/debug"
+	"runtime/metrics"
+	"strings"
+	"syscall"
+	"time"
+	"unicode"
+)
+
+func HookBuildInfo(_ context.Context, ev *Event) {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		panic("ReadBuildInfo() failed")
+	}
+
+	ev.Set(
+		"goVersion", buildInfo.GoVersion,
+		"goPackagePath", buildInfo.Path,
+		"goMainModuleVersion", buildInfo.Main.Version,
+	)
+}
+
+func HookMetrics(_ context.Context, ev *Event) {
+	descs := metrics.All()
+
+	samples := make([]metrics.Sample, len(descs))
+	for i := range samples {
+		samples[i].Name = descs[i].Name
+	}
+
+	metrics.Read(samples)
+
+	for _, sample := range samples {
+		name := convertMetricName(sample.Name)
+
+		switch sample.Value.Kind() { //nolint:exhaustive
+		case metrics.KindUint64:
+			ev.Set(name, sample.Value.Uint64())
+		case metrics.KindFloat64:
+			ev.Set(name, sample.Value.Float64())
+		}
+	}
+}
+
+func HookRUsage(_ context.Context, ev *Event) {
+	rusage := &syscall.Rusage{}
+
+	err := syscall.Getrusage(syscall.RUSAGE_SELF, rusage)
+	if err != nil {
+		panic(err)
+	}
+
+	ev.Set(
+		"rUsageUTime", time.Duration(rusage.Utime.Nano()).Seconds(),
+		"rUsageSTime", time.Duration(rusage.Stime.Nano()).Seconds(),
+	)
+}
+
+func convertMetricName(in string) string {
+	upperNext := false
+
+	in = strings.TrimLeft(in, "/")
+
+	ret := strings.Builder{}
+
+	for _, r := range in {
+		if !unicode.IsLetter(r) && !unicode.IsDigit(r) {
+			upperNext = true
+			continue
+		}
+
+		if upperNext {
+			r = unicode.ToUpper(r)
+			upperNext = false
+		}
+
+		ret.WriteRune(r)
+	}
+
+	return ret.String()
+}