feat: explanation as observer too

internal/performance/tracker.go

@@ -0,0 +1,46 @@
+package performance
+
+import (
+	"os"
+	"path/filepath"
+	"runtime/pprof"
+)
+
+type Tracker struct {
+	File        string
+	filePointer *os.File
+	Error       error
+}
+
+func Track(file string) *Tracker {
+	return &Tracker{File: file}
+}
+
+func (t *Tracker) Start() {
+	var absPath string
+
+	absPath, t.Error = filepath.Abs(t.File)
+	if t.Error != nil {
+		return
+	}
+
+	t.Error = os.MkdirAll(filepath.Dir(absPath), 0777)
+	if t.Error != nil {
+		return
+	}
+
+	t.filePointer, t.Error = os.Create(absPath)
+	if t.Error != nil {
+		return
+	}
+
+	t.Error = pprof.StartCPUProfile(t.filePointer)
+	if t.Error != nil {
+		return
+	}
+}
+
+func (t *Tracker) End() {
+	pprof.StopCPUProfile()
+	t.filePointer.Close()
+}