refactor: fork boomer as sub module

internal/boomer/utils.go

@@ -0,0 +1,76 @@
+package boomer
+
+import (
+	"crypto/md5"
+	"fmt"
+	"io"
+	"log"
+	"math"
+	"os"
+	"runtime/pprof"
+	"time"
+)
+
+func round(val float64, roundOn float64, places int) (newVal float64) {
+	var round float64
+	pow := math.Pow(10, float64(places))
+	digit := pow * val
+	_, div := math.Modf(digit)
+	if div >= roundOn {
+		round = math.Ceil(digit)
+	} else {
+		round = math.Floor(digit)
+	}
+	newVal = round / pow
+	return
+}
+
+// genMD5 returns the md5 hash of strings.
+func genMD5(slice ...string) string {
+	h := md5.New()
+	for _, v := range slice {
+		io.WriteString(h, v)
+	}
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+// startMemoryProfile starts memory profiling and save the results in file.
+func startMemoryProfile(file string, duration time.Duration) (err error) {
+	f, err := os.Create(file)
+	if err != nil {
+		return err
+	}
+
+	log.Println("Start memory profiling for", duration)
+	time.AfterFunc(duration, func() {
+		err = pprof.WriteHeapProfile(f)
+		if err != nil {
+			log.Println(err)
+		}
+		f.Close()
+		log.Println("Stop memory profiling after", duration)
+	})
+	return nil
+}
+
+// startCPUProfile starts cpu profiling and save the results in file.
+func startCPUProfile(file string, duration time.Duration) (err error) {
+	f, err := os.Create(file)
+	if err != nil {
+		return err
+	}
+
+	log.Println("Start cpu profiling for", duration)
+	err = pprof.StartCPUProfile(f)
+	if err != nil {
+		f.Close()
+		return err
+	}
+
+	time.AfterFunc(duration, func() {
+		pprof.StopCPUProfile()
+		f.Close()
+		log.Println("Stop CPU profiling after", duration)
+	})
+	return nil
+}