chore: update project layout

utils/typeutil/typeutil.go

@@ -0,0 +1,53 @@
+package typeutil
+
+import (
+	"time"
+
+	"golang.org/x/exp/constraints"
+)
+
+// Keys returns a slice of the keys of the map. based with go 1.18 generics
+func Keys[K comparable, V any](m map[K]V) []K {
+	r := make([]K, 0, len(m))
+	for k := range m {
+		r = append(r, k)
+	}
+	return r
+}
+
+func IntToBool[T constraints.Signed](a T) bool {
+	switch a {
+	case 0, -1:
+		return false
+	}
+	return true
+}
+
+func Reverse[T any](s []T) []T {
+	h := make([]T, len(s))
+	for i := 0; i < len(s); i++ {
+		h[i] = s[len(s)-i-1]
+	}
+	return h
+}
+
+func TimeStamp(stamp int64) time.Time {
+	s := time.Unix(stamp, 0)
+	if s.Local().Year() > 9999 {
+		return time.Date(9999, 12, 13, 23, 59, 59, 0, time.Local)
+	}
+	return s
+}
+
+func TimeEpoch(epoch int64) time.Time {
+	maxTime := int64(99633311740000000)
+	if epoch > maxTime {
+		return time.Date(2049, 1, 1, 1, 1, 1, 1, time.Local)
+	}
+	t := time.Date(1601, 1, 1, 0, 0, 0, 0, time.Local)
+	d := time.Duration(epoch)
+	for i := 0; i < 1000; i++ {
+		t = t.Add(d)
+	}
+	return t
+}

utils/typeutil/typeutil_test.go

@@ -0,0 +1,24 @@
+package typeutil
+
+import (
+	"testing"
+)
+
+func TestReverse(t *testing.T) {
+	t.Parallel()
+
+	reverseTestCases := [][]any{
+		{1, 2, 3, 4, 5},
+		{"1", "2", "3", "4", "5"},
+		{"1", 2, "3", "4", 5},
+	}
+
+	for _, ts := range reverseTestCases {
+		h := Reverse(ts)
+		for i := 0; i < len(ts); i++ {
+			if h[len(h)-i-1] != ts[i] {
+				t.Errorf("reverse failed %v != %v", h, ts)
+			}
+		}
+	}
+}