move time checks into block.go and add time source mechanism

libs/time/mocks/source.go

@@ -0,0 +1,28 @@
+// Code generated by mockery. DO NOT EDIT.
+
+package mocks
+
+import (
+	time "time"
+
+	mock "github.com/stretchr/testify/mock"
+)
+
+// Source is an autogenerated mock type for the Source type
+type Source struct {
+	mock.Mock
+}
+
+// Now provides a mock function with given fields:
+func (_m *Source) Now() time.Time {
+	ret := _m.Called()
+
+	var r0 time.Time
+	if rf, ok := ret.Get(0).(func() time.Time); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(time.Time)
+	}
+
+	return r0
+}

libs/time/time.go

@@ -15,3 +15,17 @@ func Now() time.Time {
 func Canonical(t time.Time) time.Time {
 	return t.Round(0).UTC()
 }
+
+//go:generate ../../scripts/mockery_generate.sh Source
+
+// Source is an interface that defines a way to fetch the current time.
+type Source interface {
+	Now() time.Time
+}
+
+// DefaultSource implements the Source interface using the system clock provided by the standard library.
+type DefaultSource struct{}
+
+func (DefaultSource) Now() time.Time {
+	return Now()
+}