Incorrect use of rand

[HunDunDM]

Enhancement Task

• Many packages use the following init functions, which cannot achieve the effect of setting seeds. The Rand object from New is unused.

func init() {
	rand.New(rand.NewSource(time.Now().UnixNano()))
}

• The global rand function is thread-safe at the cost of having a global write lock. This may cause unexpected performance problems in some places.