[#401] internal: Place randomization code in random package

Also replace seeding into `init` function.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

internal/rand.go

@@ -1,12 +0,0 @@
-package internal
-
-import (
-	"math/rand"
-	"time"
-)
-
-// RandUint32 returns random uint32 value [0, max).
-func RandUint32(max uint32) uint32 {
-	rand.Seed(time.Now().UnixNano())
-	return rand.Uint32() % max
-}

internal/random/rand.go

@@ -0,0 +1,15 @@
+package random
+
+import (
+	"math/rand"
+	"time"
+)
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+// Uint32 returns random uint32 value [0, max).
+func Uint32(max uint32) uint32 {
+	return rand.Uint32() % max
+}

object/test/generate.go

@@ -1,7 +1,7 @@
 package objecttest
 
 import (
-	"github.com/nspcc-dev/neofs-api-go/v2/internal"
+	"github.com/nspcc-dev/neofs-api-go/v2/internal/random"
 	"github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 	refstest "github.com/nspcc-dev/neofs-api-go/v2/refs/test"
@@ -186,7 +186,7 @@ func GenerateGetResponseBody(empty bool) *object.GetResponseBody {
 	m := new(object.GetResponseBody)
 
 	if !empty {
-		switch internal.RandUint32(3) {
+		switch random.Uint32(3) {
 		case 0:
 			m.SetObjectPart(GenerateGetObjectPartInit(false))
 		case 1:
@@ -240,7 +240,7 @@ func GeneratePutRequestBody(empty bool) *object.PutRequestBody {
 	m := new(object.PutRequestBody)
 
 	if !empty {
-		switch internal.RandUint32(2) {
+		switch random.Uint32(2) {
 		case 0:
 			m.SetObjectPart(GeneratePutObjectPartInit(false))
 		case 1:
@@ -362,7 +362,7 @@ func GenerateHeadResponseBody(empty bool) *object.HeadResponseBody {
 	m := new(object.HeadResponseBody)
 
 	if !empty {
-		switch internal.RandUint32(3) {
+		switch random.Uint32(3) {
 		case 0:
 			m.SetHeaderPart(GenerateHeaderWithSignature(false))
 		case 1:
@@ -524,7 +524,7 @@ func GenerateGetRangeResponseBody(empty bool) *object.GetRangeResponseBody {
 	m := new(object.GetRangeResponseBody)
 
 	if !empty {
-		switch internal.RandUint32(2) {
+		switch random.Uint32(2) {
 		case 0:
 			m.SetRangePart(GenerateGetRangePartChunk(false))
 		case 1:

session/test/generate.go

@@ -2,7 +2,7 @@ package sessiontest
 
 import (
 	acltest "github.com/nspcc-dev/neofs-api-go/v2/acl/test"
-	"github.com/nspcc-dev/neofs-api-go/v2/internal"
+	"github.com/nspcc-dev/neofs-api-go/v2/internal/random"
 	refstest "github.com/nspcc-dev/neofs-api-go/v2/refs/test"
 	"github.com/nspcc-dev/neofs-api-go/v2/session"
 	statustest "github.com/nspcc-dev/neofs-api-go/v2/status/test"
@@ -167,7 +167,7 @@ func GenerateSessionTokenBody(empty bool) *session.TokenBody {
 		m.SetOwnerID(refstest.GenerateOwnerID(false))
 		m.SetLifetime(GenerateTokenLifetime(false))
 
-		switch internal.RandUint32(2) {
+		switch random.Uint32(2) {
 		case 0:
 			m.SetContext(GenerateObjectSessionContext(false))
 		case 1: