[#165] pool: make private inner structs

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

pool/cache.go

@@ -8,7 +8,7 @@ import (
 	"github.com/nspcc-dev/neofs-sdk-go/session"
 )
 
-type SessionCache struct {
+type sessionCache struct {
 	cache *lru.Cache
 }
 
@@ -17,16 +17,16 @@ type cacheValue struct {
 	token *session.Token
 }
 
-func NewCache() (*SessionCache, error) {
+func newCache() (*sessionCache, error) {
 	cache, err := lru.New(100)
 	if err != nil {
 		return nil, err
 	}
 
-	return &SessionCache{cache: cache}, nil
+	return &sessionCache{cache: cache}, nil
 }
 
-func (c *SessionCache) Get(key string) *session.Token {
+func (c *sessionCache) Get(key string) *session.Token {
 	valueRaw, ok := c.cache.Get(key)
 	if !ok {
 		return nil
@@ -38,7 +38,7 @@ func (c *SessionCache) Get(key string) *session.Token {
 	return value.token
 }
 
-func (c *SessionCache) GetAccessTime(key string) (time.Time, bool) {
+func (c *sessionCache) GetAccessTime(key string) (time.Time, bool) {
 	valueRaw, ok := c.cache.Peek(key)
 	if !ok {
 		return time.Time{}, false
@@ -47,14 +47,14 @@ func (c *SessionCache) GetAccessTime(key string) (time.Time, bool) {
 	return valueRaw.(*cacheValue).atime, true
 }
 
-func (c *SessionCache) Put(key string, token *session.Token) bool {
+func (c *sessionCache) Put(key string, token *session.Token) bool {
 	return c.cache.Add(key, &cacheValue{
 		atime: time.Now(),
 		token: token,
 	})
 }
 
-func (c *SessionCache) DeleteByPrefix(prefix string) {
+func (c *sessionCache) DeleteByPrefix(prefix string) {
 	for _, key := range c.cache.Keys() {
 		if strings.HasPrefix(key.(string), prefix) {
 			c.cache.Remove(key)

pool/cache_test.go

@@ -10,7 +10,7 @@ import (
 func TestSessionCache_GetAccessTime(t *testing.T) {
 	const key = "Foo"
 
-	cache, err := NewCache()
+	cache, err := newCache()
 	require.NoError(t, err)
 
 	cache.Put(key, nil)

pool/key.go

@@ -1,27 +0,0 @@
-package pool
-
-import (
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"math/big"
-)
-
-// NewEphemeralKey creates new private key used for NeoFS session. It'll be
-// removed after refactoring to use neo-go crypto library.
-func NewEphemeralKey() (*ecdsa.PrivateKey, error) {
-	c := elliptic.P256()
-	priv, x, y, err := elliptic.GenerateKey(c, rand.Reader)
-	if err != nil {
-		return nil, err
-	}
-	key := &ecdsa.PrivateKey{
-		PublicKey: ecdsa.PublicKey{
-			Curve: c,
-			X:     x,
-			Y:     y,
-		},
-		D: new(big.Int).SetBytes(priv),
-	}
-	return key, nil
-}

pool/pool.go

@@ -165,14 +165,14 @@ type Pool struct {
 	owner           *owner.ID
 	cancel          context.CancelFunc
 	closedCh        chan struct{}
-	cache           *SessionCache
+	cache           *sessionCache
 	stokenDuration  uint64
 	stokenThreshold time.Duration
 }
 
 type innerPool struct {
 	lock        sync.RWMutex
-	sampler     *Sampler
+	sampler     *sampler
 	clientPacks []*clientPack
 }
 
@@ -197,7 +197,7 @@ func NewPool(ctx context.Context, options InitParameters) (*Pool, error) {
 
 	fillDefaultInitParams(&options)
 
-	cache, err := NewCache()
+	cache, err := newCache()
 	if err != nil {
 		return nil, fmt.Errorf("couldn't create cache: %w", err)
 	}
@@ -228,7 +228,7 @@ func NewPool(ctx context.Context, options InitParameters) (*Pool, error) {
 			clientPacks[j] = &clientPack{client: c, healthy: healthy, address: addr}
 		}
 		source := rand.NewSource(time.Now().UnixNano())
-		sampler := NewSampler(params.weights, source)
+		sampler := newSampler(params.weights, source)
 
 		inner[i] = &innerPool{
 			sampler:     sampler,
@@ -419,7 +419,7 @@ func updateInnerNodesHealth(ctx context.Context, pool *Pool, i int, options reba
 		probabilities := adjustWeights(bufferWeights)
 		source := rand.NewSource(time.Now().UnixNano())
 		p.lock.Lock()
-		p.sampler = NewSampler(probabilities, source)
+		p.sampler = newSampler(probabilities, source)
 		p.lock.Unlock()
 	}
 }

pool/pool_test.go

@@ -536,11 +536,11 @@ func TestWaitPresence(t *testing.T) {
 	mockClient.EXPECT().NetworkInfo(gomock.Any(), gomock.Any()).Return(&client.ResNetworkInfo{}, nil).AnyTimes()
 	mockClient.EXPECT().GetContainer(gomock.Any(), gomock.Any()).Return(nil, nil).AnyTimes()
 
-	cache, err := NewCache()
+	cache, err := newCache()
 	require.NoError(t, err)
 
 	inner := &innerPool{
-		sampler: NewSampler([]float64{1}, rand.NewSource(0)),
+		sampler: newSampler([]float64{1}, rand.NewSource(0)),
 		clientPacks: []*clientPack{{
 			client:  mockClient,
 			healthy: true,

pool/sampler.go

@@ -2,19 +2,19 @@ package pool
 
 import "math/rand"
 
-// Sampler implements weighted random number generation using Vose's Alias
+// sampler implements weighted random number generation using Vose's Alias
 // Method (https://www.keithschwarz.com/darts-dice-coins/).
-type Sampler struct {
+type sampler struct {
 	randomGenerator *rand.Rand
 	probabilities   []float64
 	alias           []int
 }
 
-// NewSampler creates new Sampler with a given set of probabilities using
-// given source of randomness. Created Sampler will produce numbers from
+// newSampler creates new sampler with a given set of probabilities using
+// given source of randomness. Created sampler will produce numbers from
 // 0 to len(probabilities).
-func NewSampler(probabilities []float64, source rand.Source) *Sampler {
-	sampler := &Sampler{}
+func newSampler(probabilities []float64, source rand.Source) *sampler {
+	sampler := &sampler{}
 	var (
 		small workList
 		large workList
@@ -57,8 +57,8 @@ func NewSampler(probabilities []float64, source rand.Source) *Sampler {
 	return sampler
 }
 
-// Next returns the next (not so) random number from Sampler.
-func (g *Sampler) Next() int {
+// Next returns the next (not so) random number from sampler.
+func (g *sampler) Next() int {
 	n := len(g.alias)
 	i := g.randomGenerator.Intn(n)
 	if g.randomGenerator.Float64() < g.probabilities[i] {

pool/sampler_test.go

@@ -32,7 +32,7 @@ func TestSamplerStability(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		sampler := NewSampler(tc.probabilities, rand.NewSource(0))
+		sampler := newSampler(tc.probabilities, rand.NewSource(0))
 		res := make([]int, len(tc.probabilities))
 		for i := 0; i < COUNT; i++ {
 			res[sampler.Next()]++
@@ -72,11 +72,11 @@ func TestHealthyReweight(t *testing.T) {
 		buffer  = make([]float64, len(weights))
 	)
 
-	cache, err := NewCache()
+	cache, err := newCache()
 	require.NoError(t, err)
 
 	inner := &innerPool{
-		sampler: NewSampler(weights, rand.NewSource(0)),
+		sampler: newSampler(weights, rand.NewSource(0)),
 		clientPacks: []*clientPack{
 			{client: newNetmapMock(names[0], true), healthy: true, address: "address0"},
 			{client: newNetmapMock(names[1], false), healthy: true, address: "address1"}},
@@ -106,7 +106,7 @@ func TestHealthyReweight(t *testing.T) {
 	inner.lock.Unlock()
 
 	updateInnerNodesHealth(context.TODO(), p, 0, options, buffer)
-	inner.sampler = NewSampler(weights, rand.NewSource(0))
+	inner.sampler = newSampler(weights, rand.NewSource(0))
 
 	connection0, _, err = p.Connection()
 	require.NoError(t, err)
@@ -122,7 +122,7 @@ func TestHealthyNoReweight(t *testing.T) {
 		buffer  = make([]float64, len(weights))
 	)
 
-	sampler := NewSampler(weights, rand.NewSource(0))
+	sampler := newSampler(weights, rand.NewSource(0))
 	inner := &innerPool{
 		sampler: sampler,
 		clientPacks: []*clientPack{