Method to take raw client (#388)

close #379

pool/mock_test.go

@@ -8,6 +8,7 @@ import (
 	"github.com/google/uuid"
 	sessionv2 "github.com/nspcc-dev/neofs-api-go/v2/session"
 	"github.com/nspcc-dev/neofs-sdk-go/accounting"
+	sdkClient "github.com/nspcc-dev/neofs-sdk-go/client"
 	apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
 	"github.com/nspcc-dev/neofs-sdk-go/container"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
@@ -187,3 +188,7 @@ func (m *mockClient) restartIfUnhealthy(ctx context.Context) (healthy bool, chan
 	}
 	return
 }
+
+func (m *mockClient) getClient() (*sdkClient.Client, error) {
+	return nil, errors.New("now supported to return sdkClient from mockClient")
+}

pool/pool.go

@@ -76,6 +76,8 @@ type client interface {
 	dial(ctx context.Context) error
 	// see clientWrapper.restartIfUnhealthy.
 	restartIfUnhealthy(ctx context.Context) (bool, bool)
+
+	getClient() (*sdkClient.Client, error)
 }
 
 // clientStatus provide access to some metrics for connection.
@@ -2104,6 +2106,16 @@ func (p *Pool) DeleteObject(ctx context.Context, prm PrmObjectDelete) error {
 	})
 }
 
+// RawClient returns single client instance to have possibility to work with exact one.
+func (p *Pool) RawClient() (*sdkClient.Client, error) {
+	conn, err := p.connection()
+	if err != nil {
+		return nil, err
+	}
+
+	return conn.getClient()
+}
+
 type objectReadCloser struct {
 	reader              *sdkClient.ObjectReader
 	elapsedTimeCallback func(time.Duration)