[#XX] container: Add ListStream method

Signed-off-by: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>

client/client.go

@@ -100,20 +100,27 @@ func (c *Client) Dial(ctx context.Context, prm PrmDial) error {
 
 	c.setFrostFSAPIServer((*coreServer)(&c.c))
 
+	ctx, cancel := context.WithTimeout(ctx, prm.DialTimeout)
+	defer cancel()
 	_, err := rpc.Balance(&c.c, new(v2accounting.BalanceRequest),
 		client.WithContext(ctx),
 	)
 	if err != nil {
+		var ctxErr error
+
 		// return context errors since they signal about dial problem
 		if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
-			return err
+			ctxErr = err
+		} else if st, ok := status.FromError(err); ok && st.Code() == codes.Canceled {
+			ctxErr = context.Canceled
+		} else if ok && st.Code() == codes.DeadlineExceeded {
+			ctxErr = context.DeadlineExceeded
 		}
-		st, ok := status.FromError(err)
-		if ok && st.Code() == codes.Canceled {
-			return context.Canceled
-		}
-		if ok && st.Code() == codes.DeadlineExceeded {
-			return context.DeadlineExceeded
+		if ctxErr != nil {
+			if conn := c.c.Conn(); conn != nil {
+				_ = conn.Close()
+			}
+			return ctxErr
 		}
 	}
 

client/container_list_stream.go

@@ -0,0 +1,182 @@
+package client
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+
+	v2container "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container"
+	v2refs "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
+	rpcapi "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc"
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
+	v2session "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/signature"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+)
+
+// PrmContainerListStream groups parameters of ContainerListStream operation.
+type PrmContainerListStream struct {
+	XHeaders []string
+
+	Account user.ID
+
+	Session *session.Container
+}
+
+// SetAccount sets identifier of the FrostFS account to list the containers.
+// Required parameter.
+//
+// Deprecated: Use PrmContainerListStream.Account instead.
+func (x *PrmContainerListStream) SetAccount(id user.ID) {
+	x.Account = id
+}
+
+func (x *PrmContainerListStream) buildRequest(c *Client) (*v2container.ListStreamRequest, error) {
+	if x.Account.IsEmpty() {
+		return nil, errorAccountNotSet
+	}
+
+	var ownerV2 v2refs.OwnerID
+	x.Account.WriteToV2(&ownerV2)
+
+	reqBody := new(v2container.ListStreamRequestBody)
+	reqBody.SetOwnerID(&ownerV2)
+
+	var meta v2session.RequestMetaHeader
+	writeXHeadersToMeta(x.XHeaders, &meta)
+
+	if x.Session != nil {
+		var tokv2 v2session.Token
+		x.Session.WriteToV2(&tokv2)
+
+		meta.SetSessionToken(&tokv2)
+	}
+
+	var req v2container.ListStreamRequest
+	req.SetBody(reqBody)
+	c.prepareRequest(&req, &meta)
+	return &req, nil
+}
+
+type ResContainerListStream struct {
+	statusRes
+}
+
+type ContainerListReader struct {
+	client          *Client
+	cancelCtxStream context.CancelFunc
+	err             error
+	res             ResContainerListStream
+	stream          interface {
+		Read(resp *v2container.ListStreamResponse) error
+	}
+	tail []v2refs.ContainerID
+}
+
+func (x *ContainerListReader) Read(buf []cid.ID) (int, bool) {
+	if len(buf) == 0 {
+		panic("empty buffer in ContainerListReader.ReadList")
+	}
+
+	read := copyCnrIDBuffers(buf, x.tail)
+	x.tail = x.tail[read:]
+
+	if len(buf) == read {
+		return read, true
+	}
+
+	for {
+		var resp v2container.ListStreamResponse
+		x.err = x.stream.Read(&resp)
+		if x.err != nil {
+			return read, false
+		}
+
+		x.res.st, x.err = x.client.processResponse(&resp)
+		if x.err != nil || !apistatus.IsSuccessful(x.res.st) {
+			return read, false
+		}
+
+		// read new chunk of objects
+		ids := resp.GetBody().GetContainerIDs()
+		if len(ids) == 0 {
+			// just skip empty lists since they are not prohibited by protocol
+			continue
+		}
+
+		ln := copyCnrIDBuffers(buf[read:], ids)
+		read += ln
+
+		if read == len(buf) {
+			// save the tail
+			x.tail = append(x.tail, ids[ln:]...)
+
+			return read, true
+		}
+	}
+}
+
+func copyCnrIDBuffers(dst []cid.ID, src []v2refs.ContainerID) int {
+	var i int
+	for ; i < len(dst) && i < len(src); i++ {
+		_ = dst[i].ReadFromV2(src[i])
+	}
+	return i
+}
+
+func (x *ContainerListReader) Iterate(f func(cid.ID) bool) error {
+	buf := make([]cid.ID, 1)
+
+	for {
+		// Do not check first return value because `len(buf) == 1`,
+		// so false means nothing was read.
+		_, ok := x.Read(buf)
+		if !ok {
+			res, err := x.Close()
+			if err != nil {
+				return err
+			}
+			return apistatus.ErrFromStatus(res.Status())
+		}
+		if f(buf[0]) {
+			return nil
+		}
+	}
+}
+
+func (x *ContainerListReader) Close() (*ResContainerListStream, error) {
+	defer x.cancelCtxStream()
+
+	if x.err != nil && !errors.Is(x.err, io.EOF) {
+		return nil, x.err
+	}
+
+	return &x.res, nil
+}
+
+func (c *Client) ContainerListInit(ctx context.Context, prm PrmContainerListStream) (*ContainerListReader, error) {
+	req, err := prm.buildRequest(c)
+	if err != nil {
+		return nil, err
+	}
+
+	err = signature.SignServiceMessage(&c.prm.Key, req)
+	if err != nil {
+		return nil, fmt.Errorf("sign request: %w", err)
+	}
+
+	var r ContainerListReader
+	ctx, r.cancelCtxStream = context.WithCancel(ctx)
+
+	r.stream, err = rpcapi.ListContainersStream(&c.c, req, client.WithContext(ctx))
+	if err != nil {
+		return nil, fmt.Errorf("open stream: %w", err)
+	}
+	r.client = c
+
+	return &r, nil
+}

client/object_search.go

@@ -220,7 +220,7 @@ func (x *ObjectListReader) Close() (*ResObjectSearch, error) {
 	defer x.cancelCtxStream()
 
 	if x.err != nil && !errors.Is(x.err, io.EOF) {
-		return nil, x.err
+		return &x.res, x.err
 	}
 
 	return &x.res, nil

client/status/common_test.go

@@ -114,7 +114,7 @@ func TestNodeUnderMaintenance(t *testing.T) {
 
 		stV2 := st.ToStatusV2()
 
-		require.Empty(t, "", stV2.Message())
+		require.Equal(t, "node is under maintenance", stV2.Message())
 	})
 
 	t.Run("non-empty to V2", func(t *testing.T) {

client/status/v2_test.go

@@ -61,6 +61,24 @@ func TestToStatusV2(t *testing.T) {
 			}),
 			codeV2: 1025,
 		},
+		{
+			status: (statusConstructor)(func() apistatus.Status {
+				return new(apistatus.SignatureVerification)
+			}),
+			codeV2: 1026,
+		},
+		{
+			status: (statusConstructor)(func() apistatus.Status {
+				return new(apistatus.NodeUnderMaintenance)
+			}),
+			codeV2: 1027,
+		},
+		{
+			status: (statusConstructor)(func() apistatus.Status {
+				return new(apistatus.InvalidArgument)
+			}),
+			codeV2: 1028,
+		},
 		{
 			status: (statusConstructor)(func() apistatus.Status {
 				return new(apistatus.ObjectLocked)
@@ -131,18 +149,6 @@ func TestToStatusV2(t *testing.T) {
 			}),
 			codeV2: 5120,
 		},
-		{
-			status: (statusConstructor)(func() apistatus.Status {
-				return new(apistatus.NodeUnderMaintenance)
-			}),
-			codeV2: 1027,
-		},
-		{
-			status: (statusConstructor)(func() apistatus.Status {
-				return new(apistatus.InvalidArgument)
-			}),
-			codeV2: 1028,
-		},
 	} {
 		var st apistatus.Status
 

go.mod

@@ -3,7 +3,7 @@ module git.frostfs.info/TrueCloudLab/frostfs-sdk-go
 go 1.22
 
 require (
-	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20241002064811-3e705a3cbe84
+	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20241011114054-f0fc40e116d1
 	git.frostfs.info/TrueCloudLab/frostfs-contract v0.19.3-0.20240621131249-49e5270f673e
 	git.frostfs.info/TrueCloudLab/hrw v1.2.1
 	git.frostfs.info/TrueCloudLab/tzhash v1.8.0

go.sum

@@ -1,5 +1,5 @@
-git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20241002064811-3e705a3cbe84 h1:enycv8Uaji5Ic1+hk+F4BpYOQKV5U5t8A9CV8AmU2+M=
-git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20241002064811-3e705a3cbe84/go.mod h1:F5GS7hRb62PUy5sTYDC4ajVdeffoAfjHSSHTKUJEaYU=
+git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20241011114054-f0fc40e116d1 h1:ivcdxQeQDnx4srF2ezoaeVlF0FAycSAztwfIUJnUI4s=
+git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.16.1-0.20241011114054-f0fc40e116d1/go.mod h1:F5GS7hRb62PUy5sTYDC4ajVdeffoAfjHSSHTKUJEaYU=
 git.frostfs.info/TrueCloudLab/frostfs-contract v0.19.3-0.20240621131249-49e5270f673e h1:kcBqZBiFIUBATUqEuvVigtkJJWQ2Gug/eYXn967o3M4=
 git.frostfs.info/TrueCloudLab/frostfs-contract v0.19.3-0.20240621131249-49e5270f673e/go.mod h1:F/fe1OoIDKr5Bz99q4sriuHDuf3aZefZy9ZsCqEtgxc=
 git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0 h1:FxqFDhQYYgpe41qsIHVOcdzSVCB8JNSfPG7Uk4r2oSk=

pool/mock_test.go

@@ -26,11 +26,15 @@ type mockClient struct {
 
 	errorOnDial          bool
 	errorOnCreateSession bool
-	errorOnEndpointInfo  bool
+	errorOnEndpointInfo  error
+	resOnEndpointInfo    netmap.NodeInfo
+	healthcheckFn        func()
 	errorOnNetworkInfo   bool
 	stOnGetObject        apistatus.Status
 }
 
+var _ client = (*mockClient)(nil)
+
 func newMockClient(addr string, key ecdsa.PrivateKey) *mockClient {
 	return &mockClient{
 		key:                 key,
@@ -38,6 +42,16 @@ func newMockClient(addr string, key ecdsa.PrivateKey) *mockClient {
 	}
 }
 
+func newMockClientHealthy(addr string, key ecdsa.PrivateKey, healthy bool) *mockClient {
+	m := newMockClient(addr, key)
+	if healthy {
+		m.setHealthy()
+	} else {
+		m.setUnhealthy()
+	}
+	return m
+}
+
 func (m *mockClient) setThreshold(threshold uint32) {
 	m.errorThreshold = threshold
 }
@@ -47,11 +61,11 @@ func (m *mockClient) errOnCreateSession() {
 }
 
 func (m *mockClient) errOnEndpointInfo() {
-	m.errorOnEndpointInfo = true
+	m.errorOnEndpointInfo = errors.New("error")
 }
 
 func (m *mockClient) errOnNetworkInfo() {
-	m.errorOnEndpointInfo = true
+	m.errorOnEndpointInfo = errors.New("error")
 }
 
 func (m *mockClient) errOnDial() {
@@ -94,27 +108,32 @@ func (m *mockClient) containerDelete(context.Context, PrmContainerDelete) error
 	return nil
 }
 
-func (c *mockClient) apeManagerAddChain(ctx context.Context, prm PrmAddAPEChain) error {
+func (m *mockClient) apeManagerAddChain(context.Context, PrmAddAPEChain) error {
 	return nil
 }
 
-func (c *mockClient) apeManagerRemoveChain(ctx context.Context, prm PrmRemoveAPEChain) error {
+func (m *mockClient) apeManagerRemoveChain(context.Context, PrmRemoveAPEChain) error {
 	return nil
 }
 
-func (c *mockClient) apeManagerListChains(ctx context.Context, prm PrmListAPEChains) ([]ape.Chain, error) {
+func (m *mockClient) apeManagerListChains(context.Context, PrmListAPEChains) ([]ape.Chain, error) {
 	return []ape.Chain{}, nil
 }
 
 func (m *mockClient) endpointInfo(ctx context.Context, _ prmEndpointInfo) (netmap.NodeInfo, error) {
-	var ni netmap.NodeInfo
-
-	if m.errorOnEndpointInfo {
-		return ni, m.handleError(ctx, nil, errors.New("error"))
+	if m.errorOnEndpointInfo != nil {
+		return netmap.NodeInfo{}, m.handleError(ctx, nil, m.errorOnEndpointInfo)
 	}
 
-	ni.SetNetworkEndpoints(m.addr)
-	return ni, nil
+	m.resOnEndpointInfo.SetNetworkEndpoints(m.addr)
+	return m.resOnEndpointInfo, nil
+}
+
+func (m *mockClient) healthcheck(ctx context.Context) (netmap.NodeInfo, error) {
+	if m.healthcheckFn != nil {
+		m.healthcheckFn()
+	}
+	return m.endpointInfo(ctx, prmEndpointInfo{})
 }
 
 func (m *mockClient) networkInfo(ctx context.Context, _ prmNetworkInfo) (netmap.NetworkInfo, error) {
@@ -190,16 +209,12 @@ func (m *mockClient) dial(context.Context) error {
 	return nil
 }
 
-func (m *mockClient) restartIfUnhealthy(ctx context.Context) (changed bool, err error) {
-	_, err = m.endpointInfo(ctx, prmEndpointInfo{})
-	healthy := err == nil
-	changed = healthy != m.isHealthy()
-	if healthy {
-		m.setHealthy()
-	} else {
-		m.setUnhealthy()
+func (m *mockClient) restart(context.Context) error {
+	if m.errorOnDial {
+		return errors.New("restart dial error")
 	}
-	return
+
+	return nil
 }
 
 func (m *mockClient) close() error {

pool/pool.go

@@ -57,6 +57,8 @@ type client interface {
 	apeManagerListChains(context.Context, PrmListAPEChains) ([]ape.Chain, error)
 	// see clientWrapper.endpointInfo.
 	endpointInfo(context.Context, prmEndpointInfo) (netmap.NodeInfo, error)
+	// see clientWrapper.healthcheck.
+	healthcheck(ctx context.Context) (netmap.NodeInfo, error)
 	// see clientWrapper.networkInfo.
 	networkInfo(context.Context, prmNetworkInfo) (netmap.NetworkInfo, error)
 	// see clientWrapper.netMapSnapshot
@@ -82,8 +84,8 @@ type client interface {
 
 	// see clientWrapper.dial.
 	dial(ctx context.Context) error
-	// see clientWrapper.restartIfUnhealthy.
-	restartIfUnhealthy(ctx context.Context) (bool, error)
+	// see clientWrapper.restart.
+	restart(ctx context.Context) error
 	// see clientWrapper.close.
 	close() error
 }
@@ -92,10 +94,10 @@ type client interface {
 type clientStatus interface {
 	// isHealthy checks if the connection can handle requests.
 	isHealthy() bool
-	// isDialed checks if the connection was created.
-	isDialed() bool
 	// setUnhealthy marks client as unhealthy.
 	setUnhealthy()
+	// setHealthy marks client as healthy.
+	setHealthy()
 	// address return address of endpoint.
 	address() string
 	// currentErrorRate returns current errors rate.
@@ -126,15 +128,10 @@ type clientStatusMonitor struct {
 
 // values for healthy status of clientStatusMonitor.
 const (
-	// statusUnhealthyOnDial is set when dialing to the endpoint is failed,
-	// so there is no connection to the endpoint, and pool should not close it
-	// before re-establishing connection once again.
-	statusUnhealthyOnDial = iota
-
 	// statusUnhealthyOnRequest is set when communication after dialing to the
 	// endpoint is failed due to immediate or accumulated errors, connection is
 	// available and pool should close it before re-establishing connection once again.
-	statusUnhealthyOnRequest
+	statusUnhealthyOnRequest = iota
 
 	// statusHealthy is set when connection is ready to be used by the pool.
 	statusHealthy
@@ -233,6 +230,7 @@ func newClientStatusMonitor(logger *zap.Logger, addr string, errorThreshold uint
 type clientWrapper struct {
 	clientMutex sync.RWMutex
 	client      *sdkClient.Client
+	dialed      bool
 	prm         wrapperPrm
 
 	clientStatusMonitor
@@ -342,30 +340,17 @@ func (c *clientWrapper) dial(ctx context.Context) error {
 		GRPCDialOptions: c.prm.dialOptions,
 	}
 
-	if err = cl.Dial(ctx, prmDial); err != nil {
-		c.setUnhealthyOnDial()
+	err = cl.Dial(ctx, prmDial)
+	c.setDialed(err == nil)
+	if err != nil {
 		return err
 	}
 
 	return nil
 }
 
-// restartIfUnhealthy checks healthy status of client and recreate it if status is unhealthy.
-// Indicating if status was changed by this function call and returns error that caused unhealthy status.
-func (c *clientWrapper) restartIfUnhealthy(ctx context.Context) (changed bool, err error) {
-	var wasHealthy bool
-	if _, err = c.endpointInfo(ctx, prmEndpointInfo{}); err == nil {
-		return false, nil
-	} else if !errors.Is(err, errPoolClientUnhealthy) {
-		wasHealthy = true
-	}
-
-	// if connection is dialed before, to avoid routine / connection leak,
-	// pool has to close it and then initialize once again.
-	if c.isDialed() {
-		c.scheduleGracefulClose()
-	}
-
+// restart recreates and redial inner sdk client.
+func (c *clientWrapper) restart(ctx context.Context) error {
 	var cl sdkClient.Client
 	prmInit := sdkClient.PrmInit{
 		Key:                  c.prm.key,
@@ -381,22 +366,35 @@ func (c *clientWrapper) restartIfUnhealthy(ctx context.Context) (changed bool, e
 		GRPCDialOptions: c.prm.dialOptions,
 	}
 
-	if err = cl.Dial(ctx, prmDial); err != nil {
-		c.setUnhealthyOnDial()
-		return wasHealthy, err
+	// if connection is dialed before, to avoid routine / connection leak,
+	// pool has to close it and then initialize once again.
+	if c.isDialed() {
+		c.scheduleGracefulClose()
+	}
+
+	err := cl.Dial(ctx, prmDial)
+	c.setDialed(err == nil)
+	if err != nil {
+		return err
 	}
 
 	c.clientMutex.Lock()
 	c.client = &cl
 	c.clientMutex.Unlock()
 
-	if _, err = cl.EndpointInfo(ctx, sdkClient.PrmEndpointInfo{}); err != nil {
-		c.setUnhealthy()
-		return wasHealthy, err
-	}
+	return nil
+}
 
-	c.setHealthy()
-	return !wasHealthy, nil
+func (c *clientWrapper) isDialed() bool {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.dialed
+}
+
+func (c *clientWrapper) setDialed(dialed bool) {
+	c.mu.Lock()
+	c.dialed = dialed
+	c.mu.Unlock()
 }
 
 func (c *clientWrapper) getClient() (*sdkClient.Client, error) {
@@ -654,6 +652,15 @@ func (c *clientWrapper) endpointInfo(ctx context.Context, _ prmEndpointInfo) (ne
 		return netmap.NodeInfo{}, err
 	}
 
+	return c.endpointInfoRaw(ctx, cl)
+}
+
+func (c *clientWrapper) healthcheck(ctx context.Context) (netmap.NodeInfo, error) {
+	cl := c.getClientRaw()
+	return c.endpointInfoRaw(ctx, cl)
+}
+
+func (c *clientWrapper) endpointInfoRaw(ctx context.Context, cl *sdkClient.Client) (netmap.NodeInfo, error) {
 	start := time.Now()
 	res, err := cl.EndpointInfo(ctx, sdkClient.PrmEndpointInfo{})
 	c.incRequests(time.Since(start), methodEndpointInfo)
@@ -1085,7 +1092,7 @@ func (c *clientWrapper) objectSearch(ctx context.Context, prm PrmObjectSearch) (
 		return ResObjectSearch{}, fmt.Errorf("init object searching on client: %w", err)
 	}
 
-	return ResObjectSearch{r: res}, nil
+	return ResObjectSearch{r: res, handleError: c.handleError}, nil
 }
 
 // sessionCreate invokes sdkClient.SessionCreate parse response status to error and return result as is.
@@ -1121,10 +1128,6 @@ func (c *clientStatusMonitor) isHealthy() bool {
 	return c.healthy.Load() == statusHealthy
 }
 
-func (c *clientStatusMonitor) isDialed() bool {
-	return c.healthy.Load() != statusUnhealthyOnDial
-}
-
 func (c *clientStatusMonitor) setHealthy() {
 	c.healthy.Store(statusHealthy)
 }
@@ -1133,10 +1136,6 @@ func (c *clientStatusMonitor) setUnhealthy() {
 	c.healthy.Store(statusUnhealthyOnRequest)
 }
 
-func (c *clientStatusMonitor) setUnhealthyOnDial() {
-	c.healthy.Store(statusUnhealthyOnDial)
-}
-
 func (c *clientStatusMonitor) address() string {
 	return c.addr
 }
@@ -1159,6 +1158,16 @@ func (c *clientStatusMonitor) incErrorRate() {
 	}
 }
 
+func (c *clientStatusMonitor) incErrorRateToUnhealthy(err error) {
+	c.mu.Lock()
+	c.currentErrorCount = 0
+	c.overallErrorCount++
+	c.setUnhealthy()
+	c.mu.Unlock()
+
+	c.log(zapcore.WarnLevel, "explicitly mark node unhealthy", zap.String("address", c.addr), zap.Error(err))
+}
+
 func (c *clientStatusMonitor) log(level zapcore.Level, msg string, fields ...zap.Field) {
 	if c.logger == nil {
 		return
@@ -1201,6 +1210,9 @@ func (c *clientWrapper) incRequests(elapsed time.Duration, method MethodIndex) {
 }
 
 func (c *clientWrapper) close() error {
+	if !c.isDialed() {
+		return nil
+	}
 	if cl := c.getClientRaw(); cl != nil {
 		return cl.Close()
 	}
@@ -1225,9 +1237,10 @@ func (c *clientStatusMonitor) handleError(ctx context.Context, st apistatus.Stat
 		switch stErr.(type) {
 		case *apistatus.ServerInternal,
 			*apistatus.WrongMagicNumber,
-			*apistatus.SignatureVerification,
-			*apistatus.NodeUnderMaintenance:
+			*apistatus.SignatureVerification:
 			c.incErrorRate()
+		case *apistatus.NodeUnderMaintenance:
+			c.incErrorRateToUnhealthy(stErr)
 		}
 
 		if err == nil {
@@ -1239,7 +1252,11 @@ func (c *clientStatusMonitor) handleError(ctx context.Context, st apistatus.Stat
 
 	if err != nil {
 		if needCountError(ctx, err) {
-			c.incErrorRate()
+			if sdkClient.IsErrNodeUnderMaintenance(err) {
+				c.incErrorRateToUnhealthy(err)
+			} else {
+				c.incErrorRate()
+			}
 		}
 
 		return err
@@ -1261,7 +1278,7 @@ func needCountError(ctx context.Context, err error) bool {
 		return false
 	}
 
-	if errors.Is(ctx.Err(), context.Canceled) {
+	if ctx != nil && errors.Is(ctx.Err(), context.Canceled) {
 		return false
 	}
 
@@ -2138,7 +2155,9 @@ func adjustNodeParams(nodeParams []NodeParam) ([]*nodesParam, error) {
 
 // startRebalance runs loop to monitor connection healthy status.
 func (p *Pool) startRebalance(ctx context.Context) {
-	ticker := time.NewTimer(p.rebalanceParams.clientRebalanceInterval)
+	ticker := time.NewTicker(p.rebalanceParams.clientRebalanceInterval)
+	defer ticker.Stop()
+
 	buffers := make([][]float64, len(p.rebalanceParams.nodesParams))
 	for i, params := range p.rebalanceParams.nodesParams {
 		buffers[i] = make([]float64, len(params.weights))
@@ -2188,7 +2207,7 @@ func (p *Pool) updateInnerNodesHealth(ctx context.Context, i int, bufferWeights
 			tctx, c := context.WithTimeout(ctx, options.nodeRequestTimeout)
 			defer c()
 
-			changed, err := cli.restartIfUnhealthy(tctx)
+			changed, err := restartIfUnhealthy(tctx, cli)
 			healthy := err == nil
 			if healthy {
 				bufferWeights[j] = options.nodesParams[i].weights[j]
@@ -2219,6 +2238,43 @@ func (p *Pool) updateInnerNodesHealth(ctx context.Context, i int, bufferWeights
 	}
 }
 
+// restartIfUnhealthy checks healthy status of client and recreate it if status is unhealthy.
+// Indicating if status was changed by this function call and returns error that caused unhealthy status.
+func restartIfUnhealthy(ctx context.Context, c client) (changed bool, err error) {
+	defer func() {
+		if err != nil {
+			c.setUnhealthy()
+		} else {
+			c.setHealthy()
+		}
+	}()
+
+	wasHealthy := c.isHealthy()
+
+	if res, err := c.healthcheck(ctx); err == nil {
+		if res.Status().IsMaintenance() {
+			return wasHealthy, new(apistatus.NodeUnderMaintenance)
+		}
+
+		return !wasHealthy, nil
+	}
+
+	if err = c.restart(ctx); err != nil {
+		return wasHealthy, err
+	}
+
+	res, err := c.healthcheck(ctx)
+	if err != nil {
+		return wasHealthy, err
+	}
+
+	if res.Status().IsMaintenance() {
+		return wasHealthy, new(apistatus.NodeUnderMaintenance)
+	}
+
+	return !wasHealthy, nil
+}
+
 func adjustWeights(weights []float64) []float64 {
 	adjusted := make([]float64, len(weights))
 	sum := 0.0
@@ -2708,18 +2764,25 @@ func (p *Pool) ObjectRange(ctx context.Context, prm PrmObjectRange) (ResObjectRa
 //
 // Must be initialized using Pool.SearchObjects, any other usage is unsafe.
 type ResObjectSearch struct {
-	r *sdkClient.ObjectListReader
+	r           *sdkClient.ObjectListReader
+	handleError func(context.Context, apistatus.Status, error) error
 }
 
 // Read reads another list of the object identifiers.
 func (x *ResObjectSearch) Read(buf []oid.ID) (int, error) {
 	n, ok := x.r.Read(buf)
 	if !ok {
-		_, err := x.r.Close()
+		res, err := x.r.Close()
 		if err == nil {
 			return n, io.EOF
 		}
 
+		var status apistatus.Status
+		if res != nil {
+			status = res.Status()
+		}
+		err = x.handleError(nil, status, err)
+
 		return n, err
 	}
 
@@ -3017,9 +3080,7 @@ func (p *Pool) Close() {
 	// close all clients
 	for _, pools := range p.innerPools {
 		for _, cli := range pools.clients {
-			if cli.isDialed() {
-				_ = cli.close()
-			}
+			_ = cli.close()
 		}
 	}
 }

pool/pool_test.go

@@ -4,12 +4,13 @@ import (
 	"context"
 	"crypto/ecdsa"
 	"errors"
-	"strconv"
+	"math/rand"
 	"testing"
 	"time"
 
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	frostfsecdsa "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/crypto/ecdsa"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
@@ -17,6 +18,8 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap"
+	"go.uber.org/zap/zaptest"
+	"go.uber.org/zap/zaptest/observer"
 )
 
 func TestBuildPoolClientFailed(t *testing.T) {
@@ -230,6 +233,179 @@ func TestOneOfTwoFailed(t *testing.T) {
 	}
 }
 
+func TestUpdateNodesHealth(t *testing.T) {
+	ctx := context.Background()
+	key := newPrivateKey(t)
+
+	for _, tc := range []struct {
+		name        string
+		wasHealthy  bool
+		willHealthy bool
+		prepareCli  func(*mockClient)
+	}{
+		{
+			name:        "healthy, maintenance, unhealthy",
+			wasHealthy:  true,
+			willHealthy: false,
+			prepareCli:  func(c *mockClient) { c.resOnEndpointInfo.SetStatus(netmap.Maintenance) },
+		},
+		{
+			name:        "unhealthy, maintenance, unhealthy",
+			wasHealthy:  false,
+			willHealthy: false,
+			prepareCli:  func(c *mockClient) { c.resOnEndpointInfo.SetStatus(netmap.Maintenance) },
+		},
+		{
+			name:        "healthy, no error, healthy",
+			wasHealthy:  true,
+			willHealthy: true,
+			prepareCli:  func(c *mockClient) { c.resOnEndpointInfo.SetStatus(netmap.Online) },
+		},
+		{
+			name:        "unhealthy, no error, healthy",
+			wasHealthy:  false,
+			willHealthy: true,
+			prepareCli:  func(c *mockClient) { c.resOnEndpointInfo.SetStatus(netmap.Online) },
+		},
+		{
+			name:        "healthy, error, failed restart, unhealthy",
+			wasHealthy:  true,
+			willHealthy: false,
+			prepareCli: func(c *mockClient) {
+				c.errOnEndpointInfo()
+				c.errorOnDial = true
+			},
+		},
+		{
+			name:        "unhealthy, error, failed restart, unhealthy",
+			wasHealthy:  false,
+			willHealthy: false,
+			prepareCli: func(c *mockClient) {
+				c.errOnEndpointInfo()
+				c.errorOnDial = true
+			},
+		},
+		{
+			name:        "healthy, error, restart, error, unhealthy",
+			wasHealthy:  true,
+			willHealthy: false,
+			prepareCli:  func(c *mockClient) { c.errOnEndpointInfo() },
+		},
+		{
+			name:        "unhealthy, error, restart, error, unhealthy",
+			wasHealthy:  false,
+			willHealthy: false,
+			prepareCli:  func(c *mockClient) { c.errOnEndpointInfo() },
+		},
+		{
+			name:        "healthy, error, restart, maintenance, unhealthy",
+			wasHealthy:  true,
+			willHealthy: false,
+			prepareCli: func(c *mockClient) {
+				healthError := true
+				c.healthcheckFn = func() {
+					if healthError {
+						c.errorOnEndpointInfo = errors.New("error")
+					} else {
+						c.errorOnEndpointInfo = nil
+						c.resOnEndpointInfo.SetStatus(netmap.Maintenance)
+					}
+					healthError = !healthError
+				}
+			},
+		},
+		{
+			name:        "unhealthy, error, restart, maintenance, unhealthy",
+			wasHealthy:  false,
+			willHealthy: false,
+			prepareCli: func(c *mockClient) {
+				healthError := true
+				c.healthcheckFn = func() {
+					if healthError {
+						c.errorOnEndpointInfo = errors.New("error")
+					} else {
+						c.errorOnEndpointInfo = nil
+						c.resOnEndpointInfo.SetStatus(netmap.Maintenance)
+					}
+					healthError = !healthError
+				}
+			},
+		},
+		{
+			name:        "healthy, error, restart, healthy",
+			wasHealthy:  true,
+			willHealthy: true,
+			prepareCli: func(c *mockClient) {
+				healthError := true
+				c.healthcheckFn = func() {
+					if healthError {
+						c.errorOnEndpointInfo = errors.New("error")
+					} else {
+						c.errorOnEndpointInfo = nil
+					}
+					healthError = !healthError
+				}
+			},
+		},
+		{
+			name:        "unhealthy, error, restart, healthy",
+			wasHealthy:  false,
+			willHealthy: true,
+			prepareCli: func(c *mockClient) {
+				healthError := true
+				c.healthcheckFn = func() {
+					if healthError {
+						c.errorOnEndpointInfo = errors.New("error")
+					} else {
+						c.errorOnEndpointInfo = nil
+					}
+					healthError = !healthError
+				}
+			},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			cli := newMockClientHealthy("peer0", *key, tc.wasHealthy)
+			tc.prepareCli(cli)
+			p, log := newPool(t, cli)
+
+			p.updateNodesHealth(ctx, [][]float64{{1}})
+
+			changed := tc.wasHealthy != tc.willHealthy
+			require.Equalf(t, tc.willHealthy, cli.isHealthy(), "healthy status should be: %v", tc.willHealthy)
+			require.Equalf(t, changed, 1 == log.Len(), "healthy status should be changed: %v", changed)
+		})
+	}
+}
+
+func newPool(t *testing.T, cli *mockClient) (*Pool, *observer.ObservedLogs) {
+	log, observedLog := getObservedLogger()
+
+	cache, err := newCache(0)
+	require.NoError(t, err)
+
+	return &Pool{
+		innerPools: []*innerPool{{
+			sampler: newSampler([]float64{1}, rand.NewSource(0)),
+			clients: []client{cli},
+		}},
+		cache:    cache,
+		key:      newPrivateKey(t),
+		closedCh: make(chan struct{}),
+		rebalanceParams: rebalanceParameters{
+			nodesParams:             []*nodesParam{{1, []string{"peer0"}, []float64{1}}},
+			nodeRequestTimeout:      time.Second,
+			clientRebalanceInterval: 200 * time.Millisecond,
+		},
+		logger: log,
+	}, observedLog
+}
+
+func getObservedLogger() (*zap.Logger, *observer.ObservedLogs) {
+	loggerCore, observedLog := observer.New(zap.DebugLevel)
+	return zap.New(loggerCore), observedLog
+}
+
 func TestTwoFailed(t *testing.T) {
 	var clientKeys []*ecdsa.PrivateKey
 	mockClientBuilder := func(addr string) client {
@@ -529,13 +705,6 @@ func TestStatusMonitor(t *testing.T) {
 			isHealthy   bool
 			description string
 		}{
-			{
-				action:      func(m *clientStatusMonitor) { m.setUnhealthyOnDial() },
-				status:      statusUnhealthyOnDial,
-				isDialed:    false,
-				isHealthy:   false,
-				description: "set unhealthy on dial",
-			},
 			{
 				action:      func(m *clientStatusMonitor) { m.setUnhealthy() },
 				status:      statusUnhealthyOnRequest,
@@ -554,7 +723,6 @@ func TestStatusMonitor(t *testing.T) {
 		for _, tc := range cases {
 			tc.action(&monitor)
 			require.Equal(t, tc.status, monitor.healthy.Load())
-			require.Equal(t, tc.isDialed, monitor.isDialed())
 			require.Equal(t, tc.isHealthy, monitor.isHealthy())
 		}
 	})
@@ -562,19 +730,22 @@ func TestStatusMonitor(t *testing.T) {
 
 func TestHandleError(t *testing.T) {
 	ctx := context.Background()
-	monitor := newClientStatusMonitor(zap.NewExample(), "", 10)
+	log := zaptest.NewLogger(t)
 
 	canceledCtx, cancel := context.WithCancel(context.Background())
 	cancel()
 
-	for i, tc := range []struct {
-		ctx           context.Context
-		status        apistatus.Status
-		err           error
-		expectedError bool
-		countError    bool
+	for _, tc := range []struct {
+		name            string
+		ctx             context.Context
+		status          apistatus.Status
+		err             error
+		expectedError   bool
+		countError      bool
+		markedUnhealthy bool
 	}{
 		{
+			name:          "no error, no status",
 			ctx:           ctx,
 			status:        nil,
 			err:           nil,
@@ -582,6 +753,7 @@ func TestHandleError(t *testing.T) {
 			countError:    false,
 		},
 		{
+			name:          "no error, success status",
 			ctx:           ctx,
 			status:        new(apistatus.SuccessDefaultV2),
 			err:           nil,
@@ -589,6 +761,7 @@ func TestHandleError(t *testing.T) {
 			countError:    false,
 		},
 		{
+			name:          "error, success status",
 			ctx:           ctx,
 			status:        new(apistatus.SuccessDefaultV2),
 			err:           errors.New("error"),
@@ -596,6 +769,7 @@ func TestHandleError(t *testing.T) {
 			countError:    true,
 		},
 		{
+			name:          "error, no status",
 			ctx:           ctx,
 			status:        nil,
 			err:           errors.New("error"),
@@ -603,6 +777,7 @@ func TestHandleError(t *testing.T) {
 			countError:    true,
 		},
 		{
+			name:          "no error, object not found status",
 			ctx:           ctx,
 			status:        new(apistatus.ObjectNotFound),
 			err:           nil,
@@ -610,6 +785,7 @@ func TestHandleError(t *testing.T) {
 			countError:    false,
 		},
 		{
+			name:          "object not found error, object not found status",
 			ctx:           ctx,
 			status:        new(apistatus.ObjectNotFound),
 			err:           &apistatus.ObjectNotFound{},
@@ -617,6 +793,7 @@ func TestHandleError(t *testing.T) {
 			countError:    false,
 		},
 		{
+			name:          "eacl not found error, no status",
 			ctx:           ctx,
 			status:        nil,
 			err:           &apistatus.EACLNotFound{},
@@ -627,6 +804,7 @@ func TestHandleError(t *testing.T) {
 			countError: true,
 		},
 		{
+			name:          "no error, internal status",
 			ctx:           ctx,
 			status:        new(apistatus.ServerInternal),
 			err:           nil,
@@ -634,6 +812,7 @@ func TestHandleError(t *testing.T) {
 			countError:    true,
 		},
 		{
+			name:          "no error, wrong magic status",
 			ctx:           ctx,
 			status:        new(apistatus.WrongMagicNumber),
 			err:           nil,
@@ -641,6 +820,7 @@ func TestHandleError(t *testing.T) {
 			countError:    true,
 		},
 		{
+			name:          "no error, signature verification status",
 			ctx:           ctx,
 			status:        new(apistatus.SignatureVerification),
 			err:           nil,
@@ -648,13 +828,25 @@ func TestHandleError(t *testing.T) {
 			countError:    true,
 		},
 		{
-			ctx:           ctx,
-			status:        new(apistatus.NodeUnderMaintenance),
-			err:           nil,
-			expectedError: true,
-			countError:    true,
+			name:            "no error, maintenance status",
+			ctx:             ctx,
+			status:          new(apistatus.NodeUnderMaintenance),
+			err:             nil,
+			expectedError:   true,
+			countError:      true,
+			markedUnhealthy: true,
 		},
 		{
+			name:            "maintenance error, no status",
+			ctx:             ctx,
+			status:          nil,
+			err:             &apistatus.NodeUnderMaintenance{},
+			expectedError:   true,
+			countError:      true,
+			markedUnhealthy: true,
+		},
+		{
+			name:          "no error, invalid argument status",
 			ctx:           ctx,
 			status:        new(apistatus.InvalidArgument),
 			err:           nil,
@@ -662,6 +854,7 @@ func TestHandleError(t *testing.T) {
 			countError:    false,
 		},
 		{
+			name:          "context canceled error, no status",
 			ctx:           canceledCtx,
 			status:        nil,
 			err:           errors.New("error"),
@@ -669,8 +862,9 @@ func TestHandleError(t *testing.T) {
 			countError:    false,
 		},
 	} {
-		t.Run(strconv.Itoa(i), func(t *testing.T) {
-			errCount := monitor.currentErrorRate()
+		t.Run(tc.name, func(t *testing.T) {
+			monitor := newClientStatusMonitor(log, "", 10)
+			errCount := monitor.overallErrorRate()
 			err := monitor.handleError(tc.ctx, tc.status, tc.err)
 			if tc.expectedError {
 				require.Error(t, err)
@@ -680,7 +874,10 @@ func TestHandleError(t *testing.T) {
 			if tc.countError {
 				errCount++
 			}
-			require.Equal(t, errCount, monitor.currentErrorRate())
+			require.Equal(t, errCount, monitor.overallErrorRate())
+			if tc.markedUnhealthy {
+				require.False(t, monitor.isHealthy())
+			}
 		})
 	}
 }