[#938] ir/netmap: Call AddPeer method if existing candidate was updated

In previous implementation IR handler of `AddPeer` notification didn't send
registration to contract if existing peer changed has changed its
information. as a consequence, the network map members could not update the
information without going into offline.

Change `processAddPeer` handler to check if
  * candidate in the network map is a brand new
  * or information about the network map member was changed
and call `AddPeer` method if so.

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

pkg/innerring/processors/netmap/cleanup_table.go

@@ -1,7 +1,9 @@
 package netmap
 
 import (
+	"bytes"
 	"encoding/hex"
+	"fmt"
 	"sync"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
@@ -12,13 +14,19 @@ type (
 		*sync.RWMutex
 		enabled    bool
 		threshold  uint64
-		lastAccess map[string]epochStamp
+		lastAccess map[string]epochStampWithNodeInfo
 	}
 
 	epochStamp struct {
 		epoch      uint64
 		removeFlag bool
 	}
+
+	epochStampWithNodeInfo struct {
+		epochStamp
+
+		binNodeInfo []byte
+	}
 )
 
 func newCleanupTable(enabled bool, threshold uint64) cleanupTable {
@@ -26,7 +34,7 @@ func newCleanupTable(enabled bool, threshold uint64) cleanupTable {
 		RWMutex:    new(sync.RWMutex),
 		enabled:    enabled,
 		threshold:  threshold,
-		lastAccess: make(map[string]epochStamp),
+		lastAccess: make(map[string]epochStampWithNodeInfo),
 	}
 }
 
@@ -36,33 +44,51 @@ func (c *cleanupTable) update(snapshot *netmap.Netmap, now uint64) {
 	defer c.Unlock()
 
 	// replacing map is less memory efficient but faster
-	newMap := make(map[string]epochStamp, len(snapshot.Nodes))
+	newMap := make(map[string]epochStampWithNodeInfo, len(snapshot.Nodes))
 
 	for i := range snapshot.Nodes {
-		keyString := hex.EncodeToString(snapshot.Nodes[i].PublicKey())
-		if access, ok := c.lastAccess[keyString]; ok {
-			access.removeFlag = false // reset remove Flag on each Update
-			newMap[keyString] = access
-		} else {
-			newMap[keyString] = epochStamp{epoch: now}
+		binNodeInfo, err := snapshot.Nodes[i].Marshal()
+		if err != nil {
+			panic(fmt.Errorf("could not marshal node info: %w", err)) // seems better than ignore
 		}
+
+		keyString := hex.EncodeToString(snapshot.Nodes[i].PublicKey())
+
+		access, ok := c.lastAccess[keyString]
+		if ok {
+			access.removeFlag = false // reset remove Flag on each Update
+		} else {
+			access.epoch = now
+		}
+
+		access.binNodeInfo = binNodeInfo
+
+		newMap[keyString] = access
 	}
 
 	c.lastAccess = newMap
 }
 
-func (c *cleanupTable) touch(keyString string, now uint64) bool {
+// updates last access time of the netmap node by string public key.
+//
+// Returns true if at least one condition is met:
+//  * node hasn't been accessed yet;
+//  * remove flag is set;
+//  * binary node info has changed.
+func (c *cleanupTable) touch(keyString string, now uint64, binNodeInfo []byte) bool {
 	c.Lock()
 	defer c.Unlock()
 
 	access, ok := c.lastAccess[keyString]
-	result := !access.removeFlag && ok
+	result := !ok || access.removeFlag || !bytes.Equal(access.binNodeInfo, binNodeInfo)
 
 	access.removeFlag = false // reset remove flag on each touch
 	if now > access.epoch {
 		access.epoch = now
 	}
 
+	access.binNodeInfo = binNodeInfo // update binary node info
+
 	c.lastAccess[keyString] = access
 
 	return result

pkg/innerring/processors/netmap/cleanup_table_test.go

@@ -25,10 +25,13 @@ func TestCleanupTable(t *testing.T) {
 	networkMap, err := netmap.NewNetmap(netmap.NodesFromInfo(infos))
 	require.NoError(t, err)
 
-	mapInfos := map[string]struct{}{
-		hex.EncodeToString(infos[0].PublicKey()): {},
-		hex.EncodeToString(infos[1].PublicKey()): {},
-		hex.EncodeToString(infos[2].PublicKey()): {},
+	mapInfos := make(map[string][]byte)
+
+	for i := range infos {
+		binNodeInfo, err := infos[i].Marshal()
+		require.NoError(t, err)
+
+		mapInfos[hex.EncodeToString(infos[i].PublicKey())] = binNodeInfo
 	}
 
 	t.Run("update", func(t *testing.T) {
@@ -59,10 +62,15 @@ func TestCleanupTable(t *testing.T) {
 		c.update(networkMap, 1)
 
 		key := hex.EncodeToString(infos[1].PublicKey())
-		require.True(t, c.touch(key, 11))
+		require.False(t, c.touch(key, 11, mapInfos[key]))
 		require.EqualValues(t, 11, c.lastAccess[key].epoch)
 
-		require.False(t, c.touch(key+"x", 12))
+		updNodeInfo := []byte("changed node info")
+
+		require.True(t, c.touch(key, 11, updNodeInfo))
+		require.EqualValues(t, 11, c.lastAccess[key].epoch)
+
+		require.True(t, c.touch(key+"x", 12, updNodeInfo))
 		require.EqualValues(t, 12, c.lastAccess[key+"x"].epoch)
 	})
 
@@ -74,7 +82,7 @@ func TestCleanupTable(t *testing.T) {
 		c.flag(key)
 		require.True(t, c.lastAccess[key].removeFlag)
 
-		require.False(t, c.touch(key, 2))
+		require.True(t, c.touch(key, 2, mapInfos[key]))
 		require.False(t, c.lastAccess[key].removeFlag)
 	})
 
@@ -108,7 +116,7 @@ func TestCleanupTable(t *testing.T) {
 			cnt := 0
 			key := hex.EncodeToString(infos[1].PublicKey())
 
-			require.False(t, c.touch(key, 4)) // one node was updated
+			require.True(t, c.touch(key, 4, mapInfos[key])) // one node was updated
 
 			require.NoError(t,
 				c.forEachRemoveCandidate(4, func(s string) error {

pkg/innerring/processors/netmap/process_peers.go

@@ -50,19 +50,8 @@ func (np *Processor) processAddPeer(ev netmapEvent.AddPeer) {
 	})
 	nodeInfo.SetAttributes(a...)
 
-	keyString := hex.EncodeToString(nodeInfo.PublicKey())
-
-	exists := np.netmapSnapshot.touch(keyString, np.epochState.EpochCounter())
-	if !exists {
-		np.log.Info("approving network map candidate",
-			zap.String("key", keyString))
-
-		if nr := ev.NotaryRequest(); nr != nil {
-			// notary event case
-
-			var nodeInfoBinary []byte
-
-			nodeInfoBinary, err = nodeInfo.Marshal()
+	// marshal updated node info structure
+	nodeInfoBinary, err := nodeInfo.Marshal()
 	if err != nil {
 		np.log.Warn("could not marshal updated network map candidate",
 			zap.String("error", err.Error()),
@@ -71,6 +60,15 @@ func (np *Processor) processAddPeer(ev netmapEvent.AddPeer) {
 		return
 	}
 
+	keyString := hex.EncodeToString(nodeInfo.PublicKey())
+
+	updated := np.netmapSnapshot.touch(keyString, np.epochState.EpochCounter(), nodeInfoBinary)
+
+	if updated {
+		np.log.Info("approving network map candidate",
+			zap.String("key", keyString))
+
+		if nr := ev.NotaryRequest(); nr != nil {
 			// create new notary request with the original nonce
 			err = np.netmapClient.Morph().NotaryInvoke(
 				np.netmapClient.ContractAddress(),