[#304] morph: Iterate endpoints when create ws client in constructor

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

CHANGELOG.md

@@ -13,6 +13,7 @@ Changelog for FrostFS Node
 - Read config files from dir even if config file not provided via `--config` for node (#238)
 - Notary requests parsing according to `neo-go`'s updates (#268)
 - Tree service panic in its internal client cache (#322)
+- Iterate over endpoints when create ws client in morph's constructor (#304)
 
 ### Removed
 ### Updated

internal/logs/logs.go

@@ -413,6 +413,8 @@ const (
 	FrostFSIRInternalError                                                  = "internal error"                                                            // Info in ../node/cmd/frostfs-ir/main.go
 	FrostFSIRCouldNotShutdownHTTPServer                                     = "could not shutdown HTTP server"                                            // Debug in ../node/cmd/frostfs-ir/main.go
 	FrostFSIRApplicationStopped                                             = "application stopped"                                                       // Info in ../node/cmd/frostfs-ir/main.go
+	FrostFSIRCouldntCreateRPCClientForEndpoint                              = "could not create RPC client for endpoint"                                  // Debug in ../node/pkg/morph/client/constructor.go
+	FrostFSIRCreatedRPCClientForEndpoint                                    = "created RPC client for endpoint"                                           // Info in ../node/pkg/morph/client/constructor.go
 	FrostFSNodeCouldNotReadCertificateFromFile                              = "could not read certificate from file"                                      // Error in ../node/cmd/frostfs-node/grpc.go
 	FrostFSNodeCantListenGRPCEndpoint                                       = "can't listen gRPC endpoint"                                                // Error in ../node/cmd/frostfs-node/grpc.go
 	FrostFSNodeStopListeningGRPCEndpoint                                    = "stop listening gRPC endpoint"                                              // Info in ../node/cmd/frostfs-node/grpc.go

pkg/morph/client/constructor.go

@@ -7,6 +7,7 @@ import (
 	"sync"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	lru "github.com/hashicorp/golang-lru/v2"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
@@ -52,6 +53,10 @@ const (
 	defaultWaitInterval = 500 * time.Millisecond
 )
 
+var (
+	ErrNoHealthyEndpoint = errors.New("no healthy endpoint")
+)
+
 func defaultConfig() *cfg {
 	return &cfg{
 		dialTimeout:  defaultDialTimeout,
@@ -80,6 +85,8 @@ func defaultConfig() *cfg {
 // If desired option satisfies the default value, it can be omitted.
 // If multiple options of the same config value are supplied,
 // the option with the highest index in the arguments will be used.
+// If the list of endpoints provided - uses first alive.
+// If there are no healthy endpoint - returns ErrNoHealthyEndpoint.
 func New(ctx context.Context, key *keys.PrivateKey, opts ...Option) (*Client, error) {
 	if key == nil {
 		panic("empty private key")
@@ -137,9 +144,20 @@ func New(ctx context.Context, key *keys.PrivateKey, opts ...Option) (*Client, er
 			return nil, fmt.Errorf("could not create RPC actor: %w", err)
 		}
 	} else {
-		cli.client, act, err = cli.newCli(ctx, cli.endpoints.list[0].Address)
-		if err != nil {
-			return nil, fmt.Errorf("could not create RPC client: %w", err)
+		var endpoint Endpoint
+		for cli.endpoints.curr, endpoint = range cli.endpoints.list {
+			cli.client, act, err = cli.newCli(ctx, endpoint.Address)
+			if err != nil {
+				cli.logger.Warn(logs.FrostFSIRCouldntCreateRPCClientForEndpoint,
+					zap.Error(err), zap.String("endpoint", endpoint.Address))
+			} else {
+				cli.logger.Info(logs.FrostFSIRCreatedRPCClientForEndpoint,
+					zap.String("endpoint", endpoint.Address))
+				break
+			}
+		}
+		if cli.client == nil {
+			return nil, ErrNoHealthyEndpoint
 		}
 	}
 	cli.setActor(act)