Add TLS support, initial etcd connection check, fix key_prefix handling for etcd backend meta storage (#5403)

docker/compose/test-etcd-filer.yml

@@ -30,6 +30,7 @@ services:
     environment:
       WEED_LEVELDB2_ENABLED: 'false'
       WEED_ETCD_ENABLED: 'true'
+      WEED_ETCD_KEY_PREFIX: 'seaweedfs.'
       WEED_ETCD_SERVERS: "http://etcd:2379"
     volumes:
       - ./s3.json:/etc/seaweedfs/s3.json

weed/command/scaffold/filer.toml

@@ -270,6 +270,12 @@ username = ""
 password = ""
 key_prefix = "seaweedfs."
 timeout = "3s"
+# Set the CA certificate path
+tls_ca_file=""
+# Set the client certificate path
+tls_client_crt_file=""
+# Set the client private key path
+tls_client_key_file=""
 
 [mongodb]
 enabled = false

weed/filer/etcd/etcd_store.go

@@ -1,9 +1,10 @@
 package etcd
 
 import (
-	"bytes"
 	"context"
+	"crypto/tls"
 	"fmt"
+	"go.etcd.io/etcd/client/pkg/v3/transport"
 	"strings"
 	"time"
 
@@ -26,49 +27,78 @@ func init() {
 type EtcdStore struct {
 	client        *clientv3.Client
 	etcdKeyPrefix string
+	timeout       time.Duration
 }
 
 func (store *EtcdStore) GetName() string {
 	return "etcd"
 }
 
-func (store *EtcdStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
+func (store *EtcdStore) Initialize(configuration weed_util.Configuration, prefix string) error {
+	configuration.SetDefault(prefix+"servers", "localhost:2379")
+	configuration.SetDefault(prefix+"timeout", "3s")
+
 	servers := configuration.GetString(prefix + "servers")
-	if servers == "" {
-		servers = "localhost:2379"
-	}
 
 	username := configuration.GetString(prefix + "username")
 	password := configuration.GetString(prefix + "password")
 	store.etcdKeyPrefix = configuration.GetString(prefix + "key_prefix")
 
-	timeout := configuration.GetString(prefix + "timeout")
-	if timeout == "" {
-		timeout = "3s"
-	}
-
-	return store.initialize(servers, username, password, timeout)
+	timeoutStr := configuration.GetString(prefix + "timeout")
+	timeout, err := time.ParseDuration(timeoutStr)
+	if err != nil {
+		return fmt.Errorf("parse etcd store timeout: %v", err)
 	}
+	store.timeout = timeout
 
-func (store *EtcdStore) initialize(servers string, username string, password string, timeout string) (err error) {
-	glog.Infof("filer store etcd: %s", servers)
+	certFile := configuration.GetString(prefix + "tls_client_crt_file")
+	keyFile := configuration.GetString(prefix + "tls_client_key_file")
+	caFile := configuration.GetString(prefix + "tls_ca_file")
 
-	to, err := time.ParseDuration(timeout)
+	var tlsConfig *tls.Config
+	if caFile != "" {
+		tlsInfo := transport.TLSInfo{
+			CertFile:      certFile,
+			KeyFile:       keyFile,
+			TrustedCAFile: caFile,
+		}
+		var err error
+		tlsConfig, err = tlsInfo.ClientConfig()
 		if err != nil {
-		return fmt.Errorf("parse timeout %s: %s", timeout, err)
+			return fmt.Errorf("TLS client configuration error: %v", err)
+		}
+	}
+
+	return store.initialize(servers, username, password, store.timeout, tlsConfig)
 }
 
-	store.client, err = clientv3.New(clientv3.Config{
+func (store *EtcdStore) initialize(servers, username, password string, timeout time.Duration, tlsConfig *tls.Config) error {
+	glog.Infof("filer store etcd: %s", servers)
+
+	client, err := clientv3.New(clientv3.Config{
 		Endpoints:   strings.Split(servers, ","),
 		Username:    username,
 		Password:    password,
-		DialTimeout: to,
+		DialTimeout: timeout,
+		TLS:         tlsConfig,
 	})
 	if err != nil {
 		return fmt.Errorf("connect to etcd %s: %s", servers, err)
 	}
 
-	return
+	ctx, cancel := context.WithTimeout(context.Background(), store.timeout)
+	defer cancel()
+
+	resp, err := client.Status(ctx, client.Endpoints()[0])
+	if err != nil {
+		client.Close()
+		return fmt.Errorf("error checking etcd connection: %s", err)
+	}
+
+	glog.V(0).Infof("сonnection to etcd has been successfully verified. etcd version: %s", resp.Version)
+	store.client = client
+
+	return nil
 }
 
 func (store *EtcdStore) BeginTransaction(ctx context.Context) (context.Context, error) {
@@ -159,15 +189,13 @@ func (store *EtcdStore) ListDirectoryEntries(ctx context.Context, dirPath weed_u
 	}
 
 	resp, err := store.client.Get(ctx, store.etcdKeyPrefix+string(lastFileStart),
-		clientv3.WithFromKey(), clientv3.WithLimit(limit+1))
+		clientv3.WithRange(clientv3.GetPrefixRangeEnd(store.etcdKeyPrefix+string(directoryPrefix))),
+		clientv3.WithLimit(limit+1))
 	if err != nil {
 		return lastFileName, fmt.Errorf("list %s : %v", dirPath, err)
 	}
 
 	for _, kv := range resp.Kvs {
-		if !bytes.HasPrefix(kv.Key, directoryPrefix) {
-			break
-		}
 		fileName := getNameFromKey(kv.Key)
 		if fileName == "" {
 			continue

weed/filer/etcd/etcd_store_test.go

@@ -10,7 +10,7 @@ func TestStore(t *testing.T) {
 	// to set up local env
 	if false {
 		store := &EtcdStore{}
-		store.initialize("localhost:2379", "", "", "3s")
+		store.initialize("localhost:2379", "", "", 3, nil)
 		store_test.TestFilerStore(t, store)
 	}
 }