package command

import (
	"context"
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"net"
	"net/http"
	"os"
	"runtime"
	"sort"
	"strings"
	"sync"
	"time"

	"github.com/spf13/viper"
	"google.golang.org/grpc/reflection"

	"github.com/seaweedfs/seaweedfs/weed/credential"
	_ "github.com/seaweedfs/seaweedfs/weed/credential/filer_etc"
	_ "github.com/seaweedfs/seaweedfs/weed/credential/memory"
	_ "github.com/seaweedfs/seaweedfs/weed/credential/postgres"
	"github.com/seaweedfs/seaweedfs/weed/filer"
	"github.com/seaweedfs/seaweedfs/weed/glog"
	"github.com/seaweedfs/seaweedfs/weed/pb"
	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
	"github.com/seaweedfs/seaweedfs/weed/pb/iam_pb"
	"github.com/seaweedfs/seaweedfs/weed/security"
	weed_server "github.com/seaweedfs/seaweedfs/weed/server"
	stats_collect "github.com/seaweedfs/seaweedfs/weed/stats"
	"github.com/seaweedfs/seaweedfs/weed/util"
	"github.com/seaweedfs/seaweedfs/weed/util/grace"
	"github.com/seaweedfs/seaweedfs/weed/util/version"
)

var (
	f                  FilerOptions
	filerStartS3       *bool
	filerS3Options     S3Options
	filerStartWebDav   *bool
	filerWebDavOptions WebDavOption
	filerStartIam      *bool
	filerIamOptions    IamOptions
	filerStartSftp     *bool
	filerSftpOptions   SftpOptions
)

type FilerOptions struct {
	masters                   *pb.ServerDiscovery
	mastersString             *string
	ip                        *string
	bindIp                    *string
	port                      *int
	portGrpc                  *int
	publicPort                *int
	filerGroup                *string
	collection                *string
	defaultReplicaPlacement   *string
	disableDirListing         *bool
	maxMB                     *int
	dirListingLimit           *int
	dataCenter                *string
	rack                      *string
	enableNotification        *bool
	disableHttp               *bool
	cipher                    *bool
	metricsHttpPort           *int
	metricsHttpIp             *string
	saveToFilerLimit          *int
	defaultLevelDbDirectory   *string
	concurrentUploadLimitMB   *int
	concurrentFileUploadLimit *int
	debug                     *bool
	debugPort                 *int
	localSocket               *string
	showUIDirectoryDelete     *bool
	downloadMaxMBps           *int
	diskType                  *string
	allowedOrigins            *string
	exposeDirectoryData       *bool
	tusBasePath               *string
	tusMaxSizeMB              *int
	tusSessionExpiry          *time.Duration
	s3ConfigFile              *string // optional path to static S3 identity config
	// shutdownCtx, when non-nil, tells startFiler to gracefully shut down its
	// HTTP/gRPC servers once the ctx is cancelled. Used by integration tests
	// and by weed mini; nil for standalone weed filer.
	shutdownCtx context.Context
	// gracefulStopTimeout caps how long startFiler waits for gRPC graceful
	// stop before forcing the server to stop. Zero means the default of 10s.
	gracefulStopTimeout time.Duration
}

func init() {
	cmdFiler.Run = runFiler // break init cycle
	f.mastersString = cmdFiler.Flag.String("master", "localhost:9333", "comma-separated master servers or a single DNS SRV record of at least 1 master server, prepended with dnssrv+")
	f.filerGroup = cmdFiler.Flag.String("filerGroup", "", "share metadata with other filers in the same filerGroup")
	f.collection = cmdFiler.Flag.String("collection", "", "all data will be stored in this default collection")
	f.ip = cmdFiler.Flag.String("ip", util.DetectedHostAddress(), "filer server http listen ip address")
	f.bindIp = cmdFiler.Flag.String("ip.bind", "", "ip address to bind to. If empty, default to same as -ip option.")
	f.port = cmdFiler.Flag.Int("port", 8888, "filer server http listen port")
	f.portGrpc = cmdFiler.Flag.Int("port.grpc", 0, "filer server grpc listen port")
	f.publicPort = cmdFiler.Flag.Int("port.readonly", 0, "readonly port opened to public")
	f.defaultReplicaPlacement = cmdFiler.Flag.String("defaultReplicaPlacement", "", "default replication type. If not specified, use master setting.")
	f.disableDirListing = cmdFiler.Flag.Bool("disableDirListing", false, "turn off directory listing")
	f.maxMB = cmdFiler.Flag.Int("maxMB", 4, "split files larger than the limit")
	f.dirListingLimit = cmdFiler.Flag.Int("dirListLimit", 100000, "limit sub dir listing size")
	f.dataCenter = cmdFiler.Flag.String("dataCenter", "", "prefer to read and write to volumes in this data center")
	f.rack = cmdFiler.Flag.String("rack", "", "prefer to write to volumes in this rack")
	f.disableHttp = cmdFiler.Flag.Bool("disableHttp", false, "disable http request, only gRpc operations are allowed")
	f.cipher = cmdFiler.Flag.Bool("encryptVolumeData", false, "encrypt data on volume servers")
	f.metricsHttpPort = cmdFiler.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
	f.metricsHttpIp = cmdFiler.Flag.String("metricsIp", "", "metrics listen ip. If empty, default to same as -ip.bind option.")
	f.saveToFilerLimit = cmdFiler.Flag.Int("saveToFilerLimit", 0, "files smaller than this limit will be saved in filer store")
	f.defaultLevelDbDirectory = cmdFiler.Flag.String("defaultStoreDir", ".", "if filer.toml is empty, use an embedded filer store in the directory")
	f.concurrentUploadLimitMB = cmdFiler.Flag.Int("concurrentUploadLimitMB", 0, "limit total concurrent upload size, 0 means unlimited")
	f.concurrentFileUploadLimit = cmdFiler.Flag.Int("concurrentFileUploadLimit", 0, "limit number of concurrent file uploads, 0 means unlimited")
	f.debug = cmdFiler.Flag.Bool("debug", false, "serves runtime profiling data, e.g., http://localhost:<debug.port>/debug/pprof/goroutine?debug=2")
	f.debugPort = cmdFiler.Flag.Int("debug.port", 6060, "http port for debugging")
	f.localSocket = cmdFiler.Flag.String("localSocket", "", "default to /tmp/seaweedfs-filer-<port>.sock")
	f.showUIDirectoryDelete = cmdFiler.Flag.Bool("ui.deleteDir", true, "enable filer UI show delete directory button")
	f.downloadMaxMBps = cmdFiler.Flag.Int("downloadMaxMBps", 0, "download max speed for each download request, in MB per second")
	f.diskType = cmdFiler.Flag.String("disk", "", "[hdd|ssd|<tag>] hard drive or solid state drive or any tag")
	f.allowedOrigins = cmdFiler.Flag.String("allowedOrigins", "*", "comma separated list of allowed origins")
	f.exposeDirectoryData = cmdFiler.Flag.Bool("exposeDirectoryData", true, "whether to return directory metadata and content in Filer UI")
	f.tusBasePath = cmdFiler.Flag.String("tusBasePath", "/.tus", "TUS resumable upload endpoint base path (e.g., /.tus)")
	f.tusMaxSizeMB = cmdFiler.Flag.Int("tusMaxSizeMB", 5*1024, "maximum TUS upload size in MB")
	f.tusSessionExpiry = cmdFiler.Flag.Duration("tusSessionExpiry", 24*time.Hour, "incomplete TUS upload sessions are cleaned up after this duration, e.g. \"48h\", \"7h30m\"")

	// start s3 on filer
	filerStartS3 = cmdFiler.Flag.Bool("s3", false, "whether to start S3 gateway")
	filerS3Options.port = cmdFiler.Flag.Int("s3.port", 8333, "s3 server http listen port")
	filerS3Options.portHttps = cmdFiler.Flag.Int("s3.port.https", 0, "s3 server https listen port")
	filerS3Options.portGrpc = cmdFiler.Flag.Int("s3.port.grpc", 0, "s3 server grpc listen port")
	filerS3Options.domainName = cmdFiler.Flag.String("s3.domainName", "", "suffix of the host name in comma separated list, {bucket}.{domainName}")
	filerS3Options.allowedOrigins = cmdFiler.Flag.String("s3.allowedOrigins", "*", "comma separated list of allowed origins")
	filerS3Options.dataCenter = cmdFiler.Flag.String("s3.dataCenter", "", "prefer to read and write to volumes in this data center")
	filerS3Options.tlsPrivateKey = cmdFiler.Flag.String("s3.key.file", "", "path to the TLS private key file")
	filerS3Options.tlsCertificate = cmdFiler.Flag.String("s3.cert.file", "", "path to the TLS certificate file")
	filerS3Options.config = cmdFiler.Flag.String("s3.config", "", "path to the config file")
	filerS3Options.iamConfig = cmdFiler.Flag.String("s3.iam.config", "", "path to the advanced IAM config file")
	filerS3Options.auditLogConfig = cmdFiler.Flag.String("s3.auditLogConfig", "", "path to the audit log config file")
	filerS3Options.metricsHttpPort = cmdFiler.Flag.Int("s3.metricsPort", 0, "Prometheus metrics listen port")
	filerS3Options.metricsHttpIp = cmdFiler.Flag.String("s3.metricsIp", "", "metrics listen ip. If empty, default to same as -s3.ip.bind option.")
	cmdFiler.Flag.Bool("s3.allowEmptyFolder", true, "deprecated, ignored. Empty folder cleanup is now automatic.")
	filerS3Options.allowDeleteBucketNotEmpty = cmdFiler.Flag.Bool("s3.allowDeleteBucketNotEmpty", true, "allow recursive deleting all entries along with bucket")
	filerS3Options.autoCreateBucket = cmdFiler.Flag.Bool("s3.autoCreateBucket", true, "create the bucket on upload if it does not exist, for admin identities only")
	filerS3Options.localSocket = cmdFiler.Flag.String("s3.localSocket", "", "default to /tmp/seaweedfs-s3-<port>.sock")
	filerS3Options.tlsCACertificate = cmdFiler.Flag.String("s3.cacert.file", "", "path to the TLS CA certificate file")
	filerS3Options.tlsVerifyClientCert = cmdFiler.Flag.Bool("s3.tlsVerifyClientCert", false, "whether to verify the client's certificate")
	filerS3Options.bindIp = cmdFiler.Flag.String("s3.ip.bind", "", "ip address to bind to. If empty, default to same as -ip.bind option.")
	filerS3Options.idleTimeout = cmdFiler.Flag.Int("s3.idleTimeout", 120, "connection idle seconds")
	filerS3Options.concurrentUploadLimitMB = cmdFiler.Flag.Int("s3.concurrentUploadLimitMB", 0, "limit total concurrent upload size for S3, 0 means unlimited")
	filerS3Options.concurrentFileUploadLimit = cmdFiler.Flag.Int("s3.concurrentFileUploadLimit", 0, "limit number of concurrent file uploads for S3, 0 means unlimited")
	filerS3Options.enableIam = cmdFiler.Flag.Bool("s3.iam", true, "enable embedded IAM API on the same S3 port")
	filerS3Options.cipher = cmdFiler.Flag.Bool("s3.encryptVolumeData", false, "encrypt data on volume servers for S3 uploads")
	filerS3Options.iamReadOnly = cmdFiler.Flag.Bool("s3.iam.readOnly", true, "disable IAM write operations on this server")
	filerS3Options.portIceberg = cmdFiler.Flag.Int("s3.port.iceberg", 8181, "Iceberg REST Catalog server listen port (0 to disable)")
	filerS3Options.portLance = cmdFiler.Flag.Int("s3.port.lance", 9101, "Lance Namespace server listen port (0 to disable)")
	filerS3Options.externalUrl = cmdFiler.Flag.String("s3.externalUrl", "", "the external URL clients use to connect (e.g. https://api.example.com:9000). Advertised to Iceberg and Lance clients, and tried first when verifying S3 signatures behind a reverse proxy. Falls back to S3_EXTERNAL_URL env var.")
	filerS3Options.defaultFileMode = cmdFiler.Flag.String("s3.defaultFileMode", "", "default file mode for S3 uploaded objects, e.g. 0660, 0644, 0666")
	filerS3Options.cacheSizeMB = cmdFiler.Flag.Int64("s3.cacheCapacityMB", 0, "in-memory chunk cache capacity in MB for S3 GETs shared across requests (0 disables)")

	// start webdav on filer
	filerStartWebDav = cmdFiler.Flag.Bool("webdav", false, "whether to start webdav gateway")
	filerWebDavOptions.port = cmdFiler.Flag.Int("webdav.port", 7333, "webdav server http listen port")
	filerWebDavOptions.collection = cmdFiler.Flag.String("webdav.collection", "", "collection to create the files")
	filerWebDavOptions.replication = cmdFiler.Flag.String("webdav.replication", "", "replication to create the files")
	filerWebDavOptions.disk = cmdFiler.Flag.String("webdav.disk", "", "[hdd|ssd|<tag>] hard drive or solid state drive or any tag")
	filerWebDavOptions.tlsPrivateKey = cmdFiler.Flag.String("webdav.key.file", "", "path to the TLS private key file")
	filerWebDavOptions.tlsCertificate = cmdFiler.Flag.String("webdav.cert.file", "", "path to the TLS certificate file")
	filerWebDavOptions.cacheDir = cmdFiler.Flag.String("webdav.cacheDir", os.TempDir(), "local cache directory for file chunks")
	filerWebDavOptions.cacheSizeMB = cmdFiler.Flag.Int64("webdav.cacheCapacityMB", 0, "local cache capacity in MB")
	filerWebDavOptions.maxMB = cmdFiler.Flag.Int("webdav.maxMB", 4, "split files larger than the limit")
	filerWebDavOptions.filerRootPath = cmdFiler.Flag.String("webdav.filer.path", "/", "use this remote path from filer server")

	// start iam on filer
	filerStartIam = cmdFiler.Flag.Bool("iam", false, "whether to start IAM service")
	filerIamOptions.ip = cmdFiler.Flag.String("iam.ip", *f.ip, "iam server http listen ip address")
	filerIamOptions.port = cmdFiler.Flag.Int("iam.port", 8111, "iam server http listen port")

	filerStartSftp = cmdFiler.Flag.Bool("sftp", false, "whether to start the SFTP server")
	filerSftpOptions.port = cmdFiler.Flag.Int("sftp.port", 2022, "SFTP server listen port")
	filerSftpOptions.sshPrivateKey = cmdFiler.Flag.String("sftp.sshPrivateKey", "", "path to the SSH private key file for host authentication")
	filerSftpOptions.hostKeysFolder = cmdFiler.Flag.String("sftp.hostKeysFolder", "", "path to folder containing SSH private key files for host authentication")
	filerSftpOptions.authMethods = cmdFiler.Flag.String("sftp.authMethods", "password,publickey", "comma-separated list of allowed auth methods: password, publickey, certificate")
	filerSftpOptions.maxAuthTries = cmdFiler.Flag.Int("sftp.maxAuthTries", 6, "maximum number of authentication attempts per connection")
	filerSftpOptions.bannerMessage = cmdFiler.Flag.String("sftp.bannerMessage", "SeaweedFS SFTP Server - Unauthorized access is prohibited", "message displayed before authentication")
	filerSftpOptions.loginGraceTime = cmdFiler.Flag.Duration("sftp.loginGraceTime", 2*time.Minute, "timeout for authentication")
	filerSftpOptions.clientAliveInterval = cmdFiler.Flag.Duration("sftp.clientAliveInterval", 5*time.Second, "interval for sending keep-alive messages")
	filerSftpOptions.clientAliveCountMax = cmdFiler.Flag.Int("sftp.clientAliveCountMax", 3, "maximum number of missed keep-alive messages before disconnecting")
	filerSftpOptions.userStoreFile = cmdFiler.Flag.String("sftp.userStoreFile", "", "path to JSON file containing user credentials and permissions")
	filerSftpOptions.trustedUserCAKeysFile = cmdFiler.Flag.String("sftp.trustedUserCAKeysFile", "", "path to a file with trusted user CA public keys (OpenSSH authorized_keys format); required when 'certificate' is in -sftp.authMethods")
	filerSftpOptions.dataCenter = cmdFiler.Flag.String("sftp.dataCenter", "", "prefer to read and write to volumes in this data center")
	filerSftpOptions.bindIp = cmdFiler.Flag.String("sftp.ip.bind", "", "ip address to bind to. If empty, default to same as -ip.bind option.")
	filerSftpOptions.localSocket = cmdFiler.Flag.String("sftp.localSocket", "", "default to /tmp/seaweedfs-sftp-<port>.sock")
}

func filerLongDesc() string {
	desc := `start a file server which accepts REST operation for any files.

	//create or overwrite the file, the directories /path/to will be automatically created
	POST /path/to/file
	//get the file content
	GET /path/to/file
	//create or overwrite the file, the filename in the multipart request will be used
	POST /path/to/
	//return a json format subdirectory and files listing
	GET /path/to/

	The configuration file "filer.toml" is read from ".", "$HOME/.seaweedfs/", "/usr/local/etc/seaweedfs/", or "/etc/seaweedfs/", in that order.
	If the "filer.toml" is not found, an embedded filer store will be created under "-defaultStoreDir".

	The example filer.toml configuration file can be generated by "weed scaffold -config=filer"

Supported Filer Stores:
`

	storeNames := make([]string, len(filer.Stores))
	for i, store := range filer.Stores {
		storeNames[i] = "\t" + store.GetName()
	}
	sort.Strings(storeNames)
	storeList := strings.Join(storeNames, "\n")
	return desc + storeList
}

var cmdFiler = &Command{
	UsageLine: "filer -port=8888 -master=<ip:port>[,<ip:port>]*",
	Short:     "start a file server that points to a master server, or a list of master servers",
	Long:      filerLongDesc(),
}

func runFiler(cmd *Command, args []string) bool {
	if *f.debug {
		go http.ListenAndServe(fmt.Sprintf(":%d", *f.debugPort), nil)
	}

	*f.defaultLevelDbDirectory = util.ResolvePath(*f.defaultLevelDbDirectory)
	filerS3Options.resolvePaths()
	filerWebDavOptions.resolvePaths()
	filerSftpOptions.resolvePaths()
	util.LoadSecurityConfiguration()

	// Share the S3 static identity config file with the filer regardless of
	// whether the embedded S3 gateway runs on this node: the IAM gRPC service
	// the admin UI and weed shell talk to is wired up unconditionally, and it
	// needs the same identities the S3 server would load from -s3.config.
	f.s3ConfigFile = filerS3Options.config

	switch {
	case *f.metricsHttpIp != "":
		// noting to do, use f.metricsHttpIp
	case *f.bindIp != "":
		*f.metricsHttpIp = *f.bindIp
	case *f.ip != "":
		*f.metricsHttpIp = *f.ip
	}
	go stats_collect.StartMetricsServer(*f.metricsHttpIp, *f.metricsHttpPort)

	filerAddress := pb.NewServerAddress(*f.ip, *f.port, *f.portGrpc).String()
	startDelay := time.Duration(2)
	if *filerStartS3 {
		filerS3Options.filer = &filerAddress
		filerS3Options.ip = f.ip
		if *filerS3Options.bindIp == "" {
			filerS3Options.bindIp = f.bindIp
		}
		filerS3Options.localFilerSocket = f.localSocket
		if *f.dataCenter != "" && *filerS3Options.dataCenter == "" {
			filerS3Options.dataCenter = f.dataCenter
		}
		// Set S3 metrics IP based on bind IP if not explicitly set
		if *filerS3Options.metricsHttpIp == "" {
			*filerS3Options.metricsHttpIp = *filerS3Options.bindIp
		}
		go func(delay time.Duration) {
			time.Sleep(delay * time.Second)
			filerS3Options.startS3Server()
		}(startDelay)
		startDelay++
	}

	if *filerStartWebDav {
		filerWebDavOptions.filer = &filerAddress
		filerWebDavOptions.ipBind = f.bindIp

		if *filerWebDavOptions.disk == "" {
			filerWebDavOptions.disk = f.diskType
		}

		go func(delay time.Duration) {
			time.Sleep(delay * time.Second)
			filerWebDavOptions.startWebDav()
		}(startDelay)
		startDelay++
	}

	if *filerStartIam {
		filerIamOptions.filer = &filerAddress
		filerIamOptions.masters = f.mastersString
		go func(delay time.Duration) {
			time.Sleep(delay * time.Second)
			filerIamOptions.startIamServer()
		}(startDelay)
		startDelay++
	}

	if *filerStartSftp {
		filerSftpOptions.filer = &filerAddress
		if *filerSftpOptions.bindIp == "" {
			filerSftpOptions.bindIp = f.bindIp
		}
		if *f.dataCenter != "" && *filerSftpOptions.dataCenter == "" {
			filerSftpOptions.dataCenter = f.dataCenter
		}
		go func(delay time.Duration) {
			time.Sleep(delay * time.Second)
			filerSftpOptions.startSftpServer()
		}(startDelay)
	}

	f.masters = pb.ServerAddresses(*f.mastersString).ToServiceDiscovery()

	f.startFiler()

	return true
}

func (fo *FilerOptions) startFiler() {

	defaultMux := http.NewServeMux()
	publicVolumeMux := defaultMux

	if *fo.publicPort != 0 {
		publicVolumeMux = http.NewServeMux()
	}
	if *fo.portGrpc == 0 {
		*fo.portGrpc = 10000 + *fo.port
	}
	if *fo.bindIp == "" {
		*fo.bindIp = *fo.ip
	}
	util.SetOutboundLocalIP(*fo.bindIp)
	if *fo.allowedOrigins == "" {
		*fo.allowedOrigins = "*"
	}

	defaultLevelDbDirectory := *fo.defaultLevelDbDirectory + "/filerldb2"

	filerAddress := pb.NewServerAddress(*fo.ip, *fo.port, *fo.portGrpc)

	// Initialize credential manager for IAM gRPC service
	var credentialManager *credential.CredentialManager
	var err error
	credentialManager, err = credential.NewCredentialManagerWithDefaults("")
	if err != nil {
		glog.Warningf("Failed to initialize credential manager: %v", err)
	} else {
		glog.V(0).Infof("Initialized credential manager: %s", credentialManager.GetStoreName())
	}

	// Load static S3 identities from config file if specified
	if fo.s3ConfigFile != nil && *fo.s3ConfigFile != "" {
		if credentialManager != nil {
			if err := credentialManager.LoadS3ConfigFile(*fo.s3ConfigFile); err != nil {
				glog.Warningf("Failed to load S3 config file for static identities: %v", err)
			}
		}
	}

	fs, nfs_err := weed_server.NewFilerServer(defaultMux, publicVolumeMux, &weed_server.FilerOption{
		Masters:                   fo.masters,
		FilerGroup:                *fo.filerGroup,
		Collection:                *fo.collection,
		DefaultReplication:        *fo.defaultReplicaPlacement,
		DisableDirListing:         *fo.disableDirListing,
		MaxMB:                     *fo.maxMB,
		DirListingLimit:           *fo.dirListingLimit,
		DataCenter:                *fo.dataCenter,
		Rack:                      *fo.rack,
		DefaultLevelDbDir:         defaultLevelDbDirectory,
		DisableHttp:               *fo.disableHttp,
		Host:                      filerAddress,
		Cipher:                    *fo.cipher,
		SaveToFilerLimit:          int64(*fo.saveToFilerLimit),
		ConcurrentUploadLimit:     int64(*fo.concurrentUploadLimitMB) * 1024 * 1024,
		ConcurrentFileUploadLimit: int64(*fo.concurrentFileUploadLimit),
		ShowUIDirectoryDelete:     *fo.showUIDirectoryDelete,
		DownloadMaxBytesPs:        int64(*fo.downloadMaxMBps) * 1024 * 1024,
		DiskType:                  *fo.diskType,
		AllowedOrigins:            strings.Split(*fo.allowedOrigins, ","),
		ExposeDirectoryData:       *fo.exposeDirectoryData,
		TusBasePath:               *fo.tusBasePath,
		TusMaxSize:                int64(*fo.tusMaxSizeMB) * 1024 * 1024,
		TusSessionExpiry:          *fo.tusSessionExpiry,
		CredentialManager:         credentialManager,
	})
	if nfs_err != nil {
		glog.Fatalf("Filer startup error: %v", nfs_err)
	}

	// Serve "//" and ".." paths at their cleaned form instead of letting the mux
	// redirect: its Location is double-escaped, turning non-ASCII names into
	// percent-encoded directory names when a client follows it (#11125).
	defaultHandler := weed_server.CleanPathHandler(defaultMux)

	// Ensure fs.Shutdown() runs exactly once, whether triggered by a signal hook
	// or by the main goroutine after Serve() returns (e.g., MiniCluster tests).
	var shutdownOnce sync.Once
	shutdownFiler := func() {
		shutdownOnce.Do(func() {
			fs.Shutdown()
		})
	}

	if *fo.publicPort != 0 {
		publicListeningAddress := util.JoinHostPort(*fo.bindIp, *fo.publicPort)
		glog.V(0).Infoln("Start Seaweed filer server", version.Version(), "public at", publicListeningAddress)
		publicListener, localPublicListener, e := util.NewIpAndLocalListeners(*fo.bindIp, *fo.publicPort, 0)
		if e != nil {
			glog.Fatalf("Filer server public listener error on port %d:%v", *fo.publicPort, e)
		}
		publicHandler := weed_server.CleanPathHandler(publicVolumeMux)
		go func() {
			if e := http.Serve(publicListener, publicHandler); e != nil {
				glog.Fatalf("Volume server fail to serve public: %v", e)
			}
		}()
		if localPublicListener != nil {
			go func() {
				if e := http.Serve(localPublicListener, publicHandler); e != nil {
					glog.Errorf("Volume server fail to serve public: %v", e)
				}
			}()
		}
	}

	glog.V(0).Infof("Start Seaweed Filer %s at %s:%d", version.Version(), *fo.ip, *fo.port)
	filerListener, filerLocalListener, e := util.NewIpAndLocalListeners(
		*fo.bindIp, *fo.port,
		time.Duration(10)*time.Second,
	)
	if e != nil {
		glog.Fatalf("Filer listener error: %v", e)
	}

	// starting grpc server
	grpcPort := *fo.portGrpc
	grpcL, grpcLocalL, err := util.NewIpAndLocalListeners(*fo.bindIp, grpcPort, 0)
	if err != nil {
		glog.Fatalf("failed to listen on grpc port %d: %v", grpcPort, err)
	}
	grpcS := pb.NewGrpcServer(security.LoadServerTLS(util.GetViper(), "grpc.filer"))
	filer_pb.RegisterSeaweedFilerServer(grpcS, fs)

	// Register the IAM gRPC service. Auth is opt-in: when
	// jwt.filer_signing.key is configured the service requires a Bearer token
	// signed with that key; otherwise it runs unauthenticated, matching the
	// rest of the filer's gRPC surface. Operators who expose the filer gRPC
	// port beyond a trusted network should set jwt.filer_signing.key on both
	// the filer and the admin server.
	if credentialManager != nil {
		adminSigningKey := security.SigningKey(util.GetViper().GetString("jwt.filer_signing.key"))
		iamGrpcServer := weed_server.NewIamGrpcServer(credentialManager, adminSigningKey)
		iam_pb.RegisterSeaweedIdentityAccessManagementServer(grpcS, iamGrpcServer)
		if len(adminSigningKey) == 0 {
			glog.V(0).Info("Registered IAM gRPC service on filer (unauthenticated; set jwt.filer_signing.key in security.toml to require admin Bearer token)")
		} else {
			glog.V(0).Info("Registered IAM gRPC service on filer (admin Bearer token required)")
		}
	}

	reflection.Register(grpcS)
	if grpcLocalL != nil {
		go grpcS.Serve(grpcLocalL)
	}
	go grpcS.Serve(grpcL)
	pb.ServeGrpcOnLocalSocket(grpcS, grpcPort)

	// Helper to gracefully stop the gRPC server, waiting for active RPCs.
	gracefulTimeout := fo.gracefulStopTimeout
	if gracefulTimeout <= 0 {
		gracefulTimeout = 10 * time.Second
	}
	stopGrpcServer := func() {
		glog.V(0).Infof("Gracefully stopping gRPC server")
		stopped := make(chan struct{})
		go func() {
			grpcS.GracefulStop()
			close(stopped)
		}()
		select {
		case <-stopped:
			glog.V(0).Infof("gRPC server stopped gracefully")
		case <-time.After(gracefulTimeout):
			glog.V(0).Infof("gRPC server graceful stop timed out after %s, forcing stop", gracefulTimeout)
			grpcS.Stop()
		}
	}

	var socketServer *http.Server
	if runtime.GOOS != "windows" {
		localSocket := *fo.localSocket
		if localSocket == "" {
			localSocket = fmt.Sprintf("/tmp/seaweedfs-filer-%d.sock", *fo.port)
		}
		if err := os.Remove(localSocket); err != nil && !os.IsNotExist(err) {
			glog.Fatalf("Failed to remove %s, error: %s", localSocket, err.Error())
		}
		filerSocketListener, err := net.Listen("unix", localSocket)
		if err != nil {
			glog.Fatalf("Failed to listen on %s: %v", localSocket, err)
		}
		socketServer = newHttpServer(defaultHandler, nil)
		go socketServer.Serve(filerSocketListener)
	}

	if viper.GetString("https.filer.key") != "" {
		certFile := viper.GetString("https.filer.cert")
		keyFile := viper.GetString("https.filer.key")
		caCertFile := viper.GetString("https.filer.ca")
		disbaleTlsVerifyClientCert := viper.GetBool("https.filer.disable_tls_verify_client_cert")

		getCert, certProvider, err := security.NewReloadingServerCertificate(certFile, keyFile)
		if err != nil {
			glog.Fatalf("Filer failed to load HTTPS certificate: %v", err)
		}
		defer certProvider.Close()

		caCertPool := x509.NewCertPool()
		if caCertFile != "" {
			caCertFile, err := os.ReadFile(caCertFile)
			if err != nil {
				glog.Fatalf("error reading CA certificate: %v", err)
			}
			caCertPool.AppendCertsFromPEM(caCertFile)
		}

		clientAuth := tls.NoClientCert
		if !disbaleTlsVerifyClientCert {
			clientAuth = tls.RequireAndVerifyClientCert
		}

		tlsConfig := &tls.Config{
			GetCertificate: getCert,
			ClientAuth:     clientAuth,
			ClientCAs:      caCertPool,
		}

		err = security.FixTlsConfig(util.GetViper(), tlsConfig)
		if err != nil {
			glog.Fatalf("Filer failed to fix TLS config: %v", err)
		}

		var localTLSServer *http.Server
		if filerLocalListener != nil {
			localTLSServer = newHttpServer(defaultHandler, tlsConfig)
			go func() {
				if err := localTLSServer.ServeTLS(filerLocalListener, "", ""); err != nil {
					glog.Errorf("Filer Fail to serve: %v", err)
				}
			}()
		}
		httpS := newHttpServer(defaultHandler, tlsConfig)

		// Register a single shutdown hook that runs the steps in the correct order:
		// stop accepting new gRPC/HTTP requests, then close the filer database.
		// Combining them into one hook keeps ordering intact regardless of how
		// grace fires interrupt hooks (FIFO vs LIFO).
		grace.OnInterrupt(func() {
			stopGrpcServer()
			glog.V(0).Infof("Gracefully stopping all HTTP servers")
			shutdownCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
			defer cancel()
			if socketServer != nil {
				err = socketServer.Shutdown(shutdownCtx)
				if err != nil {
					glog.Warningf("socket server shutdown: %v", err)
				}
			}
			if localTLSServer != nil {
				err = localTLSServer.Shutdown(shutdownCtx)
				if err != nil {
					glog.Warningf("local TLS server shutdown: %v", err)
				}
			}
			if err := httpS.Shutdown(shutdownCtx); err != nil {
				glog.Warningf("HTTPS server shutdown: %v", err)
			}
			shutdownFiler()
		})

		if fo.shutdownCtx != nil {
			go func() {
				<-fo.shutdownCtx.Done()
				httpS.Shutdown(context.Background())
				grpcS.Stop()
			}()
		}
		if err := httpS.ServeTLS(filerListener, "", ""); err != nil && err != http.ErrServerClosed {
			glog.Fatalf("Filer Fail to serve: %v", err)
		}
		// Close database after servers have stopped to prevent data corruption
		shutdownFiler()
	} else {
		var localHTTPServer *http.Server
		if filerLocalListener != nil {
			localHTTPServer = newHttpServer(defaultHandler, nil)
			go func() {
				if err := localHTTPServer.Serve(filerLocalListener); err != nil {
					glog.Errorf("Filer Fail to serve: %v", err)
				}
			}()
		}
		httpS := newHttpServer(defaultHandler, nil)

		// Register a single shutdown hook that runs the steps in the correct order:
		// stop accepting new gRPC/HTTP requests, then close the filer database.
		// Combining them into one hook keeps ordering intact regardless of how
		// grace fires interrupt hooks (FIFO vs LIFO).
		grace.OnInterrupt(func() {
			stopGrpcServer()
			glog.V(0).Infof("Gracefully stopping all HTTP servers")
			shutdownCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
			defer cancel()
			if socketServer != nil {
				socketServer.Shutdown(shutdownCtx)
			}
			if localHTTPServer != nil {
				localHTTPServer.Shutdown(shutdownCtx)
			}
			if err := httpS.Shutdown(shutdownCtx); err != nil {
				glog.Warningf("HTTP server shutdown: %v", err)
			}
			shutdownFiler()
		})

		if fo.shutdownCtx != nil {
			go func() {
				<-fo.shutdownCtx.Done()
				httpS.Shutdown(context.Background())
				grpcS.Stop()
			}()
		}
		if err := httpS.Serve(filerListener); err != nil && err != http.ErrServerClosed {
			glog.Fatalf("Filer Fail to serve: %v", err)
		}
		// Close database after servers have stopped to prevent data corruption
		shutdownFiler()
	}
}
