Lemon-miaow
109701a276
迁移 CLI 不再遮蔽 BeginMigration 的错误，拒绝启动时正确返回失败。规范节点批准错误文案和归档 HTTP 状态常量；tar.Reader 已将旧普通文件类型归一化，无需引用已弃用常量。 验证：CI 固定版本 staticcheck 全量通过；cmd/felis、archivetransfer、backup、distributed 的 go test -race 通过。
574 lines
16 KiB
Go
574 lines
16 KiB
Go
// Package archivetransfer serves archive bytes on A. It has no Kubernetes or database access.
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package archivetransfer
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import (
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"context"
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"os"
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"path/filepath"
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"regexp"
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"strings"
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"sync"
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"syscall"
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"time"
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"felis.lolicon.best/internal/backup"
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"felis.lolicon.best/internal/naming"
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"felis.lolicon.best/internal/worldexport"
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)
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const TokenEnv = "FELIS_ARCHIVE_TOKEN"
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const KeyEnv = "FELIS_ARCHIVE_KEY"
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const LabelPending = "felis.lolicon.best/archive-pending"
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const Annotation = "felis.lolicon.best/archive-transfer"
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const DefaultLimit int64 = 100 << 30
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var idRE = regexp.MustCompile(`^[a-f0-9]{32}$`)
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// Ticket names exactly one operation, server and archive. Only A holds the signing key.
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type Ticket struct {
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ID string `json:"id"`
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Server string `json:"server"`
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Method string `json:"method"`
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Ref string `json:"ref"`
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SHA256 string `json:"sha256,omitempty"`
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Limit int64 `json:"limit"`
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Expires time.Time `json:"expires"`
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}
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type Receipt struct {
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Ref string `json:"ref"`
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Size int64 `json:"size"`
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SHA256 string `json:"sha256"`
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}
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type Client struct {
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URL, Root, Key string
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Limit int64
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}
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func ID() string {
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var b [16]byte
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if _, err := rand.Read(b[:]); err != nil {
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panic(err)
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}
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return hex.EncodeToString(b[:])
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}
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func (c Client) Issue(server, method, ref, sum string, ttl time.Duration) (Ticket, string, string, error) {
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if len(c.Key) < 32 || c.URL == "" || ttl <= 0 || ttl > 24*time.Hour {
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return Ticket{}, "", "", errors.New("archive transport is not configured or ticket lifetime is invalid")
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}
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id := ID()
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if method == http.MethodPut {
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ref = filepath.Join(c.Root, fmt.Sprintf("%s-%d.tar.gz", server, time.Now().UnixNano()))
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}
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limit := c.Limit
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if limit <= 0 {
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limit = DefaultLimit
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}
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t := Ticket{ID: id, Server: server, Method: method, Ref: ref, SHA256: sum, Limit: limit, Expires: time.Now().Add(ttl)}
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if err := validate(t, c.Root, limit); err != nil {
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return Ticket{}, "", "", err
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}
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raw, _ := json.Marshal(t)
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payload := base64.RawURLEncoding.EncodeToString(raw)
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mac := hmac.New(sha256.New, []byte(c.Key))
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mac.Write([]byte(payload))
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token := payload + "." + base64.RawURLEncoding.EncodeToString(mac.Sum(nil))
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return t, strings.TrimRight(c.URL, "/") + "/transfers/" + id, token, nil
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}
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func validate(t Ticket, root string, limit int64) error {
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if !idRE.MatchString(t.ID) || t.Limit <= 0 || t.Limit > limit {
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return errors.New("invalid transfer bounds")
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}
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if err := naming.ValidateSystemServerName(t.Server); err != nil {
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return err
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}
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if t.Method != http.MethodPut && t.Method != http.MethodGet {
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return errors.New("invalid transfer operation")
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}
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if !filepath.IsAbs(root) || filepath.Dir(t.Ref) != filepath.Clean(root) || !strings.HasSuffix(t.Ref, ".tar.gz") {
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return errors.New("archive must be directly inside the archive root")
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}
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if !strings.HasPrefix(filepath.Base(t.Ref), t.Server+"-") {
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return errors.New("archive belongs to another server")
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}
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if t.SHA256 != "" {
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b, err := hex.DecodeString(t.SHA256)
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if err != nil || len(b) != sha256.Size {
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return errors.New("invalid SHA-256")
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}
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}
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return nil
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}
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// Server journals consumption before IO, so process restarts cannot enable replay.
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// A failure consumes the ticket too: the controller issues a fresh ticket on retry.
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type Server struct {
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Root, Key string
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Limit int64
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mu sync.Mutex
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freeBytes func() (int64, error)
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}
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func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/healthz" && r.Method == http.MethodGet {
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w.WriteHeader(http.StatusNoContent)
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return
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}
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if r.URL.Path == "/archives" && r.Method == http.MethodDelete {
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if len(s.Key) < 32 || !hmac.Equal([]byte(strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")), []byte(s.Key)) {
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http.Error(w, "unauthorized", http.StatusUnauthorized)
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return
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}
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var q struct {
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Ref string `json:"ref"`
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}
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if json.NewDecoder(io.LimitReader(r.Body, 4096)).Decode(&q) != nil || filepath.Dir(q.Ref) != filepath.Clean(s.Root) {
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http.Error(w, "bad ref", 400)
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return
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}
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if err := os.Remove(q.Ref); err != nil && !errors.Is(err, os.ErrNotExist) {
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http.Error(w, "archive delete failed", 500)
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return
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}
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if err := syncDir(s.Root); err != nil {
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http.Error(w, "archive delete commit failed", 500)
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return
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}
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w.WriteHeader(204)
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return
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}
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if r.URL.Path == "/inspect" && r.Method == http.MethodPost {
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if len(s.Key) < 32 || !hmac.Equal([]byte(strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")), []byte(s.Key)) {
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http.Error(w, "unauthorized", http.StatusUnauthorized)
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return
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}
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var q struct {
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Ref string `json:"ref"`
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}
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if json.NewDecoder(io.LimitReader(r.Body, 4096)).Decode(&q) != nil || filepath.Dir(q.Ref) != filepath.Clean(s.Root) {
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http.Error(w, "bad archive ref", 400)
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return
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}
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local := &backup.TarLocal{BackupRoot: s.Root}
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sum, err := local.Verify(r.Context(), backup.ArchiveRef(q.Ref), "")
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if err != nil {
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http.Error(w, "archive is absent or corrupt", http.StatusUnprocessableEntity)
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return
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}
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st, err := os.Stat(q.Ref)
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if err != nil {
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http.Error(w, "archive absent", 404)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(Receipt{Ref: q.Ref, SHA256: sum, Size: st.Size()})
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return
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}
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if strings.HasPrefix(r.URL.Path, "/receipts/") && r.Method == http.MethodGet {
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if len(s.Key) < 32 || !hmac.Equal([]byte(strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")), []byte(s.Key)) {
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http.Error(w, "unauthorized", http.StatusUnauthorized)
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return
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}
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id := strings.TrimPrefix(r.URL.Path, "/receipts/")
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if !idRE.MatchString(id) {
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http.NotFound(w, r)
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return
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}
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rec, err := s.receipt(r.Context(), id)
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if err != nil {
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http.NotFound(w, r)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(rec)
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return
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}
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token := strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")
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payload, signature, ok := strings.Cut(token, ".")
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mac := hmac.New(sha256.New, []byte(s.Key))
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mac.Write([]byte(payload))
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sig, err := base64.RawURLEncoding.DecodeString(signature)
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if !ok || err != nil || len(s.Key) < 32 || !hmac.Equal(sig, mac.Sum(nil)) {
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http.Error(w, "unauthorized", http.StatusUnauthorized)
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return
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}
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raw, err := base64.RawURLEncoding.DecodeString(payload)
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var t Ticket
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limit := s.Limit
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if limit <= 0 {
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limit = DefaultLimit
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}
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if err != nil || json.Unmarshal(raw, &t) != nil || validate(t, s.Root, limit) != nil || time.Now().After(t.Expires) || t.Expires.After(time.Now().Add(24*time.Hour)) || t.Method != r.Method || r.URL.Path != "/transfers/"+t.ID {
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http.Error(w, "invalid or expired transfer", http.StatusForbidden)
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return
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}
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if err := s.consume(t); err != nil {
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if errors.Is(err, os.ErrExist) {
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http.Error(w, "transfer already consumed", http.StatusConflict)
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} else {
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http.Error(w, "cannot journal transfer", http.StatusInsufficientStorage)
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}
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return
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}
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if t.Method == http.MethodGet {
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s.download(w, r, t)
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return
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}
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// Serialize uploads and disk checks to preserve a free-space reserve.
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s.mu.Lock()
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defer s.mu.Unlock()
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if err := s.upload(r, t); err != nil {
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http.Error(w, "archive upload failed: "+err.Error(), http.StatusUnprocessableEntity)
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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func syncDir(path string) error {
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f, err := os.Open(path)
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if err != nil {
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return err
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}
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defer f.Close()
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return f.Sync()
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}
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func (s *Server) consume(t Ticket) error {
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id := t.ID
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dir := filepath.Join(s.Root, ".transfers")
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if err := os.MkdirAll(dir, 0700); err != nil {
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return err
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}
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f, err := os.OpenFile(filepath.Join(dir, id+".used"), os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
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if err != nil {
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return err
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}
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raw, _ := json.Marshal(t)
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_, err = f.Write(raw)
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if err == nil {
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err = f.Sync()
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}
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cerr := f.Close()
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if err != nil {
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return err
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}
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if cerr != nil {
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return cerr
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}
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return syncDir(dir)
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}
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func (s *Server) upload(r *http.Request, t Ticket) error {
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available, err := s.availableBytes()
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if err != nil {
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return err
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}
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bound := min(t.Limit, available)
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if bound <= 0 {
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return backup.ErrNoRoom
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}
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tmp := filepath.Join(s.Root, "."+filepath.Base(t.Ref)+".partial")
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f, err := os.OpenFile(tmp, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
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if err != nil {
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return err
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}
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defer os.Remove(tmp)
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hash := sha256.New()
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n, err := io.Copy(io.MultiWriter(f, hash), io.LimitReader(r.Body, bound+1))
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if err == nil && n > bound {
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err = errors.New("archive exceeds size or disk limit")
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}
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digest := "sha-256=:" + base64.StdEncoding.EncodeToString(hash.Sum(nil)) + ":"
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if err == nil && r.Trailer.Get(worldexport.DigestTrailer) != digest {
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err = errors.New("SHA-256 trailer is absent or incorrect")
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}
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sum := hex.EncodeToString(hash.Sum(nil))
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if err == nil && t.SHA256 != "" && t.SHA256 != sum {
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err = errors.New("SHA-256 does not match ticket")
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}
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if err == nil {
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err = f.Sync()
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}
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cerr := f.Close()
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if err == nil {
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err = cerr
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}
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if err != nil {
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return err
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}
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local := &backup.TarLocal{BackupRoot: s.Root}
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if _, err = local.Verify(r.Context(), backup.ArchiveRef(tmp), sum); err != nil {
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return err
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}
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// Never overwrite a committed archive, including one whose receipt was interrupted.
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if err = os.Link(tmp, t.Ref); err != nil {
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return err
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}
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if err = os.Remove(tmp); err != nil {
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return err
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}
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if err = syncDir(s.Root); err != nil {
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return err
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}
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rec := Receipt{Ref: t.Ref, Size: n, SHA256: sum}
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raw, _ := json.Marshal(rec)
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journal := filepath.Join(s.Root, ".transfers", t.ID+".json")
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f, err = os.OpenFile(journal, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
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if err != nil {
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return err
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}
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_, err = f.Write(raw)
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if err == nil {
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err = f.Sync()
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}
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cerr = f.Close()
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if err == nil {
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err = cerr
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}
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if err != nil {
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return err
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}
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return syncDir(filepath.Dir(journal))
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}
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func (s *Server) download(w http.ResponseWriter, r *http.Request, t Ticket) {
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root, err := os.OpenRoot(s.Root)
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if err != nil {
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http.Error(w, "archive unavailable", http.StatusServiceUnavailable)
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return
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}
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defer root.Close()
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f, err := root.Open(filepath.Base(t.Ref))
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if err != nil {
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http.NotFound(w, r)
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return
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}
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defer f.Close()
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st, err := f.Stat()
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if err != nil || !st.Mode().IsRegular() || st.Size() > t.Limit {
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http.Error(w, "archive exceeds transfer bounds", http.StatusRequestEntityTooLarge)
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return
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}
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w.Header().Set("Content-Type", "application/gzip")
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w.Header().Set("Content-Length", fmt.Sprint(st.Size()))
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io.Copy(w, f)
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}
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func (c Client) Receipt(ctx context.Context, id string) (Receipt, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, strings.TrimRight(c.URL, "/")+"/receipts/"+id, nil)
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if err != nil {
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return Receipt{}, err
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}
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req.Header.Set("Authorization", "Bearer "+c.Key)
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hc := &http.Client{Timeout: 15 * time.Second, CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse }}
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resp, err := hc.Do(req)
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if err != nil {
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return Receipt{}, err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return Receipt{}, fmt.Errorf("archive receipt: %s", resp.Status)
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}
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var rec Receipt
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err = json.NewDecoder(io.LimitReader(resp.Body, 4096)).Decode(&rec)
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return rec, err
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}
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// Fetch stages only the authorized archive and verifies its hash before extraction.
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func Fetch(ctx context.Context, url, token, dest, want string, limit int64) error {
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if want == "" {
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return errors.New("download requires recorded SHA-256")
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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return err
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}
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req.Header.Set("Authorization", "Bearer "+token)
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hc := &http.Client{CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse }}
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resp, err := hc.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return fmt.Errorf("archive download: %s", resp.Status)
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}
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f, err := os.OpenFile(dest, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
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if err != nil {
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return err
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}
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hash := sha256.New()
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n, err := io.Copy(io.MultiWriter(f, hash), io.LimitReader(resp.Body, limit+1))
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if err == nil && (n > limit || hex.EncodeToString(hash.Sum(nil)) != want) {
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err = errors.New("archive size or SHA-256 mismatch")
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}
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if err == nil {
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err = f.Sync()
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}
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cerr := f.Close()
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if err == nil {
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err = cerr
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}
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if err != nil {
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os.Remove(dest)
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}
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return err
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}
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func (c Client) Inspect(ctx context.Context, ref string) (Receipt, error) {
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raw, _ := json.Marshal(map[string]string{"ref": ref})
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, strings.TrimRight(c.URL, "/")+"/inspect", strings.NewReader(string(raw)))
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if err != nil {
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return Receipt{}, err
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}
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req.Header.Set("Authorization", "Bearer "+c.Key)
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hc := &http.Client{Timeout: 30 * time.Minute, CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse }}
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resp, err := hc.Do(req)
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if err != nil {
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return Receipt{}, err
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return Receipt{}, fmt.Errorf("archive inspect: %s", resp.Status)
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}
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var rec Receipt
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err = json.NewDecoder(io.LimitReader(resp.Body, 4096)).Decode(&rec)
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return rec, err
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}
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func (c Client) Delete(ctx context.Context, ref backup.ArchiveRef) error {
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raw, _ := json.Marshal(map[string]string{"ref": string(ref)})
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req, err := http.NewRequestWithContext(ctx, http.MethodDelete, strings.TrimRight(c.URL, "/")+"/archives", strings.NewReader(string(raw)))
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if err != nil {
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return err
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}
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req.Header.Set("Authorization", "Bearer "+c.Key)
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hc := &http.Client{Timeout: 15 * time.Second, CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse }}
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resp, err := hc.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != 204 && resp.StatusCode != 404 {
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return fmt.Errorf("archive delete: %s", resp.Status)
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}
|
|
return nil
|
|
}
|
|
|
|
func (s *Server) receipt(ctx context.Context, id string) (Receipt, error) {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
path := filepath.Join(s.Root, ".transfers", id+".json")
|
|
var rec Receipt
|
|
if raw, err := os.ReadFile(path); err == nil && json.Unmarshal(raw, &rec) == nil {
|
|
return rec, nil
|
|
}
|
|
raw, err := os.ReadFile(filepath.Join(s.Root, ".transfers", id+".used"))
|
|
if err != nil {
|
|
return rec, err
|
|
}
|
|
var t Ticket
|
|
if err = json.Unmarshal(raw, &t); err != nil {
|
|
return rec, err
|
|
}
|
|
if t.Method != http.MethodPut {
|
|
return rec, errors.New("not an upload")
|
|
}
|
|
sum, err := (&backup.TarLocal{BackupRoot: s.Root}).Verify(ctx, backup.ArchiveRef(t.Ref), t.SHA256)
|
|
if err != nil {
|
|
return rec, err
|
|
}
|
|
st, err := os.Stat(t.Ref)
|
|
if err != nil || st.Size() > t.Limit {
|
|
return rec, errors.New("invalid committed archive")
|
|
}
|
|
rec = Receipt{Ref: t.Ref, Size: st.Size(), SHA256: sum}
|
|
raw, _ = json.Marshal(rec)
|
|
tmp := path + ".partial"
|
|
f, err := os.OpenFile(tmp, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
|
|
if err != nil {
|
|
return rec, err
|
|
}
|
|
_, err = f.Write(raw)
|
|
if err == nil {
|
|
err = f.Sync()
|
|
}
|
|
cerr := f.Close()
|
|
if err == nil {
|
|
err = cerr
|
|
}
|
|
if err != nil {
|
|
return rec, err
|
|
}
|
|
if err = os.Rename(tmp, path); err != nil {
|
|
return rec, err
|
|
}
|
|
return rec, syncDir(filepath.Dir(path))
|
|
}
|
|
|
|
func (s *Server) availableBytes() (int64, error) {
|
|
if s.freeBytes != nil {
|
|
return s.freeBytes()
|
|
}
|
|
var st syscall.Statfs_t
|
|
if err := syscall.Statfs(s.Root, &st); err != nil {
|
|
return 0, err
|
|
}
|
|
return int64(st.Bavail)*int64(st.Bsize) - int64(float64(st.Blocks)*float64(st.Bsize)*backup.MinFreeAfter), nil
|
|
}
|
|
|
|
// Sweep keeps receipts for committed archives across arbitrarily long A outages.
|
|
// Expired failed transfers and downloads need no replay journal: signature expiry
|
|
// still rejects them. The extra day leaves no overlap with an active upload.
|
|
func (s *Server) Sweep(now time.Time) error {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
dir := filepath.Join(s.Root, ".transfers")
|
|
entries, err := os.ReadDir(dir)
|
|
if errors.Is(err, os.ErrNotExist) {
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, e := range entries {
|
|
if !strings.HasSuffix(e.Name(), ".used") {
|
|
continue
|
|
}
|
|
raw, err := os.ReadFile(filepath.Join(dir, e.Name()))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var ticket Ticket
|
|
if json.Unmarshal(raw, &ticket) != nil || now.Before(ticket.Expires.Add(24*time.Hour)) {
|
|
continue
|
|
}
|
|
if ticket.Method == http.MethodPut {
|
|
if _, err := os.Stat(ticket.Ref); err == nil {
|
|
continue
|
|
} else if !errors.Is(err, os.ErrNotExist) {
|
|
return err
|
|
}
|
|
}
|
|
for _, name := range []string{e.Name(), ticket.ID + ".json", ticket.ID + ".json.partial"} {
|
|
if err := os.Remove(filepath.Join(dir, name)); err != nil && !errors.Is(err, os.ErrNotExist) {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return syncDir(dir)
|
|
}
|