306 lines
8.0 KiB
Go
306 lines
8.0 KiB
Go
package updater
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"log/slog"
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"net"
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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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"time"
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)
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var ErrBusy = errors.New("升级任务正在进行中")
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var serviceNamePattern = regexp.MustCompile(`^[a-zA-Z0-9_.-]+$`)
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// Config 是 fonu-updater sidecar 的运行配置。
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type Config struct {
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SocketPath string
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ProjectDir string
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ComposeFile string
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Service string
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Mode string
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RepoURL string
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Branch string
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AppURL string
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BuildTimeout time.Duration
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HealthTimeout time.Duration
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}
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type Server struct {
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cfg Config
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logger *slog.Logger
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composePath string
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mu sync.Mutex
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state Status
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lastChecked time.Time
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}
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// NewServer 校验 sidecar 配置；参数不正确时拒绝启动。
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func NewServer(cfg Config, logger *slog.Logger) (*Server, error) {
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cfg.SocketPath = strings.TrimSpace(cfg.SocketPath)
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if cfg.SocketPath == "" {
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cfg.SocketPath = "/run/fonu-updater/updater.sock"
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}
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if strings.TrimSpace(cfg.ProjectDir) == "" {
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cfg.ProjectDir = "/workspace"
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}
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if strings.TrimSpace(cfg.ComposeFile) == "" {
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cfg.ComposeFile = "docker-compose.yml"
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}
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if strings.TrimSpace(cfg.Service) == "" {
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cfg.Service = "fonu"
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}
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if strings.TrimSpace(cfg.Mode) == "" {
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cfg.Mode = "local"
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}
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if strings.TrimSpace(cfg.Branch) == "" {
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cfg.Branch = "main"
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}
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if strings.TrimSpace(cfg.AppURL) == "" {
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cfg.AppURL = "http://fonu:6893"
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}
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if cfg.BuildTimeout <= 0 {
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cfg.BuildTimeout = 30 * time.Minute
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}
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if cfg.HealthTimeout <= 0 {
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cfg.HealthTimeout = 3 * time.Minute
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}
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if cfg.Mode != "local" && cfg.Mode != "git" {
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return nil, fmt.Errorf("FONU_UPDATE_MODE 只支持 local 或 git")
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}
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if !serviceNamePattern.MatchString(cfg.Service) {
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return nil, fmt.Errorf("FONU_UPDATE_SERVICE 含非法字符")
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}
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composePath, err := resolveComposePath(cfg.ProjectDir, cfg.ComposeFile)
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if err != nil {
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return nil, err
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}
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if cfg.Mode == "git" && strings.TrimSpace(cfg.RepoURL) == "" {
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return nil, fmt.Errorf("git 模式必须设置 FONU_UPDATE_REPO")
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}
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if logger == nil {
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logger = slog.Default()
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}
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return &Server{
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cfg: cfg,
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logger: logger,
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composePath: composePath,
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state: Status{
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Enabled: true,
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Mode: cfg.Mode,
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Phase: PhaseIdle,
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Message: "尚未检查更新",
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},
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}, nil
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}
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func (s *Server) Handler() http.Handler {
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mux := http.NewServeMux()
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mux.HandleFunc("GET /status", s.handleStatus)
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mux.HandleFunc("POST /apply", s.handleApply)
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return mux
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}
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// Serve 在共享 Unix Socket 上提供服务。
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func (s *Server) Serve(ctx context.Context) error {
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if err := os.MkdirAll(filepath.Dir(s.cfg.SocketPath), 0o750); err != nil {
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return err
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}
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_ = os.Remove(s.cfg.SocketPath)
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listener, err := net.Listen("unix", s.cfg.SocketPath)
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if err != nil {
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return err
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}
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defer func() {
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_ = listener.Close()
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_ = os.Remove(s.cfg.SocketPath)
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}()
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_ = os.Chmod(s.cfg.SocketPath, 0o660)
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server := &http.Server{
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Handler: s.Handler(),
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ReadHeaderTimeout: 5 * time.Second,
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ReadTimeout: 30 * time.Second,
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WriteTimeout: 30 * time.Second,
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}
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go func() {
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<-ctx.Done()
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shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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_ = server.Shutdown(shutdownCtx)
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}()
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err = server.Serve(listener)
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if errors.Is(err, http.ErrServerClosed) {
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return nil
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}
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return err
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}
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func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) {
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writeJSON(w, http.StatusOK, s.Status(r.Context()))
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}
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func (s *Server) handleApply(w http.ResponseWriter, r *http.Request) {
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status, err := s.Apply(r.Context())
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if errors.Is(err, ErrBusy) {
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writeJSON(w, http.StatusConflict, status)
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return
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}
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if err != nil {
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writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
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return
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}
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writeJSON(w, http.StatusAccepted, status)
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}
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func (s *Server) ensureComposeFile() error {
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info, err := os.Stat(s.composePath)
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if err != nil {
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return fmt.Errorf("找不到 Compose 文件 %s；请确认 updater 的 /workspace 挂载，或在 .env 设置 FONU_UPDATE_HOST_DIR 指向 Compose 所在目录", s.composePath)
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}
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if info.IsDir() {
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return fmt.Errorf("Compose 路径是目录而不是文件：%s", s.composePath)
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}
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return nil
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}
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// Status 返回当前版本、远端版本和任务状态。
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func (s *Server) Status(ctx context.Context) Status {
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s.mu.Lock()
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if busyPhase(s.state.Phase) {
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status := cloneStatus(s.state)
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s.mu.Unlock()
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return status
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}
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s.mu.Unlock()
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if err := s.ensureComposeFile(); err != nil {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.state.UpdateAvailable = false
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s.state.Message = err.Error()
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s.state.CheckedAt = time.Now().UTC().Format(time.RFC3339)
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return cloneStatus(s.state)
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}
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s.mu.Lock()
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if !s.lastChecked.IsZero() && time.Since(s.lastChecked) < time.Minute {
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status := cloneStatus(s.state)
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s.mu.Unlock()
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return status
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}
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s.mu.Unlock()
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checkCtx, cancel := context.WithTimeout(ctx, 20*time.Second)
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defer cancel()
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current, currentErr := readCurrentVersion(checkCtx, s.cfg.AppURL)
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latest, latestErr := s.latestVersion(checkCtx)
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s.mu.Lock()
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defer s.mu.Unlock()
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s.lastChecked = time.Now()
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s.state.CurrentVersion = current
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s.state.LatestVersion = latest
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s.state.UpdateAvailable = latest != "" && current != "" && CompareVersions(latest, current) > 0
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s.state.CheckedAt = time.Now().UTC().Format(time.RFC3339)
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switch {
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case currentErr != nil:
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s.state.Message = "无法读取当前运行版本：" + currentErr.Error()
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case latestErr != nil:
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s.state.Message = "无法读取远端最新版本：" + latestErr.Error()
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case s.state.UpdateAvailable:
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s.state.Message = fmt.Sprintf("发现新版本 %s，当前 %s", latest, current)
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default:
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s.state.Message = "当前已是最新版本"
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}
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return cloneStatus(s.state)
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}
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// Apply 立即返回排队状态，后台完成构建、重建、健康检查和必要回滚。
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func (s *Server) Apply(_ context.Context) (Status, error) {
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s.mu.Lock()
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if busyPhase(s.state.Phase) {
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status := cloneStatus(s.state)
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s.mu.Unlock()
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return status, ErrBusy
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}
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s.state.Phase = PhaseScheduled
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s.state.Busy = true
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s.state.Message = "升级任务已排队，即将重启 Fonu"
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s.state.Log = []string{"升级任务已排队"}
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status := cloneStatus(s.state)
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s.mu.Unlock()
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go s.runScheduled()
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return status, nil
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}
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func (s *Server) runScheduled() {
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time.Sleep(2 * time.Second)
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if err := s.runUpdate(context.Background()); err != nil {
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s.logf("升级失败：%v", err)
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s.finish(PhaseFailed, err.Error())
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return
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}
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s.finish(PhaseSuccess, "升级完成")
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}
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func (s *Server) finish(phase Phase, message string) {
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s.mu.Lock()
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s.state.Phase = phase
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s.state.Busy = false
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s.state.Message = message
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s.lastChecked = time.Time{}
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s.mu.Unlock()
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}
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func (s *Server) logf(format string, args ...any) {
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line := fmt.Sprintf(format, args...)
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s.logger.Info(line, "module", "UPDATER")
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s.mu.Lock()
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s.state.Log = append(s.state.Log, line)
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if len(s.state.Log) > 200 {
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s.state.Log = s.state.Log[len(s.state.Log)-200:]
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}
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s.mu.Unlock()
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}
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func cloneStatus(status Status) Status {
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status.Log = append([]string(nil), status.Log...)
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return status
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}
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func resolveComposePath(projectDir, composeFile string) (string, error) {
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dir, err := filepath.Abs(strings.TrimSpace(projectDir))
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if err != nil {
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return "", err
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}
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path := strings.TrimSpace(composeFile)
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if !filepath.IsAbs(path) {
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path = filepath.Join(dir, path)
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}
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path = filepath.Clean(path)
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rel, err := filepath.Rel(dir, path)
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if err != nil || rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
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return "", fmt.Errorf("compose 文件必须位于项目目录内")
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}
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switch filepath.Base(path) {
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case "docker-compose.yml", "docker-compose.hub.yml", "docker-compose.host.yml":
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return path, nil
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default:
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return "", fmt.Errorf("不支持的 compose 文件：%s", filepath.Base(path))
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}
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}
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func writeJSON(w http.ResponseWriter, status int, value any) {
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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w.WriteHeader(status)
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_ = json.NewEncoder(w).Encode(value)
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}
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