完善 cache 相关内容

pkg/core/meta.go

@@ -0,0 +1,118 @@
+package core
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"code.d7z.net/d7z-project/gitea-pages/pkg/utils"
+)
+
+type ServerMeta struct {
+	client  *http.Client
+	backend Backend
+	cache   utils.Config
+	ttl     time.Duration
+}
+
+type PageMeta struct {
+	CommitID         string `json:"commit_id"`     // 提交 COMMIT ID
+	IsPage           bool   `json:"is_page"`       // 是否为 Page
+	Domain           string `json:"domain"`        // 匹配的域名和路径
+	HistoryRouteMode bool   `json:"route_history"` // 路由模式
+}
+
+func NewServerMeta(client *http.Client, backend Backend, config utils.Config, ttl time.Duration) *ServerMeta {
+	return &ServerMeta{client, backend, config, ttl}
+}
+
+func (s *ServerMeta) Meta(owner, repo, branch string) (*PageMeta, error) {
+	rel := &PageMeta{
+		IsPage: false,
+	}
+	key := fmt.Sprintf("meta/%s/%s/%s", owner, repo, branch)
+	pushMeta := func() error {
+		data, err := json.Marshal(rel)
+		if err != nil {
+			return err
+		}
+		return s.cache.Put(key, string(data), s.ttl)
+	}
+
+	cache, err := s.cache.Get(key)
+	if err != nil {
+		if !errors.Is(err, os.ErrNotExist) {
+			return nil, err
+		}
+	} else {
+		if err = json.Unmarshal([]byte(cache), rel); err == nil {
+			return rel, nil
+		}
+	}
+	repos, err := s.backend.Repos(owner)
+	if err != nil {
+		return nil, err
+	}
+	rel.CommitID = repos[repo]
+	if rel.CommitID == "" {
+		_ = pushMeta()
+		return nil, os.ErrNotExist
+	}
+	if branch != "" {
+		branches, err := s.backend.Branches(owner, repo)
+		if err != nil {
+			return nil, err
+		}
+		rel.CommitID = branches[branch]
+	}
+	if rel.CommitID == "" {
+		_ = pushMeta()
+		return nil, os.ErrNotExist
+	}
+	if cname, err := s.ReadString(owner, repo, rel.CommitID, "CNAME"); err != nil && !errors.Is(err, os.ErrNotExist) {
+		return nil, err
+	} else {
+		rel.Domain = strings.TrimSpace(cname)
+	}
+	if find, _ := s.FileExists(owner, repo, rel.CommitID, "index.html"); find {
+		rel.IsPage = true
+	}
+	if find, _ := s.FileExists(owner, repo, rel.CommitID, ".history-mode"); find {
+		rel.HistoryRouteMode = true
+	}
+	_ = pushMeta()
+	return rel, nil
+}
+
+func (s *ServerMeta) ReadString(owner, repo, branch, path string) (string, error) {
+	resp, err := s.backend.Open(s.client, owner, repo, branch, path, nil)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return "", os.ErrNotExist
+	}
+	all, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+	return string(all), nil
+}
+
+func (s *ServerMeta) FileExists(owner, repo, branch, path string) (bool, error) {
+	resp, err := s.backend.Open(s.client, owner, repo, branch, path, nil)
+	if err != nil {
+		return false, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode == http.StatusOK {
+		return true, nil
+	}
+	return false, nil
+}