add backoffice and move stuff

cmd/backoffice/fileserver.go

@@ -0,0 +1,149 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+type FileServer struct {
+	// Define fields here
+	dataDir string
+}
+
+func NewFileServer(dataDir string) *FileServer {
+	return &FileServer{
+		dataDir: dataDir,
+	}
+}
+
+func listCartFiles(dir string) ([]CartFileInfo, error) {
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return []CartFileInfo{}, nil
+		}
+		return nil, err
+	}
+	out := make([]CartFileInfo, 0)
+	for _, e := range entries {
+		if e.IsDir() {
+			continue
+		}
+		name := e.Name()
+		m := cartFileRe.FindStringSubmatch(name)
+		if m == nil {
+			continue
+		}
+		idStr := m[1]
+		id, err := strconv.ParseUint(idStr, 10, 64)
+		if err != nil {
+			continue
+		}
+		p := filepath.Join(dir, name)
+		info, err := e.Info()
+		if err != nil {
+			continue
+		}
+		out = append(out, CartFileInfo{
+			ID:       id,
+			Path:     p,
+			Size:     info.Size(),
+			Modified: info.ModTime(),
+		})
+	}
+	return out, nil
+}
+
+func readRawLogLines(path string) ([]string, error) {
+	fh, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer fh.Close()
+	lines := make([]string, 0, 64)
+	s := bufio.NewScanner(fh)
+	// increase buffer to handle larger JSON lines
+	buf := make([]byte, 0, 1024*1024)
+	s.Buffer(buf, 1024*1024)
+	for s.Scan() {
+		line := strings.TrimSpace(s.Text())
+		if line == "" {
+			continue
+		}
+		lines = append(lines, line)
+	}
+	if err := s.Err(); err != nil {
+		return nil, err
+	}
+	return lines, nil
+}
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Cache-Control", "no-cache")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}
+
+func (fs *FileServer) CartsHandler(w http.ResponseWriter, r *http.Request) {
+	list, err := listCartFiles(fs.dataDir)
+	if err != nil {
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+		return
+	}
+	// sort by modified desc
+	sort.Slice(list, func(i, j int) bool { return list[i].Modified.After(list[j].Modified) })
+	writeJSON(w, http.StatusOK, map[string]any{
+		"count": len(list),
+		"carts": list,
+	})
+}
+
+func (fs *FileServer) CartHandler(w http.ResponseWriter, r *http.Request) {
+	idStr := r.PathValue("id")
+	if idStr == "" {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "missing id"})
+		return
+	}
+	// allow both decimal id and filename-like with suffix
+	if strings.HasSuffix(idStr, ".events.log") {
+		idStr = strings.TrimSuffix(idStr, ".events.log")
+	}
+	id, err := strconv.ParseUint(idStr, 10, 64)
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid id"})
+		return
+	}
+	path := filepath.Join(fs.dataDir, fmt.Sprintf("%d.events.log", id))
+	info, err := os.Stat(path)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "cart not found"})
+			return
+		}
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+		return
+	}
+	lines, err := readRawLogLines(path)
+	if err != nil {
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{
+		"id":     id,
+		"rawLog": lines,
+		"meta": map[string]any{
+			"size":     info.Size(),
+			"modified": info.ModTime(),
+			"path":     path,
+		},
+	})
+}