477 lines
11 KiB
Go
477 lines
11 KiB
Go
package webui
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import (
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"embed"
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"encoding/json"
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"fmt"
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"io/fs"
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"maps"
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"net/http"
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"sort"
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"strconv"
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"strings"
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"code.tczkiot.com/wlw/srdb"
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)
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//go:embed static
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var staticFS embed.FS
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// WebUI Web 界面处理器 v2 (Preact)
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type WebUI struct {
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db *srdb.Database
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handler http.Handler
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}
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// NewWebUI 创建 WebUI v2 实例
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func NewWebUI(db *srdb.Database) *WebUI {
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ui := &WebUI{db: db}
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ui.handler = ui.setupHandler()
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return ui
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}
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// setupHandler 设置 HTTP Handler
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func (ui *WebUI) setupHandler() http.Handler {
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mux := http.NewServeMux()
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// API endpoints - 纯 JSON API（与 v1 共享）
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mux.HandleFunc("/api/tables", ui.handleListTables)
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mux.HandleFunc("/api/tables/", ui.handleTableAPI)
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// 静态文件服务
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staticFiles, _ := fs.Sub(staticFS, "static")
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mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticFiles))))
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// 首页
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mux.HandleFunc("/", ui.handleIndex)
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return mux
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}
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// Handler 返回 HTTP Handler
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func (ui *WebUI) Handler() http.Handler {
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return ui.handler
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}
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// ServeHTTP 实现 http.Handler 接口
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func (ui *WebUI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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ui.handler.ServeHTTP(w, r)
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}
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// handleListTables 处理获取表列表请求
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func (ui *WebUI) handleListTables(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodGet {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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type FieldInfo struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Indexed bool `json:"indexed"`
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Comment string `json:"comment"`
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}
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type TableListItem struct {
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Name string `json:"name"`
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RowCount int64 `json:"row_count,omitempty"`
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CreatedAt int64 `json:"created_at"`
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Fields []FieldInfo `json:"fields"`
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}
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allTables := ui.db.GetAllTablesInfo()
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tables := make([]TableListItem, 0, len(allTables))
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for name, table := range allTables {
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schema := table.GetSchema()
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fields := make([]FieldInfo, 0, len(schema.Fields))
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for _, field := range schema.Fields {
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fields = append(fields, FieldInfo{
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Name: field.Name,
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Type: field.Type.String(),
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Indexed: field.Indexed,
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Comment: field.Comment,
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})
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}
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// 尝试获取行数（通过快速查询）
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rowCount := int64(0)
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if rows, err := table.Query().Rows(); err == nil {
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for rows.Next() {
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rowCount++
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}
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rows.Close()
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}
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tables = append(tables, TableListItem{
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Name: name,
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RowCount: rowCount,
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CreatedAt: 0, // TODO: Table 不再有 createdAt 字段
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Fields: fields,
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})
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}
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// 按表名排序
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sort.Slice(tables, func(i, j int) bool {
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return tables[i].Name < tables[j].Name
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})
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(map[string]any{
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"tables": tables,
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})
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}
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// handleTableAPI 处理表相关的 API 请求
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func (ui *WebUI) handleTableAPI(w http.ResponseWriter, r *http.Request) {
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// 解析路径: /api/tables/{name}/schema 或 /api/tables/{name}/data
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path := strings.TrimPrefix(r.URL.Path, "/api/tables/")
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parts := strings.Split(path, "/")
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if len(parts) < 2 {
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http.Error(w, "Invalid path", http.StatusBadRequest)
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return
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}
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tableName := parts[0]
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action := parts[1]
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switch action {
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case "schema":
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ui.handleTableSchema(w, r, tableName)
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case "data":
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// 检查是否是单条数据查询: /api/tables/{name}/data/{seq}
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if len(parts) >= 3 {
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ui.handleTableDataBySeq(w, r, tableName, parts[2])
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} else {
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ui.handleTableData(w, r, tableName)
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}
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case "manifest":
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ui.handleTableManifest(w, r, tableName)
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default:
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http.Error(w, "Unknown action", http.StatusBadRequest)
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}
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}
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// handleTableSchema 处理获取表 schema 请求
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func (ui *WebUI) handleTableSchema(w http.ResponseWriter, r *http.Request, tableName string) {
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if r.Method != http.MethodGet {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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table, err := ui.db.GetTable(tableName)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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schema := table.GetSchema()
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type FieldInfo struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Indexed bool `json:"indexed"`
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Comment string `json:"comment"`
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}
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fields := make([]FieldInfo, 0, len(schema.Fields))
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for _, field := range schema.Fields {
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fields = append(fields, FieldInfo{
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Name: field.Name,
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Type: field.Type.String(),
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Indexed: field.Indexed,
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Comment: field.Comment,
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})
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}
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response := map[string]any{
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"name": schema.Name,
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"fields": fields,
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(response)
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}
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// handleTableManifest 处理获取表 manifest 信息请求
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func (ui *WebUI) handleTableManifest(w http.ResponseWriter, r *http.Request, tableName string) {
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if r.Method != http.MethodGet {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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table, err := ui.db.GetTable(tableName)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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versionSet := table.GetVersionSet()
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version := versionSet.GetCurrent()
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// 构建每层的信息
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type FileInfo struct {
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FileNumber int64 `json:"file_number"`
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Level int `json:"level"`
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FileSize int64 `json:"file_size"`
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MinKey int64 `json:"min_key"`
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MaxKey int64 `json:"max_key"`
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RowCount int64 `json:"row_count"`
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}
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type LevelInfo struct {
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Level int `json:"level"`
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FileCount int `json:"file_count"`
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TotalSize int64 `json:"total_size"`
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Score float64 `json:"score"`
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Files []FileInfo `json:"files"`
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}
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// 获取 Compaction Manager
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compactionMgr := table.GetCompactionManager()
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// 只显示 L0-L3 层
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levels := make([]LevelInfo, 0, 4)
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for level := range 4 {
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files := version.GetLevel(level)
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totalSize := int64(0)
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fileInfos := make([]FileInfo, 0, len(files))
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for _, f := range files {
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totalSize += f.FileSize
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fileInfos = append(fileInfos, FileInfo{
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FileNumber: f.FileNumber,
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Level: f.Level,
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FileSize: f.FileSize,
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MinKey: f.MinKey,
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MaxKey: f.MaxKey,
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RowCount: f.RowCount,
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})
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}
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score := 0.0
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if len(files) > 0 && level < 3 {
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nextLevelLimit := compactionMgr.GetLevelSizeLimit(level + 1)
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if nextLevelLimit > 0 {
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score = float64(totalSize) / float64(nextLevelLimit)
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}
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}
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levels = append(levels, LevelInfo{
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Level: level,
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FileCount: len(files),
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TotalSize: totalSize,
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Score: score,
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Files: fileInfos,
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})
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}
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// 获取 Compaction 统计
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stats := compactionMgr.GetStats()
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response := map[string]any{
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"levels": levels,
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"next_file_number": versionSet.GetNextFileNumber(),
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"last_sequence": versionSet.GetLastSequence(),
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"compaction_stats": stats,
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(response)
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}
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// handleTableDataBySeq 处理获取单条数据请求
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func (ui *WebUI) handleTableDataBySeq(w http.ResponseWriter, r *http.Request, tableName string, seqStr string) {
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if r.Method != http.MethodGet {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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table, err := ui.db.GetTable(tableName)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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// 解析 seq
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seq, err := strconv.ParseInt(seqStr, 10, 64)
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if err != nil {
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http.Error(w, "Invalid seq parameter", http.StatusBadRequest)
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return
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}
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// 获取数据
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row, err := table.Get(seq)
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if err != nil {
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http.Error(w, fmt.Sprintf("Row not found: %v", err), http.StatusNotFound)
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return
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}
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// 构造响应（不进行剪裁，返回完整数据）
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rowData := make(map[string]any)
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rowData["_seq"] = row.Seq
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rowData["_time"] = row.Time
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maps.Copy(rowData, row.Data)
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(rowData)
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}
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// handleTableData 处理获取表数据请求（分页）
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func (ui *WebUI) handleTableData(w http.ResponseWriter, r *http.Request, tableName string) {
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if r.Method != http.MethodGet {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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table, err := ui.db.GetTable(tableName)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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// 解析查询参数
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limitStr := r.URL.Query().Get("limit")
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offsetStr := r.URL.Query().Get("offset")
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selectParam := r.URL.Query().Get("select") // 要选择的字段，逗号分隔
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limit := 100
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offset := 0
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if limitStr != "" {
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if l, err := strconv.Atoi(limitStr); err == nil && l > 0 && l <= 1000 {
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limit = l
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}
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}
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if offsetStr != "" {
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if o, err := strconv.Atoi(offsetStr); err == nil && o >= 0 {
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offset = o
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}
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}
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// 解析要选择的字段
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var selectedFields []string
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if selectParam != "" {
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selectedFields = strings.Split(selectParam, ",")
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for i := range selectedFields {
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selectedFields[i] = strings.TrimSpace(selectedFields[i])
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}
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}
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// 获取 schema
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tableSchema := table.GetSchema()
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// 使用 Query API 获取数据
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queryBuilder := table.Query()
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if len(selectedFields) > 0 {
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fieldsWithMeta := make([]string, 0, len(selectedFields)+2)
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hasSeq := false
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hasTime := false
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for _, field := range selectedFields {
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switch field {
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case "_seq":
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hasSeq = true
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case "_time":
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hasTime = true
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}
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}
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if !hasSeq {
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fieldsWithMeta = append(fieldsWithMeta, "_seq")
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}
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if !hasTime {
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fieldsWithMeta = append(fieldsWithMeta, "_time")
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}
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fieldsWithMeta = append(fieldsWithMeta, selectedFields...)
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queryBuilder = queryBuilder.Select(fieldsWithMeta...)
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}
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queryRows, err := queryBuilder.Rows()
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if err != nil {
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http.Error(w, fmt.Sprintf("Failed to query table: %v", err), http.StatusInternalServerError)
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return
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}
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defer queryRows.Close()
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// 收集数据
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const maxStringLength = 100
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data := make([]map[string]any, 0, limit)
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currentIndex := 0
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totalRows := int64(0)
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for queryRows.Next() {
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totalRows++
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// 跳过 offset 之前的数据
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if currentIndex < offset {
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currentIndex++
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continue
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}
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// 已经收集够数据
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if len(data) >= limit {
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continue
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}
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row := queryRows.Row()
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rowData := make(map[string]any)
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rowData["_seq"] = row.Data()["_seq"]
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rowData["_time"] = row.Data()["_time"]
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// 遍历所有字段并进行字符串截断
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for k, v := range row.Data() {
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if k == "_seq" || k == "_time" {
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continue
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}
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// 检查字段类型
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field, err := tableSchema.GetField(k)
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if err == nil && field.Type == srdb.String {
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// 对字符串字段进行剪裁
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if str, ok := v.(string); ok {
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runes := []rune(str)
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if len(runes) > maxStringLength {
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rowData[k] = string(runes[:maxStringLength]) + "..."
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rowData[k+"_truncated"] = true
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continue
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}
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}
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}
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rowData[k] = v
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}
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data = append(data, rowData)
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currentIndex++
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}
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response := map[string]any{
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"data": data,
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"limit": limit,
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"offset": offset,
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"totalRows": totalRows,
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(response)
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}
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// handleIndex 处理首页请求
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func (ui *WebUI) handleIndex(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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}
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// 读取 index.html
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content, err := staticFS.ReadFile("static/index.html")
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if err != nil {
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http.Error(w, "Failed to load page", http.StatusInternalServerError)
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fmt.Fprintf(w, "Error: %v", err)
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return
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.Write(content)
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}
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