Fix truncation issues in piplan, SQLite storage, and history compression; add PIPlanMaxChars configuration

internal/transport/webui/bot.go

@@ -15,6 +15,8 @@ import (
 	"laodingbot/internal/config"
 	"laodingbot/internal/llm"
 	"laodingbot/internal/logger"
+	"laodingbot/internal/memory"
+	"strconv"
 )
 
 type IncomingMessage struct {
@@ -32,20 +34,26 @@ const (
 	StreamEventTypeToolResult StreamEventType = "tool_result" // 工具执行结果
 	StreamEventTypeFinal      StreamEventType = "final"       // 最终答案
 	StreamEventTypeError      StreamEventType = "error"       // 错误信息
+
+	StreamEventTypeWorkspaceStart StreamEventType = "workspace_start" // 工具渲染开始
+	StreamEventTypeWorkspaceDelta StreamEventType = "workspace_delta" // 工具渲染增量内容
+	StreamEventTypeWorkspaceEnd   StreamEventType = "workspace_end"   // 工具渲染结束
 )
 
 // StreamEvent 代表流式输出中的一个事件
 type StreamEvent struct {
-	Type     StreamEventType `json:"type"`
-	Content  string          `json:"content"`
-	Step     int             `json:"step,omitempty"`
-	ToolName string          `json:"tool_name,omitempty"`
+	Type           StreamEventType `json:"type"`
+	Content        string          `json:"content"`
+	Step           int             `json:"step,omitempty"`
+	ToolName       string          `json:"tool_name,omitempty"`
+	WorkspaceTitle string          `json:"workspace_title,omitempty"` // 仅用于 workspace_start 类型
 }
 
 type ChatHandler func(context.Context, IncomingMessage) (string, error)
 type StreamChatHandler func(context.Context, IncomingMessage, StreamEventCallback) (string, error)
 type StreamEventCallback func(event StreamEvent) error
 type UploadHandler func(context.Context, string, string, []llm.InputFile) ([]string, error)
+type HistoryHandler func(context.Context, string, int) ([]memory.Message, error)
 
 type Bot struct {
 	listenAddr     string
@@ -55,6 +63,7 @@ type Bot struct {
 	chatHandler       ChatHandler
 	streamChatHandler StreamChatHandler
 	uploadHandler     UploadHandler
+	historyHandler    HistoryHandler
 	counter           uint64
 }
 
@@ -118,7 +127,7 @@ func NewBot(cfg config.WebUIConfig, log *logger.Logger) (*Bot, error) {
 	}, nil
 }
 
-func (b *Bot) Run(ctx context.Context, chatHandler ChatHandler, streamChatHandler StreamChatHandler, uploadHandler UploadHandler) error {
+func (b *Bot) Run(ctx context.Context, chatHandler ChatHandler, streamChatHandler StreamChatHandler, uploadHandler UploadHandler, historyHandler HistoryHandler) error {
 	if chatHandler == nil {
 		return fmt.Errorf("nil webui chat handler")
 	}
@@ -128,11 +137,13 @@ func (b *Bot) Run(ctx context.Context, chatHandler ChatHandler, streamChatHandle
 	b.chatHandler = chatHandler
 	b.streamChatHandler = streamChatHandler
 	b.uploadHandler = uploadHandler
+	b.historyHandler = historyHandler
 
 	mux := http.NewServeMux()
 	mux.HandleFunc("/api/chat", b.handleChat)
 	mux.HandleFunc("/api/chat/stream", b.handleChatStream)
 	mux.HandleFunc("/api/upload", b.handleUpload)
+	mux.HandleFunc("/api/history", b.handleHistory)
 
 	srv := &http.Server{
 		Addr:    b.listenAddr,
@@ -220,6 +231,42 @@ func (b *Bot) handleChat(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+func (b *Bot) handleHistory(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		writeJSON(w, http.StatusMethodNotAllowed, errorResponse{Error: "method not allowed"})
+		return
+	}
+	if b.historyHandler == nil {
+		writeJSON(w, http.StatusInternalServerError, errorResponse{Error: "history handler not ready"})
+		return
+	}
+
+	sessionID := strings.TrimSpace(r.URL.Query().Get("session_id"))
+	if sessionID == "" {
+		writeJSON(w, http.StatusBadRequest, errorResponse{Error: "session_id is required"})
+		return
+	}
+
+	limitStr := strings.TrimSpace(r.URL.Query().Get("limit"))
+	limit := 20
+	if limitStr != "" {
+		if l, err := strconv.Atoi(limitStr); err == nil && l > 0 {
+			limit = l
+		}
+	}
+
+	history, err := b.historyHandler(r.Context(), sessionID, limit)
+	if err != nil {
+		if b.log != nil {
+			b.log.Errorf("webui history handler failed session_id=%s err=%v", sessionID, err)
+		}
+		writeJSON(w, http.StatusInternalServerError, errorResponse{Error: "load history failed"})
+		return
+	}
+
+	writeJSON(w, http.StatusOK, history)
+}
+
 func firstNonEmpty(vals ...string) string {
 
 	for _, v := range vals {