From 960cf3fe04508f88d385bd141087ddd3381f0d19 Mon Sep 17 00:00:00 2001
From: Daniel <845765@qq.com>
Date: Thu, 2 Nov 2023 16:05:35 +0800
Subject: [PATCH] :art: Identify the database view whether is a "mirror"
 https://github.com/siyuan-note/siyuan/issues/9578

---
 kernel/api/av.go |  2 ++
 kernel/av/av.go  | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/kernel/api/av.go b/kernel/api/av.go
index f945c9fe5..bd6d723db 100644
--- a/kernel/api/av.go
+++ b/kernel/api/av.go
@@ -21,6 +21,7 @@ import (
 
 	"github.com/88250/gulu"
 	"github.com/gin-gonic/gin"
+	"github.com/siyuan-note/siyuan/kernel/av"
 	"github.com/siyuan-note/siyuan/kernel/model"
 	"github.com/siyuan-note/siyuan/kernel/util"
 )
@@ -60,6 +61,7 @@ func renderAttributeView(c *gin.Context) {
 		"viewID":   view.GetID(),
 		"views":    views,
 		"view":     view,
+		"isMirror": av.IsMirror(attrView.ID),
 	}
 }
 
diff --git a/kernel/av/av.go b/kernel/av/av.go
index 2a6b38c0d..6385a4224 100644
--- a/kernel/av/av.go
+++ b/kernel/av/av.go
@@ -590,6 +590,31 @@ var (
 	attributeViewBlocksLock = sync.Mutex{}
 )
 
+func IsMirror(avID string) bool {
+	attributeViewBlocksLock.Lock()
+	defer attributeViewBlocksLock.Unlock()
+
+	blocks := filepath.Join(util.DataDir, "storage", "av", "blocks.msgpack")
+	if !gulu.File.IsExist(blocks) {
+		return false
+	}
+
+	data, err := filelock.ReadFile(blocks)
+	if nil != err {
+		logging.LogErrorf("read attribute view blocks failed: %s", err)
+		return false
+	}
+
+	avBlocks := map[string][]string{}
+	if err = msgpack.Unmarshal(data, &avBlocks); nil != err {
+		logging.LogErrorf("unmarshal attribute view blocks failed: %s", err)
+		return false
+	}
+
+	blockIDs := avBlocks[avID]
+	return nil != blockIDs && 1 < len(blockIDs)
+}
+
 func RemoveBlockRel(avID, blockID string) {
 	attributeViewBlocksLock.Lock()
 	defer attributeViewBlocksLock.Unlock()