From 423560bdaddf5932372429f40888410a68fb7ec2 Mon Sep 17 00:00:00 2001
From: luowei <glpat-EjySCyNjWiLqAED-YmwM>
Date: Tue, 24 Oct 2023 22:32:40 +0800
Subject: [PATCH] mermaid front-end rendering initialization exception handling
 logic optimization

---
 web/app/components/app/chat/mermaid/index.tsx | 27 ++++++++++++++-----
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/web/app/components/app/chat/mermaid/index.tsx b/web/app/components/app/chat/mermaid/index.tsx
index af0b68e6580319..52c0a2020974ff 100644
--- a/web/app/components/app/chat/mermaid/index.tsx
+++ b/web/app/components/app/chat/mermaid/index.tsx
@@ -32,6 +32,14 @@ const Flowchart = React.forwardRef((props: {
   const chartId = useRef(`flowchart_${CryptoJS.MD5(props.PrimitiveCode).toString()}`)
   const [isRender, setIsRender] = useState(true)
 
+  const clearFlowchartCache = () => {
+    for (let i = localStorage.length - 1; i >= 0; --i) {
+      const key = localStorage.key(i)
+      if (key && key.startsWith('flowchart_'))
+        localStorage.removeItem(key)
+    }
+  }
+
   const renderFlowchart = async (PrimitiveCode: string) => {
     try {
       const cachedSvg: any = localStorage.getItem(chartId.current)
@@ -44,15 +52,15 @@ const Flowchart = React.forwardRef((props: {
         const svgGraph = await mermaidAPI.render(chartId.current, PrimitiveCode)
         // eslint-disable-next-line @typescript-eslint/no-use-before-define
         const base64Svg: any = await svgToBase64(svgGraph.svg)
-        localStorage.setItem(chartId.current, base64Svg)
         setSvgCode(base64Svg)
+        if (chartId.current && base64Svg)
+          localStorage.setItem(chartId.current, base64Svg)
       }
     }
     catch (error) {
-      localStorage.clear()
-      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
-      // @ts-expect-error
-      console.error(error.toString())
+      clearFlowchartCache()
+      // eslint-disable-next-line @typescript-eslint/no-use-before-define
+      handleReRender()
     }
   }
 
@@ -70,7 +78,9 @@ const Flowchart = React.forwardRef((props: {
   const handleReRender = () => {
     setIsRender(false)
     setSvgCode(null)
-    localStorage.removeItem(chartId.current)
+    if (chartId.current)
+      localStorage.removeItem(chartId.current)
+
     setTimeout(() => {
       setIsRender(true)
       renderFlowchart(props.PrimitiveCode)
@@ -90,7 +100,10 @@ const Flowchart = React.forwardRef((props: {
     // @ts-expect-error
     <div ref={ref}>
       {
-        isRender && <div id={chartId.current} className="mermaid" style={style}>{svgCode && (<img src={svgCode} style={{ width: '100%', height: 'auto' }} alt="Mermaid chart" />)}</div>
+        isRender
+          && <div id={chartId.current} className="mermaid" style={style}>
+            {svgCode && <img src={svgCode} style={{ width: '100%', height: 'auto' }} alt="Mermaid chart" />}
+          </div>
       }
       <button onClick={handleReRender}>{t('appApi.merMaind.rerender')}</button>
     </div>