Error improvements

src/npm-fastui-bootstrap/src/index.tsx

@@ -137,5 +137,11 @@ export const classNameGenerator: ClassNameGenerator = ({
       }
     case 'Code':
       return 'rounded'
+    case 'Error':
+      if (props.statusCode === 502) {
+        return 'm-3 text-muted'
+      } else {
+        return 'alert alert-danger m-3'
+      }
   }
 }

src/npm-fastui-prebuilt/src/main.scss

@@ -3,7 +3,9 @@ $link-color: #0d6efd; // bootstrap primary
 
 @import 'bootstrap/scss/bootstrap';
 
-html, body, #root {
+html,
+body,
+#root {
   height: 100%;
 }
 
@@ -33,7 +35,12 @@ body {
   backdrop-filter: blur(8px);
 }
 
-h1, h2, h3, h4, h5, h6 {
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
   scroll-margin-top: 60px;
 }
 

src/npm-fastui-prebuilt/vite.config.ts

@@ -1,14 +1,25 @@
 import path from 'path'
 
 import react from '@vitejs/plugin-react-swc'
-import { defineConfig } from 'vite'
+import { defineConfig, HttpProxy } from 'vite'
 
 export default () => {
   const serverConfig = {
     host: true,
     port: 3000,
     proxy: {
-      '/api': 'http://localhost:8000',
+      '/api': {
+        target: 'http://localhost:8000',
+        configure: (proxy: HttpProxy.Server) => {
+          proxy.on('error', (err, _, res) => {
+            const { code } = err as any
+            if (code === 'ECONNREFUSED') {
+              res.writeHead(502, { 'content-type': 'text/plain' })
+              res.end('vite-proxy: Proxy connection refused')
+            }
+          })
+        },
+      },
     },
   }
 

src/npm-fastui/src/components/Custom.tsx

@@ -1,14 +1,13 @@
-import { FC, useContext } from 'react'
+import { FC } from 'react'
 
 import type { Custom } from '../models'
 
-import { ErrorContext } from '../hooks/error'
+import { DisplayError } from '../hooks/error'
 
 import { JsonComp } from './Json'
 
 export const CustomComp: FC<Custom> = (props) => {
   const { data, subType, library } = props
-  const { DisplayError } = useContext(ErrorContext)
 
   const description = [`The custom component "${subType}"`]
   if (library) {

src/npm-fastui/src/components/error.tsx

@@ -0,0 +1,24 @@
+import { FC } from 'react'
+
+import type { Error } from '../models'
+
+import { useClassName } from '../hooks/className'
+
+export const ErrorComp: FC<Error> = (props) => {
+  const { title, description, statusCode, children } = props
+  return (
+    <>
+      <div className={useClassName(props)} role="alert">
+        {statusCode === 502 ? (
+          <>Backend server down.</>
+        ) : (
+          <>
+            <h4>{title}</h4>
+            {description}
+          </>
+        )}
+      </div>
+      {children}
+    </>
+  )
+}

src/npm-fastui/src/components/index.tsx

@@ -1,8 +1,8 @@
-import { useContext, FC } from 'react'
+import { FC } from 'react'
 
 import type { FastProps, Display, Text, ServerLoad, PageTitle, FireEvent } from '../models'
 
-import { ErrorContext } from '../hooks/error'
+import { DisplayError } from '../hooks/error'
 import { useCustomRender } from '../hooks/config'
 import { unreachable } from '../tools'
 
@@ -37,6 +37,7 @@ import { ImageComp } from './image'
 import { IframeComp } from './Iframe'
 import { VideoComp } from './video'
 import { FireEventComp } from './FireEvent'
+import { ErrorComp } from './error'
 import { CustomComp } from './Custom'
 
 // TODO some better way to export components
@@ -70,6 +71,7 @@ export {
   IframeComp,
   VideoComp,
   FireEventComp,
+  ErrorComp,
   CustomComp,
   LinkRender,
 }
@@ -85,8 +87,6 @@ export const AnyCompList: FC<{ propsList: FastProps[] }> = ({ propsList }) => (
 )
 
 export const AnyComp: FC<FastProps> = (props) => {
-  const { DisplayError } = useContext(ErrorContext)
-
   const CustomRenderComp = useCustomRender(props)
   if (CustomRenderComp) {
     return <CustomRenderComp />
@@ -155,6 +155,8 @@ export const AnyComp: FC<FastProps> = (props) => {
         return <VideoComp {...props} />
       case 'FireEvent':
         return <FireEventComp {...props} />
+      case 'Error':
+        return <ErrorComp {...props} />
       case 'Custom':
         return <CustomComp {...props} />
       default:

src/npm-fastui/src/hooks/error.tsx

@@ -1,40 +1,49 @@
 import { createContext, FC, ReactNode, useCallback, useContext, useState } from 'react'
 
+import type { Error as ErrorProps } from '../models'
+
+import { ErrorComp } from '../components'
+
+import { useCustomRender } from './config'
+
 interface ErrorDetails {
   title: string
   description: string
+  statusCode?: number
 }
 
 interface ErrorDisplayProps extends ErrorDetails {
   children?: ReactNode
 }
 
-export type ErrorDisplayType = FC<ErrorDisplayProps>
-
 interface ErrorContextType {
   error: ErrorDetails | null
   setError: (error: ErrorDetails | null) => void
-  DisplayError: ErrorDisplayType
 }
 
-const DefaultErrorDisplay: ErrorDisplayType = ({ title, description, children }) => (
-  <>
-    <div className="alert alert-danger m-3" role="alert">
-      <h4>{title}</h4>
-      {description}
-    </div>
-    {children}
-  </>
-)
+export const DisplayError: FC<ErrorDisplayProps> = ({ title, description, statusCode, children }) => {
+  const props: ErrorProps = {
+    title,
+    description,
+    statusCode,
+    children,
+    type: 'Error',
+  }
+  const CustomRenderComp = useCustomRender(props)
+  if (CustomRenderComp) {
+    return <CustomRenderComp />
+  } else {
+    return <ErrorComp {...props} />
+  }
+}
 
 export const ErrorContext = createContext<ErrorContextType>({
   error: null,
   setError: () => null,
-  DisplayError: DefaultErrorDisplay,
 })
 
 const MaybeError: FC<{ children: ReactNode }> = ({ children }) => {
-  const { error, DisplayError } = useContext(ErrorContext)
+  const { error } = useContext(ErrorContext)
   if (error) {
     return <DisplayError {...error}>{children}</DisplayError>
   } else {
@@ -43,11 +52,10 @@ const MaybeError: FC<{ children: ReactNode }> = ({ children }) => {
 }
 
 interface Props {
-  DisplayError?: ErrorDisplayType
   children: ReactNode
 }
 
-export const ErrorContextProvider: FC<Props> = ({ DisplayError, children }) => {
+export const ErrorContextProvider: FC<Props> = ({ children }) => {
   const [error, setErrorState] = useState<ErrorDetails | null>(null)
 
   const setError = useCallback(
@@ -59,10 +67,9 @@ export const ErrorContextProvider: FC<Props> = ({ DisplayError, children }) => {
     },
     [setErrorState],
   )
-  const contextValue: ErrorContextType = { error, setError, DisplayError: DisplayError ?? DefaultErrorDisplay }
 
   return (
-    <ErrorContext.Provider value={contextValue}>
+    <ErrorContext.Provider value={{ error, setError }}>
       <MaybeError>{children}</MaybeError>
     </ErrorContext.Provider>
   )

src/npm-fastui/src/index.tsx

@@ -1,6 +1,5 @@
 import { FC, ReactNode } from 'react'
 
-import type { ErrorDisplayType } from './hooks/error'
 import type { FastProps } from './models'
 
 import { LocationProvider } from './hooks/locationContext'
@@ -26,25 +25,24 @@ export interface FastUIProps {
   Spinner?: FC
   NotFound?: FC<{ url: string }>
   Transition?: FC<{ children: ReactNode; transitioning: boolean }>
-  DisplayError?: ErrorDisplayType
   classNameGenerator?: ClassNameGenerator
   customRender?: CustomRender
   // defaults to `process.env.NODE_ENV === 'development'
   devMode?: boolean
 }
 
 export function FastUI(props: FastUIProps) {
-  const { classNameGenerator, DisplayError, devMode, ...rest } = props
+  const { classNameGenerator, devMode, ...rest } = props
   return (
-    <ErrorContextProvider DisplayError={DisplayError}>
-      <LocationProvider>
-        <ClassNameContext.Provider value={classNameGenerator ?? null}>
+    <ClassNameContext.Provider value={classNameGenerator ?? null}>
+      <ErrorContextProvider>
+        <LocationProvider>
           <ConfigContext.Provider value={rest}>
             <DevReload enabled={devMode} />
             <FastUIController />
           </ConfigContext.Provider>
-        </ClassNameContext.Provider>
-      </LocationProvider>
-    </ErrorContextProvider>
+        </LocationProvider>
+      </ErrorContextProvider>
+    </ClassNameContext.Provider>
   )
 }

src/npm-fastui/src/models.d.ts

@@ -25,6 +25,7 @@ export type FastProps =
   | Iframe
   | Video
   | FireEvent
+  | Error
   | Custom
   | Table
   | Pagination
@@ -242,6 +243,14 @@ export interface FireEvent {
   message?: string
   type: 'FireEvent'
 }
+export interface Error {
+  title: string
+  description: string
+  statusCode?: number
+  className?: ClassName
+  type: 'Error'
+  children?: ReactNode
+}
 export interface Custom {
   data: JsonData
   subType: string

src/npm-fastui/src/tools.ts

@@ -12,7 +12,12 @@ export function useRequest(): (args: RequestArgs) => Promise<[number, any]> {
       try {
         return await request(args)
       } catch (e) {
-        setError({ title: 'Request Error', description: (e as any)?.message })
+        const title = 'Request Error'
+        if (e instanceof RequestError) {
+          setError({ title, description: e.message, statusCode: e.status })
+        } else {
+          setError({ title, description: (e as any)?.message })
+        }
         throw e
       }
     },

src/python-fastui/fastui/components/__init__.py

@@ -47,6 +47,7 @@
     'Image',
     'Iframe',
     'FireEvent',
+    'Error',
     'Custom',
     'Table',
     'Pagination',
@@ -271,6 +272,23 @@ class FireEvent(_p.BaseModel, extra='forbid'):
     type: _t.Literal['FireEvent'] = 'FireEvent'
 
 
+class Error(_p.BaseModel, extra='forbid'):
+    title: str
+    description: str
+    status_code: _t.Union[int, None] = _p.Field(None, serialization_alias='statusCode')
+    class_name: _class_name.ClassNameField = None
+    type: _t.Literal['Error'] = 'Error'
+
+    @classmethod
+    def __get_pydantic_json_schema__(
+        cls, core_schema: _core_schema.CoreSchema, handler: _p.GetJsonSchemaHandler
+    ) -> _t.Any:
+        # add `children` to the schema so it can be used in the client
+        json_schema = handler(core_schema)
+        json_schema['properties']['children'] = {'tsType': 'ReactNode'}
+        return json_schema
+
+
 class Custom(_p.BaseModel, extra='forbid'):
     data: _types.JsonData
     sub_type: str = _p.Field(serialization_alias='subType')
@@ -301,6 +319,7 @@ class Custom(_p.BaseModel, extra='forbid'):
         Iframe,
         Video,
         FireEvent,
+        Error,
         Custom,
         Table,
         Pagination,