chore: clean up code and add ttl based component caching

example/package.json

@@ -15,7 +15,8 @@
     "react": "18.2.0",
     "react-native": "0.73.6",
     "react-native-safe-area-context": "^4.9.0",
-    "react-native-screens": "^3.29.0"
+    "react-native-screens": "^3.29.0",
+    "react-native-server-component": "link:../src"
   },
   "devDependencies": {
     "@babel/core": "^7.20.0",

example/src/screens/HomeScreen.tsx

@@ -1,5 +1,5 @@
 import React, { useCallback } from 'react';
-import { View, StyleSheet, Text, Pressable } from 'react-native';
+import { View, StyleSheet, Text } from 'react-native';
 import { ServerComponent } from 'react-native-server-component';
 
 export default function HomeScreen({ navigation }) {
@@ -14,10 +14,18 @@ export default function HomeScreen({ navigation }) {
     [navigation]
   );
 
+  const FallbackComponent = () => {
+    return (
+      <View>
+        <Text> Fallback Component </Text>
+      </View>
+    );
+  };
   return (
     <View style={styles.container}>
       <ServerComponent
         source={{ uri: 'http://10.0.2.2:8080' }}
+        fallbackComponent={<FallbackComponent />}
         onAction={handleAction}
       />
       {/* <Pressable onPress={onPress}>

example/yarn.lock

@@ -5377,9 +5377,16 @@ __metadata:
     react-native: 0.73.6
     react-native-safe-area-context: ^4.9.0
     react-native-screens: ^3.29.0
+    react-native-server-component: "link:../src"
   languageName: unknown
   linkType: soft
 
+"react-native-server-component@link:../src::locator=react-native-server-component-example%40workspace%3A.":
+  version: 0.0.0-use.local
+  resolution: "react-native-server-component@link:../src::locator=react-native-server-component-example%40workspace%3A."
+  languageName: node
+  linkType: soft
+
 "react-native@npm:0.73.6":
   version: 0.73.6
   resolution: "react-native@npm:0.73.6"

server/Mocks/TranspiledExample.js

@@ -1 +1,154 @@
-"use strict";var _interopRequireDefault=require("@babel/runtime/helpers/interopRequireDefault");var _typeof=require("@babel/runtime/helpers/typeof");Object.defineProperty(exports,"__esModule",{value:true});exports["default"]=void 0;var _slicedToArray2=_interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));var _react=_interopRequireWildcard(require("react"));var _reactNative=require("react-native");var _this=void 0,_jsxFileName="/Users/kunal.chavhan/workplace/react-native-server-component/server/Mocks/ExampleServerComponent.tsx";function _getRequireWildcardCache(e){if("function"!=typeof WeakMap)return null;var r=new WeakMap(),t=new WeakMap();return(_getRequireWildcardCache=function _getRequireWildcardCache(e){return e?t:r;})(e);}function _interopRequireWildcard(e,r){if(!r&&e&&e.__esModule)return e;if(null===e||"object"!=_typeof(e)&&"function"!=typeof e)return{"default":e};var t=_getRequireWildcardCache(r);if(t&&t.has(e))return t.get(e);var n={__proto__:null},a=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var u in e)if("default"!==u&&{}.hasOwnProperty.call(e,u)){var i=a?Object.getOwnPropertyDescriptor(e,u):null;i&&(i.get||i.set)?Object.defineProperty(n,u,i):n[u]=e[u];}return n["default"]=e,t&&t.set(e,n),n;}var ExampleServerComponent=function ExampleServerComponent(_ref){var onAction=_ref.onAction;var _useState=(0,_react.useState)(''),_useState2=(0,_slicedToArray2["default"])(_useState,2),catFact=_useState2[0],setCatFact=_useState2[1];var onPress=(0,_react.useCallback)(function(){if(onAction){onAction('NAVIGATE',{route:'DetailsScreen'});}},[onAction]);(0,_react.useEffect)(function(){fetch('https://catfact.ninja/fact').then(function(resp){return resp.json();}).then(function(json){return json.fact;}).then(function(fact){return setCatFact(fact);});},[]);return _react["default"].createElement(_reactNative.View,{style:styles.container,__self:_this,__source:{fileName:_jsxFileName,lineNumber:24,columnNumber:5}},_react["default"].createElement(_reactNative.Text,{style:styles.hello,__self:_this,__source:{fileName:_jsxFileName,lineNumber:25,columnNumber:7}}," Hello Server Component"),_react["default"].createElement(_reactNative.Text,{style:styles.catFactsTitle,__self:_this,__source:{fileName:_jsxFileName,lineNumber:26,columnNumber:7}}," Cat Facts "),_react["default"].createElement(_reactNative.Text,{style:styles.facts,__self:_this,__source:{fileName:_jsxFileName,lineNumber:27,columnNumber:7}}," ",catFact," "),_react["default"].createElement(_reactNative.Pressable,{onPress:onPress,__self:_this,__source:{fileName:_jsxFileName,lineNumber:28,columnNumber:7}},_react["default"].createElement(_reactNative.View,{style:styles.button,__self:_this,__source:{fileName:_jsxFileName,lineNumber:29,columnNumber:9}},_react["default"].createElement(_reactNative.Text,{style:styles.text,__self:_this,__source:{fileName:_jsxFileName,lineNumber:30,columnNumber:11}}," ","Navigation"," "))));};var styles=_reactNative.StyleSheet.create({container:{flex:1,width:'100%',justifyContent:'center',padding:20},hello:{color:'red',fontWeight:'bold'},catFactsTitle:{marginTop:16,color:'blue',fontWeight:'bold'},facts:{marginTop:10,color:'black',fontWeight:'400'},text:{color:'black',fontWeight:'400',alignContent:'center',textAlign:'center'},button:{height:30,width:100,marginTop:20,borderRadius:3,backgroundColor:'#65A765',justifyContent:'center',alignContent:'center',alignSelf:'center'}});var _default=exports["default"]=ExampleServerComponent;
+'use strict';
+var _interopRequireDefault = require('@babel/runtime/helpers/interopRequireDefault');
+var _typeof = require('@babel/runtime/helpers/typeof');
+Object.defineProperty(exports, '__esModule', { value: true });
+exports['default'] = void 0;
+var _slicedToArray2 = _interopRequireDefault(
+  require('@babel/runtime/helpers/slicedToArray')
+);
+var _react = _interopRequireWildcard(require('react'));
+var _reactNative = require('react-native');
+var _this = void 0,
+  _jsxFileName =
+    '/Users/kunal.chavhan/workplace/react-native-server-component/server/Mocks/ExampleServerComponent.tsx';
+function _getRequireWildcardCache(e) {
+  if ('function' != typeof WeakMap) return null;
+  var r = new WeakMap(),
+    t = new WeakMap();
+  return (_getRequireWildcardCache = function _getRequireWildcardCache(e) {
+    return e ? t : r;
+  })(e);
+}
+function _interopRequireWildcard(e, r) {
+  if (!r && e && e.__esModule) return e;
+  if (null === e || ('object' != _typeof(e) && 'function' != typeof e))
+    return { default: e };
+  var t = _getRequireWildcardCache(r);
+  if (t && t.has(e)) return t.get(e);
+  var n = { __proto__: null },
+    a = Object.defineProperty && Object.getOwnPropertyDescriptor;
+  for (var u in e)
+    if ('default' !== u && {}.hasOwnProperty.call(e, u)) {
+      var i = a ? Object.getOwnPropertyDescriptor(e, u) : null;
+      i && (i.get || i.set) ? Object.defineProperty(n, u, i) : (n[u] = e[u]);
+    }
+  return (n['default'] = e), t && t.set(e, n), n;
+}
+var ExampleServerComponent = function ExampleServerComponent(_ref) {
+  var onAction = _ref.onAction;
+  var _useState = (0, _react.useState)(''),
+    _useState2 = (0, _slicedToArray2['default'])(_useState, 2),
+    catFact = _useState2[0],
+    setCatFact = _useState2[1];
+  var onPress = (0, _react.useCallback)(
+    function () {
+      if (onAction) {
+        onAction('NAVIGATE', { route: 'DetailsScreen' });
+      }
+    },
+    [onAction]
+  );
+  (0, _react.useEffect)(function () {
+    fetch('https://catfact.ninja/fact')
+      .then(function (resp) {
+        return resp.json();
+      })
+      .then(function (json) {
+        return json.fact;
+      })
+      .then(function (fact) {
+        return setCatFact(fact);
+      });
+  }, []);
+  return _react['default'].createElement(
+    _reactNative.View,
+    {
+      style: styles.container,
+      __self: _this,
+      __source: { fileName: _jsxFileName, lineNumber: 24, columnNumber: 5 },
+    },
+    _react['default'].createElement(
+      _reactNative.Text,
+      {
+        style: styles.hello,
+        __self: _this,
+        __source: { fileName: _jsxFileName, lineNumber: 25, columnNumber: 7 },
+      },
+      ' Hello Server Component'
+    ),
+    _react['default'].createElement(
+      _reactNative.Text,
+      {
+        style: styles.catFactsTitle,
+        __self: _this,
+        __source: { fileName: _jsxFileName, lineNumber: 26, columnNumber: 7 },
+      },
+      ' Cat Facts '
+    ),
+    _react['default'].createElement(
+      _reactNative.Text,
+      {
+        style: styles.facts,
+        __self: _this,
+        __source: { fileName: _jsxFileName, lineNumber: 27, columnNumber: 7 },
+      },
+      ' ',
+      catFact,
+      ' '
+    ),
+    _react['default'].createElement(
+      _reactNative.Pressable,
+      {
+        onPress: onPress,
+        __self: _this,
+        __source: { fileName: _jsxFileName, lineNumber: 28, columnNumber: 7 },
+      },
+      _react['default'].createElement(
+        _reactNative.View,
+        {
+          style: styles.button,
+          __self: _this,
+          __source: { fileName: _jsxFileName, lineNumber: 29, columnNumber: 9 },
+        },
+        _react['default'].createElement(
+          _reactNative.Text,
+          {
+            style: styles.text,
+            __self: _this,
+            __source: {
+              fileName: _jsxFileName,
+              lineNumber: 30,
+              columnNumber: 11,
+            },
+          },
+          ' ',
+          'Navigation',
+          ' '
+        )
+      )
+    )
+  );
+};
+var styles = _reactNative.StyleSheet.create({
+  container: { flex: 1, width: '100%', justifyContent: 'center', padding: 20 },
+  hello: { color: 'red', fontWeight: 'bold' },
+  catFactsTitle: { marginTop: 16, color: 'blue', fontWeight: 'bold' },
+  facts: { marginTop: 10, color: 'black', fontWeight: '400' },
+  text: {
+    color: 'black',
+    fontWeight: '400',
+    alignContent: 'center',
+    textAlign: 'center',
+  },
+  button: {
+    height: 30,
+    width: 100,
+    marginTop: 20,
+    borderRadius: 3,
+    backgroundColor: '#65A765',
+    justifyContent: 'center',
+    alignContent: 'center',
+    alignSelf: 'center',
+  },
+});
+var _default = (exports['default'] = ExampleServerComponent);

src/@types/index.ts

@@ -13,9 +13,9 @@ export type RSCActions = 'NAVIGATE' | 'IO' | 'STATE_CHANGE';
 export type RSCProps = {
   readonly global?: any;
   readonly source: RSCSource;
-  readonly fallbackComponent?: () => JSX.Element;
-  readonly loadingComponent?: () => JSX.Element;
-  readonly errorComponent?: () => JSX.Element;
+  readonly fallbackComponent?: JSX.Element;
+  readonly loadingComponent?: JSX.Element;
+  readonly errorComponent?: JSX.Element;
   readonly onError?: (error: Error) => void;
   readonly navigationRef?: React.Ref<any>;
   readonly onAction?: (

src/cache/componentCache.ts

@@ -1,10 +1,20 @@
+export interface CacheItem<T> {
+  // React component
+  value: T;
+  // TTL in milliseconds
+  // Default is -1, which means cache will persist in app session
+  // Cache will be purged for any new requests, based on ttl and timestamp values
+  ttl: number;
+  // Timestamp at which cache was created
+  timestamp: number;
+}
+
 class ComponentCache<T> {
-  // TODO implement TTL based cache bursting
   private static instance: ComponentCache<any>;
-  private cache: Map<string, T | null>;
+  private cache: Map<string, CacheItem<T> | null>;
 
   constructor() {
-    this.cache = new Map<string, T>();
+    this.cache = new Map<string, CacheItem<T>>();
   }
 
   public static getInstance<T>(): ComponentCache<T> {
@@ -14,18 +24,34 @@ class ComponentCache<T> {
     return ComponentCache.instance;
   }
 
-  set(key: string, value: T | null): void {
+  set(key: string, value: CacheItem<T> | null): void {
     this.cache.set(key, value);
   }
 
   get(key: string): T | null {
     const component = this.cache.get(key);
     if (component) {
-      return component;
+      return component.value;
     }
     return null;
   }
 
+  getTTL(key: string): number {
+    const value = this.cache.get(key);
+    if (value && value.ttl) {
+      return value.ttl;
+    }
+    return -1;
+  }
+
+  getTimeStamp(key: string): number {
+    const value = this.cache.get(key);
+    if (value && value.timestamp) {
+      return value.timestamp;
+    }
+    return -1;
+  }
+
   delete(key: string): void {
     this.cache.delete(key);
   }

src/component/ServerComponent.tsx

@@ -5,8 +5,8 @@ export default function RSC({
   source,
   openRSC,
   fallbackComponent,
-  loadingComponent = () => <React.Fragment />,
-  errorComponent = () => <React.Fragment />,
+  loadingComponent = <React.Fragment />,
+  errorComponent = <React.Fragment />,
   ...extras
 }: RSCProps): JSX.Element {
   const [ServerComponent, setServerComponent] =
@@ -31,11 +31,25 @@ export default function RSC({
 
   const FallbackComponent = React.useCallback((): JSX.Element => {
     if (fallbackComponent) {
-      return fallbackComponent();
+      return fallbackComponent;
     }
     return <></>;
   }, [fallbackComponent]);
 
+  const ErrorComponent = React.useCallback((): JSX.Element => {
+    if (errorComponent) {
+      return errorComponent;
+    }
+    return <></>;
+  }, [errorComponent]);
+
+  const LoadingComponent = React.useCallback((): JSX.Element => {
+    if (loadingComponent) {
+      return loadingComponent;
+    }
+    return <></>;
+  }, [loadingComponent]);
+
   if (typeof ServerComponent === 'function') {
     return (
       <React.Fragment>
@@ -45,7 +59,7 @@ export default function RSC({
       </React.Fragment>
     );
   } else if (error) {
-    return errorComponent();
+    return <ErrorComponent />;
   }
-  return loadingComponent();
+  return <LoadingComponent />;
 }