Add serialization API to StaticNetFilteringEngine (#3806)

platform/nodejs/index.js

@@ -182,6 +182,25 @@ async function useLists(lists, options = {}) {
 
 /******************************************************************************/
 
+class MockStorage {
+    constructor(serialized) {
+        this.map = new Map(serialized);
+    }
+
+    async put(assetKey, content) {
+        this.map.set(assetKey, content);
+        return ({ assetKey, content });
+    }
+
+    async get(assetKey) {
+        return ({ assetKey, content: this.map.get(assetKey) });
+    }
+
+    *[Symbol.iterator]() {
+        yield* this.map;
+    }
+}
+
 const fctx = new FilteringContext();
 let snfeInstance = null;
 
@@ -194,7 +213,7 @@ class StaticNetFilteringEngine {
     }
 
     async useLists(lists) {
-        return useLists(lists);
+        await useLists(lists);
     }
 
     matchRequest(details) {
@@ -213,7 +232,18 @@ class StaticNetFilteringEngine {
         return compileList(...args);
     }
 
-    static async create({ noPSL } = {}) {
+    async serialize() {
+        const storage = new MockStorage();
+        await snfe.toSelfie(storage, 'path');
+        return JSON.stringify([...storage]);
+    }
+
+    async deserialize(serialized) {
+        const storage = new MockStorage(JSON.parse(serialized));
+        await snfe.fromSelfie(storage, 'path');
+    }
+
+    static async create({ noPSL = false } = {}) {
         const instance = new StaticNetFilteringEngine();
 
         if ( noPSL !== true && !pslInit() ) {

platform/nodejs/test.js

@@ -42,23 +42,7 @@ function fetch(listName) {
     });
 }
 
-async function main() {
-    try {
-        const result = await enableWASM();
-        if ( result !== true ) {
-            console.log('Failed to enable all WASM code paths');
-        }
-    } catch(ex) {
-        console.log(ex);
-    }
-
-    const engine = await StaticNetFilteringEngine.create();
-
-    await engine.useLists([
-        fetch('easylist').then(raw => ({ name: 'easylist', raw })),
-        fetch('easyprivacy').then(raw => ({ name: 'easyprivacy', raw })),
-    ]);
-
+function runTests(engine) {
     let result = 0;
 
     // Tests
@@ -91,6 +75,35 @@ async function main() {
     if ( result !== 0 ) {
         console.log(engine.toLogData());
     }
+}
+
+async function main() {
+    try {
+        const result = await enableWASM();
+        if ( result !== true ) {
+            console.log('Failed to enable all WASM code paths');
+        }
+    } catch(ex) {
+        console.log(ex);
+    }
+
+    const engine = await StaticNetFilteringEngine.create();
+
+    await engine.useLists([
+        fetch('easylist').then(raw => ({ name: 'easylist', raw })),
+        fetch('easyprivacy').then(raw => ({ name: 'easyprivacy', raw })),
+    ]);
+
+    runTests(engine);
+
+    const serialized = await engine.serialize();
+    engine.useLists([]);
+
+    runTests(engine);
+
+    await engine.deserialize(serialized);
+
+    runTests(engine);
 
     process.exit();
 }