*Abort if module is already registered

src/resolverRegistry.ts

@@ -8,17 +8,18 @@ import type { RpcNetwork } from "@lumeweb/kernel-rpc-client";
 import { callModule } from "libkmodule/dist";
 
 export class ResolverRegistry {
-  private _resolvers: Set<ResolverModule> = new Set();
-  private _rpcNetwork: RpcNetwork;
-
   constructor(network: RpcNetwork) {
     this._rpcNetwork = network;
   }
 
+  private _resolvers: Set<ResolverModule> = new Set<ResolverModule>();
+
   get resolvers(): Set<ResolverModule> {
     return this._resolvers;
   }
 
+  private _rpcNetwork: RpcNetwork;
+
   get rpcNetwork(): RpcNetwork {
     return this._rpcNetwork;
   }
@@ -28,7 +29,7 @@ export class ResolverRegistry {
     options: ResolverOptions = { type: DNS_RECORD_TYPE.DEFAULT },
     bypassCache: boolean = false
   ): Promise<DNSResult> {
-    for (const resolver of this._resolvers) {
+    for (const resolver: ResolverModule of this._resolvers) {
       const result = await resolver.resolve(domain, options, bypassCache);
       if (!result.error && result.records.length) {
         return result;
@@ -39,6 +40,13 @@ export class ResolverRegistry {
   }
 
   public register(resolver: ResolverModule): void {
+    if (
+      [...this._resolvers.values()].filter(
+        (item) => item.domain === resolver.domain
+      ).length > 0
+    ) {
+      return;
+    }
     this._resolvers.add(resolver);
   }
 
@@ -48,12 +56,17 @@ export class ResolverRegistry {
 }
 
 export class ResolverModule {
-  private resolver: ResolverRegistry;
+  private _resolver: ResolverRegistry;
-  private domain: string;
 
   constructor(resolver: ResolverRegistry, domain: string) {
-    this.resolver = resolver;
+    this._resolver = resolver;
-    this.domain = domain;
+    this._domain = domain;
+  }
+
+  private _domain: string;
+
+  get domain(): string {
+    return this._domain;
   }
 
   async resolve(
@@ -61,7 +74,7 @@ export class ResolverModule {
     options: ResolverOptions,
     bypassCache: boolean
   ): Promise<DNSResult> {
-    const [ret, err] = await callModule(this.domain, "resolve", {
+    const [ret, err] = await callModule(this._domain, "resolve", {
       domain,
       options,
       bypassCache,