*Add rpcError helper method and change all rpc error handling to the function and use error constants

src/rpc/algorand.ts

@@ -3,8 +3,13 @@ import minimatch from "minimatch";
 // @ts-ignore
 import HTTPClient from "algosdk/dist/cjs/src/client/client.js";
 import { sprintf } from "sprintf-js";
-import { RpcMethodList } from "./index.js";
+import { rpcError, RpcMethodList } from "./index.js";
 import config from "../config.js";
+import {
+  ERR_ENDPOINT_INVALID,
+  ERR_INVALID_CHAIN,
+  ERR_METHOD_INVALID,
+} from "../error.js";
 
 const allowedEndpoints: { [endpoint: string]: ("GET" | "POST")[] } = {
   "/v2/teal/compile": ["POST"],
@@ -21,12 +26,12 @@ export function proxyRestMethod(
     let chainId = maybeMapChainId(chain);
 
     if (!chainId) {
-      throw new Error("Invalid Chain");
+      return rpcError(ERR_INVALID_CHAIN);
     }
 
     chainId = reverseMapChainId(chainId as string);
     if (!chainId || chainId !== matchChainId) {
-      throw new Error("Invalid Chain");
+      return rpcError(ERR_INVALID_CHAIN);
     }
 
     let method = args.method ?? false;
@@ -55,7 +60,7 @@ export function proxyRestMethod(
     }
 
     if (!found) {
-      throw new Error("Endpoint Invalid");
+      return rpcError(ERR_ENDPOINT_INVALID);
     }
 
     let apiUrl;
@@ -79,7 +84,7 @@ export function proxyRestMethod(
         resp = await client.post(endpoint, data, { ...fullHeaders });
         break;
       default:
-        throw new Error("Method Invalid");
+        return rpcError(ERR_METHOD_INVALID);
     }
 
     const getCircularReplacer = () => {

src/rpc/common.ts

@@ -53,13 +53,13 @@ export function proxyRpcMethod(
     }
 
     if (!chainId || !chainMatch) {
-      throw new Error("Invalid Chain");
+      return rpcError(ERR_INVALID_CHAIN);
     }
 
     if (usePocketGateway()) {
       chainId = reverseMapChainId(chainId as string);
       if (!chainId) {
-        throw new Error("Invalid Chain");
+        return rpcError(ERR_INVALID_CHAIN);
       }
 
       let provider: RpcProviderMethod | boolean =
@@ -117,3 +117,11 @@ function getRpcProvider(chain: string): RpcProviderMethod {
 
   return gatewayMethods.default(chain);
 }
+
+class RpcError extends Error {
+  public code: number = -1;
+}
+
+export function rpcError(message: string): Promise<RpcError> {
+  return Promise.reject(new RpcError(message));
+}

src/rpc/handshake.ts

@@ -1,13 +1,13 @@
 //const require = createRequire(import.meta.url);
 //import { createRequire } from "module";
 
-import { RpcMethodList } from "./index.js";
+import { rpcError, RpcMethodList } from "./index.js";
 // @ts-ignore
 import rand from "random-key";
 // @ts-ignore
 import SPVNode from "hsd/lib/node/spvnode.js";
 import config from "../config.js";
-import { ERR_NOT_READY } from "../error.js";
+import { ERR_INVALID_CHAIN, ERR_NOT_READY } from "../error.js";
 // @ts-ignore
 import { NodeClient } from "hs-client";
 
@@ -78,10 +78,10 @@ if (!config.bool("hsd-use-external-node")) {
 const hnsClient = new NodeClient(clientArgs);
 
 export default {
-  getnameresource: async function (args: any, context: object) {
+  getnameresource: async (args: any, context: object) => {
     // @ts-ignore
     if ("hns" !== context.chain) {
-      throw new Error("Invalid Chain");
+      throw rpcError(ERR_INVALID_CHAIN);
     }
 
     let resp;
@@ -93,8 +93,10 @@ export default {
       const eMessage = e.message.toLowerCase();
 
       if (eType === "rpcerror" && eMessage.includes("chain is not synced")) {
-        return Promise.reject({ ...e, message: ERR_NOT_READY });
+        return rpcError(ERR_NOT_READY);
       }
+
+      return rpcError(eMessage);
     }
 
     return resp;