refactor: Improve argument parsing in readContract function (#749)

* refactor: Improve argument parsing in readContract function

The readContract function in the src/server/routes/contract/read/read.ts file has been refactored to improve the parsing of arguments. Previously, the function split the arguments string by comma and mapped each argument. Now, the function first tries to parse the arguments as a JSON array. If successful, it uses the parsed arguments. If parsing fails, it falls back to the previous method of splitting the string.

This change improves the flexibility and reliability of argument parsing in the readContract function.

* refactor: Update test description for reading a contract method with struct and number params

src/server/routes/contract/read/read.ts

@@ -43,7 +43,16 @@ export async function readContract(fastify: FastifyInstance) {
         contractAddress,
       });
 
-      const parsedArgs = args?.split(",").map((arg) => {
+      let parsedArgs: unknown[] | undefined = [];
+
+      try {
+        const jsonStringArgs = `[${args}]`;
+        parsedArgs = JSON.parse(jsonStringArgs);
+      } catch {
+        // fallback to string split
+      }
+
+      parsedArgs ??= args?.split(",").map((arg) => {
         if (arg === "true") {
           return true;
         }

src/server/utils/convertor.ts

@@ -1,6 +1,6 @@
 import { BigNumber } from "ethers";
 
-export const bigNumberReplacer = (value: any): string => {
+export const bigNumberReplacer = (value: any): any => {
   // if we find a BigNumber then make it into a string (since that is safe)
   if (
     BigNumber.isBigNumber(value) ||
@@ -11,5 +11,10 @@ export const bigNumberReplacer = (value: any): string => {
   ) {
     return BigNumber.from(value).toString();
   }
+
+  if (Array.isArray(value)) {
+    return value.map(bigNumberReplacer);
+  }
+
   return value;
 };

test/e2e/tests/read.test.ts

@@ -0,0 +1,38 @@
+import { beforeAll, describe, test } from "bun:test";
+import { sepolia } from "thirdweb/chains";
+import { expect } from "vitest";
+import type { setupEngine } from "../utils/engine";
+import { setup } from "./setup";
+
+const structContractAddress = "0x83ca896ef0a66d39f0e6fcc1a93c0a09366b85b1";
+const chainIdString = sepolia.id.toString();
+
+describe("Read Tests", () => {
+  let engine: ReturnType<typeof setupEngine>;
+
+  beforeAll(async () => {
+    const { engine: _engine, backendWallet: _backendWallet } = await setup();
+    engine = _engine;
+  });
+
+  test("Read a contract method with struct and number params", async () => {
+    const structValues = {
+      name: "test",
+      value: 123,
+    };
+
+    const structString = JSON.stringify(structValues);
+
+    const { result } = await engine.contract.read(
+      "readStructAndInts",
+      chainIdString,
+      structContractAddress,
+      `${structString},1,2`,
+    );
+
+    expect(result[0]).toEqual("test");
+    expect(result[1]).toEqual("123");
+    expect(result[2]).toEqual("1");
+    expect(result[3]).toEqual("2");
+  });
+});