feat: enhance onCallRequest method with request handling and hook execution

src/core/RPCSession.ts

@@ -257,9 +257,81 @@ export class RPCSession {
     }
 
     private async onCallRequest(packet: RPCPacket): Promise<RPCPacket> {
-        const request = parseCallPacket(packet);
-        if (request === null) {
+        let request = parseCallPacket(packet);
+        const instance = this;
+
+        function setRequest(req: unknown) {
+            if (!isObject(req)) {
+                return;
+            }
+            const { fnPath, args } = req;
+            if (typeof fnPath === 'string' && isArray(args)) {
+                request = {
+                    ...request,
+                    fnPath,
+                    args,
+                };
+            }
+        }
+
+        const hookRunnerContext = {
+            session: this,
+            request,
+            setRequest,
+        }
+
+
+
+        async function makeResponse(o: Parameters<typeof makeCallResponsePacket>[0]) {
+            const hookRunner = createHookRunner(instance.rpcHandler.getPlugins(), 'onCallIncoming');
+            try {
+                await hookRunner({
+                    ...hookRunnerContext,
+                    response: o,
+                    setResponse: (res: unknown) => {
+                        /** TODO: Implement stricter validation of the response object in the future */
+                        o = res as Parameters<typeof makeCallResponsePacket>[0];
+                    },
+                })
+            } catch (error) {
+                return makeCallResponsePacket({
+                    ...o,
+                    ...(error instanceof RPCError ? {
+                        errorCode: error.errorCode,
+                        reason: error.reason,
+                    } : {
+                        errorCode: RPCErrorCode.SERVER_ERROR,
+                        reason: `${error}`
+                    })
+                })
+            }
+
             return makeCallResponsePacket({
+                ...o,
+            })
+        }
+
+
+
+        const hookRunner = createHookRunner(this.rpcHandler.getPlugins(), 'onCallIncomingBefore');
+        try {
+            await hookRunner(hookRunnerContext);
+        } catch (error) {
+            return makeResponse({
+                status: 'error',
+                requestPacket: packet,
+                ...(error instanceof RPCError ? {
+                    errorCode: error.errorCode,
+                    reason: error.reason
+                } : {
+                    errorCode: RPCErrorCode.SERVER_ERROR,
+                    reason: `${error}`,
+                })
+            })
+        }
+
+        if (request === null) {
+            return makeResponse({
                 status: 'error',
                 requestPacket: packet,
                 errorCode: RPCErrorCode.CALL_PROTOCOL_ERROR,
@@ -269,7 +341,7 @@ export class RPCSession {
         // call the function
         const provider = this.rpcHandler.getProvider();
         if (!provider) {
-            return makeCallResponsePacket({
+            return makeResponse({
                 status: 'error',
                 requestPacket: packet,
                 errorCode: RPCErrorCode.PROVIDER_NOT_AVAILABLE,
@@ -279,7 +351,7 @@ export class RPCSession {
         const { fnPath, args } = request;
         const fnRes = getProviderFunction(provider, fnPath);
         if (!fnRes) {
-            return makeCallResponsePacket({
+            return makeResponse({
                 status: 'error',
                 requestPacket: packet,
                 errorCode: RPCErrorCode.METHOD_NOT_FOUND,
@@ -290,7 +362,7 @@ export class RPCSession {
         const { enableMethodProtection } = this.rpcHandler.getConfig();
         if (enableMethodProtection) {
             if (!isPublicMethod(fn)) {
-                return makeCallResponsePacket({
+                return makeResponse({
                     status: 'error',
                     requestPacket: packet,
                     errorCode: RPCErrorCode.METHOD_PROTECTED,
@@ -300,13 +372,13 @@ export class RPCSession {
 
         try {
             const result = await fn.bind(fnThis)(...args);
-            return makeCallResponsePacket({
+            return makeResponse({
                 status: 'success',
                 requestPacket: packet,
                 data: result,
             })
         } catch (error) {
-            return makeCallResponsePacket({
+            return makeResponse({
                 status: 'error',
                 requestPacket: packet,
                 errorCode: RPCErrorCode.SERVER_ERROR,