Validation pipe example

Author: spion

package.json

@@ -30,6 +30,8 @@
     "@types/jest": "^25.1.4",
     "@types/node": "^13.9.0",
     "@types/supertest": "^2.0.7",
+    "class-transformer": "^0.3.2",
+    "class-validator": "^0.13.1",
     "jest": "^25.1.0",
     "prettier": "^1.15.3",
     "rxjs": "^6.0.0",

src/index.spec.ts

@@ -45,6 +45,10 @@ describe("json-rpc-e2e", () => {
       expect(res).toStrictEqual({ test: "hi" });
     });
 
+    it(`should throw if sends an invalid DTO`, async () => {
+      let res = service.invokeClientService({ test: "" });
+      await expect(res).rejects.toThrow("hi");
+    });
     it(`should fail to make a request with an unauthorized JsonRpcClient`, async () => {
       let result = unauthorizedService.invokeClientService({ test: "hi" });
       await expect(result).rejects.toThrowError("Forbidden resource");

src/test-handler.ts

@@ -10,10 +10,12 @@ import {
   UseInterceptors,
   UseGuards,
   Scope,
-  Inject
+  ValidationPipe
 } from "@nestjs/common";
 import { Ctx } from "@nestjs/microservices";
 
+import { IsNotEmpty } from "class-validator";
+
 import { CodedRpcException, JsonRpcContext, RpcController, RpcMethod, RpcService } from ".";
 
 const initialModuleState = {
@@ -83,6 +85,11 @@ class TestGuard implements CanActivate {
 
 type IRpcTestService = RpcController<ITestClientService>;
 
+export class TestDto {
+  @IsNotEmpty()
+  test!: string;
+}
+
 @RpcService({
   namespace: "test"
 })
@@ -92,14 +99,6 @@ export class TestService implements IRpcTestService {
     DecorationsState.serviceConstructorCount = DecorationsState.serviceConstructorCount + 1;
   }
 
-  @UsePipes(TestPipe)
-  @UseInterceptors(TestInterceptor)
-  @UseGuards(TestGuard)
-  @RpcMethod()
-  public async invoke(params: { test: string }) {
-    return Promise.resolve(params);
-  }
-
   @UsePipes(TestPipe)
   @UseInterceptors(TestInterceptor)
   @UseGuards(TestGuard)
@@ -110,10 +109,11 @@ export class TestService implements IRpcTestService {
   }
 
   @UsePipes(TestPipe)
+  @UsePipes(ValidationPipe)
   @UseInterceptors(TestInterceptor)
   @UseGuards(TestGuard)
   @RpcMethod()
-  public async invokeClientService(params: { test: string }) {
+  public async invokeClientService(params: TestDto) {
     return Promise.resolve(params);
   }
 
@@ -131,7 +131,6 @@ export class TestService implements IRpcTestService {
 }
 
 export interface ITestClientService {
-  invoke(params: { test: string }): Promise<{ test: string }>;
   invokeClientService(params: { test: string }): Promise<{ test: string }>;
   testError(params: { errorTest: string }): Promise<void>;
   injectContext(params: {}): Promise<{ key: string | undefined }>;