send messages on CUD

src/modules/users/domain/interfaces/user-messager.ts

@@ -0,0 +1,12 @@
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export abstract class IMessageUser {
+  exchange: string;
+
+  constructor(exchange: string) {
+    this.exchange = exchange;
+  }
+
+  abstract publish(routingKey: string, message: string): void;
+}

src/modules/users/domain/usecases/create-user.usecase.ts

@@ -1,6 +1,7 @@
 import { Mapper } from '@automapper/core';
 import { InjectMapper } from '@automapper/nestjs';
 import { CommandHandler } from '@nestjs/cqrs';
+import { UserMessager } from '../../adapters/secondaries/user.messager';
 import { UsersRepository } from '../../adapters/secondaries/users.repository';
 import { CreateUserCommand } from '../../commands/create-user.command';
 import { CreateUserRequest } from '../dtos/create-user.request';
@@ -10,6 +11,7 @@ import { User } from '../entities/user';
 export class CreateUserUseCase {
   constructor(
     private readonly _repository: UsersRepository,
+    private readonly _messager: UserMessager,
     @InjectMapper() private readonly _mapper: Mapper,
   ) {}
 
@@ -20,6 +22,12 @@ export class CreateUserUseCase {
       User,
     );
 
-    return this._repository.create(entity);
+    const user = await this._repository.create(entity);
+
+    if (user) {
+      this._messager.publish('user.create', JSON.stringify(user));
+    }
+
+    return user;
   }
 }

src/modules/users/domain/usecases/delete-user.usecase.ts

@@ -1,12 +1,26 @@
 import { CommandHandler } from '@nestjs/cqrs';
+import { UserMessager } from '../../adapters/secondaries/user.messager';
 import { UsersRepository } from '../../adapters/secondaries/users.repository';
 import { DeleteUserCommand } from '../../commands/delete-user.command';
+import { User } from '../entities/user';
 
 @CommandHandler(DeleteUserCommand)
 export class DeleteUserUseCase {
-  constructor(private readonly _repository: UsersRepository) {}
+  constructor(
+    private readonly _repository: UsersRepository,
+    private readonly _messager: UserMessager,
+  ) {}
 
-  async execute(command: DeleteUserCommand): Promise<void> {
-    return this._repository.delete(command.uuid);
+  async execute(command: DeleteUserCommand): Promise<User> {
+    const user = await this._repository.delete(command.uuid);
+
+    if (user) {
+      this._messager.publish(
+        'user.delete',
+        JSON.stringify({ uuid: user.uuid }),
+      );
+    }
+
+    return user;
   }
 }

src/modules/users/domain/usecases/update-user.usecase.ts

@@ -1,6 +1,7 @@
 import { Mapper } from '@automapper/core';
 import { InjectMapper } from '@automapper/nestjs';
 import { CommandHandler } from '@nestjs/cqrs';
+import { UserMessager } from '../../adapters/secondaries/user.messager';
 import { UsersRepository } from '../../adapters/secondaries/users.repository';
 import { UpdateUserCommand } from '../../commands/update-user.command';
 import { UpdateUserRequest } from '../dtos/update-user.request';
@@ -10,6 +11,7 @@ import { User } from '../entities/user';
 export class UpdateUserUseCase {
   constructor(
     private readonly _repository: UsersRepository,
+    private readonly _messager: UserMessager,
     @InjectMapper() private readonly _mapper: Mapper,
   ) {}
 
@@ -20,6 +22,17 @@ export class UpdateUserUseCase {
       User,
     );
 
-    return this._repository.update(command.updateUserRequest.uuid, entity);
+    const user = await this._repository.update(
+      command.updateUserRequest.uuid,
+      entity,
+    );
+
+    if (user) {
+      this._messager.publish(
+        'user.update',
+        JSON.stringify(command.updateUserRequest),
+      );
+    }
+    return user;
   }
 }