IM_NEW/ContactService.WebApi/Application/EventHandler/FriendRequestStatusUpdateHandler.cs

using ContactService.Domain;
using ContactService.Domain.Events;
using ContactService.Domain.ValueObjects;
using ContactService.Infrastructure;
using ContactService.WebApi.Application.IntegrationServices;
using IM.Commons.IntegrationEvents;
using MassTransit;
using MediatR;

namespace ContactService.WebApi.Application.EventHandler
{
    public class FriendRequestStatusUpdateHandler : INotificationHandler<FriendRequestStateUpdateDomainEvent>
    {
        private readonly FriendDomainService friendService;
        private readonly ContactDbContext contactDb;
        private readonly IPublishEndpoint endpoint;
        private readonly IIdentityIntegrationService idService;

        public FriendRequestStatusUpdateHandler(FriendDomainService friendService, ContactDbContext contactDb, IPublishEndpoint endpoint, IIdentityIntegrationService idService)
        {
            this.friendService = friendService;
            this.contactDb = contactDb;
            this.endpoint = endpoint;
            this.idService = idService;
        }

        public async Task Handle(FriendRequestStateUpdateDomainEvent notification, CancellationToken cancellationToken)
        {
            var @event = notification.Request;
            if (@event.State == FriendRequestStatus.Passed)
            {
                var ownerInfo = await idService.FindUserByIdAsync(@event.OwnerId);
                var targetInfo = await idService.FindUserByIdAsync(@event.TargetId);

                if (!ownerInfo.Succeeded || !targetInfo.Succeeded)
                {
                    return;
                }

                var ownerProfile = new UserProfile(ownerInfo.Data.Id, ownerInfo.Data.NickName, ownerInfo.Data.Avatar);
                var targetProfile = new UserProfile(targetInfo.Data.Id, targetInfo.Data.NickName, targetInfo.Data.Avatar);

                await friendService.CreateAsync(ownerProfile, targetProfile, @event.RemarkName);
                await friendService.CreateAsync(targetProfile, ownerProfile, notification.AcceptRemarkName);
                await contactDb.SaveChangesAsync(cancellationToken);
            }

            await endpoint.Publish(new FriendRequestStateUpdateEvent
            {
                CorrelationId = @event.TargetId,
                Description = @event.Description,
                OwnerId = @event.OwnerId,
                RemarkName = @event.RemarkName,
                State = @event.State.ToString()
            });
        }
    }
}