C#•3y ago

Signalr not sending message(s) to specific user(s)

in the hub i have setup this signature for a method

public async Task SendMessage(string sender, string receiver, string message)
{
      await Clients.Users(sender, receiver).SendAsync("ReceiveMessage", receiver, message);
 }

public async Task SendMessage(string sender, string receiver, string message)
{
      await Clients.Users(sender, receiver).SendAsync("ReceiveMessage", receiver, message);
 }

and in the client side(the page on blazor server) i have set this up for the ReceiveMessage method

public async Task OnInitializeAsync()
{

 if(hub is null)
            hub = new HubConnectionBuilder()
                .WithUrl(_NavigationManager.ToAbsoluteUri("/ConnectionsHub"))
                .Build();
    hub.On<string, string>($"ReceiveMessage",  // this is never triggered
        async (sender, message) =>
        {
            var encodedMsg = $"{sender}: {message}";
            ChatBox.MessageList.Add(encodedMsg);
            await ChatBox.ComponentStateHasChanged();
        });
        hub.ServerTimeout = TimeSpan.FromMilliseconds(100000);
        await hub.StartAsync();
}

public async Task OnInitializeAsync()
{

 if(hub is null)
            hub = new HubConnectionBuilder()
                .WithUrl(_NavigationManager.ToAbsoluteUri("/ConnectionsHub"))
                .Build();
    hub.On<string, string>($"ReceiveMessage",  // this is never triggered
        async (sender, message) =>
        {
            var encodedMsg = $"{sender}: {message}";
            ChatBox.MessageList.Add(encodedMsg);
            await ChatBox.ComponentStateHasChanged();
        });
        hub.ServerTimeout = TimeSpan.FromMilliseconds(100000);
        await hub.StartAsync();
}

and how I call this method

private async Task SendMessage(string message)
    {
        if(string.IsNullOrEmpty(message))
        {
            await PrintMessage("Error", "Cannot send an empty message");
            return;
        }
        if (hub is not null)
        {

            foreach (var user in _UserList)
            {
                await hub.SendAsync("SendMessage", ThisUser.Email, user.User.Email,ChatBox.Message);
            }

          // await  ChatBox.ComponentStateHasChanged();
        }
    }

private async Task SendMessage(string message)
    {
        if(string.IsNullOrEmpty(message))
        {
            await PrintMessage("Error", "Cannot send an empty message");
            return;
        }
        if (hub is not null)
        {

            foreach (var user in _UserList)
            {
                await hub.SendAsync("SendMessage", ThisUser.Email, user.User.Email,ChatBox.Message);
            }

          // await  ChatBox.ComponentStateHasChanged();
        }
    }

68 Replies

Yawnder•3y ago

@PontiacGTX Right now, what is your problem? Your message isn't received by the user, or it's received by too many users?

PontiacGTXOP•3y ago

it isnt recieved by me (who sent it) it moves into the SendAsync method in SendMessage and then it doesnt trigger the Action (I am the sender and the receiving user)

Yawnder•3y ago

Have you debugged the service for when you connect with the client to make sure that part works, and when you try to send a message to the user, what's the value you're using for it's client?

PontiacGTXOP•3y ago

some ranodm string but i see that the client is repeated twice maybe i shoudl use an if else

Yawnder•3y ago

A random string? How do you expect that to work?

PontiacGTXOP•3y ago

if it is the use myself only send it to me and not twice my username i mean the message is what i have sent (some random thing) lol

Yawnder•3y ago

Ok, but I'm talking about the recipient. What's the value? You're actually sending the message twice, once to the recipient and once to the sender.

PontiacGTXOP•3y ago

my username in identity i am senidn ti twice yeah but not receiving it once

Yawnder•3y ago

Then that's probably the problem. SignalR doesn't care about your identity itself, it wants the clientId.

PontiacGTXOP•3y ago

mmm

PontiacGTXOP•3y ago

then this doesnt work ?https://stackoverflow.com/a/63771575/13794072

Stack Overflow

SignalR - Sending a message to a specific user using (IUserIdProvid...

In the latest version of Asp.Net SignalR, was added a new way of sending a message to a specific user, using the interface "IUserIdProvider". public interface IUserIdProvider { string GetUserId(

PontiacGTXOP•3y ago

await _userManager.AddClaimAsync(user, new Claim(ClaimTypes.Email, Model.Email)); this line

Yawnder•3y ago

Did you create and register the CustomEmailProvider? (And is the email part of the claims of the user?)

PontiacGTXOP•3y ago

well i dont know if i setup the custom email provider where do i set it?

Yawnder•3y ago

It's in the SO post.

PontiacGTXOP•3y ago

i have this

builder.Services
    .AddDbContext<AppDbContext>(options => { options.UseNpgsql(conString); })
    .AddIdentity<AppUser, IdentityRole>(options => 
    {
        options.SignIn.RequireConfirmedAccount = true;
        options.SignIn.RequireConfirmedEmail = true; 
        options.User.RequireUniqueEmail = true;
    })
    .AddUserStore<AppUserStore>()
    .AddDefaultUI()
    .AddSignInManager()
    .AddEntityFrameworkStores<AppDbContext>()
    .AddTokenProvider<DataProtectorTokenProvider<AppUser>>(TokenOptions.DefaultProvider);

builder.Services
    .AddDbContext<AppDbContext>(options => { options.UseNpgsql(conString); })
    .AddIdentity<AppUser, IdentityRole>(options => 
    {
        options.SignIn.RequireConfirmedAccount = true;
        options.SignIn.RequireConfirmedEmail = true; 
        options.User.RequireUniqueEmail = true;
    })
    .AddUserStore<AppUserStore>()
    .AddDefaultUI()
    .AddSignInManager()
    .AddEntityFrameworkStores<AppDbContext>()
    .AddTokenProvider<DataProtectorTokenProvider<AppUser>>(TokenOptions.DefaultProvider);

then builder.Services.AddSingleton<IUserIdProvider, CustomEmailProvider>(); builder.Services.AddSignalR();

public class CustomEmailProvider : IUserIdProvider
    {
        public virtual string GetUserId(HubConnectionContext connection)
        {
            return connection.User?.FindFirst(ClaimTypes.Email)?.Value;
        }
    }

public class CustomEmailProvider : IUserIdProvider
    {
        public virtual string GetUserId(HubConnectionContext connection)
        {
            return connection.User?.FindFirst(ClaimTypes.Email)?.Value;
        }
    }

Yawnder•3y ago

Oh, then you have the custom email provider. If you put a breakpoint in there, what happens?

PontiacGTXOP•3y ago

PontiacGTXOP•3y ago

just starting up (i havent sent anything)

Yawnder•3y ago

Humn... what's the value of res?

PontiacGTXOP•3y ago

loggged int

PontiacGTXOP•3y ago

it skips it i think this is wrong let me try something different var res = connection.User?.Claims.FirstOrDefault(x=>x.Type==ClaimTypes.Email)?.Value; this worked somehow the other method didnt lol

Yawnder•3y ago

Good. Then res is a Guid (well, string representation) and your message gets sent?

PontiacGTXOP•3y ago

it si my username

 public virtual string GetUserId(HubConnectionContext connection)
        {

            var res = connection.User?.Claims.FirstOrDefault(x=>x.Type==ClaimTypes.Email && x.Value == connection.User.Identity.Name);
            return res?.Value;
        }

 public virtual string GetUserId(HubConnectionContext connection)
        {

            var res = connection.User?.Claims.FirstOrDefault(x=>x.Type==ClaimTypes.Email && x.Value == connection.User.Identity.Name);
            return res?.Value;
        }

so my email

Yawnder•3y ago

That's not what you want.

PontiacGTXOP•3y ago

why?? oh well i see the method says the Id connection User contains the id also i would like to use my email a smy idnetifier but if you say i must return the id...

Yawnder•3y ago

Well, I might be wrong. I always used the plain SignalR UserId. Give me a sec to read on it. OH! Nevermind, it's now how I thought it was. It must return the email, you're right What it's doing is not "map the email to the userId". It's, when a connection is established, SignalR asks that provider "What do you want me to use as Id" So to recap: This must return your email in your context.

PontiacGTXOP•3y ago

well in my context let me check

PontiacGTXOP•3y ago

PontiacGTXOP•3y ago

this si what the context returns no user

Yawnder•3y ago

But you're not in the same context there.

PontiacGTXOP•3y ago

where do you want me to check the context

Yawnder•3y ago

In the code of the UserIdProvider, it's when you're establishing the connection as the user. There, you were sending the message. In GetUserId, the value returned is the email now, right? (if you put a breakpoint and check when you establish the connection.)

PontiacGTXOP•3y ago

i mean it does only when I login

Yawnder•3y ago

Of course

PontiacGTXOP•3y ago

i have a cascade parameter on my nav and on my body fragment but wheni click to send the message it just doesnt moves onto GetUserId

Yawnder•3y ago

Wait, you're losing me. What are you talking about now? No, it's ok. It's when the SignalR connection is established only.

PontiacGTXOP•3y ago

I am talking about triggering the SendMessage method oh well so where do i check that the user is within the context it isnt in the hub on the server? .

MODiX•3y ago

Yawnder#7904

In GetUserId, the value returned is the email now, right?

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PontiacGTXOP•3y ago

it does

Yawnder•3y ago

Great

PontiacGTXOP•3y ago

but then it doesnt really send the mssage

Yawnder•3y ago

Not at that moment no. Now, when you send the message, you send the same email address as recipient, correct?

PontiacGTXOP•3y ago

yeah who is myself who sends it

Yawnder•3y ago

And you still don't receive messages, right?

PontiacGTXOP•3y ago

PontiacGTXOP•3y ago

i dont recieve anything i wrote it like this and nothing triggers this

PontiacGTXOP•3y ago

PontiacGTXOP•3y ago

this action doesnt trigger this method

Yawnder•3y ago

You have a breakpoint in HubOnReceiveMessage... and it doesn't get hit? Ok

PontiacGTXOP•3y ago

it doesnt

Yawnder•3y ago

In your hub, add this override and put a breakpoint in there: public override async Task OnDisconnectedAsync(Exception exception) Also, in SendMessage, can you check the content of Clients and see if you still have some.

PontiacGTXOP•3y ago

PontiacGTXOP•3y ago

PontiacGTXOP•3y ago

user seems null

Yawnder•3y ago

If you send to Clients.All, does it work?

PontiacGTXOP•3y ago

i will restart again and check that out yes it works so why it isnt binding the user to the email

Yawnder•3y ago

Then I don't know. I would have to try it and play around

PontiacGTXOP•3y ago

can i send you my repository?

Yawnder•3y ago

I don't really have the time for that, sorry

PontiacGTXOP•3y ago

so what can I do to make sure that it beinds the userid to the email

Yawnder•3y ago

No idea. As I said, I always worked with the raw UserId. Maybe if you put a breakpoint in SendMessage and you check this.Users to see what's in there.

PontiacGTXOP•3y ago

this.Clients?

Yawnder•3y ago

There is no list of users?

PontiacGTXOP•3y ago

Users isa method that calls certain users

PontiacGTXOP•3y ago

PontiacGTXOP•3y ago

there is a connection but no claims or users

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Signalr not sending message(s) to specific user(s)