Azure Functions isolated .Net 6.0 + SignalR - azure

Question

My goal is to:
In scheduled functions - add message to SignalR
In SPA application (vue.js) subscribe to the event and call API to update the view
For now I'm trying to get anything to/from SignalR in my Function app (isolated, .net 6.0).
What I have in a function app:
[Function("negotiate")]
public HttpResponseData Negotiate(
[HttpTrigger(AuthorizationLevel.Anonymous, "post")] HttpRequestData req,
[SignalRConnectionInfoInput(HubName = "AdminHub", ConnectionStringSetting = "AzureSignalRConnectionString")] SignalRConnectionInfo connectionInfo)
{
_logger.LogInformation($"SignalR Connection URL = '{connectionInfo.Url}'");
var response = req.CreateResponse(HttpStatusCode.OK);
response.Headers.Add("Content-Type", "text/plain; charset=utf-8");
response.WriteString($"Connection URL = '{connectionInfo.Url}'");
return response;
}
}
[Function("SendMessage")]
[SignalROutput(HubName = "AdminHub", ConnectionStringSetting = "AzureSignalRConnectionString")]
public SignalRMessage SendMessage(
[HttpTrigger(AuthorizationLevel.Anonymous, "get")] Microsoft.Azure.Functions.Worker.Http.HttpRequestData req)
{
return
new SignalRMessage
{
Target = "cancelToHandle",
MethodName = "cancelToHandle",
Arguments = new[] { "hello" }
};
}
[Function("SignalRTest")]
public static async Task SignalRTest([SignalRTrigger("AdminHub", "messages", "cancelToHandle", ConnectionStringSetting = "AzureSignalRConnectionString")] string message, ILogger logger)
{
logger.LogInformation($"Receive {message}.");
}
Negotiate function is not called. When should it be called?
If I call SendMessage, no error, but nothing happens in SignalR service. Should I see connections and messages there? (zero in the Metrics for now).
I've tried to create a test "emulator" client - just a console application:
var url = "http://<azureSignalRUrl>/AdminHub";
var connection = new HubConnectionBuilder()
.WithUrl(url)
.WithAutomaticReconnect()
.Build();
// receive a message from the hub
connection.On<string, string>("cancelToHandle", (user, message) => OnReceiveMessage(user, message));
await connection.StartAsync();
// send a message to the hub
await connection.InvokeAsync("SendMessage", "ConsoleApp", "Message from the console app");
void OnReceiveMessage(string user, string message)
{
Console.WriteLine($"{user}: {message}");
}
and it throws the exception ": 'A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. (:80)'
I think I'm missing overall understanding of what is supposed to happen:
when should negotiate function be triggered
can I see messages that I send in Azure portal (in SignalR service)?
how can I easily receive them in testing purposes
what do parameters/properties mean (target / method name / category). Example:
SignalRTriggerAttribute has the following constructor
public SignalRTriggerAttribute(string hubName, string category, string #event, params string[] parameterNames);
and Output binding receives any custom model I create?
which settings should be set in SignalR service - for now all I set it Serverless mode + CORS

Answer 1

Here are the few link which will help in using SignalIr service extension in functions
Using SignalIr service extension
https://github.com/Azure/azure-functions-dotnet-worker/blob/main/samples/Extensions/SignalR/SignalRFunction.cs
Below is the sample link for triggering negotiate function
https://github.com/Log234/azure-functions-signalr-dotnet-isolated-demo/blob/main/SignalRDemo/NegotiationFunctions.cs
for complete understanding of SignalIR here is the Github and MS document.