# Azure Service Bus

## Azure Service Bus Demo

This demo will allow you to connect to service bus and retrieve messages. It's configured only for 1 concurrent message at a time, but is easily configurable.

Setup and configuration for your service bus can be done on the [Azure Portal](https://portal.azure.com).

## Azure Service Bus Setup

1. Install the package: `Azure.Messaging.ServiceBus`
2. Then [install perigee](/getting-started/installation-and-project-setup.md)
3. Copy the code over and configure the settings
4. Run and modify!

```csharp
PerigeeApplication.ApplicationNoInit("SPA", (c) =>
{
    //Service processor
    c.AddAsync("Service Processor", async (ct, l) => {

        await using var clientSB = new ServiceBusClient(c.GetValue<string>("SPA:queueConnection"));
        await using ServiceBusProcessor processor = clientSB.CreateProcessor(c.GetValue<string>("SPA:queueName"), 
            new ServiceBusProcessorOptions { AutoCompleteMessages = false, MaxConcurrentCalls = 1 }
            );

        //When a message is received:
        processor.ProcessMessageAsync += async (args) =>
        {
            //TODO: Write process code here!!
            
            //Then complete
            await args.CompleteMessageAsync(args.Message);
            
            //Or abandon
            //await args.AbandonMessageAsync(args.Message); 
        };
        
        //When an uncaught error is thrown, (write good code and don't let this happen!)
        processor.ProcessErrorAsync += (args) =>
        {
            var l = c.GetLogger<ServiceBusProcessor>();
            l.LogError("Error: {Source}", args.ErrorSource);
            l.LogError("Error: {FQN}", args.FullyQualifiedNamespace);
            l.LogError("Error: {Entity}", args.EntityPath);
            l.LogError("Error: {Exception}", args.Exception.ToString());
            return Task.CompletedTask;
        };

        //Start the process and delay until cancelled
        await processor.StartProcessingAsync(ct);
        while (PerigeeApplication.delayOrCancel(5000, ct)) { }

        //Cancel request: DO NOT send token here, it will cancel the cancel operation.
        await processor.StopProcessingAsync();
        l.LogInformation("Processor stop completed");
        
    }).LinkToConfig("SPA:enabled");
});
```

And the <mark style="color:red;">**appsettings.json**</mark>:

```json
{
  "ConnectionStrings": {    
  },
  "SPA": {
    "queueConnection": "Endpoint=sb://abcdefg.servicebus.windows.net/;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=ReplaceMe",
    "queueName": "myqueuedemo1",
    "enabled": true,
  },
  "Perigee": { "HideConsole": false },
  "Serilog": {
    "MinimumLevel": "Information",
    "WriteTo": [
      {
        "Name": "Console",
        "Args": {
          "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}]({ThreadName}) {Message:lj}{NewLine}{Exception}"
        }
      }
    ]
  }
}
```


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