Templated QueueTrigger name fails to resolve in 3.0.3.

Defining a [QueueTrigger("%InputQueue%")] fails to resolve the InputQueue from the App.config appSettings.

Repro steps

Provide the steps required to reproduce the problem

1. Add an App.config setting in appSettings for InputQueue, e.g. <add key="InputQueue" value="queue" />

2. Set the QueueTriggerAttribute to use the templated value, e.g. [QueueTrigger("%InputQueue%")]

Expected behavior

Prior to 3.0.*, the queue trigger would pick up the queue name from the App.config appSettings.

Actual behavior

Runtime exception:

Unhandled Exception: Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexingException: Error indexing method 'Functions.processQueueMessage' ---> System.InvalidOperationException: '%InputQueue%' does not resolve to a value.
   at Microsoft.Azure.WebJobs.Host.NameResolverExtensions.ResolveWholeStringCore(INameResolver resolver, String resolve, Boolean throwOnFailure) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\NameResolverExtensions.cs:line 99
   at Microsoft.Azure.WebJobs.Host.NameResolverExtensions.ResolveWholeString(INameResolver resolver, String resolve) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\NameResolverExtensions.cs:line 36
   at Microsoft.Azure.WebJobs.Host.Queues.Triggers.QueueTriggerAttributeBindingProvider.Resolve(String queueName) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Extensions.Storage\Queues\Triggers\QueueTriggerAttributeBindingProvider.cs:line 99
   at Microsoft.Azure.WebJobs.Host.Queues.Triggers.QueueTriggerAttributeBindingProvider.TryCreateAsync(TriggerBindingProviderContext context) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Extensions.Storage\Queues\Triggers\QueueTriggerAttributeBindingProvider.cs:line 61
   at Microsoft.Azure.WebJobs.Host.Triggers.CompositeTriggerBindingProvider.TryCreateAsync(TriggerBindingProviderContext context) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Triggers\CompositeTriggerBindingProvider.cs:line 22
   at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.IndexMethodAsyncCore(MethodInfo method, IFunctionIndexCollector index, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 190
   at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.IndexMethodAsync(MethodInfo method, IFunctionIndexCollector index, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 167
   --- End of inner exception stack trace ---
   at Microsoft.Azure.WebJobs.Host.RecoverableException.TryRecover(ILogger logger) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Exceptions\RecoverableException.cs:line 83
   at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.IndexTypeAsync(Type type, IFunctionIndexCollector index, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 112
   at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexProvider.CreateAsync(CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexProvider.cs:line 79
   at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexProvider.GetAsync(CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexProvider.cs:line 64
   at Microsoft.Azure.WebJobs.Host.Executors.JobHostContextFactory.Create(CancellationToken shutdownToken, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\JobHostContextFactory.cs:line 101
   at Microsoft.Azure.WebJobs.JobHost.InitializeHostAsync(CancellationToken cancellationToken, TaskCompletionSource`1 initializationTask) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\JobHost.cs:line 359
   at Microsoft.Azure.WebJobs.JobHost.StartAsyncCore(CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\JobHost.cs:line 99
   at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)
   at WebJobExample.Program.main(String[] argv) in C:\Code\fsharp-azure-webjob\WebJobExample\Program.fs:line 19

Known workarounds

None.

Related information

• Package version: Microsoft.Azure.WebJobs.Core 3.0.3
• Links to source: https://github.com/panesofglass/fsharp-azure-webjob/tree/webjobs3.0

[panesofglass]

@ranouf, the above is F#. For C#, the following should work:

class ConfigNameResolver : INameResolver
{
    public string Resolve(string name)
    {
        return ConfigurationManager.AppSettings[name];
    }
}

class Program
{
    public static void Main(string[] args)
    {
        var configNameResolver = new ConfigNameResolver();
        var builder =
            new HostBuilder()
                .ConfigureServices(services =>
                    // This seems to correctly add the name resolver for the QueueTrigger
                    services.AddSingleton(configNameResolver);
                );
        using (var host = builder.Build())
        {
            host.Run();
        }
    }
}

[MirzaMerdovic]

Thanks @panesofglass I can confirm that I have this same issue when trying to run Azure Durable Function in Linux Container and I had to do the same workaround. Although my INameResolver implementation is the same as the DeafaultNameResolver in Azure WebJobs, but I had to include the “Values” prefix in order to retrieve the value _configuration[$"Values:{name}"], of course this implies that the values are under AppSettings.Values inside appsettings.json.