No value was provided for parameter 'log' in Functions.RenderSwaggerUI

[johnholliday]

Describe the issue Using dependency injection, getting exception in method 'Functions.RenderSwaggerUI' when attempting to display the Swagger UI page.

To Reproduce Steps to reproduce the behavior:

1. Create an Azure Functions project including Microsoft.Azure.WebJobs.Extensions.OpenApi, and Microsoft.Extendions.Logging packages.
2. Add a derived FunctionsStartup method with 'builder.Services.AddLogging()' as the first statement.
3. Add 'ILogger<T> log' parameters as required to any HttpTrigger class constructors.
4. Compile and execute the project, copying the 'http://localhost:/api/swagger/ui' endpoint into a new browser window.
5. See the following errors in the debug console:

Executed 'Functions.RenderSwaggerUI' (Failed, Id=69e04003-c2a6-4fdb-aff6-e8266acf89dd, Duration=269ms)

System.Private.CoreLib: Exception while executing function: Functions.RenderSwaggerUI.
Microsoft.Azure.WebJobs.Host: Exception binding parameter 'log'.
Microsoft.Azure.WebJobs.Host: No value was provided for parameter 'log'.

Expected behavior Browser should display the generated Swagger UI.

Environment (please complete the following information, if applicable):

• OS: Windows 11 Version 22H2 (Build 22623.1028)
• Browser Edge
• Version 108.0.1462.54 (Official build) (64-bit)

[justinyoo]

@johnholliday Thanks for the issue. Basically, it's more Azure Functions core runtime question, though. Two questions:

1. Is there a specific reason that you add builder.Services.AddLogging()? The ILogger instance is added by default.
2. Have you tried to modify host.json to display more detailed logs on your terminal?

[johnholliday]

Thanks for responding. I tried removing the AddLogging statement - same result. I’ll increase verbosity and get back to you.

Excellent work, by the way.

---

From: Justin Yoo @.> Sent: Monday, January 30, 2023 8:32:56 AM To: Azure/azure-functions-openapi-extension @.> Cc: John Holliday @.>; Mention @.> Subject: Re: [Azure/azure-functions-openapi-extension] No value was provided for parameter 'log' in Functions.RenderSwaggerUI (Issue #529)

@johnhollidayhttps://github.com/johnholliday Thanks for the issue. Basically, it's more Azure Functions core runtime question, though. Two questions:

1. Is there a specific reason that you add builder.Services.AddLogging()? The ILogger instance is added by default.
2. Have you tried to modify host.json to display more detailed logs on your terminal?

— Reply to this email directly, view it on GitHubhttps://github.com/Azure/azure-functions-openapi-extension/issues/529#issuecomment-1408639403, or unsubscribehttps://github.com/notifications/unsubscribe-auth/ABIMPXCN2DFHKXIISEKLG6LWU67IRANCNFSM6AAAAAATOIPBNI. You are receiving this because you were mentioned.Message ID: @.***>

[johnholliday]

I removed builder.Services.AddLogging() and also increased the log verbosity to 'Trace'. No change in behavior and no additional information is provided. Clicking the /api/swagger/ui endpoint gives this:

[2023-01-31T16:54:33.229Z] Host lock lease acquired by instance ID '000000000000000000000000000B7C7E'.
[2023-01-31T16:54:33.276Z] FUNCTIONS_WORKER_RUNTIME=dotnet. Will shutdown all the worker channels that started in placeholder mode
[2023-01-31T16:54:41.344Z] Executing HTTP request: {
[2023-01-31T16:54:41.346Z]   requestId: "94d748b7-9dfa-433e-9488-cb7cea6c56cd",
[2023-01-31T16:54:41.347Z]   method: "GET",
[2023-01-31T16:54:41.347Z]   userAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36 Edg/109.0.1518.70",
[2023-01-31T16:54:41.348Z]   uri: "/api/swagger/ui"
[2023-01-31T16:54:41.348Z] }
[2023-01-31T16:54:41.486Z] Request successfully matched the route with name 'RenderSwaggerUI' and template 'api/swagger/ui'
[2023-01-31T16:54:41.608Z] Executing 'Functions.RenderSwaggerUI' (Reason='This function was programmatically called via the host APIs.', Id=c98c3966-a4aa-4e82-8499-35e060c1352c)
[2023-01-31T16:54:41.799Z] Executed 'Functions.RenderSwaggerUI' (Failed, Id=c98c3966-a4aa-4e82-8499-35e060c1352c, Duration=274ms)
[2023-01-31T16:54:41.801Z] System.Private.CoreLib: Exception while executing function: Functions.RenderSwaggerUI. Microsoft.Azure.WebJobs.Host: Exception binding parameter 'log'. Microsoft.Azure.WebJobs.Host: No value was provided for parameter 'log'.
[2023-01-31T16:54:41.849Z] Executed HTTP request: {
[2023-01-31T16:54:41.850Z]   requestId: "94d748b7-9dfa-433e-9488-cb7cea6c56cd",
[2023-01-31T16:54:41.851Z]   identities: "",
[2023-01-31T16:54:41.851Z]   status: "500",
[2023-01-31T16:54:41.852Z]   duration: "503"
[2023-01-31T16:54:41.852Z] }

For reference, here is the Startup code:

using AutoFixture;
using my.api.Configurations;
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Azure.WebJobs.Extensions.OpenApi.Core.Abstractions;
using Microsoft.Extensions.DependencyInjection;
using System.Reflection;

[assembly: FunctionsStartup(typeof(my.api.Startup))]

namespace my.api
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            builder.Services
                .AddSingleton<Fixture>(new Fixture())
                .AddSingleton<IOpenApiConfigurationOptions>(_ =>
                {
                    return new MyOpenApiConfigurationOptions();
                })
                .AddSingleton<IOpenApiHttpTriggerAuthorization>(_ =>
                {
                    return new MyOpenApiHttpTriggerAuthorization();
                })
                .AddSingleton<IOpenApiCustomUIOptions>(_ =>
                {
                    var assembly = Assembly.GetExecutingAssembly();
                    return new MyOpenApiCustomUIOptions(assembly);
                });
        }
    }
}

[johnholliday]

Any additional thoughts? I'm struggling to get this to work. Just created a separate issue (stack overflow) when displaying the page. Not sure where to turn for help.