WithWatchStaticMappings doesn't respect new files

[mantasburokas]

Describe the bug

"--WatchStaticMappings true" command doesn't respect new files copied. This is a bit annoying in docker in docker configuration where I can't bind mappings using WithMappings() as docker bind always references the host and not the parent container.

Expected behavior:

On new file copy static mappings are read.

Test to reproduce

    private readonly WireMockContainer _wireMockContainer = new WireMockContainerBuilder()
        .WithWatchStaticMappings(true)
        .WithPortBinding(5000, 80)
        .Build();

   await _wireMockContainer.CopyAsync($"{AppDomain.CurrentDomain.BaseDirectory}Mappings", "/app/__admin/mappings");

Check mappings or make request

Other related info

Workaround exists using admin client: await _wireMockContainer.CreateWireMockAdminClient().ResetMappingsAsync(true);

[StefH]

Sounds familiar.

Related to this?

WireMock.Net/src/WireMock.Net.Aspire/WireMockServerBuilderExtensions.cs

Line 57 in eb7e6c3

.WithEnvironment(ctx => ctx.EnvironmentVariables.Add("DOTNET_USE_POLLING_FILE_WATCHER", "1")) // https://khalidabuhakmeh.com/aspnet-docker-gotchas-and-workarounds#configuration-reloads-and-filesystemwatcher

[mantasburokas]

If that's the correct use then no dice - mappings are still empty.

    private readonly WireMockContainer _wireMockContainer = new WireMockContainerBuilder()
        .WithWatchStaticMappings(true)
        .WithPortBinding(5000, 80)
        .WithEnvironment("DOTNET_USE_POLLING_FILE_WATCHER", "1") // https://khalidabuhakmeh.com/aspnet-docker-gotchas-and-workarounds#configuration-reloads-and-filesystemwatcher 
        .Build();

[StefH]

Mmm.

• https://learn.microsoft.com/en-us/answers/questions/1539195/filewatcher-helper-system-events-not-triggered-in
• https://forums.docker.com/t/file-system-watch-does-not-work-with-mounted-volumes/12038

The only thing I can build is a simple polling to a new rest endpoint like /__admin/mappings/readStaticMappings.

[StefH]

#1189

[StefH]

@mantasburokas
Can you try 1.6.7-preview-01 ?

(Make sure to delete your local ":latest" image for WireMock.Net)

Note that I only tested on windows.

[mantasburokas]

I have deleted all existing images and containers, upgraded the package but still no mappings. Added a breakpoint on CopyAsync to observe if maybe mappings appear after some delay but they don't. I also ran the unit tests on windows.

[StefH]

Ah sorry I misunderstood your question.
I thought you were just using this to mount this folder to the internal __admin/mappings folder.

    .WithMappings($"{AppDomain.CurrentDomain.BaseDirectory}Mappings")

This has been solved in the preview version.

---

BTW, when running on windows and using a windows container, the second argument should be c:\\app\\__admin\\mappings ?

[mantasburokas]

Yeah, but I am running on windows for local setup and using linux containers. So just to re-iterate, the problem is that WithMappings() works as expected on local setup but in docker in docker configuration I can't mount the path from parent container. That's why I'd like to copy the mappings directory by hand and expect the watch flag to pick it up.

[StefH]

Can you give an example how you use these multiple docker containers?

[mantasburokas]

I can prepare a test solution but I am bit busy this week. Basically I have dockerfile that runs my tests and since my tests run in docker then wiremock becomes a docker in docker setup.

[StefH]

What happens when you just go into the WireMock.Net container and touch or create a file? Is there an update triggered? (You can checkout the logs to see this).

[StefH]

Please test new version: 1.6.7-preview-02 (make sure to delete the all local versions to be sure you get the latest)
When you do a CopyAsync after the container is started, the new mapping will be processed.

And I noticed that when using CopyAsync in a Windows Container, I get error:

filesystem operations against a running Hyper-V container are not supported