After last night’s stream, I felt ripped off… I got all the way through building a container and running my application in it, and it didn’t work. I couldn’t sleep last night, wondering what I did wrong. So, I did what any developer would do: I investigated.
I inspected the contents of my container image from yesterday by attaching to it and running a bash shell to look around in it:
docker exec -it mycontainer bash
When I looked at the content of the /app folder, it was empty.
Alright, let’s rebuild that container. I updated the publish statement inside my dockerfile to ensure the entire contents of my application were published in a self-contained manner:
RUN dotnet publish -c Release -o /app -r linux-x64 --self-contained
When I built my container, everything was loaded properly and I was able to access the application. Success!
I wrote a simple file to disk with my private configuration settings to manage my stream, and started using the –env-file switch to load those settings as environment variables for my container. That file looked like this:
StreamServices__Twitch__Channel=csharpfritz StreamServices__Mixer__Channel=csharpfritz
I would then run my container with this command:
docker run -itd -p 8000:80 --env-file env.txt --name streamtools fritzregistry.azurecr.io/fritz.rundown
Next, I needed to tune how Mixer’s data was being loaded, because the NuGet package I grabbed was forcing me to login with OAuth in a browser window. I discovered that the endpoint to read channel information is not authenticated and I could hit it directly. This lead to me simplifying the MixerService class to use an HttpClient to query the endpoint and using a timer to periodically refresh the data. That was easy….
Finally, we built a follower-goal meter just like the one at the top of my stream. This was a simple MVC Action in the FollowersController called “Goal” and we added parameters to it that allowed it to be customized from either the application configuration, or on the URL. I could make it look JUST like my current meter with this URL:
http://localhost:8000/Followers/Goal/500/ASP.NET Core Workshop?width=800
and the following was output:
My New Gauge
Next time, we’ll do some more CSS cleanup and tuning in the project. I want to figure out how to unit test this and refactor out some other configuration to make it more general purpose. I hope you join me then!