Learning Ktor In 7 Days (server side Kotlin)
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- čas přidán 25. 07. 2024
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Learning Ktor in 7 days was not something I thought was possible, but to my surprise I was able to do it. For those unaware, ktor is an asynchronous framework for creating microservices, web applications, and APIs. This backend framework for Kotlin is fun, free, and open source. Basically if you are using Kotlin spring boot, you are doing it wrong. If you want to check out the finished project go to engel.dev
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📝 DESCRIPTION 📝
Ktor is a networking framework for Kotlin that allows you to build servers and clients. Ktor clients are multiplatform ready which allows sharing code between Android, iOS, and JavaScript, while we don't cover that in this video it is a really unique feature that is worth mentioning.
If you are looking at how to become an expert in Ktor this video won't have all of the answers, although it will help you with getting started with Ktor.
We start out by walking through the official tutorial for creating HTTP APIs with Ktor, followed by writing my first API to retrieve recent CZcams videos. I also take a detour to add Google Cloud Datastore as a light caching layer.
On the third day I wanted to focus on how to run Ktor inside of a Docker container and in the span of 30 minutes I was doing just that. With a lot of extra time I decided to deploy Ktor to Google Cloud Run and also had the chance to use Google Cloud Build.
The fourth day had me creating another API, this time it was for adding email addresses to my Mailchimp account. At this point I had to learn more about error handling with Ktor and also added some much needed instrumentation.
The fifth and final day was deployment day. I packaged everything up and pushed it up to Google Cloud Run. I also deployed my static website to Google Cloud Storage and set up a load balancer to direct traffic correctly.
📚 RESOURCES 📚
Website - engel.dev
Source Code - github.com/CodyEngel/EngelDev
Creating HTTP APIs with Ktor - ktor.io/docs/creating-http-ap...
Ktor with Docker - ktor.io/docs/docker.html
Hosting a static website with Google Cloud Storage - cloud.google.com/storage/docs...
Deploying container images to Google Cloud Run - cloud.google.com/run/docs/dep...
⏰ TIMESTAMPS ⏰
0:00 - Intro
0:45 - The Ktor HTTP APIs Tutorial
4:12 - Recent CZcams Videos with Ktor
7:32 - Running Ktor Inside of Docker
9:38 - Email Marking with Ktor
12:02 - Deploying Ktor to Google Cloud Run
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What service are you going to build with ktor?
hello sir, i have a basic app requirements to create an app that work in all platforms, the app must work offline and the data is backup time to time to the cloud.
Sir i am thanking to create an android app with kotlin and ktor to create server and client in the same app and create ktor server to serve the server and web client for other platforms that are connected to the same local network to access the server with local ip address.
My question is, is it possible to host kotlin web server from android that serve the same sqlite database and other resources that android app uses?
Please help to start my project.
thanks.
@@Basirafeef everything you mentioned is possible, even easier with ktor
This is the best programming video I've seen on youtube. You explained your thought process and how to follow tutorials the right way. I was actually trying to find videos like yours where an expert shares their real experience instead of giving general advice so thanks
Great video!!! It's been a while since I've done anything with Kotlin. Might have to check out ktor!
Thanks Dorian. Ktor is pretty awesome, I was learning Golang for service development but I think ktor fits the bill for most things now. Startup time is the only downside, I’d probably still use Go for a service that I want to scale up and down relatively quickly
Loved ur video. Thx man! Good luck in future!
Thank you for the words of encouragement Timur :)
Pretty good video my man, thanks for that. You just got a new subscriber.
Awesome, thank you!
4:10 AYO DATS ME. But for real, this is insane quality 👀 nicely done my man
Thanks man that means a lot ☺️
Hi Cody, great quality videos! Next video, if not already made, is tips on the path of SDE 1 to senior like what you should be doing at work and off-work, habits, etc.
Great suggestion!
Nice. Loved the fast tempo.
Thanks Danny, I tried to make it a bit quicker so happy it worked ☺️
Great video...How do we create preflight request? Can you elaborate more on how to handle CORS in ktor?
Thanks for the video man ❤️✌️
How is ktor so far? Did you use any kind of user authentification in your server?
Hope you do more videos like this one ✌️✌️
Beast!
Thanks 🙏
Thanks for the inspiration.
Kyle thank you so much for the super thanks! I've been taking a bit of a break from CZcams as there has been some personal stuff going on but please feel free to drop by the Discord if you haven't already. 🙇♂️
while creating container it gives me this error
Failed to deploy ' Dockerfile: Dockerfile': Can't retrieve image ID from build stream
Couple thing I added to my Ktor environments is Koin for DI and JetBrains - Exposed Framework for Database connection.
Kotlin makes is so easy to integrate all of it.
Also couple added extension methods make it easy to read path's parameter values or query values.
Nice! Dependency injection is on my todo list, I was probably going with Dagger but still need a better feel for what they might look like.
@@CodyEngelCodes I found it Koin to be easier to understand and use.
Very nice video. I tried to learn ktor yesterday, and after 6 failed attempts, I almost gave up. Just kept running into errors that I couldn't seem to solve. Gonna give it another try after watching this video
You can do it!
Thank you for this run down. Gives me some hope lol
You are welcome!
hello sir, i have a basic app requirements to create an app that work in all platforms, the app must work offline and the data is backup time to time to the cloud.
Sir i am thanking to create an android app with kotlin and ktor to create server and client in the same app and create ktor server to serve the server and web client for other platforms that are connected to the same local network to access the server with local ip address.
My question is, is it possible to host kotlin web server from android that serve the same sqlite database and other resources that android app uses?
Please help to start my project.
thanks.
There have a specific plugin for ktor in intellij idea.
Hi Cody, I played around with Kotlin and I fell in love with the language. It is strongly typed and it feels like JavaScript for some reason. But for the past 3 months I've been using Django for my backend. I've been thinking about learning Ktor because I am interested in Android Development with Kotlin. To be honest Ktor sounds more complicated than Django. I was thinking are you able to create an Android app with Kotlin and Android Studio and afterwards create the API with Django for an Android project? Or would you recommend learning Ktor for Android Development? Thanks.
If Django suits your needs then by all means make use of it. There's no need to use ktor for an Android project, there are some benefits with code reuse and such but doesn't make sense if it'll over complicate your project.
@@CodyEngelCodes I never used another back end library or framework before Django is my first. So far I noticed if you learn the Django way of doing things it is not so complicated. I haven't reached this point yet for my project but I think the hardest part is introducing your API to you're Android app. I guess I will figure that out once I reach that point.
But thanks for sharing you're thoughts on Ktor looks interested but more complicated than Django.
How can I access my API from anywhere on the web except on my localhost?
Deploy it to a server, check out my video on GitHub Actions because that's where I set up a CI pipeline to deploy my API automatically to Google Cloud.
Is Ktor and Kotlin good to develop large-scale android application?
I haven't used ktor in an Android application but I don't see why you couldn't. Kotlin is definitely the way to go for modern Android development though.
Can u explain how to handle refresh token in ktor???
I'd recommend checking out the authentication and authorization section on the ktor docs: ktor.io/docs/auth.html#bearer
can you make a video on creating a project using ktor and kotlin
I can try to get around to it. I do want to have a dedicated ktor course in the future.
@@CodyEngelCodes Awesome!
Okay. Very interesting. Great video. Your skills are awesome. Here are a couple of comments that spring to mind: I think Kotlin is well positioned to become a very popular general purpose language that could be used for pretty much anything. This is definitely one to watch. Second point: I see this implementation of Kotlin as being in direct competition to something like NodeJS. Finally, the demo was incredibly impressive for sure. However, there are two things that would stop me from jumping in with KTOR; 1). I would have concerns about it potentially having a shortage of libraries (I'm sure that won't always be the case). 2). Reverting to VueJS seems like a step backwards to me. The 'javascript-type' websites are commercially weak because they tend to perform poorly on search engines. Actually, I think that it's a sort of out-dated way to do web development. Nevertheless, I do want to stress that I'm super impressed by what you've done here. I'd like to see KTor doing well. It looks very interesting indeed. Cheers!
Thanks David! I'll have to investigate options to avoid using VueJS, I've been trying to avoid ReactJS but maybe it's time for me to just suck it up and learn it 😅
how can i self host this?
You could use a service like DynDNS on a home server and then point your domain there.
I learned Ktor in about two days, and Javalin in just one day, and applied in projects immediately. Is not a steep learning curve.
Nice job.
7 days seems long. you can learn it in a day
hey can u please suggest me how and from where I can learn ktor framework for a beginner like me?