[REQ] New ASP.NET Core 3.0 server generator

[wing328]

To start with, we'll need to create the following:

• new AspNetCore3ServerCodegen.java based on AspNetCoreServerCodegen.java
• new resource folder modules/openapi-generator/src/main/resources/aspnetcore3 based on modules/openapi-generator/src/main/resources/aspnetcore (2.0 or 2.1)
• add batch file to generate Petstore samples under samples/server/petstore/aspnetcore3

cc @SeanFarrow

[SeanFarrow]

Let me get a vm with .net core 3 on sorted in the next few days. I’ll then take a look at this, so if you could assign it to me that would be appreciated. From: William Cheng <notifications@github.com> Sent: 10 March 2019 14:34 To: OpenAPITools/openapi-generator <openapi-generator@noreply.github.com> Cc: Sean Farrow <sean.farrow@seanfarrow.co.uk>; Mention <mention@noreply.github.com> Subject: [OpenAPITools/openapi-generator] [REQ] New ASP.NET Core 3.0 server generator (#2350) To start with, we'll need to create the following: * new AspNetCore3ServerCodegen.java based on AspNetCoreServerCodegen.java * new resource folder modules/openapi-generator/src/main/resources/aspnetcore3 based on modules/openapi-generator/src/main/resources/aspnetcore (2.0 or 2.1) * add batch file to generate Petstore samples under samples/server/petstore/aspnetcore3 cc @SeanFarrow<https://github.com/SeanFarrow> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#2350>, or mute the thread<https://github.com/notifications/unsubscribe-auth/ABY1fsF1o-ouEvRUvDyVjGXa3edUjwmEks5vVRfzgaJpZM4bnS5r>.

[A-Joshi]

@SeanFarrow
Have been slowly adding in library and other support for the aspnetcore generator particularly for 2.2 and happy to collaborate for 3.0.

[etherealjoy]

I am interested in ASP.NET Core 3.0 and I have lots of manual things that I do with the 2.1 generator and I would really like a clean sheet .NET Core 3 including clients and

Some features I would be interested/suggesting

• DI mechanism to leave generated code untouched
• Microsoft's json parser instead of json.NET

[A-Joshi]

Sure - no objections about that - just curious what do you have to do manually? Moving to 3.0 would be a good idea - though I suspect it will take a little time after it is releaseed before one can move to it.

…

On 3/20/19 3:37 PM, sunn wrote: I am interested in ASP.NET Core 3.0 and I have lots of manual things that I do with the 2.1 generator and I would really like a clean sheet .NET Core 3 including clients and using Microsoft's new high performance json parser — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2350 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ANQEIem0GkY_q_XMpU4JfwqewR3pwgAQks5vYo3ugaJpZM4bnS5r>.

[wing328]

Discussions related to authentication support: #2352

[etherealjoy]

Which generator should we base this from , current asp.net core?

[A-Joshi]

Based on what I seen so far Migrate from ASP.NET Core 2.2 to 3.0 Preview 2 it might not be that difficult to simply extend the current current generator for one more version.

Particularly for the library and other classes. There's more in common than different, and there are some features that I am looking at for the current generator (e.g. Roslyn) that would be simpler to add in one place.

@etherealjoy - can you summarize the manual changes that you have to do to go from 2.1 to 3.0?

[etherealjoy]

I did these

• update TFM
• Change The Configure services
• Add Json.NET manually
• Adapt Configure services and Configure due to change in hosting environment and Json.NET
• Update package versions
• Add nuget config

Additionally I was wondering if we use Json.NET or use MS internal Json package
Nice to have would be the DI mechanism to inject the API handlers instead of manually editing the HomeController. This is tedious everytime we generate code due to API update.
What I usually do is keep the Handler is another project and import them in Home controller

[A-Joshi]

@etherealjoy it might be simpler to adopt the approach of using the generator to generate an abstract class and have the server implement it. I am waiting for #2629 to be merged and will be able to provide more concrete examples.

[etherealjoy]

Additionally using current aspnetcore generator I had to rearrange the layout of the folders and update the base images to point to mcr

[A-Joshi]

@etherealjoy might be helpful if you can create a simple example with the generated original code and the modified to work with 3.0 code.

[SeanFarrow]

I'm now starting to look at Asp.Net core 3.0 and I would not recommend just upgrading the current generator as is as things like routing have changed. Also, for backwarrd compatibility, we will need to support Json.Net which has been removed in 3.0, but is still opt-in.

I'm currently working on the Asp.net Core 2.x authorization/authentication support to ensure we support all security schemes in OAS v3, but can then look at this in more detail.

Finally, asp.net core is still in preview, so to my thinking there really isn't any rush.

[etherealjoy]

The most important thing for me why I am working with .NET Core 3.0 already is official support for Linux arm64.
Upcoming feature in .NET Core 3.0, single file bundle makes it easier for deployment and deploying in Linux containers is a breeze. Pretty much like Go

But lets wait for MS Build and see

I believe the ASP.NET Core 3.0 would be better off being a new generator.
Regarding JSON.NET I think we can discuss if we start using MS JSON Parser instead or continue with it.