Category: .NET Core

Debug Application under VSCode and Docker–part 22

What I wanted is that people that have only a container application ( docker) and VSCode ( not Visual Studio , nor .NET Core Framework) be able to debug the application and run it. That means, I no longer require to install .NET Core SDK on the local PC

Read a lot

https://code.visualstudio.com/docs/remote/containers#_devcontainerjson-reference

https://github.com/microsoft/vscode-dev-containers/tree/master/containers/dotnetcore-3.0

https://code.visualstudio.com/docs/remote/containers

Some important things :

in the devcontainer.json put “shutdownAction”: “stopContainer”
Delete continuously the vscode image if something wrong

docker container prune -f

docker images “vs*”

docker image rm <id of the prev image>

Now I have all in place ( see commit https://github.com/ignatandrei/InfoValutar/commit/474698d33e20e1aa6fc9e2fd6f4c42ea73e50b03 )

A .devContainer folder with a DockerFile and devcontainer.json ( to construct the docker container)

A .vscode folder with launch.json , devcontainer.json, settings.json – to run F5 into the container

All I need is to Launch VSCode, press Remote-Container : Open Folder in Container, goto Infovalutar folder that has the .sln. Then press F5 in VS Code and voila!

Now, anywhere I go, I can launch VSCode and debug the application.

Infovalutar

And one hour passes...
(This is the result of 1 hour per day auto-challenge as a full cycle developer for an exchange rates application)
( You can see the sources at https://github.com/ignatandrei/InfoValutar/ )

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Making visible the application -part 21

Trying to make visible the docker with https://labs.play-with-docker.com/?stack=https://raw.githubusercontent.com/ignatandrei/InfoValutar/master/PlayWithDocker/WebAPI.yml

leaving an issue: https://github.com/play-with-docker/play-with-docker/issues/370

Decided to add to the readme the docker . Going to Shields.io . Putting some lines for beginners with docker.

Reading more about port –binding . Figuring this is is:

ENV ASPNETCORE_URLS=http://*:8080
#ENV ASPNETCORE_URLS=http://0.0.0.0:8080

And that was all !

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Docker–fourth part–part 20

Time to push to docker

1. putting the docker password into the pipeline variables

2. Modifying the yaml

3. Waiting for build

Error in Docker: Incorrect name or password

Now, I want to create 2 jobs to isolate Docker from the main build.

I encounter some errors in the yaml file . That shows fast in the AzureDevops, but you must figure what it is by reading the line

/azure-pipelines.yml: (Line: 8, Col: 7, Idx: 271) – (Line: 8, Col: 7, Idx: 271): Mapping values are not allowed in this context.

/azure-pipelines.yml: (Line: 45, Col: 3, Idx: 1225) – (Line: 45, Col: 4, Idx: 1226): While parsing a block mapping, did not find expected key.

Job Build Docker has an invalid name. Valid names may only contain alphanumeric characters and ‘_’ and may not start with a number.

(a name attribte was not indented, steps was not found before script, build name having spaces)

Now trying to build again. Error because I have put the password variable from Azure secret? Delete the variable, putting another variable with the same name, not secret. Works!

Now I have on docker hub a new image, ignatandrei/infovalutar : https://hub.docker.com/r/ignatandrei/infovalutar

You can run with

docker run –rm -it -p 8080:8080 ignatandrei/infovalutar:latest

And then go to http://localhost:8080/swagger/

And that was all! ( pipeline definition at https://dev.azure.com/ignatandrei0674/InfoValutar/_build?definitionId=5&_a=summary )

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Docker–third part–part 19

Trying different codes in the csproj to add dynamically content from a folder ( including the dll’s copied there ) and to retrieve in the output directory: ( reading from internet of all those stuff)

Version 1:

<!–<Target Name=”ContentsBeforeBuild” AfterTargets=”BeforeBuild”>
<ItemGroup>
<Content Include=”plugins\**” />
</ItemGroup>
</Target>—>

Version 2:

<!–<Content Update=”plugins\**\*.dll” CopyToOutputDirectory=”Always” LinkBase=”plugins”>

</Content>—>

Version 3:
<!–<Content Update=”$([System.IO.Directory]::GetFiles(‘$(ProjectDir)plugins’, ‘*.*’, SearchOption.AllDirectories))” CopyToOutputDirectory=”PreserveNewest”>–>

<!–</Content>—>

Version 4: – works!

Now, I want to make this docker each time that I modify and show to the end users to test it.

However, this should be not in the same process as running the tests – the tests should be very fast in order to see problems – the making of release software could take minutes.

Going to https://dev.azure.com/ignatandrei0674/ and making a new project to deal with this.Creating new project, integrating with GitHub – seamless integration with .NET Core – even created a azure-pipelines.yml for me.

Extra bonus: GitHub actions runs on Ubuntu. I will put Azure to run on Windows. This way, I know that the build of the project works either way

Now, a different error in docker:

Access to the path ‘C:\app\InfoValutar\InfoValutarDOS\obj\InfoValutarDOS.csproj.nuget.dgspec.json’ is denied.

Oh, forgot to put a .dockerignore . First I put where the docker file was –big mistake. Should be put where the folder to be included is!

Now ,a different error in docker

Access to the path ‘C:\app\InfoValutar\InfoValutarWebAPI\InfoValutarWebAPI.xml’ is denied.

Oh, give me a break! Delete the .xml and add later to .gitignore and .dockerignore ( as full path, I do not want to ignore ALL xml files)

I works now!!!!

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Docker–second part–part 18

Now , I must replace all with powershell files. Some problem – if I build twice, it says : resource already exists. So I need to add

–Force

parameter.

Now pushing to GitHub https://github.com/ignatandrei/InfoValutar/commit/2c487963da53f04f94a0a7b060999f8e27635179

and see if it works. No, error on .sln build.

ObjectNotFound: (/home/runner/work/I\u2026nfoValutar/plugins”

Apparently, it is a Unicode character ?

Try to save as ASCII file. Waiting for GitHub action to do it’s magic.

Same Error – now putting some messages with echo to see what is there

echo “args 0 ” $args[0]
echo “args 1 ” $args[1]
$a= Get-Location
echo $a
echo now copy

Now waiting for GitHub actions to display – it does NOT show the console from powershell, just the error!

Putting in After Build to copy the plugins.

Same error. Looking very, very attentive to the command , I see now. Can you see ?

pwsh $(ProjectDir)preBuild.ps1 “”$(RepoRoot)plugins\” “$(TargetDir)”

Apparently, pwsh from Windows is more forgetful than the Linux one… ( or it is not the same ? Maybe because I have powershell on my PC ?)

Now ( after deleting double double quotes) shows also the powershell messages!

Now I can make docker!

And the first problem arises. When building the .sln , it copies to the output folder the plugins. But not when publish the csproj.

Try with –no-build when publish and adding

<RuntimeIdentifiers>win10-x64;linux-x64</RuntimeIdentifiers>

to the .csproj

Now, dotnet publish does not copy the plugins – I should copy by hand ?

So – figure that I do not copy to the final output – but direct to the project.

1. I should copy there in the build event of the project – modify the arguments to have copy in the plugins folder

2. I should include in the .csproj any new plugins:

<Content Include=”plugins\**”>
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</Content>

Error duplicate items – found it was

<Content Update=”plugins\**” CopyToOutputDirectory=”PreserveNewest”>

3. Do not include in GitHub – already done – plugins folder is not included

Now trying to execute in swagger to give list of plugins / banks => internal server error

Trying to publish without single file => give empty list /banks. Let’s see -but next time

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Docker–first part–part 17

Trying to put the web into docker. In order to have easy builds for the developer , we copy the sln, then the csproj , then dotnet restore, then copy files. This way we get advantage of Docker caching.

Created dockerForWebAPI.txt

and run

docker build -f dockerForWebAPI.txt -t infovalutar ..

Docker has not recursive copy – https://github.com/moby/moby/issues/15858

Solution: copy the .csproj one by one. ( other solution: .tar file and copy the .csproj into tar, then use ADD command)

So copy the .sln with

COPY InfoValutar/*.sln ./

Then trying to copy files

Version 1

COPY InfoValutar/InfoValutarDOS/InfoValutarDOS.csproj ./

( not good, same dir)

Version 2

COPY InfoValutar/InfoValutarDOS/InfoValutarDOS.csproj ./app/InfoValutarDOS/InfoValutarDOS.csproj

(not good , discovered that creates another app folder – thanks for the docker run –rm -it infovalutar:latest /bin/bash )

Version 3

COPY InfoValutar/InfoValutarDOS/InfoValutarDOS.csproj ./InfoValutarDOS/InfoValutarDOS.csproj

Good. Now copy files and build solution

And now it is the moment when echo and xcopy for plugins will bite me – no xcopy on linux….

The only thing that I know to work in WIndows and Linux is … Powershell.

Any .NET Core 3 has this – run pwsh. It remains to install to my directory – see https://andrewlock.net/new-in-net-core-3-local-tools/

The version of powershell on my PC differs from the version on Windows Container from GitHub actions. Switch to Ubuntu.

Again – does not work . Try with pwsh –Command.

It does work on GitHub actions but NOT on my PC ( does not recognize command. ) . Thinking different pwsh version.

But on thing is the same – running file.

Create a powershell file

Copy-Item -Path $args[0] -Destination $args[1] –Recurse

and running this file with

pwsh $(ProjectDir)pb.ps1 “$(TargetDir)” “$(SolutionDir)plugins\$(ProjectName)”

( Do not forget to run first

dotnet tool restore

in the solution folder!)

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Swagger/OpenAPI –part 16

In order to see the WebAPI, Swagger is a default technology. Reading https://docs.microsoft.com/en-us/aspnet/core/tutorials/web-api-help-pages-using-swagger?view=aspnetcore-3.0 , seems to have 2 options: Swashbuckle and NSwag. Looking at github repositories, both have > 2k stars, active development, tutorials. The only thing that I see more at NSwag are generators for Angular.

Integrated NSwag as for the tutorial from https://docs.microsoft.com/en-us/aspnet/core/tutorials/getting-started-with-nswag?view=aspnetcore-3.0&tabs=visual-studio . There is a small problem – when I try the swagger , I should put explicit the version. However, a not experienced user can not see this value.

Trying to put documentation : when I go to Project=>Properties=>Build and click the XML documentation, shows the full path to the XML. I do not need this! So I edit the .csproj directly and change from full path to file

Also, because I want to be sure to have documentation, I change “warnings to errors”.

So now I must document Program and main(removed public from startup.cs and createwebhost – to not document)

Total: 6 changes , https://github.com/ignatandrei/InfoValutar/commit/4fbff903c4510acbcb219d0263ae89736e9f2d8d

So now I can browse to swagger

However, I should indicate to people that swagger is enabled to invite them browse to this – and this is easy to do in Kestrel, right ? Just take the address of the url …

So, trying in Program.cs to find the adresses:

var build = CreateHostBuilder(args).Build();
var s = build.Services.GetService(typeof(KestrelServerOptions));
var s1 = build.Services.GetService(typeof(IServer));
var s2 = build.Services.GetService(typeof(IServerAddressesFeature));
build.Run();

Not a chance – not yet configured. So , next chance is in Startup.cs

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
//other code
var sa = app.ServerFeatures.Get<IServerAddressesFeature>();
var urls =string.Join(",", sa.Addresses.Select(it => it + "swagger"));
Console.WriteLine("please use " + urls);

( for this, you must not use IIS Express, but rather the project)

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Repairing the build and versioning–part 15

Now , after copy the plugins, the build is not working.

Thnking about the build events, I realize that to find same copy command on Linux and Windows is difficult – so Windows it is.

( and, BTW , In LInux the macro $(SolutionDir ) does not work use repoRoot

https://docs.microsoft.com/en-us/visualstudio/msbuild/customize-your-build?view=vs-2019

https://github.com/Microsoft/msbuild/issues/2397

)

Switch windows-latest on https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#jobsjob_idruns-on

Now tests are failing – repairing the tests.

I realize that I cannot build just the csproj – the solution sln knows the order in which to build the projects- but the .csproj does not. So now building the sln and then publish

Now giving error in Github, but not on local. More, there was a not repeatable . I figured was because of the parallel builds so this is the final line

dotnet build –configuration Release InfoValutar/InfoValutar.sln /m:1

Now it works!

The only programming thing that I have done is to add versioning , https://github.com/microsoft/aspnet-api-versioning/wiki/How-to-Version-Your-Service . I do tend to say that the URL is a Unique Identifier – so I want the versioning be part of the URL.

As advised by https://github.com/microsoft/aspnet-api-versioning/wiki/Versioning-via-the-URL-Path

I added the pacakage Microsoft.AspNetCore.Mvc.Versioning and

services.AddApiVersioning();

and on the controller

[ApiVersion( “1.0” )]

[Route(“api/v{version:apiVersion}/[controller]/[action]”)]

and now I can access

api/v1.0/TodayRates/banks

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Plugin copy and caching- part 14

I have had 2 problems to solve

How to put the plugins for the console and web api ?
How to cache the data ? ( plugins / exchange rates)

The solution for the first problem should be easy for the programmer PC, and for the deploying the application ( console/ web api/ etc )There are several solutions :

Each plugin knows where to copy the dll ( console/web api)
The application ( console / webapi) knows a special place from which to copy the plugin definition

I tend to agree with both – but mostly with the second. So … the idea is as follows:

The plugin builds and copy the output to a special folder, named “plugins” ( what a surprise, righyt?)

The console /webapi copies the folder plugins under his directory

The only problem here is that we should ensure that plugins are build first, even if the application does NOT have reference to them.

For this, there is a special menu in VS for solution, namely “build order” – you go to this –and after to the second tab, project dependencies. For the console and web I select as dependency the two loading projects – InfoValutarNBR and InfoValutarECB. The changes are reflected into the sln file

I could have done this on just the InfoValutarLoadingLibs project – but maybe I can have another way to load the libraries ( not so much for the moment )

So now I begin to modify what happens

after build events for InfoValutarNBR and InfoValutarECB

xcopy “$(TargetDir)*.*” “$(SolutionDir)plugins\$(ProjectName)” /E /F /I /Y /R

and pre build events for InfoValutarDOS and InfoValutarWebAPI.

Now, there are several things to do:

Add to .gitignore the plugins folder to not put into the source control( ok)
Write some documentation about the process
Think about linux/docker compiling – there is a xcopy there ?

About the documentation – I just did. More, I create a InfoValutarPluginStarter , in order for others to copy this project and make a new plugin.

Realized also that the WebAPI could be simpler

[HttpGet(“{bank}”)]
public IAsyncEnumerable<ExchangeRates> Rates([FromRoute] string bank)

And also that I should throw another exception if Bank is null or empty:

if(string.IsNullOrWhiteSpace(bank))
throw new ArgumentNullException($”{nameof(bank)} cannot be empty”);

For docker compiling – next time

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Creating the WebAPI–part 13

I am now tired of continuously improving the console application – so now some work that others can see really. Creating the WebAPI is simple as a project – and I was amazed to see a WeatherForecast controller.

I need just to be able to see the today exchange rates via API . So created a TodayRates , modify the launchSettings.json in order to start with my controller.

I need the plugin that loads to be a global dependency. So I add as a Singletion in the services

services.AddSingleton< LoadExchangeProviders>(new LoadExchangeProviders(“plugins”));

and then I inject into the controller constructor ( I can do in the method also, but many methods needs the same dependency )

public TodayRates(ILogger<TodayRates> logger, LoadExchangeProviders prov)
{
_logger = logger;
_prov = prov;
}

Now I need a method to see what are the banks / plugins that are loaded . Linq to the rescue :

[HttpGet]
public IEnumerable<string> Banks()
{
return _prov
.LoadExchange()
.Select(it=>it.Bank)
.ToArray();
}

Now we should load the data from the provider to show actual rates

public async IAsyncEnumerable<ExchangeRates> Rates(string bank)
{
var provBank = _prov
.LoadExchange()
.FirstOrDefault(it => string.Equals(bank, it.Bank, StringComparison.InvariantCultureIgnoreCase));

switch (provBank)
{
case null:
yield return null;
break;
default:
{
await foreach (var data in provBank.GetActualRates())
{
yield return data;
}

break;
}
}

}

All good. There are 3 problems:

How to put the plugins for the console and web api ?
How to cache the data ? ( plugins / exchange rates)
Should we throw an exception when a bank does not exists, instead of returning null ?

Thinking of this code, I realized that I begin to put logic into controllers. So – let’s move from the controller to the business.

For example, now I have this:

[HttpGet]
public IEnumerable<string> Banks()
{
return _prov.Banks();
}

And this

[HttpGet]
public IAsyncEnumerable<ExchangeRates> Rates(string bank)
{
return _prov.Rates(bank);
}

So now I can change in the Business Layer without problems.

Looking at the Console Application vs WebAPI, I realized that are different. The console is loading the whole data from the providers – the WebAPI is loading on demand. We could do for the console the same behavior – but the console is loading very fast all data.

For the answer at

Should we throw an exception when a bank does not exists, instead of returning null ?

– seems to be yes.

So instead of

case null:
yield return null;
I put

case null:
throw new ArgumentOutOfRangeException(nameof(bank),$”cannot find {bank}”);

For the 2 questions, the answer next time.

Infovalutar

Nr	Post
1	Start
2	Reading NBR from internet
3	Source control and build
4	Badge and test
5	CI and action
6	Artifacts and dotnet try
7	Docker with .NET Try
8	ECB
9	Intermezzo - Various implementations for programmers
10	Intermezzo - similar code - options
11	Plugin implementation
12	GUI for console
13	WebAPI
14	Plugin in .NET Core 3
15	Build and Versioning
16	Add swagger
17	Docker - first part
18	Docker - second part
19	Docker - build Azure
20	Pipeline send to Docker Hub
21	Play with Docker - online
22	Run VSCode and Docker
23	Deploy Azure
24	VSCode see tests and powershell
25	Code Coverage
26	Database in Azure
27	Sql In Memory or Azure
28	Azure ConString, RSS
29	Middleware for backward compatibility
30	Identical Tables in EFCore
31	Multiple Data in EFCore
32	Dot net try again
33	Start Azure Function
34	Azure function - deploy
35	Solving my problems
36	IAsyncEnumerable transformed to IEnumerable and making Azure Functions works
37	Azure functions - final
38	Review of 37 hours
39	Last Commit in AzureDevOps
40	Create Angular WebSite
41	Add static Angular to WebAPI .NET Core
42	Docker for Angular
43	Angular and CORS
44	SSL , VSCode, Docker
45	Routing in Angular
46	RxJS for Routing
47	RxJs Unsubscribe

Category: .NET Core

Infovalutar

Infovalutar

Infovalutar

Infovalutar

Infovalutar

Infovalutar

Infovalutar

Infovalutar

Infovalutar

Infovalutar

Andrei Ignat weekly software news(mostly .NET)