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DotnetYang by Westermo Network Technologies

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info

Name: DotnetYang

Package Description

Author: Westermo Network Technologies

NuGet: https://www.nuget.org/packages/DotnetYang/

You can find more details at https://github.com/westermo/DotnetYang

Source: https://github.com/westermo/DotnetYang

Original Readme​

note

Nuget (Generator) Build License

dotnetYang is a Roslyn source generator for using the .yang language to generate C# code, providing access to data models, ease-of-use asynchronous RPC, Action & Notification calls directly from code and generated server interfaces.

Features​

  • Drop-and-go: Add your .yang files to a C# project as additional files that references this generator, that is it, your .yang defined RPC's and more are now available directly in that C# projects code
  • Server-interface: Want to implement a server that responds to NETCONF calls? Look no further than the generated interface IYangServer and it's extension method async Task Recieve(this IYangServer server, Stream input, Stream output); which provides a framework for implementing your own server without having to worry about serializing and parsing NETCONF directly, but instead work with well defined C# Datatypes.

Documentation​

Getting Started​

In order to start using dotnetYang on a new .csproj project, start by adding the nuget packages by, for example, using the dotnet CLI in your project directory: dotnet add package dotnetYang

Afterwards, create or add a .yang file to said project: some-module.yang

module some-module {
    yang-version 1.1;
    namespace "urn:dotnet:yang:some:module";
    prefix sm;
    identity someIdentity;
    identity someOtherIdentity
    {
        base someIdentity;
    }
    rpc doSomething {
        input {
            leaf the-big-leaf
            {
                type uint32;
                default "4";
                description "The value that is the input of the doSomething rpc";
            }
        }
        output {
            leaf response
            {
                type identityref
                {
                    base someIdentity;
                }
                default "someOtherIdentity";
                description "The identity that is the output of the doSomething rpc";
            }
        }
    }
}

And then add it as an additional file to your .csproj file

<Project Sdk="Microsoft.NET.Sdk">
    <!--Other parts of the .csproj file -->
    <ItemGroup>
        <AdditionalFiles Include="some-module.yang" />
    </ItemGroup>
    <!--Other parts of the .csproj file -->
</Project>

Now the generated C# code from some-module.yang will be available, with it's naming conventions adjusted to be C# compliant

namespace MyProject;
public class Program
{
  public static async Task Main()
  {
      IChannel channel = //...Code for setting up whatever channel you want to send the rpc over
      int messageID = //...Code for getting message id;
      //Set up the rpc input, not the slight name changes
      Some.Module.YangNode.DoSomethingInput input = new Some.Module.YangNode.DoSomethingInput
      {
          TheBigLeaf = 123
      };
      //Call the rpc function, note the slight name changes and the asynchronous nature of the call
      Some.Module.YangNode.DoSomethingOutput output = await Some.Module.YangNode.DoSomething(channel, messageID, input);
      //Write the "response" leaf of the output to console.
      Console.WriteLine(output.Response);
  }
}

Server creation​

Say that you want to create a server that can response to calls defined in some-module.yang, then you would create a class that implementes the generated IYangServer interface, which might look something like this:

using Some.Module;
namespace MyProject;
public class Server : IYangServer
{
    public async Task<YangNode.DoSomethingOutput> OnDoSomething(YangNode.DoSomethingInput input)
    {
        //Do whatever it is the server is expected to do when told to "doSomething"...
        //Await something, do something else, the options are endless...
        
        //Create the output, not nessecarily like this..
        YangNode.DoSomethingOutput output = new YangNode.DoSomethingOutput(); 
        return output;
    }
}

Of course, if there are a lot of yang modules in a project, IYangServer runs the risk of becoming rather big. In such a case, it is recommended to split it's implementation into several partial server classes in order to maintain readability.

About​

note

Generating source code from YANG models

How to use​

Example (source csproj, source files)​

This is the CSharp Project that references DotnetYang

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  
  <ItemGroup>
    <AdditionalFiles Include="demo.yang" />
  </ItemGroup>

	 <PropertyGroup>
        <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
        <CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
    </PropertyGroup>	
  <ItemGroup>
    <PackageReference Include="dotnetYang" Version="0.3.0" />
  </ItemGroup>

</Project>

Generated Files​

Those are taken from $(BaseIntermediateOutputPath)\GX

using System;
using System.Xml;
using YangSupport;
namespace yangDemo;
///<summary>
///Configuration root object for yangDemo based on provided .yang modules
///</summary>

public class Configuration
{
    public Some.Module.YangNode? SomeModule { get; set; }
    public async Task WriteXMLAsync(XmlWriter writer)
	{
	    await writer.WriteStartElementAsync(null,"root",null);
	    
	    if(SomeModule is not null) await SomeModule.WriteXMLAsync(writer);
	    await writer.WriteEndElementAsync();
	}
    public static async Task<Configuration> ParseAsync(XmlReader reader)
	{
	    Some.Module.YangNode? _SomeModule = default!;
	    while(await reader.ReadAsync())
	    {
	       switch(reader.NodeType)
	       {
	           case XmlNodeType.Element:
	               switch(reader.Name)
	               {
	                    case "some-module":
						    _SomeModule = await Some.Module.YangNode.ParseAsync(reader);
						    continue;
	                    case "rpc-error": throw await RpcException.ParseAsync(reader);
	                    default: throw new Exception($"Unexpected element '{reader.Name}' under 'root'");
	               }
	           case XmlNodeType.EndElement when reader.Name == "root":
	               return new Configuration{
	                   SomeModule = _SomeModule,
	               };
	           case XmlNodeType.Whitespace: break;
	           default: throw new Exception($"Unexpected node type '{reader.NodeType}' : '{reader.Name}' under 'root'");
	       }
	    }
	    throw new Exception("Reached end-of-readability without ever returning from Configuration.ParseAsync");
	}
}
public static class IYangServerExtensions
{
   public static async Task Receive(this IYangServer server, global::System.IO.Stream input, global::System.IO.Stream output)
   {
       var initialPosition = output.Position;
       var initialLength = output.Length;
       string? id = null;
       using XmlReader reader = XmlReader.Create(input, SerializationHelper.GetStandardReaderSettings());
       using XmlWriter writer = XmlWriter.Create(output, SerializationHelper.GetStandardWriterSettings());
       try
       {
           await reader.ReadAsync();
           switch(reader.Name)
           {
               case "rpc":
                   id = reader.ParseMessageId();
                   await writer.WriteStartElementAsync(null, "rpc-reply", "urn:ietf:params:xml:ns:netconf:base:1.0");
                   await writer.WriteAttributeStringAsync(null, "message-id", null, id);
                   await reader.ReadAsync();
                   switch(reader.Name)
                   {
                       case "action":
                           await server.ReceiveAction(reader, writer);
                           break;
                       default:
                           await server.ReceiveRPC(reader, writer);
                           break;
                   }
                   await writer.WriteEndElementAsync();
                   await writer.FlushAsync();
                   break;
               case "notification":
                   var eventTime = await reader.ParseEventTime();
                   await reader.ReadAsync();
                   await server.ReceiveNotification(reader, eventTime);
                   break;
           }
       }
       catch(RpcException ex)
       {
           await writer.FlushAsync();
           output.Position = initialPosition;
           output.SetLength(initialLength);
           await ex.SerializeAsync(output,id);
       }
       catch(Exception ex)
       {
           await writer.FlushAsync();
           output.Position = initialPosition;
           output.SetLength(initialLength);
           await output.SerializeRegularExceptionAsync(ex,id);
       }
   }
   public static async Task ReceiveRPC(this IYangServer server, XmlReader reader, XmlWriter writer)
   {
       switch(reader.Name)
       {
           case "doSomething" when reader.NamespaceURI is "urn:dotnet:yang:andrei":
			{
			    var input = await Some.Module.YangNode.DoSomethingInput.ParseAsync(reader);
			    var task = server.OnDoSomething(input);
			    var response = await task;
			    await response.WriteXMLAsync(writer);
			}
			break;
       }
   }
   public static async Task ReceiveAction(this IYangServer server, XmlReader reader, XmlWriter writer)
   {
       await reader.ReadAsync();
       switch(reader.Name)
       {
           
       }
   }
   public static async Task ReceiveNotification(this IYangServer server, XmlReader reader, DateTime eventTime)
   {
       switch(reader.Name)
       {
           
           
       }
   }
}

Useful​

Download Example (.NET C# )​

tip

Download Example project DotnetYang

Share DotnetYang​

https://ignatandrei.github.io/RSCG_Examples/v2/docs/DotnetYang

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