Inability to use Serverless template variables

[zaus]

Description

Expected to be able to use Serverless Framework self variables throughout the template .yml. Instead tool fails with GUI reporting:

FileLoadException: The given assembly name or codebase was invalid. (0x80131047)

Reproduction Steps

1. aws-lambda-tools.default.json indicates template serverless.yml
2. serverless.yml looks like with variable ${self:service} where service name matches project/folder name

   service: My.Namespace.And.Solution.Project
   
   provider:
     name: aws
     runtime: dotnetcore3.1
   
   package:
     individually: true
   
   functions:
     hello:
       handler: ${self:service}::${self:service}.Handler::HelloWorld
           ...

3. launch.json in VSCode calls "program": "/Users/${env:USERNAME}/.dotnet/tools/dotnet-lambda-test-tool-3.1"
4. Run debugging tool, GUI opens in browser with "Stack" tab showing error and trace
5. Replace all instances of variable in serverless.yml template with explicit service name
6. Run debugging tool, GUI opens in browser with working mock testing tool

Logs

?

Environment

• Build Version: dotnet-lambda-test-tool-3.1 v0.10.0, dotnet-lambda v5.2.0
• OS Info: Windows 10 Pro
• Build Environment: VSCode + dotnet
• Targeted .NET Platform: Core 3.1

Resolution

Maybe the pre-parsing/transpiling is a feature that hasn't been implemented yet? Or is this specific to Serverless runtimes?

---

This is a 🐛 bug-report

[zaus]

Followup -- tried creating a custom variable section instead of the service name, but it doesn't work either:

service: My-Shorter-Namespace-Without-Periods

custom:
  dotnetProj: My.Project.That.Has.Periods

provider:
  name: aws
  runtime: dotnetcore3.1

package:
  individually: true

functions:
  hello:
    handler: ${self:custom.dotnetProj}::${self:custom.dotnetProj}.Handler::HelloWorld

    package:
      artifact: bin/release/netcoreapp3.1/${self:custom.dotnetProj}.zip

[ashishdhingra]

@zaus We had discussion with the team. We do not have first class support for serverless framework, but any PR(s) are welcome. Changing this to feature request. Feel free to contribute in the form of PR.