Support nimbus session keys

[RomarQ]

Is your feature request related to a problem? Please describe.

Related issue: #789

Currently I am facing the same problem described in the issue linked above, unfortunately the issue was closed without describing a solution.

I've integrated nimbus framework into a parachain, where session keys now contain a nimbus field to identify the nimbus consensus keys. The issue is that zombienet replaces the genesis session keys configuration with some zombienet specific structure where a nimbus key is not provided.

Is there any easy way to fix this issue, without passing the chain_spec directly or adding nimbus field to this struct (orchestrator/src/chainSpec.ts)?

Describe the solution you'd like

Reuse nimbus field (or any fields unknown by zombienet) when overriding the session.key config.

Original spec:

"session": {
        "keys": [
          [
            "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
            "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
            {
              "nimbus": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY"
            }
          ]
        ]
      },

After zombienet overrides:

"session": {
        "keys": [
          [
            "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
            "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
            {
              "grandpa": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "babe": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "im_online": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "parachain_validator": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "authority_discovery": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "para_validator": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "para_assignment": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "beefy": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "aura": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
              "nimbus": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY"
            }
          ]
        ]
      },

Describe alternatives you've considered

Adding nimbus field here: (orchestrator/src/chainSpec.ts)

Additional context

No response

[pepoviola]

Hi @RomarQ, does nimbus use the same key scheme sr25519? And also should be only added for collators. In general we use the parachains registry to override this behavior, but I think we can add nimbus since could be multiple parachains that want to use it.
Thanks!!

[RomarQ]

Hi @pepoviola,

Yes, it uses the same key scheme. Here is the PR with the fix: #1063