feat: Add Infrahub Jinja2 transforms for MLAG configuration (#22) (#26)
## Summary
Closes #22. Implements Infrahub Jinja2 transforms for MLAG configuration, generating Arista-native YANG-compatible JSON payloads from Infrahub intent data.
| File | Description |
|------|-------------|
| `infrahub/transforms/queries/mlag_intent.gql` | GraphQL query — fetches `InfraMlagPeerConfig` by `$device_name`, including MLAG domain attributes, peer/iBGP VLANs, local interface SVI, and peer-link LAG |
| `infrahub/transforms/templates/mlag_yang.j2` | Jinja2 template — renders a JSON object targeting `/arista-mlag-augments:mlag/config`; returns `[]` for devices with no MLAG (spines) |
| `infrahub/transforms/tests/mlag_yang/test.yml` | Test spec: smoke check + unit render tests for `leaf1` and `spine1` |
| `infrahub/transforms/tests/mlag_yang/leaf1/` | Mock input + expected output for leaf1 (full MLAG config, domain `leafs-1-2`) |
| `infrahub/transforms/tests/mlag_yang/spine1/` | Mock input (empty edges) + expected output `[]` for spine1 |
| `.infrahub.yml` | Registers `mlag_intent` query and `mlag_yang_transform` jinja2 transform |
## Output shape (leaf1)
```json
{
"mlag": {
"config": {
"domain-id": "leafs-1-2",
"peer-link": "Port-Channel999",
"local-interface": "Vlan4090",
"peer-address": "10.0.199.255",
"shutdown": false
},
"dual_primary_detection": {
"enabled": true,
"delay": 10,
"action": "errdisable",
"heartbeat_peer_ip": "172.16.0.50",
"heartbeat_vrf": "mgmt"
},
"virtual_mac": "c001.cafe.babe",
"peer_vlan_id": 4090,
"ibgp_vlan_id": 4091,
"local_interface_ip": "10.0.199.254/31"
}
}
```
## Validation
```bash
infrahubctl render mlag_yang_transform device_name=leaf1 # → MLAG config JSON
infrahubctl render mlag_yang_transform device_name=spine1 # → []
```
## Design notes
- Follows identical conventions to existing transforms (#20 VLAN/interface/VXLAN, #21 VRF/L3VNI)
- All optional relationship accesses wrapped in `is defined and is not none` guards
- Spine/non-MLAG devices return `[]` (empty array) — consistent with the "no data → empty collection" pattern used in vxlan_yang for devices without VTEP
Damien Arnodo
cf7da535ed