feat: add pallet-consensus-engine to support AURA to BABE migration

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "node",
     "pallets/midnight",
     "pallets/c2m-bridge",
+    "pallets/consensus-engine",
     "pallets/cnight-observation",
     "pallets/cnight-observation/mock",
     "pallets/midnight-system",
@@ -20,6 +21,7 @@ members = [
     "primitives/midnight",
     "primitives/ledger",
     "primitives/session-info",
+    "primitives/consensus-engine",
     "primitives/system-parameters",
     "res",
     "runtime",
@@ -122,6 +124,7 @@ pallet-cnight-observation-mock = { path = "pallets/cnight-observation/mock", def
 pallet-version = { path = "pallets/version", default-features = false }
 pallet-system-parameters = { path = "pallets/system-parameters", default-features = false }
 pallet-throttle = { path = "pallets/throttle", default-features = false }
+pallet-consensus-engine = { path = "pallets/consensus-engine", default-features = false }
 pallet-system-parameters-rpc = { path = "pallets/system-parameters/rpc", default-features = true }
 pallet-federated-authority = { path = "pallets/federated-authority", default-features = false }
 pallet-federated-authority-observation = { path = "pallets/federated-authority-observation", default-features = false }
@@ -136,6 +139,7 @@ midnight-primitives-cnight-observation = { path = "primitives/cnight-observation
 midnight-primitives-ics-observation = { path = "primitives/ics-observation", default-features = false }
 midnight-primitives-reserve-observation = { path = "primitives/reserve-observation", default-features = false }
 midnight-primitives-session-info = { path = "primitives/session-info", default-features = false }
+midnight-primitives-consensus-engine = { path = "primitives/consensus-engine", default-features = false }
 midnight-primitives-federated-authority-observation = { path = "primitives/federated-authority-observation", default-features = false }
 midnight-primitives-system-parameters = { path = "primitives/system-parameters", default-features = false }
 

changes/runtime/added/consensus-engine-pallet.md

@@ -0,0 +1,11 @@
+#runtime
+
+# Pallet Consensus Engine
+
+The pallet that will drive consensus engine change.
+State machine is implemented in the pallet.
+There is number of other tickets to complete the epic,
+therefore migration is not finished yet.
+
+Issue: https://github.com/midnightntwrk/midnight-node/issues/1740
+PR: https://github.com/midnightntwrk/midnight-node/pull/1892

local-environment/src/networks/local-env/configurations/readme.md

@@ -10,7 +10,7 @@ All are setup as validators and are expect to produce blocks. In other words the
   see [midnight-setup](../../../../../res/local/permissioned-candidates-config.json) related file,
   this node should fall back to its AURA keys, keys of this node match `//Bob` SURI
 - `midnight-node-3` does have BABE configured on Cardano (BABE equals AURA),
-  this node is using seeds files that are used to insert keys to keystore on the node startup,
+  this node is using seeds files (env variables `<key_type>_SEED_FILE` are used to set their paths) that are used to insert keys to keystore on the node startup,
   there is no BABE seed file (so it should fallback to AURA)
 - `midnight-node-4` does not have BABE configured on Cardano, but it has BABE key in the keystore (which equals AURA key)
 - `midnight-node-5` is a node that has both keys configured,

pallets/consensus-engine/Cargo.toml

@@ -0,0 +1,46 @@
+[package]
+name = "pallet-consensus-engine"
+version = "0.1.0"
+edition = "2024"
+description = "Pallet tracking the consensus-engine transition state machine"
+license-file.workspace = true
+publish = false
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+parity-scale-codec = { workspace = true, features = ["derive", "max-encoded-len"] }
+scale-info = { workspace = true, features = ["derive"] }
+frame-support.workspace = true
+frame-system.workspace = true
+log.workspace = true
+sp-consensus-aura.workspace = true
+sp-consensus-babe.workspace = true
+sp-consensus-slots.workspace = true
+midnight-primitives-consensus-engine.workspace = true
+
+[dev-dependencies]
+sp-core.workspace = true
+sp-io.workspace = true
+sp-runtime.workspace = true
+
+[features]
+default = ["std"]
+std = [
+    "parity-scale-codec/std",
+    "frame-support/std",
+    "frame-system/std",
+    "scale-info/std",
+    "sp-consensus-aura/std",
+    "sp-consensus-babe/std",
+    "sp-consensus-slots/std",
+    "midnight-primitives-consensus-engine/std",
+]
+try-runtime = [
+    "frame-support/try-runtime",
+    "frame-system/try-runtime",
+]
+
+[package.metadata.cargo-shear]
+ignored = ["scale-info"]