chore(inactivity): Rename inactive flag to sluggish, add queries, events, and metrics

proto/babylon/btcstaking/v1/btcstaking.proto

@@ -33,8 +33,8 @@ message FinalityProvider {
     // the finality provider is slashed.
     // if it's 0 then the finality provider is not slashed
     uint64 slashed_btc_height = 7;
-    // inactive defines whether the finality provider is detected inactive
-    bool inactive = 8;
+    // sluggish defines whether the finality provider is detected sluggish
+    bool sluggish = 8;
 }
 
 // FinalityProviderWithMeta wraps the FinalityProvider with metadata.
@@ -54,8 +54,8 @@ message FinalityProviderWithMeta {
     // the finality provider is slashed.
     // if it's 0 then the finality provider is not slashed
     uint64 slashed_btc_height = 5;
-    // inactive defines whether the finality provider is detected inactive
-    bool inactive = 6;
+    // sluggish defines whether the finality provider is detected sluggish
+    bool sluggish = 6;
 }
 
 // BTCDelegation defines a BTC delegation

proto/babylon/btcstaking/v1/query.proto

@@ -349,6 +349,6 @@ message FinalityProviderResponse {
   uint64 height = 8;
   // voting_power is the voting power of this finality provider at the given height
   uint64 voting_power = 9;
-  // inactive defines whether the finality provider is detected inactive
-  bool inactive = 10;
+  // sluggish defines whether the finality provider is detected sluggish
+  bool sluggish = 10;
 }

proto/babylon/finality/v1/events.proto

@@ -11,3 +11,17 @@ message EventSlashedFinalityProvider {
     // evidence is the evidence that the finality provider double signs
     Evidence evidence = 1;
 }
+
+// EventSluggishFinalityProviderDetected is the event emitted when a finality provider is
+// detected as sluggish
+message EventSluggishFinalityProviderDetected {
+    // public_key is the BTC public key of the finality provider
+    string public_key = 1;
+}
+
+// EventSluggishFinalityProviderReverted is the event emitted when a sluggish finality
+// provider is no longer considered sluggish
+message EventSluggishFinalityProviderReverted {
+    // public_key is the BTC public key of the finality provider
+    string public_key = 1;
+}

proto/babylon/finality/v1/params.proto

@@ -16,7 +16,7 @@ message Params {
   // vote before being judged as missing their voting turn on the given block
   int64 finality_sig_timeout = 2;
   // min_signed_per_window defines the minimum number of blocks that a finality provider is required to sign
-  // within the sliding window to avoid being detected as inactive
+  // within the sliding window to avoid being detected as sluggish
   bytes min_signed_per_window = 3 [
     (cosmos_proto.scalar)  = "cosmos.Dec",
     (gogoproto.customtype) = "cosmossdk.io/math.LegacyDec",

proto/babylon/finality/v1/query.proto

@@ -54,6 +54,16 @@ service Query {
   rpc ListEvidences(QueryListEvidencesRequest) returns (QueryListEvidencesResponse) {
     option (google.api.http).get = "/babylon/finality/v1/evidences";
   }
+
+  // SigningInfo queries the signing info of given finality provider BTC public key
+  rpc SigningInfo(QuerySigningInfoRequest) returns (QuerySigningInfoResponse) {
+    option (google.api.http).get = "/babylon/finality/v1/signing_infos/{fp_btc_pk_hex}";
+  }
+
+  // SigningInfos queries the signing info of all the active finality providers
+  rpc SigningInfos(QuerySigningInfosRequest) returns (QuerySigningInfosResponse) {
+    option (google.api.http).get = "/babylon/finality/v1/signing_infos";
+  }
 }
 
 // QueryParamsRequest is request type for the Query/Params RPC method.
@@ -208,3 +218,32 @@ message QueryListEvidencesResponse {
   // pagination defines the pagination in the response.
   cosmos.base.query.v1beta1.PageResponse pagination = 2;
 }
+
+// QuerySigningInfoRequest is the request type for the Query/SigningInfo RPC
+// method
+message QuerySigningInfoRequest {
+  // fp_btc_pk_hex is the hex str of Bitcoin secp256k1 PK
+  // (in BIP340 format) of the finality provider
+  string fp_btc_pk_hex = 1;
+}
+
+// QuerySigningInfoResponse is the response type for the Query/SigningInfo RPC
+// method
+message QuerySigningInfoResponse {
+  // fp_signing_info is the signing info of requested finality provider BTC public key
+  FinalityProviderSigningInfo fp_signing_info = 1 [(gogoproto.nullable) = false];
+}
+
+// QuerySigningInfosRequest is the request type for the Query/SigningInfos RPC
+// method
+message QuerySigningInfosRequest {
+  cosmos.base.query.v1beta1.PageRequest pagination = 1;
+}
+
+// QuerySigningInfosResponse is the response type for the Query/SigningInfos RPC
+// method
+message QuerySigningInfosResponse {
+  // info is the signing info of all finality providers with signing info
+  repeated FinalityProviderSigningInfo fp_signing_infos = 1 [(gogoproto.nullable) = false];
+  cosmos.base.query.v1beta1.PageResponse pagination = 2;
+}

x/btcstaking/keeper/finality_providers.go

@@ -67,22 +67,22 @@ func (k Keeper) SlashFinalityProvider(ctx context.Context, fpBTCPK []byte) error
 	return nil
 }
 
-// RevertInactiveFinalityProvider sets the Inactive flag of the given finality provider
+// RevertSluggishFinalityProvider sets the Sluggish flag of the given finality provider
 // to false
-func (k Keeper) RevertInactiveFinalityProvider(ctx context.Context, fpBTCPK []byte) error {
+func (k Keeper) RevertSluggishFinalityProvider(ctx context.Context, fpBTCPK []byte) error {
 	// ensure finality provider exists
 	fp, err := k.GetFinalityProvider(ctx, fpBTCPK)
 	if err != nil {
 		return err
 	}
 
 	// ignore the finality provider is already slashed
-	// or detected as inactive
-	if fp.IsSlashed() || fp.IsInactive() {
+	// or detected as sluggish
+	if fp.IsSlashed() || fp.IsSluggish() {
 		return nil
 	}
 
-	fp.Inactive = false
+	fp.Sluggish = false
 	k.SetFinalityProvider(ctx, fp)
 
 	return nil

x/btcstaking/keeper/hooks.go

@@ -20,18 +20,18 @@ func (k Keeper) Hooks() Hooks {
 	return Hooks{k}
 }
 
-// AfterInactiveFinalityProviderDetected updates the status of the given finality provider to `inactive`
-func (h Hooks) AfterInactiveFinalityProviderDetected(ctx context.Context, fpPk *bbntypes.BIP340PubKey) error {
+// AfterSluggishFinalityProviderDetected updates the status of the given finality provider to `sluggish`
+func (h Hooks) AfterSluggishFinalityProviderDetected(ctx context.Context, fpPk *bbntypes.BIP340PubKey) error {
 	fp, err := h.k.GetFinalityProvider(ctx, fpPk.MustMarshal())
 	if err != nil {
 		return err
 	}
 
-	if fp.IsInactive() {
-		return fmt.Errorf("the finality provider %s is already detected as inactive", fpPk.MarshalHex())
+	if fp.IsSluggish() {
+		return fmt.Errorf("the finality provider %s is already detected as sluggish", fpPk.MarshalHex())
 	}
 
-	fp.Inactive = true
+	fp.Sluggish = true
 
 	h.k.SetFinalityProvider(ctx, fp)
 

x/btcstaking/types/btcstaking.go

@@ -6,18 +6,19 @@ import (
 
 	"cosmossdk.io/math"
 
+	sdk "github.com/cosmos/cosmos-sdk/types"
+
 	asig "github.com/babylonchain/babylon/crypto/schnorr-adaptor-signature"
 	bbn "github.com/babylonchain/babylon/types"
 	btcctypes "github.com/babylonchain/babylon/x/btccheckpoint/types"
-	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
 func (fp *FinalityProvider) IsSlashed() bool {
 	return fp.SlashedBabylonHeight > 0
 }
 
-func (fp *FinalityProvider) IsInactive() bool {
-	return fp.Inactive
+func (fp *FinalityProvider) IsSluggish() bool {
+	return fp.Sluggish
 }
 
 func (fp *FinalityProvider) ValidateBasic() error {