BTC staking: events for BTC validator/delegation programs (#11)

proto/babylon/btcstaking/v1/events.proto

@@ -0,0 +1,18 @@
+syntax = "proto3";
+package babylon.btcstaking.v1;
+
+import "babylon/btcstaking/v1/btcstaking.proto";
+
+option go_package = "github.com/babylonchain/babylon/x/btcstaking/types";
+
+// EventNewBTCValidator is the event emitted when a BTC validator is created
+message EventNewBTCValidator { BTCValidator btc_val = 1; }
+
+// EventNewBTCDelegation is the event emitted when a BTC delegation is created
+// NOTE: the BTC delegation is not active thus does not have voting power yet
+// only after it receives a jury signature it becomes activated and has voting power
+message EventNewBTCDelegation { BTCDelegation btc_del = 1; }
+
+// EventActivateBTCDelegation is the event emitted when jury activates a BTC delegation
+// such that the BTC delegation starts to have voting power in its timelock period
+message EventActivateBTCDelegation { BTCDelegation btc_del = 1; }

x/btcstaking/keeper/msg_server.go

@@ -56,6 +56,11 @@ func (ms msgServer) CreateBTCValidator(goCtx context.Context, req *types.MsgCrea
 	}
 	ms.setBTCValidator(ctx, &btcVal)
 
+	// notify subscriber
+	if err := ctx.EventManager().EmitTypedEvent(&types.EventNewBTCValidator{BtcVal: &btcVal}); err != nil {
+		return nil, err
+	}
+
 	return &types.MsgCreateBTCValidatorResponse{}, nil
 }
 
@@ -134,6 +139,9 @@ func (ms msgServer) CreateBTCDelegation(goCtx context.Context, req *types.MsgCre
 	}
 
 	// all good, construct BTCDelegation and insert BTC delegation
+	// NOTE: the BTC delegation does not have voting power yet. It will
+	// have voting power only when 1) its corresponding staking tx is k-deep,
+	// and 2) it receives a jury signature
 	newBTCDel := &types.BTCDelegation{
 		BabylonPk:    req.BabylonPk,
 		BtcPk:        delBTCPK,
@@ -149,6 +157,11 @@ func (ms msgServer) CreateBTCDelegation(goCtx context.Context, req *types.MsgCre
 	}
 	ms.setBTCDelegation(ctx, newBTCDel)
 
+	// notify subscriber
+	if err := ctx.EventManager().EmitTypedEvent(&types.EventNewBTCDelegation{BtcDel: newBTCDel}); err != nil {
+		return nil, err
+	}
+
 	return &types.MsgCreateBTCDelegationResponse{}, nil
 }
 
@@ -193,5 +206,10 @@ func (ms msgServer) AddJurySig(goCtx context.Context, req *types.MsgAddJurySig)
 	btcDel.JurySig = req.Sig
 	ms.setBTCDelegation(ctx, btcDel)
 
+	// notify subscriber
+	if err := ctx.EventManager().EmitTypedEvent(&types.EventActivateBTCDelegation{BtcDel: btcDel}); err != nil {
+		return nil, err
+	}
+
 	return &types.MsgAddJurySigResponse{}, nil
 }