Repository: cosmos/cosmos-sdk (Go)

Issue:
[Feature]: Have a way to fetch halt-height from the node API somehow
### Summary

Would be lovely if there would be a way to get the halt-height of a specific node via the API it exposes (either via LCD or Tendermint/CometBFT API)

### Problem Definition

I am developing an exporter called https://github.com/QuokkaStake/cosmos-node-exporter.
It is designed for node runners/validators as a source of data to build alerts on metrics from chain/node, such as: whether there are upcoming upgrades, whether the voting power is above 0, etc.
It takes data from multiple sources, such as filesystem, Github and the node APIs.

One of the really useful alerts I have for myself is alert that will fire once there are less than 30 minutes before the upcoming upgrade.
This works for governance upgrades, but sometimes the chain developers decide to coordinate a chain halt so everybody would set a halt-height and stop the chain, then upgrade their nodes and restart their binaries with the new ones. (Namely, the Neutron chain had such an upgrade just yesterday.)

I want to build alerts on when the halt-height is less than 30 minutes from now (for cases I set a halt-height somewhere in the future and want to remind myself the node will shut down soon), and expose this metric from my exporter, so Prometheus would scrape it, evaluate alerts based on it and Alertmanager would sent me alerts  For calculating it, I need somehow to get the halt-height from the node.
I can already take it from the app.toml directly, but that won't be possible to get it if I do not have the access to the node's filesystem, so ideal solution would be to have it exposed by the API.

I already know there are some disadvantages to this as this is something that node owners probably won't want to expose, or maybe there are some other disadvantages, but anyways this would be lovely to have.

### Proposed Feature

Having an API method to return node's halt-height. Can be either RPC method/endpoint, or LCD method/endpoint, or both.


Discussion:
Yeah, this should be pretty easy via the existing `/cosmos/base/node/v1beta1/config` endpoint.
Wow, that was fast. @alexanderbez appreciate this a lot, and can you also clarify which release to expect it in?
It will be included in v0.50.3, planned for Monday.
@alexanderbez this seems to not work for me on `provider` chain (Hub incentivised testnet) - there's a field in REST/gRPC response but it's always 0, even if the halt-height is set to a value > 0. Can you check?



Patch:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 808f6fde0c14..442b14a19d83 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,7 @@ Every Module contains its own CHANGELOG.md. Please refer to the module you are i
 
 ### Features
 
+* (gRPC) [#19043](https://github.com/cosmos/cosmos-sdk/pull/19043) Add `halt_height` to the gRPC `/cosmos/base/node/v1beta1/config` request.
 * (types) [#18991](https://github.com/cosmos/cosmos-sdk/pull/18991) Add SignerExtractionAdapter to PriorityNonceMempool/Config and provide Default implementation matching existing behavior.
 * (client) [#18557](https://github.com/cosmos/cosmos-sdk/pull/18557) Add `--qrcode` flag to `keys show` command to support displaying keys address QR code.
 * (client) [#18101](https://github.com/cosmos/cosmos-sdk/pull/18101) Add a `keyring-default-keyname` in `client.toml` for specifying a default key name, and skip the need to use the `--from` flag when signing transactions.
@@ -50,7 +51,7 @@ Every Module contains its own CHANGELOG.md. Please refer to the module you are i
 * (runtime) [#18475](https://github.com/cosmos/cosmos-sdk/pull/18475) Adds an implementation for core.branch.Service.
 * (baseapp) [#18499](https://github.com/cosmos/cosmos-sdk/pull/18499) Add `MsgRouter` response type from message name function.
 * (types) [#18768](https://github.com/cosmos/cosmos-sdk/pull/18768) Add MustValAddressFromBech32 function.
-  
+
 ### Improvements
 
 * (client/keys) [#18950](https://github.com/cosmos/cosmos-sdk/pull/18950) Improve `<appd> keys add`, `<appd> keys import` and `<appd> keys rename` by checking name validation.
diff --git a/api/cosmos/base/node/v1beta1/query.pulsar.go b/api/cosmos/base/node/v1beta1/query.pulsar.go
index ff8148beebbb..f79e565e180b 100644
--- a/api/cosmos/base/node/v1beta1/query.pulsar.go
+++ b/api/cosmos/base/node/v1beta1/query.pulsar.go
@@ -376,6 +376,7 @@ var (
 	fd_ConfigResponse_minimum_gas_price   protoreflect.FieldDescriptor
 	fd_ConfigResponse_pruning_keep_recent protoreflect.FieldDescriptor
 	fd_ConfigResponse_pruning_interval    protoreflect.FieldDescriptor
+	fd_ConfigResponse_halt_height         protoreflect.FieldDescriptor
 )
 
 func init() {
@@ -384,6 +385,7 @@ func init() {
 	fd_ConfigResponse_minimum_gas_price = md_ConfigResponse.Fields().ByName("minimum_gas_price")
 	fd_ConfigResponse_pruning_keep_recent = md_ConfigResponse.Fields().ByName("pruning_keep_recent")
 	fd_ConfigResponse_pruning_interval = md_ConfigResponse.Fields().ByName("pruning_interval")
+	fd_ConfigResponse_halt_height = md_ConfigResponse.Fields().ByName("halt_height")
 }
 
 var _ protoreflect.Message = (*fastReflection_ConfigResponse)(nil)
@@ -469,6 +471,12 @@ func (x *fastReflection_ConfigResponse) Range(f func(protoreflect.FieldDescripto
 			return
 		}
 	}
+	if x.HaltHeight != uint64(0) {
+		value := protoreflect.ValueOfUint64(x.HaltHeight)
+		if !f(fd_ConfigResponse_halt_height, value) {
+			return
+		}
+	}
 }
 
 // Has reports whether a field is populated.
@@ -490,6 +498,8 @@ func (x *fastReflection_ConfigResponse) Has(fd protoreflect.FieldDescriptor) boo
 		return x.PruningKeepRecent != ""
 	case "cosmos.base.node.v1beta1.ConfigResponse.pruning_interval":
 		return x.PruningInterval != ""
+	case "cosmos.base.node.v1beta1.ConfigResponse.halt_height":
+		return x.HaltHeight != uint64(0)
 	default:
 		if fd.IsExtension() {
 			panic(fmt.Errorf("proto3 declared messages do not support extensions: cosmos.base.node.v1beta1.ConfigResponse"))
@@ -512,6 +522,8 @@ func (x *fastReflection_ConfigResponse) Clear(fd protoreflect.FieldDescriptor) {
 		x.PruningKeepRecent = ""
 	case "cosmos.base.node.v1beta1.ConfigResponse.pruning_interval":
 		x.PruningInterval = ""
+	case "cosmos.base.node.v1beta1.ConfigResponse.halt_height":
+		x.HaltHeight = uint64(0)
 	default:
 		if fd.IsExtension() {
 			panic(fmt.Errorf("proto3 declared messages do not support extensions: cosmos.base.node.v1beta1.ConfigResponse"))
@@ -537,6 +549,9 @@ func (x *fastReflection_ConfigResponse) Get(descriptor protoreflect.FieldDescrip
 	case "cosmos.base.node.v1beta1.ConfigResponse.pruning_interval":
 		value := x.PruningInterval
 		return protoreflect.ValueOfString(value)
+	case "cosmos.base.node.v1beta1.ConfigResponse.halt_height":
+		value := x.HaltHeight
+		return protoreflect.ValueOfUint64(value)
 	default:
 		if descriptor.IsExtension() {
 			panic(fmt.Errorf("proto3 declared messages do not support extensions: cosmos.base.node.v1beta1.ConfigResponse"))
@@ -563,6 +578,8 @@ func (x *fastReflection_ConfigResponse) Set(fd protoreflect.FieldDescriptor, val
 		x.PruningKeepRecent = value.Interface().(string)
 	case "cosmos.base.node.v1beta1.ConfigResponse.pruning_interval":
 		x.PruningInterval = value.Interface().(string)
+	case "cosmos.base.node.v1beta1.ConfigResponse.halt_height":
+		x.HaltHeight = value.Uint()
 	default:
 		if fd.IsExtension() {
 			panic(fmt.Errorf("proto3 declared messages do not support extensions: cosmos.base.node.v1beta1.ConfigResponse"))
@@ -589,6 +606,8 @@ func (x *fastReflection_ConfigResponse) Mutable(fd protoreflect.FieldDescriptor)
 		panic(fmt.Errorf("field pruning_keep_recent of message cosmos.base.node.v1beta1.ConfigResponse is not mutable"))
 	case "cosmos.base.node.v1beta1.ConfigResponse.pruning_interval":
 		panic(fmt.Errorf("field pruning_interval of message cosmos.base.node.v1beta1.ConfigResponse is not mutable"))
+	case "cosmos.base.node.v1beta1.ConfigResponse.halt_height":
+		panic(fmt.Errorf("field halt_height of message cosmos.base.node.v1beta1.ConfigResponse is not mutable"))
 	default:
 		if fd.IsExtension() {
 			panic(fmt.Errorf("proto3 declared messages do not support extensions: cosmos.base.node.v1beta1.ConfigResponse"))
@@ -608,6 +627,8 @@ func (x *fastReflection_ConfigResponse) NewField(fd protoreflect.FieldDescriptor
 		return protoreflect.ValueOfString("")
 	case "cosmos.base.node.v1beta1.ConfigResponse.pruning_interval":
 		return protoreflect.ValueOfString("")
+	case "cosmos.base.node.v1beta1.ConfigResponse.halt_height":
+		return protoreflect.ValueOfUint64(uint64(0))
 	default:
 		if fd.IsExtension() {
 			panic(fmt.Errorf("proto3 declared messages do not support extensions: cosmos.base.node.v1beta1.ConfigResponse"))
@@ -689,6 +710,9 @@ func (x *fastReflection_ConfigResponse) ProtoMethods() *protoiface.Methods {
 		if l > 0 {
 			n += 1 + l + runtime.Sov(uint64(l))
 		}
+		if x.HaltHeight != 0 {
+			n += 1 + runtime.Sov(uint64(x.HaltHeight))
+		}
 		if x.unknownFields != nil {
 			n += len(x.unknownFields)
 		}
@@ -718,6 +742,11 @@ func (x *fastReflection_ConfigResponse) ProtoMethods() *protoiface.Methods {
 			i -= len(x.unknownFields)
 			copy(dAtA[i:], x.unknownFields)
 		}
+		if x.HaltHeight != 0 {
+			i = runtime.EncodeVarint(dAtA, i, uint64(x.HaltHeight))
+			i--
+			dAtA[i] = 0x20
+		}
 		if len(x.PruningInterval) > 0 {
 			i -= len(x.PruningInterval)
 			copy(dAtA[i:], x.PruningInterval)
@@ -884,6 +913,25 @@ func (x *fastReflection_ConfigResponse) ProtoMethods() *protoiface.Methods {
 				}
 				x.PruningInterval = string(dAtA[iNdEx:postIndex])
 				iNdEx = postIndex
+			case 4:
+				if wireType != 0 {
+					return protoiface.UnmarshalOutput{NoUnkeyedLiterals: input.NoUnkeyedLiterals, Flags: input.Flags}, fmt.Errorf("proto: wrong wireType = %d for field HaltHeight", wireType)
+				}
+				x.HaltHeight = 0
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return protoiface.UnmarshalOutput{NoUnkeyedLiterals: input.NoUnkeyedLiterals, Flags: input.Flags}, runtime.ErrIntOverflow
+					}
+					if iNdEx >= l {
+						return protoiface.UnmarshalOutput{NoUnkeyedLiterals: input.NoUnkeyedLiterals, Flags: input.Flags}, io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					x.HaltHeight |= uint64(b&0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
 			default:
 				iNdEx = preIndex
 				skippy, err := runtime.Skip(dAtA[iNdEx:])
@@ -1984,10 +2032,10 @@ type ConfigResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	MinimumGasPrice string `protobuf:"bytes,1,opt,name=minimum_gas_price,json=minimumGasPrice,proto3" json:"minimum_gas_price,omitempty"`
-	// pruning settings
+	MinimumGasPrice   string `protobuf:"bytes,1,opt,name=minimum_gas_price,json=minimumGasPrice,proto3" json:"minimum_gas_price,omitempty"`
 	PruningKeepRecent string `protobuf:"bytes,2,opt,name=pruning_keep_recent,json=pruningKeepRecent,proto3" json:"pruning_keep_recent,omitempty"`
 	PruningInterval   string `protobuf:"bytes,3,opt,name=pruning_interval,json=pruningInterval,proto3" json:"pruning_interval,omitempty"`
+	HaltHeight        uint64 `protobuf:"varint,4,opt,name=halt_height,json=haltHeight,proto3" json:"halt_height,omitempty"`
 }
 
 func (x *ConfigResponse) Reset() {
@@ -2031,6 +2079,13 @@ func (x *ConfigResponse) GetPruningInterval() string {
 	return ""
 }
 
+func (x *ConfigResponse) GetHaltHeight() uint64 {
+	if x != nil {
+		return x.HaltHeight
+	}
+	return 0
+}
+
 // StateRequest defines the request structure for the status of a node.
 type StatusRequest struct {
 	state         protoimpl.MessageState
@@ -2139,7 +2194,7 @@ var file_cosmos_base_node_v1beta1_query_proto_rawDesc = []byte{
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@@ -2149,54 +2204,56 @@ var file_cosmos_base_node_v1beta1_query_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/client/grpc/node/query.pb.go b/client/grpc/node/query.pb.go
index 8e56808aa627..a2c96dc1ec2f 100644
--- a/client/grpc/node/query.pb.go
+++ b/client/grpc/node/query.pb.go
@@ -72,10 +72,10 @@ var xxx_messageInfo_ConfigRequest proto.InternalMessageInfo
 
 // ConfigResponse defines the response structure for the Config gRPC query.
 type ConfigResponse struct {
-	MinimumGasPrice string `protobuf:"bytes,1,opt,name=minimum_gas_price,json=minimumGasPrice,proto3" json:"minimum_gas_price,omitempty"`
-	// pruning settings
+	MinimumGasPrice   string `protobuf:"bytes,1,opt,name=minimum_gas_price,json=minimumGasPrice,proto3" json:"minimum_gas_price,omitempty"`
 	PruningKeepRecent string `protobuf:"bytes,2,opt,name=pruning_keep_recent,json=pruningKeepRecent,proto3" json:"pruning_keep_recent,omitempty"`
 	PruningInterval   string `protobuf:"bytes,3,opt,name=pruning_interval,json=pruningInterval,proto3" json:"pruning_interval,omitempty"`
+	HaltHeight        uint64 `protobuf:"varint,4,opt,name=halt_height,json=haltHeight,proto3" json:"halt_height,omitempty"`
 }
 
 func (m *ConfigResponse) Reset()         { *m = ConfigResponse{} }
@@ -132,6 +132,13 @@ func (m *ConfigResponse) GetPruningInterval() string {
 	return ""
 }
 
+func (m *ConfigResponse) GetHaltHeight() uint64 {
+	if m != nil {
+		return m.HaltHeight
+	}
+	return 0
+}
+
 // StateRequest defines the request structure for the status of a node.
 type StatusRequest struct {
 }
@@ -258,39 +265,40 @@ func init() {
 }
 
 var fileDescriptor_8324226a07064341 = []byte{
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+	0x6b, 0xdc, 0x23, 0xde, 0x06, 0xd2, 0xd8, 0x40, 0xde, 0x36, 0xc4, 0xe1, 0xfa, 0xf9, 0xcf, 0x7e,
+	0x10, 0xfd, 0x4d, 0xc1, 0x0f, 0xd0, 0x2d, 0xa6, 0x54, 0x9c, 0x31, 0x93, 0xb9, 0x69, 0x6e, 0x47,
+	0x1b, 0x4c, 0xa9, 0x63, 0x66, 0x32, 0xfc, 0x18, 0x75, 0xe6, 0x2c, 0xe7, 0x33, 0x66, 0xa5, 0xf6,
+	0xc0, 0x4d, 0x07, 0x6c, 0x5f, 0xaa, 0x15, 0x36, 0xfe, 0xdc, 0x42, 0x1b, 0x13, 0xd0, 0xf3, 0x6a,
+	0xf3, 0x1f, 0x03, 0xd4, 0xf6, 0xc6, 0xe1, 0x27, 0xe4, 0xaa, 0x47, 0x44, 0x56, 0xcc, 0xee, 0x8d,
+	0xfe, 0x0d, 0xfa, 0xbd, 0x0d, 0x47, 0x1f, 0xbe, 0xfd, 0xfe, 0xd4, 0x1a, 0xe2, 0x01, 0xbd, 0xf2,
+	0x15, 0x27, 0xfe, 0xe7, 0x55, 0x1f, 0x7e, 0xe9, 0xd7, 0xf5, 0xb1, 0x62, 0xd4, 0x75, 0x7d, 0xac,
+	0xfa, 0xf7, 0x3f, 0x7d, 0x18, 0x97, 0x71, 0x78, 0xf4, 0x75, 0x11, 0x06, 0x17, 0x8b, 0x30, 0xf8,
+	0xb5, 0x08, 0x83, 0xf3, 0x65, 0xb8, 0x76, 0xb1, 0x0c, 0xd7, 0xbe, 0x2f, 0xc3, 0xb5, 0x77, 0xfb,
+	0x29, 0xb7, 0x59, 0x39, 0x25, 0x89, 0x2c, 0x9a, 0x2a, 0xfe, 0xb3, 0x6f, 0x66, 0xa7, 0x34, 0xc9,
+	0x39, 0x08, 0x4b, 0x53, 0xad, 0x12, 0x57, 0x77, 0xda, 0x76, 0x5e, 0x3e, 0xff, 0x13, 0x00, 0x00,
+	0xff, 0xff, 0x0c, 0x93, 0xa1, 0xea, 0xc0, 0x03, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -456,6 +464,11 @@ func (m *ConfigResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.HaltHeight != 0 {
+		i = encodeVarintQuery(dAtA, i, uint64(m.HaltHeight))
+		i--
+		dAtA[i] = 0x20
+	}
 	if len(m.PruningInterval) > 0 {
 		i -= len(m.PruningInterval)
 		copy(dAtA[i:], m.PruningInterval)
@@ -598,6 +611,9 @@ func (m *ConfigResponse) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovQuery(uint64(l))
 	}
+	if m.HaltHeight != 0 {
+		n += 1 + sovQuery(uint64(m.HaltHeight))
+	}
 	return n
 }
 
@@ -818,6 +834,25 @@ func (m *ConfigResponse) Unmarshal(dAtA []byte) error {
 			}
 			m.PruningInterval = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field HaltHeight", wireType)
+			}
+			m.HaltHeight = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowQuery
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.HaltHeight |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipQuery(dAtA[iNdEx:])
diff --git a/client/grpc/node/service.go b/client/grpc/node/service.go
index a83b7b5bd801..29094382ff66 100644
--- a/client/grpc/node/service.go
+++ b/client/grpc/node/service.go
@@ -42,6 +42,7 @@ func (s queryServer) Config(ctx context.Context, _ *ConfigRequest) (*ConfigRespo
 		MinimumGasPrice:   sdkCtx.MinGasPrices().String(),
 		PruningKeepRecent: s.cfg.PruningKeepRecent,
 		PruningInterval:   s.cfg.PruningInterval,
+		HaltHeight:        s.cfg.HaltHeight,
 	}, nil
 }
 
diff --git a/proto/cosmos/base/node/v1beta1/query.proto b/proto/cosmos/base/node/v1beta1/query.proto
index 33dd9667ba32..95df568f1175 100644
--- a/proto/cosmos/base/node/v1beta1/query.proto
+++ b/proto/cosmos/base/node/v1beta1/query.proto
@@ -24,10 +24,10 @@ message ConfigRequest {}
 
 // ConfigResponse defines the response structure for the Config gRPC query.
 message ConfigResponse {
-  string minimum_gas_price = 1;
-  // pruning settings
+  string minimum_gas_price   = 1;
   string pruning_keep_recent = 2;
   string pruning_interval    = 3;
+  uint64 halt_height         = 4;
 }
 
 // StateRequest defines the request structure for the status of a node.


Test patch:
diff --git a/client/grpc/node/service_test.go b/client/grpc/node/service_test.go
index 2cbc07d3dda8..41ce2a2cc50c 100644
--- a/client/grpc/node/service_test.go
+++ b/client/grpc/node/service_test.go
@@ -11,11 +11,13 @@ import (
 )
 
 func TestServiceServer_Config(t *testing.T) {
-	svr := NewQueryServer(client.Context{}, *config.DefaultConfig())
+	defaultCfg := config.DefaultConfig()
+	svr := NewQueryServer(client.Context{}, *defaultCfg)
 	ctx := sdk.Context{}.WithMinGasPrices(sdk.NewDecCoins(sdk.NewInt64DecCoin("stake", 15)))
 
 	resp, err := svr.Config(ctx, &ConfigRequest{})
 	require.NoError(t, err)
 	require.NotNil(t, resp)
 	require.Equal(t, ctx.MinGasPrices().String(), resp.MinimumGasPrice)
+	require.Equal(t, defaultCfg.HaltHeight, resp.HaltHeight)
 }