feat(rtt): 'machine rtt' command to show round-trip time between macines usign using gossip data (#226)

* Add corrosion admin client function to get RTT to other machines in the cluster * Add `uc machine rtt` showing all pair-wise RTT stats from corrosion * Add long description to machine rtt command * Include machine peer RTTs in InspectMachine instead of adding new gRPC API for it * Add nil check on InspectMachine's Rtt field to protect from a potential edge case * Generate docs for machine rtt command * Handle m.Message being nil when a node is down or unavailble * Update cli-docs * Use tui Table instead of tabwriter * Change reported RTT to the median rather than mean. Still calculate include stddev, as it might be a useful indication of network jitter. * Show RTT to peers in `wg show` output * Update cli docs
2026-08-26 11:03:34 +00:00 · 2026-04-20 08:01:20 +10:00
parent 1c0d48cb46
commit 8d023f5c53
10 changed files with 564 additions and 156 deletions
@@ -6,8 +6,10 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math"
 	"net"
 	"net/netip"
+	"sort"
 	"time"
 )

@@ -256,3 +258,106 @@ func (c *AdminClient) ClusterMembershipStates(latest bool) ([]ClusterMembershipS
 	}
 	return states, parseErr
 }
+
+type MemberRTTStats struct {
+	Addr   netip.AddrPort
+	Median float64
+	StdDev float64
+}
+
+// ClusterMemberRTTs returns the median and standard deviation of round-trip times to each cluster member.
+func (c *AdminClient) ClusterMemberRTTs() ([]MemberRTTStats, error) {
+	respCh, err := c.SendCommand([]byte("{\"Cluster\":\"Members\"}"))
+	if err != nil {
+		return nil, err
+	}
+
+	var stats []MemberRTTStats
+	var parseErr error
+
+	for r := range respCh {
+		if r.Err != nil {
+			return nil, r.Err
+		}
+
+		addr, rtts, err := parseClusterMemberRTT(r.JSON)
+		if err != nil {
+			parseErr = errors.Join(parseErr, err)
+			continue
+		}
+
+		if len(rtts) == 0 {
+			continue
+		}
+
+		sort.Float64s(rtts)
+		n := len(rtts)
+		var median float64
+		if n%2 == 0 {
+			median = (rtts[n/2-1] + rtts[n/2]) / 2
+		} else {
+			median = rtts[n/2]
+		}
+
+		var sum float64
+		for _, rtt := range rtts {
+			sum += rtt
+		}
+		avg := sum / float64(n)
+
+		var varianceSum float64
+		for _, rtt := range rtts {
+			diff := rtt - avg
+			varianceSum += diff * diff
+		}
+		stdDev := math.Sqrt(varianceSum / float64(n))
+
+		stats = append(stats, MemberRTTStats{
+			Addr:   addr,
+			Median: median,
+			StdDev: stdDev,
+		})
+	}
+
+	return stats, parseErr
+}
+
+func parseClusterMemberRTT(json map[string]any) (netip.AddrPort, []float64, error) {
+	var addr netip.AddrPort
+	var rtts []float64
+	var err error
+
+	// Parse state to get Addr
+	stateObj, ok := json["state"].(map[string]any)
+	if !ok {
+		return addr, nil, fmt.Errorf("missing or invalid 'state' field")
+	}
+
+	if addrStr, ok := stateObj["addr"].(string); ok {
+		addr, err = netip.ParseAddrPort(addrStr)
+		if err != nil {
+			return addr, nil, fmt.Errorf("parse 'addr' field: %w", err)
+		}
+	} else {
+		return addr, nil, fmt.Errorf("missing or invalid 'addr' field in 'state'")
+	}
+
+	// Parse RTTs
+	if rttsVal, ok := json["rtts"]; ok {
+		if rttsSlice, ok := rttsVal.([]any); ok {
+			for _, v := range rttsSlice {
+				if f, ok := v.(float64); ok {
+					rtts = append(rtts, f)
+				} else {
+					return addr, nil, fmt.Errorf("invalid rtt value type: %T", v)
+				}
+			}
+		} else {
+			return addr, nil, fmt.Errorf("invalid 'rtts' field type: %T", rttsVal)
+		}
+	} else {
+		return addr, nil, fmt.Errorf("missing 'rtts' field")
+	}
+
+	return addr, rtts, nil
+}
@@ -495,6 +495,8 @@ type MachineDetails struct {
 	Machine  *MachineInfo `protobuf:"bytes,2,opt,name=machine,proto3" json:"machine,omitempty"`
 	// Current Corrosion cr-sqlite database version (Lamport timestamp) of the cluster store.
 	StoreDbVersion int64 `protobuf:"varint,3,opt,name=store_db_version,json=storeDbVersion,proto3" json:"store_db_version,omitempty"`
+	// Round-trip times to other machines in the cluster, keyed by peer machine ID.
+	Rtts map[string]*RTTStats `protobuf:"bytes,4,rep,name=rtts,proto3" json:"rtts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }

 func (x *MachineDetails) Reset() {
@@ -550,6 +552,13 @@ func (x *MachineDetails) GetStoreDbVersion() int64 {
 	return 0
 }

+func (x *MachineDetails) GetRtts() map[string]*RTTStats {
+	if x != nil {
+		return x.Rtts
+	}
+	return nil
+}
+
 type TokenResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -958,6 +967,61 @@ func (x *WireGuardPeer) GetAllowedIps() []string {
 	return nil
 }

+type RTTStats struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Median float64 `protobuf:"fixed64,1,opt,name=median,proto3" json:"median,omitempty"`
+	StdDev float64 `protobuf:"fixed64,2,opt,name=std_dev,json=stdDev,proto3" json:"std_dev,omitempty"`
+}
+
+func (x *RTTStats) Reset() {
+	*x = RTTStats{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RTTStats) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RTTStats) ProtoMessage() {}
+
+func (x *RTTStats) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RTTStats.ProtoReflect.Descriptor instead.
+func (*RTTStats) Descriptor() ([]byte, []int) {
+	return file_internal_machine_api_pb_machine_proto_rawDescGZIP(), []int{15}
+}
+
+func (x *RTTStats) GetMedian() float64 {
+	if x != nil {
+		return x.Median
+	}
+	return 0
+}
+
+func (x *RTTStats) GetStdDev() float64 {
+	if x != nil {
+		return x.StdDev
+	}
+	return 0
+}
+
 type Service_Container struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -971,7 +1035,7 @@ type Service_Container struct {
 func (x *Service_Container) Reset() {
 	*x = Service_Container{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -984,7 +1048,7 @@ func (x *Service_Container) String() string {
 func (*Service_Container) ProtoMessage() {}

 func (x *Service_Container) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1086,7 +1150,7 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
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+	0x6f, 0x33,
 }

 var (
@@ -1206,7 +1282,7 @@ func file_internal_machine_api_pb_machine_proto_rawDescGZIP() []byte {
 	return file_internal_machine_api_pb_machine_proto_rawDescData
 }

-var file_internal_machine_api_pb_machine_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
+var file_internal_machine_api_pb_machine_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
 var file_internal_machine_api_pb_machine_proto_goTypes = []any{
 	(*MachineInfo)(nil),                     // 0: api.MachineInfo
 	(*NetworkConfig)(nil),                   // 1: api.NetworkConfig
@@ -1223,60 +1299,64 @@ var file_internal_machine_api_pb_machine_proto_goTypes = []any{
 	(*InspectServiceResponse)(nil),          // 12: api.InspectServiceResponse
 	(*InspectWireGuardNetworkResponse)(nil), // 13: api.InspectWireGuardNetworkResponse
 	(*WireGuardPeer)(nil),                   // 14: api.WireGuardPeer
-	(*Service_Container)(nil),               // 15: api.Service.Container
-	(*IP)(nil),                              // 16: api.IP
-	(*IPPrefix)(nil),                        // 17: api.IPPrefix
-	(*IPPort)(nil),                          // 18: api.IPPort
-	(*Metadata)(nil),                        // 19: api.Metadata
-	(*timestamppb.Timestamp)(nil),           // 20: google.protobuf.Timestamp
-	(*emptypb.Empty)(nil),                   // 21: google.protobuf.Empty
-	(*LogsRequest)(nil),                     // 22: api.LogsRequest
-	(*LogEntry)(nil),                        // 23: api.LogEntry
+	(*RTTStats)(nil),                        // 15: api.RTTStats
+	nil,                                     // 16: api.MachineDetails.RttsEntry
+	(*Service_Container)(nil),               // 17: api.Service.Container
+	(*IP)(nil),                              // 18: api.IP
+	(*IPPrefix)(nil),                        // 19: api.IPPrefix
+	(*IPPort)(nil),                          // 20: api.IPPort
+	(*Metadata)(nil),                        // 21: api.Metadata
+	(*timestamppb.Timestamp)(nil),           // 22: google.protobuf.Timestamp
+	(*emptypb.Empty)(nil),                   // 23: google.protobuf.Empty
+	(*LogsRequest)(nil),                     // 24: api.LogsRequest
+	(*LogEntry)(nil),                        // 25: api.LogEntry
 }
 var file_internal_machine_api_pb_machine_proto_depIdxs = []int32{
 	1,  // 0: api.MachineInfo.network:type_name -> api.NetworkConfig
-	16, // 1: api.MachineInfo.public_ip:type_name -> api.IP
-	17, // 2: api.NetworkConfig.subnet:type_name -> api.IPPrefix
-	16, // 3: api.NetworkConfig.management_ip:type_name -> api.IP
-	18, // 4: api.NetworkConfig.endpoints:type_name -> api.IPPort
-	17, // 5: api.InitClusterRequest.network:type_name -> api.IPPrefix
-	16, // 6: api.InitClusterRequest.public_ip:type_name -> api.IP
-	18, // 7: api.InitClusterRequest.wireguard_endpoints:type_name -> api.IPPort
+	18, // 1: api.MachineInfo.public_ip:type_name -> api.IP
+	19, // 2: api.NetworkConfig.subnet:type_name -> api.IPPrefix
+	18, // 3: api.NetworkConfig.management_ip:type_name -> api.IP
+	20, // 4: api.NetworkConfig.endpoints:type_name -> api.IPPort
+	19, // 5: api.InitClusterRequest.network:type_name -> api.IPPrefix
+	18, // 6: api.InitClusterRequest.public_ip:type_name -> api.IP
+	20, // 7: api.InitClusterRequest.wireguard_endpoints:type_name -> api.IPPort
 	0,  // 8: api.InitClusterResponse.machine:type_name -> api.MachineInfo
 	0,  // 9: api.JoinClusterRequest.machine:type_name -> api.MachineInfo
 	0,  // 10: api.JoinClusterRequest.other_machines:type_name -> api.MachineInfo
 	7,  // 11: api.InspectMachineResponse.machines:type_name -> api.MachineDetails
-	19, // 12: api.MachineDetails.metadata:type_name -> api.Metadata
+	21, // 12: api.MachineDetails.metadata:type_name -> api.Metadata
 	0,  // 13: api.MachineDetails.machine:type_name -> api.MachineInfo
-	15, // 14: api.Service.containers:type_name -> api.Service.Container
-	10, // 15: api.InspectServiceResponse.service:type_name -> api.Service
-	14, // 16: api.InspectWireGuardNetworkResponse.peers:type_name -> api.WireGuardPeer
-	20, // 17: api.WireGuardPeer.last_handshake_time:type_name -> google.protobuf.Timestamp
-	21, // 18: api.Machine.CheckPrerequisites:input_type -> google.protobuf.Empty
-	3,  // 19: api.Machine.InitCluster:input_type -> api.InitClusterRequest
-	5,  // 20: api.Machine.JoinCluster:input_type -> api.JoinClusterRequest
-	21, // 21: api.Machine.Token:input_type -> google.protobuf.Empty
-	21, // 22: api.Machine.Inspect:input_type -> google.protobuf.Empty
-	21, // 23: api.Machine.InspectMachine:input_type -> google.protobuf.Empty
-	21, // 24: api.Machine.InspectWireGuardNetwork:input_type -> google.protobuf.Empty
-	9,  // 25: api.Machine.Reset:input_type -> api.ResetRequest
-	11, // 26: api.Machine.InspectService:input_type -> api.InspectServiceRequest
-	22, // 27: api.Machine.MachineLogs:input_type -> api.LogsRequest
-	2,  // 28: api.Machine.CheckPrerequisites:output_type -> api.CheckPrerequisitesResponse
-	4,  // 29: api.Machine.InitCluster:output_type -> api.InitClusterResponse
-	21, // 30: api.Machine.JoinCluster:output_type -> google.protobuf.Empty
-	8,  // 31: api.Machine.Token:output_type -> api.TokenResponse
-	0,  // 32: api.Machine.Inspect:output_type -> api.MachineInfo
-	6,  // 33: api.Machine.InspectMachine:output_type -> api.InspectMachineResponse
-	13, // 34: api.Machine.InspectWireGuardNetwork:output_type -> api.InspectWireGuardNetworkResponse
-	21, // 35: api.Machine.Reset:output_type -> google.protobuf.Empty
-	12, // 36: api.Machine.InspectService:output_type -> api.InspectServiceResponse
-	23, // 37: api.Machine.MachineLogs:output_type -> api.LogEntry
-	28, // [28:38] is the sub-list for method output_type
-	18, // [18:28] is the sub-list for method input_type
-	18, // [18:18] is the sub-list for extension type_name
-	18, // [18:18] is the sub-list for extension extendee
-	0,  // [0:18] is the sub-list for field type_name
+	16, // 14: api.MachineDetails.rtts:type_name -> api.MachineDetails.RttsEntry
+	17, // 15: api.Service.containers:type_name -> api.Service.Container
+	10, // 16: api.InspectServiceResponse.service:type_name -> api.Service
+	14, // 17: api.InspectWireGuardNetworkResponse.peers:type_name -> api.WireGuardPeer
+	22, // 18: api.WireGuardPeer.last_handshake_time:type_name -> google.protobuf.Timestamp
+	15, // 19: api.MachineDetails.RttsEntry.value:type_name -> api.RTTStats
+	23, // 20: api.Machine.CheckPrerequisites:input_type -> google.protobuf.Empty
+	3,  // 21: api.Machine.InitCluster:input_type -> api.InitClusterRequest
+	5,  // 22: api.Machine.JoinCluster:input_type -> api.JoinClusterRequest
+	23, // 23: api.Machine.Token:input_type -> google.protobuf.Empty
+	23, // 24: api.Machine.Inspect:input_type -> google.protobuf.Empty
+	23, // 25: api.Machine.InspectMachine:input_type -> google.protobuf.Empty
+	23, // 26: api.Machine.InspectWireGuardNetwork:input_type -> google.protobuf.Empty
+	9,  // 27: api.Machine.Reset:input_type -> api.ResetRequest
+	11, // 28: api.Machine.InspectService:input_type -> api.InspectServiceRequest
+	24, // 29: api.Machine.MachineLogs:input_type -> api.LogsRequest
+	2,  // 30: api.Machine.CheckPrerequisites:output_type -> api.CheckPrerequisitesResponse
+	4,  // 31: api.Machine.InitCluster:output_type -> api.InitClusterResponse
+	23, // 32: api.Machine.JoinCluster:output_type -> google.protobuf.Empty
+	8,  // 33: api.Machine.Token:output_type -> api.TokenResponse
+	0,  // 34: api.Machine.Inspect:output_type -> api.MachineInfo
+	6,  // 35: api.Machine.InspectMachine:output_type -> api.InspectMachineResponse
+	13, // 36: api.Machine.InspectWireGuardNetwork:output_type -> api.InspectWireGuardNetworkResponse
+	23, // 37: api.Machine.Reset:output_type -> google.protobuf.Empty
+	12, // 38: api.Machine.InspectService:output_type -> api.InspectServiceResponse
+	25, // 39: api.Machine.MachineLogs:output_type -> api.LogEntry
+	30, // [30:40] is the sub-list for method output_type
+	20, // [20:30] is the sub-list for method input_type
+	20, // [20:20] is the sub-list for extension type_name
+	20, // [20:20] is the sub-list for extension extendee
+	0,  // [0:20] is the sub-list for field type_name
 }

 func init() { file_internal_machine_api_pb_machine_proto_init() }
@@ -1467,6 +1547,18 @@ func file_internal_machine_api_pb_machine_proto_init() {
 			}
 		}
 		file_internal_machine_api_pb_machine_proto_msgTypes[15].Exporter = func(v any, i int) any {
+			switch v := v.(*RTTStats); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_internal_machine_api_pb_machine_proto_msgTypes[17].Exporter = func(v any, i int) any {
 			switch v := v.(*Service_Container); i {
 			case 0:
 				return &v.state
@@ -1489,7 +1581,7 @@ func file_internal_machine_api_pb_machine_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_internal_machine_api_pb_machine_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   16,
+			NumMessages:   18,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
@@ -83,6 +83,8 @@ message MachineDetails {
  MachineInfo machine = 2;
  // Current Corrosion cr-sqlite database version (Lamport timestamp) of the cluster store.
  int64 store_db_version = 3;
+  // Round-trip times to other machines in the cluster, keyed by peer machine ID.
+  map<string, RTTStats> rtts = 4;
 }

 message TokenResponse {
@@ -129,3 +131,8 @@ message WireGuardPeer {
  int64 transmit_bytes = 5;
  repeated string allowed_ips = 6;
 }
+
+message RTTStats {
+  double median = 1;
+  double std_dev = 2;
+}
@@ -344,3 +344,8 @@ func (c *Cluster) RemoveMachine(ctx context.Context, req *pb.RemoveMachineReques

 	return &emptypb.Empty{}, nil
 }
+
+// MemberRTTs returns the average and standard deviation of round-trip times from this member to each cluster member.
+func (c *Cluster) MemberRTTs() ([]corrosion.MemberRTTStats, error) {
+	return c.corroAdmin.ClusterMemberRTTs()
+}
@@ -912,6 +912,14 @@ func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.Ins
 		return nil, status.Errorf(codes.Internal, "get database version of the cluster store: %v", err)
 	}

+	var rtts map[string]*pb.RTTStats
+	if m.Initialised() {
+		rtts, err = m.getMachineRTTs(ctx)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	return &pb.InspectMachineResponse{
 		Machines: []*pb.MachineDetails{
 			{
@@ -926,11 +934,46 @@ func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.Ins
 					},
 				},
 				StoreDbVersion: dbVersion,
+				Rtts:           rtts,
 			},
 		},
 	}, nil
 }

+// getMachineRTTs retrieves round-trip times to other machines in the cluster.
+func (m *Machine) getMachineRTTs(ctx context.Context) (map[string]*pb.RTTStats, error) {
+	rtts, err := m.cluster.MemberRTTs()
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "get member rtts: %v", err)
+	}
+
+	// List machines to map IPs to Machine IDs.
+	machines, err := m.store.ListMachines(ctx)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "list machines: %v", err)
+	}
+
+	// Map Management IP -> Machine ID
+	ipToMachineID := make(map[netip.Addr]string)
+	for _, mach := range machines {
+		ip, _ := mach.Network.ManagementIp.ToAddr()
+		ipToMachineID[ip] = mach.Id
+	}
+
+	pbRTTs := make(map[string]*pb.RTTStats)
+	for _, stats := range rtts {
+		// Corrosion uses the management IP for gossip.
+		if mid, ok := ipToMachineID[stats.Addr.Addr()]; ok {
+			pbRTTs[mid] = &pb.RTTStats{
+				Median: stats.Median,
+				StdDev: stats.StdDev,
+			}
+		}
+	}
+
+	return pbRTTs, nil
+}
+
 // IsNetworkReady returns true if the Docker network is ready for containers.
 func (m *Machine) IsNetworkReady() bool {
 	if !m.Initialised() {