grpc for QueryStats

app/stats/command/command.go

@@ -6,14 +6,22 @@ import (
 	"context"
 
 	grpc "google.golang.org/grpc"
+
 	"v2ray.com/core"
+	"v2ray.com/core/app/stats"
 	"v2ray.com/core/common"
+	"v2ray.com/core/common/strmatcher"
 )
 
+// statsServer is an implementation of StatsService.
 type statsServer struct {
 	stats core.StatManager
 }
 
+func NewStatsServer(manager core.StatManager) StatsServiceServer {
+	return &statsServer{stats: manager}
+}
+
 func (s *statsServer) GetStats(ctx context.Context, request *GetStatsRequest) (*GetStatsResponse, error) {
 	c := s.stats.GetCounter(request.Name)
 	if c == nil {
@@ -33,14 +41,44 @@ func (s *statsServer) GetStats(ctx context.Context, request *GetStatsRequest) (*
 	}, nil
 }
 
+func (s *statsServer) QueryStats(ctx context.Context, request *QueryStatsRequest) (*QueryStatsResponse, error) {
+	matcher, err := strmatcher.Substr.New(request.Pattern)
+	if err != nil {
+		return nil, err
+	}
+
+	response := &QueryStatsResponse{}
+
+	manager, ok := s.stats.(*stats.Manager)
+	if !ok {
+		return nil, newError("QueryStats only works its own stats.Manager.")
+	}
+
+	manager.Visit(func(name string, c core.StatCounter) bool {
+		if matcher.Match(name) {
+			var value int64
+			if request.Reset_ {
+				value = c.Set(0)
+			} else {
+				value = c.Value()
+			}
+			response.Stat = append(response.Stat, &Stat{
+				Name:  name,
+				Value: value,
+			})
+		}
+		return true
+	})
+
+	return response, nil
+}
+
 type service struct {
 	v *core.Instance
 }
 
 func (s *service) Register(server *grpc.Server) {
-	RegisterStatsServiceServer(server, &statsServer{
-		stats: s.v.Stats(),
-	})
+	RegisterStatsServiceServer(server, NewStatsServer(s.v.Stats()))
 }
 
 func init() {

app/stats/command/command.pb.go

@@ -5,8 +5,7 @@ import fmt "fmt"
 import math "math"
 
 import (
-	"context"
-
+	context "golang.org/x/net/context"
 	grpc "google.golang.org/grpc"
 )
 
@@ -35,7 +34,7 @@ func (m *GetStatsRequest) Reset()         { *m = GetStatsRequest{} }
 func (m *GetStatsRequest) String() string { return proto.CompactTextString(m) }
 func (*GetStatsRequest) ProtoMessage()    {}
 func (*GetStatsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_command_a956deb495595f76, []int{0}
+	return fileDescriptor_command_d2105e779ee1253c, []int{0}
 }
 func (m *GetStatsRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetStatsRequest.Unmarshal(m, b)
@@ -81,7 +80,7 @@ func (m *Stat) Reset()         { *m = Stat{} }
 func (m *Stat) String() string { return proto.CompactTextString(m) }
 func (*Stat) ProtoMessage()    {}
 func (*Stat) Descriptor() ([]byte, []int) {
-	return fileDescriptor_command_a956deb495595f76, []int{1}
+	return fileDescriptor_command_d2105e779ee1253c, []int{1}
 }
 func (m *Stat) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Stat.Unmarshal(m, b)
@@ -126,7 +125,7 @@ func (m *GetStatsResponse) Reset()         { *m = GetStatsResponse{} }
 func (m *GetStatsResponse) String() string { return proto.CompactTextString(m) }
 func (*GetStatsResponse) ProtoMessage()    {}
 func (*GetStatsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_command_a956deb495595f76, []int{2}
+	return fileDescriptor_command_d2105e779ee1253c, []int{2}
 }
 func (m *GetStatsResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetStatsResponse.Unmarshal(m, b)
@@ -153,6 +152,90 @@ func (m *GetStatsResponse) GetStat() *Stat {
 	return nil
 }
 
+type QueryStatsRequest struct {
+	Pattern              string   `protobuf:"bytes,1,opt,name=pattern,proto3" json:"pattern,omitempty"`
+	Reset_               bool     `protobuf:"varint,2,opt,name=reset,proto3" json:"reset,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *QueryStatsRequest) Reset()         { *m = QueryStatsRequest{} }
+func (m *QueryStatsRequest) String() string { return proto.CompactTextString(m) }
+func (*QueryStatsRequest) ProtoMessage()    {}
+func (*QueryStatsRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_command_d2105e779ee1253c, []int{3}
+}
+func (m *QueryStatsRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_QueryStatsRequest.Unmarshal(m, b)
+}
+func (m *QueryStatsRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_QueryStatsRequest.Marshal(b, m, deterministic)
+}
+func (dst *QueryStatsRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_QueryStatsRequest.Merge(dst, src)
+}
+func (m *QueryStatsRequest) XXX_Size() int {
+	return xxx_messageInfo_QueryStatsRequest.Size(m)
+}
+func (m *QueryStatsRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_QueryStatsRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_QueryStatsRequest proto.InternalMessageInfo
+
+func (m *QueryStatsRequest) GetPattern() string {
+	if m != nil {
+		return m.Pattern
+	}
+	return ""
+}
+
+func (m *QueryStatsRequest) GetReset_() bool {
+	if m != nil {
+		return m.Reset_
+	}
+	return false
+}
+
+type QueryStatsResponse struct {
+	Stat                 []*Stat  `protobuf:"bytes,1,rep,name=stat,proto3" json:"stat,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *QueryStatsResponse) Reset()         { *m = QueryStatsResponse{} }
+func (m *QueryStatsResponse) String() string { return proto.CompactTextString(m) }
+func (*QueryStatsResponse) ProtoMessage()    {}
+func (*QueryStatsResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_command_d2105e779ee1253c, []int{4}
+}
+func (m *QueryStatsResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_QueryStatsResponse.Unmarshal(m, b)
+}
+func (m *QueryStatsResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_QueryStatsResponse.Marshal(b, m, deterministic)
+}
+func (dst *QueryStatsResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_QueryStatsResponse.Merge(dst, src)
+}
+func (m *QueryStatsResponse) XXX_Size() int {
+	return xxx_messageInfo_QueryStatsResponse.Size(m)
+}
+func (m *QueryStatsResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_QueryStatsResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_QueryStatsResponse proto.InternalMessageInfo
+
+func (m *QueryStatsResponse) GetStat() []*Stat {
+	if m != nil {
+		return m.Stat
+	}
+	return nil
+}
+
 type Config struct {
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
@@ -163,7 +246,7 @@ func (m *Config) Reset()         { *m = Config{} }
 func (m *Config) String() string { return proto.CompactTextString(m) }
 func (*Config) ProtoMessage()    {}
 func (*Config) Descriptor() ([]byte, []int) {
-	return fileDescriptor_command_a956deb495595f76, []int{3}
+	return fileDescriptor_command_d2105e779ee1253c, []int{5}
 }
 func (m *Config) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Config.Unmarshal(m, b)
@@ -187,6 +270,8 @@ func init() {
 	proto.RegisterType((*GetStatsRequest)(nil), "v2ray.core.app.stats.command.GetStatsRequest")
 	proto.RegisterType((*Stat)(nil), "v2ray.core.app.stats.command.Stat")
 	proto.RegisterType((*GetStatsResponse)(nil), "v2ray.core.app.stats.command.GetStatsResponse")
+	proto.RegisterType((*QueryStatsRequest)(nil), "v2ray.core.app.stats.command.QueryStatsRequest")
+	proto.RegisterType((*QueryStatsResponse)(nil), "v2ray.core.app.stats.command.QueryStatsResponse")
 	proto.RegisterType((*Config)(nil), "v2ray.core.app.stats.command.Config")
 }
 
@@ -203,6 +288,7 @@ const _ = grpc.SupportPackageIsVersion4
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
 type StatsServiceClient interface {
 	GetStats(ctx context.Context, in *GetStatsRequest, opts ...grpc.CallOption) (*GetStatsResponse, error)
+	QueryStats(ctx context.Context, in *QueryStatsRequest, opts ...grpc.CallOption) (*QueryStatsResponse, error)
 }
 
 type statsServiceClient struct {
@@ -222,9 +308,19 @@ func (c *statsServiceClient) GetStats(ctx context.Context, in *GetStatsRequest,
 	return out, nil
 }
 
+func (c *statsServiceClient) QueryStats(ctx context.Context, in *QueryStatsRequest, opts ...grpc.CallOption) (*QueryStatsResponse, error) {
+	out := new(QueryStatsResponse)
+	err := c.cc.Invoke(ctx, "/v2ray.core.app.stats.command.StatsService/QueryStats", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // StatsServiceServer is the server API for StatsService service.
 type StatsServiceServer interface {
 	GetStats(context.Context, *GetStatsRequest) (*GetStatsResponse, error)
+	QueryStats(context.Context, *QueryStatsRequest) (*QueryStatsResponse, error)
 }
 
 func RegisterStatsServiceServer(s *grpc.Server, srv StatsServiceServer) {
@@ -249,6 +345,24 @@ func _StatsService_GetStats_Handler(srv interface{}, ctx context.Context, dec fu
 	return interceptor(ctx, in, info, handler)
 }
 
+func _StatsService_QueryStats_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(QueryStatsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(StatsServiceServer).QueryStats(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/v2ray.core.app.stats.command.StatsService/QueryStats",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(StatsServiceServer).QueryStats(ctx, req.(*QueryStatsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _StatsService_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "v2ray.core.app.stats.command.StatsService",
 	HandlerType: (*StatsServiceServer)(nil),
@@ -257,32 +371,40 @@ var _StatsService_serviceDesc = grpc.ServiceDesc{
 			MethodName: "GetStats",
 			Handler:    _StatsService_GetStats_Handler,
 		},
+		{
+			MethodName: "QueryStats",
+			Handler:    _StatsService_QueryStats_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "v2ray.com/core/app/stats/command/command.proto",
 }
 
 func init() {
-	proto.RegisterFile("v2ray.com/core/app/stats/command/command.proto", fileDescriptor_command_a956deb495595f76)
-}
-
-var fileDescriptor_command_a956deb495595f76 = []byte{
-	// 267 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x91, 0x3f, 0x4b, 0x03, 0x31,
-	0x14, 0xc0, 0xbd, 0x5a, 0xeb, 0xf9, 0x14, 0x94, 0xe0, 0x50, 0xa4, 0xc3, 0x91, 0xa9, 0x8b, 0xef,
-	0xe4, 0x04, 0x17, 0x27, 0xbd, 0x41, 0x10, 0x07, 0x49, 0xc1, 0xc1, 0x2d, 0xc6, 0xa7, 0x14, 0xcd,
-	0x25, 0x26, 0xe9, 0x41, 0xf1, 0x1b, 0xf9, 0x29, 0x25, 0xb9, 0x1e, 0x82, 0xe0, 0xe1, 0x94, 0xf7,
-	0x92, 0xdf, 0xef, 0xfd, 0x21, 0x80, 0x6d, 0xe5, 0xe4, 0x1a, 0x95, 0xd1, 0xa5, 0x32, 0x8e, 0x4a,
-	0x69, 0x6d, 0xe9, 0x83, 0x0c, 0xbe, 0x54, 0x46, 0x6b, 0xd9, 0x3c, 0xf7, 0x27, 0x5a, 0x67, 0x82,
-	0x61, 0xb3, 0x9e, 0x77, 0x84, 0xd2, 0x5a, 0x4c, 0x2c, 0x6e, 0x18, 0x7e, 0x09, 0x87, 0x37, 0x14,
-	0x16, 0xf1, 0x4e, 0xd0, 0xc7, 0x8a, 0x7c, 0x60, 0x0c, 0xc6, 0x8d, 0xd4, 0x34, 0xcd, 0x8a, 0x6c,
-	0xbe, 0x27, 0x52, 0xcc, 0x8e, 0x61, 0xc7, 0x91, 0xa7, 0x30, 0x1d, 0x15, 0xd9, 0x3c, 0x17, 0x5d,
-	0xc2, 0xcf, 0x60, 0x1c, 0xcd, 0xbf, 0x8c, 0x56, 0xbe, 0xaf, 0x28, 0x19, 0xdb, 0xa2, 0x4b, 0xf8,
-	0x2d, 0x1c, 0xfd, 0xb4, 0xf3, 0xd6, 0x34, 0x9e, 0xd8, 0x05, 0x8c, 0xe3, 0x4c, 0xc9, 0xde, 0xaf,
-	0x38, 0x0e, 0xcd, 0x8b, 0x51, 0x15, 0x89, 0xe7, 0x39, 0x4c, 0x6a, 0xd3, 0xbc, 0x2c, 0x5f, 0xab,
-	0x4f, 0x38, 0x48, 0x25, 0x17, 0xe4, 0xda, 0xa5, 0x22, 0xf6, 0x06, 0x79, 0xdf, 0x85, 0x9d, 0x0e,
-	0xd7, 0xfb, 0xb5, 0xfc, 0x09, 0xfe, 0x17, 0xef, 0x86, 0xe7, 0x5b, 0xd7, 0x77, 0x50, 0x28, 0xa3,
-	0x07, 0xb5, 0xfb, 0xec, 0x71, 0x77, 0x13, 0x7e, 0x8d, 0x66, 0x0f, 0x95, 0x90, 0x6b, 0xac, 0x23,
-	0x79, 0x65, 0x6d, 0xda, 0xc8, 0x63, 0xdd, 0x3d, 0x3f, 0x4d, 0xd2, 0xa7, 0x9d, 0x7f, 0x07, 0x00,
-	0x00, 0xff, 0xff, 0x10, 0x3a, 0x8a, 0xf3, 0xe6, 0x01, 0x00, 0x00,
+	proto.RegisterFile("v2ray.com/core/app/stats/command/command.proto", fileDescriptor_command_d2105e779ee1253c)
+}
+
+var fileDescriptor_command_d2105e779ee1253c = []byte{
+	// 321 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x92, 0xb1, 0x4e, 0xc3, 0x30,
+	0x10, 0x86, 0x49, 0x5b, 0xda, 0x72, 0x20, 0x01, 0x16, 0x43, 0x55, 0x75, 0x88, 0x3c, 0x75, 0xc1,
+	0xa9, 0x82, 0xc4, 0xc2, 0x04, 0x19, 0x90, 0x50, 0x07, 0x70, 0x25, 0x06, 0x36, 0x13, 0x0e, 0x54,
+	0x41, 0x62, 0xd7, 0x76, 0x22, 0xe5, 0x95, 0x78, 0x38, 0x9e, 0x01, 0xc5, 0x49, 0x54, 0xa0, 0x6a,
+	0x54, 0xa6, 0xdc, 0xc5, 0xff, 0x77, 0xf7, 0xdf, 0xd9, 0xc0, 0xf2, 0x50, 0x8b, 0x82, 0xc5, 0x32,
+	0x09, 0x62, 0xa9, 0x31, 0x10, 0x4a, 0x05, 0xc6, 0x0a, 0x6b, 0x82, 0x58, 0x26, 0x89, 0x48, 0x5f,
+	0x9a, 0x2f, 0x53, 0x5a, 0x5a, 0x49, 0x26, 0x8d, 0x5e, 0x23, 0x13, 0x4a, 0x31, 0xa7, 0x65, 0xb5,
+	0x86, 0x5e, 0xc1, 0xf1, 0x2d, 0xda, 0x45, 0xf9, 0x8f, 0xe3, 0x2a, 0x43, 0x63, 0x09, 0x81, 0x5e,
+	0x2a, 0x12, 0x1c, 0x79, 0xbe, 0x37, 0x3d, 0xe0, 0x2e, 0x26, 0x67, 0xb0, 0xaf, 0xd1, 0xa0, 0x1d,
+	0x75, 0x7c, 0x6f, 0x3a, 0xe4, 0x55, 0x42, 0x67, 0xd0, 0x2b, 0xc9, 0x6d, 0x44, 0x2e, 0x3e, 0x32,
+	0x74, 0x44, 0x97, 0x57, 0x09, 0xbd, 0x83, 0x93, 0x75, 0x3b, 0xa3, 0x64, 0x6a, 0x90, 0x5c, 0x42,
+	0xaf, 0xf4, 0xe4, 0xe8, 0xc3, 0x90, 0xb2, 0x36, 0xbf, 0xac, 0x44, 0xb9, 0xd3, 0xd3, 0x08, 0x4e,
+	0x1f, 0x32, 0xd4, 0xc5, 0x2f, 0xf3, 0x23, 0x18, 0x28, 0x61, 0x2d, 0xea, 0xb4, 0x76, 0xd3, 0xa4,
+	0x5b, 0x46, 0x98, 0x03, 0xf9, 0x59, 0x64, 0xc3, 0x52, 0xf7, 0x5f, 0x96, 0x86, 0xd0, 0x8f, 0x64,
+	0xfa, 0xba, 0x7c, 0x0b, 0xbf, 0x3c, 0x38, 0x72, 0x35, 0x17, 0xa8, 0xf3, 0x65, 0x8c, 0xe4, 0x1d,
+	0x86, 0xcd, 0xe4, 0xe4, 0xbc, 0xbd, 0xe0, 0x9f, 0x0b, 0x19, 0xb3, 0x5d, 0xe5, 0x95, 0x7b, 0xba,
+	0x47, 0x56, 0x00, 0xeb, 0xa9, 0x48, 0xd0, 0xce, 0x6f, 0x2c, 0x71, 0x3c, 0xdb, 0x1d, 0x68, 0x5a,
+	0xde, 0xcc, 0xc1, 0x8f, 0x65, 0xd2, 0x0a, 0xde, 0x7b, 0x4f, 0x83, 0x3a, 0xfc, 0xec, 0x4c, 0x1e,
+	0x43, 0x2e, 0x0a, 0x16, 0x95, 0xca, 0x6b, 0xa5, 0xdc, 0x16, 0x0d, 0x8b, 0xaa, 0xe3, 0xe7, 0xbe,
+	0x7b, 0xbb, 0x17, 0xdf, 0x01, 0x00, 0x00, 0xff, 0xff, 0xcc, 0x9e, 0xb8, 0xeb, 0xed, 0x02, 0x00,
+	0x00,
 }

app/stats/command/command.proto

@@ -22,8 +22,18 @@ message GetStatsResponse {
   Stat stat = 1;
 }
 
+message QueryStatsRequest {
+  string pattern = 1;
+  bool reset = 2;
+}
+
+message QueryStatsResponse {
+  repeated Stat stat = 1;
+}
+
 service StatsService {
   rpc GetStats(GetStatsRequest) returns (GetStatsResponse) {}
+  rpc QueryStats(QueryStatsRequest) returns (QueryStatsResponse) {}
 }
 
 message Config {}

app/stats/command/command_test.go

@@ -0,0 +1,102 @@
+package command_test
+
+import (
+	"testing"
+
+	context "golang.org/x/net/context"
+	"v2ray.com/core/app/stats"
+	. "v2ray.com/core/app/stats/command"
+	. "v2ray.com/ext/assert"
+)
+
+func TestGetStats(t *testing.T) {
+	assert := With(t)
+
+	m, err := stats.NewManager(context.Background(), &stats.Config{})
+	assert(err, IsNil)
+
+	sc, err := m.RegisterCounter("test_counter")
+	assert(err, IsNil)
+
+	sc.Set(1)
+
+	s := NewStatsServer(m)
+
+	testCases := []struct {
+		name  string
+		reset bool
+		value int64
+		err   bool
+	}{
+		{
+			name: "counterNotExist",
+			err:  true,
+		},
+		{
+			name:  "test_counter",
+			reset: true,
+			value: 1,
+		},
+		{
+			name:  "test_counter",
+			value: 0,
+		},
+	}
+	for _, tc := range testCases {
+		resp, err := s.GetStats(context.Background(), &GetStatsRequest{
+			Name:   tc.name,
+			Reset_: tc.reset,
+		})
+		if tc.err {
+			assert(err, IsNotNil)
+		} else {
+			assert(err, IsNil)
+			assert(resp.Stat.Name, Equals, tc.name)
+			assert(resp.Stat.Value, Equals, tc.value)
+		}
+	}
+}
+
+func TestQueryStats(t *testing.T) {
+	assert := With(t)
+
+	m, err := stats.NewManager(context.Background(), &stats.Config{})
+	assert(err, IsNil)
+
+	sc1, err := m.RegisterCounter("test_counter")
+	assert(err, IsNil)
+	sc1.Set(1)
+
+	sc2, err := m.RegisterCounter("test_counter_2")
+	assert(err, IsNil)
+	sc2.Set(2)
+
+	sc3, err := m.RegisterCounter("test_counter_3")
+	assert(err, IsNil)
+	sc3.Set(3)
+
+	s := NewStatsServer(m)
+	resp, err := s.QueryStats(context.Background(), &QueryStatsRequest{
+		Pattern: "counter_",
+	})
+	assert(err, IsNil)
+	assert(len(resp.Stat), Equals, 2)
+
+	v2 := false
+	v3 := false
+	for _, sc := range resp.Stat {
+		switch sc.Name {
+		case "test_counter_2":
+			assert(sc.Value, Equals, int64(2))
+			v2 = true
+		case "test_counter_3":
+			assert(sc.Value, Equals, int64(3))
+			v3 = true
+		default:
+			t.Error("unexpected stat name: ", sc.Name)
+			t.Fail()
+		}
+	}
+	assert(v2, IsTrue)
+	assert(v3, IsTrue)
+}

app/stats/stats.go

@@ -74,6 +74,17 @@ func (m *Manager) GetCounter(name string) core.StatCounter {
 	return nil
 }
 
+func (m *Manager) Visit(visitor func(string, core.StatCounter) bool) {
+	m.access.RLock()
+	defer m.access.RUnlock()
+
+	for name, c := range m.counters {
+		if !visitor(name, c) {
+			break
+		}
+	}
+}
+
 // Start implements common.Runnable.
 func (m *Manager) Start() error {
 	return nil