Merge pull request #1656 from micro/client-cache

Client Cache

auth/service/service.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"sort"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/micro/go-micro/v2/auth"
@@ -23,9 +22,6 @@ type svc struct {
 	auth    pb.AuthService
 	rule    pb.RulesService
 	jwt     token.Provider
-
-	rules []*pb.Rule
-	sync.Mutex
 }
 
 func (s *svc) String() string {
@@ -53,8 +49,6 @@ func (s *svc) Init(opts ...auth.Option) {
 }
 
 func (s *svc) Options() auth.Options {
-	s.Lock()
-	defer s.Unlock()
 	return s.options
 }
 
@@ -110,9 +104,6 @@ func (s *svc) Revoke(role string, res *auth.Resource) error {
 
 // Verify an account has access to a resource
 func (s *svc) Verify(acc *auth.Account, res *auth.Resource) error {
-	// load the rules if none are loaded
-	s.loadRulesIfEmpty()
-
 	// set the namespace on the resource
 	if len(res.Namespace) == 0 {
 		res.Namespace = s.Options().Namespace
@@ -230,11 +221,14 @@ func accessForRule(rule *pb.Rule, acc *auth.Account, res *auth.Resource) pb.Acce
 // listRules gets all the rules from the store which match the filters.
 // filters are namespace, type, name and then endpoint.
 func (s *svc) listRules(filters ...string) []*pb.Rule {
-	s.Lock()
+	// load rules using the client cache
-	defer s.Unlock()
+	allRules, err := s.loadRules()
+	if err != nil {
+		return []*pb.Rule{}
+	}
 
 	var rules []*pb.Rule
-	for _, r := range s.rules {
+	for _, r := range allRules {
 		if len(filters) > 0 && r.Resource.Namespace != filters[0] {
 			continue
 		}
@@ -260,27 +254,15 @@ func (s *svc) listRules(filters ...string) []*pb.Rule {
 }
 
 // loadRules retrieves the rules from the auth service
-func (s *svc) loadRules() {
+func (s *svc) loadRules() ([]*pb.Rule, error) {
-	rsp, err := s.rule.List(context.TODO(), &pb.ListRequest{})
+	rsp, err := s.rule.List(context.TODO(), &pb.ListRequest{}, client.WithCache(time.Minute))
-	s.Lock()
-	defer s.Unlock()
 
 	if err != nil {
-		log.Errorf("Error listing rules: %v", err)
+		log.Debugf("Error listing rules: %v", err)
-		return
+		return nil, err
 	}
 
-	s.rules = rsp.Rules
+	return rsp.Rules, nil
-}
-
-func (s *svc) loadRulesIfEmpty() {
-	s.Lock()
-	rules := s.rules
-	s.Unlock()
-
-	if len(rules) == 0 {
-		s.loadRules()
-	}
 }
 
 func serializeToken(t *pb.Token) *auth.Token {

auth/service/sevice_test.go

@@ -1,26 +0,0 @@
-package service
-
-import (
-	"testing"
-
-	pb "github.com/micro/go-micro/v2/auth/service/proto"
-)
-
-func TestListRulesSorting(t *testing.T) {
-	s := &svc{
-		rules: []*pb.Rule{
-			&pb.Rule{Priority: 1},
-			&pb.Rule{Priority: 3},
-			&pb.Rule{Priority: 2},
-		},
-	}
-
-	var priorities []int32
-	for _, r := range s.listRules() {
-		priorities = append(priorities, r.Priority)
-	}
-
-	if priorities[0] != 1 || priorities[1] != 2 || priorities[2] != 3 {
-		t.Errorf("Incorrect Rule Sequence")
-	}
-}

client/cache.go

@@ -0,0 +1,66 @@
+package client
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"hash/fnv"
+	"time"
+
+	"github.com/micro/go-micro/v2/metadata"
+	cache "github.com/patrickmn/go-cache"
+)
+
+// NewCache returns an initialised cache.
+func NewCache() *Cache {
+	return &Cache{
+		cache: cache.New(cache.NoExpiration, 30*time.Second),
+	}
+}
+
+// Cache for responses
+type Cache struct {
+	cache *cache.Cache
+}
+
+// Get a response from the cache
+func (c *Cache) Get(ctx context.Context, req *Request) (interface{}, bool) {
+	return c.cache.Get(key(ctx, req))
+}
+
+// Set a response in the cache
+func (c *Cache) Set(ctx context.Context, req *Request, rsp interface{}, expiry time.Duration) {
+	c.cache.Set(key(ctx, req), rsp, expiry)
+}
+
+// List the key value pairs in the cache
+func (c *Cache) List() map[string]string {
+	items := c.cache.Items()
+
+	rsp := make(map[string]string, len(items))
+	for k, v := range items {
+		bytes, _ := json.Marshal(v.Object)
+		rsp[k] = string(bytes)
+	}
+
+	return rsp
+}
+
+// key returns a hash for the context and request
+func key(ctx context.Context, req *Request) string {
+	md, _ := metadata.FromContext(ctx)
+
+	bytes, _ := json.Marshal(map[string]interface{}{
+		"metadata": md,
+		"request": map[string]interface{}{
+			"service":  (*req).Service(),
+			"endpoint": (*req).Endpoint(),
+			"method":   (*req).Method(),
+			"body":     (*req).Body(),
+		},
+	})
+
+	h := fnv.New64()
+	h.Write(bytes)
+	return fmt.Sprintf("%x", h.Sum(nil))
+}

client/cache_test.go

@@ -0,0 +1,76 @@
+package client
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/micro/go-micro/v2/metadata"
+)
+
+func TestCache(t *testing.T) {
+	ctx := context.TODO()
+	req := NewRequest("go.micro.service.foo", "Foo.Bar", nil)
+
+	t.Run("CacheMiss", func(t *testing.T) {
+		if _, ok := NewCache().Get(ctx, &req); ok {
+			t.Errorf("Expected to get no result from Get")
+		}
+	})
+
+	t.Run("CacheHit", func(t *testing.T) {
+		c := NewCache()
+
+		rsp := "theresponse"
+		c.Set(ctx, &req, rsp, time.Minute)
+
+		if res, ok := c.Get(ctx, &req); !ok {
+			t.Errorf("Expected a result, got nothing")
+		} else if res != rsp {
+			t.Errorf("Expected '%v' result, got '%v'", rsp, res)
+		}
+	})
+}
+
+func TestCacheKey(t *testing.T) {
+	ctx := context.TODO()
+	req1 := NewRequest("go.micro.service.foo", "Foo.Bar", nil)
+	req2 := NewRequest("go.micro.service.foo", "Foo.Baz", nil)
+	req3 := NewRequest("go.micro.service.foo", "Foo.Baz", "customquery")
+
+	t.Run("IdenticalRequests", func(t *testing.T) {
+		key1 := key(ctx, &req1)
+		key2 := key(ctx, &req1)
+		if key1 != key2 {
+			t.Errorf("Expected the keys to match for identical requests and context")
+		}
+	})
+
+	t.Run("DifferentRequestEndpoints", func(t *testing.T) {
+		key1 := key(ctx, &req1)
+		key2 := key(ctx, &req2)
+
+		if key1 == key2 {
+			t.Errorf("Expected the keys to differ for different request endpoints")
+		}
+	})
+
+	t.Run("DifferentRequestBody", func(t *testing.T) {
+		key1 := key(ctx, &req2)
+		key2 := key(ctx, &req3)
+
+		if key1 == key2 {
+			t.Errorf("Expected the keys to differ for different request bodies")
+		}
+	})
+
+	t.Run("DifferentMetadata", func(t *testing.T) {
+		mdCtx := metadata.Set(context.TODO(), "foo", "bar")
+		key1 := key(mdCtx, &req1)
+		key2 := key(ctx, &req1)
+
+		if key1 == key2 {
+			t.Errorf("Expected the keys to differ for different metadata")
+		}
+	})
+}

client/options.go

@@ -29,6 +29,9 @@ type Options struct {
 	PoolSize int
 	PoolTTL  time.Duration
 
+	// Response cache
+	Cache *Cache
+
 	// Middleware for client
 	Wrappers []Wrapper
 
@@ -59,6 +62,8 @@ type CallOptions struct {
 	StreamTimeout time.Duration
 	// Use the services own auth token
 	ServiceToken bool
+	// Duration to cache the response for
+	CacheExpiry time.Duration
 
 	// Middleware for low level call func
 	CallWrappers []CallWrapper
@@ -91,6 +96,7 @@ type RequestOptions struct {
 
 func NewOptions(options ...Option) Options {
 	opts := Options{
+		Cache:       NewCache(),
 		Context:     context.Background(),
 		ContentType: DefaultContentType,
 		Codecs:      make(map[string]codec.NewCodec),
@@ -324,6 +330,14 @@ func WithServiceToken() CallOption {
 	}
 }
 
+// WithCache is a CallOption which sets the duration the response
+// shoull be cached for
+func WithCache(c time.Duration) CallOption {
+	return func(o *CallOptions) {
+		o.CacheExpiry = c
+	}
+}
+
 func WithMessageContentType(ct string) MessageOption {
 	return func(o *MessageOptions) {
 		o.ContentType = ct

config/cmd/cmd.go

@@ -471,9 +471,13 @@ func (c *cmd) Before(ctx *cli.Context) error {
 	var serverOpts []server.Option
 	var clientOpts []client.Option
 
-	// setup a client to use when calling the runtime
+	// setup a client to use when calling the runtime. It is important the auth client is wrapped
+	// after the cache client since the wrappers are applied in reverse order and the cache will use
+	// some of the headers set by the auth client.
 	authFn := func() auth.Auth { return *c.opts.Auth }
-	microClient := wrapper.AuthClient(authFn, grpc.NewClient())
+	cacheFn := func() *client.Cache { return (*c.opts.Client).Options().Cache }
+	microClient := wrapper.CacheClient(cacheFn, grpc.NewClient())
+	microClient = wrapper.AuthClient(authFn, microClient)
 
 	// Set the store
 	if name := ctx.String("store"); len(name) > 0 {

debug/service/handler/debug.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"time"
 
+	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/debug/log"
 	proto "github.com/micro/go-micro/v2/debug/service/proto"
 	"github.com/micro/go-micro/v2/debug/stats"
@@ -13,11 +14,12 @@ import (
 )
 
 // NewHandler returns an instance of the Debug Handler
-func NewHandler() *Debug {
+func NewHandler(c client.Client) *Debug {
 	return &Debug{
 		log:   log.DefaultLog,
 		stats: stats.DefaultStats,
 		trace: trace.DefaultTracer,
+		cache: c.Options().Cache,
 	}
 }
 
@@ -30,6 +32,8 @@ type Debug struct {
 	stats stats.Stats
 	// the tracer
 	trace trace.Tracer
+	// the cache
+	cache *client.Cache
 }
 
 func (d *Debug) Health(ctx context.Context, req *proto.HealthRequest, rsp *proto.HealthResponse) error {
@@ -164,3 +168,9 @@ func (d *Debug) Log(ctx context.Context, stream server.Stream) error {
 
 	return nil
 }
+
+// Cache returns all the key value pairs in the client cache
+func (d *Debug) Cache(ctx context.Context, req *proto.CacheRequest, rsp *proto.CacheResponse) error {
+	rsp.Values = d.cache.List()
+	return nil
+}

debug/service/proto/debug.pb.go

@@ -582,6 +582,76 @@ func (m *Span) GetType() SpanType {
 	return SpanType_INBOUND
 }
 
+type CacheRequest struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *CacheRequest) Reset()         { *m = CacheRequest{} }
+func (m *CacheRequest) String() string { return proto.CompactTextString(m) }
+func (*CacheRequest) ProtoMessage()    {}
+func (*CacheRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_df91f41a5db378e6, []int{9}
+}
+
+func (m *CacheRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CacheRequest.Unmarshal(m, b)
+}
+func (m *CacheRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CacheRequest.Marshal(b, m, deterministic)
+}
+func (m *CacheRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CacheRequest.Merge(m, src)
+}
+func (m *CacheRequest) XXX_Size() int {
+	return xxx_messageInfo_CacheRequest.Size(m)
+}
+func (m *CacheRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_CacheRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CacheRequest proto.InternalMessageInfo
+
+type CacheResponse struct {
+	Values               map[string]string `protobuf:"bytes,1,rep,name=values,proto3" json:"values,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *CacheResponse) Reset()         { *m = CacheResponse{} }
+func (m *CacheResponse) String() string { return proto.CompactTextString(m) }
+func (*CacheResponse) ProtoMessage()    {}
+func (*CacheResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_df91f41a5db378e6, []int{10}
+}
+
+func (m *CacheResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CacheResponse.Unmarshal(m, b)
+}
+func (m *CacheResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CacheResponse.Marshal(b, m, deterministic)
+}
+func (m *CacheResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CacheResponse.Merge(m, src)
+}
+func (m *CacheResponse) XXX_Size() int {
+	return xxx_messageInfo_CacheResponse.Size(m)
+}
+func (m *CacheResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_CacheResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CacheResponse proto.InternalMessageInfo
+
+func (m *CacheResponse) GetValues() map[string]string {
+	if m != nil {
+		return m.Values
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterEnum("SpanType", SpanType_name, SpanType_value)
 	proto.RegisterType((*HealthRequest)(nil), "HealthRequest")
@@ -595,50 +665,56 @@ func init() {
 	proto.RegisterType((*TraceResponse)(nil), "TraceResponse")
 	proto.RegisterType((*Span)(nil), "Span")
 	proto.RegisterMapType((map[string]string)(nil), "Span.MetadataEntry")
+	proto.RegisterType((*CacheRequest)(nil), "CacheRequest")
+	proto.RegisterType((*CacheResponse)(nil), "CacheResponse")
+	proto.RegisterMapType((map[string]string)(nil), "CacheResponse.ValuesEntry")
 }
 
 func init() { proto.RegisterFile("debug/service/proto/debug.proto", fileDescriptor_df91f41a5db378e6) }
 
 var fileDescriptor_df91f41a5db378e6 = []byte{
-	// 594 bytes of a gzipped FileDescriptorProto
+	// 646 bytes of a gzipped FileDescriptorProto
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+	0x72, 0x25, 0x53, 0x93, 0x97, 0x4c, 0x08, 0xba, 0x36, 0xb6, 0x86, 0xa4, 0x83, 0xe9, 0x0b, 0x88,
-	0xbc, 0x6f, 0xb8, 0xb6, 0x03, 0xaa, 0xa3, 0x6a, 0xf7, 0x8a, 0x5d, 0xf6, 0xa8, 0x67, 0x0b, 0xa9,
+	0x06, 0x8f, 0xd0, 0x0e, 0x78, 0x1f, 0xd9, 0xd6, 0x2e, 0xa8, 0x3e, 0xd5, 0xb8, 0x97, 0xf4, 0xa2,
-	0x01, 0xef, 0xdc, 0xb7, 0x4e, 0xfa, 0x04, 0xb6, 0x4f, 0x39, 0xcb, 0x71, 0x30, 0x28, 0x02, 0xb7,
+	0x65, 0x7a, 0xb7, 0x90, 0x18, 0xf0, 0xdc, 0x7d, 0xea, 0x64, 0x77, 0x60, 0x7e, 0xc2, 0x69, 0xce,
-	0x2a, 0xec, 0x53, 0xb7, 0x2a, 0xd2, 0x97, 0xb0, 0xb0, 0xf7, 0x36, 0x15, 0x0f, 0xc1, 0x17, 0x1d,
+	0x3a, 0x83, 0x62, 0x70, 0x37, 0x85, 0x7d, 0xea, 0x6e, 0x8a, 0xec, 0x21, 0x44, 0xb6, 0x6e, 0x53,
-	0x6b, 0x54, 0xd0, 0x54, 0xdf, 0x7e, 0x76, 0xd2, 0xb1, 0x86, 0x1a, 0x2e, 0xfd, 0xe1, 0xc2, 0x54,
+	0xf1, 0x3f, 0xf8, 0xa2, 0xa1, 0x95, 0x0a, 0x9a, 0x9a, 0xdb, 0xc7, 0xc7, 0x0d, 0xad, 0x88, 0xe1,
-	0x61, 0xf5, 0x83, 0x52, 0x3d, 0xb3, 0x4a, 0x06, 0x58, 0x71, 0x77, 0x10, 0x57, 0x9e, 0x77, 0x8c,
+	0xb2, 0x2f, 0x2e, 0x8c, 0x15, 0x56, 0x3f, 0x28, 0xd5, 0x33, 0xdb, 0xc9, 0x00, 0xdb, 0xdc, 0xed,
-	0xa3, 0x35, 0x37, 0xa4, 0x16, 0x11, 0x02, 0xd3, 0x86, 0xd5, 0xc6, 0xdc, 0x90, 0xea, 0xf3, 0x66,
+	0x9a, 0x2b, 0xcf, 0x1b, 0xca, 0x99, 0x35, 0x37, 0x24, 0x16, 0x21, 0x04, 0xe3, 0x8a, 0x96, 0xc6,
-	0xde, 0xfc, 0x71, 0xde, 0x12, 0x08, 0x8a, 0x9e, 0x33, 0x59, 0xb5, 0x8d, 0xcd, 0xca, 0x35, 0x26,
+	0xdc, 0x90, 0xe8, 0xef, 0x7e, 0xde, 0xfc, 0x61, 0xde, 0x52, 0x08, 0x8a, 0x96, 0x53, 0xb9, 0xa9,
-	0xab, 0x0d, 0xa3, 0xe7, 0xba, 0xe1, 0xbb, 0xba, 0xe1, 0x7f, 0xda, 0xfc, 0x18, 0xa6, 0x72, 0xdd,
+	0x2b, 0x9b, 0x95, 0x2b, 0x8c, 0x96, 0x3d, 0xa3, 0xa7, 0x7a, 0xe0, 0xbf, 0xf5, 0xc0, 0xbf, 0xb4,
-	0xa1, 0x0e, 0x51, 0xb4, 0x1f, 0xea, 0xe2, 0xd3, 0x75, 0x87, 0x54, 0xd3, 0xff, 0xe5, 0xf5, 0xf3,
+	0xf9, 0x36, 0x8c, 0xe5, 0xb6, 0x61, 0x3a, 0x44, 0xf1, 0x2a, 0xd4, 0xe2, 0x93, 0x6d, 0xc3, 0x88,
-	0xa7, 0x10, 0x0c, 0x72, 0x64, 0x0b, 0xe6, 0x9f, 0x8f, 0x3e, 0x1c, 0x9f, 0x1d, 0x1d, 0xec, 0x4c,
+	0xa6, 0xff, 0xcc, 0xeb, 0x18, 0xe6, 0xaf, 0x68, 0x7e, 0xde, 0x79, 0x9d, 0x7d, 0x86, 0xc8, 0x62,
-	0xc8, 0x36, 0x04, 0xc7, 0x67, 0xa7, 0x06, 0x39, 0xfb, 0x3f, 0x1d, 0xf0, 0x0f, 0xd4, 0x62, 0x20,
+	0xeb, 0xed, 0x0a, 0x26, 0x5a, 0xdd, 0x99, 0x9b, 0xe2, 0x41, 0x1d, 0xbf, 0xd7, 0x45, 0x33, 0xb2,
-	0xbb, 0xe0, 0x1d, 0xb6, 0x25, 0xd9, 0xca, 0x6e, 0x12, 0x9c, 0xcc, 0x6d, 0x50, 0xd2, 0xc9, 0x2b,
+	0x55, 0xa6, 0xcf, 0x60, 0xd6, 0xa3, 0x7f, 0x67, 0x9e, 0xfb, 0x77, 0x21, 0xe8, 0xd6, 0x43, 0x33,
-	0x87, 0xbc, 0x80, 0x99, 0x59, 0x04, 0x24, 0xca, 0x46, 0xcb, 0x23, 0xb9, 0x93, 0x8d, 0x37, 0x44,
+	0x98, 0xbe, 0x3d, 0x7c, 0x79, 0x74, 0x7a, 0xb8, 0xbf, 0x33, 0x42, 0x73, 0x08, 0x8e, 0x4e, 0x4f,
-	0x3a, 0x21, 0x4b, 0xf0, 0xf5, 0x07, 0x4e, 0x16, 0xd9, 0xe6, 0x4e, 0x48, 0xa2, 0x6c, 0xf4, 0xdd,
+	0x0c, 0x72, 0x56, 0xdf, 0x1c, 0xf0, 0xf7, 0xd5, 0xa1, 0x42, 0xbb, 0xe0, 0x1d, 0xd4, 0x6b, 0x34,
-	0x9b, 0x4a, 0xfd, 0xa7, 0x93, 0x45, 0xb6, 0x19, 0x8e, 0x24, 0xca, 0x46, 0x59, 0x48, 0x27, 0xe7,
+	0xc3, 0xd7, 0xff, 0xa8, 0x74, 0x6a, 0x83, 0x9b, 0x8d, 0x1e, 0x39, 0xe8, 0x01, 0x4c, 0xcc, 0x61,
-	0x33, 0xbd, 0xbb, 0xde, 0xfc, 0x09, 0x00, 0x00, 0xff, 0xff, 0x6e, 0x42, 0x7f, 0x05, 0xde, 0x04,
+	0x42, 0x31, 0x1e, 0x1c, 0xb3, 0xf4, 0x2f, 0x3c, 0xbc, 0x58, 0xd9, 0x08, 0x2d, 0xc0, 0xd7, 0x07,
-	0x00, 0x00,
+	0x07, 0x45, 0xb8, 0x7f, 0xa3, 0xd2, 0x18, 0x0f, 0xee, 0x90, 0x51, 0xea, 0x10, 0xa2, 0x08, 0xf7,
+	0xc3, 0x9a, 0xc6, 0x78, 0x90, 0x4d, 0xa3, 0xd4, 0x96, 0xa1, 0x08, 0xf7, 0xad, 0x4e, 0xe3, 0xa1,
+	0x93, 0xd9, 0xe8, 0x6c, 0xa2, 0xaf, 0xee, 0x93, 0x1f, 0x01, 0x00, 0x00, 0xff, 0xff, 0x22, 0x65,
+	0x99, 0x10, 0x98, 0x05, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -657,6 +733,7 @@ type DebugClient interface {
 	Health(ctx context.Context, in *HealthRequest, opts ...grpc.CallOption) (*HealthResponse, error)
 	Stats(ctx context.Context, in *StatsRequest, opts ...grpc.CallOption) (*StatsResponse, error)
 	Trace(ctx context.Context, in *TraceRequest, opts ...grpc.CallOption) (*TraceResponse, error)
+	Cache(ctx context.Context, in *CacheRequest, opts ...grpc.CallOption) (*CacheResponse, error)
 }
 
 type debugClient struct {
@@ -726,12 +803,22 @@ func (c *debugClient) Trace(ctx context.Context, in *TraceRequest, opts ...grpc.
 	return out, nil
 }
 
+func (c *debugClient) Cache(ctx context.Context, in *CacheRequest, opts ...grpc.CallOption) (*CacheResponse, error) {
+	out := new(CacheResponse)
+	err := c.cc.Invoke(ctx, "/Debug/Cache", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // DebugServer is the server API for Debug service.
 type DebugServer interface {
 	Log(*LogRequest, Debug_LogServer) error
 	Health(context.Context, *HealthRequest) (*HealthResponse, error)
 	Stats(context.Context, *StatsRequest) (*StatsResponse, error)
 	Trace(context.Context, *TraceRequest) (*TraceResponse, error)
+	Cache(context.Context, *CacheRequest) (*CacheResponse, error)
 }
 
 // UnimplementedDebugServer can be embedded to have forward compatible implementations.
@@ -750,6 +837,9 @@ func (*UnimplementedDebugServer) Stats(ctx context.Context, req *StatsRequest) (
 func (*UnimplementedDebugServer) Trace(ctx context.Context, req *TraceRequest) (*TraceResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Trace not implemented")
 }
+func (*UnimplementedDebugServer) Cache(ctx context.Context, req *CacheRequest) (*CacheResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Cache not implemented")
+}
 
 func RegisterDebugServer(s *grpc.Server, srv DebugServer) {
 	s.RegisterService(&_Debug_serviceDesc, srv)
@@ -830,6 +920,24 @@ func _Debug_Trace_Handler(srv interface{}, ctx context.Context, dec func(interfa
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Debug_Cache_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CacheRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DebugServer).Cache(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/Debug/Cache",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DebugServer).Cache(ctx, req.(*CacheRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Debug_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "Debug",
 	HandlerType: (*DebugServer)(nil),
@@ -846,6 +954,10 @@ var _Debug_serviceDesc = grpc.ServiceDesc{
 			MethodName: "Trace",
 			Handler:    _Debug_Trace_Handler,
 		},
+		{
+			MethodName: "Cache",
+			Handler:    _Debug_Cache_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{

debug/service/proto/debug.pb.micro.go

@@ -46,6 +46,7 @@ type DebugService interface {
 	Health(ctx context.Context, in *HealthRequest, opts ...client.CallOption) (*HealthResponse, error)
 	Stats(ctx context.Context, in *StatsRequest, opts ...client.CallOption) (*StatsResponse, error)
 	Trace(ctx context.Context, in *TraceRequest, opts ...client.CallOption) (*TraceResponse, error)
+	Cache(ctx context.Context, in *CacheRequest, opts ...client.CallOption) (*CacheResponse, error)
 }
 
 type debugService struct {
@@ -139,6 +140,16 @@ func (c *debugService) Trace(ctx context.Context, in *TraceRequest, opts ...clie
 	return out, nil
 }
 
+func (c *debugService) Cache(ctx context.Context, in *CacheRequest, opts ...client.CallOption) (*CacheResponse, error) {
+	req := c.c.NewRequest(c.name, "Debug.Cache", in)
+	out := new(CacheResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for Debug service
 
 type DebugHandler interface {
@@ -146,6 +157,7 @@ type DebugHandler interface {
 	Health(context.Context, *HealthRequest, *HealthResponse) error
 	Stats(context.Context, *StatsRequest, *StatsResponse) error
 	Trace(context.Context, *TraceRequest, *TraceResponse) error
+	Cache(context.Context, *CacheRequest, *CacheResponse) error
 }
 
 func RegisterDebugHandler(s server.Server, hdlr DebugHandler, opts ...server.HandlerOption) error {
@@ -154,6 +166,7 @@ func RegisterDebugHandler(s server.Server, hdlr DebugHandler, opts ...server.Han
 		Health(ctx context.Context, in *HealthRequest, out *HealthResponse) error
 		Stats(ctx context.Context, in *StatsRequest, out *StatsResponse) error
 		Trace(ctx context.Context, in *TraceRequest, out *TraceResponse) error
+		Cache(ctx context.Context, in *CacheRequest, out *CacheResponse) error
 	}
 	type Debug struct {
 		debug
@@ -217,3 +230,7 @@ func (h *debugHandler) Stats(ctx context.Context, in *StatsRequest, out *StatsRe
 func (h *debugHandler) Trace(ctx context.Context, in *TraceRequest, out *TraceResponse) error {
 	return h.DebugHandler.Trace(ctx, in, out)
 }
+
+func (h *debugHandler) Cache(ctx context.Context, in *CacheRequest, out *CacheResponse) error {
+	return h.DebugHandler.Cache(ctx, in, out)
+}

debug/service/proto/debug.proto

@@ -1,10 +1,11 @@
 syntax = "proto3";
 
 service Debug {
-        rpc Log(LogRequest) returns (stream Record) {};
+	rpc Log(LogRequest) returns (stream Record) {};
-        rpc Health(HealthRequest) returns (HealthResponse) {};
+	rpc Health(HealthRequest) returns (HealthResponse) {};
-        rpc Stats(StatsRequest) returns (StatsResponse) {};
+	rpc Stats(StatsRequest) returns (StatsResponse) {};
 	rpc Trace(TraceRequest) returns (TraceResponse) {};
+	rpc Cache(CacheRequest) returns (CacheResponse) {};
 }
 
 message HealthRequest {
@@ -97,3 +98,9 @@ message Span {
 	map<string,string> metadata = 7;
 	SpanType type = 8;
 }
+
+message CacheRequest {}
+
+message CacheResponse {
+	map<string, string> values = 1;
+}

server/proto/server.pb.go

@@ -1,350 +1,324 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
+// source: server/proto/server.proto
-// 	protoc-gen-go v1.22.0
-// 	protoc        v3.6.1
-// source: github.com/micro/go-micro/server/proto/server.proto
 
 package go_micro_server
 
 import (
+	context "context"
+	fmt "fmt"
 	proto "github.com/golang/protobuf/proto"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	grpc "google.golang.org/grpc"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	codes "google.golang.org/grpc/codes"
-	reflect "reflect"
+	status "google.golang.org/grpc/status"
-	sync "sync"
+	math "math"
 )
 
-const (
+// Reference imports to suppress errors if they are not otherwise used.
-	// Verify that this generated code is sufficiently up-to-date.
+var _ = proto.Marshal
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+var _ = fmt.Errorf
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
+var _ = math.Inf
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
 
-// This is a compile-time assertion that a sufficiently up-to-date version
+// This is a compile-time assertion to ensure that this generated file
-// of the legacy proto package is being used.
+// is compatible with the proto package it is being compiled against.
-const _ = proto.ProtoPackageIsVersion4
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 
 type HandleRequest struct {
-	state         protoimpl.MessageState
+	Service              string   `protobuf:"bytes,1,opt,name=service,proto3" json:"service,omitempty"`
-	sizeCache     protoimpl.SizeCache
+	Endpoint             string   `protobuf:"bytes,2,opt,name=endpoint,proto3" json:"endpoint,omitempty"`
-	unknownFields protoimpl.UnknownFields
+	Protocol             string   `protobuf:"bytes,3,opt,name=protocol,proto3" json:"protocol,omitempty"`
-
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	Service  string `protobuf:"bytes,1,opt,name=service,proto3" json:"service,omitempty"`
+	XXX_unrecognized     []byte   `json:"-"`
-	Endpoint string `protobuf:"bytes,2,opt,name=endpoint,proto3" json:"endpoint,omitempty"`
+	XXX_sizecache        int32    `json:"-"`
-	Protocol string `protobuf:"bytes,3,opt,name=protocol,proto3" json:"protocol,omitempty"`
 }
 
-func (x *HandleRequest) Reset() {
+func (m *HandleRequest) Reset()         { *m = HandleRequest{} }
-	*x = HandleRequest{}
+func (m *HandleRequest) String() string { return proto.CompactTextString(m) }
-	if protoimpl.UnsafeEnabled {
+func (*HandleRequest) ProtoMessage()    {}
-		mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *HandleRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*HandleRequest) ProtoMessage() {}
-
-func (x *HandleRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[0]
-	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 HandleRequest.ProtoReflect.Descriptor instead.
 func (*HandleRequest) Descriptor() ([]byte, []int) {
-	return file_github_com_micro_go_micro_server_proto_server_proto_rawDescGZIP(), []int{0}
+	return fileDescriptor_1959cecd4d1121a1, []int{0}
 }
 
-func (x *HandleRequest) GetService() string {
+func (m *HandleRequest) XXX_Unmarshal(b []byte) error {
-	if x != nil {
+	return xxx_messageInfo_HandleRequest.Unmarshal(m, b)
-		return x.Service
+}
+func (m *HandleRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HandleRequest.Marshal(b, m, deterministic)
+}
+func (m *HandleRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HandleRequest.Merge(m, src)
+}
+func (m *HandleRequest) XXX_Size() int {
+	return xxx_messageInfo_HandleRequest.Size(m)
+}
+func (m *HandleRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_HandleRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HandleRequest proto.InternalMessageInfo
+
+func (m *HandleRequest) GetService() string {
+	if m != nil {
+		return m.Service
 	}
 	return ""
 }
 
-func (x *HandleRequest) GetEndpoint() string {
+func (m *HandleRequest) GetEndpoint() string {
-	if x != nil {
+	if m != nil {
-		return x.Endpoint
+		return m.Endpoint
 	}
 	return ""
 }
 
-func (x *HandleRequest) GetProtocol() string {
+func (m *HandleRequest) GetProtocol() string {
-	if x != nil {
+	if m != nil {
-		return x.Protocol
+		return m.Protocol
 	}
 	return ""
 }
 
 type HandleResponse struct {
-	state         protoimpl.MessageState
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	sizeCache     protoimpl.SizeCache
+	XXX_unrecognized     []byte   `json:"-"`
-	unknownFields protoimpl.UnknownFields
+	XXX_sizecache        int32    `json:"-"`
 }
 
-func (x *HandleResponse) Reset() {
+func (m *HandleResponse) Reset()         { *m = HandleResponse{} }
-	*x = HandleResponse{}
+func (m *HandleResponse) String() string { return proto.CompactTextString(m) }
-	if protoimpl.UnsafeEnabled {
+func (*HandleResponse) ProtoMessage()    {}
-		mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *HandleResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*HandleResponse) ProtoMessage() {}
-
-func (x *HandleResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[1]
-	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 HandleResponse.ProtoReflect.Descriptor instead.
 func (*HandleResponse) Descriptor() ([]byte, []int) {
-	return file_github_com_micro_go_micro_server_proto_server_proto_rawDescGZIP(), []int{1}
+	return fileDescriptor_1959cecd4d1121a1, []int{1}
 }
 
+func (m *HandleResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HandleResponse.Unmarshal(m, b)
+}
+func (m *HandleResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HandleResponse.Marshal(b, m, deterministic)
+}
+func (m *HandleResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HandleResponse.Merge(m, src)
+}
+func (m *HandleResponse) XXX_Size() int {
+	return xxx_messageInfo_HandleResponse.Size(m)
+}
+func (m *HandleResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_HandleResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HandleResponse proto.InternalMessageInfo
+
 type SubscribeRequest struct {
-	state         protoimpl.MessageState
+	Topic                string   `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
-	sizeCache     protoimpl.SizeCache
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	unknownFields protoimpl.UnknownFields
+	XXX_unrecognized     []byte   `json:"-"`
-
+	XXX_sizecache        int32    `json:"-"`
-	Topic string `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
 }
 
-func (x *SubscribeRequest) Reset() {
+func (m *SubscribeRequest) Reset()         { *m = SubscribeRequest{} }
-	*x = SubscribeRequest{}
+func (m *SubscribeRequest) String() string { return proto.CompactTextString(m) }
-	if protoimpl.UnsafeEnabled {
+func (*SubscribeRequest) ProtoMessage()    {}
-		mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *SubscribeRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*SubscribeRequest) ProtoMessage() {}
-
-func (x *SubscribeRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[2]
-	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 SubscribeRequest.ProtoReflect.Descriptor instead.
 func (*SubscribeRequest) Descriptor() ([]byte, []int) {
-	return file_github_com_micro_go_micro_server_proto_server_proto_rawDescGZIP(), []int{2}
+	return fileDescriptor_1959cecd4d1121a1, []int{2}
 }
 
-func (x *SubscribeRequest) GetTopic() string {
+func (m *SubscribeRequest) XXX_Unmarshal(b []byte) error {
-	if x != nil {
+	return xxx_messageInfo_SubscribeRequest.Unmarshal(m, b)
-		return x.Topic
+}
+func (m *SubscribeRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SubscribeRequest.Marshal(b, m, deterministic)
+}
+func (m *SubscribeRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SubscribeRequest.Merge(m, src)
+}
+func (m *SubscribeRequest) XXX_Size() int {
+	return xxx_messageInfo_SubscribeRequest.Size(m)
+}
+func (m *SubscribeRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_SubscribeRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SubscribeRequest proto.InternalMessageInfo
+
+func (m *SubscribeRequest) GetTopic() string {
+	if m != nil {
+		return m.Topic
 	}
 	return ""
 }
 
 type SubscribeResponse struct {
-	state         protoimpl.MessageState
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	sizeCache     protoimpl.SizeCache
+	XXX_unrecognized     []byte   `json:"-"`
-	unknownFields protoimpl.UnknownFields
+	XXX_sizecache        int32    `json:"-"`
 }
 
-func (x *SubscribeResponse) Reset() {
+func (m *SubscribeResponse) Reset()         { *m = SubscribeResponse{} }
-	*x = SubscribeResponse{}
+func (m *SubscribeResponse) String() string { return proto.CompactTextString(m) }
-	if protoimpl.UnsafeEnabled {
+func (*SubscribeResponse) ProtoMessage()    {}
-		mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *SubscribeResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*SubscribeResponse) ProtoMessage() {}
-
-func (x *SubscribeResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[3]
-	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 SubscribeResponse.ProtoReflect.Descriptor instead.
 func (*SubscribeResponse) Descriptor() ([]byte, []int) {
-	return file_github_com_micro_go_micro_server_proto_server_proto_rawDescGZIP(), []int{3}
+	return fileDescriptor_1959cecd4d1121a1, []int{3}
 }
 
-var File_github_com_micro_go_micro_server_proto_server_proto protoreflect.FileDescriptor
+func (m *SubscribeResponse) XXX_Unmarshal(b []byte) error {
-
+	return xxx_messageInfo_SubscribeResponse.Unmarshal(m, b)
-var file_github_com_micro_go_micro_server_proto_server_proto_rawDesc = []byte{
+}
-	0x0a, 0x33, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6d, 0x69, 0x63,
+func (m *SubscribeResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	0x72, 0x6f, 0x2f, 0x67, 0x6f, 0x2d, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x2f, 0x73, 0x65, 0x72, 0x76,
+	return xxx_messageInfo_SubscribeResponse.Marshal(b, m, deterministic)
-	0x65, 0x72, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2e,
+}
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0f, 0x67, 0x6f, 0x2e, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x2e,
+func (m *SubscribeResponse) XXX_Merge(src proto.Message) {
-	0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x22, 0x61, 0x0a, 0x0d, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65,
+	xxx_messageInfo_SubscribeResponse.Merge(m, src)
-	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x18, 0x0a, 0x07, 0x73, 0x65, 0x72, 0x76, 0x69,
+}
-	0x63, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63,
+func (m *SubscribeResponse) XXX_Size() int {
-	0x65, 0x12, 0x1a, 0x0a, 0x08, 0x65, 0x6e, 0x64, 0x70, 0x6f, 0x69, 0x6e, 0x74, 0x18, 0x02, 0x20,
+	return xxx_messageInfo_SubscribeResponse.Size(m)
-	0x01, 0x28, 0x09, 0x52, 0x08, 0x65, 0x6e, 0x64, 0x70, 0x6f, 0x69, 0x6e, 0x74, 0x12, 0x1a, 0x0a,
+}
-	0x08, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52,
+func (m *SubscribeResponse) XXX_DiscardUnknown() {
-	0x08, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x22, 0x10, 0x0a, 0x0e, 0x48, 0x61, 0x6e,
+	xxx_messageInfo_SubscribeResponse.DiscardUnknown(m)
-	0x64, 0x6c, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x28, 0x0a, 0x10, 0x53,
-	0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12,
-	0x14, 0x0a, 0x05, 0x74, 0x6f, 0x70, 0x69, 0x63, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05,
-	0x74, 0x6f, 0x70, 0x69, 0x63, 0x22, 0x13, 0x0a, 0x11, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69,
-	0x62, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x32, 0xab, 0x01, 0x0a, 0x06, 0x53,
-	0x65, 0x72, 0x76, 0x65, 0x72, 0x12, 0x4b, 0x0a, 0x06, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x12,
-	0x1e, 0x2e, 0x67, 0x6f, 0x2e, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x2e, 0x73, 0x65, 0x72, 0x76, 0x65,
-	0x72, 0x2e, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a,
-	0x1f, 0x2e, 0x67, 0x6f, 0x2e, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x2e, 0x73, 0x65, 0x72, 0x76, 0x65,
-	0x72, 0x2e, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
-	0x22, 0x00, 0x12, 0x54, 0x0a, 0x09, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x12,
-	0x21, 0x2e, 0x67, 0x6f, 0x2e, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x2e, 0x73, 0x65, 0x72, 0x76, 0x65,
-	0x72, 0x2e, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65,
-	0x73, 0x74, 0x1a, 0x22, 0x2e, 0x67, 0x6f, 0x2e, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x2e, 0x73, 0x65,
-	0x72, 0x76, 0x65, 0x72, 0x2e, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x52, 0x65,
-	0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
-var (
+var xxx_messageInfo_SubscribeResponse proto.InternalMessageInfo
-	file_github_com_micro_go_micro_server_proto_server_proto_rawDescOnce sync.Once
-	file_github_com_micro_go_micro_server_proto_server_proto_rawDescData = file_github_com_micro_go_micro_server_proto_server_proto_rawDesc
-)
 
-func file_github_com_micro_go_micro_server_proto_server_proto_rawDescGZIP() []byte {
+func init() {
-	file_github_com_micro_go_micro_server_proto_server_proto_rawDescOnce.Do(func() {
+	proto.RegisterType((*HandleRequest)(nil), "go.micro.server.HandleRequest")
-		file_github_com_micro_go_micro_server_proto_server_proto_rawDescData = protoimpl.X.CompressGZIP(file_github_com_micro_go_micro_server_proto_server_proto_rawDescData)
+	proto.RegisterType((*HandleResponse)(nil), "go.micro.server.HandleResponse")
-	})
+	proto.RegisterType((*SubscribeRequest)(nil), "go.micro.server.SubscribeRequest")
-	return file_github_com_micro_go_micro_server_proto_server_proto_rawDescData
+	proto.RegisterType((*SubscribeResponse)(nil), "go.micro.server.SubscribeResponse")
 }
 
-var file_github_com_micro_go_micro_server_proto_server_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+func init() { proto.RegisterFile("server/proto/server.proto", fileDescriptor_1959cecd4d1121a1) }
-var file_github_com_micro_go_micro_server_proto_server_proto_goTypes = []interface{}{
+
-	(*HandleRequest)(nil),     // 0: go.micro.server.HandleRequest
+var fileDescriptor_1959cecd4d1121a1 = []byte{
-	(*HandleResponse)(nil),    // 1: go.micro.server.HandleResponse
+	// 223 bytes of a gzipped FileDescriptorProto
-	(*SubscribeRequest)(nil),  // 2: go.micro.server.SubscribeRequest
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x92, 0x2c, 0x4e, 0x2d, 0x2a,
-	(*SubscribeResponse)(nil), // 3: go.micro.server.SubscribeResponse
+	0x4b, 0x2d, 0xd2, 0x2f, 0x28, 0xca, 0x2f, 0xc9, 0xd7, 0x87, 0x70, 0xf4, 0xc0, 0x1c, 0x21, 0xfe,
-}
+	0xf4, 0x7c, 0xbd, 0xdc, 0xcc, 0xe4, 0xa2, 0x7c, 0x3d, 0x88, 0xb0, 0x52, 0x22, 0x17, 0xaf, 0x47,
-var file_github_com_micro_go_micro_server_proto_server_proto_depIdxs = []int32{
+	0x62, 0x5e, 0x4a, 0x4e, 0x6a, 0x50, 0x6a, 0x61, 0x69, 0x6a, 0x71, 0x89, 0x90, 0x04, 0x17, 0x3b,
-	0, // 0: go.micro.server.Server.Handle:input_type -> go.micro.server.HandleRequest
+	0x48, 0x2a, 0x33, 0x39, 0x55, 0x82, 0x51, 0x81, 0x51, 0x83, 0x33, 0x08, 0xc6, 0x15, 0x92, 0xe2,
-	2, // 1: go.micro.server.Server.Subscribe:input_type -> go.micro.server.SubscribeRequest
+	0xe2, 0x48, 0xcd, 0x4b, 0x29, 0xc8, 0xcf, 0xcc, 0x2b, 0x91, 0x60, 0x02, 0x4b, 0xc1, 0xf9, 0x20,
-	1, // 2: go.micro.server.Server.Handle:output_type -> go.micro.server.HandleResponse
+	0x39, 0xb0, 0x05, 0xc9, 0xf9, 0x39, 0x12, 0xcc, 0x10, 0x39, 0x18, 0x5f, 0x49, 0x80, 0x8b, 0x0f,
-	3, // 3: go.micro.server.Server.Subscribe:output_type -> go.micro.server.SubscribeResponse
+	0x66, 0x45, 0x71, 0x41, 0x7e, 0x5e, 0x71, 0xaa, 0x92, 0x06, 0x97, 0x40, 0x70, 0x69, 0x52, 0x71,
-	2, // [2:4] is the sub-list for method output_type
+	0x72, 0x51, 0x66, 0x12, 0xdc, 0x5e, 0x11, 0x2e, 0xd6, 0x92, 0xfc, 0x82, 0xcc, 0x64, 0xa8, 0xad,
-	0, // [0:2] is the sub-list for method input_type
+	0x10, 0x8e, 0x92, 0x30, 0x97, 0x20, 0x92, 0x4a, 0x88, 0x76, 0xa3, 0xd5, 0x8c, 0x5c, 0x6c, 0xc1,
-	0, // [0:0] is the sub-list for extension type_name
+	0x60, 0xe7, 0x0b, 0x79, 0x73, 0xb1, 0x41, 0xcc, 0x16, 0x92, 0xd3, 0x43, 0xf3, 0x9a, 0x1e, 0x8a,
-	0, // [0:0] is the sub-list for extension extendee
+	0xbf, 0xa4, 0xe4, 0x71, 0xca, 0x43, 0x1d, 0xc5, 0x20, 0x14, 0xc2, 0xc5, 0x09, 0xb7, 0x4c, 0x48,
-	0, // [0:0] is the sub-list for field type_name
+	0x11, 0x43, 0x3d, 0xba, 0x93, 0xa5, 0x94, 0xf0, 0x29, 0x81, 0x99, 0x9a, 0xc4, 0x06, 0x0e, 0x08,
+	0x63, 0x40, 0x00, 0x00, 0x00, 0xff, 0xff, 0xa4, 0x3f, 0x79, 0x80, 0x96, 0x01, 0x00, 0x00,
 }
 
-func init() { file_github_com_micro_go_micro_server_proto_server_proto_init() }
+// Reference imports to suppress errors if they are not otherwise used.
-func file_github_com_micro_go_micro_server_proto_server_proto_init() {
+var _ context.Context
-	if File_github_com_micro_go_micro_server_proto_server_proto != nil {
+var _ grpc.ClientConn
-		return
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// ServerClient is the client API for Server service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type ServerClient interface {
+	Handle(ctx context.Context, in *HandleRequest, opts ...grpc.CallOption) (*HandleResponse, error)
+	Subscribe(ctx context.Context, in *SubscribeRequest, opts ...grpc.CallOption) (*SubscribeResponse, error)
+}
+
+type serverClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewServerClient(cc *grpc.ClientConn) ServerClient {
+	return &serverClient{cc}
+}
+
+func (c *serverClient) Handle(ctx context.Context, in *HandleRequest, opts ...grpc.CallOption) (*HandleResponse, error) {
+	out := new(HandleResponse)
+	err := c.cc.Invoke(ctx, "/go.micro.server.Server/Handle", in, out, opts...)
+	if err != nil {
+		return nil, err
 	}
-	if !protoimpl.UnsafeEnabled {
+	return out, nil
-		file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+}
-			switch v := v.(*HandleRequest); i {
+
-			case 0:
+func (c *serverClient) Subscribe(ctx context.Context, in *SubscribeRequest, opts ...grpc.CallOption) (*SubscribeResponse, error) {
-				return &v.state
+	out := new(SubscribeResponse)
-			case 1:
+	err := c.cc.Invoke(ctx, "/go.micro.server.Server/Subscribe", in, out, opts...)
-				return &v.sizeCache
+	if err != nil {
-			case 2:
+		return nil, err
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*HandleResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_github_com_micro_go_micro_server_proto_server_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
 	}
-	type x struct{}
+	return out, nil
-	out := protoimpl.TypeBuilder{
+}
-		File: protoimpl.DescBuilder{
+
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+// ServerServer is the server API for Server service.
-			RawDescriptor: file_github_com_micro_go_micro_server_proto_server_proto_rawDesc,
+type ServerServer interface {
-			NumEnums:      0,
+	Handle(context.Context, *HandleRequest) (*HandleResponse, error)
-			NumMessages:   4,
+	Subscribe(context.Context, *SubscribeRequest) (*SubscribeResponse, error)
-			NumExtensions: 0,
+}
-			NumServices:   1,
+
+// UnimplementedServerServer can be embedded to have forward compatible implementations.
+type UnimplementedServerServer struct {
+}
+
+func (*UnimplementedServerServer) Handle(ctx context.Context, req *HandleRequest) (*HandleResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Handle not implemented")
+}
+func (*UnimplementedServerServer) Subscribe(ctx context.Context, req *SubscribeRequest) (*SubscribeResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Subscribe not implemented")
+}
+
+func RegisterServerServer(s *grpc.Server, srv ServerServer) {
+	s.RegisterService(&_Server_serviceDesc, srv)
+}
+
+func _Server_Handle_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(HandleRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ServerServer).Handle(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.server.Server/Handle",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ServerServer).Handle(ctx, req.(*HandleRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Server_Subscribe_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SubscribeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ServerServer).Subscribe(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/go.micro.server.Server/Subscribe",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ServerServer).Subscribe(ctx, req.(*SubscribeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _Server_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "go.micro.server.Server",
+	HandlerType: (*ServerServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Handle",
+			Handler:    _Server_Handle_Handler,
 		},
-		GoTypes:           file_github_com_micro_go_micro_server_proto_server_proto_goTypes,
+		{
-		DependencyIndexes: file_github_com_micro_go_micro_server_proto_server_proto_depIdxs,
+			MethodName: "Subscribe",
-		MessageInfos:      file_github_com_micro_go_micro_server_proto_server_proto_msgTypes,
+			Handler:    _Server_Subscribe_Handler,
-	}.Build()
+		},
-	File_github_com_micro_go_micro_server_proto_server_proto = out.File
+	},
-	file_github_com_micro_go_micro_server_proto_server_proto_rawDesc = nil
+	Streams:  []grpc.StreamDesc{},
-	file_github_com_micro_go_micro_server_proto_server_proto_goTypes = nil
+	Metadata: "server/proto/server.proto",
-	file_github_com_micro_go_micro_server_proto_server_proto_depIdxs = nil
 }

server/proto/server.pb.micro.go

@@ -1,5 +1,5 @@
 // Code generated by protoc-gen-micro. DO NOT EDIT.
-// source: github.com/micro/go-micro/server/proto/server.proto
+// source: server/proto/server.proto
 
 package go_micro_server
 

service.go

@@ -35,13 +35,14 @@ func newService(opts ...Option) Service {
 	// service name
 	serviceName := options.Server.Options().Name
 
-	// authFn returns the auth, we pass as a function since auth
+	// we pass functions to the wrappers since the values can change during initialisation
-	// has not yet been set at this point.
 	authFn := func() auth.Auth { return options.Server.Options().Auth }
+	cacheFn := func() *client.Cache { return options.Client.Options().Cache }
 
 	// wrap client to inject From-Service header on any calls
 	options.Client = wrapper.FromService(serviceName, options.Client)
 	options.Client = wrapper.TraceCall(serviceName, trace.DefaultTracer, options.Client)
+	options.Client = wrapper.CacheClient(cacheFn, options.Client)
 	options.Client = wrapper.AuthClient(authFn, options.Client)
 
 	// wrap the server to provide handler stats
@@ -183,7 +184,7 @@ func (s *service) Run() error {
 	// register the debug handler
 	s.opts.Server.Handle(
 		s.opts.Server.NewHandler(
-			handler.NewHandler(),
+			handler.NewHandler(s.opts.Client),
 			server.InternalHandler(true),
 		),
 	)

util/file/proto/file.pb.micro.go

@@ -1,5 +1,5 @@
 // Code generated by protoc-gen-micro. DO NOT EDIT.
-// source: micro/go-micro/util/file/proto/file.proto
+// source: util/file/proto/file.proto
 
 package go_micro_server
 

util/mux/mux.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"sync"
 
+	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/debug/service/handler"
 	"github.com/micro/go-micro/v2/proxy"
 	"github.com/micro/go-micro/v2/server"
@@ -42,7 +43,7 @@ func New(name string, p proxy.Proxy) *Server {
 		server.DefaultRouter.Handle(
 			// inject the debug handler
 			server.DefaultRouter.NewHandler(
-				handler.NewHandler(),
+				handler.NewHandler(client.DefaultClient),
 				server.InternalHandler(true),
 			),
 		)

util/wrapper/wrapper.go

@@ -2,6 +2,7 @@ package wrapper
 
 import (
 	"context"
+	"reflect"
 	"strings"
 	"time"
 
@@ -227,3 +228,55 @@ func AuthHandler(fn func() auth.Auth) server.HandlerWrapper {
 		}
 	}
 }
+
+type cacheWrapper struct {
+	cacheFn func() *client.Cache
+	client.Client
+}
+
+// Call executes the request. If the CacheExpiry option was set, the response will be cached using
+// a hash of the metadata and request as the key.
+func (c *cacheWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+	// parse the options
+	var options client.CallOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
+	// if the client doesn't have a cacbe setup don't continue
+	cache := c.cacheFn()
+	if cache == nil {
+		return c.Client.Call(ctx, req, rsp, opts...)
+	}
+
+	// if the cache expiry is not set, execute the call without the cache
+	if options.CacheExpiry == 0 {
+		return c.Client.Call(ctx, req, rsp, opts...)
+	}
+
+	// if the response is nil don't call the cache since we can't assign the response
+	if rsp == nil {
+		return c.Client.Call(ctx, req, rsp, opts...)
+	}
+
+	// check to see if there is a response cached, if there is assign it
+	if r, ok := cache.Get(ctx, &req); ok {
+		val := reflect.ValueOf(rsp).Elem()
+		val.Set(reflect.ValueOf(r).Elem())
+		return nil
+	}
+
+	// don't cache the result if there was an error
+	if err := c.Client.Call(ctx, req, rsp, opts...); err != nil {
+		return err
+	}
+
+	// set the result in the cache
+	cache.Set(ctx, &req, rsp, options.CacheExpiry)
+	return nil
+}
+
+// CacheClient wraps requests with the cache wrapper
+func CacheClient(cacheFn func() *client.Cache, c client.Client) client.Client {
+	return &cacheWrapper{cacheFn, c}
+}

util/wrapper/wrapper_test.go

@@ -2,8 +2,11 @@ package wrapper
 
 import (
 	"context"
+	"reflect"
 	"testing"
+	"time"
 
+	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/metadata"
 )
 
@@ -49,5 +52,100 @@ func TestWrapper(t *testing.T) {
 			}
 		}
 	}
-
+}
+
+type testClient struct {
+	callCount int
+	callRsp   interface{}
+	client.Client
+}
+
+func (c *testClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+	c.callCount++
+
+	if c.callRsp != nil {
+		val := reflect.ValueOf(rsp).Elem()
+		val.Set(reflect.ValueOf(c.callRsp).Elem())
+	}
+
+	return nil
+}
+
+type testRsp struct {
+	value string
+}
+
+func TestCacheWrapper(t *testing.T) {
+	req := client.NewRequest("go.micro.service.foo", "Foo.Bar", nil)
+
+	t.Run("NilCache", func(t *testing.T) {
+		cli := new(testClient)
+
+		w := CacheClient(func() *client.Cache {
+			return nil
+		}, cli)
+
+		// perfroming two requests should increment the call count by two indicating the cache wasn't
+		// used even though the WithCache option was passed.
+		w.Call(context.TODO(), req, nil, client.WithCache(time.Minute))
+		w.Call(context.TODO(), req, nil, client.WithCache(time.Minute))
+
+		if cli.callCount != 2 {
+			t.Errorf("Expected the client to have been called twice")
+		}
+	})
+
+	t.Run("OptionNotSet", func(t *testing.T) {
+		cli := new(testClient)
+		cache := client.NewCache()
+
+		w := CacheClient(func() *client.Cache {
+			return cache
+		}, cli)
+
+		// perfroming two requests should increment the call count by two since we didn't pass the WithCache
+		// option to Call.
+		w.Call(context.TODO(), req, nil)
+		w.Call(context.TODO(), req, nil)
+
+		if cli.callCount != 2 {
+			t.Errorf("Expected the client to have been called twice")
+		}
+	})
+
+	t.Run("OptionSet", func(t *testing.T) {
+		val := "foo"
+		cli := &testClient{callRsp: &testRsp{value: val}}
+		cache := client.NewCache()
+
+		w := CacheClient(func() *client.Cache {
+			return cache
+		}, cli)
+
+		// perfroming two requests should increment the call count by once since the second request should
+		// have used the cache. The correct value should be set on both responses and no errors should
+		// be returned.
+		rsp1 := &testRsp{}
+		rsp2 := &testRsp{}
+		err1 := w.Call(context.TODO(), req, rsp1, client.WithCache(time.Minute))
+		err2 := w.Call(context.TODO(), req, rsp2, client.WithCache(time.Minute))
+
+		if err1 != nil {
+			t.Errorf("Expected nil error, got %v", err1)
+		}
+		if err2 != nil {
+			t.Errorf("Expected nil error, got %v", err2)
+		}
+
+		if rsp1.value != val {
+			t.Errorf("Expected %v to be assigned to the value, got %v", val, rsp1.value)
+		}
+		if rsp2.value != val {
+			t.Errorf("Expected %v to be assigned to the value, got %v", val, rsp2.value)
+		}
+
+		if cli.callCount != 1 {
+			t.Errorf("Expected the client to be called 1 time, was actually called %v time(s)", cli.callCount)
+		}
+	})
 }