rework metadata

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

broker/memory_test.go

@@ -37,10 +37,10 @@ func TestMemoryBatchBroker(t *testing.T) {
 	msgs := make([]Message, 0, count)
 	for i := 0; i < count; i++ {
 		message := &memoryMessage{
-			header: map[string]string{
+			header: metadata.Metadata{
-				metadata.HeaderTopic: topic,
+				metadata.HeaderTopic: []string{topic},
-				"foo":                "bar",
+				"foo":                []string{"bar"},
-				"id":                 fmt.Sprintf("%d", i),
+				"id":                 []string{fmt.Sprintf("%d", i)},
 			},
 			body: []byte(`"hello world"`),
 		}
@@ -83,10 +83,10 @@ func TestMemoryBroker(t *testing.T) {
 	msgs := make([]Message, 0, count)
 	for i := 0; i < count; i++ {
 		message := &memoryMessage{
-			header: map[string]string{
+			header: metadata.Metadata{
-				metadata.HeaderTopic: topic,
+				metadata.HeaderTopic: []string{topic},
-				"foo":                "bar",
+				"foo":                []string{"bar"},
-				"id":                 fmt.Sprintf("%d", i),
+				"id":                 []string{fmt.Sprintf("%d", i)},
 			},
 			body: []byte(`"hello world"`),
 		}

metadata/context.go

@@ -17,11 +17,11 @@ func FromIncomingContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
 	}
-	md, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata)
+	md, ok := ctx.Value(mdIncomingKey{}).(Metadata)
-	if !ok || md.md == nil {
+	if !ok || md == nil {
 		return nil, false
 	}
-	return md.md, ok
+	return md, ok
 }
 
 // FromOutgoingContext returns metadata from outgoing ctx
@@ -30,11 +30,11 @@ func FromOutgoingContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
 	}
-	md, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata)
+	md, ok := ctx.Value(mdOutgoingKey{}).(Metadata)
-	if !ok || md.md == nil {
+	if !ok || md == nil {
 		return nil, false
 	}
-	return md.md, ok
+	return md, ok
 }
 
 // FromContext returns metadata from the given context
@@ -43,11 +43,11 @@ func FromContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
 	}
-	md, ok := ctx.Value(mdKey{}).(*rawMetadata)
+	md, ok := ctx.Value(mdKey{}).(Metadata)
-	if !ok || md.md == nil {
+	if !ok || md == nil {
 		return nil, false
 	}
-	return md.md, ok
+	return md, ok
 }
 
 // NewContext creates a new context with the given metadata
@@ -55,45 +55,16 @@ func NewContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	ctx = context.WithValue(ctx, mdKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdKey{}, md)
-	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{})
-	ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
 	return ctx
 }
 
-// SetOutgoingContext modify outgoing context with given metadata
-func SetOutgoingContext(ctx context.Context, md Metadata) bool {
-	if ctx == nil {
-		return false
-	}
-	if omd, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata); ok {
-		omd.md = md
-		return true
-	}
-	return false
-}
-
-// SetIncomingContext modify incoming context with given metadata
-func SetIncomingContext(ctx context.Context, md Metadata) bool {
-	if ctx == nil {
-		return false
-	}
-	if omd, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata); ok {
-		omd.md = md
-		return true
-	}
-	return false
-}
-
 // NewIncomingContext creates a new context with incoming metadata attached
 func NewIncomingContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdIncomingKey{}, md)
-	if v, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata); !ok || v == nil {
-		ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
-	}
 	return ctx
 }
 
@@ -102,41 +73,28 @@ func NewOutgoingContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdOutgoingKey{}, md)
-	if v, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata); !ok || v == nil {
-		ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{})
-	}
 	return ctx
 }
 
 // AppendOutgoingContext apends new md to context
 func AppendOutgoingContext(ctx context.Context, kv ...string) context.Context {
-	md, ok := Pairs(kv...)
+	md := Pairs(kv...)
-	if !ok {
-		return ctx
-	}
 	omd, ok := FromOutgoingContext(ctx)
 	if !ok {
 		return NewOutgoingContext(ctx, md)
 	}
-	for k, v := range md {
+	nmd := Merge(omd, md, true)
-		omd.Set(k, v)
+	return NewOutgoingContext(ctx, nmd)
-	}
-	return NewOutgoingContext(ctx, omd)
 }
 
 // AppendIncomingContext apends new md to context
 func AppendIncomingContext(ctx context.Context, kv ...string) context.Context {
-	md, ok := Pairs(kv...)
+	md := Pairs(kv...)
-	if !ok {
-		return ctx
-	}
 	omd, ok := FromIncomingContext(ctx)
 	if !ok {
 		return NewIncomingContext(ctx, md)
 	}
-	for k, v := range md {
+	nmd := Merge(omd, md, true)
-		omd.Set(k, v)
+	return NewIncomingContext(ctx, nmd)
-	}
-	return NewIncomingContext(ctx, omd)
 }

metadata/context_test.go

@@ -24,7 +24,7 @@ func TestNewNilContext(t *testing.T) {
 }
 
 func TestFromContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), mdKey{}, &rawMetadata{New(0)})
+	ctx := context.WithValue(context.TODO(), mdKey{}, New(0))
 
 	c, ok := FromContext(ctx)
 	if c == nil || !ok {
@@ -42,7 +42,7 @@ func TestNewContext(t *testing.T) {
 }
 
 func TestFromIncomingContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, &rawMetadata{New(0)})
+	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, New(0))
 
 	c, ok := FromIncomingContext(ctx)
 	if c == nil || !ok {
@@ -51,7 +51,7 @@ func TestFromIncomingContext(t *testing.T) {
 }
 
 func TestFromOutgoingContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, &rawMetadata{New(0)})
+	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, New(0))
 
 	c, ok := FromOutgoingContext(ctx)
 	if c == nil || !ok {
@@ -59,36 +59,6 @@ func TestFromOutgoingContext(t *testing.T) {
 	}
 }
 
-func TestSetIncomingContext(t *testing.T) {
-	md := New(1)
-	md.Set("key", "val")
-	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, &rawMetadata{})
-	if !SetIncomingContext(ctx, md) {
-		t.Fatal("SetIncomingContext not works")
-	}
-	md, ok := FromIncomingContext(ctx)
-	if md == nil || !ok {
-		t.Fatal("SetIncomingContext not works")
-	} else if v, ok := md.Get("key"); !ok || v != "val" {
-		t.Fatal("SetIncomingContext not works")
-	}
-}
-
-func TestSetOutgoingContext(t *testing.T) {
-	md := New(1)
-	md.Set("key", "val")
-	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, &rawMetadata{})
-	if !SetOutgoingContext(ctx, md) {
-		t.Fatal("SetOutgoingContext not works")
-	}
-	md, ok := FromOutgoingContext(ctx)
-	if md == nil || !ok {
-		t.Fatal("SetOutgoingContext not works")
-	} else if v, ok := md.Get("key"); !ok || v != "val" {
-		t.Fatal("SetOutgoingContext not works")
-	}
-}
-
 func TestNewIncomingContext(t *testing.T) {
 	md := New(1)
 	md.Set("key", "val")

metadata/metadata.go

@@ -1,9 +1,9 @@
 // Package metadata is a way of defining message headers
-package metadata // import "go.unistack.org/micro/v4/metadata"
+package metadata
 
 import (
 	"net/textproto"
-	"sort"
+	"strings"
 )
 
 var (
@@ -24,47 +24,7 @@ var (
 )
 
 // Metadata is our way of representing request headers internally.
-// They're used at the RPC level and translate back and forth
+type Metadata map[string][]string
-// from Transport headers.
-type Metadata map[string]string
-
-type rawMetadata struct {
-	md Metadata
-}
-
-// defaultMetadataSize used when need to init new Metadata
-var defaultMetadataSize = 2
-
-// Iterator used to iterate over metadata with order
-type Iterator struct {
-	md   Metadata
-	keys []string
-	cur  int
-	cnt  int
-}
-
-// Next advance iterator to next element
-func (iter *Iterator) Next(k, v *string) bool {
-	if iter.cur+1 > iter.cnt {
-		return false
-	}
-
-	*k = iter.keys[iter.cur]
-	*v = iter.md[*k]
-	iter.cur++
-	return true
-}
-
-// Iterator returns the itarator for metadata in sorted order
-func (md Metadata) Iterator() *Iterator {
-	iter := &Iterator{md: md, cnt: len(md)}
-	iter.keys = make([]string, 0, iter.cnt)
-	for k := range md {
-		iter.keys = append(iter.keys, k)
-	}
-	sort.Strings(iter.keys)
-	return iter
-}
 
 // Get returns value from metadata by key
 func (md Metadata) Get(key string) (string, bool) {
@@ -74,7 +34,7 @@ func (md Metadata) Get(key string) (string, bool) {
 		// slow path
 		val, ok = md[textproto.CanonicalMIMEHeaderKey(key)]
 	}
-	return val, ok
+	return strings.Join(val, ","), ok
 }
 
 // Set is used to store value in metadata
@@ -83,10 +43,19 @@ func (md Metadata) Set(kv ...string) {
 		kv = kv[:len(kv)-1]
 	}
 	for idx := 0; idx < len(kv); idx += 2 {
-		md[textproto.CanonicalMIMEHeaderKey(kv[idx])] = kv[idx+1]
+		md[textproto.CanonicalMIMEHeaderKey(kv[idx])] = []string{kv[idx+1]}
 	}
 }
 
+// Append is used to append value in metadata
+func (md Metadata) Append(k string, v ...string) {
+	if len(v) == 0 {
+		return
+	}
+	k = textproto.CanonicalMIMEHeaderKey(k)
+	md[k] = append(md[k], v...)
+}
+
 // Del is used to remove value from metadata
 func (md Metadata) Del(keys ...string) {
 	for _, key := range keys {
@@ -99,9 +68,9 @@ func (md Metadata) Del(keys ...string) {
 
 // Copy makes a copy of the metadata
 func Copy(md Metadata) Metadata {
-	nmd := New(len(md))
+	nmd := make(Metadata, len(md))
-	for key, val := range md {
+	for k, v := range md {
-		nmd.Set(key, val)
+		nmd[k] = v
 	}
 	return nmd
 }
@@ -109,35 +78,40 @@ func Copy(md Metadata) Metadata {
 // New return new sized metadata
 func New(size int) Metadata {
 	if size == 0 {
-		size = defaultMetadataSize
+		size = 2
 	}
 	return make(Metadata, size)
 }
 
 // Merge merges metadata to existing metadata, overwriting if specified
 func Merge(omd Metadata, mmd Metadata, overwrite bool) Metadata {
-	var ok bool
 	nmd := Copy(omd)
 	for key, val := range mmd {
-		_, ok = nmd[key]
+		nval, ok := nmd[key]
 		switch {
+		case ok && overwrite:
+			nmd[key] = nval
+			continue
 		case ok && !overwrite:
 			continue
-		case val != "":
+		case !ok:
-			nmd.Set(key, val)
+			for _, v := range val {
-		case ok && val == "":
+				if v != "" {
-			nmd.Del(key)
+					nval = append(nval, v)
+				}
+			}
+			nmd[key] = nval
 		}
 	}
 	return nmd
 }
 
 // Pairs from which metadata created
-func Pairs(kv ...string) (Metadata, bool) {
+func Pairs(kv ...string) Metadata {
 	if len(kv)%2 == 1 {
-		return nil, false
+		kv = kv[:len(kv)-1]
 	}
-	md := New(len(kv) / 2)
+	md := make(Metadata, len(kv)/2)
 	md.Set(kv...)
-	return md, true
+	return md
 }

metadata/metadata_test.go

@@ -33,20 +33,25 @@ func TestAppend(t *testing.T) {
 }
 
 func TestPairs(t *testing.T) {
-	md, ok := Pairs("key1", "val1", "key2", "val2")
+	md := Pairs("key1", "val1", "key2", "val2")
-	if !ok {
+
-		t.Fatal("odd number of kv")
+	if _, ok := md.Get("key1"); !ok {
-	}
-	if _, ok = md.Get("key1"); !ok {
 		t.Fatal("key1 not found")
 	}
 }
 
-func testCtx(ctx context.Context) {
+func testIncomingCtx(ctx context.Context) {
-	md := New(2)
+	if md, ok := FromIncomingContext(ctx); ok && md != nil {
-	md.Set("Key1", "Val1_new")
+		md.Set("Key1", "Val1_new")
-	md.Set("Key3", "Val3")
+		md.Set("Key3", "Val3")
-	SetOutgoingContext(ctx, md)
+	}
+}
+
+func testOutgoingCtx(ctx context.Context) {
+	if md, ok := FromOutgoingContext(ctx); ok && md != nil {
+		md.Set("Key1", "Val1_new")
+		md.Set("Key3", "Val3")
+	}
 }
 
 func TestPassing(t *testing.T) {
@@ -55,8 +60,8 @@ func TestPassing(t *testing.T) {
 	md1.Set("Key1", "Val1")
 	md1.Set("Key2", "Val2")
 
-	ctx = NewIncomingContext(ctx, md1)
+	ctx = NewOutgoingContext(ctx, md1)
-	testCtx(ctx)
+	testOutgoingCtx(ctx)
 	md, ok := FromOutgoingContext(ctx)
 	if !ok {
 		t.Fatalf("missing metadata from outgoing context")
@@ -68,10 +73,10 @@ func TestPassing(t *testing.T) {
 
 func TestMerge(t *testing.T) {
 	omd := Metadata{
-		"key1": "val1",
+		"key1": []string{"val1"},
 	}
 	mmd := Metadata{
-		"key2": "val2",
+		"key2": []string{"val2"},
 	}
 
 	nmd := Merge(omd, mmd, true)
@@ -80,21 +85,6 @@ func TestMerge(t *testing.T) {
 	}
 }
 
-func TestIterator(t *testing.T) {
-	md := Metadata{
-		"1Last":   "last",
-		"2First":  "first",
-		"3Second": "second",
-	}
-
-	iter := md.Iterator()
-	var k, v string
-
-	for iter.Next(&k, &v) {
-		// fmt.Printf("k: %s, v: %s\n", k, v)
-	}
-}
-
 func TestMedataCanonicalKey(t *testing.T) {
 	md := New(1)
 	md.Set("x-request-id", "12345")
@@ -134,10 +124,7 @@ func TestMetadataSet(t *testing.T) {
 }
 
 func TestMetadataDelete(t *testing.T) {
-	md := Metadata{
+	md := Pairs("Foo", "bar", "Baz", "empty")
-		"Foo": "bar",
-		"Baz": "empty",
-	}
 
 	md.Del("Baz")
 	_, ok := md.Get("Baz")
@@ -156,24 +143,19 @@ func TestNilContext(t *testing.T) {
 }
 
 func TestMetadataCopy(t *testing.T) {
-	md := Metadata{
+	md := Pairs("Foo", "bar", "Bar", "baz")
-		"Foo": "bar",
-		"Bar": "baz",
-	}
 
 	cp := Copy(md)
 
 	for k, v := range md {
-		if cv := cp[k]; cv != v {
+		if cv := cp[k]; len(cv) != len(v) {
 			t.Fatalf("Got %s:%s for %s:%s", k, cv, k, v)
 		}
 	}
 }
 
 func TestMetadataContext(t *testing.T) {
-	md := Metadata{
+	md := Pairs("Foo", "bar")
-		"Foo": "bar",
-	}
 
 	ctx := NewContext(context.TODO(), md)
 
@@ -182,7 +164,7 @@ func TestMetadataContext(t *testing.T) {
 		t.Errorf("Unexpected error retrieving metadata, got %t", ok)
 	}
 
-	if emd["Foo"] != md["Foo"] {
+	if len(emd["Foo"]) != len(md["Foo"]) {
 		t.Errorf("Expected key: %s val: %s, got key: %s val: %s", "Foo", md["Foo"], "Foo", emd["Foo"])
 	}
 

options/options.go

@@ -158,17 +158,28 @@ func Metadata(md ...any) Option {
 		case metadata.Metadata:
 			result = metadata.Copy(vt)
 		case map[string]string:
+			result = make(metadata.Metadata, len(vt))
+			for k, v := range vt {
+				result.Set(k, v)
+			}
+		case map[string][]string:
 			result = metadata.Copy(vt)
 		default:
 			result = metadata.New(0)
 		}
 	} else {
 		result = metadata.New(len(md) / 2)
-		for idx := 0; idx < len(md)/2; idx += 2 {
+		for idx := 0; idx <= len(md)/2; idx += 2 {
-			k, kok := md[idx].(string)
+			k, ok := md[idx].(string)
-			v, vok := md[idx+1].(string)
+			switch vt := md[idx+1].(type) {
-			if kok && vok {
+			case string:
-				result.Set(k, v)
+				if ok {
+					result.Set(k, vt)
+				}
+			case []string:
+				if ok {
+					result.Append(k, vt...)
+				}
 			}
 		}
 	}

options/options_test.go

@@ -100,40 +100,29 @@ func TestMetadataAny(t *testing.T) {
 	}{
 		{
 			"strings_even",
-			[]any{"key1", "val1", "key2", "val2"},
+			[]any{"Strkey1", []string{"val1"}, "Strkey2", []string{"val2"}},
-			metadata.Metadata{
+			metadata.Pairs("Strkey1", "val1", "Strkey2", "val2"),
-				"Key1": "val1",
-				"Key2": "val2",
-			},
 		},
 		{
 			"strings_odd",
 			[]any{"key1", "val1", "key2"},
-			metadata.Metadata{
+			metadata.Pairs("Key1", "val1"),
-				"Key1": "val1",
-			},
 		},
 		{
 			Name: "map",
-			Data: map[string]string{
+			Data: map[string][]string{
-				"key1": "val1",
+				"Mapkey1": {"val1"},
-				"key2": "val2",
+				"Mapkey2": {"val2"},
 			},
 			Expected: metadata.Metadata{
-				"Key1": "val1",
+				"Mapkey1": []string{"val1"},
-				"Key2": "val2",
+				"Mapkey2": []string{"val2"},
 			},
 		},
 		{
 			"metadata.Metadata",
-			metadata.Metadata{
+			metadata.Pairs("key1", "val1", "key2", "val2"),
-				"key1": "val1",
+			metadata.Pairs("Key1", "val1", "Key2", "val2"),
-				"key2": "val2",
-			},
-			metadata.Metadata{
-				"Key1": "val1",
-				"Key2": "val2",
-			},
 		},
 	}
 
@@ -143,8 +132,9 @@ func TestMetadataAny(t *testing.T) {
 			var opts []options.Option
 			switch valData := tt.Data.(type) {
 			case []any:
+				fmt.Printf("%s any %#+v\n", tt.Name, valData)
 				opts = append(opts, options.Metadata(valData...))
-			case map[string]string, metadata.Metadata:
+			case map[string]string, map[string][]string, metadata.Metadata:
 				opts = append(opts, options.Metadata(valData))
 			}
 
@@ -153,7 +143,7 @@ func TestMetadataAny(t *testing.T) {
 					t.Fatal(err)
 				}
 				if !reflect.Equal(tt.Expected, src.Metadata) {
-					t.Fatal(fmt.Sprintf("expected: %v, actual: %v", tt.Expected, src.Metadata))
+					t.Fatalf("expected: %v, actual: %v", tt.Expected, src.Metadata)
 				}
 			}
 		})

register/memory/memory.go

@@ -2,10 +2,12 @@ package memory
 
 import (
 	"context"
-	"go.unistack.org/micro/v4/register"
 	"sync"
 	"time"
 
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/register"
+
 	"go.unistack.org/micro/v4/logger"
 	"go.unistack.org/micro/v4/util/id"
 )
@@ -24,7 +26,7 @@ type node struct {
 type record struct {
 	Name      string
 	Version   string
-	Metadata  map[string]string
+	Metadata  metadata.Metadata
 	Nodes     map[string]*node
 	Endpoints []*register.Endpoint
 }
@@ -137,11 +139,11 @@ func (m *memory) Register(ctx context.Context, s *register.Service, opts ...regi
 
 	// domain is set in metadata so it can be passed to watchers
 	if s.Metadata == nil {
-		s.Metadata = map[string]string{"domain": options.Domain}
+		s.Metadata = metadata.New(0)
-	} else {
-		s.Metadata["domain"] = options.Domain
 	}
 
+	s.Metadata.Set("domain", options.Domain)
+
 	// ensure the service name exists
 	r := serviceToRecord(s, options.TTL)
 	if _, ok := srvs[s.Name]; !ok {
@@ -165,15 +167,8 @@ func (m *memory) Register(ctx context.Context, s *register.Service, opts ...regi
 			continue
 		}
 
-		metadata := make(map[string]string, len(n.Metadata))
+		metadata := metadata.Copy(n.Metadata)
-
+		metadata.Set("domain", options.Domain)
-		// make copy of metadata
-		for k, v := range n.Metadata {
-			metadata[k] = v
-		}
-
-		// set the domain
-		metadata["domain"] = options.Domain
 
 		// add the node
 		srvs[s.Name][s.Version].Nodes[n.ID] = &node{
@@ -217,10 +212,9 @@ func (m *memory) Deregister(ctx context.Context, s *register.Service, opts ...re
 
 	// domain is set in metadata so it can be passed to watchers
 	if s.Metadata == nil {
-		s.Metadata = map[string]string{"domain": options.Domain}
+		s.Metadata = metadata.New(0)
-	} else {
-		s.Metadata["domain"] = options.Domain
 	}
+	s.Metadata.Set("domain", options.Domain)
 
 	// if the domain doesn't exist, there is nothing to deregister
 	services, ok := m.records[options.Domain]
@@ -425,16 +419,24 @@ func (m *watcher) Next() (*register.Result, error) {
 				continue
 			}
 
+			if m.wo.Domain == register.WildcardDomain {
+				return r, nil
+			}
+
+			if r.Service.Metadata == nil {
+				continue
+			}
+
 			// extract domain from service metadata
 			var domain string
-			if r.Service.Metadata != nil && len(r.Service.Metadata["domain"]) > 0 {
+			if v, ok := r.Service.Metadata.Get("domain"); ok && v != "" {
-				domain = r.Service.Metadata["domain"]
+				domain = v
 			} else {
 				domain = register.DefaultDomain
 			}
 
 			// only send the event if watching the wildcard or this specific domain
-			if m.wo.Domain == register.WildcardDomain || m.wo.Domain == domain {
+			if m.wo.Domain == domain {
 				return r, nil
 			}
 		case <-m.exit:
@@ -453,10 +455,7 @@ func (m *watcher) Stop() {
 }
 
 func serviceToRecord(s *register.Service, ttl time.Duration) *record {
-	metadata := make(map[string]string, len(s.Metadata))
+	metadata := metadata.Copy(s.Metadata)
-	for k, v := range s.Metadata {
-		metadata[k] = v
-	}
 
 	nodes := make(map[string]*node, len(s.Nodes))
 	for _, n := range s.Nodes {
@@ -482,20 +481,11 @@ func serviceToRecord(s *register.Service, ttl time.Duration) *record {
 }
 
 func recordToService(r *record, domain string) *register.Service {
-	metadata := make(map[string]string, len(r.Metadata))
-	for k, v := range r.Metadata {
-		metadata[k] = v
-	}
-
-	// set the domain in metadata so it can be determined when a wildcard query is performed
-	metadata["domain"] = domain
-
 	endpoints := make([]*register.Endpoint, len(r.Endpoints))
 	for i, e := range r.Endpoints {
-		md := make(map[string]string, len(e.Metadata))
+		md := metadata.Copy(e.Metadata)
-		for k, v := range e.Metadata {
+		// set the domain in metadata so it can be determined when a wildcard query is performed
-			md[k] = v
+		md.Set("domain", domain)
-		}
 
 		endpoints[i] = &register.Endpoint{
 			Name:     e.Name,
@@ -508,15 +498,10 @@ func recordToService(r *record, domain string) *register.Service {
 	nodes := make([]*register.Node, len(r.Nodes))
 	i := 0
 	for _, n := range r.Nodes {
-		md := make(map[string]string, len(n.Metadata))
-		for k, v := range n.Metadata {
-			md[k] = v
-		}
-
 		nodes[i] = &register.Node{
 			ID:       n.ID,
 			Address:  n.Address,
-			Metadata: md,
+			Metadata: metadata.Copy(n.Metadata),
 		}
 		i++
 	}
@@ -524,7 +509,7 @@ func recordToService(r *record, domain string) *register.Service {
 	return &register.Service{
 		Name:      r.Name,
 		Version:   r.Version,
-		Metadata:  metadata,
+		Metadata:  metadata.Copy(r.Metadata),
 		Endpoints: endpoints,
 		Nodes:     nodes,
 	}

server/noop.go

@@ -112,8 +112,8 @@ func (n *noopServer) Register() error {
 	}
 	n.RUnlock()
 
-	service.Nodes[0].Metadata["protocol"] = "noop"
+	service.Nodes[0].Metadata.Set("protocol", "noop")
-	service.Nodes[0].Metadata["transport"] = service.Nodes[0].Metadata["protocol"]
+	service.Nodes[0].Metadata.Set("transport", "noop")
 	service.Endpoints = endpoints
 
 	n.RLock()

server/registry.go

@@ -77,8 +77,8 @@ func NewRegisterService(s Server) (*register.Service, error) {
 	}
 	node.Metadata = metadata.Copy(opts.Metadata)
 
-	node.Metadata["server"] = s.String()
+	node.Metadata.Set("server", s.String())
-	node.Metadata["register"] = opts.Register.String()
+	node.Metadata.Set("register", opts.Register.String())
 
 	return &register.Service{
 		Name:     opts.Name,

util/reflect/reflect.go

@@ -532,6 +532,9 @@ func Equal(src interface{}, dst interface{}, excptFields ...string) bool {
 			}
 			s := srcVal.MapIndex(key)
 			d := dstVal.MapIndex(key)
+			if !s.IsValid() || !d.IsValid() {
+				return false
+			}
 			if !Equal(s.Interface(), d.Interface(), excptFields...) {
 				return false
 			}

util/time/duration_test.go

@@ -35,7 +35,7 @@ func TestUnmarshalJSON(t *testing.T) {
 	err = json.Unmarshal([]byte(`{"ttl":"1y"}`), v)
 	if err != nil {
 		t.Fatal(err)
-	} else if v.TTL != 31536000000000000 {
+	} else if v.TTL != 31622400000000000 {
 		t.Fatalf("invalid duration %v != 31536000000000000", v.TTL)
 	}
 }
@@ -55,7 +55,7 @@ func TestParseDuration(t *testing.T) {
 	if err != nil {
 		t.Fatalf("ParseDuration error: %v", err)
 	}
-	if td.String() != "8760h0m0s" {
+	if td.String() != "8784h0m0s" {
 		t.Fatalf("ParseDuration 1y != 8760h0m0s : %s", td.String())
 	}
 }