[BUGFIX] Added Service Meta support in configuration files

agent/agent_endpoint.go

@@ -131,9 +131,18 @@ func (s *HTTPServer) AgentServices(resp http.ResponseWriter, req *http.Request)
 
 	// Use empty list instead of nil
 	for id, s := range services {
-		if s.Tags == nil {
+		if s.Tags == nil || s.Meta == nil {
 			clone := *s
-			clone.Tags = make([]string, 0)
+			if s.Tags == nil {
+				clone.Tags = make([]string, 0)
+			} else {
+				clone.Tags = s.Tags
+			}
+			if s.Meta == nil {
+				clone.Meta = make(map[string]string)
+			} else {
+				clone.Meta = s.Meta
+			}
 			services[id] = &clone
 		}
 	}

agent/agent_endpoint_test.go

@@ -1204,6 +1204,7 @@ func TestAgent_RegisterService(t *testing.T) {
 
 	args := &structs.ServiceDefinition{
 		Name: "test",
+		Meta: map[string]string{"hello": "world"},
 		Tags: []string{"master"},
 		Port: 8000,
 		Check: structs.CheckType{
@@ -1232,6 +1233,9 @@ func TestAgent_RegisterService(t *testing.T) {
 	if _, ok := a.State.Services()["test"]; !ok {
 		t.Fatalf("missing test service")
 	}
+	if val := a.State.Service("test").Meta["hello"]; val != "world" {
+		t.Fatalf("Missing meta: %v", a.State.Service("test").Meta)
+	}
 
 	// Ensure we have a check mapping
 	checks := a.State.Checks()
@@ -1254,7 +1258,7 @@ func TestAgent_RegisterService_TranslateKeys(t *testing.T) {
 	a := NewTestAgent(t.Name(), "")
 	defer a.Shutdown()
 
-	json := `{"name":"test", "port":8000, "enable_tag_override": true}`
+	json := `{"name":"test", "port":8000, "enable_tag_override": true, "meta": {"some": "meta"}}`
 	req, _ := http.NewRequest("PUT", "/v1/agent/service/register", strings.NewReader(json))
 
 	obj, err := a.srv.AgentRegisterService(nil, req)
@@ -1264,10 +1268,10 @@ func TestAgent_RegisterService_TranslateKeys(t *testing.T) {
 	if obj != nil {
 		t.Fatalf("bad: %v", obj)
 	}
-
 	svc := &structs.NodeService{
 		ID:                "test",
 		Service:           "test",
+		Meta:              map[string]string{"some": "meta"},
 		Port:              8000,
 		EnableTagOverride: true,
 	}

agent/config/builder.go

@@ -997,11 +997,18 @@ func (b *Builder) serviceVal(v *ServiceDefinition) *structs.ServiceDefinition {
 		checks = append(checks, b.checkVal(v.Check).CheckType())
 	}
 
+	meta := make(map[string]string)
+	if err := structs.ValidateMetadata(v.Meta, false); err != nil {
+		b.err = multierror.Append(fmt.Errorf("invalid meta for service %s: %v", b.stringVal(v.Name), err))
+	} else {
+		meta = v.Meta
+	}
 	return &structs.ServiceDefinition{
 		ID:                b.stringVal(v.ID),
 		Name:              b.stringVal(v.Name),
 		Tags:              v.Tags,
 		Address:           b.stringVal(v.Address),
+		Meta:              meta,
 		Port:              b.intVal(v.Port),
 		Token:             b.stringVal(v.Token),
 		EnableTagOverride: b.boolVal(v.EnableTagOverride),

agent/config/config.go

@@ -319,6 +319,7 @@ type ServiceDefinition struct {
 	Name              *string           `json:"name,omitempty" hcl:"name" mapstructure:"name"`
 	Tags              []string          `json:"tags,omitempty" hcl:"tags" mapstructure:"tags"`
 	Address           *string           `json:"address,omitempty" hcl:"address" mapstructure:"address"`
+	Meta              map[string]string `json:"meta,omitempty" hcl:"meta" mapstructure:"meta"`
 	Port              *int              `json:"port,omitempty" hcl:"port" mapstructure:"port"`
 	Check             *CheckDefinition  `json:"check,omitempty" hcl:"check" mapstructure:"check"`
 	Checks            []CheckDefinition `json:"checks,omitempty" hcl:"checks" mapstructure:"checks"`

agent/config/runtime_test.go

@@ -1923,20 +1923,59 @@ func TestConfigFlagsAndEdgecases(t *testing.T) {
 			},
 			json: []string{
 				`{ "service": { "name": "a", "port": 80 } }`,
-				`{ "service": { "name": "b", "port": 90 } }`,
+				`{ "service": { "name": "b", "port": 90, "meta": {"my": "value"} } }`,
 			},
 			hcl: []string{
 				`service = { name = "a" port = 80 }`,
-				`service = { name = "b" port = 90 }`,
+				`service = { name = "b" port = 90 meta={my="value"}}`,
 			},
 			patch: func(rt *RuntimeConfig) {
 				rt.Services = []*structs.ServiceDefinition{
 					&structs.ServiceDefinition{Name: "a", Port: 80},
-					&structs.ServiceDefinition{Name: "b", Port: 90},
+					&structs.ServiceDefinition{Name: "b", Port: 90, Meta: map[string]string{"my": "value"}},
 				}
 				rt.DataDir = dataDir
 			},
 		},
+		{
+			desc: "service with wrong meta: too long key",
+			args: []string{
+				`-data-dir=` + dataDir,
+			},
+			json: []string{
+				`{ "service": { "name": "a", "port": 80, "meta": { "` + randomString(520) + `": "metaValue" } } }`,
+			},
+			hcl: []string{
+				`service = { name = "a" port = 80, meta={` + randomString(520) + `="metaValue"} }`,
+			},
+			err: `Key is too long`,
+		},
+		{
+			desc: "service with wrong meta: too long value",
+			args: []string{
+				`-data-dir=` + dataDir,
+			},
+			json: []string{
+				`{ "service": { "name": "a", "port": 80, "meta": { "a": "` + randomString(520) + `" } } }`,
+			},
+			hcl: []string{
+				`service = { name = "a" port = 80, meta={a="` + randomString(520) + `"} }`,
+			},
+			err: `Value is too long`,
+		},
+		{
+			desc: "service with wrong meta: too many meta",
+			args: []string{
+				`-data-dir=` + dataDir,
+			},
+			json: []string{
+				`{ "service": { "name": "a", "port": 80, "meta": { ` + metaPairs(70, "json") + `} } }`,
+			},
+			hcl: []string{
+				`service = { name = "a" port = 80 meta={` + metaPairs(70, "hcl") + `} }`,
+			},
+			err: `invalid meta for service a: Node metadata cannot contain more than 64 key`,
+		},
 		{
 			desc: "translated keys",
 			args: []string{
@@ -2397,6 +2436,9 @@ func TestFullConfig(t *testing.T) {
 			"service": {
 				"id": "dLOXpSCI",
 				"name": "o1ynPkp0",
+				"meta": {
+					"mymeta": "data"
+				},
 				"tags": ["nkwshvM5", "NTDWn3ek"],
 				"address": "cOlSOhbp",
 				"token": "msy7iWER",
@@ -2834,6 +2876,9 @@ func TestFullConfig(t *testing.T) {
 			service = {
 				id = "dLOXpSCI"
 				name = "o1ynPkp0"
+				meta = {
+					mymeta = "data"
+				}
 				tags = ["nkwshvM5", "NTDWn3ek"]
 				address = "cOlSOhbp"
 				token = "msy7iWER"
@@ -3487,6 +3532,7 @@ func TestFullConfig(t *testing.T) {
 				Tags:              []string{"nkwshvM5", "NTDWn3ek"},
 				Address:           "cOlSOhbp",
 				Token:             "msy7iWER",
+				Meta:              map[string]string{"mymeta": "data"},
 				Port:              24237,
 				EnableTagOverride: true,
 				Checks: structs.CheckTypes{

agent/consul/acl.go

@@ -678,6 +678,7 @@ func vetRegisterWithACL(rule acl.ACL, subj *structs.RegisterRequest,
 				ID:                subj.Service.ID,
 				Service:           subj.Service.Service,
 				Tags:              subj.Service.Tags,
+				Meta:              subj.Service.Meta,
 				Address:           subj.Service.Address,
 				Port:              subj.Service.Port,
 				EnableTagOverride: subj.Service.EnableTagOverride,

api/agent.go

@@ -23,6 +23,7 @@ type AgentService struct {
 	ID                string
 	Service           string
 	Tags              []string
+	Meta              map[string]string
 	Port              int
 	Address           string
 	EnableTagOverride bool

api/agent_test.go

@@ -73,7 +73,7 @@ func TestAPI_AgentReload(t *testing.T) {
 	agent := c.Agent()
 
 	// Update the config file with a service definition
-	config := `{"service":{"name":"redis", "port":1234}}`
+	config := `{"service":{"name":"redis", "port":1234, "Meta": {"some": "meta"}}}`
 	err = ioutil.WriteFile(configFile.Name(), []byte(config), 0644)
 	if err != nil {
 		t.Fatalf("err: %v", err)
@@ -95,6 +95,9 @@ func TestAPI_AgentReload(t *testing.T) {
 	if service.Port != 1234 {
 		t.Fatalf("bad: %v", service.Port)
 	}
+	if service.Meta["some"] != "meta" {
+		t.Fatalf("Missing metadata some:=meta in %v", service)
+	}
 }
 
 func TestAPI_AgentMembersOpts(t *testing.T) {

website/source/docs/agent/services.html.md

@@ -25,6 +25,9 @@ A service definition is a script that looks like:
     "name": "redis",
     "tags": ["primary"],
     "address": "",
+    "meta": {
+      "meta": "for my service"
+    }
     "port": 8000,
     "enable_tag_override": false,
     "checks": [
@@ -38,8 +41,8 @@ A service definition is a script that looks like:
 ```
 
 A service definition must include a `name` and may optionally provide an
-`id`, `tags`, `address`, `port`, `check`, and `enable_tag_override`. The
-`id` is set to the `name` if not provided. It is required that all
+`id`, `tags`, `address`, `port`, `check`, `meta` and `enable_tag_override`.
+The `id` is set to the `name` if not provided. It is required that all
 services have a unique ID per node, so if names might conflict then
 unique IDs should be provided.
 
@@ -57,6 +60,14 @@ The `port` field can be used as well to make a service-oriented architecture
 simpler to configure; this way, the address and port of a service can
 be discovered.
 
+The `meta` object is a map of max 64 key/values with string semantics. Key can contain
+only ASCII chars and no special characters (`A-Z` `a-z` `0-9` `_` and `-`).
+For performance and security reasons, values as well as keys are limited to 128
+characters for keys, 512 for values. This object has the same limitations as the node
+meta object in node definition.
+All those meta data can be retrieved individually per instance of the service
+and all the instances of a given service have their own copy of it.
+
 Services may also contain a `token` field to provide an ACL token. This token is
 used for any interaction with the catalog for the service, including
 [anti-entropy syncs](/docs/internals/anti-entropy.html) and deregistration.