Use receiver names from config (#34)

* Use common configuration format of 'receiver_name' -> 'receiver_config'

* Adjust receiver configuration files

.github/ci-receivers.json

@@ -1 +1 @@
-[]
+{}

receivers.json

@@ -1,8 +1,8 @@
-[
-    {
+{
+    "natsrecv" : {
         "type": "nats",
         "address": "nats://my-url",
         "port" : "4222",
         "database": "testcluster"
     }
-]
+}

receivers/metricReceiver.go

@@ -2,9 +2,15 @@ package receivers
 
 import (
 	//	"time"
+	"encoding/json"
+
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
 )
 
+type defaultReceiverConfig struct {
+	Type string `json:"type"`
+}
+
 type ReceiverConfig struct {
 	Addr         string `json:"address"`
 	Port         string `json:"port"`
@@ -14,16 +20,13 @@ type ReceiverConfig struct {
 }
 
 type receiver struct {
+	typename string
 	name     string
-	addr         string
-	port         string
-	database     string
-	organization string
 	sink     chan lp.CCMetric
 }
 
 type Receiver interface {
-	Init(config ReceiverConfig) error
+	Init(name string, config json.RawMessage) error
 	Start()
 	Close()
 	Name() string

receivers/natsReceiver.go

@@ -1,19 +1,22 @@
 package receivers
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
+	"time"
+
+	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
 	influx "github.com/influxdata/line-protocol"
 	nats "github.com/nats-io/nats.go"
-	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
-	"time"
 )
 
 type NatsReceiverConfig struct {
+	Type    string `json:"type"`
 	Addr    string `json:"address"`
 	Port    string `json:"port"`
-	Database string `json:"database"`
+	Subject string `json:"subject"`
 }
 
 type NatsReceiver struct {
@@ -22,35 +25,35 @@ type NatsReceiver struct {
 	handler *influx.MetricHandler
 	parser  *influx.Parser
 	meta    map[string]string
-	config  ReceiverConfig
+	config  NatsReceiverConfig
 }
 
 var DefaultTime = func() time.Time {
 	return time.Unix(42, 0)
 }
 
-func (r *NatsReceiver) Init(config ReceiverConfig) error {
-	r.name = "NatsReceiver"
-	r.config = config
+func (r *NatsReceiver) Init(name string, config json.RawMessage) error {
+	r.typename = "NatsReceiver"
+	r.name = name
+	r.config.Addr = nats.DefaultURL
+	r.config.Port = "4222"
+	if len(config) > 0 {
+		err := json.Unmarshal(config, &r.config)
+		if err != nil {
+			cclog.ComponentError(r.name, "Error reading config:", err.Error())
+			return err
+		}
+	}
 	if len(r.config.Addr) == 0 ||
 		len(r.config.Port) == 0 ||
-		len(r.config.Database) == 0 {
-		return errors.New("Not all configuration variables set required by NatsReceiver")
+		len(r.config.Subject) == 0 {
+		return errors.New("not all configuration variables set required by NatsReceiver")
 	}
 	r.meta = map[string]string{"source": r.name}
-	r.addr = r.config.Addr
-	if len(r.addr) == 0 {
-		r.addr = nats.DefaultURL
-	}
-	r.port = r.config.Port
-	if len(r.port) == 0 {
-		r.port = "4222"
-	}
-	uri := fmt.Sprintf("%s:%s", r.addr, r.port)
-	cclog.ComponentDebug("NatsReceiver", "INIT", uri)
+	uri := fmt.Sprintf("%s:%s", r.config.Addr, r.config.Port)
+	cclog.ComponentDebug(r.name, "INIT", uri, "Subject", r.config.Subject)
 	nc, err := nats.Connect(uri)
 	if err == nil {
-		r.database = r.config.Database
 		r.nc = nc
 	} else {
 		r.nc = nil
@@ -63,8 +66,8 @@ func (r *NatsReceiver) Init(config ReceiverConfig) error {
 }
 
 func (r *NatsReceiver) Start() {
-	cclog.ComponentDebug("NatsReceiver", "START")
-	r.nc.Subscribe(r.database, r._NatsReceive)
+	cclog.ComponentDebug(r.name, "START")
+	r.nc.Subscribe(r.config.Subject, r._NatsReceive)
 }
 
 func (r *NatsReceiver) _NatsReceive(m *nats.Msg) {
@@ -84,7 +87,7 @@ func (r *NatsReceiver) _NatsReceive(m *nats.Msg) {
 
 func (r *NatsReceiver) Close() {
 	if r.nc != nil {
-		cclog.ComponentDebug("NatsReceiver", "CLOSE")
+		cclog.ComponentDebug(r.name, "CLOSE")
 		r.nc.Close()
 	}
 }

receivers/receiveManager.go

@@ -18,12 +18,12 @@ type receiveManager struct {
 	output chan lp.CCMetric
 	done   chan bool
 	wg     *sync.WaitGroup
-	config []ReceiverConfig
+	config []json.RawMessage
 }
 
 type ReceiveManager interface {
 	Init(wg *sync.WaitGroup, receiverConfigFile string) error
-	AddInput(rawConfig json.RawMessage) error
+	AddInput(name string, rawConfig json.RawMessage) error
 	AddOutput(output chan lp.CCMetric)
 	Start()
 	Close()
@@ -34,7 +34,7 @@ func (rm *receiveManager) Init(wg *sync.WaitGroup, receiverConfigFile string) er
 	rm.output = nil
 	rm.done = make(chan bool)
 	rm.wg = wg
-	rm.config = make([]ReceiverConfig, 0)
+	rm.config = make([]json.RawMessage, 0)
 	configFile, err := os.Open(receiverConfigFile)
 	if err != nil {
 		cclog.ComponentError("ReceiveManager", err.Error())
@@ -42,14 +42,14 @@ func (rm *receiveManager) Init(wg *sync.WaitGroup, receiverConfigFile string) er
 	}
 	defer configFile.Close()
 	jsonParser := json.NewDecoder(configFile)
-	var rawConfigs []json.RawMessage
+	var rawConfigs map[string]json.RawMessage
 	err = jsonParser.Decode(&rawConfigs)
 	if err != nil {
 		cclog.ComponentError("ReceiveManager", err.Error())
 		return err
 	}
-	for _, raw := range rawConfigs {
-		rm.AddInput(raw)
+	for name, raw := range rawConfigs {
+		rm.AddInput(name, raw)
 	}
 	return nil
 }
@@ -64,8 +64,8 @@ func (rm *receiveManager) Start() {
 	cclog.ComponentDebug("ReceiveManager", "STARTED")
 }
 
-func (rm *receiveManager) AddInput(rawConfig json.RawMessage) error {
-	var config ReceiverConfig
+func (rm *receiveManager) AddInput(name string, rawConfig json.RawMessage) error {
+	var config defaultReceiverConfig
 	err := json.Unmarshal(rawConfig, &config)
 	if err != nil {
 		cclog.ComponentError("ReceiveManager", "SKIP", config.Type, "JSON config error:", err.Error())
@@ -76,13 +76,13 @@ func (rm *receiveManager) AddInput(rawConfig json.RawMessage) error {
 		return err
 	}
 	r := AvailableReceivers[config.Type]
-	err = r.Init(config)
+	err = r.Init(name, rawConfig)
 	if err != nil {
 		cclog.ComponentError("ReceiveManager", "SKIP", r.Name(), "initialization failed:", err.Error())
 		return err
 	}
 	rm.inputs = append(rm.inputs, r)
-	rm.config = append(rm.config, config)
+	rm.config = append(rm.config, rawConfig)
 	cclog.ComponentDebug("ReceiveManager", "ADD RECEIVER", r.Name())
 	return nil
 }