NATS is an OCLIB tool

tools/conf.go

@@ -0,0 +1,44 @@
+package tools
+
+import "sync"
+
+// ===================================================
+//	This class has to be updated everytime
+//	a new configuration variable is defined
+//	in a componant that imports oc-lib
+// ===================================================
+
+type Config struct {
+	NATSUrl       string
+	MongoUrl      string
+	MongoDatabase string
+}
+
+func (c Config) GetUrl() string {
+	return c.MongoUrl
+}
+
+func (c Config) GetDatabase() string {
+	return c.MongoDatabase
+}
+
+var instance *Config
+var once sync.Once
+
+func GetConfig() *Config {
+	once.Do(func() {
+		instance = &Config{}
+	})
+	return instance
+}
+
+func SetConfig(url string, database string, natsUrl string) *Config {
+	once.Do(func() {
+		instance = &Config{
+			MongoUrl:      url,
+			MongoDatabase: database,
+			NATSUrl:       natsUrl,
+		}
+	})
+	return instance
+}

tools/nats_caller.go

@@ -0,0 +1,62 @@
+package tools
+
+import (
+	"encoding/json"
+	"strings"
+
+	"github.com/nats-io/nats.go"
+)
+
+type NATSMethod int
+
+const (
+	REMOVE NATSMethod = iota
+	CREATE
+)
+
+func NameToMethod(name string) NATSMethod {
+	for _, v := range [...]NATSMethod{REMOVE, CREATE} {
+		if strings.Contains(strings.ToLower(v.String()), strings.ToLower(name)) {
+			return v
+		}
+	}
+	return -1
+}
+
+func (d NATSMethod) GenerateKey(name string) string {
+	return name + "_" + d.String()
+}
+
+func (d NATSMethod) String() string {
+	return [...]string{"remove", "create"}[d]
+}
+
+type NATSCaller struct {
+	natsUrl string
+}
+
+func NewNATSCaller(url string) *NATSCaller {
+	return &NATSCaller{
+		natsUrl: url,
+	}
+}
+
+func (o *NATSCaller) SetNATSPub(dataName string, method NATSMethod, data interface{}) string {
+	if o.natsUrl == "" {
+		return " -> NATS_SERVER is not set"
+	}
+	nc, err := nats.Connect(o.natsUrl)
+	if err != nil {
+		return " -> Could not reach NATS server : " + err.Error()
+	}
+	defer nc.Close()
+	js, err := json.Marshal(data)
+	if err != nil {
+		return " -> " + err.Error()
+	}
+	err = nc.Publish(method.GenerateKey(dataName), js)
+	if err != nil {
+		return " -> " + err.Error()
+	}
+	return ""
+}