fix: add basic JetStream management; bump: nats.go v1.12.3 (BREAKING to use with nack)

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020 jar3b
+Copyright (c) 2021 jar3b
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,2 +1,42 @@
 # nacl
+
 Client helper for NATS/STAN
+
+## examples
+
+connect to NATS
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/jar3b/grawt"
+    "github.com/jar3b/nacl"
+    "github.com/kelseyhightower/envconfig"
+)
+
+func main() {
+    // get params
+    conf := config.NewConfig()
+
+	// init waiter (github.com/jar3b/grawt)
+	var waiter = grawt.NewWaiter()
+
+	// init nats
+	var subscriptions []*nacl.NatsSubscription
+	if err := nacl.SetupNats(conf.Nats.Host, conf.Nats.Port, conf.Nats.User, conf.Nats.Pass,
+		// handler called before app closed
+        // we need to terminate sub's properly and sometimes doing another actions (finalizers)
+        waiter.AddCloseHandler(func() {
+			nacl.FinalizeNats(&subscriptions)
+		}, false),
+	); err != nil {
+		waiter.Halt(fmt.Errorf("cannot connect to nats: %v", err))
+	}
+	defer nacl.NatsClient.Close()
+	
+    // here we add some subscriptions and wait (using blocking call)
+    // ...
+}
+```

go.mod

@@ -1,12 +1,23 @@
 module github.com/jar3b/nacl
 
-go 1.13
+go 1.17
 
 require (
-	github.com/jar3b/grawt v0.1.5
+	github.com/jar3b/grawt v0.1.10
-	github.com/nats-io/nats-server/v2 v2.1.2 // indirect
+	github.com/nats-io/nats.go v1.12.3
-	github.com/nats-io/nats-streaming-server v0.16.2 // indirect
+	github.com/nats-io/stan.go v0.10.0
-	github.com/nats-io/nats.go v1.9.1
+)
-	github.com/nats-io/stan.go v0.6.0
+
-	github.com/sirupsen/logrus v1.4.2
+require (
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/nats-io/nats-server/v2 v2.6.1 // indirect
+	github.com/nats-io/nats-streaming-server v0.22.1 // indirect
+	github.com/nats-io/nkeys v0.3.0 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	github.com/sirupsen/logrus v1.8.1 // indirect
+	github.com/stretchr/testify v1.3.0 // indirect
+	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
+	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
 )

go.sum

@@ -0,0 +1,161 @@
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jetstream.go

@@ -0,0 +1,75 @@
+package nacl
+
+import (
+	"fmt"
+	"github.com/jar3b/grawt"
+	"github.com/nats-io/nats.go"
+	"log"
+)
+
+var (
+	JsClient nats.JetStreamContext
+)
+
+func SetupJetStream(host string, port int, credsFile string, closeHandler *grawt.CloseHandler, opts ...nats.JSOpt) error {
+	var err error
+	if err := SetupNatsWithCreds(host, port, credsFile, closeHandler); err != nil {
+		return err
+	}
+
+	JsClient, err = NatsClient.JetStream(opts...)
+	if err != nil {
+		return fmt.Errorf("cannot init JS: %v", err)
+	}
+
+	return nil
+}
+
+func FinalizeJetStream(subscriptions *[]*nats.Subscription) error {
+	return FinalizeNats(subscriptions)
+}
+
+func AddOrUpdateStream(cfg *nats.StreamConfig, opts ...nats.JSOpt) (*nats.StreamInfo, error) {
+	_, err := JsClient.StreamInfo("metric-stream")
+	if err != nil && err.Error() != "nats: stream not found" {
+		return nil, err
+	}
+
+	if err == nil {
+		sc, err := JsClient.UpdateStream(cfg, opts...)
+		if err != nil {
+			return nil, err
+		}
+		return sc, nil
+	} else {
+		sc, err := JsClient.AddStream(cfg, opts...)
+		if err != nil {
+			return nil, err
+		}
+		return sc, nil
+	}
+}
+
+func AddOrUpdateConsumer(stream string, consumer string, cfg *nats.ConsumerConfig, allowDelete bool, opts ...nats.JSOpt) (*nats.ConsumerInfo, error) {
+	ci0, err := JsClient.ConsumerInfo(stream, consumer, opts...)
+	if err != nil && err.Error() != "nats: consumer not found" {
+		return nil, err
+	}
+
+	if err == nil && allowDelete {
+		if err := JsClient.DeleteConsumer(stream, consumer, opts...); err != nil {
+			return nil, err
+		}
+	}
+
+	ci, err := JsClient.AddConsumer(stream, cfg, opts...)
+	if err != nil {
+		if !allowDelete {
+			log.Printf("Consumer '%s' was exists", consumer)
+			return ci0, nil
+		} else {
+			return nil, err
+		}
+	}
+	return ci, nil
+}

nacl.go

@@ -5,21 +5,44 @@ import (
 	"github.com/jar3b/grawt"
 	"github.com/nats-io/nats.go"
 	"github.com/nats-io/stan.go"
+	"sync"
 	"time"
 )
 
 var (
 	NatsClient *nats.Conn
 	StanClient stan.Conn
+	natsLock   = sync.Mutex{}
+	stanLock   = sync.Mutex{}
 )
 
-type (
+func SetupNatsWithCreds(host string, port int, credsFile string, closeHandler *grawt.CloseHandler) error {
-	Msg          = stan.Msg
+	natsLock.Lock()
-	NatsMsg      = nats.Msg
+	defer natsLock.Unlock()
-	Subscription = stan.Subscription
+	var err error
-)
+
+	// connect
+	NatsClient, err = nats.Connect(
+		fmt.Sprintf("nats://%s:%d", host, port),
+		nats.UserCredentials(credsFile),
+		nats.ClosedHandler(func(conn *nats.Conn) {
+			if closeHandler != nil {
+				closeHandler.Halt(nil)
+			}
+		}),
+		nats.MaxReconnects(5),
+		nats.ReconnectWait(time.Second*2),
+	)
+	if err != nil {
+		return fmt.Errorf("cannot connect to NATS: %v", err)
+	}
+
+	return nil
+}
 
 func SetupNats(host string, port int, user string, pass string, closeHandler *grawt.CloseHandler) error {
+	natsLock.Lock()
+	defer natsLock.Unlock()
 	var err error
 
 	// init connection string
@@ -33,7 +56,9 @@ func SetupNats(host string, port int, user string, pass string, closeHandler *gr
 	NatsClient, err = nats.Connect(
 		connectionString,
 		nats.ClosedHandler(func(conn *nats.Conn) {
+			if closeHandler != nil {
 				closeHandler.Halt(nil)
+			}
 		}),
 		nats.MaxReconnects(5),
 		nats.ReconnectWait(time.Second*2),
@@ -46,6 +71,9 @@ func SetupNats(host string, port int, user string, pass string, closeHandler *gr
 }
 
 func SetupStan(clusterName string, clientId string, host string, port int, user string, pass string, closeHandler *grawt.CloseHandler) (err error) {
+	stanLock.Lock()
+	defer stanLock.Unlock()
+
 	if err = SetupNats(host, port, user, pass, closeHandler); err != nil {
 		return err
 	}
@@ -63,10 +91,18 @@ func SetupStan(clusterName string, clientId string, host string, port int, user
 	return nil
 }
 
-func FinalizeStan(subscriptions *[]Subscription) error {
+func FinalizeStan(subscriptions *[]stan.Subscription) error {
+	stanLock.Lock()
+	defer stanLock.Unlock()
+	if StanClient == nil {
+		return fmt.Errorf("stan client is not initialized")
+	}
+
+	if subscriptions != nil {
 		for _, subscription := range *subscriptions {
 			_ = subscription.Unsubscribe()
 		}
+	}
 
 	if err := StanClient.Close(); err != nil {
 		return fmt.Errorf("cannot disconnect from STAN")
@@ -74,3 +110,21 @@ func FinalizeStan(subscriptions *[]Subscription) error {
 
 	return nil
 }
+
+func FinalizeNats(subscriptions *[]*nats.Subscription) error {
+	natsLock.Lock()
+	defer natsLock.Unlock()
+	if NatsClient == nil {
+		return fmt.Errorf("stan client is not initialized")
+	}
+
+	if subscriptions != nil {
+		for _, subscription := range *subscriptions {
+			_ = subscription.Unsubscribe()
+		}
+	}
+
+	NatsClient.Close()
+
+	return nil
+}