feat: actually working jetstream connection, typescript sender mock script

docker-compose.yaml

···
     ports:
       - "8222:8222"
       - "4222:4222"
+    volumes:
+      - ./nats-dev-server.conf:/nats-server.conf
+    command: ["-c", "/nats-server.conf"]

go.mod

···
 	github.com/nats-io/nkeys v0.4.7 // indirect
 	github.com/nats-io/nuid v1.0.1 // indirect
 	golang.org/x/crypto v0.18.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
 )
 
 require (

go.sum

···
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
-golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
-golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=

nats-dev-server.conf

···
+# nats-server.conf
+jetstream {
+  enabled: true
+}

package-lock.json

···
 {
-  "name": "churros-notella",
+  "name": "notella",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
···
         "@prisma/client": "^5.20.0"
       },
       "devDependencies": {
-        "prisma": "^5.20.0"
+        "nats": "^2.28.2",
+        "prisma": "^5.20.0",
+        "tsx": "^4.19.2"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.23.1.tgz",
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+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.23.1.tgz",
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+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
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+      ],
+      "engines": {
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+      }
+    },
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/android-x64": {
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+      ],
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+      "engines": {
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+      "dev": true,
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+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
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+      "hasInstallScript": true,
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···
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "nkeys.js": "1.1.0"
+      },
+      "engines": {
+        "node": ">= 14.0.0"
+      }
+    },
+    "node_modules/nkeys.js": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/nkeys.js/-/nkeys.js-1.1.0.tgz",
+      "integrity": "sha512-tB/a0shZL5UZWSwsoeyqfTszONTt4k2YS0tuQioMOD180+MbombYVgzDUYHlx+gejYK6rgf08n/2Df99WY0Sxg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "tweetnacl": "1.0.3"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/prisma": {
       "version": "5.20.0",
       "resolved": "https://registry.npmjs.org/prisma/-/prisma-5.20.0.tgz",
···
       "optionalDependencies": {
         "fsevents": "2.3.3"
       }
+    },
+    "node_modules/resolve-pkg-maps": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
+      "integrity": "sha512-seS2Tj26TBVOC2NIc2rOe2y2ZO7efxITtLZcGSOnHHNOQ7CkiUBfw0Iw2ck6xkIhPwLhKNLS8BO+hEpngQlqzw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
+      }
+    },
+    "node_modules/tsx": {
+      "version": "4.19.2",
+      "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.19.2.tgz",
+      "integrity": "sha512-pOUl6Vo2LUq/bSa8S5q7b91cgNSjctn9ugq/+Mvow99qW6x/UZYwzxy/3NmqoT66eHYfCVvFvACC58UBPFf28g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "~0.23.0",
+        "get-tsconfig": "^4.7.5"
+      },
+      "bin": {
+        "tsx": "dist/cli.mjs"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      }
+    },
+    "node_modules/tweetnacl": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-1.0.3.tgz",
+      "integrity": "sha512-6rt+RN7aOi1nGMyC4Xa5DdYiukl2UWCbcJft7YhxReBGQD7OAM8Pbxw6YMo4r2diNEA8FEmu32YOn9rhaiE5yw==",
+      "dev": true,
+      "license": "Unlicense"
     }
   }
 }

package.json

···
 {
   "devDependencies": {
-    "prisma": "^5.20.0"
+    "nats": "^2.28.2",
+    "prisma": "^5.20.0",
+    "tsx": "^4.19.2"
   },
   "dependencies": {
     "@prisma/client": "^5.20.0"

receiver.go

···
 package notella
 
 import (
-	"github.com/nats-io/nats.go/jetstream"
+	ll "github.com/ewen-lbh/label-logger-go"
+	"github.com/nats-io/nats.go"
 )
 
-func NatsReceiver(m jetstream.Msg) {
-
+func NatsReceiver(m *nats.Msg) {
+	ll.Log("Received", "cyan", "message: %s", string(m.Data))
 }

scripts/mocksender.ts

···
+import { connect, StringCodec, JetStreamManager, NatsConnection } from "nats"
+
+async function setupStream(
+  jetStreamManager: JetStreamManager,
+  streamName: string,
+  subject: string
+) {
+  try {
+    // Try to add the stream (will not recreate if it exists)
+    await jetStreamManager.streams.add({
+      name: streamName,
+      subjects: [subject],
+    })
+    console.log(`Stream '${streamName}' created or already exists.`)
+  } catch (err) {
+    console.error(`Error setting up stream: ${err.message}`)
+  }
+}
+
+async function publishMessages(
+  nc: NatsConnection,
+  subject: string,
+  messageCount: number,
+  delayMs: number
+) {
+  const js = nc.jetstream()
+  const sc = StringCodec()
+
+  for (let i = 1; i <= messageCount; i++) {
+    const message = `Mock Order #${i}`
+    await js.publish(subject, sc.encode(message))
+    console.log(`Sent message: ${message}`)
+    await new Promise((resolve) => setTimeout(resolve, delayMs))
+  }
+}
+
+async function main() {
+  const streamName = "notella:stream"
+  const subject = "notella:notification"
+
+  // Connect to the NATS server
+  const nc = await connect({ servers: "localhost:4222" })
+  console.log("Connected to NATS")
+
+  // Create a JetStream manager to manage streams
+  const jsm = await nc.jetstreamManager()
+
+  // Ensure the stream exists
+  await setupStream(jsm, streamName, subject)
+
+  // Publish messages at intervals
+  const messageCount = 20
+  const delayMs = 1000 // 1 second delay between messages
+  await publishMessages(nc, subject, messageCount, delayMs)
+
+  console.log("Finished sending messages.")
+  await nc.close()
+}
+
+main().catch((err) => {
+  console.error(`Error in sender: ${err.message}`)
+})

server/main.go

···
 import (
 	"context"
 	"fmt"
+	"log"
 	"os"
 	"os/signal"
 	"syscall"
···
 	ll "github.com/ewen-lbh/label-logger-go"
 	"github.com/joho/godotenv"
 	"github.com/nats-io/nats.go"
-	"github.com/nats-io/nats.go/jetstream"
 )
 
 type Configuration struct {
···
 }
 
 var Version = "DEV"
+
+const StreamName = "notella:stream"
+const SubjectName = "notella:notification"
 
 func main() {
 	figure.NewColorFigure("Notella", "", "yellow", true).Print()
···
 		return
 	}
 
-	ctx, cancel := context.WithTimeout(context.Background(), 30 * time.Second)
-	defer cancel()
-
-	js, err := jetstream.New(nc)
+	js, err := nc.JetStream()
 	if err != nil {
 		ll.ErrorDisplay("could not connect to Jetstream", err)
 		return
 	}
 
-	ll.Log("Initializing", "cyan", "a Jetstream stream [bold]notella:stream[reset], listening for [bold]notella:*[reset] subjects")
+	ll.Log("Initializing", "cyan", "a Jetstream stream [bold]%s[reset], listening for subject [bold]%s[reset]", StreamName, SubjectName)
 
-	s, err := js.CreateStream(ctx, jetstream.StreamConfig{
-		Name:     "notella:stream",
-		Subjects: []string{"notella:*"},
+	_, err = js.AddStream(&nats.StreamConfig{
+		Name:     StreamName,
+		Subjects: []string{SubjectName},
 	})
 	if err != nil {
 		ll.ErrorDisplay("could not create stream", err)
···
 
 	ll.Log("Initializing", "cyan", "Jetstream consumer [bold]NotellaConsumer[reset] with [bold]AckExplicitPolicy[reset]")
 
-	cons, err := s.CreateOrUpdateConsumer(ctx, jetstream.ConsumerConfig{
+	_, err = js.AddConsumer(StreamName, &nats.ConsumerConfig{
 		Durable:   "NotellaConsumer",
-		AckPolicy: jetstream.AckExplicitPolicy,
+		AckPolicy: nats.AckExplicitPolicy,
 	})
 	if err != nil {
 		ll.ErrorDisplay("could not create consumer", err)
···
 
 	ll.Log("Starting", "cyan", "consumer [bold]NotellaConsumer[reset]")
 
-	cc, err := cons.Consume(func(msg jetstream.Msg) {
-		fmt.Println(string(msg.Data()))
-		msg.Ack()
-	}, jetstream.ConsumeErrHandler(func(consumeCtx jetstream.ConsumeContext, err error) {
-		fmt.Println(err)
-	}))
+	sub, err := js.PullSubscribe(SubjectName, "NotellaConsumer")
 	if err != nil {
 		ll.ErrorDisplay("could not start consumer", err)
 		return
 	}
-	defer cc.Stop()
+
+	// Setup a context to handle graceful shutdowns
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	// Capture OS signals for graceful shutdown
+	go func() {
+		sigChan := make(chan os.Signal, 1)
+		signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+		<-sigChan
+		log.Println("Received shutdown signal, shutting down...")
+		cancel()
+	}()
+
+	// Continuously fetch and process messages
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			default:
+				// Fetch messages in batches
+				msgs, err := sub.Fetch(10, nats.MaxWait(5*time.Second))
+				if err != nil && err != nats.ErrTimeout {
+					log.Printf("Error fetching messages: %v", err)
+					time.Sleep(2 * time.Second) // Wait before retrying
+					continue
+				}
 
-	sig := make(chan os.Signal, 1)
-	signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
-	<-sig
+				// Process each message
+				for _, msg := range msgs {
+					log.Printf("Processing message: %s", string(msg.Data))
+					// Simulate notification scheduling
+					notella.NatsReceiver(msg)
+					msg.Ack() // Acknowledge the message
+				}
+			}
+		}
+	}()
+
+	// Block until the context is canceled (i.e., server shutdown signal received)
+	<-ctx.Done()
+	log.Println("Server stopped.")
 }