init

Sources/Example/main.swift

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+// Copyright 2024 The NATS Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+import Nats
+
+print("\n### Setup NATS Connection")
+
+let nats = NatsClientOptions()
+    .url(URL(string: "nats://localhost:4222")!)
+    .build()
+
+nats.on(.connected) { event in
+    print("event: connected")
+}
+
+print("connecting...")
+try await nats.connect()
+
+print("\n### Publish / Subscribe")
+
+print("subscribing...")
+let sub = try await nats.subscribe(subject: "foo.>")
+
+let loop = Task {
+    print("starting message loop...")
+
+    for try await msg in sub {
+
+        if msg.subject == "foo.done" {
+            break
+        }
+
+        if let payload = msg.payload {
+            print("received \(msg.subject): \(String(data: payload, encoding: .utf8) ?? "")")
+        }
+
+        if let headers = msg.headers {
+            if let headerValue = headers.get(try! NatsHeaderName("X-Example")) {
+                print("  header: X-Example: \(headerValue.description)")
+            }
+        }
+    }
+
+    print("message loop done...")
+}
+
+print("publishing data...")
+for i in 1...3 {
+    var headers = NatsHeaderMap()
+    headers.append(try! NatsHeaderName("X-Example"), NatsHeaderValue("example value"))
+
+    if let data = "data\(i)".data(using: .utf8) {
+        try await nats.publish(data, subject: "foo.\(i)", headers: headers)
+    }
+}
+
+print("signalling done...")
+try await nats.publish(Data(), subject: "foo.done")
+
+try await loop.value
+
+print("closing...")
+try await nats.close()
+
+print("bye")