init

Sources/BenchmarkPubSub/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
+
+let nats = NatsClientOptions().urls([URL(string: "nats://localhost:4222")!]).build()
+print("Connecting...")
+try! await nats.connect()
+print("Connected!")
+
+let data = "foo".data(using: .utf8)!
+// Warmup
+print("Warming up...")
+for _ in 0..<10_000 {
+    try! await nats.publish(data, subject: "foo")
+}
+print("Starting benchmark...")
+let now = DispatchTime.now()
+let numMsgs = 1_000_000
+let sub = try await nats.subscribe(subject: "foo")
+try await withThrowingTaskGroup(of: Void.self) { group in
+    group.addTask {
+        var hm = NatsHeaderMap()
+        hm.append(try! NatsHeaderName("foo"), NatsHeaderValue("bar"))
+        hm.append(try! NatsHeaderName("foo"), NatsHeaderValue("baz"))
+        hm.insert(try! NatsHeaderName("another"), NatsHeaderValue("one"))
+        var i = 0
+        for try await msg in sub {
+            let payload = msg.payload!
+            if String(data: payload, encoding: .utf8) != "\(i)" {
+                let emptyString = ""
+                print(
+                    "invalid payload; expected: \(i); got: \(String(data: payload, encoding: .utf8) ?? emptyString)"
+                )
+            }
+            guard let headers = msg.headers else {
+                print("empty headers!")
+                continue
+            }
+            if headers != hm {
+                print("invalid headers; expected: \(hm); got: \(headers)")
+            }
+            if i % 1000 == 0 {
+                print("received \(i) msgs")
+            }
+            i += 1
+        }
+    }
+
+    group.addTask {
+        var hm = NatsHeaderMap()
+        hm.append(try! NatsHeaderName("foo"), NatsHeaderValue("bar"))
+        hm.append(try! NatsHeaderName("foo"), NatsHeaderValue("baz"))
+        hm.insert(try! NatsHeaderName("another"), NatsHeaderValue("one"))
+        for i in 0..<numMsgs {
+            try await nats.publish("\(i)".data(using: .utf8)!, subject: "foo", headers: hm)
+            if i % 1000 == 0 {
+                print("published \(i) msgs")
+            }
+        }
+    }
+
+    // Wait for all tasks in the group to complete
+    try await group.waitForAll()
+}
+
+try! await nats.flush()
+let elapsed = DispatchTime.now().uptimeNanoseconds - now.uptimeNanoseconds
+let msgsPerSec: Double = Double(numMsgs) / (Double(elapsed) / 1_000_000_000)
+print("Elapsed: \(elapsed / 1_000_000)ms")
+print("\(msgsPerSec) msgs/s")