init

Sources/BenchmarkSub/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().url(URL(string: "nats://localhost:4222")!).build()
+print("Connecting...")
+try! await nats.connect()
+print("Connected!")
+
+let data = "foo".data(using: .utf8)!
+// Warmup
+print("Starting benchmark...")
+print("Waiting for first message...")
+var now = DispatchTime.now()
+let numMsgs = 1_000_000
+let sub = try await nats.subscribe(subject: "foo").makeAsyncIterator()
+var hm = NatsHeaderMap()
+hm.append(try! NatsHeaderName("foo"), NatsHeaderValue("bar"))
+hm.append(try! NatsHeaderName("foo"), NatsHeaderValue("baz"))
+for i in 1...numMsgs {
+    let msg = try await sub.next()
+    if i == 0 {
+        print("Received first message! Starting the timer")
+        now = DispatchTime.now()
+    }
+    guard let payload = msg?.payload else {
+        print("empty payload!")
+        continue
+    }
+    if String(data: payload, encoding: .utf8) != "\(i)" {
+        let emptyString = ""
+        print(
+            "invalid payload; expected: \(i); got: \(String(data: payload, encoding: .utf8) ?? emptyString)"
+        )
+    }
+    guard msg?.headers != nil else {
+        print("empty headers!")
+        continue
+    }
+    if i % 1000 == 0 {
+        print("received \(i) msgs")
+    }
+}
+
+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")