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Sources/Nats/RttCommand.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 NIOCore
+
+internal class RttCommand {
+    let startTime = DispatchTime.now()
+    let promise: EventLoopPromise<TimeInterval>?
+
+    static func makeFrom(channel: Channel?) -> RttCommand {
+        RttCommand(promise: channel?.eventLoop.makePromise(of: TimeInterval.self))
+    }
+
+    private init(promise: EventLoopPromise<TimeInterval>?) {
+        self.promise = promise
+    }
+
+    func setRoundTripTime() {
+        let now = DispatchTime.now()
+        let nanoTime = now.uptimeNanoseconds - startTime.uptimeNanoseconds
+        let rtt = TimeInterval(nanoTime) / 1_000_000_000  // Convert nanos to seconds
+        promise?.succeed(rtt)
+    }
+
+    func getRoundTripTime() async throws -> TimeInterval {
+        try await promise?.futureResult.get() ?? 0
+    }
+}