Initial project setup - Phases 1-3 complete

ProxyCore/Sources/ProxyEngine/ProxyServer.swift

@@ -0,0 +1,55 @@
+import Foundation
+import NIOCore
+import NIOPosix
+import NIOHTTP1
+
+public final class ProxyServer: Sendable {
+    private let host: String
+    private let port: Int
+    private let group: EventLoopGroup
+    private let trafficRepo: TrafficRepository
+    nonisolated(unsafe) private var channel: Channel?
+
+    public init(
+        host: String = ProxyConstants.proxyHost,
+        port: Int = ProxyConstants.proxyPort,
+        trafficRepo: TrafficRepository = TrafficRepository()
+    ) {
+        self.host = host
+        self.port = port
+        // Use only 1 thread to conserve memory in the extension (50MB budget)
+        self.group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
+        self.trafficRepo = trafficRepo
+    }
+
+    public func start() async throws {
+        let trafficRepo = self.trafficRepo
+
+        let bootstrap = ServerBootstrap(group: group)
+            .serverChannelOption(.backlog, value: 256)
+            .serverChannelOption(.socketOption(.so_reuseaddr), value: 1)
+            .childChannelInitializer { channel in
+                channel.pipeline.addHandler(
+                    ByteToMessageHandler(HTTPRequestDecoder(leftOverBytesStrategy: .forwardBytes))
+                ).flatMap {
+                    channel.pipeline.addHandler(HTTPResponseEncoder())
+                }.flatMap {
+                    channel.pipeline.addHandler(ConnectHandler(trafficRepo: trafficRepo))
+                }
+            }
+            .childChannelOption(.socketOption(.so_reuseaddr), value: 1)
+            .childChannelOption(.maxMessagesPerRead, value: 16)
+
+        channel = try await bootstrap.bind(host: host, port: port).get()
+        print("[ProxyServer] Listening on \(host):\(port)")
+    }
+
+    public func stop() async {
+        do {
+            try await channel?.close()
+            try await group.shutdownGracefully()
+        } catch {
+            print("[ProxyServer] Shutdown error: \(error)")
+        }
+    }
+}