add a separate configuration struct for pool

Package.swift

@@ -21,7 +21,7 @@ let package = Package(
         .library(name: "AsyncHTTPClient", targets: ["AsyncHTTPClient"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-nio.git", from: "2.18.0"),
+        .package(url: "https://github.com/apple/swift-nio.git", from: "2.19.0"),
         .package(url: "https://github.com/apple/swift-nio-ssl.git", from: "2.8.0"),
         .package(url: "https://github.com/apple/swift-nio-extras.git", from: "1.3.0"),
         .package(url: "https://github.com/apple/swift-nio-transport-services.git", from: "1.5.1"),

Sources/AsyncHTTPClient/ConnectionPool.swift

@@ -353,7 +353,7 @@ class HTTP1ConnectionProvider {
         case .park(let connection):
             logger.trace("parking connection",
                          metadata: ["ahc-connection": "\(connection)"])
-            connection.setIdleTimeout(timeout: self.configuration.maximumAllowedIdleTimeInConnectionPool,
+            connection.setIdleTimeout(timeout: self.configuration.poolConfiguration.idleTimeout,
                                       logger: self.backgroundActivityLogger)
         case .closeProvider:
             logger.debug("closing provider",
@@ -365,7 +365,7 @@ class HTTP1ConnectionProvider {
             logger.trace("parking connection & doing further action",
                          metadata: ["ahc-connection": "\(connection)",
                                     "ahc-action": "\(action)"])
-            connection.setIdleTimeout(timeout: self.configuration.maximumAllowedIdleTimeInConnectionPool,
+            connection.setIdleTimeout(timeout: self.configuration.poolConfiguration.idleTimeout,
                                       logger: self.backgroundActivityLogger)
             self.execute(action, logger: logger)
         case .closeAnd(let connection, let action):

Sources/AsyncHTTPClient/HTTPClient.swift

@@ -641,8 +641,8 @@ public class HTTPClient {
         public var redirectConfiguration: RedirectConfiguration
         /// Default client timeout, defaults to no timeouts.
         public var timeout: Timeout
-        /// Timeout of pooled connections
-        public var maximumAllowedIdleTimeInConnectionPool: Optional<TimeAmount>
+        /// Connection pool configuration.
+        public var poolConfiguration: PoolConfiguration
         /// Upstream proxy, defaults to no proxy.
         public var proxy: Proxy?
         /// Enables automatic body decompression. Supported algorithms are gzip and deflate.
@@ -653,14 +653,14 @@ public class HTTPClient {
         public init(tlsConfiguration: TLSConfiguration? = nil,
                     redirectConfiguration: RedirectConfiguration? = nil,
                     timeout: Timeout = Timeout(),
-                    maximumAllowedIdleTimeInConnectionPool: TimeAmount,
+                    poolConfiguration: PoolConfiguration = PoolConfiguration(),
                     proxy: Proxy? = nil,
                     ignoreUncleanSSLShutdown: Bool = false,
                     decompression: Decompression = .disabled) {
             self.tlsConfiguration = tlsConfiguration
             self.redirectConfiguration = redirectConfiguration ?? RedirectConfiguration()
             self.timeout = timeout
-            self.maximumAllowedIdleTimeInConnectionPool = maximumAllowedIdleTimeInConnectionPool
+            self.poolConfiguration = poolConfiguration
             self.proxy = proxy
             self.ignoreUncleanSSLShutdown = ignoreUncleanSSLShutdown
             self.decompression = decompression
@@ -676,7 +676,7 @@ public class HTTPClient {
                 tlsConfiguration: tlsConfiguration,
                 redirectConfiguration: redirectConfiguration,
                 timeout: timeout,
-                maximumAllowedIdleTimeInConnectionPool: .seconds(60),
+                poolConfiguration: PoolConfiguration(),
                 proxy: proxy,
                 ignoreUncleanSSLShutdown: ignoreUncleanSSLShutdown,
                 decompression: decompression
@@ -693,7 +693,7 @@ public class HTTPClient {
             self.init(tlsConfiguration: TLSConfiguration.forClient(certificateVerification: certificateVerification),
                       redirectConfiguration: redirectConfiguration,
                       timeout: timeout,
-                      maximumAllowedIdleTimeInConnectionPool: maximumAllowedIdleTimeInConnectionPool,
+                      poolConfiguration: PoolConfiguration(),
                       proxy: proxy,
                       ignoreUncleanSSLShutdown: ignoreUncleanSSLShutdown,
                       decompression: decompression)
@@ -702,15 +702,15 @@ public class HTTPClient {
         public init(certificateVerification: CertificateVerification,
                     redirectConfiguration: RedirectConfiguration? = nil,
                     timeout: Timeout = Timeout(),
-                    maximumAllowedIdleTimeInConnectionPool: TimeAmount = .seconds(60),
+                    poolConfiguration: TimeAmount = .seconds(60),
                     proxy: Proxy? = nil,
                     ignoreUncleanSSLShutdown: Bool = false,
                     decompression: Decompression = .disabled,
                     backgroundActivityLogger: Logger?) {
             self.init(tlsConfiguration: TLSConfiguration.forClient(certificateVerification: certificateVerification),
                       redirectConfiguration: redirectConfiguration,
                       timeout: timeout,
-                      maximumAllowedIdleTimeInConnectionPool: maximumAllowedIdleTimeInConnectionPool,
+                      poolConfiguration: PoolConfiguration(),
                       proxy: proxy,
                       ignoreUncleanSSLShutdown: ignoreUncleanSSLShutdown,
                       decompression: decompression)
@@ -811,7 +811,7 @@ public class HTTPClient {
 }
 
 extension HTTPClient.Configuration {
-    /// Timeout configuration
+    /// Timeout configuration.
     public struct Timeout {
         /// Specifies connect timeout.
         public var connect: TimeAmount?
@@ -860,6 +860,16 @@ extension HTTPClient.Configuration {
         /// - warning: Cycle detection will keep all visited URLs in memory which means a malicious server could use this as a denial-of-service vector.
         public static func follow(max: Int, allowCycles: Bool) -> RedirectConfiguration { return .init(configuration: .follow(max: max, allowCycles: allowCycles)) }
     }
+
+    /// Connection pool configuration.
+    public struct PoolConfiguration: Hashable {
+        // Specifies amount of time connections are kept idle in the pool.
+        public var idleTimeout: TimeAmount
+
+        public init(idleTimeout: TimeAmount = .seconds(60)) {
+            self.idleTimeout = idleTimeout
+        }
+    }
 }
 
 extension ChannelPipeline {

Tests/AsyncHTTPClientTests/HTTPClientTests.swift

@@ -1742,7 +1742,7 @@ class HTTPClientTests: XCTestCase {
 
     func testPoolClosesIdleConnections() {
         let localClient = HTTPClient(eventLoopGroupProvider: .shared(self.clientGroup),
-                                     configuration: .init(maximumAllowedIdleTimeInConnectionPool: .milliseconds(100)))
+                                     configuration: .init(poolConfiguration: .init(idleTimeout: .milliseconds(100))))
         defer {
             XCTAssertNoThrow(try localClient.syncShutdown())
         }
@@ -1753,7 +1753,7 @@ class HTTPClientTests: XCTestCase {
 
     func testRacePoolIdleConnectionsAndGet() {
         let localClient = HTTPClient(eventLoopGroupProvider: .shared(self.clientGroup),
-                                     configuration: .init(maximumAllowedIdleTimeInConnectionPool: .milliseconds(10)))
+                                     configuration: .init(poolConfiguration: .init(idleTimeout: .milliseconds(10))))
         defer {
             XCTAssertNoThrow(try localClient.syncShutdown())
         }