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add support for URLSession (on Apple Platforms); refactor ping client (…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,216 @@ | ||
| // | ||
| // This source file is part of the LCL open source project | ||
| // | ||
| // Copyright (c) 2021-2024 Local Connectivity Lab and the project authors | ||
| // Licensed under Apache License v2.0 | ||
| // | ||
| // See LICENSE for license information | ||
| // See CONTRIBUTORS for the list of project authors | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
|
|
||
| import Foundation | ||
| import NIOCore | ||
| import NIO | ||
| import NIOHTTP1 | ||
| import NIOSSL | ||
| import NIOConcurrencyHelpers | ||
|
|
||
| final class NIOHTTPClient: Pingable { | ||
| private let eventLoopGroup: EventLoopGroup | ||
| private let configuration: HTTPPingClient.Configuration | ||
| private let resultPromise: EventLoopPromise<PingSummary> | ||
|
|
||
| private var state: PingState | ||
| private var channels: NIOLockedValueBox<[Channel]> | ||
| private var responses: NIOLockedValueBox<[PingResponse]> | ||
| private var resolvedAddress: SocketAddress? | ||
| private let stateLock = NIOLock() | ||
|
|
||
| #if INTEGRATION_TEST | ||
| private var networkLinkConfig: TrafficControllerChannelHandler.NetworkLinkConfiguration? | ||
| #endif | ||
|
|
||
| public init(eventLoopGroup: EventLoopGroup, | ||
| configuration: HTTPPingClient.Configuration, | ||
| resolvedAddress: SocketAddress, | ||
| promise: EventLoopPromise<PingSummary>) { | ||
| self.eventLoopGroup = eventLoopGroup | ||
| self.resultPromise = promise | ||
| self.resolvedAddress = resolvedAddress | ||
| self.state = .ready | ||
| self.configuration = configuration | ||
| self.channels = .init([]) | ||
| self.responses = .init([]) | ||
| } | ||
|
|
||
| #if INTEGRATION_TEST | ||
| convenience init(eventLoopGroup: EventLoopGroup, | ||
| configuration: HTTPPingClient.Configuration, | ||
| resolvedAddress: SocketAddress, | ||
| networkLinkConfig: TrafficControllerChannelHandler.NetworkLinkConfiguration?, | ||
| promise: EventLoopPromise<PingSummary>) { | ||
| self.init(eventLoopGroup: eventLoopGroup, configuration: configuration, resolvedAddress: resolvedAddress, promise: promise) | ||
| self.networkLinkConfig = networkLinkConfig | ||
| } | ||
| #endif | ||
|
|
||
| deinit { | ||
| self.shutdown() | ||
| } | ||
|
|
||
| func start() throws -> EventLoopFuture<PingSummary> { | ||
| return self.stateLock.withLock { | ||
| switch self.state { | ||
| case .ready: | ||
| self.state = .running | ||
| guard let resolvedAddress = self.resolvedAddress else { | ||
| self.resultPromise.fail(PingError.httpMissingHost) | ||
| self.state = .error | ||
| return self.resultPromise.futureResult | ||
| } | ||
| for cnt in 0..<self.configuration.count { | ||
| let promise = self.eventLoopGroup.next().makePromise(of: PingResponse.self) | ||
| self.connect(to: resolvedAddress, promise: promise).whenComplete { result in | ||
| switch result { | ||
| case .success(let channel): | ||
| self.channels.withLockedValue { channels in | ||
| channels.append(channel) | ||
| } | ||
|
|
||
| logger.debug("Scheduled #\(cnt) request") | ||
| channel.eventLoop.scheduleTask(in: self.configuration.readTimeout * cnt) { | ||
| let request = self.configuration.makeHTTPRequest(for: cnt) | ||
| channel.write(request, promise: nil) | ||
| } | ||
| case .failure(let error): | ||
| promise.fail(error) | ||
| self.stateLock.withLockVoid { | ||
| self.state = .error | ||
| } | ||
| } | ||
| } | ||
|
|
||
| promise.futureResult.whenComplete { res in | ||
| self.channels.withLockedValue { channels in | ||
| if !channels.isEmpty { | ||
| channels.removeFirst() | ||
| } | ||
| } | ||
| switch res { | ||
| case .success(let response): | ||
| self.responses.withLockedValue { | ||
| $0.append(response) | ||
| if $0.count == self.configuration.count { | ||
| self.resultPromise.succeed($0.summarize(host: resolvedAddress)) | ||
| } | ||
| } | ||
| case .failure(let error): | ||
| self.resultPromise.fail(error) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return self.resultPromise.futureResult.always { result in | ||
| switch result { | ||
| case .success: | ||
| self.stateLock.withLockVoid { | ||
| self.state = .finished | ||
| } | ||
| case .failure: | ||
| self.stateLock.withLockVoid { | ||
| self.state = .error | ||
| } | ||
| } | ||
| } | ||
| default: | ||
| preconditionFailure("Cannot run HTTP NIO Ping when the client is not in ready state.") | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public func cancel() { | ||
| self.stateLock.withLockVoid { | ||
| switch self.state { | ||
| case .ready: | ||
| self.state = .canceled | ||
| self.resultPromise.fail(PingError.taskIsCancelled) | ||
| case .running: | ||
| self.state = .canceled | ||
| guard let resolvedAddress = self.resolvedAddress else { | ||
| self.resultPromise.fail(PingError.httpMissingHost) | ||
| return | ||
| } | ||
| self.responses.withLockedValue { | ||
| self.resultPromise.succeed($0.summarize(host: resolvedAddress)) | ||
| } | ||
| shutdown() | ||
| case .error: | ||
| logger.debug("[\(#fileID)][\(#line)][\(#function)]: No need to cancel when HTTP Client is in error state.") | ||
| case .canceled: | ||
| logger.debug("[\(#fileID)][\(#line)][\(#function)]: No need to cancel when HTTP Client is in canceled state.") | ||
| case .finished: | ||
| logger.debug("[\(#fileID)][\(#line)][\(#function)]: No need to cancel when test is finished.") | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func connect(to address: SocketAddress, | ||
| promise: EventLoopPromise<PingResponse>) -> EventLoopFuture<Channel> { | ||
| return makeBootstrap(address, promise: promise).connect(to: address) | ||
| } | ||
|
|
||
| private func makeBootstrap(_ resolvedAddress: SocketAddress, | ||
| promise: EventLoopPromise<PingResponse>) -> ClientBootstrap { | ||
| return ClientBootstrap(group: self.eventLoopGroup) | ||
| .channelOption(ChannelOptions.socketOption(.so_reuseaddr), value: 1) | ||
| .connectTimeout(self.configuration.connectionTimeout) | ||
| .channelInitializer { channel in | ||
| if self.configuration.schema.enableTLS { | ||
| do { | ||
| let tlsConfiguration = TLSConfiguration.makeClientConfiguration() | ||
| let sslContext = try NIOSSLContext(configuration: tlsConfiguration) | ||
| let tlsHandler = try NIOSSLClientHandler(context: sslContext, | ||
| serverHostname: self.configuration.host) | ||
| try channel.pipeline.syncOperations.addHandlers(tlsHandler) | ||
| } catch { | ||
| return channel.eventLoop.makeFailedFuture(error) | ||
| } | ||
| } | ||
|
|
||
| do { | ||
| try channel.pipeline.syncOperations.addHTTPClientHandlers(position: .last) | ||
| try channel.pipeline.syncOperations.addHandler( | ||
| HTTPTracingHandler(configuration: self.configuration, promise: promise), | ||
| position: .last | ||
| ) | ||
|
|
||
| #if INTEGRATION_TEST | ||
| guard let networkLinkConfig = self.networkLinkConfig else { | ||
| preconditionFailure("Test should initialize NetworkLinkConfiguration") | ||
| } | ||
| try channel.pipeline.syncOperations.addHandler( | ||
| TrafficControllerChannelHandler(networkLinkConfig: networkLinkConfig), | ||
| position: .first | ||
| ) | ||
| #endif | ||
| } catch { | ||
| return channel.eventLoop.makeFailedFuture(error) | ||
| } | ||
|
|
||
| return channel.eventLoop.makeSucceededVoidFuture() | ||
| } | ||
| } | ||
|
|
||
| private func shutdown() { | ||
| self.channels.withLockedValue { channels in | ||
| channels.forEach { channel in | ||
| channel.close(mode: .all).whenFailure { error in | ||
| logger.error("Cannot close HTTP Ping Client: \(error)") | ||
| } | ||
| } | ||
| logger.debug("Shutdown!") | ||
| } | ||
| } | ||
| } |
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