wehub-resource-sync
e84fb4a79e
container project - merge build / Invoke build (push) Successful in 1s
122 lines
3.3 KiB
Swift
122 lines
3.3 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025-2026 Apple Inc. and the container project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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import NIOCore
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final class GlueHandler {
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private var partner: GlueHandler?
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private var context: ChannelHandlerContext?
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private var pendingRead: Bool = false
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private init() {}
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}
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extension GlueHandler {
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static func matchedPair() -> (GlueHandler, GlueHandler) {
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let first = GlueHandler()
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let second = GlueHandler()
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first.partner = second
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second.partner = first
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return (first, second)
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}
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}
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extension GlueHandler {
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private func partnerWrite(_ data: NIOAny) {
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self.context?.write(data, promise: nil)
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}
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private func partnerFlush() {
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self.context?.flush()
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}
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private func partnerWriteEOF() {
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self.context?.close(mode: .output, promise: nil)
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}
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private func partnerCloseFull() {
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self.context?.close(promise: nil)
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}
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private func partnerBecameWritable() {
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if self.pendingRead {
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self.pendingRead = false
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self.context?.read()
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}
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}
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private var partnerWritable: Bool {
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self.context?.channel.isWritable ?? false
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}
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}
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extension GlueHandler: ChannelDuplexHandler {
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typealias InboundIn = NIOAny
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typealias OutboundIn = NIOAny
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typealias OutboundOut = NIOAny
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func handlerAdded(context: ChannelHandlerContext) {
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self.context = context
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}
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func handlerRemoved(context: ChannelHandlerContext) {
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self.context = nil
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self.partner = nil
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}
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func channelRead(context: ChannelHandlerContext, data: NIOAny) {
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self.partner?.partnerWrite(data)
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}
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func channelReadComplete(context: ChannelHandlerContext) {
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self.partner?.partnerFlush()
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}
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func channelInactive(context: ChannelHandlerContext) {
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self.partner?.partnerCloseFull()
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}
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func userInboundEventTriggered(context: ChannelHandlerContext, event: Any) {
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if let event = event as? ChannelEvent, case .inputClosed = event {
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// We have read EOF.
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self.partner?.partnerWriteEOF()
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}
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}
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func errorCaught(context: ChannelHandlerContext, error: Error) {
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self.partner?.partnerCloseFull()
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}
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func channelWritabilityChanged(context: ChannelHandlerContext) {
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if context.channel.isWritable {
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self.partner?.partnerBecameWritable()
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}
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}
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func read(context: ChannelHandlerContext) {
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if let partner = self.partner, partner.partnerWritable {
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context.read()
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} else {
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self.pendingRead = true
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}
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}
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}
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