wehub-resource-sync
e84fb4a79e
container project - merge build / Invoke build (push) Successful in 1s
60 lines
2.0 KiB
Swift
60 lines
2.0 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 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 ContainerizationError
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import ContainerizationExtras
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actor AttachmentAllocator {
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private let allocator: any AddressAllocator<UInt32>
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private var hostnames: [String: UInt32] = [:]
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init(lower: UInt32, size: Int) throws {
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allocator = try UInt32.rotatingAllocator(
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lower: lower,
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size: UInt32(size)
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)
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}
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/// Allocate a network address for a host.
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func allocate(hostname: String) async throws -> UInt32 {
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// Client is responsible for ensuring two containers don't use same hostname, so provide existing IP if hostname exists
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if let index = hostnames[hostname] {
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return index
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}
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let index = try allocator.allocate()
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hostnames[hostname] = index
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return index
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}
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/// Free an allocated network address by hostname.
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@discardableResult
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func deallocate(hostname: String) async throws -> UInt32? {
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guard let index = hostnames.removeValue(forKey: hostname) else {
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return nil
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}
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try allocator.release(index)
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return index
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}
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/// Retrieve the allocator index for a hostname.
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func lookup(hostname: String) async throws -> UInt32? {
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hostnames[hostname]
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}
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}
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