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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
#if os(Linux) || os(FreeBSD) || os(Android)
import CNIOLinux
#endif
#if os(Windows)
import let WinSDK.RelationProcessorCore
import let WinSDK.AF_UNSPEC
import let WinSDK.ERROR_SUCCESS
import func WinSDK.GetAdaptersAddresses
import func WinSDK.GetLastError
import func WinSDK.GetLogicalProcessorInformation
import struct WinSDK.IP_ADAPTER_ADDRESSES
import struct WinSDK.IP_ADAPTER_UNICAST_ADDRESS
import struct WinSDK.SYSTEM_LOGICAL_PROCESSOR_INFORMATION
import struct WinSDK.ULONG
import typealias WinSDK.DWORD
#endif
/// A utility function that runs the body code only in debug builds, without
/// emitting compiler warnings.
///
/// This is currently the only way to do this in Swift: see
/// https://forums.swift.org/t/support-debug-only-code/11037 for a discussion.
@inlinable
internal func debugOnly(_ body: () -> Void) {
assert({ body(); return true }())
}
/// Allows to "box" another value.
final class Box<T> {
let value: T
init(_ value: T) { self.value = value }
}
public enum System {
/// A utility function that returns an estimate of the number of *logical* cores
/// on the system.
///
/// This value can be used to help provide an estimate of how many threads to use with
/// the `MultiThreadedEventLoopGroup`. The exact ratio between this number and the number
/// of threads to use is a matter for the programmer, and can be determined based on the
/// specific execution behaviour of the program.
///
/// - returns: The logical core count on the system.
public static var coreCount: Int {
#if os(Windows)
var dwLength: DWORD = 0
_ = GetLogicalProcessorInformation(nil, &dwLength)
let alignment: Int =
MemoryLayout<SYSTEM_LOGICAL_PROCESSOR_INFORMATION>.alignment
let pBuffer: UnsafeMutableRawPointer =
UnsafeMutableRawPointer.allocate(byteCount: Int(dwLength),
alignment: alignment)
defer {
pBuffer.deallocate()
}
let dwSLPICount: Int =
Int(dwLength) / MemoryLayout<SYSTEM_LOGICAL_PROCESSOR_INFORMATION>.stride
let pSLPI: UnsafeMutablePointer<SYSTEM_LOGICAL_PROCESSOR_INFORMATION> =
pBuffer.bindMemory(to: SYSTEM_LOGICAL_PROCESSOR_INFORMATION.self,
capacity: dwSLPICount)
let bResult: Bool = GetLogicalProcessorInformation(pSLPI, &dwLength)
precondition(bResult, "GetLogicalProcessorInformation: \(GetLastError())")
return UnsafeBufferPointer<SYSTEM_LOGICAL_PROCESSOR_INFORMATION>(start: pSLPI,
count: dwSLPICount)
.filter { $0.Relationship == RelationProcessorCore }
.map { $0.ProcessorMask.nonzeroBitCount }
.reduce(0, +)
#elseif os(Linux) || os(Android)
if let quota = Linux.coreCount(quota: Linux.cfsQuotaPath, period: Linux.cfsPeriodPath) {
return quota
} else if let cpusetCount = Linux.coreCount(cpuset: Linux.cpuSetPath) {
return cpusetCount
} else {
return sysconf(CInt(_SC_NPROCESSORS_ONLN))
}
#else
return sysconf(CInt(_SC_NPROCESSORS_ONLN))
#endif
}
#if !os(Windows)
/// A utility function that enumerates the available network interfaces on this machine.
///
/// This function returns values that are true for a brief snapshot in time. These results can
/// change, and the returned values will not change to reflect them. This function must be called
/// again to get new results.
///
/// - returns: An array of network interfaces available on this machine.
/// - throws: If an error is encountered while enumerating interfaces.
@available(*, deprecated, renamed: "enumerateDevices")
public static func enumerateInterfaces() throws -> [NIONetworkInterface] {
var interfaces: [NIONetworkInterface] = []
interfaces.reserveCapacity(12) // Arbitrary choice.
var interface: UnsafeMutablePointer<ifaddrs>? = nil
try Posix.getifaddrs(&interface)
let originalInterface = interface
defer {
freeifaddrs(originalInterface)
}
while let concreteInterface = interface {
if let nioInterface = NIONetworkInterface(concreteInterface.pointee) {
interfaces.append(nioInterface)
}
interface = concreteInterface.pointee.ifa_next
}
return interfaces
}
#endif
/// A utility function that enumerates the available network devices on this machine.
///
/// This function returns values that are true for a brief snapshot in time. These results can
/// change, and the returned values will not change to reflect them. This function must be called
/// again to get new results.
///
/// - returns: An array of network devices available on this machine.
/// - throws: If an error is encountered while enumerating interfaces.
public static func enumerateDevices() throws -> [NIONetworkDevice] {
var devices: [NIONetworkDevice] = []
devices.reserveCapacity(12) // Arbitrary choice.
#if os(Windows)
var ulSize: ULONG = 0
_ = GetAdaptersAddresses(ULONG(AF_UNSPEC), 0, nil, nil, &ulSize)
let stride: Int = MemoryLayout<IP_ADAPTER_ADDRESSES>.stride
let pBuffer: UnsafeMutableBufferPointer<IP_ADAPTER_ADDRESSES> =
UnsafeMutableBufferPointer.allocate(capacity: Int(ulSize) / stride)
defer {
pBuffer.deallocate()
}
let ulResult: ULONG =
GetAdaptersAddresses(ULONG(AF_UNSPEC), 0, nil, pBuffer.baseAddress,
&ulSize)
guard ulResult == ERROR_SUCCESS else {
throw IOError(windows: ulResult, reason: "GetAdaptersAddresses")
}
var pAdapter: UnsafeMutablePointer<IP_ADAPTER_ADDRESSES>? =
UnsafeMutablePointer(pBuffer.baseAddress)
while pAdapter != nil {
let pUnicastAddresses: UnsafeMutablePointer<IP_ADAPTER_UNICAST_ADDRESS>? =
pAdapter!.pointee.FirstUnicastAddress
var pUnicastAddress: UnsafeMutablePointer<IP_ADAPTER_UNICAST_ADDRESS>? =
pUnicastAddresses
while pUnicastAddress != nil {
if let device = NIONetworkDevice(pAdapter!, pUnicastAddress!) {
devices.append(device)
}
pUnicastAddress = pUnicastAddress!.pointee.Next
}
pAdapter = pAdapter!.pointee.Next
}
#else
var interface: UnsafeMutablePointer<ifaddrs>? = nil
try Posix.getifaddrs(&interface)
let originalInterface = interface
defer {
freeifaddrs(originalInterface)
}
while let concreteInterface = interface {
if let nioInterface = NIONetworkDevice(concreteInterface.pointee) {
devices.append(nioInterface)
}
interface = concreteInterface.pointee.ifa_next
}
#endif
return devices
}
}
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