jvmMain.okhttp3.internal.connection.InetAddressOrder.kt Maven / Gradle / Ivy
/*
* Copyright (C) 2022 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okhttp3.internal.connection
import java.net.Inet6Address
import java.net.InetAddress
import okhttp3.internal.interleave
/**
* Implementation of HappyEyeballs Sorting Addresses.
*
* The current implementation does not address any of:
* - Async DNS split by IP class
* - Stateful handling of connectivity results
* - The prioritisation of addresses
*
* https://datatracker.ietf.org/doc/html/rfc8305#section-4
*/
fun reorderForHappyEyeballs(addresses: List): List {
if (addresses.size < 2) {
return addresses
}
val (ipv6, ipv4) = addresses.partition { it is Inet6Address }
return if (ipv6.isEmpty() || ipv4.isEmpty()) {
addresses
} else {
interleave(ipv6, ipv4)
}
}