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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.net;
import ai.vespa.http.DomainName;
import ai.vespa.validation.PatternedStringWrapper;
import java.util.Optional;
import java.util.regex.Pattern;
import static ai.vespa.validation.Validation.requireLength;
/**
* Hostnames match {@link #domainNamePattern}, and are restricted to 64 characters in length.
*
* This class also has utilities for getting the hostname of the system running the JVM.
* Detection of the hostname is now done before starting any Vespa
* programs and provided in the environment variable VESPA_HOSTNAME;
* if that variable isn't set a default of "localhost" is always returned.
*
* @author arnej
* @author jonmv
*/
public class HostName extends DomainName {
private static HostName preferredHostName = null;
private HostName(String value) {
super(requireLength(value, "hostname length", 1, 64));
}
public static HostName of(String value) {
return new HostName(value);
}
/**
* Return a public and fully qualified hostname for localhost that
* resolves to an IP address on a network interface.
*
* @return the preferred name of localhost
*/
public static synchronized String getLocalhost() {
if (preferredHostName == null) {
preferredHostName = getPreferredHostName();
}
return preferredHostName.value();
}
static private HostName getPreferredHostName() {
Optional<String> vespaHostEnv = Optional.ofNullable(System.getenv("VESPA_HOSTNAME"));
if (vespaHostEnv.isPresent() && ! vespaHostEnv.get().trim().isEmpty()) {
return of(vespaHostEnv.get().trim());
}
return of("localhost");
}
public static void setHostNameForTestingOnly(String hostName) {
preferredHostName = HostName.of(hostName);
}
}
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