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   $future->on_fail( $on_error    ) if $on_error;

   return $future if defined wantarray;

   # Caller is not going to keep hold of the Future, so we have to ensure it
   # stays alive somehow
   $self->adopt_future( $future->else( sub { Future->done } ) );
}

=head2 getaddrinfo

   @addrs = $resolver->getaddrinfo( %args )->get

A shortcut wrapper around the C<getaddrinfo> resolver, taking its arguments in
a more convenient form.

=over 8

=item host => STRING

=item service => STRING

The host and service names to look up. At least one must be provided.

=item family => INT or STRING

=item socktype => INT or STRING

=item protocol => INT

Hint values used to filter the results.

=item flags => INT

Flags to control the C<getaddrinfo(3)> function. See the C<AI_*> constants in
L<Socket>'s C<getaddrinfo> function for more detail.

=item passive => BOOL

If true, sets the C<AI_PASSIVE> flag. This is provided as a convenience to
avoid the caller from having to import the C<AI_PASSIVE> constant from
C<Socket>.

=item timeout => NUMBER

Time in seconds after which to abort the lookup with a C<Timed out> exception

=back

On success, the future will yield the result as a list of HASH references;
each containing one result. Each result will contain fields called C<family>,
C<socktype>, C<protocol> and C<addr>. If requested by C<AI_CANONNAME> then the
C<canonname> field will also be present.

On failure, the detail field will give the error number, which should match
one of the C<Socket::EAI_*> constants.

 ->fail( $message, resolve => getaddrinfo => $eai_errno )

As a specific optimisation, this method will try to perform a lookup of
numeric values synchronously, rather than asynchronously, if it looks likely
to succeed.

Specifically, if the service name is entirely numeric, and the hostname looks
like an IPv4 or IPv6 string, a synchronous lookup will first be performed
using the C<AI_NUMERICHOST> flag. If this gives an C<EAI_NONAME> error, then
the lookup is performed asynchronously instead.

=head2 getaddrinfo (void)

   $resolver->getaddrinfo( %args )

When not returning a future, additional parameters can be given containing the
continuations to invoke on success or failure:

=over 8

=item on_resolved => CODE

Callback which is invoked after a successful lookup.

 $on_resolved->( @addrs )

=item on_error => CODE

Callback which is invoked after a failed lookup, including for a timeout.

 $on_error->( $exception )

=back

=cut

sub getaddrinfo
{
   my $self = shift;
   my %args = @_;

   $args{on_resolved} or defined wantarray or
      croak "Expected 'on_resolved' or to return a Future";

   $args{on_error} or defined wantarray or
      croak "Expected 'on_error' or to return a Future";

   my $host    = $args{host}    || "";
   my $service = $args{service}; defined $service or $service = "";
   my $flags   = $args{flags}   || 0;

   $flags |= AI_PASSIVE if $args{passive};

   $args{family}   = IO::Async::OS->getfamilybyname( $args{family} )     if defined $args{family};
   $args{socktype} = IO::Async::OS->getsocktypebyname( $args{socktype} ) if defined $args{socktype};

   # Clear any other existing but undefined hints
   defined $args{$_} or delete $args{$_} for keys %args;

   # It's likely this will succeed with AI_NUMERICHOST if host contains only
   # [\d.] (IPv4) or [[:xdigit:]:] (IPv6)
   # Technically we should pass AI_NUMERICSERV but not all platforms support
   # it, but since we're checking service contains only \d we should be fine.

   # These address tests don't have to be perfect as if it fails we'll get
   # EAI_NONAME and just try it asynchronously anyway
   if( ( $host =~ m/^[\d.]+$/ or $host =~ m/^[[:xdigit:]:]$/ or $host eq "" ) and