CPAN::Mirrors - phpMan

NAME
    CPAN::Mirrors - Get CPAN mirror information and select a fast one

SYNOPSIS
        use CPAN::Mirrors;

        my $mirrors = CPAN::Mirrors->new( $mirrored_by_file );

        my $seen = {};

        my $best_continent = $mirrors->find_best_continents( { seen => $seen } );
        my @mirrors        = $mirrors->get_mirrors_by_continents( $best_continent );

        my $callback = sub {
            my( $m ) = @_;
            printf "%s = %s\n", $m->hostname, $m->rtt
            };
        $mirrors->get_mirrors_timings( \@mirrors, $seen, $callback, %args );

        @mirrors = sort { $a->rtt <=> $b->rtt } @mirrors;

        print "Best mirrors are ", map( { $_->rtt } @mirrors[0..3] ), "\n";

DESCRIPTION
    new( LOCAL_FILE_NAME )
        Create a new CPAN::Mirrors object from LOCAL_FILE_NAME. This file
        should look like that in http://www.cpan.org/MIRRORED.BY .

    continents()
        Return a list of continents based on those defined in MIRRORED.BY.

    countries( [CONTINENTS] )
        Return a list of countries based on those defined in MIRRORED.BY. It
        only returns countries for the continents you specify (as defined in
        "continents"). If you don't specify any continents, it returns all
        of the countries listed in MIRRORED.BY.

    mirrors( [COUNTRIES] )
        Return a list of mirrors based on those defined in MIRRORED.BY. It
        only returns mirrors for the countries you specify (as defined in
        "countries"). If you don't specify any countries, it returns all of
        the mirrors listed in MIRRORED.BY.

    get_mirrors_by_countries( [COUNTRIES] )
        A more sensible synonym for mirrors.

    get_mirrors_by_continents( [CONTINENTS] )
        Return a list of mirrors for all of continents you specify. If you
        don't specify any continents, it returns all of the mirrors.

        You can specify a single continent or an array reference of
        continents.

    get_countries_by_continents( [CONTINENTS] )
        A more sensible synonym for countries.

    default_mirror
        Returns the default mirror, http://www.cpan.org/ . This mirror uses
        dynamic DNS to give a close mirror.

    best_mirrors
        "best_mirrors" checks for the best mirrors based on the list of
        continents you pass, or, without that, all continents, as defined by
        "CPAN::Mirrored::By". It pings each mirror, up to the value of
        "how_many". In list context, it returns up to "how_many" mirrors. In
        scalar context, it returns the single best mirror.

        Arguments

            how_many      - the number of mirrors to return. Default: 1
            callback      - a callback for find_best_continents
            verbose       - true or false on all the whining and moaning. Default: false
            continents    - an array ref of the continents to check
            external_ping - if true, use external ping via Net::Ping::External. Default: false

        If you don't specify the continents, "best_mirrors" calls
        "find_best_continents" to get the list of continents to check.

        If you don't have Net::Ping v2.13 or later, needed for timings, this
        returns the default mirror.

        "external_ping" should be set and then "Net::Ping::External" needs
        to be installed, if the local network has a transparent proxy.

    get_n_random_mirrors_by_continents( N, [CONTINENTS] )
        Returns up to N random mirrors for the specified continents. Specify
        the continents as an array reference.

    get_mirrors_timings( MIRROR_LIST, SEEN, CALLBACK, %ARGS );
        Pings the listed mirrors and returns a list of mirrors sorted in
        ascending ping times.

        "MIRROR_LIST" is an anonymous array of "CPAN::Mirrored::By" objects
        to ping.

        The optional argument "SEEN" is a hash reference used to track the
        mirrors you've already pinged.

        The optional argument "CALLBACK" is a subroutine reference to call
        after each ping. It gets the "CPAN::Mirrored::By" object after each
        ping.

    find_best_continents( HASH_REF );
        "find_best_continents" goes through each continent and pings "N"
        random mirrors on that continent. It then orders the continents by
        ascending median ping time. In list context, it returns the ordered
        list of continent. In scalar context, it returns the same list as an
        anonymous array.

        Arguments:

            n        - the number of hosts to ping for each continent. Default: 3
            seen     - a hashref of cached hostname ping times
            verbose  - true or false for noisy or quiet. Default: false
            callback - a subroutine to run after each ping.
            ping_cache_limit - how long, in seconds, to reuse previous ping times.
                Default: 1 day

        The "seen" hash has hostnames as keys and anonymous arrays as
        values. The anonymous array is a triplet of a "CPAN::Mirrored::By"
        object, a ping time, and the epoch time for the measurement.

        The callback subroutine gets the "CPAN::Mirrored::By" object, the
        ping time, and measurement time (the same things in the "seen"
        hashref) as arguments. "find_best_continents" doesn't care what the
        callback does and ignores the return value.

        With a low value for "N", a single mirror might skew the results
        enough to choose a worse continent. If you have that problem, try a
        larger value.

AUTHOR
    Andreas Koenig "<andk AT cpan.org>", David Golden "<dagolden AT cpan.org>",
    brian d foy "<bdfoy AT cpan.org>"

LICENSE
    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

    See <http://www.perl.com/perl/misc/Artistic.html>