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.\" ========================================================================
.\"
.IX Title "CPAN::Mirrors 3"
.TH CPAN::Mirrors 3 "2018-11-27" "perl v5.16.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
CPAN::Mirrors \- Get CPAN mirror information and select a fast one
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    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\en", $m\->hostname, $m\->rtt
\&        };
\&    $mirrors\->get_mirrors_timings( \e@mirrors, $seen, $callback );
\&
\&    @mirrors = sort { $a\->rtt <=> $b\->rtt } @mirrors;
\&
\&    print "Best mirrors are ", map( { $_\->rtt } @mirrors[0..3] ), "\en";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
.IP "new( \s-1LOCAL_FILE_NAME \s0)" 4
.IX Item "new( LOCAL_FILE_NAME )"
Create a new CPAN::Mirrors object from \s-1LOCAL_FILE_NAME.\s0 This file
should look like that in http://www.cpan.org/MIRRORED.BY .
.IP "\fIcontinents()\fR" 4
.IX Item "continents()"
Return a list of continents based on those defined in \fI\s-1MIRRORED.BY\s0\fR.
.IP "countries( [\s-1CONTINENTS\s0] )" 4
.IX Item "countries( [CONTINENTS] )"
Return a list of countries based on those defined in \fI\s-1MIRRORED.BY\s0\fR.
It only returns countries for the continents you specify (as defined
in \f(CW\*(C`continents\*(C'\fR). If you don't specify any continents, it returns all
of the countries listed in \fI\s-1MIRRORED.BY\s0\fR.
.IP "mirrors( [\s-1COUNTRIES\s0] )" 4
.IX Item "mirrors( [COUNTRIES] )"
Return a list of mirrors based on those defined in \fI\s-1MIRRORED.BY\s0\fR.
It only returns mirrors for the countries you specify (as defined
in \f(CW\*(C`countries\*(C'\fR). If you don't specify any countries, it returns all
of the mirrors listed in \fI\s-1MIRRORED.BY\s0\fR.
.IP "get_mirrors_by_countries( [\s-1COUNTRIES\s0] )" 4
.IX Item "get_mirrors_by_countries( [COUNTRIES] )"
A more sensible synonym for mirrors.
.IP "get_mirrors_by_continents( [\s-1CONTINENTS\s0] )" 4
.IX Item "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.
.Sp
You can specify a single continent or an array reference of continents.
.IP "get_countries_by_continents( [\s-1CONTINENTS\s0] )" 4
.IX Item "get_countries_by_continents( [CONTINENTS] )"
A more sensible synonym for countries.
.IP "default_mirror" 4
.IX Item "default_mirror"
Returns the default mirror, http://www.cpan.org/ . This mirror uses
dynamic \s-1DNS\s0 to give a close mirror.
.IP "best_mirrors" 4
.IX Item "best_mirrors"
\&\f(CW\*(C`best_mirrors\*(C'\fR checks for the best mirrors based on the list of
continents you pass, or, without that, all continents, as defined
by \f(CW\*(C`CPAN::Mirrored::By\*(C'\fR. It pings each mirror, up to the value of
\&\f(CW\*(C`how_many\*(C'\fR. In list context, it returns up to \f(CW\*(C`how_many\*(C'\fR mirror.
In scalar context, it returns the single best mirror.
.Sp
Arguments
.Sp
.Vb 4
\&    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
.Ve
.Sp
If you don't specify the continents, \f(CW\*(C`best_mirrors\*(C'\fR calls
\&\f(CW\*(C`find_best_continents\*(C'\fR to get the list of continents to check.
.Sp
If you don't have Net::Ping v2.13 or later, needed for timings,
this returns the default mirror.
.IP "get_n_random_mirrors_by_continents( N, [\s-1CONTINENTS\s0] )" 4
.IX Item "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.
.IP "get_mirrors_timings( \s-1MIRROR_LIST, SEEN, CALLBACK \s0);" 4
.IX Item "get_mirrors_timings( MIRROR_LIST, SEEN, CALLBACK );"
Pings the listed mirrors and returns a list of mirrors sorted in
ascending ping times.
.Sp
\&\f(CW\*(C`MIRROR_LIST\*(C'\fR is an anonymous array of \f(CW\*(C`CPAN::Mirrored::By\*(C'\fR objects to
ping.
.Sp
The optional argument \f(CW\*(C`SEEN\*(C'\fR is a hash reference used to track the
mirrors you've already pinged.
.Sp
The optional argument \f(CW\*(C`CALLBACK\*(C'\fR is a subroutine reference to call
after each ping. It gets the \f(CW\*(C`CPAN::Mirrored::By\*(C'\fR object after each
ping.
.IP "find_best_continents( \s-1HASH_REF \s0);" 4
.IX Item "find_best_continents( HASH_REF );"
\&\f(CW\*(C`find_best_continents\*(C'\fR goes through each continent and pings \f(CW\*(C`N\*(C'\fR
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.
.Sp
Arguments:
.Sp
.Vb 6
\&    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
.Ve
.Sp
The \f(CW\*(C`seen\*(C'\fR hash has hostnames as keys and anonymous arrays as values.
The anonymous array is a triplet of a \f(CW\*(C`CPAN::Mirrored::By\*(C'\fR object, a
ping time, and the epoch time for the measurement.
.Sp
The callback subroutine gets the \f(CW\*(C`CPAN::Mirrored::By\*(C'\fR object, the ping
time, and measurement time (the same things in the \f(CW\*(C`seen\*(C'\fR hashref) as
arguments. \f(CW\*(C`find_best_continents\*(C'\fR doesn't care what the callback does
and ignores the return value.
.Sp
With a low value for \f(CW\*(C`N\*(C'\fR, a single mirror might skew the results enough
to choose a worse continent. If you have that problem, try a larger
value.
.SH "AUTHOR"
.IX Header "AUTHOR"
Andreas Koenig \f(CW\*(C`<andk@cpan.org>\*(C'\fR, David Golden \f(CW\*(C`<dagolden@cpan.org>\*(C'\fR,
brian d foy \f(CW\*(C`<bdfoy@cpan.org>\*(C'\fR
.SH "LICENSE"
.IX Header "LICENSE"
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.PP
See <http://www.perl.com/perl/misc/Artistic.html>