CPAN::Mirrors(3perl) Perl Programmers Reference Guide CPAN::Mirrors(3perl)
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@cpan.org>", David Golden "<dagolden@cpan.org>",
brian d foy "<bdfoy@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>
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