1CPAN::Mirrors(3) User Contributed Perl Documentation CPAN::Mirrors(3)
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6 CPAN::Mirrors - Get CPAN mirror information and select a fast one
7
9 use CPAN::Mirrors;
10 my $mirrors = CPAN::Mirrors->new( $mirrored_by_file );
12 my $seen = {};
14 my $best_continent = $mirrors->find_best_continents( { seen => $seen } );
16 my @mirrors = $mirrors->get_mirrors_by_continents( $best_continent );
17 my $callback = sub {
19 my( $m ) = @_;
20 printf "%s = %s\n", $m->hostname, $m->rtt
21 };
22 $mirrors->get_mirrors_timings( \@mirrors, $seen, $callback );
23 @mirrors = sort { $a->rtt <=> $b->rtt } @mirrors;
25 print "Best mirrors are ", map( { $_->rtt } @mirrors[0..3] ), "\n";
27
29 new( LOCAL_FILE_NAME )
30 Create a new CPAN::Mirrors object from LOCAL_FILE_NAME. This file
31 should look like that in http://www.cpan.org/MIRRORED.BY .
32 continents()
34 Return a list of continents based on those defined in MIRRORED.BY.
35 countries( [CONTINENTS] )
37 Return a list of countries based on those defined in MIRRORED.BY.
38 It only returns countries for the continents you specify (as
39 defined in "continents"). If you don't specify any continents, it
40 returns all of the countries listed in MIRRORED.BY.
41 mirrors( [COUNTRIES] )
43 Return a list of mirrors based on those defined in MIRRORED.BY. It
44 only returns mirrors for the countries you specify (as defined in
45 "countries"). If you don't specify any countries, it returns all of
46 the mirrors listed in MIRRORED.BY.
47 get_mirrors_by_countries( [COUNTRIES] )
49 A more sensible synonym for mirrors.
50 get_mirrors_by_continents( [CONTINENTS] )
52 Return a list of mirrors for all of continents you specify. If you
53 don't specify any continents, it returns all of the mirrors.
54 You can specify a single continent or an array reference of
56 continents.
57 get_countries_by_continents( [CONTINENTS] )
59 A more sensible synonym for countries.
60 default_mirror
62 Returns the default mirror, http://www.cpan.org/ . This mirror uses
63 dynamic DNS to give a close mirror.
64 best_mirrors
66 "best_mirrors" checks for the best mirrors based on the list of
67 continents you pass, or, without that, all continents, as defined
68 by "CPAN::Mirrored::By". It pings each mirror, up to the value of
69 "how_many". In list context, it returns up to "how_many" mirror.
70 In scalar context, it returns the single best mirror.
71 Arguments
73 how_many - the number of mirrors to return. Default: 1
75 callback - a callback for find_best_continents
76 verbose - true or false on all the whining and moaning. Default: false
77 continents - an array ref of the continents to check
78 If you don't specify the continents, "best_mirrors" calls
80 "find_best_continents" to get the list of continents to check.
81 If you don't have Net::Ping v2.13 or later, needed for timings,
83 this returns the default mirror.
84 get_n_random_mirrors_by_continents( N, [CONTINENTS] )
86 Returns up to N random mirrors for the specified continents.
87 Specify the continents as an array reference.
88 get_mirrors_timings( MIRROR_LIST, SEEN, CALLBACK );
90 Pings the listed mirrors and returns a list of mirrors sorted in
91 ascending ping times.
92 "MIRROR_LIST" is an anonymous array of "CPAN::Mirrored::By" objects
94 to ping.
95 The optional argument "SEEN" is a hash reference used to track the
97 mirrors you've already pinged.
98 The optional argument "CALLBACK" is a subroutine reference to call
100 after each ping. It gets the "CPAN::Mirrored::By" object after each
101 ping.
102 find_best_continents( HASH_REF );
104 "find_best_continents" goes through each continent and pings "N"
105 random mirrors on that continent. It then orders the continents by
106 ascending median ping time. In list context, it returns the ordered
107 list of continent. In scalar context, it returns the same list as
108 an anonymous array.
109 Arguments:
111 n - the number of hosts to ping for each continent. Default: 3
113 seen - a hashref of cached hostname ping times
114 verbose - true or false for noisy or quiet. Default: false
115 callback - a subroutine to run after each ping.
116 ping_cache_limit - how long, in seconds, to reuse previous ping times.
117 Default: 1 day
118 The "seen" hash has hostnames as keys and anonymous arrays as
120 values. The anonymous array is a triplet of a "CPAN::Mirrored::By"
121 object, a ping time, and the epoch time for the measurement.
122 The callback subroutine gets the "CPAN::Mirrored::By" object, the
124 ping time, and measurement time (the same things in the "seen"
125 hashref) as arguments. "find_best_continents" doesn't care what the
126 callback does and ignores the return value.
127 With a low value for "N", a single mirror might skew the results
129 enough to choose a worse continent. If you have that problem, try a
130 larger value.
131
133 Andreas Koenig "<andk@cpan.org>", David Golden "<dagolden@cpan.org>",
134 brian d foy "<bdfoy@cpan.org>"
135
137 This program is free software; you can redistribute it and/or modify it
138 under the same terms as Perl itself.
139 See <http://www.perl.com/perl/misc/Artistic.html>
141perl v5.28.1 2019-03-19 CPAN::Mirrors(3)