package CPANPLUS::Internals::Fetch;
use strict;
use CPANPLUS::Error;
use CPANPLUS::Internals::Constants;
use File::Fetch;
use File::Spec;
use Cwd qw[cwd];
use IPC::Cmd qw[run];
use Params::Check qw[check];
use Module::Load::Conditional qw[can_load];
use Locale::Maketext::Simple Class => 'CPANPLUS', Style => 'gettext';
$Params::Check::VERBOSE = 1;
=pod
=head1 NAME
CPANPLUS::Internals::Fetch
=head1 SYNOPSIS
my $output = $cb->_fetch(
module => $modobj,
fetchdir => '/path/to/save/to',
verbose => BOOL,
force => BOOL,
);
$cb->_add_fail_host( host => 'foo.com' );
$cb->_host_ok( host => 'foo.com' );
=head1 DESCRIPTION
CPANPLUS::Internals::Fetch fetches files from either ftp, http, file
or rsync mirrors.
This is the rough flow:
$cb->_fetch
Delegate to File::Fetch;
=head1 METHODS
=cut
=head1 $path = _fetch( module => $modobj, [fetchdir => '/path/to/save/to', fetch_from => 'scheme://path/to/fetch/from', verbose => BOOL, force => BOOL, prefer_bin => BOOL, ttl => $seconds] )
C<_fetch> will fetch files based on the information in a module
object. You always need a module object. If you want a fake module
object for a one-off fetch, look at C<CPANPLUS::Module::Fake>.
C<fetchdir> is the place to save the file to. Usually this
information comes from your configuration, but you can override it
expressly if needed.
C<fetch_from> lets you specify an URI to get this file from. If you
do not specify one, your list of configured hosts will be probed to
download the file from.
C<force> forces a new download, even if the file already exists.
C<verbose> simply indicates whether or not to print extra messages.
C<prefer_bin> indicates whether you prefer the use of commandline
programs over perl modules. Defaults to your corresponding config
setting.
C<ttl> (in seconds) indicates how long a cached copy is valid for. If
the fetch time of the local copy is within the ttl, the cached copy is
returned. Otherwise, the file is refetched.
C<_fetch> figures out, based on the host list, what scheme to use and
from there, delegates to C<File::Fetch> do the actual fetching.
Returns the path of the output file on success, false on failure.
Note that you can set a C<blacklist> on certain methods in the config.
Simply add the identifying name of the method (ie, C<lwp>) to:
$conf->_set_fetch( blacklist => ['lwp'] );
And the C<LWP> function will be skipped by C<File::Fetch>.
=cut
sub _fetch {
my $self = shift;
my $conf = $self->configure_object;
my %hash = @_;
local $Params::Check::NO_DUPLICATES = 0;
my ($modobj, $verbose, $force, $fetch_from, $ttl);
my $tmpl = {
module => { required => 1, allow => IS_MODOBJ, store => \$modobj },
fetchdir => { default => $conf->get_conf('fetchdir') },
fetch_from => { default => '', store => \$fetch_from },
force => { default => $conf->get_conf('force'),
store => \$force },
verbose => { default => $conf->get_conf('verbose'),
store => \$verbose },
prefer_bin => { default => $conf->get_conf('prefer_bin') },
ttl => { default => 0, store => \$ttl },
};
my $args = check( $tmpl, \%hash ) or return;
### check if we already downloaded the thing ###
if( (my $where = $modobj->status->fetch()) and not $force and not $ttl ) {
msg(loc("Already fetched '%1' to '%2', " .
"won't fetch again without force",
$modobj->module, $where ), $verbose );
return $where;
}
my ($remote_file, $local_file, $local_path);
### build the local path to downlaod to ###
{
$local_path = $args->{fetchdir} ||
File::Spec->catdir(
$conf->get_conf('base'),
$modobj->path,
);
### create the path if it doesn't exist ###
unless( -d $local_path ) {
unless( $self->_mkdir( dir => $local_path ) ) {
msg( loc("Could not create path '%1'", $local_path), $verbose);
return;
}
}
$local_file = File::Spec->rel2abs(
File::Spec->catfile(
$local_path,
$modobj->package,
)
);
### do we already have the file? if so, can we use the cached version,
### or do we need to refetch?
if( -e $local_file ) {
my $unlink = 0;
my $use_cached = 0;
### if force is in effect, we have to refetch
if( $force ) {
$unlink++
### if you provided a ttl, and it was exceeded, we'll refetch,
} elsif( $ttl and ([stat $local_file]->[9] + $ttl > time) ) {
msg(loc("Using cached file '%1' on disk; ".
"ttl (%2s) is not exceeded",
$local_file, $ttl), $verbose );
$use_cached++;
### if you provided a ttl, and the above conditional didn't match,
### we exceeded the ttl, so we refetch
} elsif ( $ttl ) {
$unlink++;
### otherwise we can use the cached version
} else {
$use_cached++;
}
if( $unlink ) {
### some fetches will fail if the files exist already, so let's
### delete them first
1 while unlink $local_file;
msg(loc("Could not delete %1, some methods may " .
"fail to force a download", $local_file), $verbose)
if -e $local_file;
} else {
### store where we fetched it ###
$modobj->status->fetch( $local_file );
return $local_file;
}
}
}
### we got a custom URI
if ( $fetch_from ) {
my $abs = $self->__file_fetch( from => $fetch_from,
to => $local_path,
verbose => $verbose );
unless( $abs ) {
error(loc("Unable to download '%1'", $fetch_from));
return;
}
### store where we fetched it ###
$modobj->status->fetch( $abs );
return $abs;
### we will get it from one of our mirrors
} else {
### build the remote path to download from ###
{ $remote_file = File::Spec::Unix->catfile(
$modobj->path,
$modobj->package,
);
unless( $remote_file ) {
error( loc('No remote file given for download') );
return;
}
}
### see if we even have a host or a method to use to download with ###
my $found_host;
my @maybe_bad_host;
HOST: {
### F*CKING PIECE OF F*CKING p4 SHIT makes
### '$File :: Fetch::SOME_VAR'
### into a meta variable and starts substituting the file name...
### GRAAAAAAAAAAAAAAAAAAAAAAH!
### use ' to combat it!
### set up some flags for File::Fetch ###
local $File'Fetch::BLACKLIST = $conf->_get_fetch('blacklist');
local $File'Fetch::TIMEOUT = $conf->get_conf('timeout');
local $File'Fetch::DEBUG = $conf->get_conf('debug');
local $File'Fetch::FTP_PASSIVE = $conf->get_conf('passive');
local $File'Fetch::FROM_EMAIL = $conf->get_conf('email');
local $File'Fetch::PREFER_BIN = $conf->get_conf('prefer_bin');
local $File'Fetch::WARN = $verbose;
### loop over all hosts we have ###
for my $host ( @{$conf->get_conf('hosts')} ) {
$found_host++;
my $where;
### file:// uris are special and need parsing
if( $host->{'scheme'} eq 'file' ) {
### the full path in the native format of the OS
my $host_spec =
File::Spec->file_name_is_absolute( $host->{'path'} )
? $host->{'path'}
: File::Spec->rel2abs( $host->{'path'} );
### there might be volumes involved on vms/win32
if( ON_WIN32 or ON_VMS ) {
### now extract the volume in order to be Win32 and
### VMS friendly.
### 'no_file' indicates that there's no file part
### of this path, so we only get 2 bits returned.
my ($vol, $host_path) = File::Spec->splitpath(
$host_spec, 'no_file'
);
### and split up the directories
my @host_dirs = File::Spec->splitdir( $host_path );
### if we got a volume we pretend its a directory for
### the sake of the file:// url
if( defined $vol and $vol ) {
### D:\foo\bar needs to be encoded as D|\foo\bar
### For details, see the following link:
### http://en.wikipedia.org/wiki/File://
### The RFC doesnt seem to address Windows volume
### descriptors but it does address VMS volume
### descriptors, however wikipedia covers a bit of
### history regarding win32
$vol =~ s/:$/|/ if ON_WIN32;
$vol =~ s/:// if ON_VMS;
### XXX i'm not sure what cases this is addressing.
### this comes straight from dmq's file:// patches
### for win32. --kane
### According to dmq, the best summary is:
### "if file:// urls dont look right on VMS reuse
### the win32 logic and see if that fixes things"
### first element not empty? Might happen on VMS.
### prepend the volume in that case.
if( $host_dirs[0] ) {
unshift @host_dirs, $vol;
### element empty? reuse it to store the volume
### encoded as a directory name. (Win32/VMS)
} else {
$host_dirs[0] = $vol;
}
}
### now it's in UNIX format, which is the same format
### as used for URIs
$host_spec = File::Spec::Unix->catdir( @host_dirs );
}
### now create the file:// uri from the components
$where = CREATE_FILE_URI->(
File::Spec::Unix->catfile(
$host->{'host'} || '',
$host_spec,
$remote_file,
)
);
### its components will be in unix format, for a http://,
### ftp:// or any other style of URI
} else {
my $mirror_path = File::Spec::Unix->catfile(
$host->{'path'}, $remote_file
);
my %args = ( scheme => $host->{scheme},
host => $host->{host},
path => $mirror_path,
);
$where = $self->_host_to_uri( %args );
}
my $abs = $self->__file_fetch( from => $where,
to => $local_path,
verbose => $verbose );
### we got a path back?
if( $abs ) {
### store where we fetched it ###
$modobj->status->fetch( $abs );
### this host is good, the previous ones are apparently
### not, so mark them as such.
$self->_add_fail_host( host => $_ ) for @maybe_bad_host;
return $abs;
}
### so we tried to get the file but didn't actually fetch it --
### there's a chance this host is bad. mark it as such and
### actually flag it back if we manage to get the file
### somewhere else
push @maybe_bad_host, $host;
}
}
$found_host
? error(loc("Fetch failed: host list exhausted " .
"-- are you connected today?"))
: error(loc("No hosts found to download from " .
"-- check your config"));
}
return;
}
sub __file_fetch {
my $self = shift;
my $conf = $self->configure_object;
my %hash = @_;
my ($where, $local_path, $verbose);
my $tmpl = {
from => { required => 1, store => \$where },
to => { required => 1, store => \$local_path },
verbose => { default => $conf->get_conf('verbose'),
store => \$verbose },
};
check( $tmpl, \%hash ) or return;
msg(loc("Trying to get '%1'", $where ), $verbose );
### build the object ###
my $ff = File::Fetch->new( uri => $where );
### sanity check ###
error(loc("Bad uri '%1'",$where)), return unless $ff;
if( my $file = $ff->fetch( to => $local_path ) ) {
unless( -e $file && -s _ ) {
msg(loc("'%1' said it fetched '%2', but it was not created",
'File::Fetch', $file), $verbose);
} else {
my $abs = File::Spec->rel2abs( $file );
### so TTLs will work
$self->_update_timestamp( file => $abs );
return $abs;
}
} else {
error(loc("Fetching of '%1' failed: %2", $where, $ff->error));
}
return;
}
=pod
=head2 _add_fail_host( host => $host_hashref )
Mark a particular host as bad. This makes C<CPANPLUS::Internals::Fetch>
skip it in fetches until this cache is flushed.
=head2 _host_ok( host => $host_hashref )
Query the cache to see if this host is ok, or if it has been flagged
as bad.
Returns true if the host is ok, false otherwise.
=cut
{ ### caching functions ###
sub _add_fail_host {
my $self = shift;
my %hash = @_;
my $host;
my $tmpl = {
host => { required => 1, default => {},
strict_type => 1, store => \$host },
};
check( $tmpl, \%hash ) or return;
return $self->_hosts->{$host} = 1;
}
sub _host_ok {
my $self = shift;
my %hash = @_;
my $host;
my $tmpl = {
host => { required => 1, store => \$host },
};
check( $tmpl, \%hash ) or return;
return $self->_hosts->{$host} ? 0 : 1;
}
}
1;
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