Module-Generic
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lib/Module/Generic/File.pm view on Meta::CPAN
{
if( $cwd eq $dir )
{
my $updir = Cwd::abs_path( File::Spec->updir );
warnings::warn( "You currently are inside a directory to remove ($dir), moving you up to $updir\n" ) if( warnings::enabled() );
CORE::chdir( $updir ) || do
{
warnings::warn( "Unable to move to directory '$updir' above current directory: $!\n" ) if( warnings::enabled() );
next;
};
}
CORE::rmdir( $dir ) || do
{
warnings::warn( "Unable to remove directory $dir: $!\n" ) if( warnings::enabled() );
};
}
}
};
# NOTE: For CBOR and Sereal
sub FREEZE
{
my $self = CORE::shift( @_ );
my $serialiser = CORE::shift( @_ ) // '';
my $class = CORE::ref( $self );
my %hash = %$self;
CORE::delete( @hash{ qw( opened _handle ) } );
# Return an array reference rather than a list so this works with Sereal and CBOR
# On or before Sereal version 4.023, Sereal did not support multiple values returned
CORE::return( [$class, \%hash] ) if( $serialiser eq 'Sereal' && Sereal::Encoder->VERSION <= version->parse( '4.023' ) );
# But Storable want a list with the first element being the serialised element
CORE::return( $class, \%hash );
}
sub STORABLE_freeze { return( shift->FREEZE( @_ ) ); }
sub STORABLE_thaw { return( shift->THAW( @_ ) ); }
# NOTE: CBOR will call the THAW method with the stored classname as first argument, the constant string CBOR as second argument, and all values returned by FREEZE as remaining arguments.
# NOTE: Storable calls it with a blessed object it created followed with $cloning and any other arguments initially provided by STORABLE_freeze
sub THAW
{
# STORABLE_thaw would issue $cloning as the 2nd argument, while CBOR would issue
# 'CBOR' as the second value.
my( $self, undef, @args ) = @_;
my $ref = ( CORE::scalar( @args ) == 1 && CORE::ref( $args[0] ) eq 'ARRAY' ) ? CORE::shift( @args ) : \@args;
my $class = ( CORE::defined( $ref ) && CORE::ref( $ref ) eq 'ARRAY' && CORE::scalar( @$ref ) > 1 ) ? CORE::shift( @$ref ) : ( CORE::ref( $self ) || $self );
my $hash = CORE::ref( $ref ) eq 'ARRAY' ? CORE::shift( @$ref ) : {};
my $new;
# Storable pattern requires to modify the object it created rather than returning a new one
if( CORE::ref( $self ) )
{
foreach( CORE::keys( %$hash ) )
{
$self->{ $_ } = CORE::delete( $hash->{ $_ } );
}
$new = $self;
}
else
{
$new = CORE::bless( $hash => $class );
}
CORE::return( $new );
}
sub TO_JSON { return( shift->filepath ); }
# NOTE: IO::File class modification
{
package
IO::File;
sub flock { CORE::flock( shift( @_ ), shift( @_ ) ); }
}
# NOTE: Module::Generic::File::Map class
{
package
Module::Generic::File::Map;
BEGIN
{
use strict;
use warnings;
use parent qw( Tie::Scalar );
};
sub TIESCALAR
{
my $this = shift( @_ );
my $class = ref( $this ) || $this;
my $opts = shift( @_ );
if( ref( $opts ) ne 'HASH' )
{
warn( "I was expecting an hash reference of options, but got instead '$opts'\n" );
return;
}
my( $io, $file );
if( !( $io = $opts->{fh} ) )
{
warn( "No file handle provided\n" );
return;
}
if( !( $file = $opts->{file} ) )
{
warn( "No file path was provided.\n" );
return;
}
no strict 'refs';
my $ref = \$file;
${$$ref} = $opts;
return( bless( $ref => $class ) );
}
sub FETCH
{
my $self = shift( @_ );
no strict 'refs';
my $fh;
if( !( $fh = ${$$self}->{fh} ) )
{
warn( "Filehandle is gone!\n" );
return;
}
my $parent = ${$$self}->{me};
my $data = $parent->load;
# Initial variable length, if any, because initially the file may be padded with nulls
# and we do not want them. We could use unpack( 'A*', $data );, but the variable data
# itself could have some nulls too, so we cannot rely on this.
my $var_len = ${$$self}->{length} // 0;
# $data =~ s/\0+$//gs;
# $data = unpack( 'A*', $data );
return( substr( $data, 0, $var_len ) ) if( $var_len );
#$data = unpack( 'Z*', $data );
$data =~ s/\0+$//g;
return( $data );
}
sub STORE
{
my $self = shift( @_ );
no strict 'refs';
my $fh;
if( !( $fh = ${$$self}->{fh} ) )
{
warn( "Filehandle is gone!\n" );
return;
}
my $size = ${$$self}->{size};
my $parent = ${$$self}->{me};
unless( $fh->opened )
{
warn( "filehandle is not opened for file \"", $parent->filename, "\".\n" );
}
$parent->lock( shared => 1 );
$fh->seek(0,0) || do
{
warn( "Unable to set position at beginning in file \"", $parent->filename, "\": $!\n" );
# return;
};
# This needs to be print and not syswrite, because we cannot mix syswrite and read/print
if( !$fh->print( $_[0] ) )
{
warn( "Unable to write ", CORE::length( $_[0] // '' ), " byte(s) to file \"", $parent->filename, "\": $!\n" );
return;
}
$parent->unlock;
$fh->sync;
$fh->flush;
# $fh->print( "\000" x ( $size - length( $_[0] ) ) );
if( !CORE::defined( $fh->truncate( $fh->tell ) ) )
{
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