NAME

Crypt::Random::Source::Base::Handle - IO::Handle based random data sources

SYNOPSIS

    use Moose;
    extends qw(Crypt::Random::Source::Base::Handle);

    sub open_handle {
        # invoked as needed
    }


    # this class can also be used directly
    Crypt::Random::Source::Base::Handle->new( handle => $file_handle );


    # it supports some standard methods:

    $p->blocking(0);

    $p->read( my $buf, $n ); # no error handling here

DESCRIPTION

This is a concrete base class for all IO::Handle based random data sources.

It implements error handling

ATTRIBUTES

handle

An IO::Handle or file handle to read from.

blocking

This is actually handled by handle, and is documented in IO::Handle.

allow_under_read

Whether or not under reading is considered an error.

Defaults to false.

reread_attempts

The number of attempts to make at rereading if the handle did not provide enough bytes on the first attempt.

Defaults to 1.

Only used if allow_under_read is enabled.

METHODS

get

See "get" in Crypt::Random::Source::Base.

When blocking or allow_under_read are set to a true value this method may return fewer bytes than requested.

read

This delegates directly to handle.

It DOES NOT provide the same validation as get would have, so no checking for underreads is done.

close

Close the handle and clear it.

_read

$self->handle->read but with additional error checking and different calling conventions.

_read_too_short

Called by _read when not enough data was read from the handle. Normally it will either die with an error or attempt to reread. When allow_under_read is true it will just return the partial buffer.

open_handle

Abstract method, should return an IO::Handle to use.

AUTHOR

  Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Yuval Kogman.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

cpanm Crypt::Random::Source

perl -MCPAN -e shell
install Crypt::Random::Source