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147630
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use strict; |
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use warnings; |
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package Plack::Middleware::AdaptFilehandleRead::Proxy; |
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sub new { |
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my ($class, $target, $chunksize) = @_; |
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die "$target doens't have a read method" unless $target->can('read'); |
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return bless +{ _t => $target, _cs => ($chunksize|| 65536), _buff=> ''}, $class; |
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} |
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sub getline { |
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30614
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30614
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my $fh = (my $self = shift)->{_t}; |
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30614
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77994
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if(!defined($/)) { |
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# slurp mode, we pray we never see this.. |
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0
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die "Slurping not supported, patches welcomed"; |
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} elsif(ref($/)) { |
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# fixed chunk mode |
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22612
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my $chunk; |
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22612
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my $len = +${$/}; # can be \4096 or \'4096' some numify |
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34461
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22612
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100
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66129
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if($fh->read($chunk,$len)) { |
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22610
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159310
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return $chunk; |
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} else { |
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return; |
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} |
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} elsif($/ eq "") { |
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# Nullstring mode |
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0
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die "Null not supported, patches welcomed"; |
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} else { |
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# We assume character delim mode... There's a few other weird options |
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# but I doubt we'll see them in the context of a Plack handler. |
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# If the buffer is undef, that means we've read it all |
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8002
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16445
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return unless defined($self->{_buff}); |
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# If the current temporary read buffer has a match for $/ |
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8002
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if( (my $idx = index($self->{_buff}, $/)) >= 0) { |
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#remove from the start of the buffer to the match and return it |
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8000
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my $line = substr($self->{_buff}, 0, $idx+1); |
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8000
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73103
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$self->{_buff} = substr($self->{_buff},$idx+1); # truncate current buffer |
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8000
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return $line; |
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} else { |
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# read a chunk into the temporary buffer and try again |
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my $chunk; |
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$fh->read($chunk,$self->{_cs}); |
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if($chunk) { |
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$self->{_buff} .= $chunk; |
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return $self->getline; |
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} else { |
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# no more chunks? just return what is left and set the buffer to undef |
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# so we know to stop asking. |
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return my $last_line = delete $self->{_buff}; |
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} |
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} |
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} |
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} |
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sub AUTOLOAD { |
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1
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my ($self, @args) = @_; |
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1
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my ($method) = (our $AUTOLOAD =~ /([^:]+)$/); |
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1
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return $self->{_t}->$method(@args) |
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} |
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1; |
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66
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=head1 NAME |
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Plack::Middleware::AdaptFilehandleRead::Proxy - Wrap an object to supply missing getline |
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70
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=head1 SYNOPSIS |
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72
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my $new_fh = Plack::Middleware::AdaptFilehandleRead::Proxy->new($old_fh); |
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my $line = $new_fh->getline; |
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=head1 DESCRIPTION |
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Wraps a filehandle like object that has a read method and provides a getline |
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method that works as in L All other method calls will be |
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delegated to the original object. |
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This is used primarily to adapt a filehandle like object that does C |
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but not C so that you can use it as the body value for a L |
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response. For example, L can return such a custom filehandle |
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like object and you may wish to use that response to stream via a L |
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application. |
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When adapting C to C we examine the state of C<$/> in order to |
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figure out what to do. For the normal case, if $/ is a simple value (such as |
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/n or newline, which is the default) we call C and ask for chunks of 65536 |
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bytes. This may or may not be ideal for your data, in which case you may wish |
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to override it as so: |
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my $new_fh = Plack::Middleware::AdaptFilehandleRead::Proxy |
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->new($old_fh, $chunksize); |
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Please be aware that the chunksize is read into memory. |
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We then examine the chunk and return records as indicated by the deliminator. |
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When the chunk does not have such a match, we read chunks until it does or we |
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read the entire file. |
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For the case when $/ is a scalar ref, such as $/ = \'4096' we will instead read |
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fixed sized chunks from ->read and ignore any C settings (you can |
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always localize $/ yourself if you prefer more control). |
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Typically plack prefers C to return chunks of a predefined length and |
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all the common plack handers such as L, L set $/ when calling |
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C although as the L specification indicates this support of "$/" |
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is considered optional for a custom filehandle like body. We choose to support |
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it since it can help avoid a situation where your entire file gets read into |
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memory when the file does not contain newlines (or whatever $/ is set to). |
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Currently this object delegates all method calls beyond C to the |
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underlying proxied object via AUTOLOAD. We do not attempt to proxy any |
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Ling (patches for this welcomed). |
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=head1 METHODS |
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119
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This class defines the following methods |
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121
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=head2 getline |
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returns a line from the file, as described by L, suitable for |
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the L requirement of a filehandle like object. It work by calling C |
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in chunks, and returns lines. |
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127
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=head2 AUTOLOAD |
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Used to delegate all other method calls to the underlying wrapped instance. |
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=head1 SEE ALSO |
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133
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L, L. |
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135
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=head1 AUTHOR |
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137
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John Napiorkowski L |
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139
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=head1 COPYRIGHT & LICENSE |
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141
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Copyright 2014, John Napiorkowski L |
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143
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This library is free software; you can redistribute it and/or modify it under |
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the same terms as Perl itself. |
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146
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=cut |