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| 1 |  |  |  |  |  |  | package AnyEvent::Redis::Protocol; | 
| 2 |  |  |  |  |  |  |  | 
| 3 | 8 |  |  | 8 |  | 44 | use strict; | 
|  | 8 |  |  |  |  | 16 |  | 
|  | 8 |  |  |  |  | 341 |  | 
| 4 | 8 |  |  | 8 |  | 46 | use warnings; | 
|  | 8 |  |  |  |  | 15 |  | 
|  | 8 |  |  |  |  | 7900 |  | 
| 5 |  |  |  |  |  |  |  | 
| 6 |  |  |  |  |  |  | =head1 NAME | 
| 7 |  |  |  |  |  |  |  | 
| 8 |  |  |  |  |  |  | AnyEvent::Redis::Protocol - Redis response parser (read handler) for AnyEvent | 
| 9 |  |  |  |  |  |  |  | 
| 10 |  |  |  |  |  |  | =head1 DESCRIPTION | 
| 11 |  |  |  |  |  |  |  | 
| 12 |  |  |  |  |  |  | This package should not be directly used.  It provides an AnyEvent read handler | 
| 13 |  |  |  |  |  |  | capable of parsing Redis responses. | 
| 14 |  |  |  |  |  |  |  | 
| 15 |  |  |  |  |  |  | =head1 SEE ALSO | 
| 16 |  |  |  |  |  |  |  | 
| 17 |  |  |  |  |  |  | L, | 
| 18 |  |  |  |  |  |  | Redis Protocol Specification L | 
| 19 |  |  |  |  |  |  |  | 
| 20 |  |  |  |  |  |  | =cut | 
| 21 |  |  |  |  |  |  |  | 
| 22 |  |  |  |  |  |  | sub anyevent_read_type { | 
| 23 | 0 |  |  | 0 | 0 |  | my ($handle, $cb) = @_; | 
| 24 |  |  |  |  |  |  |  | 
| 25 |  |  |  |  |  |  | return sub { | 
| 26 |  |  |  |  |  |  | $handle->push_read(line => sub { | 
| 27 | 0 |  |  |  |  |  | my $line = $_[1]; | 
| 28 | 0 |  |  |  |  |  | my $type = substr($line, 0, 1); | 
| 29 | 0 |  |  |  |  |  | my $value = substr($line, 1); | 
| 30 | 0 | 0 | 0 |  |  |  | if ($type eq '*') { | 
|  |  | 0 |  |  |  |  |  | 
|  |  | 0 |  |  |  |  |  | 
|  |  | 0 |  |  |  |  |  | 
| 31 |  |  |  |  |  |  | # Multi-bulk reply | 
| 32 | 0 |  |  |  |  |  | my $remaining = $value; | 
| 33 | 0 | 0 |  |  |  |  | if ($remaining == 0) { | 
|  |  | 0 |  |  |  |  |  | 
| 34 | 0 |  |  |  |  |  | $cb->([]); | 
| 35 |  |  |  |  |  |  | } elsif ($remaining == -1) { | 
| 36 | 0 |  |  |  |  |  | $cb->(undef); | 
| 37 |  |  |  |  |  |  | } else { | 
| 38 | 0 |  |  |  |  |  | my $results = []; | 
| 39 |  |  |  |  |  |  | $handle->unshift_read(sub { | 
| 40 | 0 |  |  |  |  |  | my $need_more_data = 0; | 
| 41 | 0 |  |  |  |  |  | do { | 
| 42 | 0 | 0 |  |  |  |  | if ($handle->{rbuf} =~ /^(\$(-?\d+)\015\012)/) { | 
|  |  | 0 |  |  |  |  |  | 
|  |  | 0 |  |  |  |  |  | 
| 43 | 0 |  |  |  |  |  | my ($match, $vallen) = ($1, $2); | 
| 44 | 0 | 0 |  |  |  |  | if ($vallen == -1) { | 
|  |  | 0 |  |  |  |  |  | 
| 45 |  |  |  |  |  |  | # Delete the bulk header. | 
| 46 | 0 |  |  |  |  |  | substr($handle->{rbuf}, 0, length($match), ''); | 
| 47 | 0 |  |  |  |  |  | push @$results, undef; | 
| 48 | 0 | 0 |  |  |  |  | unless (--$remaining) { | 
| 49 | 0 |  |  |  |  |  | $cb->($results); | 
| 50 | 0 |  |  |  |  |  | return 1; | 
| 51 |  |  |  |  |  |  | } | 
| 52 |  |  |  |  |  |  | } elsif (length $handle->{rbuf} >= (length($match) + $vallen + 2)) { | 
| 53 |  |  |  |  |  |  | # OK, we have enough in our buffer. | 
| 54 |  |  |  |  |  |  | # Delete the bulk header. | 
| 55 | 0 |  |  |  |  |  | substr($handle->{rbuf}, 0, length($match), ''); | 
| 56 | 0 |  |  |  |  |  | my $value = substr($handle->{rbuf}, 0, $vallen, ''); | 
| 57 | 0 | 0 | 0 |  |  |  | $value = $handle->{encoding}->decode($value) | 
| 58 |  |  |  |  |  |  | if $handle->{encoding} && $vallen; | 
| 59 | 0 |  |  |  |  |  | push @$results, $value; | 
| 60 |  |  |  |  |  |  | # Delete trailing data characters. | 
| 61 | 0 |  |  |  |  |  | substr($handle->{rbuf}, 0, 2, ''); | 
| 62 | 0 | 0 |  |  |  |  | unless (--$remaining) { | 
| 63 | 0 |  |  |  |  |  | $cb->($results); | 
| 64 | 0 |  |  |  |  |  | return 1; | 
| 65 |  |  |  |  |  |  | } | 
| 66 |  |  |  |  |  |  | } else { | 
| 67 | 0 |  |  |  |  |  | $need_more_data = 1; | 
| 68 |  |  |  |  |  |  | } | 
| 69 |  |  |  |  |  |  | } elsif ($handle->{rbuf} =~ s/^([\+\-:])([^\015\012]*)\015\012//) { | 
| 70 | 0 |  |  |  |  |  | my ($type, $value) = ($1, $2); | 
| 71 | 0 | 0 | 0 |  |  |  | if ($type eq '+' || $type eq ':') { | 
|  |  | 0 |  |  |  |  |  | 
| 72 | 0 |  |  |  |  |  | push @$results, $value; | 
| 73 |  |  |  |  |  |  | } elsif ($type eq '-') { | 
| 74 |  |  |  |  |  |  | # Embedded error; this seems possible only in EXEC answer, | 
| 75 |  |  |  |  |  |  | #  so include error in results; don't abort parsing | 
| 76 | 0 |  |  |  |  |  | push @$results, bless \$value, 'AnyEvent::Redis::Error'; | 
| 77 |  |  |  |  |  |  | } | 
| 78 | 0 | 0 |  |  |  |  | unless (--$remaining) { | 
| 79 | 0 |  |  |  |  |  | $cb->($results); | 
| 80 | 0 |  |  |  |  |  | return 1; | 
| 81 |  |  |  |  |  |  | } | 
| 82 |  |  |  |  |  |  | } elsif (substr($handle->{rbuf}, 0, 1) eq '*') { | 
| 83 |  |  |  |  |  |  | # Oh, how fun!  A nested bulk reply. | 
| 84 | 0 |  |  |  |  |  | my $reader; $reader = sub { | 
| 85 |  |  |  |  |  |  | $handle->unshift_read("AnyEvent::Redis::Protocol" => sub { | 
| 86 | 0 |  |  |  |  |  | push @$results, $_[0]; | 
| 87 | 0 | 0 |  |  |  |  | if (--$remaining) { | 
| 88 | 0 |  |  |  |  |  | $reader->(); | 
| 89 |  |  |  |  |  |  | } else { | 
| 90 | 0 |  |  |  |  |  | undef $reader; | 
| 91 | 0 |  |  |  |  |  | $cb->($results); | 
| 92 |  |  |  |  |  |  | } | 
| 93 | 0 |  |  |  |  |  | }); | 
| 94 | 0 |  |  |  |  |  | }; | 
| 95 | 0 |  |  |  |  |  | $reader->(); | 
| 96 | 0 |  |  |  |  |  | return 1; | 
| 97 |  |  |  |  |  |  | } else { | 
| 98 |  |  |  |  |  |  | # Nothing matched - read more... | 
| 99 | 0 |  |  |  |  |  | $need_more_data = 1; | 
| 100 |  |  |  |  |  |  | } | 
| 101 |  |  |  |  |  |  | } until $need_more_data; | 
| 102 | 0 |  |  |  |  |  | return; # get more data | 
| 103 | 0 |  |  |  |  |  | }); | 
| 104 |  |  |  |  |  |  | } | 
| 105 |  |  |  |  |  |  | } elsif ($type eq '+' || $type eq ':') { | 
| 106 |  |  |  |  |  |  | # Single line/integer reply | 
| 107 | 0 |  |  |  |  |  | $cb->($value); | 
| 108 |  |  |  |  |  |  | } elsif ($type eq '-') { | 
| 109 |  |  |  |  |  |  | # Single-line error reply | 
| 110 | 0 |  |  |  |  |  | $cb->($value, 1); | 
| 111 |  |  |  |  |  |  | } elsif ($type eq '$') { | 
| 112 |  |  |  |  |  |  | # Bulk reply | 
| 113 | 0 |  |  |  |  |  | my $length = $value; | 
| 114 | 0 | 0 |  |  |  |  | if ($length == -1) { | 
| 115 | 0 |  |  |  |  |  | $cb->(undef); | 
| 116 |  |  |  |  |  |  | } else { | 
| 117 |  |  |  |  |  |  | # We need to read 2 bytes more than the length (stupid | 
| 118 |  |  |  |  |  |  | # CRLF framing).  Then we need to discard them. | 
| 119 |  |  |  |  |  |  | $handle->unshift_read(chunk => $length + 2, sub { | 
| 120 | 0 |  |  |  |  |  | my $data = $_[1]; | 
| 121 | 0 |  |  |  |  |  | my $value = substr($data, 0, $length); | 
| 122 | 0 | 0 | 0 |  |  |  | $value = $handle->{encoding}->decode($value) | 
| 123 |  |  |  |  |  |  | if $handle->{encoding} && $length; | 
| 124 | 0 |  |  |  |  |  | $cb->($value); | 
| 125 | 0 |  |  |  |  |  | }); | 
| 126 |  |  |  |  |  |  | } | 
| 127 |  |  |  |  |  |  | } | 
| 128 | 0 |  |  |  |  |  | return 1; | 
| 129 | 0 |  |  | 0 |  |  | }); | 
| 130 | 0 |  |  |  |  |  | return 1; | 
| 131 | 0 |  |  |  |  |  | }; | 
| 132 |  |  |  |  |  |  | } | 
| 133 |  |  |  |  |  |  |  | 
| 134 |  |  |  |  |  |  | =head1 AUTHOR | 
| 135 |  |  |  |  |  |  |  | 
| 136 |  |  |  |  |  |  | Michael S. Fischer | 
| 137 |  |  |  |  |  |  |  | 
| 138 |  |  |  |  |  |  | =head1 COPYRIGHT AND LICENSE | 
| 139 |  |  |  |  |  |  |  | 
| 140 |  |  |  |  |  |  | Copyright (C) 2010 Michael S. Fischer. | 
| 141 |  |  |  |  |  |  |  | 
| 142 |  |  |  |  |  |  | This program is free software; you can redistribute it and/or modify it | 
| 143 |  |  |  |  |  |  | under the terms of either: the GNU General Public License as published | 
| 144 |  |  |  |  |  |  | by the Free Software Foundation; or the Artistic License. | 
| 145 |  |  |  |  |  |  |  | 
| 146 |  |  |  |  |  |  | See http://dev.perl.org/licenses/ for more information. | 
| 147 |  |  |  |  |  |  |  | 
| 148 |  |  |  |  |  |  | =cut | 
| 149 |  |  |  |  |  |  |  | 
| 150 |  |  |  |  |  |  | 1; | 
| 151 |  |  |  |  |  |  |  | 
| 152 |  |  |  |  |  |  | __END__ |