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package XAS::Lib::Stomp::Parser; |
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our $VERSION = '0.03'; |
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827
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use XAS::Lib::Stomp::Frame; |
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use XAS::Constants ':stomp'; |
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use XAS::Class |
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debug => 0, |
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version => $VERSION, |
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base => 'XAS::Base', |
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mixin => 'XAS::Lib::Mixins::Bufops', |
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utils => 'trim', |
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vars => { |
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PARAMS => { |
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-target => { optional => 1, default => undef, regex => STOMP_LEVELS }, |
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} |
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} |
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; |
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my $HEADER = STOMP_HEADER; |
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my $CNTRL = STOMP_CNTRL; |
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my $BEOH = STOMP_BEOH; |
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my $EOF = STOMP_EOF; |
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my $EOH = STOMP_EOH; |
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my $EOL = STOMP_EOL; |
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#use Data::Dumper; |
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#use Data::Hexdumper; |
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# ---------------------------------------------------------------------- |
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# Public Methods |
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# ---------------------------------------------------------------------- |
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sub parse { |
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my $self = shift; |
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my $buffer = shift; |
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my $line; |
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my $length; |
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0
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my $clength; |
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0
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my $count = 0; |
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0
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my $frame = undef; |
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658
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use bytes; |
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$self->{buffer} .= $buffer; |
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0
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$self->log->debug('stomp-parser: begin'); |
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# $self->log->debug(hexdump($self->{buffer})); |
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# A valid frame is usually this: |
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# |
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# command<eol> - command |
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# header<eol> - 0 or more |
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# <eol> - seperator |
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# body<eof> - body |
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# |
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# as of v1.1 this is a valid frame |
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# |
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# <eol><eol><eol><eof> |
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# |
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# and is used as a NOOP, which is used as a protocol keepalive. This |
65
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# module will create a fake 'NOOP' command for that frame. Frame |
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# stringification does the right thing. |
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# |
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# All current versions define <eof> as \000. |
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# |
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# In v1.0 and v1.1, <eol> was defined as NEWLINE, which is \012, but, |
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# common usage was \n, which is platform specific, hence the $EOL, $EOH |
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# and $BEOH regexs to match against. |
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# |
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# v1.2 changes <eol> to \015\012 |
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# |
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0
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for (;;) { |
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79
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0
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$self->log->debug('stomp-parser: state = ' . $self->{state}); |
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81
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0
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0
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if ($self->{state} eq 'command') { |
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0
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0
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82
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83
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# start of the frame |
84
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# check for a valid buffer, must have a EOL someplace. |
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86
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0
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0
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if ($line = $self->buf_get_line(\$self->{buffer}, $EOL)) { |
87
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88
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0
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$self->log->debug('stomp-parser: command'); |
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# $self->log->debug(hexdump($line)); |
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91
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0
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$line = trim($line); |
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93
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0
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0
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$self->{command} = ($line eq '') ? 'NOOP' : $line; |
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0
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$self->{state} = 'headers'; |
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96
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0
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} else { last; } |
97
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98
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} elsif ($self->{state} eq 'headers') { |
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100
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# start of the headers, they last until a standalone <eol> |
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# or <eof> is reached. |
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103
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0
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$self->log->debug("stomp-parser: header"); |
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105
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0
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$length = length($self->{buffer}); |
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107
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0
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$self->{buffer} =~ m/$EOH/g; |
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0
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0
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$clength = pos($self->{buffer}) || -1; |
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110
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0
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$self->log->debug("stomp-parser: end of headers, length: $clength"); |
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112
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0
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0
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if ($clength == -1) { |
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114
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0
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pos($self->{buffer}) = 0; |
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0
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$self->{buffer} =~ m/$BEOH/g; |
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0
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0
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$clength = pos($self->{buffer}) || -1; |
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118
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0
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$self->log->debug("stomp-parser: end of frame, length: $clength"); |
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120
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} |
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122
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0
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0
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0
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if (($clength != -1) && ($clength <= $length)) { |
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124
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0
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$line = $self->buf_slurp(\$self->{buffer}, $clength); |
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# $self->log->debug(hexdump($line)); |
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127
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0
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while ($line =~ s/^$HEADER//) { |
128
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129
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0
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$self->log->debug('stomp-parser: valid header'); |
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131
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0
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my $key = lc($1); |
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0
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my $value = trim($2); |
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134
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# v1.2 says that the first defined header is |
135
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# to be honored. v1.0 and v1.1 implies that |
136
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# the last defined header is honored. The duplictes |
137
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# are discarded. |
138
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139
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0
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0
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if ($self->target < 1.2) { |
140
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141
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0
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$self->{headers}->{$key} = $value; |
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143
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} else { |
144
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145
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0
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0
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unless (defined($self->{headers}->{$key})) { |
146
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147
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0
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$self->{headers}->{$key} = $value; |
148
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149
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} |
150
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151
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} |
152
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153
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0
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$line =~ s/$EOL//; |
154
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155
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} |
156
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157
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0
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$self->{state} = 'body'; |
158
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159
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0
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} else { last; } |
160
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161
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} elsif ($self->{state} eq 'body') { |
162
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163
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0
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$self->log->debug('stomp-parser: body'); |
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165
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# start of the body, determine wither to use |
166
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# content-length or EOF to find the end |
167
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168
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0
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$length = length($self->{buffer}); |
169
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170
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0
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0
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if ($clength = $self->{headers}->{'content-length'}) { |
171
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172
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0
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$self->log->debug('stomp-parser: using content-length'); |
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174
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0
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0
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if ($clength <= $length) { |
175
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176
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0
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$self->{body} = $self->buf_slurp(\$self->{buffer}, $clength); |
177
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0
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$self->{state} = 'frame'; |
178
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179
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0
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} else { last; } |
180
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181
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} else { |
182
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183
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0
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$self->log->debug('stomp-parser: using EOF'); |
184
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185
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0
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$clength = index($self->{buffer}, $EOF); |
186
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187
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0
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0
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0
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if (($clength != -1) && ($clength <= $length)) { |
188
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189
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0
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$self->{body} = $self->buf_get_line(\$self->{buffer}, $EOF); |
190
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0
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chop $self->{body}; |
191
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0
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$self->{state} = 'frame'; |
192
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193
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0
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} else { last; } |
194
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195
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} |
196
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197
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} elsif ($self->{state} eq 'frame') { |
198
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199
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0
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$self->log->debug('stomp-parser: building frame'); |
200
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201
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# clear out inter-frame crap and create the object. |
202
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203
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0
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$self->{buffer} =~ s/^$CNTRL//; |
204
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205
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$frame = XAS::Lib::Stomp::Frame->new( |
206
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-command => $self->{command}, |
207
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-headers => $self->{headers}, |
208
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-body => $self->{body} |
209
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0
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); |
210
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211
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# reset ourselves |
212
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213
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0
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$count = 0; |
214
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215
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0
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delete $self->{command}; |
216
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0
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delete $self->{headers}; |
217
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0
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delete $self->{body}; |
218
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219
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0
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$self->{state} = 'command'; |
220
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221
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} |
222
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223
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} |
224
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225
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0
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return $frame; |
226
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227
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} |
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} |
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# ---------------------------------------------------------------------- |
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# Private Methods |
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# ---------------------------------------------------------------------- |
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sub init { |
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} |
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} |
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1; |
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__END__ |
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=head1 NAME |
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XAS::Lib::Stomp::Parse - Create a STOMP Frame From a Buffer |
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=head1 SYNOPSIS |
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use XAS::Lib::Stomp::Parser; |
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my $parser = XAS::Lib::Stomp::Parser->new(); |
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while (my $buffer = read()) { |
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if (my $frame = $parser->parse($buffer)) { |
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# do something... |
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} |
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} |
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=head1 DESCRIPTION |
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This module creates STOMP frames from a buffer. STOMP is the |
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Streaming Text Orientated Messaging Protocol (or the Protocol Briefly |
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Known as TTMP and Represented by the symbol :ttmp). It's a simple and easy to |
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implement protocol for working with Message Orientated Middleware from |
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any language. This module supports v1.0, v1.1 and v1.2 frames with limited |
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interoperability between the frame types. |
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A STOMP frame consists of a command, a series of headers and a body. |
291
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=head1 METHODS |
293
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=head2 new |
295
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296
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Creates a new parser. |
297
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298
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|
=head2 get_pending |
299
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|
300
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|
|
Returns the contents of the internal buffer. |
301
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302
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|
|
=head1 SEE ALSO |
303
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304
|
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|
|
=over 4 |
305
|
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|
306
|
|
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|
|
|
|
=item L<XAS|XAS> |
307
|
|
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308
|
|
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|
|
|
=back |
309
|
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|
310
|
|
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|
|
|
|
For more information on the STOMP protocol, please refer to: L<http://stomp.github.io/> . |
311
|
|
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|
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|
|
312
|
|
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|
|
|
|
=head1 AUTHOR |
313
|
|
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|
|
|
|
|
314
|
|
|
|
|
|
|
Kevin L. Esteb, E<lt>kevin@kesteb.usE<gt> |
315
|
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|
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|
|
316
|
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE |
317
|
|
|
|
|
|
|
|
318
|
|
|
|
|
|
|
Copyright (C) 2014 Kevin L. Esteb |
319
|
|
|
|
|
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|
|
320
|
|
|
|
|
|
|
This is free software; you can redistribute it and/or modify it under |
321
|
|
|
|
|
|
|
the terms of the Artistic License 2.0. For details, see the full text |
322
|
|
|
|
|
|
|
of the license at http://www.perlfoundation.org/artistic_license_2_0. |
323
|
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|
|
|
|
|
324
|
|
|
|
|
|
|
=cut |