initial implementation of CouchDB View server in perl

diff --git a/couchdb-view-server.pl b/couchdb-view-server.pl
new file mode 100755 (executable)
index 0000000..a8827b3
--- /dev/null
+++ b/couchdb-view-server.pl
@@ -0,0 +1,53 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+
+# http://wiki.apache.org/couchdb/View_server
+
+use JSON::XS;
+use IO::Handle;
+use Data::Dump qw(dump);
+
+my $j = JSON::XS->new;
+
+my $in  = IO::Handle->new_from_fd(\*STDIN, 'r');
+my $out = IO::Handle->new_from_fd(\*STDOUT, 'w');
+$out->autoflush(1);
+
+sub _log {
+       $out->print(qq|["log", "@_"]\n|);
+       warn "# log @_\n";
+}
+
+our $fun;
+
+while(defined(my $line = $in->getline)) {
+       chomp $line;
+       my $input = $j->decode($line);
+       my ($cmd, @args) = @$input;
+
+       if ( $cmd eq 'reset' ) {
+               undef $fun;
+               $out->print("true\n");
+       } elsif ( $cmd eq 'add_fun' ) {
+               $fun = eval @args;
+               if ( $@ ) {
+                       $out->print( qq|{"error": "$!", "reason": "$@"}\n| );
+               } else {
+                       $out->print("true\n");
+               }
+       } elsif ( $cmd eq 'map_doc' ) {
+               my @results;
+               our @d;
+               local @d;
+               eval { $fun->(@args) };
+               if ( $@ ) {
+                       _log $@;
+               } else {
+                       push @results, [@d];
+               }
+               $out->print($j->utf8->encode( \@results ), "\n");
+       } else {
+               die "$cmd unimplemented", dump( $input );
+       }
+}