lib/Frey/CouchAPI.pm

package Frey::CouchAPI;

=head1 DESCRIPTION

This is REST wrapper using following L<Mojo> implement Apache's CouchDB API


L<Mojo::URL>

L<Mojo::Transaction>


=head1 Supported HTTP API

=cut

use warnings;
use strict;

use JSON;
use Data::Dump qw/dump/;
use URI::Escape;
use File::Path qw(make_path remove_tree);
use Storable;

our $VERSION = '0.1';
$VERSION .= ' on Frey ' . $Frey::VERSION;

our $debug = $Frey::debug || 0;

sub rewrite_urls {
        my ( $self, $tx ) = @_;
        if ( $tx->req->url->path =~ m{/_utils/} ) {
                my $path = $tx->req->url->path;
                $path =~ s{(/_utils)/?$}{$1/index.html}; # poor man's DirectoryIndex
                $path =~  s{/_utils}{/static/futon};
                $tx->req->url->path( $path );
                my $url = $tx->req->url->to_string;
                my $old = $url;
                $url = $tx->req->url->to_string;
                warn "# rewrite $old -> $url\n";
        }
}

our $config = {
        path => '/data/webpac2/var/row',
};

my $p = $config->{path};
my @all_dbs = map {
        s{^\Q$p\E/*}{};
        $_;
} glob "$p/*/*";

my $regex_dbs = '[a-z][a-z0-9_\$\(\)\+\-/]+';

our $json = {};
our $status;

sub ok {
        $json = { ok => JSON::true };
        $status = 200;
        warn "ok\n";
}


sub dispatch {
        my ($self,$tx) = @_;

        $status = 500; # Internal Error

        my $url = $tx->req->url->to_string;
        $url = uri_unescape( $url );
        my $method = $tx->req->method;
        
        if ( $url eq '/' ) {
                $json = {
                        couchdb => "Welcome",
                        version => "CouchAPI $VERSION",
                };
                $status = 200;
        } elsif ( $url eq '/_all_dbs' ) {
                $json = [ @all_dbs ];
                $status = 200;
        } elsif ( $url =~ m{^/_config/?(.+)} ) {

                $json = { CouchAPI => $config };

                if ( $method eq 'PUT' ) {

                        my $part = $1;
                        warn "## part $part";

                        $part =~ s!^!->{'!;
                        $part =~ s!/!'}->{'!;
                        $part =~ s/$/'}/;

                        my $data = $tx->req->content->file->slurp;
                        $data = JSON->new->allow_nonref->decode( $data );
                        warn "## data ",dump( $data );
                        # poor man's transaction :-)
                        my $code = "\$json$part = \$data; \$config$part = \$data;";
                        eval $code;
                        if ( $@ ) {
                                warn "ERROR: $code -> $@";
                                $status = 500;
                        } else {
                                $status = 200;
                        }

warn "json ",dump( $json ), " config ", dump( $config );

                } elsif ( $method eq 'GET' ) {
                        $status = 200;
                } else {
                        $status = 501;
                }

        } elsif ( $url =~ m{($regex_dbs)/$} ) {

=head2 Database

L<http://wiki.apache.org/couchdb/HTTP_database_API> except compaction

=cut

                my $database = $1;
                my $dir = "$config->{path}/$database";

                if ( $method eq 'GET' ) {
                        $json = database_get( $database );
                } elsif ( $method eq 'DELETE' ) {
                        if ( ! -e $dir ) {
                                $status = 404;
                        } else {
                                remove_tree($dir) && ok || { $status = 500 };
                        }
                } elsif ( $method eq 'PUT' ) {
                        if ( ! -e $dir ) {
                                make_path($dir) && ok && warn "created $dir" || { $status = 500 };
                        } else {
                                $status = 412;
                        }
                }

        } elsif ( $url =~ m{($regex_dbs)/([^?]+)\??(.+)?$} ) {
                my ($database,$id,$args) = ($1,$2,$3);

=head2 Document

L<http://wiki.apache.org/couchdb/HTTP_Document_API>

=cut

                my $arg;
                if ( $args ) {
                        foreach my $a ( split(/[&;]/,$args) ) {
                                my ($n,$v) = split(/=/,$a);
                                $v =~ s{(["'])(.+)\1}{$2};
                                $arg->{$n} = $v;
                        }
                }

                my $path = $config->{path};
                warn "ERROR: path $path doesn't exist\n" unless -e $path;

                my $p = "$path/$database/$id";
                warn "## database: $database id: $id -> $p ", dump( $arg ),"\n";


                if ( $id =~ m{_all_docs(\w+)?$} ) {

                        my $by = $1;
                        my $offset = 0;
                        my $startkey = delete $arg->{startkey};
                        my $endkey   = delete $arg->{endkey};
                        my $limit    = delete $arg->{limit};
                        my $total_rows = 0;

                        my @docs = grep { length $_ } map {
                                return '' if defined $limit && $total_rows == $limit;
        
                                s{^$path/$database/}{};
                                return '' if defined $endkey && $_ gt $endkey;

                                if ( $startkey ) {
                                        if ( $_ ge $startkey ) {
                                                $total_rows++;
                                                $_;
                                        } else {
                                                $offset++;
                                                return '';
                                        }
                                } else {
                                        $total_rows++;
                                        $_;
                                }

                        } glob( "$path/$database/*" );

                        warn "## docs $startkey -> $endkey limit $limit ", dump( @docs ); # if $debug;

                        $json = {
                                total_rows =>  $total_rows,
                                offset => $offset,
                                rows => [],
                        };

                        my $rows;
                        my @ids;

                        foreach my $id ( @docs ) {
                                warn "++ $id\n" if $debug;
                                my $p = "$path/$database/$id";
                                my $data = eval { Storable::retrieve( $p ) };
                                if ( $@ ) {
                                        warn "ERROR: $p | $@\n";
                                        next;
                                }
                                push @ids, $id;
                                $rows->{$id} = {
                                        id => $id,
                                        key => $id,
                                        value => {
                                                rev => (stat($p))[9], # mtime
                                        }
                                };
                        }

                        my $descending = delete $arg->{descending};
                        my @sorted = sort @ids;

                        warn "creating rows in ", $descending ? "descending" : "", " order\n";

                        foreach my $id ( $descending ? reverse @sorted : @sorted ) {
                                warn ">> $id ", $descending ? 'desc' : 'asc', "\n" if $debug;
                                push @{ $json->{rows} }, $rows->{$id};
                        }

                } elsif ( $method eq 'PUT' ) {
        
                        warn "## ",dump( $tx->req ) if $debug;

                        my $data = $tx->req->content->file->slurp;

                        Storable::store( from_json($data), $p );
                        warn "store $p ", -s $p, " bytes: $data\n";
                        $status = 201; # Created
        
                } elsif ( $method eq 'GET' ) {
                        if ( ! -e $p ) {
                                $status = 404;
                        } else {
                                warn "retrive $p ", -s $p, " bytes\n";
                                $json = Storable::retrieve( $p );
                        }
                } elsif ( $method eq 'DELETE' ) {
                        if ( -e $p ) {
                                unlink $p || { $status = 500 };
                        } else {
                                $status = 404;
                        }
                } else {
                        $status = 501;
                }

                warn "WARNING: arg left from $url = ",dump( $arg ),$/ if keys %$arg;

        }

        $json = { error => 'not_found', reason => 'Missing' } if $status == 404;

        if ( $method =~ m{(DELETE|PUT)} ) {
                $tx->res->headers->add_line( 'Location' => $tx->req->url->to_abs );
        }

        $tx->res->code( $status );
        $tx->res->headers->content_type( 'text/json' );
        my $body = to_json $json;
        $tx->res->body( $body );
        warn "CouchDB API: $method $url $status $body\n";

        warn "## headers ", $tx->res->headers->to_string;

        return $tx;

}

sub database_get {
        my ($db_name) = @_;
        my $path = $config->{path};
        warn "# collecting docs from $path/$db_name/*\n";
        my @docs = glob "$path/$db_name/*";
        my $json = {
                db_name => $db_name,
                doc_count => $#docs + 1,
                doc_del_count => 0,
                update_seq => 0,
                purge_seq => 0,
                capacity_running => JSON::false,
                disk_size => 0,
                instance_start_time => time(),
        };

        warn "## calculating disk_size\n";
        $json->{disk_size} += -s $_ foreach @docs;
        $status = 200;
        return $json;
}

1;
__END__

=head1 SEE ALSO

L<http://wiki.apache.org/couchdb/Reference>

1	dpavlin	1046	package Frey::CouchAPI;
2
3	dpavlin	1051	=head1 DESCRIPTION
4
5	dpavlin	1052	This is REST wrapper using following L<Mojo> implement Apache's CouchDB API
6	dpavlin	1051
7	dpavlin	1052
8			L<Mojo::URL>
9
10			L<Mojo::Transaction>
11
12
13	dpavlin	1051	=head1 Supported HTTP API
14
15			=cut
16
17	dpavlin	1049	use warnings;
18			use strict;
19
20	dpavlin	1046	use JSON;
21			use Data::Dump qw/dump/;
22			use URI::Escape;
23	dpavlin	1047	use File::Path qw(make_path remove_tree);
24			use Storable;
25	dpavlin	1046
26	dpavlin	1049	our $VERSION = '0.1';
27	dpavlin	1050	$VERSION .= ' on Frey ' . $Frey::VERSION;
28	dpavlin	1049
29			our $debug = $Frey::debug \|\| 0;
30
31	dpavlin	1046	sub rewrite_urls {
32			my ( $self, $tx ) = @_;
33			if ( $tx->req->url->path =~ m{/_utils/} ) {
34			my $path = $tx->req->url->path;
35			$path =~ s{(/_utils)/?$}{$1/index.html}; # poor man's DirectoryIndex
36			$path =~ s{/_utils}{/static/futon};
37			$tx->req->url->path( $path );
38			my $url = $tx->req->url->to_string;
39			my $old = $url;
40			$url = $tx->req->url->to_string;
41			warn "# rewrite $old -> $url\n";
42			}
43			}
44
45	dpavlin	1050	our $config = {
46			path => '/data/webpac2/var/row',
47			};
48
49			my $p = $config->{path};
50	dpavlin	1046	my @all_dbs = map {
51	dpavlin	1050	s{^\Q$p\E/*}{};
52	dpavlin	1046	$_;
53	dpavlin	1050	} glob "$p//";
54	dpavlin	1046
55	dpavlin	1047	my $regex_dbs = '[a-z][a-z0-9_\$\(\)\+\-/]+';
56	dpavlin	1046
57	dpavlin	1047	our $json = {};
58	dpavlin	1052	our $status;
59	dpavlin	1047
60			sub ok {
61			$json = { ok => JSON::true };
62			$status = 200;
63	dpavlin	1052	warn "ok\n";
64	dpavlin	1047	}
65
66	dpavlin	1050
67	dpavlin	1046	sub dispatch {
68			my ($self,$tx) = @_;
69
70	dpavlin	1052	$status = 500; # Internal Error
71
72	dpavlin	1046	my $url = $tx->req->url->to_string;
73			$url = uri_unescape( $url );
74	dpavlin	1047	my $method = $tx->req->method;
75	dpavlin	1050
76	dpavlin	1046	if ( $url eq '/' ) {
77			$json = {
78	dpavlin	1047	couchdb => "Welcome",
79	dpavlin	1050	version => "CouchAPI $VERSION",
80	dpavlin	1052	};
81			$status = 200;
82	dpavlin	1046	} elsif ( $url eq '/_all_dbs' ) {
83			$json = [ @all_dbs ];
84	dpavlin	1047	$status = 200;
85	dpavlin	1050	} elsif ( $url =~ m{^/_config/?(.+)} ) {
86
87			$json = { CouchAPI => $config };
88
89			if ( $method eq 'PUT' ) {
90
91			my $part = $1;
92			warn "## part $part";
93
94			$part =~ s!^!->{'!;
95			$part =~ s!/!'}->{'!;
96			$part =~ s/$/'}/;
97
98			my $data = $tx->req->content->file->slurp;
99			$data = JSON->new->allow_nonref->decode( $data );
100			warn "## data ",dump( $data );
101			# poor man's transaction :-)
102			my $code = "\$json$part = \$data; \$config$part = \$data;";
103			eval $code;
104			if ( $@ ) {
105			warn "ERROR: $code -> $@";
106			$status = 500;
107			} else {
108			$status = 200;
109	dpavlin	1049	}
110	dpavlin	1050
111			warn "json ",dump( $json ), " config ", dump( $config );
112
113			} elsif ( $method eq 'GET' ) {
114			$status = 200;
115			} else {
116			$status = 501;
117			}
118
119	dpavlin	1047	} elsif ( $url =~ m{($regex_dbs)/$} ) {
120	dpavlin	1046
121	dpavlin	1051	=head2 Database
122
123			L<http://wiki.apache.org/couchdb/HTTP_database_API> except compaction
124
125			=cut
126
127	dpavlin	1047	my $database = $1;
128	dpavlin	1050	my $dir = "$config->{path}/$database";
129	dpavlin	1047
130			if ( $method eq 'GET' ) {
131			$json = database_get( $database );
132			} elsif ( $method eq 'DELETE' ) {
133			if ( ! -e $dir ) {
134			$status = 404;
135			} else {
136	dpavlin	1052	remove_tree($dir) && ok \|\| { $status = 500 };
137	dpavlin	1047	}
138			} elsif ( $method eq 'PUT' ) {
139			if ( ! -e $dir ) {
140	dpavlin	1052	make_path($dir) && ok && warn "created $dir" \|\| { $status = 500 };
141	dpavlin	1047	} else {
142			$status = 412;
143			}
144			}
145
146	dpavlin	1049	} elsif ( $url =~ m{($regex_dbs)/([^?]+)\??(.+)?$} ) {
147			my ($database,$id,$args) = ($1,$2,$3);
148
149	dpavlin	1051	=head2 Document
150
151			L<http://wiki.apache.org/couchdb/HTTP_Document_API>
152
153			=cut
154
155	dpavlin	1049	my $arg;
156			if ( $args ) {
157			foreach my $a ( split(/[&;]/,$args) ) {
158			my ($n,$v) = split(/=/,$a);
159			$v =~ s{(["'])(.+)\1}{$2};
160			$arg->{$n} = $v;
161			}
162			}
163	dpavlin	1050
164			my $path = $config->{path};
165			warn "ERROR: path $path doesn't exist\n" unless -e $path;
166
167	dpavlin	1047	my $p = "$path/$database/$id";
168	dpavlin	1051	warn "## database: $database id: $id -> $p ", dump( $arg ),"\n";
169	dpavlin	1047
170
171	dpavlin	1049	if ( $id =~ m{_all_docs(\w+)?$} ) {
172
173			my $by = $1;
174			my $offset = 0;
175			my $startkey = delete $arg->{startkey};
176	dpavlin	1051	my $endkey = delete $arg->{endkey};
177			my $limit = delete $arg->{limit};
178	dpavlin	1049	my $total_rows = 0;
179
180			my @docs = grep { length $_ } map {
181	dpavlin	1051	return '' if defined $limit && $total_rows == $limit;
182
183	dpavlin	1047	s{^$path/$database/}{};
184	dpavlin	1051	return '' if defined $endkey && $_ gt $endkey;
185
186	dpavlin	1049	if ( $startkey ) {
187	dpavlin	1051	if ( $_ ge $startkey ) {
188	dpavlin	1049	$total_rows++;
189			$_;
190			} else {
191			$offset++;
192	dpavlin	1051	return '';
193	dpavlin	1049	}
194			} else {
195			$total_rows++;
196			$_;
197			}
198	dpavlin	1051
199	dpavlin	1047	} glob( "$path/$database/*" );
200
201	dpavlin	1051	warn "## docs $startkey -> $endkey limit $limit ", dump( @docs ); # if $debug;
202	dpavlin	1047
203			$json = {
204	dpavlin	1049	total_rows => $total_rows,
205			offset => $offset,
206	dpavlin	1047	rows => [],
207			};
208
209	dpavlin	1049	my $rows;
210			my @ids;
211
212	dpavlin	1047	foreach my $id ( @docs ) {
213	dpavlin	1049	warn "++ $id\n" if $debug;
214	dpavlin	1047	my $p = "$path/$database/$id";
215	dpavlin	1049	my $data = eval { Storable::retrieve( $p ) };
216			if ( $@ ) {
217			warn "ERROR: $p \| $@\n";
218			next;
219			}
220			push @ids, $id;
221			$rows->{$id} = {
222	dpavlin	1047	id => $id,
223			key => $id,
224			value => {
225			rev => (stat($p))[9], # mtime
226			}
227			};
228			}
229
230	dpavlin	1049	my $descending = delete $arg->{descending};
231			my @sorted = sort @ids;
232
233	dpavlin	1050	warn "creating rows in ", $descending ? "descending" : "", " order\n";
234
235	dpavlin	1049	foreach my $id ( $descending ? reverse @sorted : @sorted ) {
236	dpavlin	1050	warn ">> $id ", $descending ? 'desc' : 'asc', "\n" if $debug;
237	dpavlin	1049	push @{ $json->{rows} }, $rows->{$id};
238			}
239
240	dpavlin	1047	} elsif ( $method eq 'PUT' ) {
241
242	dpavlin	1049	warn "## ",dump( $tx->req ) if $debug;
243	dpavlin	1047
244			my $data = $tx->req->content->file->slurp;
245
246			Storable::store( from_json($data), $p );
247			warn "store $p ", -s $p, " bytes: $data\n";
248	dpavlin	1052	$status = 201; # Created
249
250	dpavlin	1047	} elsif ( $method eq 'GET' ) {
251	dpavlin	1049	if ( ! -e $p ) {
252			$status = 404;
253			} else {
254			warn "retrive $p ", -s $p, " bytes\n";
255			$json = Storable::retrieve( $p );
256			}
257			} elsif ( $method eq 'DELETE' ) {
258			if ( -e $p ) {
259	dpavlin	1052	unlink $p \|\| { $status = 500 };
260	dpavlin	1049	} else {
261			$status = 404;
262			}
263	dpavlin	1047	} else {
264			$status = 501;
265			}
266
267	dpavlin	1049	warn "WARNING: arg left from $url = ",dump( $arg ),$/ if keys %$arg;
268
269	dpavlin	1046	}
270
271	dpavlin	1052	$json = { error => 'not_found', reason => 'Missing' } if $status == 404;
272
273			if ( $method =~ m{(DELETE\|PUT)} ) {
274			$tx->res->headers->add_line( 'Location' => $tx->req->url->to_abs );
275	dpavlin	1047	}
276
277			$tx->res->code( $status );
278	dpavlin	1046	$tx->res->headers->content_type( 'text/json' );
279	dpavlin	1047	my $body = to_json $json;
280			$tx->res->body( $body );
281			warn "CouchDB API: $method $url $status $body\n";
282	dpavlin	1052
283			warn "## headers ", $tx->res->headers->to_string;
284
285	dpavlin	1046	return $tx;
286
287			}
288
289	dpavlin	1047	sub database_get {
290			my ($db_name) = @_;
291	dpavlin	1050	my $path = $config->{path};
292	dpavlin	1047	warn "# collecting docs from $path/$db_name/*\n";
293			my @docs = glob "$path/$db_name/*";
294			my $json = {
295			db_name => $db_name,
296			doc_count => $#docs + 1,
297			doc_del_count => 0,
298			update_seq => 0,
299			purge_seq => 0,
300			capacity_running => JSON::false,
301			disk_size => 0,
302			instance_start_time => time(),
303			};
304
305			warn "## calculating disk_size\n";
306	dpavlin	1049	$json->{disk_size} += -s $_ foreach @docs;
307	dpavlin	1047	$status = 200;
308			return $json;
309			}
310
311	dpavlin	1046	1;
312	dpavlin	1051	__END__
313
314			=head1 SEE ALSO
315
316			L<http://wiki.apache.org/couchdb/Reference>
317