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package Frey::CouchAPI; |
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|
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=head1 DESCRIPTION |
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|
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This is REST wrapper using following L<Mojo> implement Apache's CouchDB API |
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|
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|
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L<Mojo::URL> |
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|
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L<Mojo::Transaction> |
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|
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|
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=head1 Supported HTTP API |
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|
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=cut |
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|
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use warnings; |
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use strict; |
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|
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use JSON; |
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use Data::Dump qw/dump/; |
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use URI::Escape; |
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use File::Path qw(make_path remove_tree); |
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use Storable; |
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|
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our $VERSION = '0.3'; |
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$VERSION .= " (Frey $Frey::VERSION)" if $Frey::VERSION; |
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|
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our $debug = $Frey::debug || 0; |
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|
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sub rewrite_urls { |
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my ( $self, $tx ) = @_; |
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if ( $tx->req->url->path =~ m{/_utils/} ) { |
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my $path = $tx->req->url->path; |
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$path =~ s{(/_utils)/?$}{$1/index.html}; # poor man's DirectoryIndex |
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$path =~ s{/_utils}{/static/futon}; |
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$tx->req->url->path( $path ); |
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my $url = $tx->req->url->to_string; |
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my $old = $url; |
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$url = $tx->req->url->to_string; |
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warn "# rewrite $old -> $url\n"; |
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} |
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} |
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|
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our $config = { |
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database => { |
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path => '/data/webpac2/var/row', |
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name_glob => '/*/*', |
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} |
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}; |
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|
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my $regex_dbs = '[a-z][a-z0-9_\$\(\)\+\-/]+'; |
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|
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our $json = {}; |
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our $status; |
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|
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sub ok { |
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$json = { ok => JSON::true }; |
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$status = 200; |
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warn "ok from ",join(' ',caller),$/; |
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} |
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|
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sub file_rev { (stat($_[0]))[9] } # mtime |
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|
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sub data_from_tx { |
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my $tx = shift; |
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my $data = $tx->req->content->file->slurp; |
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$data = JSON->new->allow_nonref->decode( $data ); |
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warn "## data ",dump( $data ); |
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return $data; |
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} |
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|
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sub dispatch { |
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my ($self,$tx) = @_; |
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|
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$status = 500; # Internal Error |
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|
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my $url = $tx->req->url->to_string; |
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$url = uri_unescape( $url ); |
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my $method = $tx->req->method; |
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my $path = $config->{database}->{path}; |
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|
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if ( $url eq '/' ) { |
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$json = { |
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couchdb => "Welcome", |
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version => "CouchAPI $VERSION", |
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}; |
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$status = 200; |
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} elsif ( $url eq '/_all_dbs' ) { |
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$json = [ |
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map { |
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s{^\Q$path\E/*}{}; |
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$_; |
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} glob $path . $config->{database}->{name_glob} |
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]; |
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$status = 200; |
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} elsif ( $url =~ m{^/_config/?(.+)} ) { |
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$json = $config; |
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|
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if ( $method eq 'PUT' ) { |
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|
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my $part = $1; |
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my $data = data_from_tx( $tx ); |
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warn "## part $part = $data\n"; |
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$part =~ s!/!'}->{'!; |
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|
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# poor man's transaction :-) |
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my $code = "\$config->{'$part'} = \$data;"; |
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eval $code; |
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if ( $@ ) { |
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warn "ERROR: $code -> $@"; |
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$status = 500; |
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} else { |
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$status = 200; |
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} |
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warn "# config after $code is ",dump( $config ),$/; |
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|
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} elsif ( $method eq 'GET' ) { |
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$status = 200; |
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} else { |
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$status = 501; |
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} |
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|
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=head2 Database |
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L<http://wiki.apache.org/couchdb/HTTP_database_API> except compaction |
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|
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=cut |
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|
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} elsif ( |
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$url =~ m{($regex_dbs)/$} |
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# DELETE doesn't have trailing slash |
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|| $method eq 'DELETE' && $url =~ m{($regex_dbs)$} |
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) { |
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my $database = $1; |
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|
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my $dir = "$path/$database"; |
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|
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if ( $method eq 'GET' ) { |
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$json = database_get( $database ); |
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} elsif ( $method eq 'DELETE' ) { |
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if ( ! -e $dir ) { |
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$status = 404; |
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} else { |
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remove_tree($dir); |
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if ( ! -d $dir ) { |
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ok; |
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} else { |
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$status = 500; |
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} |
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} |
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} elsif ( $method eq 'PUT' ) { |
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if ( -e $dir ) { |
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$status = 412; |
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} else { |
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make_path($dir); |
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if ( -e $path ) { |
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ok; |
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$status = 201; |
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} else { |
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$status = 500; |
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} |
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} |
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} |
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warn "## database $database $status ",dump( $json ); |
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|
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} elsif ( $url =~ m{($regex_dbs)/([^?]+)\??(.+)?$} ) { |
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my ($database,$id,$args) = ($1,$2,$3); |
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|
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=head2 Document |
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|
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L<http://wiki.apache.org/couchdb/HTTP_Document_API> |
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|
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=cut |
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my $arg; |
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if ( $args ) { |
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foreach my $a ( split(/[&;]/,$args) ) { |
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my ($n,$v) = split(/=/,$a); |
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$v =~ s{(["'])(.+)\1}{$2}; |
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$arg->{$n} = $v; |
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} |
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} |
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warn "ERROR: path $path doesn't exist\n" unless -e $path; |
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my $p = "$path/$database/$id"; |
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warn "## database: $database id: $id -> $p ", dump( $arg ),"\n"; |
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if ( $id =~ m{_all_docs(\w*)$} ) { |
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my $by = $1; |
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my $offset = 0; |
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my $startkey = delete $arg->{startkey}; |
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$startkey ||= delete $arg->{startkey_docid}; # XXX key == id |
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my $endkey = delete $arg->{endkey}; |
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my $limit = delete $arg->{limit}; |
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my $skip = delete $arg->{skip}; |
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my $total_rows = 0; |
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my $collected_rows = 0; |
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my @docs = grep { length $_ } map { |
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$total_rows++; |
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if ( $limit > 0 && $collected_rows == $limit ) { |
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''; |
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} else { |
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s{^$path/$database/}{}; |
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if ( defined $endkey && $_ gt $endkey ) { |
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''; |
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} elsif ( $startkey ) { |
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if ( $_ ge $startkey ) { |
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$collected_rows++; |
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$_; |
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} else { |
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$offset++; |
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''; |
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} |
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} else { |
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$collected_rows++; |
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$_; |
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} |
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} |
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|
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} glob( "$path/$database/*" ); |
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$offset += $skip if $skip; |
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warn "## docs $startkey -> $endkey limit $limit ", dump( @docs ); # if $debug; |
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$json = { |
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total_rows => $total_rows, |
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offset => $offset, |
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rows => [], |
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}; |
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my $rows; |
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my @ids; |
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|
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foreach my $id ( @docs ) { |
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warn "++ $id\n" if $debug; |
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my $p = "$path/$database/$id"; |
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my $data = eval { Storable::retrieve( $p ) }; |
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if ( $@ ) { |
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warn "ERROR: $p | $@\n"; |
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next; |
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} |
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push @ids, $id; |
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$rows->{$id} = { |
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id => $id, |
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key => $id, |
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value => { |
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rev => file_rev $p, |
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} |
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}; |
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} |
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my $descending = delete $arg->{descending}; |
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my @sorted = sort @ids; |
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warn "creating rows in ", $descending ? "descending" : "", " order\n"; |
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foreach my $id ( $descending ? reverse @sorted : @sorted ) { |
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warn ">> $id ", $descending ? 'desc' : 'asc', "\n" if $debug; |
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push @{ $json->{rows} }, $rows->{$id}; |
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} |
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$status = 200; |
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} elsif ( $method eq 'PUT' ) { |
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warn "## ",dump( $tx->req ) if $debug; |
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my $data = $tx->req->content->file->slurp; |
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my $db_path = "$path/$database"; |
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make_path $db_path unless -e $db_path; |
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Storable::store( from_json($data), $p ); |
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my $rev = file_rev $p; |
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warn "store $p $rev size ", -s $p, " bytes | $data\n"; |
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$status = 201; # Created |
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$json = { |
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id => $id, |
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ok => JSON::true, |
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rev => $rev, |
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}; |
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|
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} elsif ( $method eq 'GET' ) { |
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if ( ! -e $p ) { |
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$status = 404; |
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} else { |
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warn "retrive $p ", -s $p, " bytes\n"; |
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$json = Storable::retrieve( $p ); |
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if ( delete $arg->{revs_info} ) { |
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my $rev = file_rev $p; |
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$json->{_rev} = $rev; |
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$json->{_revs_info} = [ |
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{ rev => $rev, status => 'available' } |
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]; |
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} |
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$status = 200; |
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|
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} |
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} elsif ( $method eq 'DELETE' ) { |
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if ( -e $p ) { |
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unlink $p && ok || { $status = 500 }; |
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} else { |
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$status = 404; |
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} |
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} elsif ( $method eq 'POST' ) { |
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my $data = data_from_tx( $tx ); |
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# FIXME implement real view server and return 200 |
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$json = { total_rows => 0, offset => 0 }; |
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$status = 202; |
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|
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} else { |
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$status = 501; |
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} |
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|
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if ( keys %$arg ) { |
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warn "WARNING: arg left from $url = ",dump( $arg ),$/; |
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$status = 501; |
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} |
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|
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} |
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|
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$json = { error => 'not_found', reason => 'Missing' } if $status == 404; |
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|
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if ( $method =~ m{(DELETE|PUT)} ) { |
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$tx->res->headers->add_line( 'Location' => $tx->req->url->to_abs ); |
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} |
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|
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$tx->res->code( $status ); |
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$tx->res->headers->content_type( 'text/plain;charset=utf-8' ); |
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my $body = to_json $json; |
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$tx->res->body( $body ); |
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$tx->res->headers->add_line( 'Cache-Control' => 'must-revalidate' ); |
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$tx->res->headers->add_line( 'Server' => "Frey::CouchAPI/$VERSION" ); |
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|
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print "$method $url $status\n$body\n"; |
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|
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warn "## headers ", $tx->res->headers->to_string; |
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|
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return $tx; |
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|
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} |
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|
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sub database_get { |
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my ($db_name) = @_; |
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my $path = $config->{database}->{path} || die; |
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warn "# collecting docs from $path/$db_name/*\n"; |
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my @docs = glob "$path/$db_name/*"; |
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my $json = { |
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db_name => $db_name, |
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doc_count => $#docs + 1, |
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doc_del_count => 0, |
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update_seq => 0, |
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purge_seq => 0, |
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capacity_running => JSON::false, |
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disk_size => 0, |
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instance_start_time => time(), |
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}; |
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|
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warn "## calculating disk_size\n"; |
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$json->{disk_size} += -s $_ foreach @docs; |
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$status = 200; |
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return $json; |
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} |
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|
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1; |
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__END__ |
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|
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=head1 SEE ALSO |
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|
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L<http://wiki.apache.org/couchdb/Reference> |
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|
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