OpenSRF/src/perlmods/OpenSRF/Application.pm

   1 package OpenSRF::Application;
   2 use vars qw/$_app $log @_METHODS $thunk $server_class/;
   3
   4 use base qw/OpenSRF/;
   5 use OpenSRF::AppSession;
   6 use OpenSRF::DomainObject::oilsMethod;
   7 use OpenSRF::DomainObject::oilsResponse qw/:status/;
   8 use OpenSRF::Utils::Logger qw/:level/;
   9 use Data::Dumper;
  10 use Time::HiRes qw/time/;
  11 use OpenSRF::EX qw/:try/;
  12 #use OpenSRF::UnixServer;  # to get the server class from UnixServer::App
  13
  14 sub DESTROY{};
  15
  16 use strict;
  17 use warnings;
  18
  19 $log = 'OpenSRF::Utils::Logger';
  20
  21 our $in_request = 0;
  22 our @pending_requests;
  23
  24 sub server_class {
  25         my $class = shift;
  26         if($class) {
  27                 $server_class = $class;
  28         }
  29         return $server_class;
  30 }
  31
  32 sub thunk {
  33         my $self = shift;
  34         my $flag = shift;
  35         $thunk = $flag if (defined $flag);
  36         return $thunk;
  37 }
  38
  39 sub application_implementation {
  40         my $self = shift;
  41         my $app = shift;
  42
  43         if (defined $app) {
  44                 $_app = $app;
  45                 eval "use $_app;";
  46                 if( $@ ) {
  47                         $log->error( "Error loading application_implementation: $app -> $@", ERROR);
  48                 }
  49
  50         }
  51
  52         return $_app;
  53 }
  54
  55 sub handler {
  56         my ($self, $session, $app_msg) = @_;
  57
  58         if( ! $app_msg ) {
  59                 return 0;  # error?
  60         }
  61
  62         $log->debug( "In Application::handler()", DEBUG );
  63
  64         my $app = $self->application_implementation;
  65
  66         if( $app ) {
  67                 $log->debug( "Application is $app", DEBUG);
  68         }
  69         $log->debug( "Message is ".$app_msg->toString(1), INTERNAL);
  70
  71
  72         if ($session->last_message_type eq 'REQUEST') {
  73                 $log->debug( "We got a REQUEST: ". $app_msg->method, INFO );
  74
  75                 my $method_name = $app_msg->method;
  76                 $log->debug( " * Looking up $method_name inside $app", DEBUG);
  77
  78                 my $method_proto = $session->last_message_api_level;
  79                 $log->debug( " * Method API Level [$method_proto]", DEBUG);
  80
  81                 my $coderef = $app->method_lookup( $method_name, $method_proto );
  82
  83                 unless ($coderef) {
  84                         $session->status( OpenSRF::DomainObject::oilsMethodException->new() );
  85                         return 1;
  86                 }
  87
  88                 $log->debug( " (we got coderef $coderef", DEBUG);
  89
  90                 unless ($session->continue_request) {
  91                         $session->status(
  92                                 OpenSRF::DomainObject::oilsConnectStatus->new(
  93                                                 statusCode => STATUS_REDIRECTED(),
  94                                                 status => 'Disconnect on max requests' ) );
  95                         $session->kill_me;
  96                         return 1;
  97                 }
  98
  99                 if (ref $coderef) {
 100                         my @args = $app_msg->params;
 101                         my $appreq = OpenSRF::AppRequest->new( $session );
 102
 103                         $log->debug( "in_request = $in_request : [" . $appreq->threadTrace."]", DEBUG );
 104                         if( $in_request ) {
 105                                 $log->debug( "Pushing onto pending requests: " . $appreq->threadTrace, DEBUG );
 106                                 push @pending_requests, [ $appreq, \@args, $coderef ];
 107                                 return 1;
 108                         }
 109
 110
 111                         $in_request++;
 112
 113                         $log->debug( "Executing coderef for {$method_name -> ".join(', ', @args)."}", INTERNAL );
 114
 115                         my $resp;
 116                         try {
 117                                 my $start = time();
 118                                 $resp = $coderef->run( $appreq, @args);
 119                                 my $time = sprintf '%.3f', time() - $start;
 120                                 $log->debug( "Method duration for {$method_name -> ".join(', ', @args)."}:  ". $time, DEBUG );
 121                                 if( ref( $resp ) ) {
 122                                         #$log->debug( "Calling respond_complete: ". $resp->toString(), INTERNAL );
 123                                         $appreq->respond_complete( $resp );
 124                                 } else {
 125                                         $appreq->status( OpenSRF::DomainObject::oilsConnectStatus->new(
 126                                                                 statusCode => STATUS_COMPLETE(),
 127                                                                 status => 'Request Complete' ) );
 128                                 }
 129                         } catch Error with {
 130                                 my $e = shift;
 131                                 $e = $e->{-text} || $e->message if (ref $e);
 132                                 my $sess_id = $session->session_id;
 133                                 $session->status(
 134                                         OpenSRF::DomainObject::oilsMethodException->new(
 135                                                         statusCode      => STATUS_INTERNALSERVERERROR(),
 136                                                         status          => " *** Call to [$method_name] failed for session ".
 137                                                                            "[$sess_id], thread trace [".$appreq->threadTrace."]:\n".$e
 138                                         )
 139                                 );
 140                         };
 141
 142
 143
 144                         # ----------------------------------------------
 145
 146
 147                         # XXX may need this later
 148                         # $_->[1] = 1 for (@OpenSRF::AppSession::_CLIENT_CACHE);
 149
 150                         $in_request--;
 151
 152                         $log->debug( "Pending Requests: " . scalar(@pending_requests), INTERNAL );
 153
 154                         # cycle through queued requests
 155                         while( my $aref = shift @pending_requests ) {
 156                                 $in_request++;
 157                                 my $resp;
 158                                 try {
 159                                         my $start = time;
 160                                         my $response = $aref->[2]->run( $aref->[0], @{$aref->[1]} );
 161                                         my $time = sprintf '%.3f', time - $start;
 162                                         $log->debug( "Method duration for {[".$aref->[2]->name." -> ".join(', ',@{$aref->[1]}).'}:  '.$time, DEBUG );
 163
 164                                         $appreq = $aref->[0];
 165                                         if( ref( $response ) ) {
 166                                                 $log->debug( "Calling respond_complete: ". $response->toString(), INTERNAL );
 167                                                 $appreq->respond_complete( $response );
 168                                         } else {
 169                                                 $appreq->status( OpenSRF::DomainObject::oilsConnectStatus->new(
 170                                                                         statusCode => STATUS_COMPLETE(),
 171                                                                         status => 'Request Complete' ) );
 172                                         }
 173                                         $log->debug( "Executed: " . $appreq->threadTrace, DEBUG );
 174                                 } catch Error with {
 175                                         my $e = shift;
 176                                         $session->status(
 177                                                 OpenSRF::DomainObject::oilsMethodException->new(
 178                                                                 statusCode => STATUS_INTERNALSERVERERROR(),
 179                                                                 status => "Call to [".$aref->[2]->name."] faild:  ".$e->{-text}
 180                                                 )
 181                                         );
 182                                 };
 183                                 $in_request--;
 184                         }
 185
 186                         return 1;
 187                 }
 188                 my $res = OpenSRF::DomainObject::oilsMethodException->new;
 189                 $session->send('ERROR', $res);
 190                 $session->kill_me;
 191                 return 1;
 192
 193         } else {
 194                 $log->debug( "Pushing ". $app_msg->toString ." onto queue", INTERNAL );
 195                 $session->push_queue([ $app_msg, $session->last_threadTrace ]);
 196         }
 197
 198         $session->last_message_type('');
 199         $session->last_message_api_level('');
 200
 201         return 1;
 202 }
 203
 204 sub register_method {
 205         my $self = shift;
 206         my $app = ref($self) || $self;
 207         my %args = @_;
 208
 209
 210         throw OpenSRF::DomainObject::oilsMethodException unless ($args{method});
 211
 212         $args{api_level} ||= 1;
 213         $args{stream} ||= 0;
 214         $args{remote} ||= 0;
 215    $args{package} = $app;
 216         $args{server_class} = server_class();
 217         $args{api_name} ||= $args{server_class} . '.' . $args{method};
 218
 219         $_METHODS[$args{api_level}]{$args{api_name}} = bless \%args => $app;
 220
 221         __PACKAGE__->register_method(
 222                 stream => 0,
 223                 api_name => $args{api_name}.'.atomic',
 224                 method => 'make_stream_atomic'
 225         ) if ($args{stream});
 226 }
 227
 228 sub retrieve_remote_apis {
 229         my $session = AppSession->create('settings');
 230         try {
 231                 $session->connect;
 232         } catch Error with {
 233                 my $e = shift;
 234                 $log->debug( "Remote subrequest returned an error:\n". $e );
 235                 return undef;
 236         } finally {
 237                 return undef unless ($session->state == $session->CONNECTED);
 238         };
 239
 240         my $req = $session->request( 'opensrf.settings.xpath.get' );
 241         my $list = $req->recv->content;
 242         $req->finish;
 243         $session->finish;
 244         $session->disconnect;
 245
 246         my %u_list = map { ($_ => 1) } @$list;
 247
 248         for my $class ( keys %u_list ) {
 249                 populate_remote_method_cache($class);
 250         }
 251 }
 252
 253 sub populate_remote_method_cache {
 254         my $class = shift;
 255
 256         my $session = AppSession->create($class);
 257         try {
 258                 $session->connect;
 259         } catch Error with {
 260                 my $e = shift;
 261                 $log->debug( "Remote subrequest returned an error:\n". $e );
 262                 return undef;
 263         } finally {
 264                 return undef unless ($session->state == $session->CONNECTED);
 265         };
 266
 267         my $req = $session->request( 'opensrf.settings.xpath.get' );
 268
 269         while (my $method = $req->recv->content) {
 270                 $method->{remote} = 1;
 271                 $_METHODS[$$method{api_level}]{$$method{api_name}} = $method;
 272         }
 273
 274         $req->finish;
 275         $session->finish;
 276         $session->disconnect;
 277 }
 278
 279 sub method_lookup {
 280         my $self = shift;
 281         my $method = shift;
 282         my $proto = shift;
 283         my $no_recurse = shift || 0;
 284
 285         # this instead of " || 1;" above to allow api_level 0
 286         $proto = 1 unless (defined $proto);
 287
 288         my $class = ref($self) || $self;
 289
 290         $log->debug("Lookup of [$method] by [$class]", DEBUG);
 291         $log->debug("Available methods\n".Dumper(\@_METHODS), INTERNAL);
 292
 293         my $meth;
 294         if (__PACKAGE__->thunk) {
 295                 for my $p ( reverse(1 .. $proto) ) {
 296                         if (exists $_METHODS[$p]{$method}) {
 297                                 $meth = $_METHODS[$p]{$method};
 298                         }
 299                 }
 300         } else {
 301                 if (exists $_METHODS[$proto]{$method}) {
 302                         $meth = $_METHODS[$proto]{$method};
 303                 }
 304         }
 305
 306         if (defined $meth) {
 307                 $log->debug("Looks like we found [$method]!", DEBUG);
 308                 $log->debug("Method object is ".Dumper($meth), INTERNAL);
 309         } elsif (0 and !$no_recurse) {
 310                 retrieve_remote_apis();
 311                 $self->method_lookup($method,$proto,1);
 312         }
 313
 314         return $meth;
 315 }
 316
 317 sub run {
 318         my $self = shift;
 319         my $req = shift;
 320
 321         my $resp;
 322
 323         if ( !UNIVERSAL::isa($req, 'OpenSRF::AppRequest') ) {
 324                 $log->debug("Creating a SubRequest object", DEBUG);
 325                 unshift @_, $req;
 326                 $req = OpenSRF::AppSubrequest->new;
 327         } else {
 328                 $log->debug("This is a top level request", DEBUG);
 329         }
 330
 331         if (!$self->{remote}) {
 332                 my $code ||= \&{$self->{package} . '::' . $self->{method}};
 333                 $resp = $code->($self, $req, @_);
 334
 335                 if ( ref($req) and UNIVERSAL::isa($req, 'OpenSRF::AppSubrequest') ) {
 336                         $req->respond($resp) if (defined $resp);
 337                         return $req->responses;
 338                 } else {
 339                         $log->debug("A top level Request object is responding $resp", DEBUG);
 340                         return $resp;
 341                 }
 342         } else {
 343                 my $session = AppSession->create($self->{server_class});
 344                 try {
 345                         $session->connect;
 346                 } catch Error with {
 347                         my $e = shift;
 348                         $log->debug( "Remote subrequest returned an error:\n". $e );
 349                         return undef;
 350                 } finally {
 351                         return undef unless ($session->state == $session->CONNECTED);
 352                 };
 353
 354                 my $remote_req = $session->request( $self->{api_name}, @_ );
 355                 while (my $remote_resp = $remote_req->recv->content) {
 356                         $req->respond( $remote_resp );
 357                 }
 358                 return $req->responses;
 359         }
 360         # huh? how'd we get here...
 361         return undef;
 362 }
 363
 364 sub introspect {
 365         my $self = shift;
 366         my $client = shift;
 367
 368         for my $api_level ( 1 .. $#_METHODS ) {
 369                 $client->respond( { $api_level => $_METHODS[$api_level] } );
 370         }
 371
 372         return undef;
 373 }
 374 __PACKAGE__->register_method(
 375         stream => 1,
 376         method => 'introspect',
 377         api_name => 'opensrf.system.method_list'
 378 );
 379
 380 sub make_stream_atomic {
 381         my $self = shift;
 382         my $req = shift;
 383         my @args = @_;
 384
 385         (my $m_name = $self->api_name) =~ s/\.atomic$//o;
 386         my @results = $self->method_lookup($m_name)->run(@args);
 387
 388         if (@results == 1) {
 389                 return $results[0];
 390         }
 391         return \@results;
 392 }
 393
 394
 395 1;