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 Carp;
  13 #use OpenSRF::UnixServer;  # to get the server class from UnixServer::App
  14
  15 sub DESTROY{};
  16
  17 use strict;
  18 use warnings;
  19
  20 $log = 'OpenSRF::Utils::Logger';
  21
  22 our $in_request = 0;
  23 our @pending_requests;
  24
  25 sub package {
  26         my $self = shift;
  27         return 1 unless ref($self);
  28         return $self->{package};
  29 }
  30
  31 sub api_name {
  32         my $self = shift;
  33         return 1 unless ref($self);
  34         return $self->{api_name};
  35 }
  36
  37 sub api_level {
  38         my $self = shift;
  39         return 1 unless ref($self);
  40         return $self->{api_level};
  41 }
  42
  43 sub server_class {
  44         my $class = shift;
  45         if($class) {
  46                 $server_class = $class;
  47         }
  48         return $server_class;
  49 }
  50
  51 sub thunk {
  52         my $self = shift;
  53         my $flag = shift;
  54         $thunk = $flag if (defined $flag);
  55         return $thunk;
  56 }
  57
  58 sub application_implementation {
  59         my $self = shift;
  60         my $app = shift;
  61
  62         if (defined $app) {
  63                 $_app = $app;
  64                 eval "use $_app;";
  65                 if( $@ ) {
  66                         $log->error( "Error loading application_implementation: $app -> $@", ERROR);
  67                 }
  68
  69         }
  70
  71         return $_app;
  72 }
  73
  74 sub handler {
  75         my ($self, $session, $app_msg) = @_;
  76
  77         if( ! $app_msg ) {
  78                 return 1;  # error?
  79         }
  80
  81         $log->debug( "In Application::handler()", DEBUG );
  82
  83         my $app = $self->application_implementation;
  84
  85         if( $app ) {
  86                 $log->debug( "Application is $app", DEBUG);
  87         }
  88
  89         if ($session->last_message_type eq 'REQUEST') {
  90                 $log->debug( "We got a REQUEST: ". $app_msg->method);
  91
  92                 my $method_name = $app_msg->method;
  93                 $log->debug( " * Looking up $method_name inside $app", DEBUG);
  94
  95                 my $method_proto = $session->last_message_api_level;
  96                 $log->debug( " * Method API Level [$method_proto]", DEBUG);
  97
  98                 my $coderef = $app->method_lookup( $method_name, $method_proto, 1, 1 );
  99
 100                 unless ($coderef) {
 101                         $session->status( OpenSRF::DomainObject::oilsMethodException->new(
 102                                                 statusCode => STATUS_NOTFOUND(),
 103                                                 status => "Method [$method_name] not found for $app"));
 104                         return 1;
 105                 }
 106
 107                 $log->debug( " (we got coderef $coderef", DEBUG);
 108
 109                 unless ($session->continue_request) {
 110                         $session->status(
 111                                 OpenSRF::DomainObject::oilsConnectStatus->new(
 112                                                 statusCode => STATUS_REDIRECTED(),
 113                                                 status => 'Disconnect on max requests' ) );
 114                         $session->kill_me;
 115                         return 1;
 116                 }
 117
 118                 if (ref $coderef) {
 119                         my @args = $app_msg->params;
 120                         my $appreq = OpenSRF::AppRequest->new( $session );
 121
 122                         $log->debug( "in_request = $in_request : [" . $appreq->threadTrace."]", DEBUG );
 123                         if( $in_request ) {
 124                                 $log->debug( "Pushing onto pending requests: " . $appreq->threadTrace, DEBUG );
 125                                 push @pending_requests, [ $appreq, \@args, $coderef ];
 126                                 return 1;
 127                         }
 128
 129
 130                         $in_request++;
 131
 132                         $log->debug( "Executing coderef for {$method_name}", INTERNAL );
 133
 134                         my $resp;
 135                         try {
 136                                 my $start = time();
 137                                 warn "About to run...\n";
 138                                 $resp = $coderef->run( $appreq, @args);
 139                                 warn "Done running...\n";
 140                                 my $time = sprintf '%.3f', time() - $start;
 141                                 $log->debug( "Method duration for {$method_name}:  ". $time, INFO );
 142                                 if( defined( $resp ) ) {
 143                                         $appreq->respond_complete( $resp );
 144                                 } else {
 145                                         $appreq->status( OpenSRF::DomainObject::oilsConnectStatus->new(
 146                                                                 statusCode => STATUS_COMPLETE(),
 147                                                                 status => 'Request Complete' ) );
 148                                 }
 149                         } catch Error with {
 150                                 my $e = shift;
 151                                 warn "Caught error from 'run' method: $e\n";
 152
 153                                 if(UNIVERSAL::isa($e,"Error")) {
 154                                         $e = $e->stringify();
 155                                 }
 156                                 my $sess_id = $session->session_id;
 157                                 $session->status(
 158                                         OpenSRF::DomainObject::oilsMethodException->new(
 159                                                         statusCode      => STATUS_INTERNALSERVERERROR(),
 160                                                         status          => " *** Call to [$method_name] failed for session ".
 161                                                                            "[$sess_id], thread trace ".
 162                                                                            "[".$appreq->threadTrace."]:\n$e\n"
 163                                         )
 164                                 );
 165                         };
 166
 167
 168
 169                         # ----------------------------------------------
 170
 171
 172                         # XXX may need this later
 173                         # $_->[1] = 1 for (@OpenSRF::AppSession::_CLIENT_CACHE);
 174
 175                         $in_request--;
 176
 177                         $log->debug( "Pending Requests: " . scalar(@pending_requests), INTERNAL );
 178
 179                         # cycle through queued requests
 180                         while( my $aref = shift @pending_requests ) {
 181                                 $in_request++;
 182                                 my $resp;
 183                                 try {
 184                                         my $start = time;
 185                                         my $response = $aref->[2]->run( $aref->[0], @{$aref->[1]} );
 186                                         my $time = sprintf '%.3f', time - $start;
 187                                         $log->debug( "Method duration for {[".$aref->[2]->api_name." -> ".join(', ',@{$aref->[1]}).'}:  '.$time, DEBUG );
 188
 189                                         $appreq = $aref->[0];
 190                                         if( ref( $response ) ) {
 191                                                 $appreq->respond_complete( $response );
 192                                         } else {
 193                                                 $appreq->status( OpenSRF::DomainObject::oilsConnectStatus->new(
 194                                                                         statusCode => STATUS_COMPLETE(),
 195                                                                         status => 'Request Complete' ) );
 196                                         }
 197                                         $log->debug( "Executed: " . $appreq->threadTrace, DEBUG );
 198                                 } catch Error with {
 199                                         my $e = shift;
 200                                         if(UNIVERSAL::isa($e,"Error")) {
 201                                                 $e = $e->stringify();
 202                                         }
 203                                         $session->status(
 204                                                 OpenSRF::DomainObject::oilsMethodException->new(
 205                                                                 statusCode => STATUS_INTERNALSERVERERROR(),
 206                                                                 status => "Call to [".$aref->[2]->api_name."] faild:  $e"
 207                                                 )
 208                                         );
 209                                 };
 210                                 $in_request--;
 211                         }
 212
 213                         return 1;
 214                 }
 215
 216                 my $res = OpenSRF::DomainObject::oilsMethodException->new(
 217                                 status => "Received non-REQUEST message in Application handler");
 218                 $session->send('ERROR', $res);
 219                 $session->kill_me;
 220                 return 1;
 221
 222         } else {
 223                 $session->push_queue([ $app_msg, $session->last_threadTrace ]);
 224         }
 225
 226         $session->last_message_type('');
 227         $session->last_message_api_level('');
 228
 229         return 1;
 230 }
 231
 232 sub is_registered {
 233         my $self = shift;
 234         my $api_name = shift;
 235         my $api_level = shift || 1;
 236         return exists($_METHODS[$api_level]{$api_name});
 237 }
 238
 239 sub register_method {
 240         my $self = shift;
 241         my $app = ref($self) || $self;
 242         my %args = @_;
 243
 244
 245         throw OpenSRF::DomainObject::oilsMethodException unless ($args{method});
 246
 247         $args{api_level} = 1 unless(defined($args{api_level}));
 248         $args{stream} ||= 0;
 249         $args{remote} ||= 0;
 250         $args{package} ||= $app;
 251         $args{server_class} = server_class();
 252         $args{api_name} ||= $args{server_class} . '.' . $args{method};
 253
 254         unless ($args{object_hint}) {
 255                 ($args{object_hint} = $args{package}) =~ s/::/_/go;
 256         }
 257
 258         JSON->register_class_hint( name => $args{package}, hint => $args{object_hint}, type => "hash" );
 259
 260         $_METHODS[$args{api_level}]{$args{api_name}} = bless \%args => $app;
 261
 262         __PACKAGE__->register_method(
 263                 stream => 0,
 264                 api_name => $args{api_name}.'.atomic',
 265                 method => 'make_stream_atomic'
 266         ) if ($args{stream});
 267 }
 268
 269 sub retrieve_remote_apis {
 270         my $method = shift;
 271         my $session = OpenSRF::AppSession->create('router');
 272         try {
 273                 $session->connect or OpenSRF::EX::WARN->throw("Connection to router timed out");
 274         } catch Error with {
 275                 my $e = shift;
 276                 $log->debug( "Remote subrequest returned an error:\n". $e );
 277                 return undef;
 278         } finally {
 279                 return undef unless ($session->state == $session->CONNECTED);
 280         };
 281
 282         my $req = $session->request( 'opensrf.router.info.class.list' );
 283         my $list = $req->recv;
 284
 285         if( UNIVERSAL::isa($list,"Error") ) {
 286                 throw $list;
 287         }
 288
 289         my $content = $list->content;
 290
 291         $req->finish;
 292         $session->finish;
 293         $session->disconnect;
 294
 295         my %u_list = map { ($_ => 1) } @$content;
 296
 297         for my $class ( keys %u_list ) {
 298                 next if($class eq $server_class);
 299                 populate_remote_method_cache($class, $method);
 300         }
 301 }
 302
 303 sub populate_remote_method_cache {
 304         my $class = shift;
 305         my $meth = shift;
 306
 307         my $session = OpenSRF::AppSession->create($class);
 308         try {
 309                 $session->connect or OpenSRF::EX::WARN->throw("Connection to $class timed out");
 310
 311                 my $call = 'opensrf.system.method.all' unless (defined $meth);
 312                 $call = 'opensrf.system.method' if (defined $meth);
 313
 314                 my $req = $session->request( $call, $meth );
 315
 316                 while (my $method = $req->recv) {
 317                         next if (UNIVERSAL::isa($method, 'Error'));
 318
 319                         $method = $method->content;
 320                         next if ( exists($_METHODS[$$method{api_level}]) &&
 321                                 exists($_METHODS[$$method{api_level}]{$$method{api_name}}) );
 322                         $method->{remote} = 1;
 323                         bless($method, __PACKAGE__ );
 324                         $_METHODS[$$method{api_level}]{$$method{api_name}} = $method;
 325                 }
 326
 327                 $req->finish;
 328                 $session->finish;
 329                 $session->disconnect;
 330
 331         } catch Error with {
 332                 my $e = shift;
 333                 $log->debug( "Remote subrequest returned an error:\n". $e );
 334                 return undef;
 335         };
 336 }
 337
 338 sub method_lookup {
 339         my $self = shift;
 340         my $method = shift;
 341         my $proto = shift;
 342         my $no_recurse = shift || 0;
 343         my $no_remote = shift || 0;
 344
 345         # this instead of " || 1;" above to allow api_level 0
 346         $proto = $self->api_level unless (defined $proto);
 347
 348         my $class = ref($self) || $self;
 349
 350         $log->debug("Lookup of [$method] by [$class] in api_level [$proto]", DEBUG);
 351         $log->debug("Available methods\n\t".join("\n\t", keys %{ $_METHODS[$proto] }), INTERNAL);
 352
 353         my $meth;
 354         if (__PACKAGE__->thunk) {
 355                 for my $p ( reverse(1 .. $proto) ) {
 356                         if (exists $_METHODS[$p]{$method}) {
 357                                 $meth = $_METHODS[$p]{$method};
 358                         }
 359                 }
 360         } else {
 361                 if (exists $_METHODS[$proto]{$method}) {
 362                         $meth = $_METHODS[$proto]{$method};
 363                 }
 364         }
 365
 366         if (defined $meth) {
 367                 $log->debug("Looks like we found [$method]!", DEBUG);
 368                 $log->debug("Method object is ".Dumper($meth), INTERNAL);
 369                 if($no_remote and $meth->{remote}) {
 370                         $log->debug("OH CRAP We're not supposed to return remote methods", WARN);
 371                         return undef;
 372                 }
 373
 374         } elsif (!$no_recurse) {
 375                 $log->debug("We didn't find [$method], asking everyone else.", DEBUG);
 376                 retrieve_remote_apis($method);
 377                 $meth = $self->method_lookup($method,$proto,1);
 378         }
 379
 380         return $meth;
 381 }
 382
 383 sub run {
 384         my $self = shift;
 385         my $req = shift;
 386
 387         my $resp;
 388         my @params = @_;
 389
 390         if ( !UNIVERSAL::isa($req, 'OpenSRF::AppRequest') ) {
 391                 $log->debug("Creating a SubRequest object", DEBUG);
 392                 unshift @params, $req;
 393                 $req = OpenSRF::AppSubrequest->new;
 394         } else {
 395                 $log->debug("This is a top level request", DEBUG);
 396         }
 397
 398         if (!$self->{remote}) {
 399                 my $code ||= \&{$self->{package} . '::' . $self->{method}};
 400                 $log->debug("Created coderef [$code] for $$self{package}::$$self{method}",DEBUG);
 401                 my $err = undef;
 402
 403                 try {
 404                         $resp = $code->($self, $req, @params);
 405
 406                 } catch Error with {
 407                         my $e = shift;
 408                         $err = $e;
 409                         warn "Method 'run' catching error: $e\n";
 410
 411                         if( ref($self) eq 'HASH') {
 412                                 $log->error("Sub $$self{package}::$$self{method} DIED!!!\n\t$e\n", ERROR);
 413                         }
 414                 };
 415
 416                 if($err) {
 417                         if(UNIVERSAL::isa($err,"Error")) {
 418                                 warn "Throwing from method run:\n$err\n------------------\n";
 419                                 throw $err;
 420                         } else {
 421                                 die $err->stringify;
 422                         }
 423                 }
 424
 425
 426                 $log->debug("Coderef for [$$self{package}::$$self{method}] has been run", DEBUG);
 427
 428                 if ( ref($req) and UNIVERSAL::isa($req, 'OpenSRF::AppSubrequest') ) {
 429                         $log->debug("A SubRequest object is responding", DEBUG);
 430                         $req->respond($resp) if (defined $resp);
 431                         $log->debug("... Responding with : " . join(" ",$req->responses), DEBUG);
 432                         return $req->responses;
 433                 } else {
 434                         $log->debug("A top level Request object is responding $resp", DEBUG) if (defined $resp);
 435                         return $resp;
 436                 }
 437         } else {
 438                 my $session = OpenSRF::AppSession->create($self->{server_class});
 439                 try {
 440                         #$session->connect or OpenSRF::EX::WARN->throw("Connection to [$$self{server_class}] timed out");
 441                         my $remote_req = $session->request( $self->{api_name}, @params );
 442                         while (my $remote_resp = $remote_req->recv) {
 443                                 OpenSRF::Utils::Logger->debug("Remote Subrequest Received " . $remote_resp, INTERNAL );
 444                                 if( UNIVERSAL::isa($remote_resp,"Error") ) {
 445                                         throw $remote_resp;
 446                                 }
 447                                 $req->respond( $remote_resp->content );
 448                         }
 449                         $remote_req->finish();
 450
 451                 } catch Error with {
 452                         my $e = shift;
 453                         $log->debug( "Remote subrequest returned an error:\n". $e );
 454                         return undef;
 455                 };
 456
 457                 if ($session) {
 458                         $session->disconnect();
 459                         $session->finish();
 460                 }
 461
 462                 $log->debug( "Remote Subrequest Responses " . join(" ", $req->responses), INTERNAL );
 463
 464                 return $req->responses;
 465         }
 466         # huh? how'd we get here...
 467         return undef;
 468 }
 469
 470 sub introspect {
 471         my $self = shift;
 472         my $client = shift;
 473         my $method = shift;
 474
 475         $method = undef if ($self->api_name =~ /all$/o);
 476
 477         for my $api_level ( reverse(1 .. $#_METHODS) ) {
 478                 for my $api_name ( sort keys %{$_METHODS[$api_level]} ) {
 479                         if (!$_METHODS[$api_level]{$api_name}{remote}) {
 480                                 if (defined($method)) {
 481                                         if ($api_name =~ $method) {
 482                                                 $client->respond( $_METHODS[$api_level]{$api_name} );
 483                                         }
 484                                 } else {
 485                                         $log->debug( "Returning definition for method [$api_name]", INTERNAL );
 486                                         $client->respond( $_METHODS[$api_level]{$api_name} );
 487                                         $log->debug( "responed with definition for method [$api_name]", INTERNAL );
 488                                 }
 489                         }
 490                 }
 491         }
 492
 493         return undef;
 494 }
 495 __PACKAGE__->register_method(
 496         stream => 1,
 497         method => 'introspect',
 498         api_name => 'opensrf.system.method.all'
 499 );
 500 __PACKAGE__->register_method(
 501         stream => 1,
 502         method => 'introspect',
 503         argc => 1,
 504         api_name => 'opensrf.system.method'
 505 );
 506
 507 sub echo_method {
 508         my $self = shift;
 509         my $client = shift;
 510         my @args = @_;
 511
 512         $client->respond( $_ ) for (@args);
 513         return undef;
 514 }
 515 __PACKAGE__->register_method(
 516         stream => 1,
 517         method => 'echo_method',
 518         argc => 1,
 519         api_name => 'opensrf.system.echo'
 520 );
 521
 522 sub make_stream_atomic {
 523         my $self = shift;
 524         my $req = shift;
 525         my @args = @_;
 526
 527         (my $m_name = $self->api_name) =~ s/\.atomic$//o;
 528         my @results = $self->method_lookup($m_name)->run(@args);
 529
 530         return \@results;
 531 }
 532
 533
 534 1;