445 lines
12 KiB
Perl
445 lines
12 KiB
Perl
package Spectre::Workflow;
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=head1 LEGAL
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-------------------------------------------------------------------
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WebGUI is Copyright 2001-2006 Plain Black Corporation.
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-------------------------------------------------------------------
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Please read the legal notices (docs/legal.txt) and the license
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(docs/license.txt) that came with this distribution before using
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this software.
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-------------------------------------------------------------------
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http://www.plainblack.com info@plainblack.com
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-------------------------------------------------------------------
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=cut
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use strict;
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use HTTP::Request::Common;
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use HTTP::Cookies;
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use POE qw(Component::Client::HTTP);
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use POE::Queue::Array;
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#-------------------------------------------------------------------
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=head2 _start ( )
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Initializes the workflow manager.
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=cut
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sub _start {
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my ( $kernel, $self, $publicEvents) = @_[ KERNEL, OBJECT, ARG0 ];
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$self->debug("Starting workflow manager.");
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my $serviceName = "workflow";
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$kernel->alias_set($serviceName);
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$kernel->call( IKC => publish => $serviceName, $publicEvents );
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$kernel->yield("checkInstances");
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}
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#-------------------------------------------------------------------
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=head2 _stop ( )
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Gracefully shuts down the workflow manager.
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=cut
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sub _stop {
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my ($kernel, $self) = @_[KERNEL, OBJECT];
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$self->debug("Stopping workflow manager.");
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undef $self;
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}
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#-------------------------------------------------------------------
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=head2 addInstance ( params )
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Adds a workflow instance to the workflow processing queue.
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=head3 params
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A hash reference containing important information about the workflow instance to add to the queue.
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=head4 sitename
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The host and domain of the site this instance belongs to.
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=head4 instanceId
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The unqiue id for this workflow instance.
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=head4 priority
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The priority (1,2, or 3) that this instance should be run at.
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=cut
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sub addInstance {
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my ($self, $instance) = @_[OBJECT, ARG0];
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my $priority = ($instance->{priority} -1) * 10;
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$self->debug("Adding workflow instance ".$instance->{instanceId}." from ".$instance->{sitename}." to queue at priority ".$priority.".");
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$self->getWaitingQueue->enqueue($priority, $instance);
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}
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#-------------------------------------------------------------------
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=head2 checkInstances ( )
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Checks to see if there are any open instance slots available, and if there are assigns a new instance to be run to fill it.
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=cut
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sub checkInstances {
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my ($kernel, $self) = @_[KERNEL, OBJECT];
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$self->debug("Checking to see if we can run anymore instances right now.");
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if ($self->countRunningInstances < $self->config->get("maxWorkers")) {
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$self->debug("Total workflows waiting to run: ".$self->getWaitingQueue->get_item_count);
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my $instance = $self->getNextInstance;
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if (defined $instance) {
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$kernel->yield("runWorker",$instance);
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}
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}
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$kernel->delay_set("checkInstances",$self->config->get("timeBetweenRunningWorkflows"));
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}
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#-------------------------------------------------------------------
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=head2 config ( )
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Returns a reference to the config object.
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=cut
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sub config {
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my $self = shift;
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return $self->{_config};
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}
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#-------------------------------------------------------------------
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=head2 countRunningInstances ( )
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Returns an integer representing the number of running instances.
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=cut
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sub countRunningInstances {
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my $self = shift;
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my $instanceCount = $self->getRunningQueue->get_item_count;
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$self->debug("There are $instanceCount running instances.");
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return $instanceCount;
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}
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#-------------------------------------------------------------------
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=head2 debug ( output )
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Prints out debug information if debug is enabled.
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=head3 output
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The debug message to be printed if debug is enabled.
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=cut
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sub debug {
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my $self = shift;
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my $output = shift;
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if ($self->{_debug}) {
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print "WORKFLOW: ".$output."\n";
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}
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$self->getLogger->debug("WORKFLOW: ".$output);
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}
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#-------------------------------------------------------------------
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=head2 deleteInstance ( instanceId )
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Removes a workflow instance from the processing queue.
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=cut
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sub deleteInstance {
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my ($self, $instanceId,$kernel, $session ) = @_[OBJECT, ARG0, KERNEL, SESSION];
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$self->debug("Deleting workflow instance $instanceId from queue.");
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$self->getWaitingQueue->remove_items(
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sub {
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my $instance = shift;
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return 1 if ($instance->{instanceId} eq $instanceId);
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return 0;
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}
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);
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$self->removeInstanceFromRunningQueue($instanceId);
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}
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#-------------------------------------------------------------------
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=head2 error ( output )
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Prints out error information if debug is enabled.
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=head3 output
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The error message to be printed if debug is enabled.
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=cut
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sub error {
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my $self = shift;
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my $output = shift;
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if ($self->{_debug}) {
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print "WORKFLOW: [Error] ".$output."\n";
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}
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$self->getLogger->error("WORKFLOW: ".$output);
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}
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#-------------------------------------------------------------------
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=head2 getLogger ( )
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Returns a reference to the logger.
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=cut
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sub getLogger {
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my $self = shift;
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return $self->{_logger};
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}
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#-------------------------------------------------------------------
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=head2 getNextInstance ( )
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Returns the next available instance.
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=cut
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sub getNextInstance {
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my $self = shift;
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$self->debug("Looking for a workflow instance to run.");
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my $waiting = $self->getWaitingQueue;
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if ($waiting->get_item_count > 0) {
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my ($priority, $id, $instance) = $waiting->dequeue_next;
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$instance->{workingPriority} = $priority;
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$self->getRunningQueue->enqueue($priority, $instance);
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$self->debug("Looks like ".$instance->{instanceId}." at priority $priority would be a good workflow instance to run.");
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return $instance;
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}
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$self->debug("Didn't see any workflow instances to run.");
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return undef;
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}
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#-------------------------------------------------------------------
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=head2 getRunningQueue ( )
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Returns a reference to the queue of workflow instances that are running now.
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=cut
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sub getRunningQueue {
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my $self = shift;
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return $self->{_runningQueue};
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}
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#-------------------------------------------------------------------
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=head2 getStatus ( )
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Returns a formatted text status report about the workflow engine.
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=cut
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sub getStatus {
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my ($kernel, $request, $self) = @_[KERNEL,ARG0,OBJECT];
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my $output = "Running Workflows: ".$self->getRunningQueue->get_item_count."\n";
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$output .= "Workflows Waiting To Run: ".$self->getWaitingQueue->get_item_count."\n";
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my ($data, $rsvp) = @$request;
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$kernel->call(IKC=>post=>$rsvp,$output);
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}
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#-------------------------------------------------------------------
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=head2 getWaitingQueue ( )
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Returns a reference to the queue of workflow instances waiting to run.
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=cut
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sub getWaitingQueue {
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my $self = shift;
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return $self->{_waitingQueue};
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}
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#-------------------------------------------------------------------
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=head2 new ( config, logger, [ , debug ] )
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Constructor. Loads all active workflows from each WebGUI site and begins executing them.
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=head3 config
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The config object for spectre.
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=head3 logger
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A reference to the logger object.
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=head3 debug
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A boolean indicating Spectre should spew forth debug as it runs.
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=cut
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sub new {
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my $class = shift;
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my $config = shift;
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my $logger = shift;
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my $debug = shift;
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my $self = {_debug=>$debug, _config=>$config, _logger=>$logger};
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bless $self, $class;
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my @publicEvents = qw(addInstance deleteInstance getStatus);
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POE::Session->create(
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object_states => [ $self => [qw(_start _stop returnInstanceToRunnableState addInstance checkInstances deleteInstance suspendInstance runWorker workerResponse), @publicEvents] ],
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args=>[\@publicEvents]
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);
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my $cookies = HTTP::Cookies->new(file => '/tmp/cookies');
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POE::Component::Client::HTTP->spawn(
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Agent => 'Spectre',
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Alias => 'workflow-ua',
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CookieJar => $cookies
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);
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$self->{_runningQueue} = POE::Queue::Array->new;
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$self->{_waitingQueue} = POE::Queue::Array->new;
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}
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#-------------------------------------------------------------------
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=head2 removeInstanceFromRunningQueue ( )
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Removes a workflow instance from the queue that tracks what's running and returns a reference to it.
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=cut
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sub removeInstanceFromRunningQueue {
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my $self = shift;
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my $instanceId = shift;
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my @items = $self->getRunningQueue->remove_items(
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sub {
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my $payload = shift;
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return 1 if ($payload->{instanceId} eq $instanceId);
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return 0;
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}
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);
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my $instance = $items[0][2];
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return $instance;
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}
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#-------------------------------------------------------------------
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=head2 returnInstanceToRunnableState ( )
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Returns a workflow instance back to runnable queue.
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=cut
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sub returnInstanceToRunnableState {
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my ($self, $instance) = @_[OBJECT, ARG0];
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$self->debug("Returning ".$instance->{instanceId}." to runnable state.");
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$self->getWaitingQueue->enqueue($instance->{workingPriority}+1, $instance);
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}
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#-------------------------------------------------------------------
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=head2 runWorker ( )
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Calls a worker to execute a workflow activity.
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=cut
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sub runWorker {
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my ($kernel, $self, $instance, $session) = @_[KERNEL, OBJECT, ARG0, SESSION];
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$self->debug("Preparing to run workflow instance ".$instance->{instanceId}.".");
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my $url = "http://".$instance->{sitename}.':'.$self->config->get("webguiPort").$instance->{gateway};
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my $request = POST $url, [op=>"runWorkflow", instanceId=>$instance->{instanceId}];
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my $cookie = $self->{_cookies}{$instance->{sitename}};
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$request->header("Cookie",$instance->{cookieName}."=".$cookie) if (defined $cookie);
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$request->header("X-instanceId",$instance->{instanceId});
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$request->header("User-Agent","Spectre");
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$self->debug("Posting workflow instance ".$instance->{instanceId}." to $url.");
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$kernel->post('workflow-ua','request', 'workerResponse', $request);
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$self->debug("Workflow instance ".$instance->{instanceId}." posted.");
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}
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#-------------------------------------------------------------------
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=head2 suspendInstance ( )
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Suspends a workflow instance for a number of seconds defined in the config file, and then returns it to the runnable queue.
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=cut
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sub suspendInstance {
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my ($self, $instance, $kernel) = @_[OBJECT, ARG0, KERNEL];
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$self->debug("Suspending workflow instance ".$instance->{instanceId}." for ".$self->config->get("suspensionDelay")." seconds.");
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$kernel->delay_set("returnInstanceToRunnableState",$self->config->get("suspensionDelay"), $instance);
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}
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#-------------------------------------------------------------------
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=head2 workerResponse ( )
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This method is called when the response from the runWorker() method is received.
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=cut
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sub workerResponse {
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my ($self, $kernel, $requestPacket, $responsePacket) = @_[OBJECT, KERNEL, ARG0, ARG1];
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$self->debug("Retrieving response from workflow instance.");
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my $request = $requestPacket->[0];
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my $response = $responsePacket->[0];
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my $instanceId = $request->header("X-instanceId"); # got to figure out how to get this from the request, cuz the response may die
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$self->debug("Response retrieved is for $instanceId.");
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my $instance = $self->removeInstanceFromRunningQueue($instanceId);
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if ($response->is_success) {
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$self->debug("Response for $instanceId retrieved successfully.");
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if ($response->header("Set-Cookie") ne "") {
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$self->debug("Storing cookie for $instanceId for later use.");
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my $cookie = $response->header("Set-Cookie");
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my $pattern = $instance->{cookieName}."=([a-zA-Z0-9\_\-]{22}).*";
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$cookie =~ s/$pattern/$1/;
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$self->{_cookies}{$instance->{sitename}} = $cookie;
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}
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my $state = $response->content;
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if ($state eq "waiting") {
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$self->debug("Was told to wait on $instanceId because we're still waiting on some external event.");
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$kernel->yield("suspendInstance",$instance);
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} elsif ($state eq "complete") {
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$self->debug("Workflow instance $instanceId ran one of it's activities successfully.");
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$kernel->yield("returnInstanceToRunnableState",$instance);
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} elsif ($state eq "disabled") {
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$self->debug("Workflow instance $instanceId is disabled.");
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$kernel->yield("suspendInstance",$instance);
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} elsif ($state eq "done") {
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$self->debug("Workflow instance $instanceId is now complete.");
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$kernel->yield("deleteInstance",$instanceId);
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} elsif ($state eq "error") {
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$self->debug("Got an error response for $instanceId.");
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$kernel->yield("suspendInstance",$instance);
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} else {
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$self->error("Something bad happened on the return of $instanceId. ".$response->error_as_HTML);
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$kernel->yield("suspendInstance",$instance);
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}
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} elsif ($response->is_redirect) {
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$self->error("Response for $instanceId was redirected. This should never happen if configured properly!!!");
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} elsif ($response->is_error) {
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$self->error("Response for $instanceId had a communications error. ".$response->error_as_HTML);
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$kernel->yield("suspendInstance",$instance)
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}
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}
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1;
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