From 9fe1f6870cfd12c34eb4efef8f4e199e8324c1af Mon Sep 17 00:00:00 2001
From: Christoph Helma <helma@in-silico.ch>
Date: Sun, 19 Feb 2012 16:03:10 +0000
Subject: task handling fixed for http codes > 202

---
 lib/task.rb | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 58 insertions(+), 10 deletions(-)

(limited to 'lib/task.rb')

diff --git a/lib/task.rb b/lib/task.rb
index 50616d7..52d4a30 100644
--- a/lib/task.rb
+++ b/lib/task.rb
@@ -1,28 +1,47 @@
-require File.join(File.dirname(__FILE__),'spork')
+require File.join(File.dirname(__FILE__),'error')
 DEFAULT_TASK_MAX_DURATION = 36000
 module OpenTox
 
   # Class for handling asynchronous tasks
   class Task
 
+    attr_accessor :pid
     def self.create service_uri, params={}
       task = Task.new RestClient.post(service_uri,params).chomp
-      pid = Spork.spork do
+      pid = fork do
         begin
-          task.completed yield 
-        rescue => error
-          task.error error
+          result_uri = yield 
+          if result_uri.uri?
+            task.completed result_uri
+          else
+            raise "#{result_uri} is not a valid URI"
+          end
+        rescue 
+          # TODO add service URI to Kernel.raise
+          # serialize error and send to task service
+          #task.error $!
+          task.error $! 
+          raise
         end
       end
+      Process.detach(pid)
       task.pid = pid
       task
     end
 
+    def kill
+      begin
+        Process.kill(9,pid)
+      rescue 
+      end
+    end
+
     def description
       metadata[RDF::DC.description]
     end
     
     def cancel
+      kill
       RestClient.put(File.join(@uri,'Cancelled'),{})
     end
 
@@ -30,19 +49,24 @@ module OpenTox
       RestClient.put(File.join(@uri,'Completed'),{:resultURI => uri})
     end
 
-    def error(error)
-      RestClient.put(File.join(@uri,'Error'),{:errorReport => OpenTox::Error.new(error)})
+    def error error
+      $logger.error self if $logger
+      kill
+      report = ErrorReport.create(error,"http://localhost")
+      RestClient.put(File.join(@uri,'Error'),{:errorReport => report})
+      #RestClient.put(File.join(@uri,'Error'),{:message => error, :backtrace => error.backtrace})
     end
 
     # waits for a task, unless time exceeds or state is no longer running
-    # @param [optional,Numeric] dur seconds pausing before cheking again for completion
+    # @param [optional,Numeric] dur seconds pausing before checking again for completion
     def wait_for_completion(dur=0.3)
       due_to_time = Time.new + DEFAULT_TASK_MAX_DURATION
-      while self.running?
+      while running?
         sleep dur
         raise "max wait time exceeded ("+DEFAULT_TASK_MAX_DURATION.to_s+"sec), task: '"+@uri.to_s+"'" if (Time.new > due_to_time)
       end
     end
+
   end
 
   def method_missing(method,*args)
@@ -55,13 +79,37 @@ module OpenTox
       when /\?/
         return hasStatus == method.sub(/\?/,'').capitalize
       else
-        return metadata[RDF::OT[method]].to_s
+        response = metadata[RDF::OT[method]].to_s
+        response = metadata[RDF::OT1[method]].to_s #if response.empty?  # API 1.1 compatibility
+        if response.empty?
+          $logger.error "No #{method} metadata for #{@uri} "
+          raise "No #{method} metadata for #{@uri} "
+        end
+        return response
       end
     rescue
+      $logger.error "Unknown #{self.class} method #{method}"
       super
     end
   end
 
+  # override to read all error codes
+  def metadata reload=true
+    if reload
+      @metadata = {}
+      # ignore error codes from Task services (may contain eg 500 which causes exceptions in RestClient and RDF::Reader
+      RestClient.get(@uri) do |response, request, result, &block|
+        $logger.warn "#{@uri} returned #{result}" unless response.code == 200 or response.code == 202
+        RDF::Reader.for(:rdfxml).new(response) do |reader|
+          reader.each_statement do |statement|
+            @metadata[statement.predicate] = statement.object if statement.subject == @uri
+          end
+        end
+      end
+    end
+    @metadata
+  end
+
   #TODO: subtasks
 
 end
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