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$self_task=nil
module OpenTox
# Class for handling asynchronous tasks
class Task
include OpenTox
attr_accessor :http_code, :due_to_time
def initialize(uri=nil)
super uri
@metadata = {
DC.title => "",
DC.date => "",
OT.hasStatus => "Running",
OT.percentageCompleted => "0",
OT.resultURI => "",
DC.creator => "", # not mandatory according to API
DC.description => "", # not mandatory according to API
}
end
# Create a new task for the code in the block. Catches halts and exceptions and sets task state to error if necessary. The block has to return the URI of the created resource.
# @example
# task = OpenTox::Task.create do
# # this code will be executed as a task
# model = OpenTox::Algorithm.run(params) # this can be time consuming
# model.uri # Important: return URI of the created resource
# end
# task.status # returns "Running", because tasks are forked
# @param [String] title Task title
# @param [String] creator Task creator
# @return [OPenTox::Task] Task
def self.create( title=nil, creator=nil, max_duration=DEFAULT_TASK_MAX_DURATION, description=nil )
params = {:title=>title, :creator=>creator, :max_duration=>max_duration, :description=>description }
task_uri = RestClientWrapper.post(CONFIG[:services]["opentox-task"], params, nil, false).to_s
task = Task.new(task_uri.chomp)
# measure current memory consumption
memory = `free -m|sed -n '2p'`.split
free_memory = memory[3].to_i + memory[6].to_i # include cache
if free_memory < 20 # require at least 200 M free memory
LOGGER.warn "Cannot start task - not enough memory left (#{free_memory} M free)"
task.cancel
return task
#raise "Insufficient memory to start a new task"
end
cpu_load = `cat /proc/loadavg`.split(/\s+/)[0..2].collect{|c| c.to_f}
nr_cpu_cores = `cat /proc/cpuinfo |grep "cpu cores"|cut -d ":" -f2|tr -d " "`.split("\n").collect{|c| c.to_i}.inject{|sum,n| sum+n}
nr_cpu_cores = 1 if !nr_cpu_cores
if cpu_load[0] > nr_cpu_cores and cpu_load[0] > cpu_load[1] and cpu_load[1] > cpu_load[2] # average CPU load of the last minute is high and CPU load is increasing
LOGGER.warn "Cannot start task - CPU load too high (#{cpu_load.join(", ")})"
task.cancel
return task
#raise "Server too busy to start a new task"
end
task_pid = Spork.spork(:logger => LOGGER) do
LOGGER.debug "Task #{task.uri} started #{Time.now}"
$self_task = task
begin
result = catch(:halt) do
yield task
end
# catching halt, set task state to error
if result && result.is_a?(Array) && result.size==2 && result[0]>202
LOGGER.error "task was halted: "+result.inspect
task.error(result[1])
return
end
LOGGER.debug "Task #{task.uri} done #{Time.now} -> "+result.to_s
task.completed(result)
rescue => ex
LOGGER.error "task failed: "+ex.message
LOGGER.error ": "+ex.backtrace.join("\n")
task.error(ex.message)
end
end
task.pid = task_pid
LOGGER.debug "Started task: "+task.uri.to_s
task
end
# Find a task for querying, status changes
# @param [String] uri Task URI
# @return [OpenTox::Task] Task object
def self.find(uri)
task = Task.new(uri)
task.load_metadata
task
end
# Get a list of all tasks
# @param [optional, String] uri URI of task service
# @return [text/uri-list] Task URIs
def self.all(uri=CONFIG[:services]["opentox-task"])
OpenTox.all uri
end
def self.from_yaml(yaml)
@metadata = YAML.load(yaml)
end
def self.from_rdfxml(rdfxml)
file = Tempfile.open("ot-rdfxml"){|f| f.write(rdfxml)}.path
parser = Parser::Owl::Generic.new file
@metadata = parser.load_metadata
end
def to_rdfxml
s = Serializer::Owl.new
s.add_task(@uri,@metadata)
s.to_rdfxml
end
def status
@metadata[OT.hasStatus]
end
def result_uri
@metadata[OT.resultURI]
end
def description
@metadata[DC.description]
end
def cancel
RestClientWrapper.put(File.join(@uri,'Cancelled'))
load_metadata
end
def completed(uri)
RestClientWrapper.put(File.join(@uri,'Completed'),{:resultURI => uri})
load_metadata
end
def error(description)
RestClientWrapper.put(File.join(@uri,'Error'),{:description => description.to_s[0..2000]})
load_metadata
end
def pid=(pid)
RestClientWrapper.put(File.join(@uri,'pid'), {:pid => pid})
end
def running?
@metadata[OT.hasStatus] == 'Running'
end
def completed?
@metadata[OT.hasStatus] == 'Completed'
end
def error?
@metadata[OT.hasStatus] == 'Error'
end
def load_metadata
if (CONFIG[:yaml_hosts].include?(URI.parse(uri).host))
result = RestClientWrapper.get(@uri, {:accept => 'application/x-yaml'}, false)
@metadata = YAML.load result.to_s
@http_code = result.code
else
@metadata = Parser::Owl::Generic.new(@uri).load_metadata
@http_code = RestClientWrapper.get(uri, {:accept => 'application/rdf+xml'}, false).code
end
end
# create is private now, use OpenTox::Task.as_task
#def self.create( params )
#task_uri = RestClientWrapper.post(CONFIG[:services]["opentox-task"], params, nil, false).to_s
#Task.find(task_uri.chomp)
#end
=begin
def self.from_data(data, content_type, code, base_uri)
task = Task.new(nil)
task.http_code = code
task.reload_from_data(data, content_type, base_uri)
return task
end
def reload( accept_header=nil )
unless accept_header
if (CONFIG[:yaml_hosts].include?(URI.parse(uri).host))
accept_header = "application/x-yaml"
else
accept_header = 'application/rdf+xml'
end
end
result = RestClientWrapper.get(uri, {:accept => accept_header}, false)#'application/x-yaml'})
@http_code = result.code
reload_from_data(result, result.content_type, uri)
end
def reload_from_data( data, content_type, base_uri )
case content_type
when /yaml/
task = YAML.load data
TASK_ATTRIBS.each do |a|
raise "task yaml data invalid, key missing: "+a.to_s unless task.has_key?(a)
send("#{a.to_s}=".to_sym,task[a])
end
when /application\/rdf\+xml/
owl = OpenTox::Owl.from_data(data,base_uri,"Task")
self.uri = owl.uri
(TASK_ATTRIBS-[:uri]).each{|a| self.send("#{a.to_s}=".to_sym, owl.get(a.to_s))}
else
raise "content type for tasks not supported: "+content_type.to_s
end
raise "uri is null after loading" unless @uri and @uri.to_s.strip.size>0
end
=end
# waits for a task, unless time exceeds or state is no longer running
def wait_for_completion(dur=0.3)
due_to_time = Time.new + DEFAULT_TASK_MAX_DURATION
LOGGER.debug "start waiting for task "+@uri.to_s+" at: "+Time.new.to_s+", waiting at least until "+due_to_time.to_s
load_metadata # for extremely fast tasks
check_state
while self.running?
sleep dur
load_metadata
check_state
if (Time.new > due_to_time)
raise "max wait time exceeded ("+DEFAULT_TASK_MAX_DURATION.to_s+"sec), task: '"+@uri.to_s+"'"
end
end
LOGGER.debug "Task '"+@metadata[OT.hasStatus]+"': "+@uri.to_s+", Result: "+@metadata[OT.resultURI].to_s
end
private
def check_state
begin
raise "illegal task state, task is completed, resultURI is no URI: '"+@metadata[OT.resultURI].to_s+
"'" unless @metadata[OT.resultURI] and @metadata[OT.resultURI].to_s.uri? if completed?
if @http_code == 202
raise "#{@uri}: illegal task state, code is 202, but hasStatus is not Running: '"+@metadata[OT.hasStatus]+"'" unless running?
elsif @http_code == 201
raise "#{@uri}: illegal task state, code is 201, but hasStatus is not Completed: '"+@metadata[OT.hasStatus]+"'" unless completed?
raise "#{@uri}: illegal task state, code is 201, resultURI is no task-URI: '"+@metadata[OT.resultURI].to_s+
"'" unless @metadata[OT.resultURI] and @metadata[OT.resultURI].to_s.uri?
end
rescue => ex
RestClientWrapper.raise_uri_error(ex.message, @uri)
end
end
end
end
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