services/api/app/controllers/arvados/v1/jobs_controller.rb

   1 class Arvados::V1::JobsController < ApplicationController
   2   accept_attribute_as_json :script_parameters, Hash
   3   accept_attribute_as_json :runtime_constraints, Hash
   4   accept_attribute_as_json :tasks_summary, Hash
   5   skip_before_filter :find_object_by_uuid, :only => :queue
   6   skip_before_filter :render_404_if_no_object, :only => :queue
   7
   8   def index
   9     want_ancestor = @where[:script_version_descends_from]
  10     if want_ancestor
  11       # Check for missing commit_ancestor rows, and create them if
  12       # possible.
  13       @objects.
  14         dup.
  15         includes(:commit_ancestors). # I wish Rails would let me
  16                                      # specify here which
  17                                      # commit_ancestors I am
  18                                      # interested in.
  19         each do |o|
  20         if o.commit_ancestors.
  21             select { |ca| ca.ancestor == want_ancestor }.
  22             empty? and !o.script_version.nil?
  23           begin
  24             o.commit_ancestors << CommitAncestor.find_or_create_by_descendant_and_ancestor(o.script_version, want_ancestor)
  25           rescue
  26           end
  27         end
  28         o.commit_ancestors.
  29           select { |ca| ca.ancestor == want_ancestor }.
  30           select(&:is).
  31           first
  32       end
  33       # Now it is safe to do an .includes().where() because we are no
  34       # longer interested in jobs that have other ancestors but not
  35       # want_ancestor.
  36       @objects = @objects.
  37         includes(:commit_ancestors).
  38         where('commit_ancestors.ancestor = ? and commit_ancestors.is = ?',
  39               want_ancestor, true)
  40     end
  41     super
  42   end
  43
  44   def cancel
  45     reload_object_before_update
  46     @object.update_attributes cancelled_at: Time.now
  47     show
  48   end
  49
  50   class LogStreamer
  51     Q_UPDATE_INTERVAL = 12
  52     def initialize(job, opts={})
  53       @job = job
  54       @opts = opts
  55     end
  56     def each
  57       if @job.finished_at
  58         yield "#{@job.uuid} finished at #{@job.finished_at}\n"
  59         return
  60       end
  61       while not @job.started_at
  62         # send a summary (job queue + available nodes) to the client
  63         # every few seconds while waiting for the job to start
  64         last_ack_at ||= Time.now - Q_UPDATE_INTERVAL - 1
  65         if Time.now - last_ack_at >= Q_UPDATE_INTERVAL
  66           nodes_in_state = {idle: 0, alloc: 0}
  67           ActiveRecord::Base.uncached do
  68             Node.where('hostname is not ?', nil).collect do |n|
  69               if n.info[:slurm_state]
  70                 nodes_in_state[n.info[:slurm_state]] ||= 0
  71                 nodes_in_state[n.info[:slurm_state]] += 1
  72               end
  73             end
  74           end
  75           job_queue = Job.queue
  76           n_queued_before_me = 0
  77           job_queue.each do |j|
  78             break if j.uuid == @job.uuid
  79             n_queued_before_me += 1
  80           end
  81           yield "#{Time.now}" \
  82             " job #{@job.uuid}" \
  83             " queue_position #{n_queued_before_me}" \
  84             " queue_size #{job_queue.size}" \
  85             " nodes_idle #{nodes_in_state[:idle]}" \
  86             " nodes_alloc #{nodes_in_state[:alloc]}\n"
  87           last_ack_at = Time.now
  88         end
  89         sleep 3
  90         ActiveRecord::Base.uncached do
  91           @job.reload
  92         end
  93       end
  94       @redis = Redis.new(:timeout => 0)
  95       if @redis.exists @job.uuid
  96         # A log buffer exists. Start by showing the last few KB.
  97         @redis.
  98           getrange(@job.uuid, 0 - [@opts[:buffer_size], 1].max, -1).
  99           sub(/^[^\n]*\n?/, '').
 100           split("\n").
 101           each do |line|
 102           yield "#{line}\n"
 103         end
 104       end
 105       # TODO: avoid missing log entries between getrange() above and
 106       # subscribe() below.
 107       @redis.subscribe(@job.uuid) do |event|
 108         event.message do |channel, msg|
 109           if msg == "end"
 110             @redis.unsubscribe @job.uuid
 111           else
 112             yield "#{msg}\n"
 113           end
 114         end
 115       end
 116     end
 117   end
 118
 119   def self._log_tail_follow_requires_parameters
 120     {
 121       buffer_size: {type: 'integer', required: false, default: 2**13}
 122     }
 123   end
 124   def log_tail_follow
 125     if !@object.andand.uuid
 126       return render_not_found
 127     end
 128     if client_accepts_plain_text_stream
 129       self.response.headers['Last-Modified'] = Time.now.ctime.to_s
 130       self.response_body = LogStreamer.new @object, {
 131         buffer_size: (params[:buffer_size].to_i rescue 2**13)
 132       }
 133     else
 134       render json: {
 135         href: url_for(uuid: @object.uuid),
 136         comment: ('To retrieve the log stream as plain text, ' +
 137                   'use a request header like "Accept: text/plain"')
 138       }
 139     end
 140   end
 141
 142   def queue
 143     load_where_param
 144     @where.merge!({
 145                     started_at: nil,
 146                     is_locked_by_uuid: nil,
 147                     cancelled_at: nil
 148                   })
 149     params[:order] ||= 'priority desc, created_at'
 150     find_objects_for_index
 151     index
 152   end
 153
 154   def self._queue_requires_parameters
 155     self._index_requires_parameters
 156   end
 157 end