services/api/app/models/container.rb

   1 require 'whitelist_update'
   2
   3 class Container < ArvadosModel
   4   include HasUuid
   5   include KindAndEtag
   6   include CommonApiTemplate
   7   include WhitelistUpdate
   8   extend CurrentApiClient
   9
  10   serialize :environment, Hash
  11   serialize :mounts, Hash
  12   serialize :runtime_constraints, Hash
  13   serialize :command, Array
  14   serialize :scheduling_parameters, Hash
  15
  16   before_validation :fill_field_defaults, :if => :new_record?
  17   before_validation :set_timestamps
  18   validates :command, :container_image, :output_path, :cwd, :priority, :presence => true
  19   validate :validate_state_change
  20   validate :validate_change
  21   validate :validate_lock
  22   validate :validate_output
  23   after_validation :assign_auth
  24   before_save :sort_serialized_attrs
  25   after_save :handle_completed
  26
  27   has_many :container_requests, :foreign_key => :container_uuid, :class_name => 'ContainerRequest', :primary_key => :uuid
  28   belongs_to :auth, :class_name => 'ApiClientAuthorization', :foreign_key => :auth_uuid, :primary_key => :uuid
  29
  30   api_accessible :user, extend: :common do |t|
  31     t.add :command
  32     t.add :container_image
  33     t.add :cwd
  34     t.add :environment
  35     t.add :exit_code
  36     t.add :finished_at
  37     t.add :locked_by_uuid
  38     t.add :log
  39     t.add :mounts
  40     t.add :output
  41     t.add :output_path
  42     t.add :priority
  43     t.add :progress
  44     t.add :runtime_constraints
  45     t.add :started_at
  46     t.add :state
  47     t.add :auth_uuid
  48     t.add :scheduling_parameters
  49   end
  50
  51   # Supported states for a container
  52   States =
  53     [
  54      (Queued = 'Queued'),
  55      (Locked = 'Locked'),
  56      (Running = 'Running'),
  57      (Complete = 'Complete'),
  58      (Cancelled = 'Cancelled')
  59     ]
  60
  61   State_transitions = {
  62     nil => [Queued],
  63     Queued => [Locked, Cancelled],
  64     Locked => [Queued, Running, Cancelled],
  65     Running => [Complete, Cancelled]
  66   }
  67
  68   def state_transitions
  69     State_transitions
  70   end
  71
  72   def update_priority!
  73     if [Queued, Locked, Running].include? self.state
  74       # Update the priority of this container to the maximum priority of any of
  75       # its committed container requests and save the record.
  76       self.priority = ContainerRequest.
  77         where(container_uuid: uuid,
  78               state: ContainerRequest::Committed).
  79         maximum('priority')
  80       self.save!
  81     end
  82   end
  83
  84   def self.find_reusable(attrs)
  85     candidates = Container.
  86       where('command = ?', attrs[:command].to_yaml).
  87       where('cwd = ?', attrs[:cwd]).
  88       where('environment = ?', self.deep_sort_hash(attrs[:environment]).to_yaml).
  89       where('output_path = ?', attrs[:output_path]).
  90       where('container_image = ?', attrs[:container_image]).
  91       where('mounts = ?', self.deep_sort_hash(attrs[:mounts]).to_yaml).
  92       where('runtime_constraints = ?', self.deep_sort_hash(attrs[:runtime_constraints]).to_yaml)
  93
  94     # Check for Completed candidates that had consistent outputs.
  95     completed = candidates.where(state: Complete).where(exit_code: 0)
  96     outputs = completed.select('output').group('output').limit(2)
  97     if outputs.count.count != 1
  98       Rails.logger.debug("Found #{outputs.count.length} different outputs")
  99     elsif Collection.
 100         readable_by(current_user).
 101         where(portable_data_hash: outputs.first.output).
 102         count < 1
 103       Rails.logger.info("Found reusable container(s) " +
 104                         "but output #{outputs.first} is not readable " +
 105                         "by user #{current_user.uuid}")
 106     else
 107       # Return the oldest eligible container whose log is still
 108       # present and readable by current_user.
 109       readable_pdh = Collection.
 110         readable_by(current_user).
 111         select('portable_data_hash')
 112       completed = completed.
 113         where("log in (#{readable_pdh.to_sql})").
 114         order('finished_at asc').
 115         limit(1)
 116       if completed.first
 117         return completed.first
 118       else
 119         Rails.logger.info("Found reusable container(s) but none with a log " +
 120                           "readable by user #{current_user.uuid}")
 121       end
 122     end
 123
 124     # Check for Running candidates and return the most likely to finish sooner.
 125     running = candidates.where(state: Running).
 126       order('progress desc, started_at asc').limit(1).first
 127     return running if not running.nil?
 128
 129     # Check for Locked or Queued ones and return the most likely to start first.
 130     locked_or_queued = candidates.where("state IN (?)", [Locked, Queued]).
 131       order('state asc, priority desc, created_at asc').limit(1).first
 132     return locked_or_queued if not locked_or_queued.nil?
 133
 134     # No suitable candidate found.
 135     nil
 136   end
 137
 138   def lock
 139     with_lock do
 140       if self.state == Locked
 141         raise AlreadyLockedError
 142       end
 143       self.state = Locked
 144       self.save!
 145     end
 146   end
 147
 148   def unlock
 149     with_lock do
 150       if self.state == Queued
 151         raise InvalidStateTransitionError
 152       end
 153       self.state = Queued
 154       self.save!
 155     end
 156   end
 157
 158   def self.readable_by(*users_list)
 159     if users_list.select { |u| u.is_admin }.any?
 160       return self
 161     end
 162     user_uuids = users_list.map { |u| u.uuid }
 163     uuid_list = user_uuids + users_list.flat_map { |u| u.groups_i_can(:read) }
 164     uuid_list.uniq!
 165     permitted = "(SELECT head_uuid FROM links WHERE link_class='permission' AND tail_uuid IN (:uuids))"
 166     joins(:container_requests).
 167       where("container_requests.uuid IN #{permitted} OR "+
 168             "container_requests.owner_uuid IN (:uuids)",
 169             uuids: uuid_list)
 170   end
 171
 172   def final?
 173     [Complete, Cancelled].include?(self.state)
 174   end
 175
 176   protected
 177
 178   def fill_field_defaults
 179     self.state ||= Queued
 180     self.environment ||= {}
 181     self.runtime_constraints ||= {}
 182     self.mounts ||= {}
 183     self.cwd ||= "."
 184     self.priority ||= 1
 185     self.scheduling_parameters ||= {}
 186   end
 187
 188   def permission_to_create
 189     current_user.andand.is_admin
 190   end
 191
 192   def permission_to_update
 193     # Override base permission check to allow auth_uuid to set progress and
 194     # output (only).  Whether it is legal to set progress and output in the current
 195     # state has already been checked in validate_change.
 196     current_user.andand.is_admin ||
 197       (!current_api_client_authorization.nil? and
 198        [self.auth_uuid, self.locked_by_uuid].include? current_api_client_authorization.uuid)
 199   end
 200
 201   def ensure_owner_uuid_is_permitted
 202     # Override base permission check to allow auth_uuid to set progress and
 203     # output (only).  Whether it is legal to set progress and output in the current
 204     # state has already been checked in validate_change.
 205     if !current_api_client_authorization.nil? and self.auth_uuid == current_api_client_authorization.uuid
 206       check_update_whitelist [:progress, :output]
 207     else
 208       super
 209     end
 210   end
 211
 212   def set_timestamps
 213     if self.state_changed? and self.state == Running
 214       self.started_at ||= db_current_time
 215     end
 216
 217     if self.state_changed? and [Complete, Cancelled].include? self.state
 218       self.finished_at ||= db_current_time
 219     end
 220   end
 221
 222   def validate_change
 223     permitted = [:state]
 224
 225     if self.new_record?
 226       permitted.push(:owner_uuid, :command, :container_image, :cwd,
 227                      :environment, :mounts, :output_path, :priority,
 228                      :runtime_constraints, :scheduling_parameters)
 229     end
 230
 231     case self.state
 232     when Queued, Locked
 233       permitted.push :priority
 234
 235     when Running
 236       permitted.push :priority, :progress, :output
 237       if self.state_changed?
 238         permitted.push :started_at
 239       end
 240
 241     when Complete
 242       if self.state_was == Running
 243         permitted.push :finished_at, :output, :log, :exit_code
 244       end
 245
 246     when Cancelled
 247       case self.state_was
 248       when Running
 249         permitted.push :finished_at, :output, :log
 250       when Queued, Locked
 251         permitted.push :finished_at
 252       end
 253
 254     else
 255       # The state_transitions check will add an error message for this
 256       return false
 257     end
 258
 259     check_update_whitelist permitted
 260   end
 261
 262   def validate_lock
 263     if [Locked, Running].include? self.state
 264       # If the Container was already locked, locked_by_uuid must not
 265       # changes. Otherwise, the current auth gets the lock.
 266       need_lock = locked_by_uuid_was || current_api_client_authorization.andand.uuid
 267     else
 268       need_lock = nil
 269     end
 270
 271     # The caller can provide a new value for locked_by_uuid, but only
 272     # if it's exactly what we expect. This allows a caller to perform
 273     # an update like {"state":"Unlocked","locked_by_uuid":null}.
 274     if self.locked_by_uuid_changed?
 275       if self.locked_by_uuid != need_lock
 276         return errors.add :locked_by_uuid, "can only change to #{need_lock}"
 277       end
 278     end
 279     self.locked_by_uuid = need_lock
 280   end
 281
 282   def validate_output
 283     # Output must exist and be readable by the current user.  This is so
 284     # that a container cannot "claim" a collection that it doesn't otherwise
 285     # have access to just by setting the output field to the collection PDH.
 286     if output_changed?
 287       c = Collection.
 288           readable_by(current_user).
 289           where(portable_data_hash: self.output).
 290           first
 291       if !c
 292         errors.add :output, "collection must exist and be readable by current user."
 293       end
 294     end
 295   end
 296
 297   def assign_auth
 298     if self.auth_uuid_changed?
 299       return errors.add :auth_uuid, 'is readonly'
 300     end
 301     if not [Locked, Running].include? self.state
 302       # don't need one
 303       self.auth.andand.update_attributes(expires_at: db_current_time)
 304       self.auth = nil
 305       return
 306     elsif self.auth
 307       # already have one
 308       return
 309     end
 310     cr = ContainerRequest.
 311       where('container_uuid=? and priority>0', self.uuid).
 312       order('priority desc').
 313       first
 314     if !cr
 315       return errors.add :auth_uuid, "cannot be assigned because priority <= 0"
 316     end
 317     self.auth = ApiClientAuthorization.
 318       create!(user_id: User.find_by_uuid(cr.modified_by_user_uuid).id,
 319               api_client_id: 0)
 320   end
 321
 322   def sort_serialized_attrs
 323     if self.environment_changed?
 324       self.environment = self.class.deep_sort_hash(self.environment)
 325     end
 326     if self.mounts_changed?
 327       self.mounts = self.class.deep_sort_hash(self.mounts)
 328     end
 329     if self.runtime_constraints_changed?
 330       self.runtime_constraints = self.class.deep_sort_hash(self.runtime_constraints)
 331     end
 332     if self.scheduling_parameters_changed?
 333       self.scheduling_parameters = self.class.deep_sort_hash(self.scheduling_parameters)
 334     end
 335   end
 336
 337   def handle_completed
 338     # This container is finished so finalize any associated container requests
 339     # that are associated with this container.
 340     if self.state_changed? and self.final?
 341       act_as_system_user do
 342
 343         if self.state == Cancelled
 344           retryable_requests = ContainerRequest.where("container_uuid = ? and priority > 0 and state = 'Committed' and container_count < container_count_max", uuid)
 345         else
 346           retryable_requests = []
 347         end
 348
 349         if retryable_requests.any?
 350           c_attrs = {
 351             command: self.command,
 352             cwd: self.cwd,
 353             environment: self.environment,
 354             output_path: self.output_path,
 355             container_image: self.container_image,
 356             mounts: self.mounts,
 357             runtime_constraints: self.runtime_constraints,
 358             scheduling_parameters: self.scheduling_parameters
 359           }
 360           c = Container.create! c_attrs
 361           retryable_requests.each do |cr|
 362             cr.with_lock do
 363               # Use row locking because this increments container_count
 364               cr.container_uuid = c.uuid
 365               cr.save
 366             end
 367           end
 368         end
 369
 370         # Notify container requests associated with this container
 371         ContainerRequest.where(container_uuid: uuid,
 372                                state: ContainerRequest::Committed).each do |cr|
 373           cr.finalize!
 374         end
 375
 376         # Try to cancel any outstanding container requests made by this container.
 377         ContainerRequest.where(requesting_container_uuid: uuid,
 378                                state: ContainerRequest::Committed).each do |cr|
 379           cr.priority = 0
 380           cr.save
 381         end
 382       end
 383     end
 384   end
 385
 386 end