services/api/app/models/container.rb

   1 # Copyright (C) The Arvados Authors. All rights reserved.
   2 #
   3 # SPDX-License-Identifier: AGPL-3.0
   4
   5 require 'log_reuse_info'
   6 require 'whitelist_update'
   7 require 'safe_json'
   8 require 'update_priority'
   9
  10 class Container < ArvadosModel
  11   include ArvadosModelUpdates
  12   include HasUuid
  13   include KindAndEtag
  14   include CommonApiTemplate
  15   include WhitelistUpdate
  16   extend CurrentApiClient
  17   extend DbCurrentTime
  18   extend LogReuseInfo
  19
  20   # Posgresql JSONB columns should NOT be declared as serialized, Rails 5
  21   # already know how to properly treat them.
  22   attribute :secret_mounts, :jsonbHash, default: {}
  23   attribute :runtime_status, :jsonbHash, default: {}
  24   attribute :runtime_auth_scopes, :jsonbArray, default: []
  25   attribute :output_storage_classes, :jsonbArray, default: lambda { Rails.configuration.DefaultStorageClasses }
  26   attribute :output_properties, :jsonbHash, default: {}
  27
  28   serialize :environment, Hash
  29   serialize :mounts, Hash
  30   serialize :runtime_constraints, Hash
  31   serialize :command, Array
  32   serialize :scheduling_parameters, Hash
  33
  34   after_find :fill_container_defaults_after_find
  35   before_validation :fill_field_defaults, :if => :new_record?
  36   before_validation :set_timestamps
  37   before_validation :check_lock
  38   before_validation :check_unlock
  39   validates :command, :container_image, :output_path, :cwd, :priority, { presence: true }
  40   validates :priority, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  41   validate :validate_runtime_status
  42   validate :validate_state_change
  43   validate :validate_change
  44   validate :validate_lock
  45   validate :validate_output
  46   after_validation :assign_auth
  47   before_save :sort_serialized_attrs
  48   before_save :update_secret_mounts_md5
  49   before_save :scrub_secrets
  50   before_save :clear_runtime_status_when_queued
  51   after_save :update_cr_logs
  52   after_save :handle_completed
  53   after_save :propagate_priority
  54   after_commit { UpdatePriority.run_update_thread }
  55
  56   has_many :container_requests, :foreign_key => :container_uuid, :class_name => 'ContainerRequest', :primary_key => :uuid
  57   belongs_to :auth, :class_name => 'ApiClientAuthorization', :foreign_key => :auth_uuid, :primary_key => :uuid
  58
  59   api_accessible :user, extend: :common do |t|
  60     t.add :command
  61     t.add :container_image
  62     t.add :cwd
  63     t.add :environment
  64     t.add :exit_code
  65     t.add :finished_at
  66     t.add :locked_by_uuid
  67     t.add :log
  68     t.add :mounts
  69     t.add :output
  70     t.add :output_path
  71     t.add :priority
  72     t.add :progress
  73     t.add :runtime_constraints
  74     t.add :runtime_status
  75     t.add :started_at
  76     t.add :state
  77     t.add :auth_uuid
  78     t.add :scheduling_parameters
  79     t.add :runtime_user_uuid
  80     t.add :runtime_auth_scopes
  81     t.add :lock_count
  82     t.add :gateway_address
  83     t.add :interactive_session_started
  84     t.add :output_storage_classes
  85     t.add :output_properties
  86     t.add :cost
  87     t.add :subrequests_cost
  88   end
  89
  90   # Supported states for a container
  91   States =
  92     [
  93      (Queued = 'Queued'),
  94      (Locked = 'Locked'),
  95      (Running = 'Running'),
  96      (Complete = 'Complete'),
  97      (Cancelled = 'Cancelled')
  98     ]
  99
 100   State_transitions = {
 101     nil => [Queued],
 102     Queued => [Locked, Cancelled],
 103     Locked => [Queued, Running, Cancelled],
 104     Running => [Complete, Cancelled],
 105     Complete => [Cancelled]
 106   }
 107
 108   def self.limit_index_columns_read
 109     ["mounts"]
 110   end
 111
 112   def self.full_text_searchable_columns
 113     super - ["secret_mounts", "secret_mounts_md5", "runtime_token", "gateway_address", "output_storage_classes"]
 114   end
 115
 116   def self.searchable_columns *args
 117     super - ["secret_mounts_md5", "runtime_token", "gateway_address", "output_storage_classes"]
 118   end
 119
 120   def logged_attributes
 121     super.except('secret_mounts', 'runtime_token')
 122   end
 123
 124   def state_transitions
 125     State_transitions
 126   end
 127
 128   # Container priority is the highest "computed priority" of any
 129   # matching request. The computed priority of a container-submitted
 130   # request is the priority of the submitting container. The computed
 131   # priority of a user-submitted request is a function of
 132   # user-assigned priority and request creation time.
 133   def update_priority!
 134     return if ![Queued, Locked, Running].include?(state)
 135     p = ContainerRequest.
 136         where('container_uuid=? and priority>0', uuid).
 137         includes(:requesting_container).
 138         lock(true).
 139         map do |cr|
 140       if cr.requesting_container
 141         cr.requesting_container.priority
 142       else
 143         (cr.priority << 50) - (cr.created_at.to_time.to_f * 1000).to_i
 144       end
 145     end.max || 0
 146     update_attributes!(priority: p)
 147   end
 148
 149   def propagate_priority
 150     return true unless saved_change_to_priority?
 151     act_as_system_user do
 152       # Update the priority of child container requests to match new
 153       # priority of the parent container (ignoring requests with no
 154       # container assigned, because their priority doesn't matter).
 155       ContainerRequest.
 156         where(requesting_container_uuid: self.uuid,
 157               state: ContainerRequest::Committed).
 158         where('container_uuid is not null').
 159         includes(:container).
 160         map(&:container).
 161         map(&:update_priority!)
 162     end
 163   end
 164
 165   # Create a new container (or find an existing one) to satisfy the
 166   # given container request.
 167   def self.resolve(req)
 168     if req.runtime_token.nil?
 169       runtime_user = if req.modified_by_user_uuid.nil?
 170                        current_user
 171                      else
 172                        User.find_by_uuid(req.modified_by_user_uuid)
 173                      end
 174       runtime_auth_scopes = ["all"]
 175     else
 176       auth = ApiClientAuthorization.validate(token: req.runtime_token)
 177       if auth.nil?
 178         raise ArgumentError.new "Invalid runtime token"
 179       end
 180       runtime_user = User.find_by_id(auth.user_id)
 181       runtime_auth_scopes = auth.scopes
 182     end
 183     c_attrs = act_as_user runtime_user do
 184       {
 185         command: req.command,
 186         cwd: req.cwd,
 187         environment: req.environment,
 188         output_path: req.output_path,
 189         container_image: resolve_container_image(req.container_image),
 190         mounts: resolve_mounts(req.mounts),
 191         runtime_constraints: resolve_runtime_constraints(req.runtime_constraints),
 192         scheduling_parameters: req.scheduling_parameters,
 193         secret_mounts: req.secret_mounts,
 194         runtime_token: req.runtime_token,
 195         runtime_user_uuid: runtime_user.uuid,
 196         runtime_auth_scopes: runtime_auth_scopes,
 197         output_storage_classes: req.output_storage_classes,
 198       }
 199     end
 200     act_as_system_user do
 201       if req.use_existing && (reusable = find_reusable(c_attrs))
 202         reusable
 203       else
 204         Container.create!(c_attrs)
 205       end
 206     end
 207   end
 208
 209   # Return a runtime_constraints hash that complies with requested but
 210   # is suitable for saving in a container record, i.e., has specific
 211   # values instead of ranges.
 212   #
 213   # Doing this as a step separate from other resolutions, like "git
 214   # revision range to commit hash", makes sense only when there is no
 215   # opportunity to reuse an existing container (e.g., container reuse
 216   # is not implemented yet, or we have already found that no existing
 217   # containers are suitable).
 218   def self.resolve_runtime_constraints(runtime_constraints)
 219     rc = {}
 220     runtime_constraints.each do |k, v|
 221       if v.is_a? Array
 222         rc[k] = v[0]
 223       else
 224         rc[k] = v
 225       end
 226     end
 227     if rc['keep_cache_ram'] == 0
 228       rc['keep_cache_ram'] = Rails.configuration.Containers.DefaultKeepCacheRAM
 229     end
 230     rc
 231   end
 232
 233   # Return a mounts hash suitable for a Container, i.e., with every
 234   # readonly collection UUID resolved to a PDH.
 235   def self.resolve_mounts(mounts)
 236     c_mounts = {}
 237     mounts.each do |k, mount|
 238       mount = mount.dup
 239       c_mounts[k] = mount
 240       if mount['kind'] != 'collection'
 241         next
 242       end
 243
 244       uuid = mount.delete 'uuid'
 245
 246       if mount['portable_data_hash'].nil? and !uuid.nil?
 247         # PDH not supplied, try by UUID
 248         c = Collection.
 249           readable_by(current_user).
 250           where(uuid: uuid).
 251           select(:portable_data_hash).
 252           first
 253         if !c
 254           raise ArvadosModel::UnresolvableContainerError.new "cannot mount collection #{uuid.inspect}: not found"
 255         end
 256         mount['portable_data_hash'] = c.portable_data_hash
 257       end
 258     end
 259     return c_mounts
 260   end
 261
 262   # Return a container_image PDH suitable for a Container.
 263   def self.resolve_container_image(container_image)
 264     coll = Collection.for_latest_docker_image(container_image)
 265     if !coll
 266       raise ArvadosModel::UnresolvableContainerError.new "docker image #{container_image.inspect} not found"
 267     end
 268     coll.portable_data_hash
 269   end
 270
 271   def self.find_reusable(attrs)
 272     log_reuse_info { "starting with #{Container.all.count} container records in database" }
 273     candidates = Container.where_serialized(:command, attrs[:command], md5: true)
 274     log_reuse_info(candidates) { "after filtering on command #{attrs[:command].inspect}" }
 275
 276     candidates = candidates.where('cwd = ?', attrs[:cwd])
 277     log_reuse_info(candidates) { "after filtering on cwd #{attrs[:cwd].inspect}" }
 278
 279     candidates = candidates.where_serialized(:environment, attrs[:environment], md5: true)
 280     log_reuse_info(candidates) { "after filtering on environment #{attrs[:environment].inspect}" }
 281
 282     candidates = candidates.where('output_path = ?', attrs[:output_path])
 283     log_reuse_info(candidates) { "after filtering on output_path #{attrs[:output_path].inspect}" }
 284
 285     image = resolve_container_image(attrs[:container_image])
 286     candidates = candidates.where('container_image = ?', image)
 287     log_reuse_info(candidates) { "after filtering on container_image #{image.inspect} (resolved from #{attrs[:container_image].inspect})" }
 288
 289     candidates = candidates.where_serialized(:mounts, resolve_mounts(attrs[:mounts]), md5: true)
 290     log_reuse_info(candidates) { "after filtering on mounts #{attrs[:mounts].inspect}" }
 291
 292     secret_mounts_md5 = Digest::MD5.hexdigest(SafeJSON.dump(self.deep_sort_hash(attrs[:secret_mounts])))
 293     candidates = candidates.where('secret_mounts_md5 = ?', secret_mounts_md5)
 294     log_reuse_info(candidates) { "after filtering on secret_mounts_md5 #{secret_mounts_md5.inspect}" }
 295
 296     if attrs[:runtime_constraints]['cuda'].nil?
 297       attrs[:runtime_constraints]['cuda'] = {
 298         'device_count' => 0,
 299         'driver_version' => '',
 300         'hardware_capability' => '',
 301       }
 302     end
 303     resolved_runtime_constraints = [resolve_runtime_constraints(attrs[:runtime_constraints])]
 304     if resolved_runtime_constraints[0]['cuda']['device_count'] == 0
 305       # If no CUDA requested, extend search to include older container
 306       # records that don't have a 'cuda' section in runtime_constraints
 307       resolved_runtime_constraints << resolved_runtime_constraints[0].except('cuda')
 308     end
 309
 310     candidates = candidates.where_serialized(:runtime_constraints, resolved_runtime_constraints, md5: true, multivalue: true)
 311     log_reuse_info(candidates) { "after filtering on runtime_constraints #{attrs[:runtime_constraints].inspect}" }
 312
 313     log_reuse_info { "checking for state=Complete with readable output and log..." }
 314
 315     select_readable_pdh = Collection.
 316       readable_by(current_user).
 317       select(:portable_data_hash).
 318       to_sql
 319
 320     usable = candidates.where(state: Complete, exit_code: 0)
 321     log_reuse_info(usable) { "with state=Complete, exit_code=0" }
 322
 323     usable = usable.where("log IN (#{select_readable_pdh})")
 324     log_reuse_info(usable) { "with readable log" }
 325
 326     usable = usable.where("output IN (#{select_readable_pdh})")
 327     log_reuse_info(usable) { "with readable output" }
 328
 329     usable = usable.order('finished_at ASC').limit(1).first
 330     if usable
 331       log_reuse_info { "done, reusing container #{usable.uuid} with state=Complete" }
 332       return usable
 333     end
 334
 335     # Check for non-failing Running candidates and return the most likely to finish sooner.
 336     log_reuse_info { "checking for state=Running..." }
 337     running = candidates.where(state: Running).
 338               where("(runtime_status->'error') is null").
 339               order('progress desc, started_at asc').
 340               limit(1).first
 341     if running
 342       log_reuse_info { "done, reusing container #{running.uuid} with state=Running" }
 343       return running
 344     else
 345       log_reuse_info { "have no containers in Running state" }
 346     end
 347
 348     # Check for Locked or Queued ones and return the most likely to start first.
 349     locked_or_queued = candidates.
 350                        where("state IN (?)", [Locked, Queued]).
 351                        order('state asc, priority desc, created_at asc').
 352                        limit(1).first
 353     if locked_or_queued
 354       log_reuse_info { "done, reusing container #{locked_or_queued.uuid} with state=#{locked_or_queued.state}" }
 355       return locked_or_queued
 356     else
 357       log_reuse_info { "have no containers in Locked or Queued state" }
 358     end
 359
 360     log_reuse_info { "done, no reusable container found" }
 361     nil
 362   end
 363
 364   def lock
 365     self.with_lock do
 366       if self.state != Queued
 367         raise LockFailedError.new("cannot lock when #{self.state}")
 368       end
 369       self.update_attributes!(state: Locked)
 370     end
 371   end
 372
 373   def check_lock
 374     if state_was == Queued and state == Locked
 375       if self.priority <= 0
 376         raise LockFailedError.new("cannot lock when priority<=0")
 377       end
 378       self.lock_count = self.lock_count+1
 379     end
 380   end
 381
 382   def unlock
 383     self.with_lock do
 384       if self.state != Locked
 385         raise InvalidStateTransitionError.new("cannot unlock when #{self.state}")
 386       end
 387       self.update_attributes!(state: Queued)
 388     end
 389   end
 390
 391   def check_unlock
 392     if state_was == Locked and state == Queued
 393       if self.locked_by_uuid != current_api_client_authorization.uuid
 394         raise ArvadosModel::PermissionDeniedError.new("locked by a different token")
 395       end
 396       if self.lock_count >= Rails.configuration.Containers.MaxDispatchAttempts
 397         self.state = Cancelled
 398         self.runtime_status = {error: "Failed to start container.  Cancelled after exceeding 'Containers.MaxDispatchAttempts' (lock_count=#{self.lock_count})"}
 399       end
 400     end
 401   end
 402
 403   def self.readable_by(*users_list)
 404     # Load optional keyword arguments, if they exist.
 405     if users_list.last.is_a? Hash
 406       kwargs = users_list.pop
 407     else
 408       kwargs = {}
 409     end
 410     if users_list.select { |u| u.is_admin }.any?
 411       return super
 412     end
 413     Container.where(ContainerRequest.readable_by(*users_list).where("containers.uuid = container_requests.container_uuid").arel.exists)
 414   end
 415
 416   def final?
 417     [Complete, Cancelled].include?(self.state)
 418   end
 419
 420   def self.for_current_token
 421     return if !current_api_client_authorization
 422     _, _, _, container_uuid = Thread.current[:token].split('/')
 423     if container_uuid.nil?
 424       Container.where(auth_uuid: current_api_client_authorization.uuid).first
 425     else
 426       Container.where('auth_uuid=? or (uuid=? and runtime_token=?)',
 427                       current_api_client_authorization.uuid,
 428                       container_uuid,
 429                       current_api_client_authorization.token).first
 430     end
 431   end
 432
 433   protected
 434
 435   def fill_field_defaults
 436     self.state ||= Queued
 437     self.environment ||= {}
 438     self.runtime_constraints ||= {}
 439     self.mounts ||= {}
 440     self.cwd ||= "."
 441     self.priority ||= 0
 442     self.scheduling_parameters ||= {}
 443   end
 444
 445   def permission_to_create
 446     current_user.andand.is_admin
 447   end
 448
 449   def permission_to_destroy
 450     current_user.andand.is_admin
 451   end
 452
 453   def ensure_owner_uuid_is_permitted
 454     # validate_change ensures owner_uuid can't be changed at all --
 455     # except during create, which requires admin privileges. Checking
 456     # permission here would be superfluous.
 457     true
 458   end
 459
 460   def set_timestamps
 461     if self.state_changed? and self.state == Running
 462       self.started_at ||= db_current_time
 463     end
 464
 465     if self.state_changed? and [Complete, Cancelled].include? self.state
 466       self.finished_at ||= db_current_time
 467     end
 468   end
 469
 470   # Check that well-known runtime status keys have desired data types
 471   def validate_runtime_status
 472     [
 473       'error', 'errorDetail', 'warning', 'warningDetail', 'activity'
 474     ].each do |k|
 475       if self.runtime_status.andand.include?(k) && !self.runtime_status[k].is_a?(String)
 476         errors.add(:runtime_status, "'#{k}' value must be a string")
 477       end
 478     end
 479   end
 480
 481   def validate_change
 482     permitted = [:state]
 483     final_attrs = [:finished_at]
 484     progress_attrs = [:progress, :runtime_status, :subrequests_cost, :cost,
 485                       :log, :output, :output_properties, :exit_code]
 486
 487     if self.new_record?
 488       permitted.push(:owner_uuid, :command, :container_image, :cwd,
 489                      :environment, :mounts, :output_path, :priority,
 490                      :runtime_constraints, :scheduling_parameters,
 491                      :secret_mounts, :runtime_token,
 492                      :runtime_user_uuid, :runtime_auth_scopes,
 493                      :output_storage_classes)
 494     end
 495
 496     case self.state
 497     when Locked
 498       permitted.push :priority, :runtime_status, :log, :lock_count
 499
 500     when Queued
 501       permitted.push :priority
 502
 503     when Running
 504       permitted.push :priority, :output_properties, :gateway_address, *progress_attrs
 505       if self.state_changed?
 506         permitted.push :started_at
 507       end
 508       if !self.interactive_session_started_was
 509         permitted.push :interactive_session_started
 510       end
 511
 512     when Complete
 513       if self.state_was == Running
 514         permitted.push *final_attrs, *progress_attrs
 515       end
 516
 517     when Cancelled
 518       case self.state_was
 519       when Running
 520         permitted.push :finished_at, *progress_attrs
 521       when Queued, Locked
 522         permitted.push :finished_at, :log, :runtime_status, :cost
 523       end
 524
 525     else
 526       # The state_transitions check will add an error message for this
 527       return false
 528     end
 529
 530     if self.state_was == Running &&
 531        !current_api_client_authorization.nil? &&
 532        (current_api_client_authorization.uuid == self.auth_uuid ||
 533         current_api_client_authorization.token == self.runtime_token)
 534       # The contained process itself can write final attrs but can't
 535       # change priority or log.
 536       permitted.push *final_attrs
 537       permitted = permitted - [:log, :priority]
 538     elsif !current_user.andand.is_admin
 539       raise PermissionDeniedError
 540     elsif self.locked_by_uuid && self.locked_by_uuid != current_api_client_authorization.andand.uuid
 541       # When locked, progress fields cannot be updated by the wrong
 542       # dispatcher, even though it has admin privileges.
 543       permitted = permitted - progress_attrs
 544     end
 545     check_update_whitelist permitted
 546   end
 547
 548   def validate_lock
 549     if [Locked, Running].include? self.state
 550       # If the Container was already locked, locked_by_uuid must not
 551       # changes. Otherwise, the current auth gets the lock.
 552       need_lock = locked_by_uuid_was || current_api_client_authorization.andand.uuid
 553     else
 554       need_lock = nil
 555     end
 556
 557     # The caller can provide a new value for locked_by_uuid, but only
 558     # if it's exactly what we expect. This allows a caller to perform
 559     # an update like {"state":"Unlocked","locked_by_uuid":null}.
 560     if self.locked_by_uuid_changed?
 561       if self.locked_by_uuid != need_lock
 562         return errors.add :locked_by_uuid, "can only change to #{need_lock}"
 563       end
 564     end
 565     self.locked_by_uuid = need_lock
 566   end
 567
 568   def validate_output
 569     # Output must exist and be readable by the current user.  This is so
 570     # that a container cannot "claim" a collection that it doesn't otherwise
 571     # have access to just by setting the output field to the collection PDH.
 572     if output_changed?
 573       c = Collection.
 574             readable_by(current_user, {include_trash: true}).
 575             where(portable_data_hash: self.output).
 576             first
 577       if !c
 578         errors.add :output, "collection must exist and be readable by current user."
 579       end
 580     end
 581   end
 582
 583   def update_cr_logs
 584     # If self.final?, this update is superfluous: the final log/output
 585     # update will be done when handle_completed calls finalize! on
 586     # each requesting CR.
 587     return if self.final? || !saved_change_to_log?
 588     leave_modified_by_user_alone do
 589       ContainerRequest.where(container_uuid: self.uuid).each do |cr|
 590         cr.update_collections(container: self, collections: ['log'])
 591         cr.save!
 592       end
 593     end
 594   end
 595
 596   def assign_auth
 597     if self.auth_uuid_changed?
 598          return errors.add :auth_uuid, 'is readonly'
 599     end
 600     if not [Locked, Running].include? self.state
 601       # Don't need one. If auth already exists, expire it.
 602       #
 603       # We use db_transaction_time here (not db_current_time) to
 604       # ensure the token doesn't validate later in the same
 605       # transaction (e.g., in a test case) by satisfying expires_at >
 606       # transaction timestamp.
 607       self.auth.andand.update_attributes(expires_at: db_transaction_time)
 608       self.auth = nil
 609       return
 610     elsif self.auth
 611       # already have one
 612       return
 613     end
 614     if self.runtime_token.nil?
 615       if self.runtime_user_uuid.nil?
 616         # legacy behavior, we don't have a runtime_user_uuid so get
 617         # the user from the highest priority container request, needed
 618         # when performing an upgrade and there are queued containers,
 619         # and some tests.
 620         cr = ContainerRequest.
 621                where('container_uuid=? and priority>0', self.uuid).
 622                order('priority desc').
 623                first
 624         if !cr
 625           return errors.add :auth_uuid, "cannot be assigned because priority <= 0"
 626         end
 627         self.runtime_user_uuid = cr.modified_by_user_uuid
 628         self.runtime_auth_scopes = ["all"]
 629       end
 630
 631       # Generate a new token. This runs with admin credentials as it's done by a
 632       # dispatcher user, so expires_at isn't enforced by API.MaxTokenLifetime.
 633       self.auth = ApiClientAuthorization.
 634                     create!(user_id: User.find_by_uuid(self.runtime_user_uuid).id,
 635                             api_client_id: 0,
 636                             scopes: self.runtime_auth_scopes)
 637     end
 638   end
 639
 640   def sort_serialized_attrs
 641     if self.environment_changed?
 642       self.environment = self.class.deep_sort_hash(self.environment)
 643     end
 644     if self.mounts_changed?
 645       self.mounts = self.class.deep_sort_hash(self.mounts)
 646     end
 647     if self.runtime_constraints_changed?
 648       self.runtime_constraints = self.class.deep_sort_hash(self.runtime_constraints)
 649     end
 650     if self.scheduling_parameters_changed?
 651       self.scheduling_parameters = self.class.deep_sort_hash(self.scheduling_parameters)
 652     end
 653     if self.runtime_auth_scopes_changed?
 654       self.runtime_auth_scopes = self.runtime_auth_scopes.sort
 655     end
 656   end
 657
 658   def update_secret_mounts_md5
 659     if self.secret_mounts_changed?
 660       self.secret_mounts_md5 = Digest::MD5.hexdigest(
 661         SafeJSON.dump(self.class.deep_sort_hash(self.secret_mounts)))
 662     end
 663   end
 664
 665   def scrub_secrets
 666     # this runs after update_secret_mounts_md5, so the
 667     # secret_mounts_md5 will still reflect the secrets that are being
 668     # scrubbed here.
 669     if self.state_changed? && self.final?
 670       self.secret_mounts = {}
 671       self.runtime_token = nil
 672     end
 673   end
 674
 675   def clear_runtime_status_when_queued
 676     # Avoid leaking status messages between different dispatch attempts
 677     if self.state_was == Locked && self.state == Queued
 678       self.runtime_status = {}
 679     end
 680   end
 681
 682   def handle_completed
 683     # This container is finished so finalize any associated container requests
 684     # that are associated with this container.
 685     if saved_change_to_state? and self.final?
 686       # These get wiped out by with_lock (which reloads the record),
 687       # so record them now in case we need to schedule a retry.
 688       prev_secret_mounts = secret_mounts_before_last_save
 689       prev_runtime_token = runtime_token_before_last_save
 690
 691       # Need to take a lock on the container to ensure that any
 692       # concurrent container requests that might try to reuse this
 693       # container will block until the container completion
 694       # transaction finishes.  This ensure that concurrent container
 695       # requests that try to reuse this container are finalized (on
 696       # Complete) or don't reuse it (on Cancelled).
 697       self.with_lock do
 698         act_as_system_user do
 699           if self.state == Cancelled
 700             retryable_requests = ContainerRequest.where("container_uuid = ? and priority > 0 and state = 'Committed' and container_count < container_count_max", uuid)
 701           else
 702             retryable_requests = []
 703           end
 704
 705           if retryable_requests.any?
 706             c_attrs = {
 707               command: self.command,
 708               cwd: self.cwd,
 709               environment: self.environment,
 710               output_path: self.output_path,
 711               container_image: self.container_image,
 712               mounts: self.mounts,
 713               runtime_constraints: self.runtime_constraints,
 714               scheduling_parameters: self.scheduling_parameters,
 715               secret_mounts: prev_secret_mounts,
 716               runtime_token: prev_runtime_token,
 717               runtime_user_uuid: self.runtime_user_uuid,
 718               runtime_auth_scopes: self.runtime_auth_scopes
 719             }
 720             c = Container.create! c_attrs
 721             retryable_requests.each do |cr|
 722               cr.with_lock do
 723                 leave_modified_by_user_alone do
 724                   # Use row locking because this increments container_count
 725                   cr.cumulative_cost += self.cost + self.subrequests_cost
 726                   cr.container_uuid = c.uuid
 727                   cr.save!
 728                 end
 729               end
 730             end
 731           end
 732
 733           # Notify container requests associated with this container
 734           ContainerRequest.where(container_uuid: uuid,
 735                                  state: ContainerRequest::Committed).each do |cr|
 736             leave_modified_by_user_alone do
 737               cr.finalize!
 738             end
 739           end
 740
 741           # Cancel outstanding container requests made by this container.
 742           ContainerRequest.
 743             includes(:container).
 744             where(requesting_container_uuid: uuid,
 745                   state: ContainerRequest::Committed).each do |cr|
 746             leave_modified_by_user_alone do
 747               cr.update_attributes!(priority: 0)
 748               cr.container.reload
 749               if cr.container.state == Container::Queued || cr.container.state == Container::Locked
 750                 # If the child container hasn't started yet, finalize the
 751                 # child CR now instead of leaving it "on hold", i.e.,
 752                 # Queued with priority 0.  (OTOH, if the child is already
 753                 # running, leave it alone so it can get cancelled the
 754                 # usual way, get a copy of the log collection, etc.)
 755                 cr.update_attributes!(state: ContainerRequest::Final)
 756               end
 757             end
 758           end
 759         end
 760       end
 761     end
 762   end
 763 end