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