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_priorities'
   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   serialize :output_glob, Array
  34
  35   after_find :fill_container_defaults_after_find
  36   before_validation :fill_field_defaults, :if => :new_record?
  37   before_validation :set_timestamps
  38   before_validation :check_lock
  39   before_validation :check_unlock
  40   validates :command, :container_image, :output_path, :cwd, :priority, { presence: true }
  41   validates :priority, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  42   validate :validate_runtime_status
  43   validate :validate_state_change
  44   validate :validate_change
  45   validate :validate_lock
  46   validate :validate_output
  47   after_validation :assign_auth
  48   before_save :sort_serialized_attrs
  49   before_save :update_secret_mounts_md5
  50   before_save :scrub_secrets
  51   before_save :clear_runtime_status_when_queued
  52   after_save :update_cr_logs
  53   after_save :handle_completed
  54
  55   has_many :container_requests,
  56            class_name: 'ContainerRequest',
  57            foreign_key: 'container_uuid',
  58            primary_key: 'uuid'
  59   belongs_to :auth,
  60              class_name: 'ApiClientAuthorization',
  61              foreign_key: 'auth_uuid',
  62              primary_key: 'uuid',
  63              optional: true
  64
  65   api_accessible :user, extend: :common do |t|
  66     t.add :command
  67     t.add :container_image
  68     t.add :cwd
  69     t.add :environment
  70     t.add :exit_code
  71     t.add :finished_at
  72     t.add :locked_by_uuid
  73     t.add :log
  74     t.add :mounts
  75     t.add :output
  76     t.add :output_path
  77     t.add :output_glob
  78     t.add :priority
  79     t.add :progress
  80     t.add :runtime_constraints
  81     t.add :runtime_status
  82     t.add :started_at
  83     t.add :state
  84     t.add :auth_uuid
  85     t.add :scheduling_parameters
  86     t.add :runtime_user_uuid
  87     t.add :runtime_auth_scopes
  88     t.add :lock_count
  89     t.add :gateway_address
  90     t.add :interactive_session_started
  91     t.add :output_storage_classes
  92     t.add :output_properties
  93     t.add :cost
  94     t.add :subrequests_cost
  95   end
  96
  97   # Supported states for a container
  98   States =
  99     [
 100      (Queued = 'Queued'),
 101      (Locked = 'Locked'),
 102      (Running = 'Running'),
 103      (Complete = 'Complete'),
 104      (Cancelled = 'Cancelled')
 105     ]
 106
 107   State_transitions = {
 108     nil => [Queued],
 109     Queued => [Locked, Cancelled],
 110     Locked => [Queued, Running, Cancelled],
 111     Running => [Complete, Cancelled],
 112     Complete => [Cancelled]
 113   }
 114
 115   def self.limit_index_columns_read
 116     ["mounts"]
 117   end
 118
 119   def self.full_text_searchable_columns
 120     super - ["secret_mounts", "secret_mounts_md5", "runtime_token", "gateway_address", "output_storage_classes"]
 121   end
 122
 123   def self.searchable_columns *args
 124     super - ["secret_mounts_md5", "runtime_token", "gateway_address", "output_storage_classes"]
 125   end
 126
 127   def logged_attributes
 128     super.except('secret_mounts', 'runtime_token')
 129   end
 130
 131   def state_transitions
 132     State_transitions
 133   end
 134
 135   # Container priority is the highest "computed priority" of any
 136   # matching request. The computed priority of a container-submitted
 137   # request is the priority of the submitting container. The computed
 138   # priority of a user-submitted request is a function of
 139   # user-assigned priority and request creation time.
 140   def update_priority!
 141     update_priorities uuid
 142     reload
 143   end
 144
 145   # Create a new container (or find an existing one) to satisfy the
 146   # given container request.
 147   def self.resolve(req)
 148     if req.runtime_token.nil?
 149       runtime_user = if req.modified_by_user_uuid.nil?
 150                        current_user
 151                      else
 152                        User.find_by_uuid(req.modified_by_user_uuid)
 153                      end
 154       runtime_auth_scopes = ["all"]
 155     else
 156       auth = ApiClientAuthorization.validate(token: req.runtime_token)
 157       if auth.nil?
 158         raise ArgumentError.new "Invalid runtime token"
 159       end
 160       runtime_user = User.find_by_id(auth.user_id)
 161       runtime_auth_scopes = auth.scopes
 162     end
 163     c_attrs = act_as_user runtime_user do
 164       {
 165         command: req.command,
 166         cwd: req.cwd,
 167         environment: req.environment,
 168         output_path: req.output_path,
 169         output_glob: req.output_glob,
 170         container_image: resolve_container_image(req.container_image),
 171         mounts: resolve_mounts(req.mounts),
 172         runtime_constraints: resolve_runtime_constraints(req.runtime_constraints),
 173         scheduling_parameters: req.scheduling_parameters,
 174         secret_mounts: req.secret_mounts,
 175         runtime_token: req.runtime_token,
 176         runtime_user_uuid: runtime_user.uuid,
 177         runtime_auth_scopes: runtime_auth_scopes,
 178         output_storage_classes: req.output_storage_classes,
 179       }
 180     end
 181     act_as_system_user do
 182       if req.use_existing && (reusable = find_reusable(c_attrs))
 183         reusable
 184       else
 185         Container.create!(c_attrs)
 186       end
 187     end
 188   end
 189
 190   # Return a runtime_constraints hash that complies with requested but
 191   # is suitable for saving in a container record, i.e., has specific
 192   # values instead of ranges.
 193   #
 194   # Doing this as a step separate from other resolutions, like "git
 195   # revision range to commit hash", makes sense only when there is no
 196   # opportunity to reuse an existing container (e.g., container reuse
 197   # is not implemented yet, or we have already found that no existing
 198   # containers are suitable).
 199   def self.resolve_runtime_constraints(runtime_constraints)
 200     rc = {}
 201     runtime_constraints.each do |k, v|
 202       if v.is_a? Array
 203         rc[k] = v[0]
 204       else
 205         rc[k] = v
 206       end
 207     end
 208     if rc['keep_cache_ram'] == 0
 209       rc['keep_cache_ram'] = Rails.configuration.Containers.DefaultKeepCacheRAM
 210     end
 211     if rc['keep_cache_disk'] == 0 and rc['keep_cache_ram'] == 0
 212       rc['keep_cache_disk'] = bound_keep_cache_disk(rc['ram'])
 213     end
 214     rc
 215   end
 216
 217   # Return a mounts hash suitable for a Container, i.e., with every
 218   # readonly collection UUID resolved to a PDH.
 219   def self.resolve_mounts(mounts)
 220     c_mounts = {}
 221     mounts.each do |k, mount|
 222       mount = mount.dup
 223       c_mounts[k] = mount
 224       if mount['kind'] != 'collection'
 225         next
 226       end
 227
 228       uuid = mount.delete 'uuid'
 229
 230       if mount['portable_data_hash'].nil? and !uuid.nil?
 231         # PDH not supplied, try by UUID
 232         c = Collection.
 233           readable_by(current_user).
 234           where(uuid: uuid).
 235           select(:portable_data_hash).
 236           first
 237         if !c
 238           raise ArvadosModel::UnresolvableContainerError.new "cannot mount collection #{uuid.inspect}: not found"
 239         end
 240         mount['portable_data_hash'] = c.portable_data_hash
 241       end
 242     end
 243     return c_mounts
 244   end
 245
 246   # Return a container_image PDH suitable for a Container.
 247   def self.resolve_container_image(container_image)
 248     coll = Collection.for_latest_docker_image(container_image)
 249     if !coll
 250       raise ArvadosModel::UnresolvableContainerError.new "docker image #{container_image.inspect} not found"
 251     end
 252     coll.portable_data_hash
 253   end
 254
 255   def self.find_reusable(attrs)
 256     log_reuse_info { "starting with #{Container.all.count} container records in database" }
 257     candidates = Container.where_serialized(:command, attrs[:command], md5: true)
 258     log_reuse_info(candidates) { "after filtering on command #{attrs[:command].inspect}" }
 259
 260     candidates = candidates.where('cwd = ?', attrs[:cwd])
 261     log_reuse_info(candidates) { "after filtering on cwd #{attrs[:cwd].inspect}" }
 262
 263     candidates = candidates.where_serialized(:environment, attrs[:environment], md5: true)
 264     log_reuse_info(candidates) { "after filtering on environment #{attrs[:environment].inspect}" }
 265
 266     candidates = candidates.where('output_path = ?', attrs[:output_path])
 267     log_reuse_info(candidates) { "after filtering on output_path #{attrs[:output_path].inspect}" }
 268
 269     candidates = candidates.where_serialized(:output_glob, attrs[:output_glob], md5: true)
 270     log_reuse_info(candidates) { "after filtering on output_glob #{attrs[:output_glob].inspect}" }
 271
 272     image = resolve_container_image(attrs[:container_image])
 273     candidates = candidates.where('container_image = ?', image)
 274     log_reuse_info(candidates) { "after filtering on container_image #{image.inspect} (resolved from #{attrs[:container_image].inspect})" }
 275
 276     candidates = candidates.where_serialized(:mounts, resolve_mounts(attrs[:mounts]), md5: true)
 277     log_reuse_info(candidates) { "after filtering on mounts #{attrs[:mounts].inspect}" }
 278
 279     secret_mounts_md5 = Digest::MD5.hexdigest(SafeJSON.dump(self.deep_sort_hash(attrs[:secret_mounts])))
 280     candidates = candidates.where('secret_mounts_md5 = ?', secret_mounts_md5)
 281     log_reuse_info(candidates) { "after filtering on secret_mounts_md5 #{secret_mounts_md5.inspect}" }
 282
 283     resolved_runtime_constraints = resolve_runtime_constraints(attrs[:runtime_constraints])
 284     # Ideally we would completely ignore Keep cache constraints when making
 285     # reuse considerations, but our database structure makes that impractical.
 286     # The best we can do is generate a search that matches on all likely values.
 287     runtime_constraint_variations = {
 288       keep_cache_disk: [
 289         # Check for constraints without keep_cache_disk
 290         # (containers that predate the constraint)
 291         nil,
 292         # Containers that use keep_cache_ram instead
 293         0,
 294         # The default value
 295         bound_keep_cache_disk(resolved_runtime_constraints['ram']),
 296         # The minimum default bound
 297         bound_keep_cache_disk(0),
 298         # The maximum default bound (presumably)
 299         bound_keep_cache_disk(1 << 60),
 300         # The requested value
 301         resolved_runtime_constraints.delete('keep_cache_disk'),
 302       ].uniq,
 303       keep_cache_ram: [
 304         # Containers that use keep_cache_disk instead
 305         0,
 306         # The default value
 307         Rails.configuration.Containers.DefaultKeepCacheRAM,
 308         # The requested value
 309         resolved_runtime_constraints.delete('keep_cache_ram'),
 310       ].uniq,
 311     }
 312     resolved_cuda = resolved_runtime_constraints['cuda']
 313     if resolved_cuda.nil? or resolved_cuda['device_count'] == 0
 314       runtime_constraint_variations[:cuda] = [
 315         # Check for constraints without cuda
 316         # (containers that predate the constraint)
 317         nil,
 318         # The default "don't need CUDA" value
 319         {
 320           'device_count' => 0,
 321           'driver_version' => '',
 322           'hardware_capability' => '',
 323         },
 324         # The requested value
 325         resolved_runtime_constraints.delete('cuda')
 326       ].uniq
 327     end
 328     reusable_runtime_constraints = hash_product(**runtime_constraint_variations)
 329                                      .map { |v| resolved_runtime_constraints.merge(v) }
 330
 331     candidates = candidates.where_serialized(:runtime_constraints, reusable_runtime_constraints, md5: true, multivalue: true)
 332     log_reuse_info(candidates) { "after filtering on runtime_constraints #{attrs[:runtime_constraints].inspect}" }
 333
 334     log_reuse_info { "checking for state=Complete with readable output and log..." }
 335
 336     select_readable_pdh = Collection.
 337       readable_by(current_user).
 338       select(:portable_data_hash).
 339       to_sql
 340
 341     usable = candidates.where(state: Complete, exit_code: 0)
 342     log_reuse_info(usable) { "with state=Complete, exit_code=0" }
 343
 344     usable = usable.where("log IN (#{select_readable_pdh})")
 345     log_reuse_info(usable) { "with readable log" }
 346
 347     usable = usable.where("output IN (#{select_readable_pdh})")
 348     log_reuse_info(usable) { "with readable output" }
 349
 350     usable = usable.order('finished_at ASC').limit(1).first
 351     if usable
 352       log_reuse_info { "done, reusing container #{usable.uuid} with state=Complete" }
 353       return usable
 354     end
 355
 356     # Check for non-failing Running candidates and return the most likely to finish sooner.
 357     log_reuse_info { "checking for state=Running..." }
 358     running = candidates.where(state: Running).
 359               where("(runtime_status->'error') is null and priority > 0").
 360               order('progress desc, started_at asc').
 361               limit(1).first
 362     if running
 363       log_reuse_info { "done, reusing container #{running.uuid} with state=Running" }
 364       return running
 365     else
 366       log_reuse_info { "have no containers in Running state" }
 367     end
 368
 369     # Check for Locked or Queued ones and return the most likely to start first.
 370     locked_or_queued = candidates.
 371                        where("state IN (?)", [Locked, Queued]).
 372                        order('state asc, priority desc, created_at asc').
 373                        limit(1)
 374     if !attrs[:scheduling_parameters]['preemptible']
 375       locked_or_queued = locked_or_queued.
 376                            where("not ((scheduling_parameters::jsonb)->>'preemptible')::boolean")
 377     end
 378     chosen = locked_or_queued.first
 379     if chosen
 380       log_reuse_info { "done, reusing container #{chosen.uuid} with state=#{chosen.state}" }
 381       return chosen
 382     else
 383       log_reuse_info { "have no containers in Locked or Queued state" }
 384     end
 385
 386     log_reuse_info { "done, no reusable container found" }
 387     nil
 388   end
 389
 390   def lock
 391     self.with_lock do
 392       if self.state != Queued
 393         raise LockFailedError.new("cannot lock when #{self.state}")
 394       end
 395       self.update!(state: Locked)
 396     end
 397   end
 398
 399   def check_lock
 400     if state_was == Queued and state == Locked
 401       if self.priority <= 0
 402         raise LockFailedError.new("cannot lock when priority<=0")
 403       end
 404       self.lock_count = self.lock_count+1
 405     end
 406   end
 407
 408   def unlock
 409     self.with_lock do
 410       if self.state != Locked
 411         raise InvalidStateTransitionError.new("cannot unlock when #{self.state}")
 412       end
 413       self.update!(state: Queued)
 414     end
 415   end
 416
 417   def check_unlock
 418     if state_was == Locked and state == Queued
 419       if self.locked_by_uuid != current_api_client_authorization.uuid
 420         raise ArvadosModel::PermissionDeniedError.new("locked by a different token")
 421       end
 422       if self.lock_count >= Rails.configuration.Containers.MaxDispatchAttempts
 423         self.state = Cancelled
 424         self.runtime_status = {error: "Failed to start container.  Cancelled after exceeding 'Containers.MaxDispatchAttempts' (lock_count=#{self.lock_count})"}
 425       end
 426     end
 427   end
 428
 429   def self.readable_by(*users_list)
 430     # Load optional keyword arguments, if they exist.
 431     if users_list.last.is_a? Hash
 432       kwargs = users_list.pop
 433     else
 434       kwargs = {}
 435     end
 436     if users_list.select { |u| u.is_admin }.any?
 437       return super
 438     end
 439     Container.where(ContainerRequest.readable_by(*users_list).where("containers.uuid = container_requests.container_uuid").arel.exists)
 440   end
 441
 442   def final?
 443     [Complete, Cancelled].include?(self.state)
 444   end
 445
 446   def self.for_current_token
 447     return if !current_api_client_authorization
 448     _, _, _, container_uuid = Thread.current[:token].split('/')
 449     if container_uuid.nil?
 450       Container.where(auth_uuid: current_api_client_authorization.uuid).first
 451     else
 452       Container.where('auth_uuid=? or (uuid=? and runtime_token=?)',
 453                       current_api_client_authorization.uuid,
 454                       container_uuid,
 455                       current_api_client_authorization.token).first
 456     end
 457   end
 458
 459   protected
 460
 461   def self.bound_keep_cache_disk(value)
 462     value ||= 0
 463     min_value = 2 << 30
 464     max_value = 32 << 30
 465     if value < min_value
 466       min_value
 467     elsif value > max_value
 468       max_value
 469     else
 470       value
 471     end
 472   end
 473
 474   def self.hash_product(**kwargs)
 475     # kwargs is a hash that maps parameters to an array of values.
 476     # This function enumerates every possible hash where each key has one of
 477     # the values from its array.
 478     # The output keys are strings since that's what container hash attributes
 479     # want.
 480     # A nil value yields a hash without that key.
 481     [[:_, nil]].product(
 482       *kwargs.map { |(key, values)| [key.to_s].product(values) },
 483     ).map { |param_pairs| Hash[param_pairs].compact }
 484   end
 485
 486   def fill_field_defaults
 487     self.state ||= Queued
 488     self.environment ||= {}
 489     self.runtime_constraints ||= {}
 490     self.mounts ||= {}
 491     self.output_glob ||= []
 492     self.cwd ||= "."
 493     self.priority ||= 0
 494     self.scheduling_parameters ||= {}
 495   end
 496
 497   def permission_to_create
 498     current_user.andand.is_admin
 499   end
 500
 501   def permission_to_destroy
 502     current_user.andand.is_admin
 503   end
 504
 505   def ensure_owner_uuid_is_permitted
 506     # validate_change ensures owner_uuid can't be changed at all --
 507     # except during create, which requires admin privileges. Checking
 508     # permission here would be superfluous.
 509     true
 510   end
 511
 512   def set_timestamps
 513     if self.state_changed? and self.state == Running
 514       self.started_at ||= db_current_time
 515     end
 516
 517     if self.state_changed? and [Complete, Cancelled].include? self.state
 518       self.finished_at ||= db_current_time
 519     end
 520   end
 521
 522   # Check that well-known runtime status keys have desired data types
 523   def validate_runtime_status
 524     [
 525       'error', 'errorDetail', 'warning', 'warningDetail', 'activity'
 526     ].each do |k|
 527       if self.runtime_status.andand.include?(k) && !self.runtime_status[k].is_a?(String)
 528         errors.add(:runtime_status, "'#{k}' value must be a string")
 529       end
 530     end
 531   end
 532
 533   def validate_change
 534     permitted = [:state]
 535     final_attrs = [:finished_at]
 536     progress_attrs = [:progress, :runtime_status, :subrequests_cost, :cost,
 537                       :log, :output, :output_properties, :exit_code]
 538
 539     if self.new_record?
 540       permitted.push(:owner_uuid, :command, :container_image, :cwd,
 541                      :environment, :mounts, :output_path, :output_glob,
 542                      :priority, :runtime_constraints,
 543                      :scheduling_parameters, :secret_mounts,
 544                      :runtime_token, :runtime_user_uuid,
 545                      :runtime_auth_scopes, :output_storage_classes)
 546     end
 547
 548     case self.state
 549     when Locked
 550       permitted.push :priority, :runtime_status, :log, :lock_count
 551
 552     when Queued
 553       permitted.push :priority
 554
 555     when Running
 556       permitted.push :priority, :output_properties, :gateway_address, *progress_attrs
 557       if self.state_changed?
 558         permitted.push :started_at
 559       end
 560       if !self.interactive_session_started_was
 561         permitted.push :interactive_session_started
 562       end
 563
 564     when Complete
 565       if self.state_was == Running
 566         permitted.push *final_attrs, *progress_attrs
 567       end
 568
 569     when Cancelled
 570       case self.state_was
 571       when Running
 572         permitted.push :finished_at, *progress_attrs
 573       when Queued, Locked
 574         permitted.push :finished_at, :log, :runtime_status, :cost
 575       end
 576
 577     else
 578       # The state_transitions check will add an error message for this
 579       return false
 580     end
 581
 582     if self.state_was == Running &&
 583        !current_api_client_authorization.nil? &&
 584        (current_api_client_authorization.uuid == self.auth_uuid ||
 585         current_api_client_authorization.token == self.runtime_token)
 586       # The contained process itself can write final attrs but can't
 587       # change priority or log.
 588       permitted.push *final_attrs
 589       permitted = permitted - [:log, :priority]
 590     elsif !current_user.andand.is_admin
 591       raise PermissionDeniedError
 592     elsif self.locked_by_uuid && self.locked_by_uuid != current_api_client_authorization.andand.uuid
 593       # When locked, progress fields cannot be updated by the wrong
 594       # dispatcher, even though it has admin privileges.
 595       permitted = permitted - progress_attrs
 596     end
 597     check_update_whitelist permitted
 598   end
 599
 600   def validate_lock
 601     if [Locked, Running].include? self.state
 602       # If the Container was already locked, locked_by_uuid must not
 603       # changes. Otherwise, the current auth gets the lock.
 604       need_lock = locked_by_uuid_was || current_api_client_authorization.andand.uuid
 605     else
 606       need_lock = nil
 607     end
 608
 609     # The caller can provide a new value for locked_by_uuid, but only
 610     # if it's exactly what we expect. This allows a caller to perform
 611     # an update like {"state":"Unlocked","locked_by_uuid":null}.
 612     if self.locked_by_uuid_changed?
 613       if self.locked_by_uuid != need_lock
 614         return errors.add :locked_by_uuid, "can only change to #{need_lock}"
 615       end
 616     end
 617     self.locked_by_uuid = need_lock
 618   end
 619
 620   def validate_output
 621     # Output must exist and be readable by the current user.  This is so
 622     # that a container cannot "claim" a collection that it doesn't otherwise
 623     # have access to just by setting the output field to the collection PDH.
 624     if output_changed?
 625       c = Collection.
 626             readable_by(current_user, {include_trash: true}).
 627             where(portable_data_hash: self.output).
 628             first
 629       if !c
 630         errors.add :output, "collection must exist and be readable by current user."
 631       end
 632     end
 633   end
 634
 635   def update_cr_logs
 636     # If self.final?, this update is superfluous: the final log/output
 637     # update will be done when handle_completed calls finalize! on
 638     # each requesting CR.
 639     return if self.final? || !saved_change_to_log?
 640     leave_modified_by_user_alone do
 641       ContainerRequest.where(container_uuid: self.uuid, state: ContainerRequest::Committed).each do |cr|
 642         cr.update_collections(container: self, collections: ['log'])
 643         cr.save!
 644       end
 645     end
 646   end
 647
 648   def assign_auth
 649     if self.auth_uuid_changed?
 650          return errors.add :auth_uuid, 'is readonly'
 651     end
 652     if not [Locked, Running].include? self.state
 653       # Don't need one. If auth already exists, expire it.
 654       #
 655       # We use db_transaction_time here (not db_current_time) to
 656       # ensure the token doesn't validate later in the same
 657       # transaction (e.g., in a test case) by satisfying expires_at >
 658       # transaction timestamp.
 659       self.auth.andand.update(expires_at: db_transaction_time)
 660       self.auth = nil
 661       return
 662     elsif self.auth
 663       # already have one
 664       return
 665     end
 666     if self.runtime_token.nil?
 667       if self.runtime_user_uuid.nil?
 668         # legacy behavior, we don't have a runtime_user_uuid so get
 669         # the user from the highest priority container request, needed
 670         # when performing an upgrade and there are queued containers,
 671         # and some tests.
 672         cr = ContainerRequest.
 673                where('container_uuid=? and priority>0', self.uuid).
 674                order('priority desc').
 675                first
 676         if !cr
 677           return errors.add :auth_uuid, "cannot be assigned because priority <= 0"
 678         end
 679         self.runtime_user_uuid = cr.modified_by_user_uuid
 680         self.runtime_auth_scopes = ["all"]
 681       end
 682
 683       # Generate a new token. This runs with admin credentials as it's done by a
 684       # dispatcher user, so expires_at isn't enforced by API.MaxTokenLifetime.
 685       self.auth = ApiClientAuthorization.
 686                     create!(user_id: User.find_by_uuid(self.runtime_user_uuid).id,
 687                             scopes: self.runtime_auth_scopes)
 688     end
 689   end
 690
 691   def sort_serialized_attrs
 692     if self.environment_changed?
 693       self.environment = self.class.deep_sort_hash(self.environment)
 694     end
 695     if self.mounts_changed?
 696       self.mounts = self.class.deep_sort_hash(self.mounts)
 697     end
 698     if self.runtime_constraints_changed?
 699       self.runtime_constraints = self.class.deep_sort_hash(self.runtime_constraints)
 700     end
 701     if self.scheduling_parameters_changed?
 702       self.scheduling_parameters = self.class.deep_sort_hash(self.scheduling_parameters)
 703     end
 704     if self.runtime_auth_scopes_changed?
 705       self.runtime_auth_scopes = self.runtime_auth_scopes.sort
 706     end
 707   end
 708
 709   def update_secret_mounts_md5
 710     if self.secret_mounts_changed?
 711       self.secret_mounts_md5 = Digest::MD5.hexdigest(
 712         SafeJSON.dump(self.class.deep_sort_hash(self.secret_mounts)))
 713     end
 714   end
 715
 716   def scrub_secrets
 717     # this runs after update_secret_mounts_md5, so the
 718     # secret_mounts_md5 will still reflect the secrets that are being
 719     # scrubbed here.
 720     if self.state_changed? && self.final?
 721       self.secret_mounts = {}
 722       self.runtime_token = nil
 723     end
 724   end
 725
 726   def clear_runtime_status_when_queued
 727     # Avoid leaking status messages between different dispatch attempts
 728     if self.state_was == Locked && self.state == Queued
 729       self.runtime_status = {}
 730     end
 731   end
 732
 733   def handle_completed
 734     # This container is finished so finalize any associated container requests
 735     # that are associated with this container.
 736     if saved_change_to_state? and self.final?
 737       # These get wiped out by with_lock (which reloads the record),
 738       # so record them now in case we need to schedule a retry.
 739       prev_secret_mounts = secret_mounts_before_last_save
 740       prev_runtime_token = runtime_token_before_last_save
 741
 742       # Need to take a lock on the container to ensure that any
 743       # concurrent container requests that might try to reuse this
 744       # container will block until the container completion
 745       # transaction finishes.  This ensure that concurrent container
 746       # requests that try to reuse this container are finalized (on
 747       # Complete) or don't reuse it (on Cancelled).
 748       self.with_lock do
 749         act_as_system_user do
 750           if self.state == Cancelled
 751             # Cancelled means the container didn't run to completion.
 752             # This happens either because it was cancelled by the user
 753             # or because there was an infrastructure failure.  We want
 754             # to retry infrastructure failures automatically.
 755             #
 756             # Seach for live container requests to determine if we
 757             # should retry the container.
 758             retryable_requests = ContainerRequest.
 759                                    joins('left outer join containers as requesting_container on container_requests.requesting_container_uuid = requesting_container.uuid').
 760                                    where("container_requests.container_uuid = ? and "+
 761                                          "container_requests.priority > 0 and "+
 762                                          "container_requests.owner_uuid not in (select group_uuid from trashed_groups) and "+
 763                                          "(requesting_container.priority is null or (requesting_container.state = 'Running' and requesting_container.priority > 0)) and "+
 764                                          "container_requests.state = 'Committed' and "+
 765                                          "container_requests.container_count < container_requests.container_count_max", uuid).
 766                                    order('container_requests.uuid asc')
 767           else
 768             retryable_requests = []
 769           end
 770
 771           if retryable_requests.any?
 772             scheduling_parameters = {
 773               # partitions: empty if any are empty, else the union of all parameters
 774               "partitions": retryable_requests
 775                               .map { |req| req.scheduling_parameters["partitions"] || [] }
 776                               .reduce { |cur, new| (cur.empty? or new.empty?) ? [] : (cur | new) },
 777
 778               # preemptible: true if all are true, else false
 779               "preemptible": retryable_requests
 780                                .map { |req| req.scheduling_parameters["preemptible"] }
 781                                .all?,
 782
 783               # supervisor: true if all any true, else false
 784               "supervisor": retryable_requests
 785                                .map { |req| req.scheduling_parameters["supervisor"] }
 786                                .any?,
 787
 788               # max_run_time: 0 if any are 0 (unlimited), else the maximum
 789               "max_run_time": retryable_requests
 790                                 .map { |req| req.scheduling_parameters["max_run_time"] || 0 }
 791                                 .reduce do |cur, new|
 792                 if cur == 0 or new == 0
 793                   0
 794                 elsif new > cur
 795                   new
 796                 else
 797                   cur
 798                 end
 799               end,
 800             }
 801
 802             c_attrs = {
 803               command: self.command,
 804               cwd: self.cwd,
 805               environment: self.environment,
 806               output_path: self.output_path,
 807               output_glob: self.output_glob,
 808               container_image: self.container_image,
 809               mounts: self.mounts,
 810               runtime_constraints: self.runtime_constraints,
 811               scheduling_parameters: scheduling_parameters,
 812               secret_mounts: prev_secret_mounts,
 813               runtime_token: prev_runtime_token,
 814               runtime_user_uuid: self.runtime_user_uuid,
 815               runtime_auth_scopes: self.runtime_auth_scopes
 816             }
 817             c = Container.create! c_attrs
 818             retryable_requests.each do |cr|
 819               cr.with_lock do
 820                 leave_modified_by_user_alone do
 821                   # Use row locking because this increments container_count
 822                   cr.cumulative_cost += self.cost + self.subrequests_cost
 823                   cr.container_uuid = c.uuid
 824                   cr.save!
 825                 end
 826               end
 827             end
 828           end
 829
 830           # Notify container requests associated with this container
 831           ContainerRequest.where(container_uuid: uuid,
 832                                  state: ContainerRequest::Committed).each do |cr|
 833             leave_modified_by_user_alone do
 834               cr.finalize!
 835             end
 836           end
 837
 838           # Cancel outstanding container requests made by this container.
 839           ContainerRequest.
 840             where(requesting_container_uuid: uuid,
 841                   state: ContainerRequest::Committed).
 842             in_batches(of: 15).each_record do |cr|
 843             leave_modified_by_user_alone do
 844               cr.set_priority_zero
 845               container_state = Container.where(uuid: cr.container_uuid).pluck(:state).first
 846               if container_state == Container::Queued || container_state == Container::Locked
 847                 # If the child container hasn't started yet, finalize the
 848                 # child CR now instead of leaving it "on hold", i.e.,
 849                 # Queued with priority 0.  (OTOH, if the child is already
 850                 # running, leave it alone so it can get cancelled the
 851                 # usual way, get a copy of the log collection, etc.)
 852                 cr.update!(state: ContainerRequest::Final)
 853               end
 854             end
 855           end
 856         end
 857       end
 858     end
 859   end
 860 end