X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/2858d8075d2178fa252af4e585687855e3b30dc2..3fb81a4db7abbaaa67b7a18d1c4a5ce82bc232dc:/services/api/app/models/container.rb

diff --git a/services/api/app/models/container.rb b/services/api/app/models/container.rb
index 2e8bfff2e6..c1c3eae94b 100644
--- a/services/api/app/models/container.rb
+++ b/services/api/app/models/container.rb
@@ -1,14 +1,37 @@
+require 'whitelist_update'
+
 class Container < ArvadosModel
   include HasUuid
   include KindAndEtag
   include CommonApiTemplate
+  include WhitelistUpdate
+
+  serialize :environment, Hash
+  serialize :mounts, Hash
+  serialize :runtime_constraints, Hash
+  serialize :command, Array
+
+  before_validation :fill_field_defaults, :if => :new_record?
+  before_validation :set_timestamps
+  validates :command, :container_image, :output_path, :cwd, :priority, :presence => true
+  validate :validate_state_change
+  validate :validate_change
+  validate :validate_lock
+  after_validation :assign_auth
+  before_save :sort_serialized_attrs
+  after_save :handle_completed
+
+  has_many :container_requests, :foreign_key => :container_uuid, :class_name => 'ContainerRequest', :primary_key => :uuid
+  belongs_to :auth, :class_name => 'ApiClientAuthorization', :foreign_key => :auth_uuid, :primary_key => :uuid
 
   api_accessible :user, extend: :common do |t|
     t.add :command
     t.add :container_image
     t.add :cwd
     t.add :environment
+    t.add :exit_code
     t.add :finished_at
+    t.add :locked_by_uuid
     t.add :log
     t.add :mounts
     t.add :output
@@ -18,14 +41,261 @@ class Container < ArvadosModel
     t.add :runtime_constraints
     t.add :started_at
     t.add :state
-    t.add :uuid
+    t.add :auth_uuid
   end
 
-  serialize :properties, Hash
-  serialize :environment, Hash
-  serialize :mounts, Hash
-  serialize :runtime_constraints, Hash
-  serialize :command, Array
+  # Supported states for a container
+  States =
+    [
+     (Queued = 'Queued'),
+     (Locked = 'Locked'),
+     (Running = 'Running'),
+     (Complete = 'Complete'),
+     (Cancelled = 'Cancelled')
+    ]
+
+  State_transitions = {
+    nil => [Queued],
+    Queued => [Locked, Cancelled],
+    Locked => [Queued, Running, Cancelled],
+    Running => [Complete, Cancelled]
+  }
+
+  def state_transitions
+    State_transitions
+  end
+
+  def update_priority!
+    if [Queued, Locked, Running].include? self.state
+      # Update the priority of this container to the maximum priority of any of
+      # its committed container requests and save the record.
+      self.priority = ContainerRequest.
+        where(container_uuid: uuid,
+              state: ContainerRequest::Committed).
+        maximum('priority')
+      self.save!
+    end
+  end
+
+  def self.find_reusable(attrs)
+    candidates = Container.
+      where('command = ?', attrs[:command].to_yaml).
+      where('cwd = ?', attrs[:cwd]).
+      where('environment = ?', self.deep_sort_hash(attrs[:environment]).to_yaml).
+      where('output_path = ?', attrs[:output_path]).
+      where('container_image = ?', attrs[:container_image]).
+      where('mounts = ?', self.deep_sort_hash(attrs[:mounts]).to_yaml).
+      where('runtime_constraints = ?', self.deep_sort_hash(attrs[:runtime_constraints]).to_yaml)
+
+    # Check for Completed candidates that only had consistent outputs.
+    completed = candidates.where(state: Complete).where(exit_code: 0)
+    if completed.select("output").group('output').limit(2).length == 1
+      return completed.order('finished_at asc').limit(1).first
+    end
+
+    # Check for Running candidates and return the most likely to finish sooner.
+    running = candidates.where(state: Running).
+      order('progress desc, started_at asc').limit(1).first
+    return running if not running.nil?
+
+    # Check for Locked or Queued ones and return the most likely to start first.
+    locked_or_queued = candidates.where("state IN (?)", [Locked, Queued]).
+      order('state asc, priority desc, created_at asc').limit(1).first
+    return locked_or_queued if not locked_or_queued.nil?
+
+    # No suitable candidate found.
+    nil
+  end
+
+  def lock
+    with_lock do
+      if self.state == Locked
+        raise AlreadyLockedError
+      end
+      self.state = Locked
+      self.save!
+    end
+  end
+
+  def unlock
+    with_lock do
+      if self.state == Queued
+        raise InvalidStateTransitionError
+      end
+      self.state = Queued
+      self.save!
+    end
+  end
+
+  def self.readable_by(*users_list)
+    if users_list.select { |u| u.is_admin }.any?
+      return self
+    end
+    user_uuids = users_list.map { |u| u.uuid }
+    uuid_list = user_uuids + users_list.flat_map { |u| u.groups_i_can(:read) }
+    uuid_list.uniq!
+    permitted = "(SELECT head_uuid FROM links WHERE link_class='permission' AND tail_uuid IN (:uuids))"
+    joins(:container_requests).
+      where("container_requests.uuid IN #{permitted} OR "+
+            "container_requests.owner_uuid IN (:uuids)",
+            uuids: uuid_list)
+  end
+
+  protected
+
+  def fill_field_defaults
+    self.state ||= Queued
+    self.environment ||= {}
+    self.runtime_constraints ||= {}
+    self.mounts ||= {}
+    self.cwd ||= "."
+    self.priority ||= 1
+  end
+
+  def permission_to_create
+    current_user.andand.is_admin
+  end
+
+  def permission_to_update
+    current_user.andand.is_admin
+  end
+
+  def set_timestamps
+    if self.state_changed? and self.state == Running
+      self.started_at ||= db_current_time
+    end
+
+    if self.state_changed? and [Complete, Cancelled].include? self.state
+      self.finished_at ||= db_current_time
+    end
+  end
+
+  def validate_change
+    permitted = [:state]
+
+    if self.new_record?
+      permitted.push(:owner_uuid, :command, :container_image, :cwd,
+                     :environment, :mounts, :output_path, :priority,
+                     :runtime_constraints)
+    end
+
+    case self.state
+    when Queued, Locked
+      permitted.push :priority
+
+    when Running
+      permitted.push :priority, :progress
+      if self.state_changed?
+        permitted.push :started_at
+      end
+
+    when Complete
+      if self.state_was == Running
+        permitted.push :finished_at, :output, :log, :exit_code
+      end
+
+    when Cancelled
+      case self.state_was
+      when Running
+        permitted.push :finished_at, :output, :log
+      when Queued, Locked
+        permitted.push :finished_at
+      end
+
+    else
+      # The state_transitions check will add an error message for this
+      return false
+    end
+
+    check_update_whitelist permitted
+  end
+
+  def validate_lock
+    # If the Container is already locked by someone other than the
+    # current api_client_auth, disallow all changes -- except
+    # priority, which needs to change to reflect max(priority) of
+    # relevant ContainerRequests.
+    if locked_by_uuid_was
+      if locked_by_uuid_was != Thread.current[:api_client_authorization].uuid
+        check_update_whitelist [:priority]
+      end
+    end
+
+    if [Locked, Running].include? self.state
+      # If the Container was already locked, locked_by_uuid must not
+      # changes. Otherwise, the current auth gets the lock.
+      need_lock = locked_by_uuid_was || Thread.current[:api_client_authorization].uuid
+    else
+      need_lock = nil
+    end
+
+    # The caller can provide a new value for locked_by_uuid, but only
+    # if it's exactly what we expect. This allows a caller to perform
+    # an update like {"state":"Unlocked","locked_by_uuid":null}.
+    if self.locked_by_uuid_changed?
+      if self.locked_by_uuid != need_lock
+        return errors.add :locked_by_uuid, "can only change to #{need_lock}"
+      end
+    end
+    self.locked_by_uuid = need_lock
+  end
+
+  def assign_auth
+    if self.auth_uuid_changed?
+      return errors.add :auth_uuid, 'is readonly'
+    end
+    if not [Locked, Running].include? self.state
+      # don't need one
+      self.auth.andand.update_attributes(expires_at: db_current_time)
+      self.auth = nil
+      return
+    elsif self.auth
+      # already have one
+      return
+    end
+    cr = ContainerRequest.
+      where('container_uuid=? and priority>0', self.uuid).
+      order('priority desc').
+      first
+    if !cr
+      return errors.add :auth_uuid, "cannot be assigned because priority <= 0"
+    end
+    self.auth = ApiClientAuthorization.
+      create!(user_id: User.find_by_uuid(cr.modified_by_user_uuid).id,
+              api_client_id: 0)
+  end
+
+  def sort_serialized_attrs
+    if self.environment_changed?
+      self.environment = self.class.deep_sort_hash(self.environment)
+    end
+    if self.mounts_changed?
+      self.mounts = self.class.deep_sort_hash(self.mounts)
+    end
+    if self.runtime_constraints_changed?
+      self.runtime_constraints = self.class.deep_sort_hash(self.runtime_constraints)
+    end
+  end
+
+  def handle_completed
+    # This container is finished so finalize any associated container requests
+    # that are associated with this container.
+    if self.state_changed? and [Complete, Cancelled].include? self.state
+      act_as_system_user do
+        # Notify container requests associated with this container
+        ContainerRequest.where(container_uuid: uuid,
+                               :state => ContainerRequest::Committed).each do |cr|
+          cr.container_completed!
+        end
+
+        # Try to cancel any outstanding container requests made by this container.
+        ContainerRequest.where(requesting_container_uuid: uuid,
+                               :state => ContainerRequest::Committed).each do |cr|
+          cr.priority = 0
+          cr.save
+        end
+      end
+    end
+  end
 
-  has_many :container_requests, :foreign_key => :container_uuid, :class_name => 'ContainerRequest', :primary_key => :uuid
 end