+ rc
+ end
+
+ # Return a mounts hash suitable for a Container, i.e., with every
+ # readonly collection UUID resolved to a PDH.
+ def self.resolve_mounts(mounts)
+ c_mounts = {}
+ mounts.each do |k, mount|
+ mount = mount.dup
+ c_mounts[k] = mount
+ if mount['kind'] != 'collection'
+ next
+ end
+ if (uuid = mount.delete 'uuid')
+ c = Collection.
+ readable_by(current_user).
+ where(uuid: uuid).
+ select(:portable_data_hash).
+ first
+ if !c
+ raise ArvadosModel::UnresolvableContainerError.new "cannot mount collection #{uuid.inspect}: not found"
+ end
+ if mount['portable_data_hash'].nil?
+ # PDH not supplied by client
+ mount['portable_data_hash'] = c.portable_data_hash
+ elsif mount['portable_data_hash'] != c.portable_data_hash
+ # UUID and PDH supplied by client, but they don't agree
+ raise ArgumentError.new "cannot mount collection #{uuid.inspect}: current portable_data_hash #{c.portable_data_hash.inspect} does not match #{c['portable_data_hash'].inspect} in request"
+ end
+ end
+ end
+ return c_mounts
+ end
+
+ # Return a container_image PDH suitable for a Container.
+ def self.resolve_container_image(container_image)
+ coll = Collection.for_latest_docker_image(container_image)
+ if !coll
+ raise ArvadosModel::UnresolvableContainerError.new "docker image #{container_image.inspect} not found"
+ end
+ coll.portable_data_hash
+ end
+
+ def self.find_reusable(attrs)
+ log_reuse_info { "starting with #{Container.all.count} container records in database" }
+ candidates = Container.where_serialized(:command, attrs[:command])
+ log_reuse_info(candidates) { "after filtering on command #{attrs[:command].inspect}" }
+
+ candidates = candidates.where('cwd = ?', attrs[:cwd])
+ log_reuse_info(candidates) { "after filtering on cwd #{attrs[:cwd].inspect}" }
+
+ candidates = candidates.where_serialized(:environment, attrs[:environment])
+ log_reuse_info(candidates) { "after filtering on environment #{attrs[:environment].inspect}" }
+
+ candidates = candidates.where('output_path = ?', attrs[:output_path])
+ log_reuse_info(candidates) { "after filtering on output_path #{attrs[:output_path].inspect}" }
+
+ image = resolve_container_image(attrs[:container_image])
+ candidates = candidates.where('container_image = ?', image)
+ log_reuse_info(candidates) { "after filtering on container_image #{image.inspect} (resolved from #{attrs[:container_image].inspect})" }
+
+ candidates = candidates.where_serialized(:mounts, resolve_mounts(attrs[:mounts]))
+ log_reuse_info(candidates) { "after filtering on mounts #{attrs[:mounts].inspect}" }
+
+ candidates = candidates.where('secret_mounts_md5 = ?', Digest::MD5.hexdigest(SafeJSON.dump(self.deep_sort_hash(attrs[:secret_mounts]))))
+ log_reuse_info(candidates) { "after filtering on mounts #{attrs[:mounts].inspect}" }
+
+ candidates = candidates.where_serialized(:runtime_constraints, resolve_runtime_constraints(attrs[:runtime_constraints]))
+ log_reuse_info(candidates) { "after filtering on runtime_constraints #{attrs[:runtime_constraints].inspect}" }
+
+ log_reuse_info { "checking for state=Complete with readable output and log..." }
+
+ select_readable_pdh = Collection.
+ readable_by(current_user).
+ select(:portable_data_hash).
+ to_sql
+
+ usable = candidates.where(state: Complete, exit_code: 0)
+ log_reuse_info(usable) { "with state=Complete, exit_code=0" }
+
+ usable = usable.where("log IN (#{select_readable_pdh})")
+ log_reuse_info(usable) { "with readable log" }
+
+ usable = usable.where("output IN (#{select_readable_pdh})")
+ log_reuse_info(usable) { "with readable output" }
+
+ usable = usable.order('finished_at ASC').limit(1).first
+ if usable
+ log_reuse_info { "done, reusing container #{usable.uuid} with state=Complete" }
+ return usable
+ end
+
+ # Check for Running candidates and return the most likely to finish sooner.
+ log_reuse_info { "checking for state=Running..." }
+ running = candidates.where(state: Running).
+ order('progress desc, started_at asc').
+ limit(1).first
+ if running
+ log_reuse_info { "done, reusing container #{running.uuid} with state=Running" }
+ return running
+ else
+ log_reuse_info { "have no containers in Running state" }
+ end
+
+ # 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
+ if locked_or_queued
+ log_reuse_info { "done, reusing container #{locked_or_queued.uuid} with state=#{locked_or_queued.state}" }
+ return locked_or_queued
+ else
+ log_reuse_info { "have no containers in Locked or Queued state" }
+ end
+
+ log_reuse_info { "done, no reusable container found" }
+ nil
+ end
+
+ def check_lock_fail
+ if self.state != Queued
+ raise LockFailedError.new("cannot lock when #{self.state}")
+ elsif self.priority <= 0
+ raise LockFailedError.new("cannot lock when priority<=0")
+ end
+ end
+
+ def lock
+ # Check invalid state transitions once before getting the lock
+ # (because it's cheaper that way) and once after getting the lock
+ # (because state might have changed while acquiring the lock).
+ check_lock_fail
+ transaction do
+ begin
+ reload(lock: 'FOR UPDATE NOWAIT')
+ rescue
+ raise LockFailedError.new("cannot lock: other transaction in progress")
+ end
+ check_lock_fail
+ update_attributes!(state: Locked)
+ end
+ end
+
+ def check_unlock_fail
+ if self.state != Locked
+ raise InvalidStateTransitionError.new("cannot unlock when #{self.state}")
+ elsif self.locked_by_uuid != current_api_client_authorization.uuid
+ raise InvalidStateTransitionError.new("locked by a different token")
+ end
+ end
+
+ def unlock
+ # Check invalid state transitions twice (see lock)
+ check_unlock_fail
+ transaction do
+ reload(lock: 'FOR UPDATE')
+ check_unlock_fail
+ update_attributes!(state: Queued)
+ end
+ end
+
+ def self.readable_by(*users_list)
+ # Load optional keyword arguments, if they exist.
+ if users_list.last.is_a? Hash
+ kwargs = users_list.pop
+ else
+ kwargs = {}
+ end
+ Container.where(ContainerRequest.readable_by(*users_list).where("containers.uuid = container_requests.container_uuid").exists)
+ end
+
+ def final?
+ [Complete, Cancelled].include?(self.state)