+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
+require 'log_reuse_info'
require 'whitelist_update'
+require 'safe_json'
class Container < ArvadosModel
include HasUuid
include CommonApiTemplate
include WhitelistUpdate
extend CurrentApiClient
+ extend DbCurrentTime
+ extend LogReuseInfo
serialize :environment, Hash
serialize :mounts, Hash
Running => [Complete, Cancelled]
}
+ def self.limit_index_columns_read
+ ["mounts"]
+ end
+
def state_transitions
State_transitions
end
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 had consistent outputs.
- completed = candidates.where(state: Complete).where(exit_code: 0)
- outputs = completed.select('output').group('output').limit(2)
- if outputs.count.count != 1
- Rails.logger.debug("Found #{outputs.count.length} different outputs")
- elsif Collection.
- readable_by(current_user).
- where(portable_data_hash: outputs.first.output).
- count < 1
- Rails.logger.info("Found reusable container(s) " +
- "but output #{outputs.first} is not readable " +
- "by user #{current_user.uuid}")
- else
- # Return the oldest eligible container whose log is still
- # present and readable by current_user.
- readable_pdh = Collection.
- readable_by(current_user).
- select('portable_data_hash')
- completed = completed.
- where("log in (#{readable_pdh.to_sql})").
- order('finished_at asc').
- limit(1)
- if completed.first
- return completed.first
+ # Create a new container (or find an existing one) to satisfy the
+ # given container request.
+ def self.resolve(req)
+ c_attrs = {
+ command: req.command,
+ cwd: req.cwd,
+ environment: req.environment,
+ output_path: req.output_path,
+ container_image: resolve_container_image(req.container_image),
+ mounts: resolve_mounts(req.mounts),
+ runtime_constraints: resolve_runtime_constraints(req.runtime_constraints),
+ scheduling_parameters: req.scheduling_parameters,
+ }
+ act_as_system_user do
+ if req.use_existing && (reusable = find_reusable(c_attrs))
+ reusable
+ else
+ Container.create!(c_attrs)
+ end
+ end
+ end
+
+ # Return a runtime_constraints hash that complies with requested but
+ # is suitable for saving in a container record, i.e., has specific
+ # values instead of ranges.
+ #
+ # Doing this as a step separate from other resolutions, like "git
+ # revision range to commit hash", makes sense only when there is no
+ # opportunity to reuse an existing container (e.g., container reuse
+ # is not implemented yet, or we have already found that no existing
+ # containers are suitable).
+ def self.resolve_runtime_constraints(runtime_constraints)
+ rc = {}
+ defaults = {
+ 'keep_cache_ram' =>
+ Rails.configuration.container_default_keep_cache_ram,
+ }
+ defaults.merge(runtime_constraints).each do |k, v|
+ if v.is_a? Array
+ rc[k] = v[0]
else
- Rails.logger.info("Found reusable container(s) but none with a log " +
- "readable by user #{current_user.uuid}")
+ rc[k] = v
+ end
+ end
+ 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_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
- return running if not running.nil?
+ 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
- return locked_or_queued if not locked_or_queued.nil?
+ 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
- # No suitable candidate found.
+ 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
- with_lock do
- if self.state == Locked
- raise AlreadyLockedError
+ # 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
- self.state = Locked
- self.save!
+ 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
- with_lock do
- if self.state == Queued
- raise InvalidStateTransitionError
- end
- self.state = Queued
- self.save!
+ # 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
# that a container cannot "claim" a collection that it doesn't otherwise
# have access to just by setting the output field to the collection PDH.
if output_changed?
- c = Collection.
- readable_by(current_user).
- where(portable_data_hash: self.output).
- first
+ c = Collection.unscoped do
+ Collection.
+ readable_by(current_user).
+ where(portable_data_hash: self.output).
+ first
+ end
if !c
errors.add :output, "collection must exist and be readable by current user."
end
act_as_system_user do
if self.state == Cancelled
- retryable_requests = ContainerRequest.where("priority > 0 and state = 'Committed' and container_count < container_count_max")
+ retryable_requests = ContainerRequest.where("container_uuid = ? and priority > 0 and state = 'Committed' and container_count < container_count_max", uuid)
else
retryable_requests = []
end
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