Class: Delayed::Backend::ActiveRecord::Job
Overview
A job object that is persisted to the database. Contains the work object as a YAML field.
Direct Known Subclasses
Failed
Defined Under Namespace
Classes: Failed
Constant Summary
Constants included
from Base
Base::ON_HOLD_BLOCKER, Base::ON_HOLD_COUNT, Base::ON_HOLD_LOCKED_BY
Class Method Summary
collapse
-
.advisory_lock(lock_name) ⇒ Object
-
.all_available(queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil, forced_latency: nil) ⇒ Object
-
.apply_temp_strand!(job_scope, max_concurrent: 1) ⇒ Object
given a scope of non-stranded queued jobs, apply a temporary strand to throttle their execution returns [job_count, new_strand] (this is designed for use in a Rails console or the Canvas Jobs interface).
-
.attempt_advisory_lock(lock_name) ⇒ Object
-
.bulk_update(action, opts) ⇒ Object
perform a bulk update of a set of jobs action is :hold, :unhold, or :destroy to specify the jobs to act on, either pass opts = [list of job ids] or opts = <some flavor> to perform on all jobs of that flavor.
-
.by_priority ⇒ Object
-
.clear_locks!(worker_name) ⇒ Object
When a worker is exiting, make sure we don’t have any locked jobs.
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.create(attributes, &block) ⇒ Object
-
.create_singleton(options) ⇒ Object
Create the job on the specified strand, but only if there aren’t any other non-running jobs on that strand.
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.current ⇒ Object
-
.failed ⇒ Object
-
.find_available(limit, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
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.future ⇒ Object
-
.get_and_lock_next_available(worker_names, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil, prefetch: 0, prefetch_owner: nil, forced_latency: nil) ⇒ Object
-
.jobs_count(flavor, query = nil) ⇒ Object
get the total job count for the given flavor see list_jobs for documentation on arguments.
-
.list_jobs(flavor, limit, offset = 0, query = nil) ⇒ Object
get a list of jobs of the given flavor in the given queue flavor is :current, :future, :failed, :strand or :tag depending on the flavor, query has a different meaning: for :current and :future, it’s the queue name (defaults to Delayed::Settings.queue) for :strand it’s the strand name for :tag it’s the tag name for :failed it’s ignored.
-
.maybe_silence_periodic_log(&block) ⇒ Object
-
.n_strand_options(strand_name, num_strands) ⇒ Object
This overwrites the previous behavior so rather than changing the strand and balancing at queue time, this keeps the strand intact and uses triggers to limit the number running.
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.prefetch_jobs_lock_name ⇒ Object
-
.processes_locked_locally(name: nil) ⇒ Object
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.ready_to_run(forced_latency: nil) ⇒ Object
a nice stress test: 10_000.times do |i| Kernel.delay(strand: ‘s1’, run_at: (24.hours.ago + (rand(24.hours.to_i))).system(“echo #i >> test1.txt”) end 500.times { |i| “ohai”.delay(run_at: (12.hours.ago + (rand(24.hours.to_i))).reverse } then fire up your workers you can check out strand correctness: diff test1.txt <(sort -n test1.txt).
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.reconnect! ⇒ Object
-
.running ⇒ Object
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.running_jobs ⇒ Object
-
.scope_for_flavor(flavor, query) ⇒ Object
-
.strand_size(strand) ⇒ Object
-
.tag_counts(flavor, limit, offset = 0) ⇒ Object
returns a list of hashes { :tag => tag_name, :count => current_count } in descending count order flavor is :current or :all.
-
.unlock(jobs) ⇒ Object
-
.unlock_orphaned_prefetched_jobs ⇒ Object
Instance Method Summary
collapse
Methods included from Base
#batch?, #expired?, #failed?, #full_name, #hold!, included, #inferred_max_attempts, #initialize_defaults, #invoke_job, #locked?, #name, #on_hold?, #payload_object, #payload_object=, #permanent_failure, #reschedule, #reschedule_at, #unhold!, #unlock
#encode_with, load_for_delayed_job
Class Method Details
.advisory_lock(lock_name) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 51
def advisory_lock(lock_name)
fn_name = connection.quote_table_name("half_md5_as_bigint")
connection.execute("SELECT pg_advisory_xact_lock(#{fn_name}('#{lock_name}'));")
end
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.all_available(queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil, forced_latency: nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 448
def self.all_available(queue = Delayed::Settings.queue,
min_priority = nil,
max_priority = nil,
forced_latency: nil)
min_priority ||= Delayed::MIN_PRIORITY
max_priority ||= Delayed::MAX_PRIORITY
check_queue(queue)
check_priorities(min_priority, max_priority)
ready_to_run(forced_latency: forced_latency)
.where(priority: min_priority..max_priority, queue: queue)
.by_priority
end
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.apply_temp_strand!(job_scope, max_concurrent: 1) ⇒ Object
given a scope of non-stranded queued jobs, apply a temporary strand to throttle their execution returns [job_count, new_strand] (this is designed for use in a Rails console or the Canvas Jobs interface)
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# File 'lib/delayed/backend/active_record.rb', line 326
def self.apply_temp_strand!(job_scope, max_concurrent: 1)
if job_scope.where("strand IS NOT NULL OR singleton IS NOT NULL").exists?
raise ArgumentError, "can't apply strand to already stranded jobs"
end
job_count = 0
new_strand = "tmp_strand_#{SecureRandom.alphanumeric(16)}"
::Delayed::Job.transaction do
job_count = job_scope.update_all(strand: new_strand, max_concurrent: max_concurrent, next_in_strand: false)
::Delayed::Job.where(strand: new_strand).order(:id).limit(max_concurrent).update_all(next_in_strand: true)
end
[job_count, new_strand]
end
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.attempt_advisory_lock(lock_name) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 46
def attempt_advisory_lock(lock_name)
fn_name = connection.quote_table_name("half_md5_as_bigint")
connection.select_value("SELECT pg_try_advisory_xact_lock(#{fn_name}('#{lock_name}'));")
end
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.bulk_update(action, opts) ⇒ Object
perform a bulk update of a set of jobs action is :hold, :unhold, or :destroy to specify the jobs to act on, either pass opts = [list of job ids] or opts = <some flavor> to perform on all jobs of that flavor
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# File 'lib/delayed/backend/active_record.rb', line 272
def self.bulk_update(action, opts)
raise("Can't #{action} failed jobs") if opts[:flavor].to_s == "failed" && action.to_s != "destroy"
scope = if opts[:ids]
if opts[:flavor] == "failed"
Delayed::Job::Failed.where(id: opts[:ids])
else
where(id: opts[:ids])
end
elsif opts[:flavor]
scope_for_flavor(opts[:flavor], opts[:query])
end
return 0 unless scope
case action.to_s
when "hold"
scope = scope.where(locked_by: nil)
scope.update_all(locked_by: ON_HOLD_LOCKED_BY, locked_at: db_time_now, attempts: ON_HOLD_COUNT)
when "unhold"
now = db_time_now
scope = scope.where(locked_by: ON_HOLD_LOCKED_BY)
scope.update_all([<<~SQL.squish, now, now])
locked_by=NULL, locked_at=NULL, attempts=0, run_at=(CASE WHEN run_at > ? THEN run_at ELSE ? END), failed_at=NULL
SQL
when "destroy"
scope = scope.where("locked_by IS NULL OR locked_by=?", ON_HOLD_LOCKED_BY) unless opts[:flavor] == "failed"
scope.delete_all
end
end
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.by_priority ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 203
def self.by_priority
order(:priority, :run_at, :id)
end
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.clear_locks!(worker_name) ⇒ Object
When a worker is exiting, make sure we don’t have any locked jobs.
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# File 'lib/delayed/backend/active_record.rb', line 208
def self.clear_locks!(worker_name)
where(locked_by: worker_name).update_all(locked_by: nil, locked_at: nil)
end
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.create(attributes, &block) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 39
def create(attributes, &block)
on_conflict = attributes.delete(:on_conflict)
job = new(attributes, &block)
job.single_step_create(on_conflict: on_conflict)
end
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.create_singleton(options) ⇒ Object
Create the job on the specified strand, but only if there aren’t any other non-running jobs on that strand. (in other words, the job will still be created if there’s another job on the strand but it’s already running)
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# File 'lib/delayed/backend/active_record.rb', line 467
def self.create_singleton(options)
strand = options[:singleton]
on_conflict = options.delete(:on_conflict) || :use_earliest
transaction_for_singleton(singleton, on_conflict) do
job = where(strand: strand, locked_at: nil).next_in_strand_order.first
new_job = new(options)
if job
new_job.initialize_defaults
job.run_at =
case on_conflict
when :use_earliest, :patient
[job.run_at, new_job.run_at].min
when :overwrite
new_job.run_at
when :loose
job.run_at
end
job.handler = new_job.handler if on_conflict == :overwrite
job.save! if job.changed?
else
new_job.save!
end
job || new_job
end
end
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.current ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 174
def self.current
where("run_at<=?", db_time_now)
end
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.failed ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 182
def self.failed
where.not(failed_at: nil)
end
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.find_available(limit, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 441
def self.find_available(limit,
queue = Delayed::Settings.queue,
min_priority = nil,
max_priority = nil)
all_available(queue, min_priority, max_priority).limit(limit).to_a
end
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.future ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 178
def self.future
where("run_at>?", db_time_now)
end
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.get_and_lock_next_available(worker_names, queue = Delayed::Settings.queue, min_priority = nil, max_priority = nil, prefetch: 0, prefetch_owner: nil, forced_latency: nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 349
def self.get_and_lock_next_available(worker_names,
queue = Delayed::Settings.queue,
min_priority = nil,
max_priority = nil,
prefetch: 0,
prefetch_owner: nil,
forced_latency: nil)
check_queue(queue)
check_priorities(min_priority, max_priority)
loop do
jobs = maybe_silence_periodic_log do
if connection.adapter_name == "PostgreSQL" && !Settings.select_random_from_batch
effective_worker_names = Array(worker_names)
lock = nil
lock = "FOR UPDATE SKIP LOCKED" if connection.postgresql_version >= 90_500
target_jobs = all_available(queue,
min_priority,
max_priority,
forced_latency: forced_latency)
.limit(effective_worker_names.length + prefetch)
.lock(lock)
jobs_with_row_number = all.from(target_jobs)
.select("id, ROW_NUMBER() OVER () AS row_number")
updates = +"locked_by = CASE row_number "
effective_worker_names.each_with_index do |worker, i|
updates << "WHEN #{i + 1} THEN #{connection.quote(worker)} "
end
updates << "ELSE #{connection.quote(prefetch_owner)} " if prefetch_owner
updates << "END, locked_at = #{connection.quote(db_time_now)}"
query = <<~SQL.squish
WITH limited_jobs AS (#{jobs_with_row_number.to_sql})
UPDATE #{quoted_table_name} SET #{updates} FROM limited_jobs WHERE limited_jobs.id=#{quoted_table_name}.id
RETURNING #{quoted_table_name}.*
SQL
jobs = find_by_sql(query)
return jobs.first unless worker_names.is_a?(Array)
result = jobs.index_by(&:locked_by)
result[prefetch_owner] = jobs.select { |j| j.locked_by == prefetch_owner } if prefetch_owner
return result
else
batch_size = Settings.fetch_batch_size
batch_size *= worker_names.length if worker_names.is_a?(Array)
find_available(batch_size, queue, min_priority, max_priority)
end
end
if jobs.empty?
return worker_names.is_a?(Array) ? {} : nil
end
jobs = jobs.sort_by { rand } if Settings.select_random_from_batch
if worker_names.is_a?(Array)
result = {}
jobs.each do |job|
break if worker_names.empty?
worker_name = worker_names.first
if job.send(:lock_exclusively!, worker_name)
result[worker_name] = job
worker_names.shift
end
end
return result
else
locked_job = jobs.detect do |job|
job.send(:lock_exclusively!, worker_names)
end
return locked_job if locked_job
end
end
end
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.jobs_count(flavor, query = nil) ⇒ Object
get the total job count for the given flavor see list_jobs for documentation on arguments
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# File 'lib/delayed/backend/active_record.rb', line 262
def self.jobs_count(flavor,
query = nil)
scope = scope_for_flavor(flavor, query)
scope.count
end
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.list_jobs(flavor, limit, offset = 0, query = nil) ⇒ Object
get a list of jobs of the given flavor in the given queue flavor is :current, :future, :failed, :strand or :tag depending on the flavor, query has a different meaning: for :current and :future, it’s the queue name (defaults to Delayed::Settings.queue) for :strand it’s the strand name for :tag it’s the tag name for :failed it’s ignored
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# File 'lib/delayed/backend/active_record.rb', line 251
def self.list_jobs(flavor,
limit,
offset = 0,
query = nil)
scope = scope_for_flavor(flavor, query)
order = (flavor.to_s == "future") ? "run_at" : "id desc"
scope.order(order).limit(limit).offset(offset).to_a
end
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.maybe_silence_periodic_log(&block) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 341
def self.maybe_silence_periodic_log(&block)
if Settings.silence_periodic_log
::ActiveRecord::Base.logger.silence(&block)
else
yield
end
end
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.n_strand_options(strand_name, num_strands) ⇒ Object
This overwrites the previous behavior so rather than changing the strand and balancing at queue time, this keeps the strand intact and uses triggers to limit the number running
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# File 'lib/delayed/backend/active_record.rb', line 170
def self.n_strand_options(strand_name, num_strands)
{ strand: strand_name, max_concurrent: num_strands }
end
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.prefetch_jobs_lock_name ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 499
def self.prefetch_jobs_lock_name
"Delayed::Job.unlock_orphaned_prefetched_jobs"
end
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.processes_locked_locally(name: nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 494
def self.processes_locked_locally(name: nil)
name ||= Socket.gethostname rescue x
where("locked_by LIKE ?", "#{name}:%").pluck(:locked_by).map { |locked_by| locked_by.split(":").last.to_i }
end
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.ready_to_run(forced_latency: nil) ⇒ Object
a nice stress test: 10_000.times do |i|
Kernel.delay(strand: 's1', run_at: (24.hours.ago + (rand(24.hours.to_i))).system("echo #{i} >> test1.txt")
end 500.times { |i| “ohai”.delay(run_at: (12.hours.ago + (rand(24.hours.to_i))).reverse } then fire up your workers you can check out strand correctness: diff test1.txt <(sort -n test1.txt)
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# File 'lib/delayed/backend/active_record.rb', line 197
def self.ready_to_run(forced_latency: nil)
now = db_time_now
now -= forced_latency if forced_latency
where("run_at<=? AND locked_at IS NULL AND next_in_strand=?", now, true)
end
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.reconnect! ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 30
def self.reconnect!
if Rails.version < "6.1"
::ActiveRecord::Base.connection_handler.clear_all_connections!
else
::ActiveRecord::Base.connection_handler.clear_all_connections!(nil)
end
end
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.running ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 186
def self.running
where("locked_at IS NOT NULL AND locked_by<>'on hold'")
end
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.running_jobs ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 216
def self.running_jobs
running.order(:locked_at)
end
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.scope_for_flavor(flavor, query) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 220
def self.scope_for_flavor(flavor, query)
scope = case flavor.to_s
when "current"
current
when "future"
future
when "failed"
Delayed::Job::Failed
when "strand"
where(strand: query)
when "tag"
where(tag: query)
else
raise ArgumentError, "invalid flavor: #{flavor.inspect}"
end
if %w[current future].include?(flavor.to_s)
queue = query.presence || Delayed::Settings.queue
scope = scope.where(queue: queue)
end
scope
end
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.strand_size(strand) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 212
def self.strand_size(strand)
where(strand: strand).count
end
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.tag_counts(flavor, limit, offset = 0) ⇒ Object
returns a list of hashes { :tag => tag_name, :count => current_count } in descending count order flavor is :current or :all
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# File 'lib/delayed/backend/active_record.rb', line 307
def self.tag_counts(flavor,
limit,
offset = 0)
raise(ArgumentError, "invalid flavor: #{flavor}") unless %w[current all].include?(flavor.to_s)
scope = case flavor.to_s
when "current"
current
when "all"
self
end
scope = scope.group(:tag).offset(offset).limit(limit)
scope.order(Arel.sql("COUNT(tag) DESC")).count.map { |t, c| { tag: t, count: c } }
end
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.unlock(jobs) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 514
def self.unlock(jobs)
unlocked = where(id: jobs).update_all(locked_at: nil, locked_by: nil)
jobs.each(&:unlock)
unlocked
end
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.unlock_orphaned_prefetched_jobs ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 503
def self.unlock_orphaned_prefetched_jobs
transaction do
next unless attempt_advisory_lock(prefetch_jobs_lock_name)
horizon = db_time_now - (Settings.parent_process[:prefetched_jobs_timeout] * 4)
where("locked_by LIKE 'prefetch:%' AND locked_at<?", horizon).update_all(locked_at: nil, locked_by: nil)
end
end
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Instance Method Details
#create_and_lock!(worker) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 566
def create_and_lock!(worker)
raise "job already exists" unless new_record?
if singleton
single_step_create
lock_exclusively!(worker)
return
end
self.locked_at = Delayed::Job.db_time_now
self.locked_by = worker
single_step_create
end
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#destroy ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 138
def destroy
destroy_row
end
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#fail! ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 582
def fail!
attrs = attributes
attrs["original_job_id"] = attrs.delete("id") if Failed.columns_hash.key?("original_job_id")
attrs["failed_at"] ||= self.class.db_time_now
attrs.delete("next_in_strand")
attrs.delete("max_concurrent")
self.class.transaction do
failed_job = Failed.create(attrs)
destroy
failed_job
end
rescue
destroy
raise
end
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#lock_strand_on_create ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 159
def lock_strand_on_create
return unless strand.present? && instance_of?(Job)
fn_name = self.class.connection.quote_table_name("half_md5_as_bigint")
quoted_strand_name = self.class.connection.quote(strand)
self.class.connection.execute("SELECT pg_advisory_xact_lock(#{fn_name}(#{quoted_strand_name}))")
end
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#single_step_create(on_conflict: nil) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 57
def single_step_create(on_conflict: nil)
connection = self.class.connection
initialize_defaults
current_time = current_time_from_proper_timezone
all_timestamp_attributes_in_model.each do |column|
_write_attribute(column, current_time) unless attribute_present?(column)
end
attribute_names = if Rails.version < "7.0"
attribute_names_for_partial_writes
else
attribute_names_for_partial_inserts
end
attribute_names = attributes_for_create(attribute_names)
values = attributes_with_values(attribute_names)
im = if Rails.version < "7.0"
self.class.arel_table.compile_insert(self.class.send(:_substitute_values, values))
else
im = Arel::InsertManager.new(self.class.arel_table)
im.insert(values.transform_keys { |name| self.class.arel_table[name] })
im
end
lock_and_insert = values["strand"] && instance_of?(Job)
sql, binds = if lock_and_insert
connection.unprepared_statement do
connection.send(:to_sql_and_binds, im)
end
else
connection.send(:to_sql_and_binds, im)
end
sql = +sql
if singleton && instance_of?(Job)
sql << " ON CONFLICT (singleton) WHERE singleton IS NOT NULL AND locked_by IS NULL DO "
sql << case on_conflict
when :patient, :loose
"NOTHING"
when :overwrite
"UPDATE SET run_at=EXCLUDED.run_at, handler=EXCLUDED.handler"
else "UPDATE SET run_at=EXCLUDED.run_at WHERE EXCLUDED.run_at<delayed_jobs.run_at"
end
end
sql << " RETURNING id"
if lock_and_insert
if values["strand"] && instance_of?(Job)
fn_name = connection.quote_table_name("half_md5_as_bigint")
quoted_strand = connection.quote((Rails.version < "7.0") ? values["strand"] : values["strand"].value)
sql = "SELECT pg_advisory_xact_lock(#{fn_name}(#{quoted_strand})); #{sql}"
end
result = connection.execute(sql, "#{self.class} Create")
self.id = result.values.first&.first
result.clear
else
result = connection.exec_query(sql, "#{self.class} Create", binds)
self.id = connection.send(:last_inserted_id, result)
end
if id
@new_record = false
changes_applied
end
self
end
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#transfer_lock!(from:, to:) ⇒ Object
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# File 'lib/delayed/backend/active_record.rb', line 540
def transfer_lock!(from:, to:)
now = self.class.db_time_now
affected_rows = self.class.where(id: self, locked_by: from).update_all(locked_at: now, locked_by: to)
if affected_rows == 1
mark_as_locked!(now, to)
true
else
false
end
end
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