Module: SwitchmanInstJobs::Switchman::Shard::ClassMethods

Defined in:
lib/switchman_inst_jobs/switchman/shard.rb

Instance Method Summary collapse

Instance Method Details

#activate!(categories) ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 106

def activate!(categories)
  if !@skip_delayed_job_auto_activation &&
     !categories[::Delayed::Backend::ActiveRecord::AbstractJob] &&
     categories[::ActiveRecord::Base] &&
     categories[::ActiveRecord::Base] != ::Switchman::Shard.current(::ActiveRecord::Base)
    skip_delayed_job_auto_activation do
      categories[::Delayed::Backend::ActiveRecord::AbstractJob] =
        categories[::ActiveRecord::Base].delayed_jobs_shard
    end
  end
  super
end

#clear_cache ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 101

def clear_cache
  super
  remove_instance_variable(:@delayed_jobs_shards) if instance_variable_defined?(:@delayed_jobs_shards)
end

#delayed_jobs_shards ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 135

def delayed_jobs_shards
  return none unless ::Switchman::Shard.columns_hash.key?("delayed_jobs_shard_id")

  scope = ::Switchman::Shard.unscoped
                            .where(id: ::Switchman::Shard.unscoped
                                                         .distinct
                                                         .where.not(delayed_jobs_shard_id: nil)
                            .select(:delayed_jobs_shard_id))
  db_jobs_shards = ::Switchman::DatabaseServer.all.map { |db| db.config[:delayed_jobs_shard] }.uniq
  db_jobs_shards.delete(nil)
  has_self = db_jobs_shards.delete("self")
  scope = scope.or(::Switchman::Shard.unscoped.where(id: db_jobs_shards)) unless db_jobs_shards.empty?

  if has_self
    self_dbs = ::Switchman::DatabaseServer.select { |db| db.config[:delayed_jobs_shard] == "self" }.map(&:id)
    scope = scope.or(::Switchman::Shard.unscoped
      .where(id: ::Switchman::Shard.unscoped.where(delayed_jobs_shard_id: nil, database_server_id: self_dbs)
      .select(:id)))
  end
  @jobs_scope_empty = !scope.exists? unless instance_variable_defined?(:@jobs_scope_empty)
  return ::Switchman::Shard.where(id: ::Switchman::Shard.default.id) if @jobs_scope_empty

  ::Switchman::Shard.merge(scope)
end

#hold_jobs!(wait: false) ⇒ Object

Adapted from hold/unhold methods in base delayed jobs base Wait is required to be able to safely move jobs



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 35

def hold_jobs!(wait: false)
  shards = all.to_a
  wait_for_caches = false
  shards.each do |shard|
    shard.jobs_held = true
    if shard.changed?
      shard.save!
      wait_for_caches = true if wait
    end
  end
  shards_by_jobs_shard(shards).each do |jobs_shard, shard_ids|
    jobs_shard.activate(::Delayed::Backend::ActiveRecord::AbstractJob) do
      lock_jobs_for_hold(shard_ids)
    end
  end
  return unless wait

  # Wait a little over the 60 second in-process shard cache clearing
  # threshold to ensure that all new jobs are now being enqueued
  # locked
  Rails.logger.debug("Waiting for caches to clear")
  sleep(65) if wait && wait_for_caches

  shards_by_jobs_shard(shards).each do |jobs_shard, shard_ids|
    jobs_shard.activate(::Delayed::Backend::ActiveRecord::AbstractJob) do
      while ::Delayed::Job.where(shard_id: shard_ids)
                          .where.not(locked_at: nil)
                          .where.not(locked_by: ::Delayed::Backend::Base::ON_HOLD_LOCKED_BY).exists?
        sleep 10
        lock_jobs_for_hold(shard_ids)
      end
    end
  end
end

#periodic_clear_shard_cache ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 127

def periodic_clear_shard_cache
  # TODO: make this configurable
  @timed_cache ||= TimedCache.new(-> { 60.seconds.ago }) do
    ::Switchman::Shard.clear_cache
  end
  @timed_cache.clear
end

#skip_delayed_job_auto_activation ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 119

def skip_delayed_job_auto_activation
  was = @skip_delayed_job_auto_activation
  @skip_delayed_job_auto_activation = true
  yield
ensure
  @skip_delayed_job_auto_activation = was
end

#unhold_jobs! ⇒ Object 



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# File 'lib/switchman_inst_jobs/switchman/shard.rb', line 70

def unhold_jobs!
  shards = all.to_a
  waited = false
  shards.each do |shard|
    shard.jobs_held = false
    next unless shard.changed?

    shard.save!
    next if waited

    # Wait a little over the 60 second in-process shard cache clearing
    # threshold to ensure that all new jobs are now being enqueued
    # unlocked
    Rails.logger.debug("Waiting for caches to clear")
    sleep(65)
    waited = true
  end
  shards_by_jobs_shard(shards).each do |jobs_shard, shard_ids|
    jobs_shard.activate(::Delayed::Backend::ActiveRecord::AbstractJob) do
      ::Delayed::Job.where(locked_by: ::Delayed::Backend::Base::ON_HOLD_LOCKED_BY, shard_id: shard_ids)
                    .in_batches(of: 10_000)
                    .update_all(
                      locked_by: nil,
                      locked_at: nil,
                      attempts: 0,
                      failed_at: nil
                    )
    end
  end
end