94 lines
3.4 KiB
Ruby
94 lines
3.4 KiB
Ruby
#
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# Copyright (C) 2015 - present Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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class AddMaxConcurrentToJobs < ActiveRecord::Migration[4.2]
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tag :predeploy
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def connection
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Delayed::Backend::ActiveRecord::Job.connection
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end
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def up
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add_column :delayed_jobs, :max_concurrent, :integer, :default => 1, :null => false
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if connection.adapter_name == 'PostgreSQL'
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search_path = Shard.current.name
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execute(<<-CODE)
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CREATE OR REPLACE FUNCTION #{connection.quote_table_name('delayed_jobs_before_insert_row_tr_fn')} () RETURNS trigger AS $$
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BEGIN
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IF NEW.strand IS NOT NULL THEN
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PERFORM pg_advisory_xact_lock(half_md5_as_bigint(NEW.strand));
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IF (SELECT COUNT(*) FROM delayed_jobs WHERE strand = NEW.strand) >= NEW.max_concurrent THEN
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NEW.next_in_strand := 'f';
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END IF;
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql SET search_path TO #{search_path};
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CODE
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execute(<<-CODE)
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CREATE OR REPLACE FUNCTION #{connection.quote_table_name('delayed_jobs_after_delete_row_tr_fn')} () RETURNS trigger AS $$
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BEGIN
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IF OLD.strand IS NOT NULL THEN
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PERFORM pg_advisory_xact_lock(half_md5_as_bigint(OLD.strand));
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IF (SELECT COUNT(*) FROM delayed_jobs WHERE strand = OLD.strand AND next_in_strand = 't') < OLD.max_concurrent THEN
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UPDATE delayed_jobs SET next_in_strand = 't' WHERE id = (
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SELECT id FROM delayed_jobs j2 WHERE next_in_strand = 'f' AND
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j2.strand = OLD.strand ORDER BY j2.id ASC LIMIT 1 FOR UPDATE
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);
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END IF;
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END IF;
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RETURN OLD;
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END;
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$$ LANGUAGE plpgsql SET search_path TO #{search_path};
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CODE
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end
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end
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def down
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remove_column :delayed_jobs, :max_concurrent
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if connection.adapter_name == 'PostgreSQL'
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search_path = Shard.current.name
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execute(<<-CODE)
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CREATE OR REPLACE FUNCTION #{connection.quote_table_name('delayed_jobs_before_insert_row_tr_fn')} () RETURNS trigger AS $$
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BEGIN
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PERFORM pg_advisory_xact_lock(half_md5_as_bigint(NEW.strand));
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IF (SELECT 1 FROM delayed_jobs WHERE strand = NEW.strand LIMIT 1) = 1 THEN
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NEW.next_in_strand := 'f';
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql SET search_path TO #{search_path};
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CODE
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execute(<<-CODE)
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CREATE OR REPLACE FUNCTION #{connection.quote_table_name('delayed_jobs_after_delete_row_tr_fn')} () RETURNS trigger AS $$
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BEGIN
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PERFORM pg_advisory_xact_lock(half_md5_as_bigint(OLD.strand));
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UPDATE delayed_jobs SET next_in_strand = 't' WHERE id = (SELECT id FROM delayed_jobs j2 WHERE j2.strand = OLD.strand ORDER BY j2.strand, j2.id ASC LIMIT 1 FOR UPDATE);
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RETURN OLD;
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END;
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$$ LANGUAGE plpgsql SET search_path TO #{search_path};
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CODE
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end
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end
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end
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