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CREATE TABLE notifications ( |
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user_id UUID PRIMARY KEY REFERENCES users (id) ON DELETE CASCADE, |
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started_at TIMESTAMP NOT NULL DEFAULT now() |
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); |
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CREATE TABLE sent_notifications ( |
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(), |
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alert_id BIGINT NOT NULL REFERENCES alerts (id) ON DELETE CASCADE, |
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contact_method_id UUID NOT NULL REFERENCES user_contact_methods (id) ON DELETE CASCADE, |
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sent_at TIMESTAMP, |
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UNIQUE(alert_id,contact_method_id) |
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); |
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CREATE VIEW active_contact_methods AS |
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SELECT users.id as user_id, m.id as contact_method_id |
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FROM users, user_contact_methods m, user_notification_rules r, notifications n |
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WHERE m.user_id = users.id |
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AND r.user_id = users.id |
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AND n.user_id = users.id |
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AND r.contact_method_id = m.id |
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AND ((r.delay_minutes::text||' minutes')::interval + n.started_at) < now(); |
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CREATE VIEW triggered_alert_users AS |
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SELECT action.user_id as user_id, a.id as alert_id |
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FROM escalation_policy_actions action, escalation_policy_step step, service s, alerts a, alert_escalation_levels lvl |
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WHERE action.escalation_policy_step_id = step.id |
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AND step.escalation_policy_id = s.escalation_policy_id |
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AND step.step_number = lvl.relative_level |
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AND s.id = a.service_id |
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AND a.status = 'triggered'::enum_alert_status |
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GROUP BY a.id, action.user_id; |
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CREATE OR REPLACE FUNCTION update_notifications() RETURNS VOID AS |
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$$ |
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BEGIN |
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INSERT INTO notifications (user_id) |
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SELECT user_id FROM triggered_alert_users |
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GROUP BY user_id |
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ON CONFLICT DO NOTHING; |
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DELETE FROM notifications WHERE user_id NOT IN (SELECT user_id FROM triggered_alert_users WHERE user_id = user_id); |
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END; |
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$$ LANGUAGE 'plpgsql'; |
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CREATE OR REPLACE FUNCTION add_notifications() RETURNS TRIGGER AS |
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$$ |
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BEGIN |
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INSERT INTO notifications (user_id) |
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SELECT user_id FROM triggered_alert_users |
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WHERE alert_id = NEW.id |
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LIMIT 1 |
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ON CONFLICT DO NOTHING; |
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DELETE FROM notifications WHERE user_id NOT IN (SELECT user_id FROM triggered_alert_users WHERE user_id = user_id); |
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RETURN NEW; |
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END; |
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$$ LANGUAGE 'plpgsql'; |
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CREATE TRIGGER add_notifications_alert_changed |
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AFTER UPDATE OR INSERT ON alerts |
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FOR EACH ROW |
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EXECUTE PROCEDURE add_notifications(); |
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SELECT update_notifications(); |
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CREATE VIEW needs_notification_sent AS |
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SELECT trig.alert_id, acm.contact_method_id, cm.type, cm.value, a.description, s.name as service_name |
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FROM active_contact_methods acm, triggered_alert_users trig, user_contact_methods cm, alerts a, service s |
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WHERE acm.user_id = trig.user_id |
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AND acm.user_id = trig.user_id |
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AND cm.id = acm.contact_method_id |
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AND cm.disabled = FALSE |
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AND a.id = trig.alert_id |
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AND s.id = a.service_id |
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AND NOT EXISTS ( |
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SELECT id |
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FROM sent_notifications |
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WHERE alert_id = trig.alert_id |
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AND contact_method_id = acm.contact_method_id |
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AND sent_at IS NOT NULL |
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); |
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CREATE TABLE user_contact_method_locks ( |
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(), |
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client_id UUID NOT NULL, |
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alert_id BIGINT NOT NULL REFERENCES alerts (id) ON DELETE CASCADE, |
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contact_method_id UUID NOT NULL REFERENCES user_contact_methods (id) ON DELETE CASCADE, |
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timestamp TIMESTAMP NOT NULL DEFAULT now(), |
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UNIQUE (alert_id, contact_method_id) |
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); |
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CREATE OR REPLACE FUNCTION aquire_user_contact_method_lock(_client_id UUID, _alert_id BIGINT, _contact_method_id UUID) RETURNS UUID AS |
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$$ |
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DECLARE |
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lock_id UUID = gen_random_uuid(); |
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BEGIN |
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DELETE FROM user_contact_method_locks WHERE alert_id = _alert_id |
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AND contact_method_id = _contact_method_id |
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AND (timestamp + '5 minutes'::interval) < now(); |
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INSERT INTO user_contact_method_locks (id, alert_id, contact_method_id, client_id) |
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VALUES (lock_id, _alert_id, _contact_method_id, _client_id) |
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RETURNING id INTO lock_id; |
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INSERT INTO sent_notifications (id, alert_id, contact_method_id) VALUES (lock_id, _alert_id, _contact_method_id); |
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RETURN lock_id; |
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END; |
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$$ LANGUAGE 'plpgsql'; |
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CREATE OR REPLACE FUNCTION release_user_contact_method_lock(_client_id UUID, _id UUID, success BOOLEAN) RETURNS VOID AS |
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$$ |
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BEGIN |
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DELETE FROM user_contact_method_locks WHERE id = _id AND client_id = _client_id; |
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IF success |
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THEN |
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UPDATE sent_notifications SET sent_at = now() WHERE id = _id; |
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ELSE |
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DELETE FROM sent_notifications WHERE id = _id; |
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END IF; |
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END; |
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$$ LANGUAGE 'plpgsql'; |
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DROP FUNCTION update_notifications(); |
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DROP VIEW active_contact_methods; |
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DROP VIEW triggered_alert_users; |
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DROP TABLE sent_notifications; |
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DROP TABLE notifications; |
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