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-- +migrate Up
-- disable re-opening alerts
-- +migrate StatementBegin
CREATE OR REPLACE FUNCTION fn_prevent_reopen()
RETURNS trigger AS
$BODY$
BEGIN
IF OLD.status = 'closed' THEN
RAISE EXCEPTION 'cannot change status of closed alert';
END IF;
RETURN NEW;
END;
$BODY$
LANGUAGE plpgsql VOLATILE;
-- +migrate StatementEnd
CREATE TRIGGER trg_prevent_reopen
BEFORE UPDATE OF status
ON alerts
FOR EACH ROW
EXECUTE PROCEDURE fn_prevent_reopen();
-- collect EP snapshots when alerts are generated
CREATE TABLE alert_escalation_policy_snapshots (
alert_id BIGINT NOT NULL REFERENCES alerts (id) ON DELETE CASCADE,
step_number INT NOT NULL,
step_max INT NOT NULL,
step_delay INTERVAL NOT NULL,
repeat INT NOT NULL,
user_id UUID REFERENCES users (id) ON DELETE CASCADE,
schedule_id UUID REFERENCES schedules (id) ON DELETE CASCADE
);
CREATE VIEW alert_escalation_policies AS
WITH step_max AS (
SELECT escalation_policy_id, count(step_number) as step_max
FROM escalation_policy_steps
GROUP BY escalation_policy_id
)
SELECT a.id as alert_id, step.step_number, m.step_max, (step.delay::TEXT||' minutes')::INTERVAL as step_delay, e.repeat, act.user_id, act.schedule_id
FROM
alerts a,
escalation_policies e,
escalation_policy_steps step,
step_max m,
escalation_policy_actions act,
services svc
WHERE a.service_id = svc.id
AND e.id = svc.escalation_policy_id
AND step.escalation_policy_id = m.escalation_policy_id
AND step.escalation_policy_id = svc.escalation_policy_id
AND act.escalation_policy_step_id = step.id;
INSERT INTO alert_escalation_policy_snapshots
(alert_id, step_number, step_max, step_delay, repeat, user_id, schedule_id)
SELECT alert_id, step_number, step_max, step_delay, repeat, user_id, schedule_id
FROM alert_escalation_policies;
-- +migrate StatementBegin
CREATE OR REPLACE FUNCTION fn_snapshot_escalation_policy()
RETURNS trigger AS
$BODY$
BEGIN
INSERT INTO alert_escalation_policy_snapshots
(alert_id, step_number, step_max, step_delay, repeat, user_id, schedule_id)
SELECT alert_id, step_number, step_max, step_delay, repeat, user_id, schedule_id
FROM alert_escalation_policies pol
WHERE pol.alert_id = NEW.id;
RETURN NEW;
END;
$BODY$
LANGUAGE plpgsql VOLATILE;
-- +migrate StatementEnd
CREATE TRIGGER trg_snapshot_escalation_policy
AFTER INSERT
ON alerts
FOR EACH ROW
EXECUTE PROCEDURE fn_snapshot_escalation_policy();
-- Use snapshots when calculating notifications
-- +migrate StatementBegin
CREATE OR REPLACE FUNCTION escalate_alerts() RETURNS VOID AS
$$
BEGIN
UPDATE alerts
SET escalation_level = escalation_level + 1, last_escalation = now()
FROM alert_escalation_policy_snapshots e
WHERE (last_escalation + e.step_delay) < now()
AND status = 'triggered'
AND id = e.alert_id
AND e.step_number = (escalation_level % e.step_max)
AND (e.repeat = -1 OR (escalation_level+1) / e.step_max <= e.repeat);
END;
$$ LANGUAGE 'plpgsql';
-- +migrate StatementEnd
CREATE OR REPLACE VIEW on_call_alert_users AS
WITH alert_users AS (
SELECT s.user_id,
s.schedule_id,
s.alert_id,
a.status,
a.escalation_level
FROM
alerts a,
alert_escalation_policy_snapshots s
WHERE s.alert_id = a.id
AND s.step_number = (a.escalation_level % s.step_max)
AND a.status <> 'closed'
)
SELECT DISTINCT au.alert_id,
au.status,
CASE
WHEN au.user_id IS NULL THEN oc.user_id
ELSE au.user_id
END AS user_id,
au.escalation_level
FROM alert_users au
LEFT JOIN on_call oc ON au.schedule_id = oc.schedule_id;
DROP VIEW alert_escalation_levels;
-- +migrate Down
CREATE VIEW alert_escalation_levels AS
SELECT
alerts.id AS alert_id,
count(step.id) AS levels,
alerts.escalation_level::bigint % count(step.id) AS relative_level
FROM
alerts,
escalation_policy_steps step,
services s
WHERE step.escalation_policy_id = s.escalation_policy_id
AND s.id = alerts.service_id
GROUP BY alerts.id;
-- +migrate StatementBegin
CREATE OR REPLACE FUNCTION escalate_alerts() RETURNS VOID AS
$$
BEGIN
UPDATE alerts a
SET escalation_level = escalation_level + 1, last_escalation = now()
FROM services s, escalation_policy_steps step, alert_escalation_levels lvl, escalation_policies e
WHERE (last_escalation + (step.delay::TEXT||' minutes')::interval) < now()
AND a.status = 'triggered'::enum_alert_status
AND s.id = a.service_id
AND step.escalation_policy_id = s.escalation_policy_id
AND lvl.alert_id = a.id
AND step.step_number = lvl.relative_level
AND e.id = s.escalation_policy_id
AND (e.repeat = -1 OR (escalation_level+1) / lvl.levels <= e.repeat);
END;
$$ LANGUAGE 'plpgsql';
-- +migrate StatementEnd
CREATE OR REPLACE VIEW on_call_alert_users AS
WITH alert_users AS (
SELECT act.user_id,
act.schedule_id,
a.id AS alert_id,
a.status,
a.escalation_level
FROM alerts a,
services s,
alert_escalation_levels lvl,
escalation_policy_steps step,
escalation_policy_actions act
WHERE s.id = a.service_id
AND lvl.alert_id = a.id
AND step.escalation_policy_id = s.escalation_policy_id
AND step.step_number = lvl.relative_level
AND a.status <> 'closed'::enum_alert_status
AND act.escalation_policy_step_id = step.id
GROUP BY act.user_id, act.schedule_id, a.id
)
SELECT DISTINCT au.alert_id,
au.status,
CASE
WHEN au.user_id IS NULL THEN oc.user_id
ELSE au.user_id
END AS user_id,
au.escalation_level
FROM alert_users au
LEFT JOIN on_call oc ON au.schedule_id = oc.schedule_id;
DROP TRIGGER trg_snapshot_escalation_policy ON alerts;
DROP TRIGGER trg_prevent_reopen ON alerts;
DROP FUNCTION fn_snapshot_escalation_policy();
DROP FUNCTION fn_prevent_reopen();
DROP TABLE alert_escalation_policy_snapshots;
DROP VIEW alert_escalation_policies;
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