409 lines
13 KiB
PL/PgSQL
409 lines
13 KiB
PL/PgSQL
-- +goose Up
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-- +goose StatementBegin
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-- River migration 002 [up]
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CREATE TYPE river_job_state AS ENUM (
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'available',
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'cancelled',
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'completed',
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'discarded',
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'pending',
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'retryable',
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'running',
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'scheduled'
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);
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CREATE TABLE river_job(
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-- 8 bytes
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id bigserial PRIMARY KEY,
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-- 8 bytes (4 bytes + 2 bytes + 2 bytes)
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--
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-- `state` is kept near the top of the table for operator convenience -- when
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-- looking at jobs with `SELECT *` it'll appear first after ID. The other two
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-- fields aren't as important but are kept adjacent to `state` for alignment
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-- to get an 8-byte block.
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state river_job_state NOT NULL DEFAULT 'available',
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attempt smallint NOT NULL DEFAULT 0,
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max_attempts smallint NOT NULL,
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-- 8 bytes each (no alignment needed)
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attempted_at timestamptz,
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created_at timestamptz NOT NULL DEFAULT NOW(),
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finalized_at timestamptz,
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scheduled_at timestamptz NOT NULL DEFAULT NOW(),
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-- 2 bytes (some wasted padding probably)
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priority smallint NOT NULL DEFAULT 1,
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-- types stored out-of-band
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args jsonb,
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attempted_by text[],
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errors jsonb[],
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kind text NOT NULL,
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metadata jsonb NOT NULL DEFAULT '{}',
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queue text NOT NULL DEFAULT 'default',
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tags varchar(255)[],
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CONSTRAINT finalized_or_finalized_at_null CHECK ((state IN ('cancelled', 'completed', 'discarded') AND finalized_at IS NOT NULL) OR finalized_at IS NULL),
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CONSTRAINT max_attempts_is_positive CHECK (max_attempts > 0),
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CONSTRAINT priority_in_range CHECK (priority >= 1 AND priority <= 4),
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CONSTRAINT queue_length CHECK (char_length(queue) > 0 AND char_length(queue) < 128),
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CONSTRAINT kind_length CHECK (char_length(kind) > 0 AND char_length(kind) < 128)
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);
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-- We may want to consider adding another property here after `kind` if it seems
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-- like it'd be useful for something.
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CREATE INDEX river_job_kind ON river_job USING btree(kind);
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CREATE INDEX river_job_state_and_finalized_at_index ON river_job USING btree(state, finalized_at) WHERE finalized_at IS NOT NULL;
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CREATE INDEX river_job_prioritized_fetching_index ON river_job USING btree(state, queue, priority, scheduled_at, id);
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CREATE INDEX river_job_args_index ON river_job USING GIN(args);
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CREATE INDEX river_job_metadata_index ON river_job USING GIN(metadata);
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CREATE OR REPLACE FUNCTION river_job_notify()
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RETURNS TRIGGER
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AS $$
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DECLARE
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payload json;
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BEGIN
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IF NEW.state = 'available' THEN
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-- Notify will coalesce duplicate notifications within a transaction, so
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-- keep these payloads generalized:
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payload = json_build_object('queue', NEW.queue);
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PERFORM
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pg_notify('river_insert', payload::text);
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END IF;
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RETURN NULL;
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END;
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$$
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LANGUAGE plpgsql;
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CREATE TRIGGER river_notify
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AFTER INSERT ON river_job
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FOR EACH ROW
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EXECUTE PROCEDURE river_job_notify();
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CREATE UNLOGGED TABLE river_leader(
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-- 8 bytes each (no alignment needed)
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elected_at timestamptz NOT NULL,
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expires_at timestamptz NOT NULL,
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-- types stored out-of-band
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leader_id text NOT NULL,
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name text PRIMARY KEY,
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CONSTRAINT name_length CHECK (char_length(name) > 0 AND char_length(name) < 128),
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CONSTRAINT leader_id_length CHECK (char_length(leader_id) > 0 AND char_length(leader_id) < 128)
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);
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-- River migration 003 [up]
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ALTER TABLE river_job ALTER COLUMN tags SET DEFAULT '{}';
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UPDATE river_job SET tags = '{}' WHERE tags IS NULL;
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ALTER TABLE river_job ALTER COLUMN tags SET NOT NULL;
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-- River migration 004 [up]
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-- The args column never had a NOT NULL constraint or default value at the
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-- database level, though we tried to ensure one at the application level.
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ALTER TABLE river_job ALTER COLUMN args SET DEFAULT '{}';
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UPDATE river_job SET args = '{}' WHERE args IS NULL;
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ALTER TABLE river_job ALTER COLUMN args SET NOT NULL;
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ALTER TABLE river_job ALTER COLUMN args DROP DEFAULT;
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-- The metadata column never had a NOT NULL constraint or default value at the
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-- database level, though we tried to ensure one at the application level.
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ALTER TABLE river_job ALTER COLUMN metadata SET DEFAULT '{}';
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UPDATE river_job SET metadata = '{}' WHERE metadata IS NULL;
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ALTER TABLE river_job ALTER COLUMN metadata SET NOT NULL;
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-- The 'pending' job state will be used for upcoming functionality:
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-- ALTER TYPE river_job_state ADD VALUE IF NOT EXISTS 'pending' AFTER 'discarded';
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ALTER TABLE river_job DROP CONSTRAINT finalized_or_finalized_at_null;
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ALTER TABLE river_job ADD CONSTRAINT finalized_or_finalized_at_null CHECK (
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(finalized_at IS NULL AND state NOT IN ('cancelled', 'completed', 'discarded')) OR
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(finalized_at IS NOT NULL AND state IN ('cancelled', 'completed', 'discarded'))
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);
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DROP TRIGGER river_notify ON river_job;
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DROP FUNCTION river_job_notify;
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CREATE TABLE river_queue(
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name text PRIMARY KEY NOT NULL,
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created_at timestamptz NOT NULL DEFAULT NOW(),
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metadata jsonb NOT NULL DEFAULT '{}' ::jsonb,
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paused_at timestamptz,
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updated_at timestamptz NOT NULL
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);
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ALTER TABLE river_leader
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ALTER COLUMN name SET DEFAULT 'default',
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DROP CONSTRAINT name_length,
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ADD CONSTRAINT name_length CHECK (name = 'default');
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-- River migration 005 [up]
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--
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-- Rebuild the migration table so it's based on `(line, version)`.
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--
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DO
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$body$
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BEGIN
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-- Tolerate users who may be using their own migration system rather than
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-- River's. If they are, they will have skipped version 001 containing
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-- `CREATE TABLE river_migration`, so this table won't exist.
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IF (SELECT to_regclass('river_migration') IS NOT NULL) THEN
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ALTER TABLE river_migration
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RENAME TO river_migration_old;
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CREATE TABLE river_migration(
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line TEXT NOT NULL,
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version bigint NOT NULL,
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created_at timestamptz NOT NULL DEFAULT NOW(),
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CONSTRAINT line_length CHECK (char_length(line) > 0 AND char_length(line) < 128),
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CONSTRAINT version_gte_1 CHECK (version >= 1),
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PRIMARY KEY (line, version)
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);
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INSERT INTO river_migration
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(created_at, line, version)
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SELECT created_at, 'main', version
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FROM river_migration_old;
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DROP TABLE river_migration_old;
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END IF;
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END;
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$body$
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LANGUAGE 'plpgsql';
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--
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-- Add `river_job.unique_key` and bring up an index on it.
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--
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-- These statements use `IF NOT EXISTS` to allow users with a `river_job` table
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-- of non-trivial size to build the index `CONCURRENTLY` out of band of this
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-- migration, then follow by completing the migration.
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ALTER TABLE river_job
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ADD COLUMN IF NOT EXISTS unique_key bytea;
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CREATE UNIQUE INDEX IF NOT EXISTS river_job_kind_unique_key_idx ON river_job (kind, unique_key) WHERE unique_key IS NOT NULL;
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--
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-- Create `river_client` and derivative.
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--
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-- This feature hasn't quite yet been implemented, but we're taking advantage of
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-- the migration to add the schema early so that we can add it later without an
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-- additional migration.
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--
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CREATE UNLOGGED TABLE river_client (
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id text PRIMARY KEY NOT NULL,
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created_at timestamptz NOT NULL DEFAULT now(),
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metadata jsonb NOT NULL DEFAULT '{}',
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paused_at timestamptz,
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updated_at timestamptz NOT NULL,
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CONSTRAINT name_length CHECK (char_length(id) > 0 AND char_length(id) < 128)
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);
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-- Differs from `river_queue` in that it tracks the queue state for a particular
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-- active client.
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CREATE UNLOGGED TABLE river_client_queue (
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river_client_id text NOT NULL REFERENCES river_client (id) ON DELETE CASCADE,
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name text NOT NULL,
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created_at timestamptz NOT NULL DEFAULT now(),
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max_workers bigint NOT NULL DEFAULT 0,
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metadata jsonb NOT NULL DEFAULT '{}',
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num_jobs_completed bigint NOT NULL DEFAULT 0,
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num_jobs_running bigint NOT NULL DEFAULT 0,
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updated_at timestamptz NOT NULL,
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PRIMARY KEY (river_client_id, name),
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CONSTRAINT name_length CHECK (char_length(name) > 0 AND char_length(name) < 128),
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CONSTRAINT num_jobs_completed_zero_or_positive CHECK (num_jobs_completed >= 0),
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CONSTRAINT num_jobs_running_zero_or_positive CHECK (num_jobs_running >= 0)
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);
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-- River migration 006 [up]
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CREATE OR REPLACE FUNCTION river_job_state_in_bitmask(bitmask BIT(8), state river_job_state)
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RETURNS boolean
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LANGUAGE SQL
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IMMUTABLE
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AS $$
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SELECT CASE state
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WHEN 'available' THEN get_bit(bitmask, 7)
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WHEN 'cancelled' THEN get_bit(bitmask, 6)
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WHEN 'completed' THEN get_bit(bitmask, 5)
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WHEN 'discarded' THEN get_bit(bitmask, 4)
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WHEN 'pending' THEN get_bit(bitmask, 3)
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WHEN 'retryable' THEN get_bit(bitmask, 2)
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WHEN 'running' THEN get_bit(bitmask, 1)
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WHEN 'scheduled' THEN get_bit(bitmask, 0)
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ELSE 0
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END = 1;
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$$;
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--
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-- Add `river_job.unique_states` and bring up an index on it.
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--
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-- This column may exist already if users manually created the column and index
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-- as instructed in the changelog so the index could be created `CONCURRENTLY`.
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--
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ALTER TABLE river_job ADD COLUMN IF NOT EXISTS unique_states BIT(8);
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-- This statement uses `IF NOT EXISTS` to allow users with a `river_job` table
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-- of non-trivial size to build the index `CONCURRENTLY` out of band of this
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-- migration, then follow by completing the migration.
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CREATE UNIQUE INDEX IF NOT EXISTS river_job_unique_idx ON river_job (unique_key)
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WHERE unique_key IS NOT NULL
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AND unique_states IS NOT NULL
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AND river_job_state_in_bitmask(unique_states, state);
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-- Remove the old unique index. Users who are actively using the unique jobs
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-- feature and who wish to avoid deploy downtime may want od drop this in a
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-- subsequent migration once all jobs using the old unique system have been
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-- completed (i.e. no more rows with non-null unique_key and null
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-- unique_states).
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DROP INDEX river_job_kind_unique_key_idx;
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-- +goose StatementEnd
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-- +goose Down
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-- +goose StatementBegin
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-- Drop Users Table
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-- River migration 006 [down]
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--
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-- Drop `river_job.unique_states` and its index.
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--
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DROP INDEX river_job_unique_idx;
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ALTER TABLE river_job
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DROP COLUMN unique_states;
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CREATE UNIQUE INDEX IF NOT EXISTS river_job_kind_unique_key_idx ON river_job (kind, unique_key) WHERE unique_key IS NOT NULL;
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--
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-- Drop `river_job_state_in_bitmask` function.
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--
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DROP FUNCTION river_job_state_in_bitmask;
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-- River migration 005 [down]
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--
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-- Revert to migration table based only on `(version)`.
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--
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-- If any non-main migrations are present, 005 is considered irreversible.
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--
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DO
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$body$
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BEGIN
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-- Tolerate users who may be using their own migration system rather than
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-- River's. If they are, they will have skipped version 001 containing
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-- `CREATE TABLE river_migration`, so this table won't exist.
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IF (SELECT to_regclass('river_migration') IS NOT NULL) THEN
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IF EXISTS (
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SELECT *
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FROM river_migration
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WHERE line <> 'main'
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) THEN
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RAISE EXCEPTION 'Found non-main migration lines in the database; version 005 migration is irreversible because it would result in loss of migration information.';
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END IF;
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ALTER TABLE river_migration
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RENAME TO river_migration_old;
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CREATE TABLE river_migration(
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id bigserial PRIMARY KEY,
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created_at timestamptz NOT NULL DEFAULT NOW(),
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version bigint NOT NULL,
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CONSTRAINT version CHECK (version >= 1)
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);
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CREATE UNIQUE INDEX ON river_migration USING btree(version);
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INSERT INTO river_migration
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(created_at, version)
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SELECT created_at, version
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FROM river_migration_old;
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DROP TABLE river_migration_old;
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END IF;
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END;
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$body$
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LANGUAGE 'plpgsql';
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--
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-- Drop `river_job.unique_key`.
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--
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ALTER TABLE river_job
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DROP COLUMN unique_key;
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--
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-- Drop `river_client` and derivative.
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--
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DROP TABLE river_client_queue;
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DROP TABLE river_client;
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-- River migration 004 [down]
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ALTER TABLE river_job ALTER COLUMN args DROP NOT NULL;
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ALTER TABLE river_job ALTER COLUMN metadata DROP NOT NULL;
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ALTER TABLE river_job ALTER COLUMN metadata DROP DEFAULT;
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-- It is not possible to safely remove 'pending' from the river_job_state enum,
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-- so leave it in place.
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ALTER TABLE river_job DROP CONSTRAINT finalized_or_finalized_at_null;
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ALTER TABLE river_job ADD CONSTRAINT finalized_or_finalized_at_null CHECK (
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(state IN ('cancelled', 'completed', 'discarded') AND finalized_at IS NOT NULL) OR finalized_at IS NULL
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);
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CREATE OR REPLACE FUNCTION river_job_notify()
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RETURNS TRIGGER
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AS $$
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DECLARE
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payload json;
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BEGIN
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IF NEW.state = 'available' THEN
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-- Notify will coalesce duplicate notifications within a transaction, so
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-- keep these payloads generalized:
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payload = json_build_object('queue', NEW.queue);
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PERFORM
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pg_notify('river_insert', payload::text);
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END IF;
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RETURN NULL;
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END;
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$$
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LANGUAGE plpgsql;
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CREATE TRIGGER river_notify
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AFTER INSERT ON river_job
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FOR EACH ROW
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EXECUTE PROCEDURE river_job_notify();
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DROP TABLE river_queue;
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ALTER TABLE river_leader
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ALTER COLUMN name DROP DEFAULT,
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DROP CONSTRAINT name_length,
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ADD CONSTRAINT name_length CHECK (char_length(name) > 0 AND char_length(name) < 128);
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-- River migration 003 [down]
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ALTER TABLE river_job ALTER COLUMN tags DROP NOT NULL,
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ALTER COLUMN tags DROP DEFAULT;
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-- River migration 002 [down]
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DROP TABLE river_job;
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DROP FUNCTION river_job_notify;
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DROP TYPE river_job_state;
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DROP TABLE river_leader;
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-- +goose StatementEnd
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