0013.yml

version: 13
description: add capacity to worker pools
methods:
  get_worker_pool:
    deprecated: true
    # no changes required
  get_worker_pools:
    deprecated: true
    # no changes required
  update_worker_pool:
    deprecated: true
    # no changes required
  get_worker_pool_with_capacity:
    description: |-
      Get an existing worker pool.  The returned table will have one or (if no such worker pool is defined) zero rows.
    mode: read
    serviceName: worker_manager
    args: worker_pool_id_in text
    returns: table(worker_pool_id text, provider_id text, previous_provider_ids jsonb, description text, config jsonb, created timestamptz, last_modified timestamptz, owner text, email_on_error boolean, provider_data jsonb, current_capacity integer)
    body: |-
      begin
        return query
        select
          worker_pools.worker_pool_id,
          worker_pools.provider_id,
          worker_pools.previous_provider_ids,
          worker_pools.description,
          worker_pools.config,
          worker_pools.created,
          worker_pools.last_modified,
          worker_pools.owner,
          worker_pools.email_on_error,
          worker_pools.provider_data,
          coalesce((
            select sum(workers.capacity) from workers where
              workers.worker_pool_id = worker_pool_id_in and
              workers.state != 'stopped'),
            0)::integer -- sum always wants to return a bigint but we're always going to be safely within integer range
        from worker_pools
        where worker_pools.worker_pool_id = worker_pool_id_in;
      end
  get_worker_pools_with_capacity:
    description: |-
      Get existing worker pools, ordered by `worker_pool_id`.  If the pagination arguments are both NULL, all rows are returned.
      Otherwise, page_size rows are returned at offset page_offset.
    mode: read
    serviceName: worker_manager
    args: page_size_in integer, page_offset_in integer
    returns: table(worker_pool_id text, provider_id text, previous_provider_ids jsonb, description text, config jsonb, created timestamptz, last_modified timestamptz, owner text, email_on_error boolean, provider_data jsonb, current_capacity integer)
    body: |-
      begin
        return query
        select
          worker_pools.worker_pool_id,
          worker_pools.provider_id,
          worker_pools.previous_provider_ids,
          worker_pools.description,
          worker_pools.config,
          worker_pools.created,
          worker_pools.last_modified,
          worker_pools.owner,
          worker_pools.email_on_error,
          worker_pools.provider_data,
          coalesce(sum(worker_capacities.capacity), 0)::integer -- sum always wants to return a bigint but we're always going to be safely within integer range
        from worker_pools
        left join (
          select workers.worker_pool_id, workers.capacity from workers
            where workers.state != 'stopped'
        ) as worker_capacities
        on worker_pools.worker_pool_id = worker_capacities.worker_pool_id
        group by worker_pools.worker_pool_id
        order by worker_pools.worker_pool_id
        limit get_page_limit(page_size_in)
        offset get_page_offset(page_offset_in);
      end
  update_worker_pool_with_capacity:
    description: |-
      Update API-accessible columns on an existig worker pool.  All fields are
      overridden, but if the provider_id changes, then the existing provider_id
      is added to previous_provider_ids.  The return value contains values
      required for an API response and previous_provider_id (singular) containing
      the provider_id found before the update.  If no such worker pool exists,
      the return value is an empty set.
    mode: write
    serviceName: worker_manager
    args: worker_pool_id_in text, provider_id_in text, description_in text, config_in jsonb, last_modified_in timestamptz, owner_in text, email_on_error_in boolean
    returns: table(worker_pool_id text, provider_id text, description text, config jsonb, created timestamptz, last_modified timestamptz, owner text, email_on_error boolean, previous_provider_id text, current_capacity integer)
    body: |-
      declare
        existing record;
      begin
        select
          worker_pools.provider_id,
          worker_pools.previous_provider_ids
        from worker_pools
        where worker_pools.worker_pool_id = worker_pool_id_in
        -- lock this row for the duration of this transaction..
        for update
        into existing;

        -- update previous_provider_ids, if the provider_id has changed
        if existing.provider_id <> provider_id_in then
          -- remove both provider IDs to avoid duplicates, then re-add existing.provider_id
          existing.previous_provider_ids = (existing.previous_provider_ids - provider_id_in - existing.provider_id) || jsonb_build_array(existing.provider_id);
        end if;

        return query update worker_pools
        set
          provider_id = provider_id_in,
          description = description_in,
          config = config_in,
          last_modified = last_modified_in,
          owner = owner_in,
          email_on_error = email_on_error_in,
          previous_provider_ids = existing.previous_provider_ids
        where worker_pools.worker_pool_id = worker_pool_id_in
        returning
          worker_pools.worker_pool_id,
          worker_pools.provider_id,
          worker_pools.description,
          worker_pools.config,
          worker_pools.created,
          worker_pools.last_modified,
          worker_pools.owner,
          worker_pools.email_on_error,
          existing.provider_id as previous_provider_id,
          coalesce((
            select sum(workers.capacity) from workers where
              workers.worker_pool_id = worker_pool_id_in and
              workers.state != 'stopped'),
            0)::integer; -- sum always wants to return a bigint but we're always going to be safely within integer range
      end