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defmodule Pleroma.Repo.Migrations.UpdateCounterCacheTable do
use Ecto.Migration
@function_name "update_status_visibility_counter_cache"
@trigger_name "status_visibility_counter_cache_trigger"
def up do
execute("drop trigger if exists #{@trigger_name} on activities")
execute("drop function if exists #{@function_name}()")
drop_if_exists(unique_index(:counter_cache, [:name]))
drop_if_exists(table(:counter_cache))
create_if_not_exists table(:counter_cache) do
add(:instance, :string, null: false)
add(:direct, :bigint, null: false, default: 0)
add(:private, :bigint, null: false, default: 0)
add(:unlisted, :bigint, null: false, default: 0)
add(:public, :bigint, null: false, default: 0)
end
create_if_not_exists(unique_index(:counter_cache, [:instance]))
"""
CREATE OR REPLACE FUNCTION #{@function_name}()
RETURNS TRIGGER AS
$$
DECLARE
hostname character varying(255);
visibility_new character varying(64);
visibility_old character varying(64);
actor character varying(255);
BEGIN
IF TG_OP = 'DELETE' THEN
actor := OLD.actor;
ELSE
actor := NEW.actor;
END IF;
hostname := split_part(actor, '/', 3);
IF TG_OP = 'INSERT' THEN
visibility_new := activity_visibility(NEW.actor, NEW.recipients, NEW.data);
IF NEW.data->>'type' = 'Create'
AND visibility_new IN ('public', 'unlisted', 'private', 'direct') THEN
EXECUTE format('INSERT INTO "counter_cache" ("instance", %1$I) VALUES ($1, 1)
ON CONFLICT ("instance") DO
UPDATE SET %1$I = "counter_cache".%1$I + 1', visibility_new)
USING hostname;
END IF;
RETURN NEW;
ELSIF TG_OP = 'UPDATE' THEN
visibility_new := activity_visibility(NEW.actor, NEW.recipients, NEW.data);
visibility_old := activity_visibility(OLD.actor, OLD.recipients, OLD.data);
IF (NEW.data->>'type' = 'Create')
AND (OLD.data->>'type' = 'Create')
AND visibility_new != visibility_old
AND visibility_new IN ('public', 'unlisted', 'private', 'direct') THEN
EXECUTE format('UPDATE "counter_cache" SET
%1$I = greatest("counter_cache".%1$I - 1, 0),
%2$I = "counter_cache".%2$I + 1
WHERE "instance" = $1', visibility_old, visibility_new)
USING hostname;
END IF;
RETURN NEW;
ELSIF TG_OP = 'DELETE' THEN
IF OLD.data->>'type' = 'Create' THEN
visibility_old := activity_visibility(OLD.actor, OLD.recipients, OLD.data);
EXECUTE format('UPDATE "counter_cache" SET
%1$I = greatest("counter_cache".%1$I - 1, 0)
WHERE "instance" = $1', visibility_old)
USING hostname;
END IF;
RETURN OLD;
END IF;
END;
$$
LANGUAGE 'plpgsql';
"""
|> execute()
execute("DROP TRIGGER IF EXISTS #{@trigger_name} ON activities")
"""
CREATE TRIGGER #{@trigger_name}
BEFORE
INSERT
OR UPDATE of recipients, data
OR DELETE
ON activities
FOR EACH ROW
EXECUTE PROCEDURE #{@function_name}();
"""
|> execute()
end
def down do
execute("DROP TRIGGER IF EXISTS #{@trigger_name} ON activities")
execute("DROP FUNCTION IF EXISTS #{@function_name}()")
drop_if_exists(unique_index(:counter_cache, [:instance]))
drop_if_exists(table(:counter_cache))
create_if_not_exists table(:counter_cache) do
add(:name, :string, null: false)
add(:count, :bigint, null: false, default: 0)
end
create_if_not_exists(unique_index(:counter_cache, [:name]))
"""
CREATE OR REPLACE FUNCTION #{@function_name}()
RETURNS TRIGGER AS
$$
DECLARE
BEGIN
IF TG_OP = 'INSERT' THEN
IF NEW.data->>'type' = 'Create' THEN
EXECUTE 'INSERT INTO counter_cache (name, count) VALUES (''status_visibility_' || activity_visibility(NEW.actor, NEW.recipients, NEW.data) || ''', 1) ON CONFLICT (name) DO UPDATE SET count = counter_cache.count + 1';
END IF;
RETURN NEW;
ELSIF TG_OP = 'UPDATE' THEN
IF (NEW.data->>'type' = 'Create') and (OLD.data->>'type' = 'Create') and activity_visibility(NEW.actor, NEW.recipients, NEW.data) != activity_visibility(OLD.actor, OLD.recipients, OLD.data) THEN
EXECUTE 'INSERT INTO counter_cache (name, count) VALUES (''status_visibility_' || activity_visibility(NEW.actor, NEW.recipients, NEW.data) || ''', 1) ON CONFLICT (name) DO UPDATE SET count = counter_cache.count + 1';
EXECUTE 'update counter_cache SET count = counter_cache.count - 1 where count > 0 and name = ''status_visibility_' || activity_visibility(OLD.actor, OLD.recipients, OLD.data) || ''';';
END IF;
RETURN NEW;
ELSIF TG_OP = 'DELETE' THEN
IF OLD.data->>'type' = 'Create' THEN
EXECUTE 'update counter_cache SET count = counter_cache.count - 1 where count > 0 and name = ''status_visibility_' || activity_visibility(OLD.actor, OLD.recipients, OLD.data) || ''';';
END IF;
RETURN OLD;
END IF;
END;
$$
LANGUAGE 'plpgsql';
"""
|> execute()
"""
CREATE TRIGGER #{@trigger_name} BEFORE INSERT OR UPDATE of recipients, data OR DELETE ON activities
FOR EACH ROW
EXECUTE PROCEDURE #{@function_name}();
"""
|> execute()
end
end
|
