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|
# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::BackgroundMigration::BatchedMigrationJob do
let(:connection) { Gitlab::Database.database_base_models[:main].connection }
describe '.generic_instance' do
it 'defines generic instance with only some of the attributes set' do
generic_instance = described_class.generic_instance(
batch_table: 'projects', batch_column: 'id',
job_arguments: %w(x y), connection: connection
)
expect(generic_instance.send(:batch_table)).to eq('projects')
expect(generic_instance.send(:batch_column)).to eq('id')
expect(generic_instance.instance_variable_get('@job_arguments')).to eq(%w(x y))
expect(generic_instance.send(:connection)).to eq(connection)
%i(start_id end_id sub_batch_size pause_ms).each do |attr|
expect(generic_instance.send(attr)).to eq(0)
end
end
end
describe '.job_arguments' do
let(:job_class) do
Class.new(described_class) do
job_arguments :value_a, :value_b
end
end
subject(:job_instance) do
job_class.new(start_id: 1, end_id: 10,
batch_table: '_test_table',
batch_column: 'id',
sub_batch_size: 2,
pause_ms: 1000,
job_arguments: %w(a b),
connection: connection)
end
it 'defines methods' do
expect(job_instance.value_a).to eq('a')
expect(job_instance.value_b).to eq('b')
expect(job_class.job_arguments_count).to eq(2)
end
context 'when no job arguments are defined' do
let(:job_class) do
Class.new(described_class)
end
it 'job_arguments_count is 0' do
expect(job_class.job_arguments_count).to eq(0)
end
end
end
describe '.operation_name' do
subject(:perform_job) { job_instance.perform }
let(:job_instance) do
job_class.new(start_id: 1, end_id: 10,
batch_table: '_test_table',
batch_column: 'id',
sub_batch_size: 2,
pause_ms: 1000,
job_arguments: %w(a b),
connection: connection)
end
let(:job_class) do
Class.new(described_class) do
operation_name :update_all
end
end
it 'defines method' do
expect(job_instance.operation_name).to eq(:update_all)
end
context 'when `operation_name` is not defined' do
let(:job_class) do
Class.new(described_class) do
def perform
each_sub_batch do |sub_batch|
sub_batch.update_all('to_column = from_column')
end
end
end
end
let(:test_table) { table(:_test_table) }
let(:test_insert_table) { table(:_test_insert_table) }
before do
allow(job_instance).to receive(:sleep)
connection.create_table :_test_table do |t|
t.timestamps_with_timezone null: false
t.integer :from_column, null: false
end
connection.create_table :_test_insert_table, id: false do |t|
t.integer :to_column
t.index :to_column, unique: true
end
test_table.create!(id: 1, from_column: 5)
test_table.create!(id: 2, from_column: 10)
end
after do
connection.drop_table(:_test_table)
connection.drop_table(:_test_insert_table)
end
it 'raises an exception' do
expect { perform_job }.to raise_error(RuntimeError, /Operation name is required/)
end
end
end
describe '.scope_to' do
subject(:job_instance) do
job_class.new(start_id: 1, end_id: 10,
batch_table: '_test_table',
batch_column: 'id',
sub_batch_size: 2,
pause_ms: 1000,
job_arguments: %w(a b),
connection: connection)
end
context 'when additional scoping is defined' do
let(:job_class) do
Class.new(described_class) do
job_arguments :value_a, :value_b
scope_to ->(r) { "#{r}-#{value_a}-#{value_b}".upcase }
end
end
it 'applies additional scope to the provided relation' do
expect(job_instance.filter_batch('relation')).to eq('RELATION-A-B')
end
end
context 'when there is no additional scoping defined' do
let(:job_class) do
Class.new(described_class) do
end
end
it 'returns provided relation as is' do
expect(job_instance.filter_batch('relation')).to eq('relation')
end
end
end
describe 'descendants', :eager_load do
it 'have the same method signature for #perform' do
expected_arity = described_class.instance_method(:perform).arity
offences = described_class.descendants.select { |klass| klass.instance_method(:perform).arity != expected_arity }
expect(offences).to be_empty, "expected no descendants of #{described_class} to accept arguments for " \
"'#perform', but some do: #{offences.join(", ")}"
end
it 'do not use .batching_scope' do
offences = described_class.descendants.select { |klass| klass.respond_to?(:batching_scope) }
expect(offences).to be_empty, "expected no descendants of #{described_class} to define '.batching_scope', " \
"but some do: #{offences.join(", ")}"
end
end
describe '#perform' do
let(:connection) { Gitlab::Database.database_base_models[:main].connection }
let(:job_class) { Class.new(described_class) }
let(:job_instance) do
job_class.new(start_id: 1, end_id: 10,
batch_table: '_test_table',
batch_column: 'id',
sub_batch_size: 2,
pause_ms: 1000,
connection: connection)
end
subject(:perform_job) { job_instance.perform }
it 'raises an error if not overridden' do
expect { perform_job }.to raise_error(NotImplementedError, /must implement perform/)
end
context 'when the subclass uses sub-batching' do
let(:job_class) do
Class.new(described_class) do
operation_name :update
def perform(*job_arguments)
each_sub_batch(
batching_arguments: { order_hint: :updated_at },
batching_scope: -> (relation) { relation.where.not(bar: nil) }
) do |sub_batch|
sub_batch.update_all('to_column = from_column')
end
end
end
end
let(:test_table) { table(:_test_table) }
before do
allow(job_instance).to receive(:sleep)
connection.create_table :_test_table do |t|
t.timestamps_with_timezone null: false
t.integer :from_column, null: false
t.text :bar
t.integer :to_column
end
test_table.create!(id: 1, from_column: 5, bar: 'value')
test_table.create!(id: 2, from_column: 10, bar: 'value')
test_table.create!(id: 3, from_column: 15)
test_table.create!(id: 4, from_column: 20, bar: 'value')
end
after do
connection.drop_table(:_test_table)
end
it 'calls the operation for each sub-batch' do
expect { perform_job }.to change { test_table.where(to_column: nil).count }.from(4).to(1)
expect(test_table.order(:id).pluck(:to_column)).to contain_exactly(5, 10, nil, 20)
end
context 'with additional scoping' do
let(:job_class) do
Class.new(described_class) do
scope_to ->(r) { r.where('mod(id, 2) = 0') }
operation_name :update
def perform(*job_arguments)
each_sub_batch(
batching_arguments: { order_hint: :updated_at },
batching_scope: -> (relation) { relation.where.not(bar: nil) }
) do |sub_batch|
sub_batch.update_all('to_column = from_column')
end
end
end
end
it 'respects #filter_batch' do
expect { perform_job }.to change { test_table.where(to_column: nil).count }.from(4).to(2)
expect(test_table.order(:id).pluck(:to_column)).to contain_exactly(nil, 10, nil, 20)
end
end
it 'instruments the batch operation' do
expect(job_instance.batch_metrics.affected_rows).to be_empty
expect(job_instance.batch_metrics).to receive(:instrument_operation).with(:update).twice.and_call_original
perform_job
expect(job_instance.batch_metrics.affected_rows[:update]).to contain_exactly(2, 1)
end
it 'pauses after each sub-batch' do
expect(job_instance).to receive(:sleep).with(1.0).twice
perform_job
end
context 'when batching_arguments are given' do
it 'forwards them for batching' do
expect(job_instance).to receive(:base_relation).and_return(test_table)
expect(test_table).to receive(:each_batch).with(column: 'id', of: 2, order_hint: :updated_at)
perform_job
end
end
end
context 'when the subclass uses distinct each batch' do
let(:job_instance) do
job_class.new(start_id: 1,
end_id: 100,
batch_table: '_test_table',
batch_column: 'from_column',
sub_batch_size: 2,
pause_ms: 10,
connection: connection)
end
let(:job_class) do
Class.new(described_class) do
operation_name :insert
def perform(*job_arguments)
distinct_each_batch do |sub_batch|
sub_batch.pluck(:from_column).each do |value|
connection.execute("INSERT INTO _test_insert_table VALUES (#{value})")
end
sub_batch.size
end
end
end
end
let(:test_table) { table(:_test_table) }
let(:test_insert_table) { table(:_test_insert_table) }
before do
allow(job_instance).to receive(:sleep)
connection.create_table :_test_table do |t|
t.timestamps_with_timezone null: false
t.integer :from_column, null: false
end
connection.create_table :_test_insert_table, id: false do |t|
t.integer :to_column
t.index :to_column, unique: true
end
test_table.create!(id: 1, from_column: 5)
test_table.create!(id: 2, from_column: 10)
test_table.create!(id: 3, from_column: 10)
test_table.create!(id: 4, from_column: 5)
test_table.create!(id: 5, from_column: 15)
end
after do
connection.drop_table(:_test_table)
connection.drop_table(:_test_insert_table)
end
it 'calls the operation for each distinct batch' do
expect { perform_job }.to change { test_insert_table.pluck(:to_column) }.from([]).to([5, 10, 15])
end
it 'stores the affected rows' do
perform_job
expect(job_instance.batch_metrics.affected_rows[:insert]).to contain_exactly(2, 1)
end
context 'when used in combination with scope_to' do
let(:job_class) do
Class.new(described_class) do
scope_to ->(r) { r.where.not(from_column: 10) }
operation_name :insert
def perform(*job_arguments)
distinct_each_batch do |sub_batch|
end
end
end
end
it 'raises an error' do
expect { perform_job }.to raise_error RuntimeError,
/distinct_each_batch can not be used when additional filters are defined with scope_to/
end
end
end
end
end
|