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# frozen_string_literal: true
# rubocop:todo all
require 'spec_helper'
describe 'QueryCache with transactions' do
# Work around https://jira.mongodb.org/browse/HELP-10518
before(:all) do
client = ClientRegistry.instance.global_client('authorized')
Utils.create_collection(client, 'test')
Utils.mongos_each_direct_client do |client|
client['test'].distinct('foo').to_a
end
end
around do |spec|
Mongo::QueryCache.clear
Mongo::QueryCache.cache { spec.run }
end
# These tests do not currently use the session registry because transactions
# leak sessions independently of the query cache. This will be resolved by
# RUBY-2391.
let(:subscriber) { Mrss::EventSubscriber.new }
let(:client) do
authorized_client.tap do |client|
client.subscribe(Mongo::Monitoring::COMMAND, subscriber)
end
end
before do
collection.delete_many
# Work around https://jira.mongodb.org/browse/HELP-10518
client.start_session do |session|
session.with_transaction do
collection.find({}, session: session).to_a
end
end
subscriber.clear_events!
end
describe 'in transactions' do
require_transaction_support
require_wired_tiger
let(:collection) { client['test'] }
let(:events) do
subscriber.command_started_events('find')
end
context 'with convenient API' do
context 'when same query is performed inside and outside of transaction' do
it 'performs one query' do
collection.find.to_a
session = client.start_session
session.with_transaction do
collection.find({}, session: session).to_a
end
expect(subscriber.command_started_events('find').length).to eq(1)
end
end
context 'when transaction has a different read concern' do
it 'performs two queries' do
collection.find.to_a
session = client.start_session
session.with_transaction(
read_concern: { level: :snapshot }
) do
collection.find({}, session: session).to_a
end
expect(subscriber.command_started_events('find').length).to eq(2)
end
end
context 'when transaction has a different read preference' do
it 'performs two queries' do
collection.find.to_a
session = client.start_session
session.with_transaction(
read: { mode: :primary }
) do
collection.find({}, session: session).to_a
end
expect(subscriber.command_started_events('find').length).to eq(2)
end
end
context 'when transaction is committed' do
it 'clears the cache' do
session = client.start_session
session.with_transaction do
collection.insert_one({ test: 1 }, session: session)
collection.insert_one({ test: 2 }, session: session)
expect(collection.find({}, session: session).to_a.length).to eq(2)
expect(collection.find({}, session: session).to_a.length).to eq(2)
# The driver caches the queries within the transaction
expect(subscriber.command_started_events('find').length).to eq(1)
session.commit_transaction
end
expect(collection.find.to_a.length).to eq(2)
# The driver clears the cache and runs the query again
expect(subscriber.command_started_events('find').length).to eq(2)
end
end
context 'when transaction is aborted' do
it 'clears the cache' do
session = client.start_session
session.with_transaction do
collection.insert_one({ test: 1 }, session: session)
collection.insert_one({ test: 2 }, session: session)
expect(collection.find({}, session: session).to_a.length).to eq(2)
expect(collection.find({}, session: session).to_a.length).to eq(2)
# The driver caches the queries within the transaction
expect(subscriber.command_started_events('find').length).to eq(1)
session.abort_transaction
end
expect(collection.find.to_a.length).to eq(0)
# The driver clears the cache and runs the query again
expect(subscriber.command_started_events('find').length).to eq(2)
end
end
end
context 'with low-level API' do
context 'when transaction is committed' do
it 'clears the cache' do
session = client.start_session
session.start_transaction
collection.insert_one({ test: 1 }, session: session)
collection.insert_one({ test: 2 }, session: session)
expect(collection.find({}, session: session).to_a.length).to eq(2)
expect(collection.find({}, session: session).to_a.length).to eq(2)
# The driver caches the queries within the transaction
expect(subscriber.command_started_events('find').length).to eq(1)
session.commit_transaction
expect(collection.find.to_a.length).to eq(2)
# The driver clears the cache and runs the query again
expect(subscriber.command_started_events('find').length).to eq(2)
end
end
context 'when transaction is aborted' do
it 'clears the cache' do
session = client.start_session
session.start_transaction
collection.insert_one({ test: 1 }, session: session)
collection.insert_one({ test: 2 }, session: session)
expect(collection.find({}, session: session).to_a.length).to eq(2)
expect(collection.find({}, session: session).to_a.length).to eq(2)
# The driver caches the queries within the transaction
expect(subscriber.command_started_events('find').length).to eq(1)
session.abort_transaction
expect(collection.find.to_a.length).to eq(0)
# The driver clears the cache and runs the query again
expect(subscriber.command_started_events('find').length).to eq(2)
end
end
end
end
end
|
