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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe ClickHouse::MigrationSupport::MigrationContext,
click_house: :without_migrations, feature_category: :database do
include ClickHouseTestHelpers
# We don't need to delete data since we don't modify Postgres data
self.use_transactional_tests = false
let(:connection) { ::ClickHouse::Connection.new(:main) }
let(:schema_migration) { ClickHouse::MigrationSupport::SchemaMigration.new(connection) }
let(:migrations_base_dir) { 'click_house/migrations' }
let(:migrations_dir) { expand_fixture_path("#{migrations_base_dir}/#{migrations_dirname}") }
let(:migration_context) { described_class.new(connection, migrations_dir, schema_migration) }
let(:target_version) { nil }
after do
unload_click_house_migration_classes(expand_fixture_path(migrations_base_dir))
end
describe 'performs migrations' do
include ExclusiveLeaseHelpers
subject(:migration) { migrate(migration_context, target_version) }
describe 'when creating a table' do
let(:migrations_dirname) { 'plain_table_creation' }
let(:lease_key) { 'click_house:migrations' }
let(:lease_timeout) { 1.hour }
it 'executes migration through ClickHouse::MigrationSupport::ExclusiveLock.execute_migration' do
expect(ClickHouse::MigrationSupport::ExclusiveLock).to receive(:execute_migration)
# Test that not running execute_migration will not execute migrations
expect { migration }.not_to change { active_schema_migrations_count }
end
it 'creates a table' do
expect(ClickHouse::MigrationSupport::ExclusiveLock).to receive(:execute_migration).and_call_original
expect_to_obtain_exclusive_lease(lease_key, timeout: lease_timeout)
expect { migration }.to change { active_schema_migrations_count }.from(0).to(1)
table_schema = describe_table('some')
expect(schema_migrations).to contain_exactly(a_hash_including(version: '1', active: 1))
expect(table_schema).to match({
id: a_hash_including(type: 'UInt64'),
date: a_hash_including(type: 'Date')
})
end
context 'when a migration is already running' do
let(:migration_name) { 'create_some_table' }
before do
stub_exclusive_lease_taken(lease_key)
end
it 'raises error after timeout when migration is executing concurrently' do
expect { migration }.to raise_error(ClickHouse::MigrationSupport::Errors::LockError)
.and not_change { active_schema_migrations_count }
end
end
end
describe 'when dropping a table' do
let(:migrations_dirname) { 'drop_table' }
let(:target_version) { 2 }
it 'drops table' do
migrate(migration_context, 1)
expect(table_names).to include('some')
migration
expect(table_names).not_to include('some')
end
end
context 'when a migration raises an error' do
let(:migrations_dirname) { 'migration_with_error' }
it 'passes the error to caller as a StandardError' do
expect { migration }.to raise_error StandardError,
"An error has occurred, all later migrations canceled:\n\nA migration error happened"
expect(schema_migrations).to be_empty
end
end
context 'when connecting to not-existing database' do
let(:migrations_dirname) { 'plain_table_creation' }
let(:connection) { ::ClickHouse::Connection.new(:unknown_database) }
it 'raises ConfigurationError' do
expect { migration }.to raise_error ClickHouse::Client::ConfigurationError,
"The database 'unknown_database' is not configured"
end
end
context 'when target_version is incorrect' do
let(:target_version) { 2 }
let(:migrations_dirname) { 'plain_table_creation' }
it 'raises UnknownMigrationVersionError' do
expect { migration }.to raise_error ClickHouse::MigrationSupport::Errors::UnknownMigrationVersionError
expect(active_schema_migrations_count).to eq 0
end
end
context 'when migrations with duplicate name exist' do
let(:migrations_dirname) { 'duplicate_name' }
it 'raises DuplicateMigrationNameError' do
expect { migration }.to raise_error ClickHouse::MigrationSupport::Errors::DuplicateMigrationNameError
expect(active_schema_migrations_count).to eq 0
end
end
context 'when migrations with duplicate version exist' do
let(:migrations_dirname) { 'duplicate_version' }
it 'raises DuplicateMigrationVersionError' do
expect { migration }.to raise_error ClickHouse::MigrationSupport::Errors::DuplicateMigrationVersionError
expect(active_schema_migrations_count).to eq 0
end
end
end
describe 'performs rollbacks' do
subject(:migration) { rollback(migration_context, target_version) }
before do
# Ensure that all migrations are up
migrate(migration_context, nil)
end
context 'when down method is present' do
let(:migrations_dirname) { 'table_creation_with_down_method' }
context 'when specifying target_version' do
it 'removes migrations and performs down method' do
expect(table_names).to include('some', 'another')
# test that target_version is prioritized over step
expect { rollback(migration_context, 1, 10000) }.to change { active_schema_migrations_count }.from(2).to(1)
expect(table_names).not_to include('another')
expect(table_names).to include('some')
expect(schema_migrations).to contain_exactly(
a_hash_including(version: '1', active: 1),
a_hash_including(version: '2', active: 0)
)
expect { rollback(migration_context, nil) }.to change { active_schema_migrations_count }.to(0)
expect(table_names).not_to include('some', 'another')
expect(schema_migrations).to contain_exactly(
a_hash_including(version: '1', active: 0),
a_hash_including(version: '2', active: 0)
)
end
end
context 'when specifying step' do
it 'removes migrations and performs down method' do
expect(table_names).to include('some', 'another')
expect { rollback(migration_context, nil, 1) }.to change { active_schema_migrations_count }.from(2).to(1)
expect(table_names).not_to include('another')
expect(table_names).to include('some')
expect { rollback(migration_context, nil, 2) }.to change { active_schema_migrations_count }.to(0)
expect(table_names).not_to include('some', 'another')
end
end
end
context 'when down method is missing' do
let(:migrations_dirname) { 'plain_table_creation' }
let(:target_version) { 0 }
it 'removes migration ignoring missing down method' do
expect { migration }.to change { active_schema_migrations_count }.from(1).to(0)
.and not_change { table_names & %w[some] }.from(%w[some])
end
end
context 'when target_version is incorrect' do
let(:target_version) { -1 }
let(:migrations_dirname) { 'plain_table_creation' }
it 'raises UnknownMigrationVersionError' do
expect { migration }.to raise_error ClickHouse::MigrationSupport::Errors::UnknownMigrationVersionError
expect(active_schema_migrations_count).to eq 1
end
end
end
end
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