e55a606423
Add metadata-only counterparts to ::database, ::keyspace, and ::table. Apart from being metadata-only objects suitable for the coordinator, the new types are also type-erased and so they can be mocked without being linked to ::database and friends. We use a single abstract class to mediate between data_dictionary objects and the objects they represent (data_dictionary::impl). This makes the data_dictionary objects very lightweight - they only contain a pointer to the impl object (of which only one needs to be instantiated), and a reference to the object that is represented. This allows these objects to be easily passed by value. The abstraction is leaky: in one place it is outright breached with data_dictionary::database::real_database() that returns a ::database reference. This is used so that we can perform the transition incrementally. Another place is that one of the methods returns a secondary_index_manager, which in turn grants access to the real objects. This will be addressed later, probably by type erasing as well. This patch only contains the interface, and no implementation. It is somewhat messy since it mimics the years-old evolution of the real objects, but maybe it will be easier to improve it now.
298 lines
8.5 KiB
C++
298 lines
8.5 KiB
C++
/*
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* Copyright (C) 2021-present ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "data_dictionary.hh"
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#include "impl.hh"
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#include "user_types_metadata.hh"
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#include "keyspace_metadata.hh"
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#include "schema.hh"
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#include <fmt/core.h>
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#include <ostream>
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#include <boost/range/adaptor/map.hpp>
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#include <boost/range/adaptor/filtered.hpp>
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namespace data_dictionary {
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schema_ptr
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table::schema() const {
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return _ops->get_table_schema(*this);
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}
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const std::vector<view_ptr>&
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table::views() const {
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return _ops->get_table_views(*this);
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}
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const secondary_index::secondary_index_manager&
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table::get_index_manager() const {
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return _ops->get_index_manager(*this);
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}
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lw_shared_ptr<keyspace_metadata>
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keyspace::metadata() const {
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return _ops->get_keyspace_metadata(*this);
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}
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const user_types_metadata&
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keyspace::user_types() const {
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return metadata()->user_types();
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}
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const locator::abstract_replication_strategy&
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keyspace::get_replication_strategy() const {
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return _ops->get_replication_strategy(*this);
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}
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std::optional<keyspace>
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database::try_find_keyspace(std::string_view name) const {
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return _ops->try_find_keyspace(*this, name);
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}
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bool
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database::has_keyspace(std::string_view name) const {
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return bool(try_find_keyspace(name));
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}
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keyspace
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database::find_keyspace(std::string_view name) const {
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auto ks = try_find_keyspace(name);
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if (!ks) {
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throw no_such_keyspace(name);
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}
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return *ks;
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}
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std::optional<table>
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database::try_find_table(std::string_view ks, std::string_view table) const {
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return _ops->try_find_table(*this, ks, table);
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}
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table
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database::find_table(std::string_view ks, std::string_view table) const {
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auto t = try_find_table(ks, table);
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if (!t) {
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throw no_such_column_family(ks, table);
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}
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return *t;
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}
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std::optional<table>
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database::try_find_table(utils::UUID id) const {
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return _ops->try_find_table(*this, id);
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}
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table
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database::find_column_family(utils::UUID uuid) const {
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auto t = try_find_table(uuid);
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if (!t) {
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throw no_such_column_family(uuid);
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}
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return *t;
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}
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schema_ptr
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database::find_schema(std::string_view ks, std::string_view table) const {
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return find_table(ks, table).schema();
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}
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schema_ptr
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database::find_schema(utils::UUID uuid) const {
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return find_column_family(uuid).schema();
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}
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bool
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database::has_schema(std::string_view ks_name, std::string_view cf_name) const {
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return bool(try_find_table(ks_name, cf_name));
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}
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table
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database::find_column_family(schema_ptr s) const {
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return find_column_family(s->id());
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}
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schema_ptr
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database::find_indexed_table(std::string_view ks_name, std::string_view index_name) const {
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return _ops->find_indexed_table(*this, ks_name, index_name);
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}
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sstring
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database::get_available_index_name(std::string_view ks_name, std::string_view table_name,
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std::optional<sstring> index_name_root) const {
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return _ops->get_available_index_name(*this, ks_name, table_name, index_name_root);
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}
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std::set<sstring>
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database::existing_index_names(std::string_view ks_name, std::string_view cf_to_exclude) const {
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return _ops->existing_index_names(*this, ks_name, cf_to_exclude);
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}
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schema_ptr
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database::get_cdc_base_table(sstring_view ks_name, std::string_view table_name) const {
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return get_cdc_base_table(*find_table(ks_name, table_name).schema());
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}
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schema_ptr
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database::get_cdc_base_table(const schema& s) const {
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return _ops->get_cdc_base_table(*this, s);
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}
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const db::extensions&
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database::extensions() const {
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return _ops->get_extensions(*this);
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}
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const gms::feature_service&
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database::features() const {
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return _ops->get_features(*this);
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}
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const db::config&
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database::get_config() const {
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return _ops->get_config(*this);
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}
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::database&
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database::real_database() const {
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return _ops->real_database(*this);
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}
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impl::~impl() = default;
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keyspace_metadata::keyspace_metadata(std::string_view name,
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std::string_view strategy_name,
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locator::replication_strategy_config_options strategy_options,
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bool durable_writes,
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std::vector<schema_ptr> cf_defs)
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: keyspace_metadata(name,
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strategy_name,
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std::move(strategy_options),
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durable_writes,
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std::move(cf_defs),
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user_types_metadata{}) { }
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keyspace_metadata::keyspace_metadata(std::string_view name,
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std::string_view strategy_name,
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locator::replication_strategy_config_options strategy_options,
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bool durable_writes,
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std::vector<schema_ptr> cf_defs,
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user_types_metadata user_types)
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: _name{name}
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, _strategy_name{locator::abstract_replication_strategy::to_qualified_class_name(strategy_name.empty() ? "NetworkTopologyStrategy" : strategy_name)}
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, _strategy_options{std::move(strategy_options)}
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, _durable_writes{durable_writes}
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, _user_types{std::move(user_types)}
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{
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for (auto&& s : cf_defs) {
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_cf_meta_data.emplace(s->cf_name(), s);
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}
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}
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void keyspace_metadata::validate(const locator::topology& topology) const {
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using namespace locator;
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abstract_replication_strategy::validate_replication_strategy(name(), strategy_name(), strategy_options(), topology);
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}
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lw_shared_ptr<keyspace_metadata>
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keyspace_metadata::new_keyspace(std::string_view name,
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std::string_view strategy_name,
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locator::replication_strategy_config_options options,
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bool durables_writes,
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std::vector<schema_ptr> cf_defs)
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{
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return ::make_lw_shared<keyspace_metadata>(name, strategy_name, options, durables_writes, cf_defs);
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}
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void keyspace_metadata::add_user_type(const user_type ut) {
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_user_types.add_type(ut);
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}
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void keyspace_metadata::remove_user_type(const user_type ut) {
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_user_types.remove_type(ut);
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}
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std::vector<schema_ptr> keyspace_metadata::tables() const {
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return boost::copy_range<std::vector<schema_ptr>>(_cf_meta_data
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| boost::adaptors::map_values
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| boost::adaptors::filtered([] (auto&& s) { return !s->is_view(); }));
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}
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std::vector<view_ptr> keyspace_metadata::views() const {
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return boost::copy_range<std::vector<view_ptr>>(_cf_meta_data
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| boost::adaptors::map_values
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| boost::adaptors::filtered(std::mem_fn(&schema::is_view))
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| boost::adaptors::transformed([] (auto&& s) { return view_ptr(s); }));
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}
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no_such_keyspace::no_such_keyspace(std::string_view ks_name)
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: runtime_error{format("Can't find a keyspace {}", ks_name)}
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{
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}
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no_such_column_family::no_such_column_family(const utils::UUID& uuid)
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: runtime_error{format("Can't find a column family with UUID {}", uuid)}
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{
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}
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no_such_column_family::no_such_column_family(std::string_view ks_name, std::string_view cf_name)
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: runtime_error{format("Can't find a column family {} in keyspace {}", cf_name, ks_name)}
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{
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}
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no_such_column_family::no_such_column_family(std::string_view ks_name, const utils::UUID& uuid)
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: runtime_error{format("Can't find a column family with UUID {} in keyspace {}", uuid, ks_name)}
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{
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}
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std::ostream& operator<<(std::ostream& os, const keyspace_metadata& m) {
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os << "KSMetaData{";
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os << "name=" << m._name;
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os << ", strategyClass=" << m._strategy_name;
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os << ", strategyOptions={";
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int n = 0;
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for (auto& p : m._strategy_options) {
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if (n++ != 0) {
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os << ", ";
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}
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os << p.first << "=" << p.second;
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}
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os << "}";
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os << ", cfMetaData={";
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n = 0;
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for (auto& p : m._cf_meta_data) {
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if (n++ != 0) {
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os << ", ";
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}
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os << p.first << "=" << p.second;
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}
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os << "}";
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os << ", durable_writes=" << m._durable_writes;
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os << ", userTypes=" << m._user_types;
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os << "}";
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return os;
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}
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std::ostream& operator<<(std::ostream& os, const user_types_metadata& m) {
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os << "org.apache.cassandra.config.UTMetaData@" << &m;
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return os;
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}
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}
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