fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
/*
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* Copyright (C) 2019-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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/*
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* This module manages CDC log tables. It contains facilities used to:
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* - perform schema changes to CDC log tables correspondingly when base tables are changed,
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* - perform writes to CDC log tables correspondingly when writes to base tables are made.
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*/
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#pragma once
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#include <functional>
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#include <optional>
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#include <map>
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#include <string>
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#include <vector>
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#include <seastar/core/future.hh>
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#include <seastar/core/lowres_clock.hh>
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#include <seastar/core/shared_ptr.hh>
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#include <seastar/core/sstring.hh>
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#include "exceptions/exceptions.hh"
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#include "timestamp.hh"
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#include "tracing/trace_state.hh"
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#include "utils/UUID.hh"
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class schema;
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using schema_ptr = seastar::lw_shared_ptr<const schema>;
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namespace locator {
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class token_metadata;
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} // namespace locator
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namespace service {
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class migration_notifier;
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class storage_proxy;
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class query_state;
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} // namespace service
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class mutation;
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class partition_key;
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namespace replica {
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class database;
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}
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namespace cdc {
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struct operation_result_tracker;
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class db_context;
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class metadata;
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/// \brief CDC service, responsible for schema listeners
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///
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/// CDC service will listen for schema changes and iff CDC is enabled/changed
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/// create/modify/delete corresponding log tables etc as part of the schema change.
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///
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class cdc_service final : public async_sharded_service<cdc::cdc_service> {
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class impl;
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std::unique_ptr<impl> _impl;
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public:
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future<> stop();
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cdc_service(service::storage_proxy&, cdc::metadata&, service::migration_notifier&);
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cdc_service(db_context);
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~cdc_service();
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// If any of the mutations are cdc enabled, optionally selects preimage, and adds the
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// appropriate augments to set the log entries.
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// Iff post-image is enabled for any of these, a non-empty callback is also
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// returned to be invoked post the mutation query.
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future<std::tuple<std::vector<mutation>, lw_shared_ptr<operation_result_tracker>>> augment_mutation_call(
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lowres_clock::time_point timeout,
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std::vector<mutation>&& mutations,
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tracing::trace_state_ptr tr_state,
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db::consistency_level write_cl
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);
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bool needs_cdc_augmentation(const std::vector<mutation>&) const;
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};
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struct db_context final {
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service::storage_proxy& _proxy;
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service::migration_notifier& _migration_notifier;
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cdc::metadata& _cdc_metadata;
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db_context(service::storage_proxy& proxy, cdc::metadata& cdc_meta, service::migration_notifier& notifier) noexcept
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: _proxy(proxy), _migration_notifier(notifier), _cdc_metadata(cdc_meta) {}
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};
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// cdc log table operation
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enum class operation : int8_t {
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// note: these values will eventually be read by a third party, probably not privvy to this
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// enum decl, so don't change the constant values (or the datatype).
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pre_image = 0, update = 1, insert = 2, row_delete = 3, partition_delete = 4,
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range_delete_start_inclusive = 5, range_delete_start_exclusive = 6, range_delete_end_inclusive = 7, range_delete_end_exclusive = 8,
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post_image = 9,
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};
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bool is_log_for_some_table(const replica::database& db, const sstring& ks_name, const std::string_view& table_name);
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schema_ptr get_base_table(const replica::database&, const schema&);
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schema_ptr get_base_table(const replica::database&, sstring_view, std::string_view);
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seastar::sstring base_name(std::string_view log_name);
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seastar::sstring log_name(std::string_view table_name);
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seastar::sstring log_data_column_name(std::string_view column_name);
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seastar::sstring log_meta_column_name(std::string_view column_name);
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bytes log_data_column_name_bytes(const bytes& column_name);
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bytes log_meta_column_name_bytes(const bytes& column_name);
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seastar::sstring log_data_column_deleted_name(std::string_view column_name);
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bytes log_data_column_deleted_name_bytes(const bytes& column_name);
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seastar::sstring log_data_column_deleted_elements_name(std::string_view column_name);
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bytes log_data_column_deleted_elements_name_bytes(const bytes& column_name);
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bool is_cdc_metacolumn_name(const sstring& name);
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utils::UUID generate_timeuuid(api::timestamp_type t);
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} // namespace cdc
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