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8bcd23fa02
The patch series moves the rest of internal ddl users to do schema change over raft (if enabled). After that series only tests are left using old API. * 'gleb/raft-schema-rest-v6' of github.com:scylladb/scylla-dev: (33 commits) migration_manager: drop no longer used functions system_distributed_keyspace: move schema creation code to use raft auth: move table creation code to use raft auth: move keyspace creation code to use raft table_helper: move schema creation code to use raft cql3: make query_processor inherit from peering_sharded_service table_helper: make setup_table() static table_helper: co-routinize setup_keyspace() redis: move schema creation code to go through raft thrift: move system_update_column_family() to raft thrift: authenticate a statement before verifying in system_update_column_family() thrift: co-routinize system_update_column_family() thrift: move system_update_keyspace() to raft thrift: authenticate a statement before verifying in system_update_keyspace() thrift: co-routinize system_update_keyspace() thrift: move system_drop_keyspace() to raft thrift: authenticate a statement before verifying in system_drop_keyspace() thrift: co-routinize system_drop_keyspace() thrift: move system_add_keyspace() to raft thrift: co-routinize system_add_keyspace() ...
246 lines
12 KiB
C++
246 lines
12 KiB
C++
/*
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* Copyright 2019-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 Affero 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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#pragma once
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#include <seastar/core/future.hh>
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#include <seastar/http/httpd.hh>
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#include "seastarx.hh"
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#include <seastar/json/json_elements.hh>
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#include <seastar/core/sharded.hh>
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#include "service/migration_manager.hh"
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#include "service/client_state.hh"
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#include "service_permit.hh"
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#include "db/timeout_clock.hh"
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#include "alternator/error.hh"
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#include "stats.hh"
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#include "utils/rjson.hh"
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namespace db {
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class system_distributed_keyspace;
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}
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namespace query {
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class partition_slice;
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class result;
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}
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namespace cql3::selection {
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class selection;
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}
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namespace service {
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class storage_proxy;
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}
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namespace cdc {
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class metadata;
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}
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namespace gms {
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class gossiper;
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}
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namespace alternator {
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class rmw_operation;
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struct make_jsonable : public json::jsonable {
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rjson::value _value;
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public:
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explicit make_jsonable(rjson::value&& value);
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std::string to_json() const override;
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};
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/**
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* Make return type for serializing the object "streamed",
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* i.e. direct to HTTP output stream. Note: only useful for
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* (very) large objects as there are overhead issues with this
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* as well, but for massive lists of return objects this can
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* help avoid large allocations/many re-allocs
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*/
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json::json_return_type make_streamed(rjson::value&&);
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struct json_string : public json::jsonable {
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std::string _value;
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public:
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explicit json_string(std::string&& value);
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std::string to_json() const override;
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};
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namespace parsed {
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class path;
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};
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const std::map<sstring, sstring>& get_tags_of_table(schema_ptr schema);
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std::optional<std::string> find_tag(const schema& s, const sstring& tag);
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future<> update_tags(service::migration_manager& mm, schema_ptr schema, std::map<sstring, sstring>&& tags_map);
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schema_ptr get_table(service::storage_proxy& proxy, const rjson::value& request);
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// An attribute_path_map object is used to hold data for various attributes
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// paths (parsed::path) in a hierarchy of attribute paths. Each attribute path
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// has a root attribute, and then modified by member and index operators -
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// for example in "a.b[2].c" we have "a" as the root, then ".b" member, then
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// "[2]" index, and finally ".c" member.
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// Data can be added to an attribute_path_map using the add() function, but
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// requires that attributes with data not be *overlapping* or *conflicting*:
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//
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// 1. Two attribute paths which are identical or an ancestor of one another
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// are considered *overlapping* and not allowed. If a.b.c has data,
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// we can't add more data in a.b.c or any of its descendants like a.b.c.d.
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//
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// 2. Two attribute paths which need the same parent to have both a member and
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// an index are considered *conflicting* and not allowed. E.g., if a.b has
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// data, you can't add a[1]. The meaning of adding both would be that the
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// attribute a is both a map and an array, which isn't sensible.
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//
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// These two requirements are common to the two places where Alternator uses
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// this abstraction to describe how a hierarchical item is to be transformed:
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//
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// 1. In ProjectExpression: for filtering from a full top-level attribute
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// only the parts for which user asked in ProjectionExpression.
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//
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// 2. In UpdateExpression: for taking the previous value of a top-level
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// attribute, and modifying it based on the instructions in the user
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// wrote in UpdateExpression.
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template<typename T>
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class attribute_path_map_node {
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public:
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using data_t = T;
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// We need the extra unique_ptr<> here because libstdc++ unordered_map
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// doesn't work with incomplete types :-(
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using members_t = std::unordered_map<std::string, std::unique_ptr<attribute_path_map_node<T>>>;
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// The indexes list is sorted because DynamoDB requires handling writes
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// beyond the end of a list in index order.
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using indexes_t = std::map<unsigned, std::unique_ptr<attribute_path_map_node<T>>>;
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// The prohibition on "overlap" and "conflict" explained above means
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// That only one of data, members or indexes is non-empty.
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std::optional<std::variant<data_t, members_t, indexes_t>> _content;
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bool is_empty() const { return !_content; }
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bool has_value() const { return _content && std::holds_alternative<data_t>(*_content); }
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bool has_members() const { return _content && std::holds_alternative<members_t>(*_content); }
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bool has_indexes() const { return _content && std::holds_alternative<indexes_t>(*_content); }
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// get_members() assumes that has_members() is true
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members_t& get_members() { return std::get<members_t>(*_content); }
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const members_t& get_members() const { return std::get<members_t>(*_content); }
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indexes_t& get_indexes() { return std::get<indexes_t>(*_content); }
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const indexes_t& get_indexes() const { return std::get<indexes_t>(*_content); }
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T& get_value() { return std::get<T>(*_content); }
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const T& get_value() const { return std::get<T>(*_content); }
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};
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template<typename T>
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using attribute_path_map = std::unordered_map<std::string, attribute_path_map_node<T>>;
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using attrs_to_get_node = attribute_path_map_node<std::monostate>;
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using attrs_to_get = attribute_path_map<std::monostate>;
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class executor : public peering_sharded_service<executor> {
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gms::gossiper& _gossiper;
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service::storage_proxy& _proxy;
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service::migration_manager& _mm;
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db::system_distributed_keyspace& _sdks;
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cdc::metadata& _cdc_metadata;
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// An smp_service_group to be used for limiting the concurrency when
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// forwarding Alternator request between shards - if necessary for LWT.
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smp_service_group _ssg;
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public:
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using client_state = service::client_state;
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using request_return_type = std::variant<json::json_return_type, api_error>;
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stats _stats;
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static constexpr auto ATTRS_COLUMN_NAME = ":attrs";
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static constexpr auto KEYSPACE_NAME_PREFIX = "alternator_";
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static constexpr std::string_view INTERNAL_TABLE_PREFIX = ".scylla.alternator.";
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executor(gms::gossiper& gossiper, service::storage_proxy& proxy, service::migration_manager& mm, db::system_distributed_keyspace& sdks, cdc::metadata& cdc_metadata, smp_service_group ssg)
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: _gossiper(gossiper), _proxy(proxy), _mm(mm), _sdks(sdks), _cdc_metadata(cdc_metadata), _ssg(ssg) {}
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future<request_return_type> create_table(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> describe_table(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> delete_table(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> update_table(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> put_item(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> get_item(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> delete_item(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> update_item(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> list_tables(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> scan(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> describe_endpoints(client_state& client_state, service_permit permit, rjson::value request, std::string host_header);
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future<request_return_type> batch_write_item(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> batch_get_item(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> query(client_state& client_state, tracing::trace_state_ptr trace_state, service_permit permit, rjson::value request);
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future<request_return_type> tag_resource(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> untag_resource(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> list_tags_of_resource(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> update_time_to_live(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> describe_time_to_live(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> list_streams(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> describe_stream(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> get_shard_iterator(client_state& client_state, service_permit permit, rjson::value request);
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future<request_return_type> get_records(client_state& client_state, tracing::trace_state_ptr, service_permit permit, rjson::value request);
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future<> start();
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future<> stop() { return make_ready_future<>(); }
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static sstring table_name(const schema&);
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static db::timeout_clock::time_point default_timeout();
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static void set_default_timeout(db::timeout_clock::duration timeout);
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private:
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static db::timeout_clock::duration s_default_timeout;
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public:
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static schema_ptr find_table(service::storage_proxy&, const rjson::value& request);
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private:
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friend class rmw_operation;
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static bool is_alternator_keyspace(const sstring& ks_name);
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static sstring make_keyspace_name(const sstring& table_name);
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static void describe_key_schema(rjson::value& parent, const schema&, std::unordered_map<std::string,std::string> * = nullptr);
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static void describe_key_schema(rjson::value& parent, const schema& schema, std::unordered_map<std::string,std::string>&);
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public:
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static std::optional<rjson::value> describe_single_item(schema_ptr,
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const query::partition_slice&,
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const cql3::selection::selection&,
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const query::result&,
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const attrs_to_get&);
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static void describe_single_item(const cql3::selection::selection&,
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const std::vector<bytes_opt>&,
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const attrs_to_get&,
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rjson::value&,
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bool = false);
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static void add_stream_options(const rjson::value& stream_spec, schema_builder&, service::storage_proxy& sp);
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static void supplement_table_info(rjson::value& descr, const schema& schema, service::storage_proxy& sp);
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static void supplement_table_stream_info(rjson::value& descr, const schema& schema, service::storage_proxy& sp);
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};
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}
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