00de63c920
syntactical sugar + "process" for internal, similar to execute_internal, but allowing querying the whole cluster, and optional statement caching.
489 lines
19 KiB
C++
489 lines
19 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright 2015 Cloudius Systems
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*
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* Modified by Cloudius Systems
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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 "cql3/query_processor.hh"
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#include "cql3/CqlParser.hpp"
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#include "cql3/error_collector.hh"
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#include "cql3/statements/batch_statement.hh"
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#include "transport/messages/result_message.hh"
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#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1
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#include <cryptopp/md5.h>
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namespace cql3 {
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using namespace statements;
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using namespace transport::messages;
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logging::logger log("query_processor");
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distributed<query_processor> _the_query_processor;
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const sstring query_processor::CQL_VERSION = "3.2.0";
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class query_processor::internal_state {
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service::query_state _qs;
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public:
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internal_state()
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: _qs(service::client_state{service::client_state::internal_tag()}) {
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}
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operator service::query_state&() {
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return _qs;
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}
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operator const service::query_state&() const {
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return _qs;
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}
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operator service::client_state&() {
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return _qs.get_client_state();
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}
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operator const service::client_state&() const {
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return _qs.get_client_state();
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}
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api::timestamp_type next_timestamp() {
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return _qs.get_client_state().get_timestamp();
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}
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};
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api::timestamp_type query_processor::next_timestamp() {
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return _internal_state->next_timestamp();
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}
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query_processor::query_processor(distributed<service::storage_proxy>& proxy,
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distributed<database>& db)
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: _migration_subscriber{std::make_unique<migration_subscriber>(this)}
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, _proxy(proxy)
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, _db(db)
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, _internal_state(new internal_state())
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{
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service::get_local_migration_manager().register_listener(_migration_subscriber.get());
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}
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query_processor::~query_processor()
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{}
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future<> query_processor::stop()
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{
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service::get_local_migration_manager().unregister_listener(_migration_subscriber.get());
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return make_ready_future<>();
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}
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future<::shared_ptr<result_message>>
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query_processor::process(const sstring_view& query_string, service::query_state& query_state, query_options& options)
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{
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log.trace("process: \"{}\"", query_string);
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auto p = get_statement(query_string, query_state.get_client_state());
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options.prepare(p->bound_names);
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auto cql_statement = p->statement;
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if (cql_statement->get_bound_terms() != options.get_values_count()) {
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throw exceptions::invalid_request_exception("Invalid amount of bind variables");
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}
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warn(unimplemented::cause::METRICS);
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#if 0
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if (!queryState.getClientState().isInternal)
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metrics.regularStatementsExecuted.inc();
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#endif
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return process_statement(std::move(cql_statement), query_state, options);
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}
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future<::shared_ptr<result_message>>
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query_processor::process_statement(::shared_ptr<cql_statement> statement, service::query_state& query_state,
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const query_options& options)
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{
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#if 0
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logger.trace("Process {} @CL.{}", statement, options.getConsistency());
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#endif
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auto& client_state = query_state.get_client_state();
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statement->check_access(client_state);
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statement->validate(_proxy, client_state);
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future<::shared_ptr<transport::messages::result_message>> fut = make_ready_future<::shared_ptr<transport::messages::result_message>>();
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if (query_state.get_client_state()._is_internal) {
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fut = statement->execute_internal(_proxy, query_state, options);
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} else {
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fut = statement->execute(_proxy, query_state, options);
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}
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return fut.then([statement] (auto msg) {
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if (msg) {
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return make_ready_future<::shared_ptr<result_message>>(std::move(msg));
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}
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return make_ready_future<::shared_ptr<result_message>>(
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::make_shared<result_message::void_message>());
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});
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}
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future<::shared_ptr<transport::messages::result_message::prepared>>
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query_processor::prepare(const std::experimental::string_view& query_string, service::query_state& query_state)
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{
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auto& client_state = query_state.get_client_state();
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return prepare(query_string, client_state, client_state.is_thrift());
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}
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future<::shared_ptr<transport::messages::result_message::prepared>>
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query_processor::prepare(const std::experimental::string_view& query_string, const service::client_state& client_state, bool for_thrift)
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{
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auto existing = get_stored_prepared_statement(query_string, client_state.get_raw_keyspace(), for_thrift);
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if (existing) {
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return make_ready_future<::shared_ptr<transport::messages::result_message::prepared>>(existing);
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}
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auto prepared = get_statement(query_string, client_state);
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auto bound_terms = prepared->statement->get_bound_terms();
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if (bound_terms > std::numeric_limits<uint16_t>::max()) {
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throw exceptions::invalid_request_exception(sprint("Too many markers(?). %d markers exceed the allowed maximum of %d", bound_terms, std::numeric_limits<uint16_t>::max()));
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}
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assert(bound_terms == prepared->bound_names.size());
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return store_prepared_statement(query_string, client_state.get_raw_keyspace(), std::move(prepared), for_thrift);
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}
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::shared_ptr<transport::messages::result_message::prepared>
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query_processor::get_stored_prepared_statement(const std::experimental::string_view& query_string, const sstring& keyspace, bool for_thrift)
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{
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if (for_thrift) {
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throw std::runtime_error(sprint("%s not implemented", __PRETTY_FUNCTION__));
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#if 0
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Integer thriftStatementId = computeThriftId(queryString, keyspace);
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ParsedStatement.Prepared existing = thriftPreparedStatements.get(thriftStatementId);
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return existing == null ? null : ResultMessage.Prepared.forThrift(thriftStatementId, existing.boundNames);
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#endif
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} else {
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auto statement_id = compute_id(query_string, keyspace);
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auto it = _prepared_statements.find(statement_id);
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if (it == _prepared_statements.end()) {
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return ::shared_ptr<result_message::prepared>();
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}
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return ::make_shared<result_message::prepared>(statement_id, it->second);
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}
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}
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future<::shared_ptr<transport::messages::result_message::prepared>>
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query_processor::store_prepared_statement(const std::experimental::string_view& query_string, const sstring& keyspace,
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::shared_ptr<statements::parsed_statement::prepared> prepared, bool for_thrift)
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{
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#if 0
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// Concatenate the current keyspace so we don't mix prepared statements between keyspace (#5352).
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// (if the keyspace is null, queryString has to have a fully-qualified keyspace so it's fine.
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long statementSize = measure(prepared.statement);
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// don't execute the statement if it's bigger than the allowed threshold
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if (statementSize > MAX_CACHE_PREPARED_MEMORY)
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throw new InvalidRequestException(String.format("Prepared statement of size %d bytes is larger than allowed maximum of %d bytes.",
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statementSize,
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MAX_CACHE_PREPARED_MEMORY));
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#endif
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if (for_thrift) {
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throw std::runtime_error(sprint("%s not implemented", __PRETTY_FUNCTION__));
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#if 0
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Integer statementId = computeThriftId(queryString, keyspace);
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thriftPreparedStatements.put(statementId, prepared);
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return ResultMessage.Prepared.forThrift(statementId, prepared.boundNames);
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#endif
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} else {
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auto statement_id = compute_id(query_string, keyspace);
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_prepared_statements.emplace(statement_id, prepared);
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auto msg = ::make_shared<result_message::prepared>(statement_id, prepared);
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return make_ready_future<::shared_ptr<result_message::prepared>>(std::move(msg));
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}
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}
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void query_processor::invalidate_prepared_statement(bytes statement_id)
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{
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_prepared_statements.erase(statement_id);
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}
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static bytes md5_calculate(const std::experimental::string_view& s)
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{
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constexpr size_t size = CryptoPP::Weak1::MD5::DIGESTSIZE;
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CryptoPP::Weak::MD5 hash;
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unsigned char digest[size];
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hash.CalculateDigest(digest, reinterpret_cast<const unsigned char*>(s.data()), s.size());
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return std::move(bytes{reinterpret_cast<const int8_t*>(digest), size});
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}
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bytes query_processor::compute_id(const std::experimental::string_view& query_string, const sstring& keyspace)
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{
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sstring to_hash;
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if (!keyspace.empty()) {
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to_hash += keyspace;
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}
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to_hash += query_string.to_string();
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return md5_calculate(to_hash);
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}
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::shared_ptr<parsed_statement::prepared>
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query_processor::get_statement(const sstring_view& query, const service::client_state& client_state)
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{
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#if 0
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Tracing.trace("Parsing {}", queryStr);
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#endif
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::shared_ptr<parsed_statement> statement = parse_statement(query);
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// Set keyspace for statement that require login
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auto cf_stmt = dynamic_pointer_cast<cf_statement>(statement);
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if (cf_stmt) {
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cf_stmt->prepare_keyspace(client_state);
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}
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#if 0
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Tracing.trace("Preparing statement");
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#endif
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return statement->prepare(_db.local());
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}
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::shared_ptr<parsed_statement>
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query_processor::parse_statement(const sstring_view& query)
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{
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try {
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error_collector<cql3_parser::CqlLexer::RecognizerType> lexer_error_collector(query);
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error_collector<cql3_parser::CqlParser::RecognizerType> parser_error_collector(query);
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cql3_parser::CqlLexer::InputStreamType input{reinterpret_cast<const ANTLR_UINT8*>(query.begin()), ANTLR_ENC_UTF8, static_cast<ANTLR_UINT32>(query.size()), nullptr};
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cql3_parser::CqlLexer lexer{&input};
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lexer.set_error_listener(lexer_error_collector);
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cql3_parser::CqlParser::TokenStreamType tstream(ANTLR_SIZE_HINT, lexer.get_tokSource());
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cql3_parser::CqlParser parser{&tstream};
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parser.set_error_listener(parser_error_collector);
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auto statement = parser.query();
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lexer_error_collector.throw_first_syntax_error();
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parser_error_collector.throw_first_syntax_error();
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if (!statement) {
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throw exceptions::syntax_exception("Parsing failed");
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};
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return std::move(statement);
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} catch (const exceptions::recognition_exception& e) {
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throw exceptions::syntax_exception(sprint("Invalid or malformed CQL query string: %s", e.what()));
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} catch (const exceptions::cassandra_exception& e) {
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throw;
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} catch (const std::exception& e) {
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log.error("The statement: {} could not be parsed: {}", query, e.what());
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throw exceptions::syntax_exception(sprint("Failed parsing statement: [%s] reason: %s", query, e.what()));
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}
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}
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query_options query_processor::make_internal_options(
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::shared_ptr<statements::parsed_statement::prepared> p,
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const std::initializer_list<data_value>& values,
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db::consistency_level cl) {
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if (p->bound_names.size() != values.size()) {
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throw std::invalid_argument(sprint("Invalid number of values. Expecting %d but got %d", p->bound_names.size(), values.size()));
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}
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auto ni = p->bound_names.begin();
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std::vector<bytes_opt> bound_values;
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for (auto& v : values) {
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auto& n = *ni++;
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if (v.type() == bytes_type) {
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bound_values.push_back({value_cast<bytes>(v)});
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} else if (v.is_null()) {
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bound_values.push_back({});
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} else {
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bound_values.push_back({n->type->decompose(v)});
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}
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}
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return query_options(cl, bound_values);
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}
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::shared_ptr<statements::parsed_statement::prepared> query_processor::prepare_internal(
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const sstring& query_string) {
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auto& p = _internal_statements[query_string];
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if (p == nullptr) {
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auto np = parse_statement(query_string)->prepare(_db.local());
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np->statement->validate(_proxy, *_internal_state);
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p = std::move(np); // inserts it into map
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}
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return p;
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}
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future<::shared_ptr<untyped_result_set>> query_processor::execute_internal(
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const sstring& query_string,
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const std::initializer_list<data_value>& values) {
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if (log.is_enabled(logging::log_level::trace)) {
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log.trace("execute_internal: \"{}\" ({})", query_string, ::join(", ", values));
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}
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auto p = prepare_internal(query_string);
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return execute_internal(p, values);
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}
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future<::shared_ptr<untyped_result_set>> query_processor::execute_internal(
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::shared_ptr<statements::parsed_statement::prepared> p,
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const std::initializer_list<data_value>& values) {
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auto opts = make_internal_options(p, values);
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return do_with(std::move(opts),
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[this, p = std::move(p)](query_options & opts) {
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return p->statement->execute_internal(_proxy, *_internal_state, opts).then(
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[p](::shared_ptr<transport::messages::result_message> msg) {
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return make_ready_future<::shared_ptr<untyped_result_set>>(::make_shared<untyped_result_set>(msg));
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});
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});
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}
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future<::shared_ptr<untyped_result_set>> query_processor::process(
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const sstring& query_string,
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db::consistency_level cl, const std::initializer_list<data_value>& values, bool cache)
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{
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auto p = cache ? prepare_internal(query_string) : parse_statement(query_string)->prepare(_db.local());
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if (!cache) {
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p->statement->validate(_proxy, *_internal_state);
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}
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return process(p, cl, values);
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}
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future<::shared_ptr<untyped_result_set>> query_processor::process(
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::shared_ptr<statements::parsed_statement::prepared> p,
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db::consistency_level cl, const std::initializer_list<data_value>& values)
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{
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auto opts = make_internal_options(p, values, cl);
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return do_with(std::move(opts),
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[this, p = std::move(p)](query_options & opts) {
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return p->statement->execute(_proxy, *_internal_state, opts).then(
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[p](::shared_ptr<transport::messages::result_message> msg) {
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return make_ready_future<::shared_ptr<untyped_result_set>>(::make_shared<untyped_result_set>(msg));
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});
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});
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}
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future<::shared_ptr<transport::messages::result_message>>
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query_processor::process_batch(::shared_ptr<statements::batch_statement> batch, service::query_state& query_state, query_options& options) {
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auto& client_state = query_state.get_client_state();
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batch->check_access(client_state);
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batch->validate();
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batch->validate(_proxy, client_state);
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return batch->execute(_proxy, query_state, options);
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}
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query_processor::migration_subscriber::migration_subscriber(query_processor* qp)
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: _qp{qp}
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{
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}
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void query_processor::migration_subscriber::on_create_keyspace(const sstring& ks_name)
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{
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}
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void query_processor::migration_subscriber::on_create_column_family(const sstring& ks_name, const sstring& cf_name)
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{
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}
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void query_processor::migration_subscriber::on_create_user_type(const sstring& ks_name, const sstring& type_name)
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{
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}
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void query_processor::migration_subscriber::on_create_function(const sstring& ks_name, const sstring& function_name)
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{
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log.warn("{} event ignored", __func__);
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}
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void query_processor::migration_subscriber::on_create_aggregate(const sstring& ks_name, const sstring& aggregate_name)
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{
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log.warn("{} event ignored", __func__);
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}
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void query_processor::migration_subscriber::on_update_keyspace(const sstring& ks_name)
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{
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}
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void query_processor::migration_subscriber::on_update_column_family(const sstring& ks_name, const sstring& cf_name, bool columns_changed)
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{
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if (columns_changed) {
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log.info("Column definitions for {}.{} changed, invalidating related prepared statements", ks_name, cf_name);
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remove_invalid_prepared_statements(ks_name, cf_name);
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}
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}
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void query_processor::migration_subscriber::on_update_user_type(const sstring& ks_name, const sstring& type_name)
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{
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}
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void query_processor::migration_subscriber::on_update_function(const sstring& ks_name, const sstring& function_name)
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{
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}
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void query_processor::migration_subscriber::on_update_aggregate(const sstring& ks_name, const sstring& aggregate_name)
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{
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}
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void query_processor::migration_subscriber::on_drop_keyspace(const sstring& ks_name)
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{
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remove_invalid_prepared_statements(ks_name, std::experimental::nullopt);
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}
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void query_processor::migration_subscriber::on_drop_column_family(const sstring& ks_name, const sstring& cf_name)
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{
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remove_invalid_prepared_statements(ks_name, cf_name);
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}
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void query_processor::migration_subscriber::on_drop_user_type(const sstring& ks_name, const sstring& type_name)
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{
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}
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void query_processor::migration_subscriber::on_drop_function(const sstring& ks_name, const sstring& function_name)
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{
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log.warn("{} event ignored", __func__);
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}
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void query_processor::migration_subscriber::on_drop_aggregate(const sstring& ks_name, const sstring& aggregate_name)
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{
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log.warn("{} event ignored", __func__);
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}
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void query_processor::migration_subscriber::remove_invalid_prepared_statements(sstring ks_name, std::experimental::optional<sstring> cf_name)
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{
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std::vector<bytes> invalid;
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for (auto& kv : _qp->_prepared_statements) {
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auto id = kv.first;
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auto stmt = kv.second;
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if (should_invalidate(ks_name, cf_name, stmt->statement)) {
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invalid.emplace_back(id);
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}
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}
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for (auto& id : invalid) {
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_qp->invalidate_prepared_statement(id);
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}
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}
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bool query_processor::migration_subscriber::should_invalidate(sstring ks_name, std::experimental::optional<sstring> cf_name, ::shared_ptr<cql_statement> statement)
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{
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return statement->depends_on_keyspace(ks_name) && (!cf_name || statement->depends_on_column_family(*cf_name));
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}
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}
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