734cfa949a
Currently we only do that when column set changes. When prepared
statements are executed, paramaters like read repair chance are read
from schema version stored in the statement. Not invalidating prepared
statements on changes of such parameters will appear as if alter took
no effect.
Fixes #1255.
Message-Id: <1462985495-9767-1-git-send-email-tgrabiec@scylladb.com>
(cherry picked from commit 13d8cd0ae9)
497 lines
19 KiB
C++
497 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 (C) 2015 ScyllaDB
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*
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* Modified by 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 "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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_collectd_regs.push_back(
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scollectd::add_polled_metric(scollectd::type_instance_id("query_processor"
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, scollectd::per_cpu_plugin_instance
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, "total_operations", "statements_prepared")
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, scollectd::make_typed(scollectd::data_type::DERIVE, _stats.prepare_invocations)));
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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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return statement->check_access(query_state.get_client_state()).then([this, statement, &query_state, &options]() {
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auto& client_state = query_state.get_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 (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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}
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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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++_stats.prepare_invocations;
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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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cql3_parser::CqlLexer::collector_type lexer_error_collector(query);
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cql3_parser::CqlParser::collector_type 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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return batch->check_access(query_state.get_client_state()).then([this, &query_state, &options, batch] {
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batch->validate();
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batch->validate(_proxy, query_state.get_client_state());
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return batch->execute(_proxy, query_state, options);
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});
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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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// #1255: Ignoring columns_changed deliberately.
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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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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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