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https://github.com/ClickHouse/ClickHouse.git
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307 lines
11 KiB
C++
307 lines
11 KiB
C++
#include <Interpreters/InterpreterKillQueryQuery.h>
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#include <Parsers/ASTKillQueryQuery.h>
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#include <Parsers/queryToString.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/DDLWorker.h>
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#include <Interpreters/ProcessList.h>
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#include <Interpreters/executeQuery.h>
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#include <Interpreters/CancellationCode.h>
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#include <Access/AccessRightsContext.h>
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#include <Columns/ColumnString.h>
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#include <Common/typeid_cast.h>
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#include <DataTypes/DataTypeString.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <Storages/IStorage.h>
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#include <Common/quoteString.h>
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#include <thread>
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#include <iostream>
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#include <cstddef>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int READONLY;
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extern const int LOGICAL_ERROR;
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extern const int CANNOT_KILL;
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extern const int ACCESS_DENIED;
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}
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static const char * cancellationCodeToStatus(CancellationCode code)
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{
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switch (code)
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{
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case CancellationCode::NotFound:
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return "finished";
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case CancellationCode::QueryIsNotInitializedYet:
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return "pending";
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case CancellationCode::CancelCannotBeSent:
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return "cant_cancel";
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case CancellationCode::CancelSent:
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return "waiting";
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default:
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return "unknown_status";
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}
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}
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struct QueryDescriptor
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{
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String query_id;
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String user;
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size_t source_num;
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bool processed = false;
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QueryDescriptor(String && query_id_, String && user_, size_t source_num_, bool processed_ = false)
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: query_id(std::move(query_id_)), user(std::move(user_)), source_num(source_num_), processed(processed_) {}
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};
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using QueryDescriptors = std::vector<QueryDescriptor>;
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static void insertResultRow(size_t n, CancellationCode code, const Block & source, const Block & header, MutableColumns & columns)
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{
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columns[0]->insert(cancellationCodeToStatus(code));
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for (size_t col_num = 1, size = columns.size(); col_num < size; ++col_num)
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columns[col_num]->insertFrom(*source.getByName(header.getByPosition(col_num).name).column, n);
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}
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static QueryDescriptors extractQueriesExceptMeAndCheckAccess(const Block & processes_block, Context & context)
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{
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QueryDescriptors res;
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size_t num_processes = processes_block.rows();
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res.reserve(num_processes);
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const ColumnString & query_id_col = typeid_cast<const ColumnString &>(*processes_block.getByName("query_id").column);
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const ColumnString & user_col = typeid_cast<const ColumnString &>(*processes_block.getByName("user").column);
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const ClientInfo & my_client = context.getProcessListElement()->getClientInfo();
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std::optional<bool> can_kill_query_started_by_another_user;
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String query_user;
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for (size_t i = 0; i < num_processes; ++i)
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{
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if ((my_client.current_query_id == query_id_col.getDataAt(i).toString())
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&& (my_client.current_user == user_col.getDataAt(i).toString()))
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continue;
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auto query_id = query_id_col.getDataAt(i).toString();
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query_user = user_col.getDataAt(i).toString();
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if (my_client.current_user != query_user)
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{
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if (!can_kill_query_started_by_another_user)
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can_kill_query_started_by_another_user = context.getAccessRights()->isGranted(&Poco::Logger::get("InterpreterKillQueryQuery"), AccessType::KILL_QUERY);
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if (!can_kill_query_started_by_another_user.value())
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continue;
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}
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res.emplace_back(std::move(query_id), std::move(query_user), i, false);
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}
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if (res.empty() && !query_user.empty())
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throw Exception("User " + my_client.current_user + " attempts to kill query created by " + query_user, ErrorCodes::ACCESS_DENIED);
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return res;
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}
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class SyncKillQueryInputStream : public IBlockInputStream
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{
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public:
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SyncKillQueryInputStream(ProcessList & process_list_, QueryDescriptors && processes_to_stop_, Block && processes_block_,
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const Block & res_sample_block_)
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: process_list(process_list_),
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processes_to_stop(std::move(processes_to_stop_)),
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processes_block(std::move(processes_block_)),
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res_sample_block(res_sample_block_)
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{
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addTotalRowsApprox(processes_to_stop.size());
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}
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String getName() const override
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{
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return "SynchronousQueryKiller";
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}
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Block getHeader() const override { return res_sample_block; }
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Block readImpl() override
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{
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size_t num_result_queries = processes_to_stop.size();
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if (num_processed_queries >= num_result_queries)
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return Block();
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MutableColumns columns = res_sample_block.cloneEmptyColumns();
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do
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{
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for (auto & curr_process : processes_to_stop)
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{
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if (curr_process.processed)
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continue;
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auto code = process_list.sendCancelToQuery(curr_process.query_id, curr_process.user, true);
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if (code != CancellationCode::QueryIsNotInitializedYet && code != CancellationCode::CancelSent)
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{
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curr_process.processed = true;
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insertResultRow(curr_process.source_num, code, processes_block, res_sample_block, columns);
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++num_processed_queries;
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}
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/// Wait if CancelSent
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}
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/// KILL QUERY could be killed also
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if (isCancelled())
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break;
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/// Sleep if there are unprocessed queries
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if (num_processed_queries < num_result_queries)
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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/// Don't produce empty block
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} while (columns.empty() || columns[0]->empty());
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return res_sample_block.cloneWithColumns(std::move(columns));
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}
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ProcessList & process_list;
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QueryDescriptors processes_to_stop;
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Block processes_block;
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Block res_sample_block;
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size_t num_processed_queries = 0;
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};
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BlockIO InterpreterKillQueryQuery::execute()
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{
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const auto & query = query_ptr->as<ASTKillQueryQuery &>();
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if (!query.cluster.empty())
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return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccessForDDLOnCluster());
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BlockIO res_io;
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switch (query.type)
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{
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case ASTKillQueryQuery::Type::Query:
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{
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Block processes_block = getSelectResult("query_id, user, query", "system.processes");
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if (!processes_block)
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return res_io;
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ProcessList & process_list = context.getProcessList();
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QueryDescriptors queries_to_stop = extractQueriesExceptMeAndCheckAccess(processes_block, context);
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auto header = processes_block.cloneEmpty();
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header.insert(0, {ColumnString::create(), std::make_shared<DataTypeString>(), "kill_status"});
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if (!query.sync || query.test)
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{
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MutableColumns res_columns = header.cloneEmptyColumns();
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for (const auto & query_desc : queries_to_stop)
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{
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auto code = (query.test) ? CancellationCode::Unknown : process_list.sendCancelToQuery(query_desc.query_id, query_desc.user, true);
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insertResultRow(query_desc.source_num, code, processes_block, header, res_columns);
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}
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res_io.in = std::make_shared<OneBlockInputStream>(header.cloneWithColumns(std::move(res_columns)));
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}
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else
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{
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res_io.in = std::make_shared<SyncKillQueryInputStream>(
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process_list, std::move(queries_to_stop), std::move(processes_block), header);
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}
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break;
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}
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case ASTKillQueryQuery::Type::Mutation:
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{
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Block mutations_block = getSelectResult("database, table, mutation_id", "system.mutations");
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if (!mutations_block)
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return res_io;
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const ColumnString & database_col = typeid_cast<const ColumnString &>(*mutations_block.getByName("database").column);
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const ColumnString & table_col = typeid_cast<const ColumnString &>(*mutations_block.getByName("table").column);
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const ColumnString & mutation_id_col = typeid_cast<const ColumnString &>(*mutations_block.getByName("mutation_id").column);
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auto header = mutations_block.cloneEmpty();
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header.insert(0, {ColumnString::create(), std::make_shared<DataTypeString>(), "kill_status"});
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MutableColumns res_columns = header.cloneEmptyColumns();
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String database_name, table_name;
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for (size_t i = 0; i < mutations_block.rows(); ++i)
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{
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database_name = database_col.getDataAt(i).toString();
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table_name = table_col.getDataAt(i).toString();
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auto mutation_id = mutation_id_col.getDataAt(i).toString();
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CancellationCode code = CancellationCode::Unknown;
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if (!query.test)
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{
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auto storage = context.tryGetTable(database_name, table_name);
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if (!storage)
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code = CancellationCode::NotFound;
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else
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{
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if (!context.getAccessRights()->isGranted(&Poco::Logger::get("InterpreterKillQueryQuery"), AccessType::KILL_MUTATION, database_name, table_name))
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continue;
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code = storage->killMutation(mutation_id);
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}
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}
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insertResultRow(i, code, mutations_block, header, res_columns);
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}
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if (res_columns[0]->empty() && !table_name.empty())
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throw Exception(
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"Not allowed to kill mutation on " + backQuoteIfNeed(database_name) + "." + backQuoteIfNeed(table_name),
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ErrorCodes::ACCESS_DENIED);
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res_io.in = std::make_shared<OneBlockInputStream>(header.cloneWithColumns(std::move(res_columns)));
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break;
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}
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}
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return res_io;
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}
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Block InterpreterKillQueryQuery::getSelectResult(const String & columns, const String & table)
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{
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String select_query = "SELECT " + columns + " FROM " + table;
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auto & where_expression = query_ptr->as<ASTKillQueryQuery>()->where_expression;
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if (where_expression)
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select_query += " WHERE " + queryToString(where_expression);
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BlockIO block_io = executeQuery(select_query, context.getGlobalContext(), true, QueryProcessingStage::Complete, false, false);
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Block res = block_io.in->read();
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if (res && block_io.in->read())
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throw Exception("Expected one block from input stream", ErrorCodes::LOGICAL_ERROR);
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return res;
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}
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AccessRightsElements InterpreterKillQueryQuery::getRequiredAccessForDDLOnCluster() const
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{
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const auto & query = query_ptr->as<ASTKillQueryQuery &>();
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AccessRightsElements required_access;
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if (query.type == ASTKillQueryQuery::Type::Query)
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required_access.emplace_back(AccessType::KILL_QUERY);
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else if (query.type == ASTKillQueryQuery::Type::Mutation)
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required_access.emplace_back(AccessType::KILL_MUTATION);
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return required_access;
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}
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}
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