mirror of
https://github.com/scylladb/scylladb.git
synced 2026-06-03 13:37:04 +00:00
36ec43a262
This change introduces system.clients table, which provides information about CQL clients connected. PK is the client's IP address, CK consists of outgoing port number and client_type (which will be extended in future to thrift/alternator/redis). Table supplies also shard_id and username. Other columns, like connection_stage, driver_name, driver_version..., are currently empty but exist for C* compatibility and future use. This is an ordinary table (i.e. non-virtual) and it's updated upon accepting connections. This is also why C*'s column request_count was not introduced. In case of abrupt DB stop, the table should not persist, so it's being truncated on startup. Resolves #4820
300 lines
15 KiB
C++
300 lines
15 KiB
C++
/*
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* Copyright (C) 2015 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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#pragma once
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#include "auth/service.hh"
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#include <seastar/core/reactor.hh>
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#include "service/endpoint_lifecycle_subscriber.hh"
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#include "service/migration_listener.hh"
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#include "service/storage_proxy.hh"
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#include "cql3/query_processor.hh"
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#include "cql3/values.hh"
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#include "auth/authenticator.hh"
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#include <seastar/core/distributed.hh>
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#include "timeout_config.hh"
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#include <seastar/core/semaphore.hh>
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#include <memory>
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#include <boost/intrusive/list.hpp>
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#include <seastar/net/tls.hh>
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#include <seastar/core/metrics_registration.hh>
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#include "utils/fragmented_temporary_buffer.hh"
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#include "service_permit.hh"
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#include <seastar/core/sharded.hh>
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namespace scollectd {
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class registrations;
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}
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class database;
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struct client_data;
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namespace cql_transport {
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class request_reader;
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class response;
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enum class cql_compression {
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none,
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lz4,
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snappy,
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};
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enum cql_frame_flags {
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compression = 0x01,
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tracing = 0x02,
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warning = 0x08,
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};
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struct [[gnu::packed]] cql_binary_frame_v1 {
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uint8_t version;
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uint8_t flags;
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uint8_t stream;
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uint8_t opcode;
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net::packed<uint32_t> length;
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template <typename Adjuster>
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void adjust_endianness(Adjuster a) {
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return a(length);
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}
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};
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struct [[gnu::packed]] cql_binary_frame_v3 {
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uint8_t version;
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uint8_t flags;
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net::packed<uint16_t> stream;
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uint8_t opcode;
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net::packed<uint32_t> length;
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template <typename Adjuster>
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void adjust_endianness(Adjuster a) {
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return a(stream, length);
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}
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};
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struct cql_query_state {
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service::query_state query_state;
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std::unique_ptr<cql3::query_options> options;
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cql_query_state(service::client_state& client_state, service_permit permit)
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: query_state(client_state, std::move(permit))
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{ }
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cql_query_state(service::client_state& client_state, tracing::trace_state_ptr trace_state_ptr, service_permit permit)
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: query_state(client_state, std::move(trace_state_ptr), std::move(permit))
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{ }
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};
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struct cql_server_config {
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::timeout_config timeout_config;
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size_t max_request_size;
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std::function<semaphore& ()> get_service_memory_limiter_semaphore;
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bool allow_shard_aware_drivers = true;
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smp_service_group bounce_request_smp_service_group = default_smp_service_group();
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};
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class cql_server : public seastar::peering_sharded_service<cql_server> {
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private:
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class event_notifier;
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static constexpr cql_protocol_version_type current_version = cql_serialization_format::latest_version;
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std::vector<server_socket> _listeners;
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distributed<cql3::query_processor>& _query_processor;
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cql_server_config _config;
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size_t _max_request_size;
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semaphore& _memory_available;
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seastar::metrics::metric_groups _metrics;
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std::unique_ptr<event_notifier> _notifier;
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private:
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uint64_t _connects = 0;
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uint64_t _connections = 0;
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uint64_t _requests_served = 0;
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uint64_t _requests_serving = 0;
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uint64_t _requests_blocked_memory = 0;
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auth::service& _auth_service;
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const cql3::cql_config& _cql_config;
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public:
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cql_server(distributed<cql3::query_processor>& qp, auth::service&,
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const cql3::cql_config& cql_config, cql_server_config config);
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future<> listen(socket_address addr, std::shared_ptr<seastar::tls::credentials_builder> = {}, bool keepalive = false);
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future<> do_accepts(int which, bool keepalive, socket_address server_addr);
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future<> stop();
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public:
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using response = cql_transport::response;
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private:
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class fmt_visitor;
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friend class connection;
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friend std::unique_ptr<cql_server::response> make_result(int16_t stream, messages::result_message& msg,
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const tracing::trace_state_ptr& tr_state, cql_protocol_version_type version, bool skip_metadata);
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class connection : public boost::intrusive::list_base_hook<> {
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cql_server& _server;
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socket_address _server_addr;
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connected_socket _fd;
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input_stream<char> _read_buf;
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output_stream<char> _write_buf;
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fragmented_temporary_buffer::reader _buffer_reader;
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seastar::gate _pending_requests_gate;
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future<> _ready_to_respond = make_ready_future<>();
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cql_protocol_version_type _version = 0;
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cql_compression _compression = cql_compression::none;
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cql_serialization_format _cql_serialization_format = cql_serialization_format::latest();
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service::client_state _client_state;
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std::unordered_map<uint16_t, cql_query_state> _query_states;
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unsigned _request_cpu = 0;
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enum class tracing_request_type : uint8_t {
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not_requested,
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no_write_on_close,
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write_on_close
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};
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private:
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using execution_stage_type = inheriting_concrete_execution_stage<
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future<foreign_ptr<std::unique_ptr<cql_server::response>>>,
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cql_server::connection*,
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fragmented_temporary_buffer::istream,
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uint8_t,
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uint16_t,
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service::client_state&,
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tracing_request_type,
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service_permit>;
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static thread_local execution_stage_type _process_request_stage;
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public:
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connection(cql_server& server, socket_address server_addr, connected_socket&& fd, socket_address addr);
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~connection();
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future<> process();
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future<> process_request();
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future<> shutdown();
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client_data make_client_data() const;
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const service::client_state& get_client_state() const { return _client_state; }
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private:
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const ::timeout_config& timeout_config() const { return _server.timeout_config(); }
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friend class process_request_executor;
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future<foreign_ptr<std::unique_ptr<cql_server::response>>> process_request_one(fragmented_temporary_buffer::istream buf, uint8_t op, uint16_t stream, service::client_state& client_state, tracing_request_type tracing_request, service_permit permit);
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unsigned frame_size() const;
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unsigned pick_request_cpu();
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cql_binary_frame_v3 parse_frame(temporary_buffer<char> buf) const;
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future<fragmented_temporary_buffer> read_and_decompress_frame(size_t length, uint8_t flags);
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future<std::optional<cql_binary_frame_v3>> read_frame();
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future<std::unique_ptr<cql_server::response>> process_startup(uint16_t stream, request_reader in, service::client_state& client_state);
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future<std::unique_ptr<cql_server::response>> process_auth_response(uint16_t stream, request_reader in, service::client_state& client_state);
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future<std::unique_ptr<cql_server::response>> process_options(uint16_t stream, request_reader in, service::client_state& client_state);
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future<foreign_ptr<std::unique_ptr<cql_server::response>>> process_query(uint16_t stream, request_reader in, service::client_state& client_state, service_permit permit);
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future<std::unique_ptr<cql_server::response>> process_prepare(uint16_t stream, request_reader in, service::client_state& client_state);
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future<foreign_ptr<std::unique_ptr<cql_server::response>>> process_execute(uint16_t stream, request_reader in, service::client_state& client_state, service_permit permit);
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future<std::unique_ptr<cql_server::response>> process_batch(uint16_t stream, request_reader in, service::client_state& client_state, service_permit permit);
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future<std::unique_ptr<cql_server::response>> process_register(uint16_t stream, request_reader in, service::client_state& client_state);
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std::unique_ptr<cql_server::response> make_unavailable_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t required, int32_t alive, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_read_timeout_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t blockfor, bool data_present, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_read_failure_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t numfailures, int32_t blockfor, bool data_present, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_mutation_write_timeout_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t blockfor, db::write_type type, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_mutation_write_failure_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t numfailures, int32_t blockfor, db::write_type type, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_already_exists_error(int16_t stream, exceptions::exception_code err, sstring msg, sstring ks_name, sstring cf_name, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_unprepared_error(int16_t stream, exceptions::exception_code err, sstring msg, bytes id, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_error(int16_t stream, exceptions::exception_code err, sstring msg, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_ready(int16_t stream, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_supported(int16_t stream, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_topology_change_event(const cql_transport::event::topology_change& event) const;
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std::unique_ptr<cql_server::response> make_status_change_event(const cql_transport::event::status_change& event) const;
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std::unique_ptr<cql_server::response> make_schema_change_event(const cql_transport::event::schema_change& event) const;
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std::unique_ptr<cql_server::response> make_autheticate(int16_t, const sstring&, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_auth_success(int16_t, bytes, const tracing::trace_state_ptr& tr_state) const;
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std::unique_ptr<cql_server::response> make_auth_challenge(int16_t, bytes, const tracing::trace_state_ptr& tr_state) const;
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future<foreign_ptr<std::unique_ptr<cql_server::response>>>
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process_execute_on_shard(unsigned shard, uint16_t stream, fragmented_temporary_buffer::istream is,
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service::client_state& cs, service_permit permit);
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future<foreign_ptr<std::unique_ptr<cql_server::response>>>
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process_query_on_shard(unsigned shard, uint16_t stream, fragmented_temporary_buffer::istream is,
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service::client_state& cs, service_permit permit);
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void write_response(foreign_ptr<std::unique_ptr<cql_server::response>>&& response, service_permit permit = empty_service_permit(), cql_compression compression = cql_compression::none);
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void init_cql_serialization_format();
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friend event_notifier;
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};
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friend class type_codec;
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private:
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bool _stopping = false;
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promise<> _all_connections_stopped;
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future<> _stopped = _all_connections_stopped.get_future();
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boost::intrusive::list<connection> _connections_list;
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uint64_t _total_connections = 0;
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uint64_t _current_connections = 0;
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uint64_t _connections_being_accepted = 0;
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private:
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future<> advertise_new_connection(shared_ptr<connection> conn);
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future<> unadvertise_connection(shared_ptr<connection> conn);
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void maybe_idle() {
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if (_stopping && !_connections_being_accepted && !_current_connections) {
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_all_connections_stopped.set_value();
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}
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}
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const ::timeout_config& timeout_config() { return _config.timeout_config; }
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};
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class cql_server::event_notifier : public service::migration_listener,
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public service::endpoint_lifecycle_subscriber
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{
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std::set<cql_server::connection*> _topology_change_listeners;
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std::set<cql_server::connection*> _status_change_listeners;
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std::set<cql_server::connection*> _schema_change_listeners;
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std::unordered_map<gms::inet_address, event::status_change::status_type> _last_status_change;
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public:
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event_notifier();
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~event_notifier();
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void register_event(cql_transport::event::event_type et, cql_server::connection* conn);
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void unregister_connection(cql_server::connection* conn);
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virtual void on_create_keyspace(const sstring& ks_name) override;
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virtual void on_create_column_family(const sstring& ks_name, const sstring& cf_name) override;
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virtual void on_create_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_create_view(const sstring& ks_name, const sstring& view_name) override;
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virtual void on_create_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_create_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_update_keyspace(const sstring& ks_name) override;
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virtual void on_update_column_family(const sstring& ks_name, const sstring& cf_name, bool columns_changed) override;
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virtual void on_update_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_update_view(const sstring& ks_name, const sstring& view_name, bool columns_changed) override;
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virtual void on_update_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_update_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_drop_keyspace(const sstring& ks_name) override;
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virtual void on_drop_column_family(const sstring& ks_name, const sstring& cf_name) override;
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virtual void on_drop_user_type(const sstring& ks_name, const sstring& type_name) override;
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virtual void on_drop_view(const sstring& ks_name, const sstring& view_name) override;
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virtual void on_drop_function(const sstring& ks_name, const sstring& function_name) override;
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virtual void on_drop_aggregate(const sstring& ks_name, const sstring& aggregate_name) override;
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virtual void on_join_cluster(const gms::inet_address& endpoint) override;
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virtual void on_leave_cluster(const gms::inet_address& endpoint) override;
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virtual void on_up(const gms::inet_address& endpoint) override;
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virtual void on_down(const gms::inet_address& endpoint) override;
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};
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}
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