7fdc8563bf
I used the following as a reference: https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/virtual/ClientsTable.java At this moment there is only info about IP, clients outgoing port, client 'type' (i.e. CQL/thrift/alternator), shard ID and username. Column `request_count' is NOT present and CK consists of (`port', `client_type'), contrary to what C*'s has: (`port'). Code that notifies `system.clients` about new connections goes to top-level files `connection_notifier.*`. Currently only CQL clients are observed, but enum `client_type` can be used in future to notify about connections with other protocols.
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*
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* Copyright (C) 2019 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 "connection_notifier.hh"
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#include "db/query_context.hh"
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#include "cql3/constants.hh"
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#include "database.hh"
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#include "service/storage_proxy.hh"
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#include <stdexcept>
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namespace db::system_keyspace {
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extern const char *const CLIENTS;
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}
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static sstring to_string(client_type ct) {
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switch (ct) {
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case client_type::cql: return "cql";
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case client_type::thrift: return "thrift";
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case client_type::alternator: return "alternator";
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default: throw std::runtime_error("Invalid client_type");
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}
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}
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future<> notify_new_client(client_data cd) {
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// FIXME: consider prepared statement
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const static sstring req
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= format("INSERT INTO system.{} (address, port, client_type, shard_id, protocol_version, username) "
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"VALUES (?, ?, ?, ?, ?, ?);", db::system_keyspace::CLIENTS);
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return db::execute_cql(req,
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std::move(cd.ip), cd.port, to_string(cd.ct), cd.shard_id,
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cd.protocol_version.has_value() ? data_value(*cd.protocol_version) : data_value::make_null(int32_type),
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cd.username.value_or("anonymous")).discard_result();
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}
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future<> notify_disconnected_client(gms::inet_address addr, client_type ct, int port) {
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// FIXME: consider prepared statement
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const static sstring req
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= format("DELETE FROM system.{} where address=? AND port=? AND client_type=?;",
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db::system_keyspace::CLIENTS);
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return db::execute_cql(req, addr.addr(), port, to_string(ct)).discard_result();
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}
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future<> clear_clientlist() {
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auto& db_local = service::get_storage_proxy().local().get_db().local();
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return db_local.truncate(
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db_local.find_keyspace(db::system_keyspace_name()),
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db_local.find_column_family(db::system_keyspace_name(),
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db::system_keyspace::CLIENTS),
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[] { return make_ready_future<db_clock::time_point>(db_clock::now()); },
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false /* with_snapshot */);
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}
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