419 lines
12 KiB
C++
419 lines
12 KiB
C++
/*
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* Copyright (c) 2018 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2023-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include "server_utils.hh"
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#include <algorithm>
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#include <inttypes.h>
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#include <maxbase/format.hh>
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#include <maxbase/assert.h>
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using std::string;
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using maxbase::string_printf;
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namespace
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{
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// Used for Slave_IO_Running
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const char YES[] = "Yes";
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const char PREPARING[] = "Preparing";
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const char CONNECTING[] = "Connecting";
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const char NO[] = "No";
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}
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string SlaveStatus::to_string() const
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{
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// Print all of this on the same line to make things compact. Are the widths reasonable? The format is
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// not quite array-like since usually there is just one row. May be changed later.
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// Form the components of the line.
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string host_port = string_printf("[%s]:%d", master_host.c_str(), master_port);
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string running_states = string_printf("%s/%s",
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slave_io_to_string(slave_io_running).c_str(),
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slave_sql_running ? "Yes" : "No");
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string rval = string_printf(
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" Host: %22s, IO/SQL running: %7s, Master ID: %4" PRId64 ", Gtid_IO_Pos: %s, R.Lag: %d",
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host_port.c_str(),
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running_states.c_str(),
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master_server_id,
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gtid_io_pos.to_string().c_str(),
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seconds_behind_master);
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return rval;
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}
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string SlaveStatus::to_short_string() const
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{
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if (name.empty())
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{
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return string_printf("Slave connection from %s to [%s]:%i",
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owning_server.c_str(), master_host.c_str(), master_port);
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}
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else
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{
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return string_printf("Slave connection '%s' from %s to [%s]:%i",
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name.c_str(), owning_server.c_str(), master_host.c_str(), master_port);
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}
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}
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json_t* SlaveStatus::to_json() const
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{
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json_t* result = json_object();
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json_object_set_new(result, "connection_name", json_string(name.c_str()));
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json_object_set_new(result, "master_host", json_string(master_host.c_str()));
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json_object_set_new(result, "master_port", json_integer(master_port));
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json_object_set_new(result,
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"slave_io_running",
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json_string(slave_io_to_string(slave_io_running).c_str()));
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json_object_set_new(result, "slave_sql_running", json_string(slave_sql_running ? "Yes" : "No"));
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json_object_set_new(result, "seconds_behing_master",
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seconds_behind_master == SERVER::RLAG_UNDEFINED ? json_null() :
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json_integer(seconds_behind_master));
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json_object_set_new(result, "master_server_id", json_integer(master_server_id));
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json_object_set_new(result, "last_io_or_sql_error", json_string(last_error.c_str()));
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json_object_set_new(result, "gtid_io_pos", json_string(gtid_io_pos.to_string().c_str()));
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return result;
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}
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SlaveStatus::slave_io_running_t SlaveStatus::slave_io_from_string(const std::string& str)
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{
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slave_io_running_t rval = SLAVE_IO_NO;
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if (str == YES)
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{
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rval = SLAVE_IO_YES;
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}
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// Interpret "Preparing" as "Connecting". It's not quite clear if the master server id has been read
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// or if server versions between master and slave have been checked, so better be on the safe side.
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else if (str == CONNECTING || str == PREPARING)
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{
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rval = SLAVE_IO_CONNECTING;
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}
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else if (str != NO)
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{
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MXS_ERROR("Unexpected value for Slave_IO_Running: '%s'.", str.c_str());
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}
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return rval;
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}
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string SlaveStatus::slave_io_to_string(SlaveStatus::slave_io_running_t slave_io)
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{
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string rval;
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switch (slave_io)
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{
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case SlaveStatus::SLAVE_IO_YES:
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rval = YES;
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break;
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case SlaveStatus::SLAVE_IO_CONNECTING:
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rval = CONNECTING;
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break;
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case SlaveStatus::SLAVE_IO_NO:
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rval = NO;
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break;
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default:
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mxb_assert(!false);
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}
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return rval;
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}
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bool SlaveStatus::should_be_copied(string* ignore_reason_out) const
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{
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bool accepted = true;
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auto master_id = master_server_id;
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// The connection is only copied if it is running or at least has been seen running.
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// Also, target should not be this server.
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string ignore_reason;
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if (!slave_sql_running)
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{
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accepted = false;
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ignore_reason = "its slave sql thread is not running.";
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}
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else if (!seen_connected)
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{
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accepted = false;
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ignore_reason = "it has not been seen connected to master.";
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}
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else if (master_id <= 0)
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{
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accepted = false;
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ignore_reason = string_printf("its Master_Server_Id (%" PRIi64 ") is invalid .", master_id);
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}
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if (!accepted)
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{
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*ignore_reason_out = ignore_reason;
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}
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return accepted;
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}
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ServerOperation::ServerOperation(MariaDBServer* target, bool was_is_master,
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const SlaveStatusArray& conns_to_copy,
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const EventNameSet& events_to_enable)
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: target(target)
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, to_from_master(was_is_master)
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, conns_to_copy(conns_to_copy)
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, events_to_enable(events_to_enable)
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{
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}
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ServerOperation::ServerOperation(MariaDBServer* target, bool was_is_master)
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: ServerOperation(target, was_is_master, SlaveStatusArray() /* empty */, EventNameSet() /* empty */)
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{
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}
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GeneralOpData::GeneralOpData(json_t** error, maxbase::Duration time_remaining)
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: error_out(error)
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, time_remaining(time_remaining)
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{
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}
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GtidList GtidList::from_string(const string& gtid_string)
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{
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mxb_assert(gtid_string.size());
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GtidList rval;
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bool error = false;
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bool have_more = false;
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const char* str = gtid_string.c_str();
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do
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{
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char* endptr = NULL;
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auto new_triplet = Gtid::from_string(str, &endptr);
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if (new_triplet.m_server_id == SERVER_ID_UNKNOWN)
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{
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error = true;
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}
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else
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{
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rval.m_triplets.push_back(new_triplet);
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// The last number must be followed by ',' (another triplet) or \0 (last triplet)
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if (*endptr == ',')
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{
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have_more = true;
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str = endptr + 1;
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}
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else if (*endptr == '\0')
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{
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have_more = false;
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}
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else
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{
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error = true;
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}
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}
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}
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while (have_more && !error);
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if (error)
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{
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// If error occurred, clear the gtid as something is very wrong.
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rval.m_triplets.clear();
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}
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else
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{
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// Usually the servers gives the triplets ordered by domain id:s, but this is not 100%.
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std::sort(rval.m_triplets.begin(), rval.m_triplets.end(), Gtid::compare_domains);
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}
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return rval;
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}
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string GtidList::to_string() const
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{
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string rval;
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string separator;
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for (auto iter = m_triplets.begin(); iter != m_triplets.end(); iter++)
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{
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rval += separator + iter->to_string();
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separator = ",";
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}
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return rval;
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}
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bool GtidList::can_replicate_from(const GtidList& master_gtid)
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{
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/* The result of this function is false if the source and master have a common domain id where
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* the source is ahead of the master. */
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return events_ahead(master_gtid, MISSING_DOMAIN_IGNORE) == 0;
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}
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bool GtidList::empty() const
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{
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return m_triplets.empty();
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}
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bool GtidList::operator==(const GtidList& rhs) const
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{
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return m_triplets == rhs.m_triplets;
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}
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uint64_t GtidList::events_ahead(const GtidList& rhs, substraction_mode_t domain_substraction_mode) const
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{
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const size_t n_lhs = m_triplets.size();
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const size_t n_rhs = rhs.m_triplets.size();
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size_t ind_lhs = 0, ind_rhs = 0;
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uint64_t events = 0;
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// GtidLists are assumed to be ordered by domain in ascending order.
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while (ind_lhs < n_lhs && ind_rhs < n_rhs)
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{
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auto lhs_triplet = m_triplets[ind_lhs];
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auto rhs_triplet = rhs.m_triplets[ind_rhs];
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// Server id -1 should never be saved in a real gtid variable.
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mxb_assert(lhs_triplet.m_server_id != SERVER_ID_UNKNOWN
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&& rhs_triplet.m_server_id != SERVER_ID_UNKNOWN);
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// Search for matching domain_id:s, advance the smaller one.
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if (lhs_triplet.m_domain < rhs_triplet.m_domain)
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{
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if (domain_substraction_mode == MISSING_DOMAIN_LHS_ADD)
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{
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// The domain on lhs does not exist on rhs. Add entire sequence number of lhs to the result.
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events += lhs_triplet.m_sequence;
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}
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ind_lhs++;
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}
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else if (lhs_triplet.m_domain > rhs_triplet.m_domain)
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{
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ind_rhs++;
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}
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else
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{
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// Domains match, check sequences.
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if (lhs_triplet.m_sequence > rhs_triplet.m_sequence)
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{
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/* Same domains, but lhs sequence is ahead of rhs sequence. */
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events += lhs_triplet.m_sequence - rhs_triplet.m_sequence;
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}
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// Continue to next domains.
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ind_lhs++;
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ind_rhs++;
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}
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}
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// If LHS has domains with higher id:s than at RHS, those domains need to be iterated here.
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// This only affects the result if the LHS_ADD-mode is used.
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if (domain_substraction_mode == MISSING_DOMAIN_LHS_ADD)
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{
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for (; ind_lhs < n_lhs; ind_lhs++)
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{
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events += m_triplets[ind_lhs].m_sequence;
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}
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}
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return events;
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}
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Gtid Gtid::from_string(const char* str, char** endptr)
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{
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/* Error checking the gtid string is a bit questionable, as having an error means that the server is
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* buggy or network has faults, in which case nothing can be trusted. But without error checking
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* MaxScale may crash if string is wrong. */
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mxb_assert(endptr);
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const char* ptr = str;
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char* strtoull_endptr = NULL;
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// Parse three numbers separated by -
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uint64_t parsed_numbers[3];
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bool error = false;
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for (int i = 0; i < 3 && !error; i++)
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{
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errno = 0;
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parsed_numbers[i] = strtoull(ptr, &strtoull_endptr, 10);
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// Check for parse error. Even this is not quite enough because strtoull will silently convert
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// negative values. Yet, strtoull is required for the third value.
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if (errno != 0 || strtoull_endptr == ptr)
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{
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error = true;
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}
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else if (i < 2)
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{
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// First two numbers must be followed by a -
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if (*strtoull_endptr == '-')
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{
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ptr = strtoull_endptr + 1;
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}
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else
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{
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error = true;
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}
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}
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}
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// Check that none of the parsed numbers are unexpectedly large. This shouldn't really be possible unless
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// server has a bug or network had an error.
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if (!error && (parsed_numbers[0] > UINT32_MAX || parsed_numbers[1] > UINT32_MAX))
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{
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error = true;
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}
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if (!error)
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{
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*endptr = strtoull_endptr;
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return Gtid((uint32_t)parsed_numbers[0], parsed_numbers[1], parsed_numbers[2]);
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}
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else
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{
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return Gtid();
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}
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}
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Gtid::Gtid()
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: m_domain(0)
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, m_server_id(SERVER_ID_UNKNOWN)
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, m_sequence(0)
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{
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}
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Gtid::Gtid(uint32_t domain, int64_t server_id, uint64_t sequence)
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: m_domain(domain)
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, m_server_id(server_id)
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, m_sequence(sequence)
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{
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}
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bool Gtid::eq(const Gtid& rhs) const
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{
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return m_domain == rhs.m_domain && m_server_id == rhs.m_server_id && m_sequence == rhs.m_sequence;
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}
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string Gtid::to_string() const
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{
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string rval;
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if (m_server_id != SERVER_ID_UNKNOWN)
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{
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rval += string_printf("%" PRIu32 "-%" PRIi64 "-%" PRIu64, m_domain, m_server_id, m_sequence);
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}
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return rval;
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}
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Gtid GtidList::get_gtid(uint32_t domain) const
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{
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Gtid rval;
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// Make a dummy triplet for the domain search
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Gtid search_val(domain, -1, 0);
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auto found = std::lower_bound(m_triplets.begin(),
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m_triplets.end(),
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search_val,
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Gtid::compare_domains);
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if (found != m_triplets.end() && found->m_domain == domain)
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{
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rval = *found;
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}
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return rval;
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}
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GtidList::DomainList GtidList::domains() const
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{
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DomainList rval;
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for (auto& gtid : m_triplets)
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{
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rval.push_back(gtid.m_domain);
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}
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return rval;
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}
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