2346 lines
66 KiB
C++
2346 lines
66 KiB
C++
/*
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* Copyright (c) 2016 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: 2022-01-01
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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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/**
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* @file monitor.c - The monitor module management routines
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*/
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#include <maxscale/monitor.hh>
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#include <atomic>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <chrono>
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#include <string>
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#include <sstream>
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#include <set>
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#include <zlib.h>
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#include <sys/stat.h>
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#include <vector>
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#include <mutex>
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#include <maxscale/alloc.h>
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#include <maxscale/clock.h>
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#include <maxscale/json_api.hh>
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#include <maxscale/mariadb.hh>
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#include <maxscale/mysql_utils.hh>
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#include <maxscale/paths.h>
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#include <maxscale/pcre2.h>
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#include <maxscale/routingworker.hh>
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#include <maxscale/secrets.h>
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#include <maxscale/utils.hh>
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#include <maxscale/json_api.hh>
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#include <mysqld_error.h>
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#include "internal/config.hh"
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#include "internal/externcmd.hh"
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#include "internal/monitor.hh"
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#include "internal/modules.hh"
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#include "internal/server.hh"
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#include "internal/service.hh"
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/** Schema version, journals must have a matching version */
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#define MMB_SCHEMA_VERSION 2
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/** Constants for byte lengths of the values */
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#define MMB_LEN_BYTES 4
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#define MMB_LEN_SCHEMA_VERSION 1
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#define MMB_LEN_CRC32 4
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#define MMB_LEN_VALUE_TYPE 1
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#define MMB_LEN_SERVER_STATUS 8
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/** Type of the stored value */
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enum stored_value_type
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{
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SVT_SERVER = 1, // Generic server state information
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SVT_MASTER = 2, // The master server name
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};
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using std::string;
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using std::set;
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using Guard = std::lock_guard<std::mutex>;
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using maxscale::Monitor;
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using maxscale::MonitorServer;
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using ConnectResult = maxscale::MonitorServer::ConnectResult;
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const char CN_BACKEND_CONNECT_ATTEMPTS[] = "backend_connect_attempts";
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const char CN_BACKEND_CONNECT_TIMEOUT[] = "backend_connect_timeout";
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const char CN_BACKEND_READ_TIMEOUT[] = "backend_read_timeout";
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const char CN_BACKEND_WRITE_TIMEOUT[] = "backend_write_timeout";
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const char CN_DISK_SPACE_CHECK_INTERVAL[] = "disk_space_check_interval";
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const char CN_EVENTS[] = "events";
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const char CN_JOURNAL_MAX_AGE[] = "journal_max_age";
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const char CN_MONITOR_INTERVAL[] = "monitor_interval";
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const char CN_SCRIPT[] = "script";
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const char CN_SCRIPT_TIMEOUT[] = "script_timeout";
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namespace
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{
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class ThisUnit
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{
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public:
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/**
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* Mark a monitor as the monitor of the server. A server may only be monitored by one monitor.
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*
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* @param server Server to claim. The name is not checked to be a valid server name.
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* @param new_owner Monitor which claims the server
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* @param existing_owner If server is already monitored, the owning monitor name is written here
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* @return True if success, false if server was claimed by another monitor
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*/
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bool claim_server(const string& server, const string& new_owner, string* existing_owner)
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{
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mxb_assert(Monitor::is_admin_thread());
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bool claim_success = false;
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auto iter = m_server_owners.find(server);
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if (iter != m_server_owners.end())
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{
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// Server is already claimed by a monitor.
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*existing_owner = iter->second;
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}
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else
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{
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m_server_owners[server] = new_owner;
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claim_success = true;
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}
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return claim_success;
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}
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/**
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* Mark a server as unmonitored.
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*
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* @param server The server name
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*/
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void release_server(const string& server)
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{
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mxb_assert(Monitor::is_admin_thread());
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auto iter = m_server_owners.find(server);
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mxb_assert(iter != m_server_owners.end());
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m_server_owners.erase(iter);
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}
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string claimed_by(const string& server)
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{
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mxb_assert(Monitor::is_admin_thread());
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string rval;
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auto iter = m_server_owners.find(server);
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if (iter != m_server_owners.end())
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{
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rval = iter->second;
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}
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return rval;
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}
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private:
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// Global map of servername->monitorname. Not mutexed, as this should only be accessed
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// from the admin thread.
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std::map<string, string> m_server_owners;
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};
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ThisUnit this_unit;
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/** Server type specific bits */
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const uint64_t server_type_bits = SERVER_MASTER | SERVER_SLAVE | SERVER_JOINED;
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/** All server bits */
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const uint64_t all_server_bits = SERVER_RUNNING | SERVER_MAINT | SERVER_MASTER | SERVER_SLAVE
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| SERVER_JOINED;
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const char journal_name[] = "monitor.dat";
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const char journal_template[] = "%s/%s/%s";
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/**
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* @brief Remove .tmp suffix and rename file
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*
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* @param src File to rename
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* @return True if file was successfully renamed
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*/
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bool rename_tmp_file(Monitor* monitor, const char* src)
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{
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bool rval = true;
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char dest[PATH_MAX + 1];
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snprintf(dest, sizeof(dest), journal_template, get_datadir(), monitor->name(), journal_name);
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if (rename(src, dest) == -1)
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{
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rval = false;
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MXS_ERROR("Failed to rename journal file '%s' to '%s': %d, %s",
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src,
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dest,
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errno,
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mxs_strerror(errno));
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}
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return rval;
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}
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/**
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* @brief Open temporary file
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*
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* @param monitor Monitor
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* @param path Output where the path is stored
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* @return Opened file or NULL on error
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*/
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FILE* open_tmp_file(Monitor* monitor, char* path)
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{
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int nbytes = snprintf(path, PATH_MAX, journal_template, get_datadir(), monitor->name(), "");
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int max_bytes = PATH_MAX - (int)sizeof(journal_name);
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FILE* rval = NULL;
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if (nbytes < max_bytes && mxs_mkdir_all(path, 0744))
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{
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strcat(path, journal_name);
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strcat(path, "XXXXXX");
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int fd = mkstemp(path);
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if (fd == -1)
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{
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MXS_ERROR("Failed to open file '%s': %d, %s", path, errno, mxs_strerror(errno));
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}
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else
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{
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rval = fdopen(fd, "w");
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}
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}
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else
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{
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MXS_ERROR("Path is too long: %d characters exceeds the maximum path "
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"length of %d bytes",
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nbytes,
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max_bytes);
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}
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return rval;
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}
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/**
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* @brief Store server data to in-memory buffer
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*
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* @param monitor Monitor
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* @param data Pointer to in-memory buffer used for storage, should be at least
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* PATH_MAX bytes long
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* @param size Size of @c data
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*/
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void store_data(Monitor* monitor, MonitorServer* master, uint8_t* data, uint32_t size)
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{
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uint8_t* ptr = data;
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/** Store the data length */
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mxb_assert(sizeof(size) == MMB_LEN_BYTES);
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ptr = mxs_set_byte4(ptr, size);
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/** Then the schema version */
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*ptr++ = MMB_SCHEMA_VERSION;
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/** Store the states of all servers */
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for (MonitorServer* db : monitor->servers())
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{
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*ptr++ = (char)SVT_SERVER; // Value type
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memcpy(ptr, db->server->name(), strlen(db->server->name()));// Name of the server
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ptr += strlen(db->server->name());
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*ptr++ = '\0'; // Null-terminate the string
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auto status = db->server->status;
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static_assert(sizeof(status) == MMB_LEN_SERVER_STATUS,
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"Status size should be MMB_LEN_SERVER_STATUS bytes");
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ptr = maxscale::set_byteN(ptr, status, MMB_LEN_SERVER_STATUS);
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}
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/** Store the current root master if we have one */
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if (master)
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{
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*ptr++ = (char)SVT_MASTER;
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memcpy(ptr, master->server->name(), strlen(master->server->name()));
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ptr += strlen(master->server->name());
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*ptr++ = '\0'; // Null-terminate the string
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}
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/** Calculate the CRC32 for the complete payload minus the CRC32 bytes */
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uint32_t crc = crc32(0L, NULL, 0);
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crc = crc32(crc, (uint8_t*)data + MMB_LEN_BYTES, size - MMB_LEN_CRC32);
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mxb_assert(sizeof(crc) == MMB_LEN_CRC32);
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ptr = mxs_set_byte4(ptr, crc);
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mxb_assert(ptr - data == size + MMB_LEN_BYTES);
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}
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/**
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* Check that memory area contains a null terminator
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*/
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static bool has_null_terminator(const char* data, const char* end)
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{
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while (data < end)
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{
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if (*data == '\0')
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{
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return true;
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}
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data++;
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}
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return false;
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}
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/**
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* Process a generic server
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*/
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const char* process_server(Monitor* monitor, const char* data, const char* end)
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{
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for (MonitorServer* db : monitor->servers())
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{
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if (strcmp(db->server->name(), data) == 0)
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{
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const unsigned char* sptr = (unsigned char*)strchr(data, '\0');
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mxb_assert(sptr);
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sptr++;
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uint64_t status = maxscale::get_byteN(sptr, MMB_LEN_SERVER_STATUS);
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db->mon_prev_status = status;
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db->server->set_status(status);
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db->set_pending_status(status);
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break;
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}
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}
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data += strlen(data) + 1 + MMB_LEN_SERVER_STATUS;
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return data;
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}
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/**
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* Process a master
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*/
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const char* process_master(Monitor* monitor, MonitorServer** master,
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const char* data, const char* end)
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{
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if (master)
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{
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for (MonitorServer* db : monitor->servers())
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{
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if (strcmp(db->server->name(), data) == 0)
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{
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*master = db;
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break;
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}
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}
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}
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data += strlen(data) + 1;
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return data;
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}
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/**
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* Check that the calculated CRC32 matches the one stored on disk
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*/
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bool check_crc32(const uint8_t* data, uint32_t size, const uint8_t* crc_ptr)
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{
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uint32_t crc = mxs_get_byte4(crc_ptr);
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uint32_t calculated_crc = crc32(0L, NULL, 0);
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calculated_crc = crc32(calculated_crc, data, size);
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return calculated_crc == crc;
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}
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/**
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* Process the stored journal data
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*/
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bool process_data_file(Monitor* monitor, MonitorServer** master,
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const char* data, const char* crc_ptr)
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{
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const char* ptr = data;
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MXB_AT_DEBUG(const char* prevptr = ptr);
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while (ptr < crc_ptr)
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{
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/** All values contain a null terminated string */
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if (!has_null_terminator(ptr, crc_ptr))
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{
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MXS_ERROR("Possible corrupted journal file (no null terminator found). Ignoring.");
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return false;
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}
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stored_value_type type = (stored_value_type)ptr[0];
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ptr += MMB_LEN_VALUE_TYPE;
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switch (type)
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{
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case SVT_SERVER:
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ptr = process_server(monitor, ptr, crc_ptr);
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break;
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case SVT_MASTER:
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ptr = process_master(monitor, master, ptr, crc_ptr);
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break;
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default:
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MXS_ERROR("Possible corrupted journal file (unknown stored value). Ignoring.");
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return false;
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}
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mxb_assert(prevptr != ptr);
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MXB_AT_DEBUG(prevptr = ptr);
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}
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mxb_assert(ptr == crc_ptr);
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return true;
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}
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bool check_disk_space_exhausted(MonitorServer* pMs,
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const std::string& path,
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const maxscale::disk::SizesAndName& san,
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int32_t max_percentage)
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{
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bool disk_space_exhausted = false;
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int32_t used_percentage = ((san.total() - san.available()) / (double)san.total()) * 100;
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if (used_percentage >= max_percentage)
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{
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MXS_ERROR("Disk space on %s at %s is exhausted; %d%% of the the disk "
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"mounted on the path %s has been used, and the limit it %d%%.",
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pMs->server->name(),
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pMs->server->address,
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used_percentage,
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path.c_str(),
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max_percentage);
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disk_space_exhausted = true;
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}
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return disk_space_exhausted;
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}
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const char ERR_CANNOT_MODIFY[] =
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"The server is monitored, so only the maintenance status can be "
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"set/cleared manually. Status was not modified.";
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const char WRN_REQUEST_OVERWRITTEN[] =
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"Previous maintenance request was not yet read by the monitor and was overwritten.";
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}
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namespace maxscale
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{
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Monitor::Monitor(const string& name, const string& module)
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: m_name(name)
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, m_module(module)
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{
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memset(m_journal_hash, 0, sizeof(m_journal_hash));
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}
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void Monitor::stop()
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{
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do_stop();
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for (auto db : m_servers)
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{
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// TODO: Should be db->close().
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mysql_close(db->con);
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db->con = NULL;
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}
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}
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const char* Monitor::name() const
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{
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return m_name.c_str();
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}
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using std::chrono::milliseconds;
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using std::chrono::seconds;
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bool Monitor::configure(const MXS_CONFIG_PARAMETER* params)
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{
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m_settings.interval = params->get_duration<milliseconds>(CN_MONITOR_INTERVAL).count();
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m_settings.journal_max_age = params->get_duration<seconds>(CN_JOURNAL_MAX_AGE).count();
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m_settings.script_timeout = params->get_duration<seconds>(CN_SCRIPT_TIMEOUT).count();
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m_settings.script = params->get_string(CN_SCRIPT);
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m_settings.events = params->get_enum(CN_EVENTS, mxs_monitor_event_enum_values);
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MonitorServer::ConnectionSettings& conn_settings = m_settings.conn_settings;
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conn_settings.read_timeout = params->get_duration<seconds>(CN_BACKEND_READ_TIMEOUT).count();
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conn_settings.write_timeout = params->get_duration<seconds>(CN_BACKEND_WRITE_TIMEOUT).count();
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conn_settings.connect_timeout = params->get_duration<seconds>(CN_BACKEND_CONNECT_TIMEOUT).count();
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conn_settings.connect_attempts = params->get_integer(CN_BACKEND_CONNECT_ATTEMPTS);
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conn_settings.username = params->get_string(CN_USER);
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conn_settings.password = params->get_string(CN_PASSWORD);
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// Disk check interval is given in ms, duration is constructed from seconds.
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auto dsc_interval = params->get_duration<milliseconds>(CN_DISK_SPACE_CHECK_INTERVAL).count();
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// 0 implies disabling -> save negative value to interval.
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m_settings.disk_space_check_interval = (dsc_interval > 0) ?
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mxb::Duration(static_cast<double>(dsc_interval) / 1000) : mxb::Duration(-1);
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// The monitor serverlist has already been checked to be valid. Empty value is ok too.
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// First, remove all servers.
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remove_all_servers();
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auto servers_temp = params->get_server_list(CN_SERVERS);
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bool error = false;
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for (auto elem : servers_temp)
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{
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if (!add_server(elem))
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{
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error = true;
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}
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}
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/* The previous config values were normal types and were checked by the config manager
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* to be correct. The following is a complicated type and needs to be checked separately. */
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auto threshold_string = params->get_string(CN_DISK_SPACE_THRESHOLD);
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if (!set_disk_space_threshold(threshold_string))
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{
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MXS_ERROR("Invalid value for '%s' for monitor %s: %s",
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CN_DISK_SPACE_THRESHOLD, name(), threshold_string.c_str());
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error = true;
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}
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if (!error)
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{
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// Store module name into parameter storage.
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m_parameters.set(CN_MODULE, m_module);
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// Add all config settings to text-mode storage. Needed for serialization.
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m_parameters.set_multiple(*params);
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}
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return !error;
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}
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const MXS_CONFIG_PARAMETER& Monitor::parameters() const
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{
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return m_parameters;
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}
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const Monitor::Settings& Monitor::settings() const
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{
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return m_settings;
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}
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long Monitor::ticks() const
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{
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return m_ticks.load(std::memory_order_acquire);
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}
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const char* Monitor::state_string() const
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{
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return is_running() ? "Running" : "Stopped";
|
|
}
|
|
|
|
Monitor::~Monitor()
|
|
{
|
|
for (auto server : m_servers)
|
|
{
|
|
// TODO: store unique pointers in the array
|
|
delete server;
|
|
}
|
|
m_servers.clear();
|
|
}
|
|
|
|
/**
|
|
* Add a server to the monitor. Fails if server is already monitored.
|
|
*
|
|
* @param server A server
|
|
* @return True if server was added
|
|
*/
|
|
bool Monitor::add_server(SERVER* server)
|
|
{
|
|
// This should only be called from the admin thread while the monitor is stopped.
|
|
mxb_assert(!is_running() && is_admin_thread());
|
|
bool success = false;
|
|
string existing_owner;
|
|
if (this_unit.claim_server(server->name(), m_name, &existing_owner))
|
|
{
|
|
auto new_server = new MonitorServer(server, m_settings.disk_space_limits);
|
|
m_servers.push_back(new_server);
|
|
server_added(server);
|
|
success = true;
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Server '%s' is already monitored by '%s', cannot add it to another monitor.",
|
|
server->name(), existing_owner.c_str());
|
|
}
|
|
return success;
|
|
}
|
|
|
|
void Monitor::server_added(SERVER* server)
|
|
{
|
|
service_add_server(this, server);
|
|
}
|
|
|
|
void Monitor::server_removed(SERVER* server)
|
|
{
|
|
service_remove_server(this, server);
|
|
}
|
|
|
|
/**
|
|
* Remove all servers from the monitor.
|
|
*/
|
|
void Monitor::remove_all_servers()
|
|
{
|
|
// This should only be called from the admin thread while the monitor is stopped.
|
|
mxb_assert(!is_running() && is_admin_thread());
|
|
for (auto mon_server : m_servers)
|
|
{
|
|
mxb_assert(this_unit.claimed_by(mon_server->server->name()) == m_name);
|
|
this_unit.release_server(mon_server->server->name());
|
|
server_removed(mon_server->server);
|
|
delete mon_server;
|
|
}
|
|
m_servers.clear();
|
|
}
|
|
|
|
void Monitor::show(DCB* dcb)
|
|
{
|
|
dcb_printf(dcb, "Name: %s\n", name());
|
|
dcb_printf(dcb, "State: %s\n", state_string());
|
|
dcb_printf(dcb, "Times monitored: %li\n", ticks());
|
|
dcb_printf(dcb, "Sampling interval: %lu milliseconds\n", m_settings.interval);
|
|
dcb_printf(dcb, "Connect Timeout: %i seconds\n", m_settings.conn_settings.connect_timeout);
|
|
dcb_printf(dcb, "Read Timeout: %i seconds\n", m_settings.conn_settings.read_timeout);
|
|
dcb_printf(dcb, "Write Timeout: %i seconds\n", m_settings.conn_settings.write_timeout);
|
|
dcb_printf(dcb, "Connect attempts: %i \n", m_settings.conn_settings.connect_attempts);
|
|
dcb_printf(dcb, "Monitored servers: ");
|
|
|
|
const char* sep = "";
|
|
|
|
for (const auto& db : m_servers)
|
|
{
|
|
dcb_printf(dcb, "%s[%s]:%d", sep, db->server->address, db->server->port);
|
|
sep = ", ";
|
|
}
|
|
|
|
dcb_printf(dcb, "\n");
|
|
|
|
if (is_running())
|
|
{
|
|
diagnostics(dcb);
|
|
}
|
|
else
|
|
{
|
|
dcb_printf(dcb, " (no diagnostics)\n");
|
|
}
|
|
dcb_printf(dcb, "\n");
|
|
}
|
|
|
|
json_t* Monitor::to_json(const char* host) const
|
|
{
|
|
// This function mostly reads settings-type data, which is only written to by the admin thread,
|
|
// The rest is safe to read without mutexes.
|
|
mxb_assert(Monitor::is_admin_thread());
|
|
json_t* rval = json_object();
|
|
json_t* attr = json_object();
|
|
json_t* rel = json_object();
|
|
|
|
auto my_name = name();
|
|
json_object_set_new(rval, CN_ID, json_string(my_name));
|
|
json_object_set_new(rval, CN_TYPE, json_string(CN_MONITORS));
|
|
|
|
json_object_set_new(attr, CN_MODULE, json_string(m_module.c_str()));
|
|
json_object_set_new(attr, CN_STATE, json_string(state_string()));
|
|
json_object_set_new(attr, CN_TICKS, json_integer(ticks()));
|
|
|
|
/** Monitor parameters */
|
|
json_object_set_new(attr, CN_PARAMETERS, parameters_to_json());
|
|
|
|
if (is_running())
|
|
{
|
|
json_t* diag = diagnostics_json();
|
|
if (diag)
|
|
{
|
|
json_object_set_new(attr, CN_MONITOR_DIAGNOSTICS, diag);
|
|
}
|
|
}
|
|
|
|
if (!m_servers.empty())
|
|
{
|
|
json_t* mon_rel = mxs_json_relationship(host, MXS_JSON_API_SERVERS);
|
|
for (MonitorServer* db : m_servers)
|
|
{
|
|
mxs_json_add_relation(mon_rel, db->server->name(), CN_SERVERS);
|
|
}
|
|
json_object_set_new(rel, CN_SERVERS, mon_rel);
|
|
}
|
|
|
|
json_object_set_new(rval, CN_RELATIONSHIPS, rel);
|
|
json_object_set_new(rval, CN_ATTRIBUTES, attr);
|
|
json_object_set_new(rval, CN_LINKS, mxs_json_self_link(host, CN_MONITORS, my_name));
|
|
return rval;
|
|
}
|
|
|
|
json_t* Monitor::parameters_to_json() const
|
|
{
|
|
json_t* rval = json_object();
|
|
const MXS_MODULE* mod = get_module(m_module.c_str(), MODULE_MONITOR);
|
|
auto my_config = parameters();
|
|
config_add_module_params_json(&my_config,
|
|
{CN_TYPE, CN_MODULE, CN_SERVERS},
|
|
config_monitor_params,
|
|
mod->parameters,
|
|
rval);
|
|
return rval;
|
|
}
|
|
|
|
bool Monitor::test_permissions(const string& query)
|
|
{
|
|
if (m_servers.empty() || config_get_global_options()->skip_permission_checks)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
char* dpasswd = decrypt_password(m_settings.conn_settings.password.c_str());
|
|
bool rval = false;
|
|
|
|
for (MonitorServer* mondb : m_servers)
|
|
{
|
|
if (!connection_is_ok(mondb->ping_or_connect(m_settings.conn_settings)))
|
|
{
|
|
MXS_ERROR("[%s] Failed to connect to server '%s' ([%s]:%d) when"
|
|
" checking monitor user credentials and permissions: %s",
|
|
name(),
|
|
mondb->server->name(),
|
|
mondb->server->address,
|
|
mondb->server->port,
|
|
mysql_error(mondb->con));
|
|
switch (mysql_errno(mondb->con))
|
|
{
|
|
case ER_ACCESS_DENIED_ERROR:
|
|
case ER_DBACCESS_DENIED_ERROR:
|
|
case ER_ACCESS_DENIED_NO_PASSWORD_ERROR:
|
|
break;
|
|
|
|
default:
|
|
rval = true;
|
|
break;
|
|
}
|
|
}
|
|
else if (mxs_mysql_query(mondb->con, query.c_str()) != 0)
|
|
{
|
|
switch (mysql_errno(mondb->con))
|
|
{
|
|
case ER_TABLEACCESS_DENIED_ERROR:
|
|
case ER_COLUMNACCESS_DENIED_ERROR:
|
|
case ER_SPECIFIC_ACCESS_DENIED_ERROR:
|
|
case ER_PROCACCESS_DENIED_ERROR:
|
|
case ER_KILL_DENIED_ERROR:
|
|
rval = false;
|
|
break;
|
|
|
|
default:
|
|
rval = true;
|
|
break;
|
|
}
|
|
|
|
MXS_ERROR("[%s] Failed to execute query '%s' with user '%s'. MySQL error message: %s",
|
|
name(), query.c_str(), m_settings.conn_settings.username.c_str(),
|
|
mysql_error(mondb->con));
|
|
}
|
|
else
|
|
{
|
|
rval = true;
|
|
MYSQL_RES* res = mysql_use_result(mondb->con);
|
|
if (res == NULL)
|
|
{
|
|
MXS_ERROR("[%s] Result retrieval failed when checking monitor permissions: %s",
|
|
name(),
|
|
mysql_error(mondb->con));
|
|
}
|
|
else
|
|
{
|
|
mysql_free_result(res);
|
|
}
|
|
}
|
|
}
|
|
|
|
MXS_FREE(dpasswd);
|
|
return rval;
|
|
}
|
|
|
|
void MonitorServer::stash_current_status()
|
|
{
|
|
mon_prev_status = server->status;
|
|
pending_status = server->status;
|
|
}
|
|
|
|
void MonitorServer::set_pending_status(uint64_t bits)
|
|
{
|
|
pending_status |= bits;
|
|
}
|
|
|
|
void MonitorServer::clear_pending_status(uint64_t bits)
|
|
{
|
|
pending_status &= ~bits;
|
|
}
|
|
|
|
/*
|
|
* Determine a monitor event, defined by the difference between the old
|
|
* status of a server and the new status.
|
|
*
|
|
* @return monitor_event_t A monitor event (enum)
|
|
*
|
|
* @note This function must only be called from mon_process_state_changes
|
|
*/
|
|
mxs_monitor_event_t MonitorServer::get_event_type() const
|
|
{
|
|
typedef enum
|
|
{
|
|
DOWN_EVENT,
|
|
UP_EVENT,
|
|
LOSS_EVENT,
|
|
NEW_EVENT,
|
|
UNSUPPORTED_EVENT
|
|
} general_event_type;
|
|
|
|
general_event_type event_type = UNSUPPORTED_EVENT;
|
|
|
|
uint64_t prev = mon_prev_status & all_server_bits;
|
|
uint64_t present = server->status & all_server_bits;
|
|
|
|
if (prev == present)
|
|
{
|
|
/* This should never happen */
|
|
mxb_assert(false);
|
|
return UNDEFINED_EVENT;
|
|
}
|
|
|
|
if ((prev & SERVER_RUNNING) == 0)
|
|
{
|
|
/* The server was not running previously */
|
|
if ((present & SERVER_RUNNING) != 0)
|
|
{
|
|
event_type = UP_EVENT;
|
|
}
|
|
else
|
|
{
|
|
/* Otherwise, was not running and still is not running. This should never happen. */
|
|
mxb_assert(false);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Previous state must have been running */
|
|
if ((present & SERVER_RUNNING) == 0)
|
|
{
|
|
event_type = DOWN_EVENT;
|
|
}
|
|
else
|
|
{
|
|
/** These are used to detect whether we actually lost something or
|
|
* just transitioned from one state to another */
|
|
uint64_t prev_bits = prev & (SERVER_MASTER | SERVER_SLAVE);
|
|
uint64_t present_bits = present & (SERVER_MASTER | SERVER_SLAVE);
|
|
|
|
/* Was running and still is */
|
|
if ((!prev_bits || !present_bits || prev_bits == present_bits)
|
|
&& (prev & server_type_bits))
|
|
{
|
|
/* We used to know what kind of server it was */
|
|
event_type = LOSS_EVENT;
|
|
}
|
|
else
|
|
{
|
|
/* We didn't know what kind of server it was, now we do*/
|
|
event_type = NEW_EVENT;
|
|
}
|
|
}
|
|
}
|
|
|
|
mxs_monitor_event_t rval = UNDEFINED_EVENT;
|
|
|
|
switch (event_type)
|
|
{
|
|
case UP_EVENT:
|
|
rval = (present & SERVER_MASTER) ? MASTER_UP_EVENT :
|
|
(present & SERVER_SLAVE) ? SLAVE_UP_EVENT :
|
|
(present & SERVER_JOINED) ? SYNCED_UP_EVENT :
|
|
SERVER_UP_EVENT;
|
|
break;
|
|
|
|
case DOWN_EVENT:
|
|
rval = (prev & SERVER_MASTER) ? MASTER_DOWN_EVENT :
|
|
(prev & SERVER_SLAVE) ? SLAVE_DOWN_EVENT :
|
|
(prev & SERVER_JOINED) ? SYNCED_DOWN_EVENT :
|
|
SERVER_DOWN_EVENT;
|
|
break;
|
|
|
|
case LOSS_EVENT:
|
|
rval = (prev & SERVER_MASTER) ? LOST_MASTER_EVENT :
|
|
(prev & SERVER_SLAVE) ? LOST_SLAVE_EVENT :
|
|
(prev & SERVER_JOINED) ? LOST_SYNCED_EVENT :
|
|
UNDEFINED_EVENT;
|
|
break;
|
|
|
|
case NEW_EVENT:
|
|
rval = (present & SERVER_MASTER) ? NEW_MASTER_EVENT :
|
|
(present & SERVER_SLAVE) ? NEW_SLAVE_EVENT :
|
|
(present & SERVER_JOINED) ? NEW_SYNCED_EVENT :
|
|
UNDEFINED_EVENT;
|
|
break;
|
|
|
|
default:
|
|
/* This should never happen */
|
|
mxb_assert(false);
|
|
break;
|
|
}
|
|
|
|
mxb_assert(rval != UNDEFINED_EVENT);
|
|
return rval;
|
|
}
|
|
|
|
const char* Monitor::get_event_name(mxs_monitor_event_t event)
|
|
{
|
|
for (int i = 0; mxs_monitor_event_enum_values[i].name; i++)
|
|
{
|
|
if (mxs_monitor_event_enum_values[i].enum_value == event)
|
|
{
|
|
return mxs_monitor_event_enum_values[i].name;
|
|
}
|
|
}
|
|
|
|
mxb_assert(!true);
|
|
return "undefined_event";
|
|
}
|
|
|
|
const char* MonitorServer::get_event_name()
|
|
{
|
|
return Monitor::get_event_name((mxs_monitor_event_t) server->last_event);
|
|
}
|
|
|
|
void Monitor::append_node_names(char* dest, int len, int status, CredentialsApproach approach)
|
|
{
|
|
const char* separator = "";
|
|
// Some extra space for port and separator
|
|
char arr[SERVER::MAX_MONUSER_LEN + SERVER::MAX_MONPW_LEN + SERVER::MAX_ADDRESS_LEN + 64];
|
|
dest[0] = '\0';
|
|
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end() && len; ++iter)
|
|
{
|
|
Server* server = static_cast<Server*>((*iter)->server);
|
|
if (status == 0 || server->status & status)
|
|
{
|
|
if (approach == CredentialsApproach::EXCLUDE)
|
|
{
|
|
snprintf(arr,
|
|
sizeof(arr),
|
|
"%s[%s]:%d",
|
|
separator,
|
|
server->address,
|
|
server->port);
|
|
}
|
|
else
|
|
{
|
|
string user = m_settings.conn_settings.username;
|
|
string password = m_settings.conn_settings.password;
|
|
string server_specific_monuser = server->monitor_user();
|
|
if (!server_specific_monuser.empty())
|
|
{
|
|
user = server_specific_monuser;
|
|
password = server->monitor_password();
|
|
}
|
|
|
|
snprintf(arr,
|
|
sizeof(arr),
|
|
"%s%s:%s@[%s]:%d",
|
|
separator,
|
|
user.c_str(),
|
|
password.c_str(),
|
|
server->address,
|
|
server->port);
|
|
}
|
|
|
|
separator = ",";
|
|
int arrlen = strlen(arr);
|
|
|
|
if (arrlen < len)
|
|
{
|
|
strcat(dest, arr);
|
|
len -= arrlen;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if current monitored server status has changed.
|
|
*
|
|
* @return true if status has changed
|
|
*/
|
|
bool MonitorServer::status_changed()
|
|
{
|
|
bool rval = false;
|
|
|
|
/* Previous status is -1 if not yet set */
|
|
if (mon_prev_status != static_cast<uint64_t>(-1))
|
|
{
|
|
|
|
uint64_t old_status = mon_prev_status & all_server_bits;
|
|
uint64_t new_status = server->status & all_server_bits;
|
|
|
|
/**
|
|
* The state has changed if the relevant state bits are not the same,
|
|
* the server is either running, stopping or starting and the server is
|
|
* not going into maintenance or coming out of it
|
|
*/
|
|
if (old_status != new_status
|
|
&& ((old_status | new_status) & SERVER_MAINT) == 0
|
|
&& ((old_status | new_status) & SERVER_RUNNING) == SERVER_RUNNING)
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Check if current monitored server has a loggable failure status.
|
|
*
|
|
* @return true if failed status can be logged or false
|
|
*/
|
|
bool MonitorServer::should_print_fail_status()
|
|
{
|
|
return server->is_down() && mon_err_count == 0;
|
|
}
|
|
|
|
MonitorServer* Monitor::find_parent_node(MonitorServer* target)
|
|
{
|
|
MonitorServer* rval = NULL;
|
|
|
|
if (target->server->master_id > 0)
|
|
{
|
|
for (MonitorServer* node : m_servers)
|
|
{
|
|
if (node->server->node_id == target->server->master_id)
|
|
{
|
|
rval = node;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
std::string Monitor::child_nodes(MonitorServer* parent)
|
|
{
|
|
std::stringstream ss;
|
|
|
|
if (parent->server->node_id > 0)
|
|
{
|
|
bool have_content = false;
|
|
for (MonitorServer* node : m_servers)
|
|
{
|
|
if (node->server->master_id == parent->server->node_id)
|
|
{
|
|
if (have_content)
|
|
{
|
|
ss << ",";
|
|
}
|
|
|
|
ss << "[" << node->server->address << "]:" << node->server->port;
|
|
have_content = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return ss.str();
|
|
}
|
|
|
|
int Monitor::launch_command(MonitorServer* ptr, ExternalCmd* cmd)
|
|
{
|
|
if (externcmd_matches(cmd, "$INITIATOR"))
|
|
{
|
|
char initiator[strlen(ptr->server->address) + 24]; // Extra space for port
|
|
snprintf(initiator, sizeof(initiator), "[%s]:%d", ptr->server->address, ptr->server->port);
|
|
externcmd_substitute_arg(cmd, "[$]INITIATOR", initiator);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$PARENT"))
|
|
{
|
|
std::stringstream ss;
|
|
MonitorServer* parent = find_parent_node(ptr);
|
|
|
|
if (parent)
|
|
{
|
|
ss << "[" << parent->server->address << "]:" << parent->server->port;
|
|
}
|
|
externcmd_substitute_arg(cmd, "[$]PARENT", ss.str().c_str());
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$CHILDREN"))
|
|
{
|
|
externcmd_substitute_arg(cmd, "[$]CHILDREN", child_nodes(ptr).c_str());
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$EVENT"))
|
|
{
|
|
externcmd_substitute_arg(cmd, "[$]EVENT", ptr->get_event_name());
|
|
}
|
|
|
|
char nodelist[PATH_MAX + MON_ARG_MAX + 1] = {'\0'};
|
|
|
|
if (externcmd_matches(cmd, "$CREDENTIALS"))
|
|
{
|
|
// We provide the credentials for _all_ servers.
|
|
append_node_names(nodelist, sizeof(nodelist), 0, CredentialsApproach::INCLUDE);
|
|
externcmd_substitute_arg(cmd, "[$]CREDENTIALS", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$NODELIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_RUNNING);
|
|
externcmd_substitute_arg(cmd, "[$]NODELIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$LIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), 0);
|
|
externcmd_substitute_arg(cmd, "[$]LIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$MASTERLIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_MASTER);
|
|
externcmd_substitute_arg(cmd, "[$]MASTERLIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$SLAVELIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_SLAVE);
|
|
externcmd_substitute_arg(cmd, "[$]SLAVELIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$SYNCEDLIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_JOINED);
|
|
externcmd_substitute_arg(cmd, "[$]SYNCEDLIST", nodelist);
|
|
}
|
|
|
|
int rv = cmd->externcmd_execute();
|
|
|
|
if (rv)
|
|
{
|
|
if (rv == -1)
|
|
{
|
|
// Internal error
|
|
MXS_ERROR("Failed to execute script '%s' on server state change event '%s'",
|
|
cmd->argv[0],
|
|
ptr->get_event_name());
|
|
}
|
|
else
|
|
{
|
|
// Script returned a non-zero value
|
|
MXS_ERROR("Script '%s' returned %d on event '%s'",
|
|
cmd->argv[0],
|
|
rv,
|
|
ptr->get_event_name());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(cmd->argv != NULL && cmd->argv[0] != NULL);
|
|
// Construct a string with the script + arguments
|
|
char* scriptStr = NULL;
|
|
int totalStrLen = 0;
|
|
bool memError = false;
|
|
for (int i = 0; cmd->argv[i]; i++)
|
|
{
|
|
totalStrLen += strlen(cmd->argv[i]) + 1; // +1 for space and one \0
|
|
}
|
|
int spaceRemaining = totalStrLen;
|
|
if ((scriptStr = (char*)MXS_CALLOC(totalStrLen, sizeof(char))) != NULL)
|
|
{
|
|
char* currentPos = scriptStr;
|
|
// The script name should not begin with a space
|
|
int len = snprintf(currentPos, spaceRemaining, "%s", cmd->argv[0]);
|
|
currentPos += len;
|
|
spaceRemaining -= len;
|
|
|
|
for (int i = 1; cmd->argv[i]; i++)
|
|
{
|
|
if ((cmd->argv[i])[0] == '\0')
|
|
{
|
|
continue; // Empty argument, print nothing
|
|
}
|
|
len = snprintf(currentPos, spaceRemaining, " %s", cmd->argv[i]);
|
|
currentPos += len;
|
|
spaceRemaining -= len;
|
|
}
|
|
mxb_assert(spaceRemaining > 0);
|
|
*currentPos = '\0';
|
|
}
|
|
else
|
|
{
|
|
memError = true;
|
|
scriptStr = cmd->argv[0]; // print at least something
|
|
}
|
|
|
|
MXS_NOTICE("Executed monitor script '%s' on event '%s'",
|
|
scriptStr,
|
|
ptr->get_event_name());
|
|
|
|
if (!memError)
|
|
{
|
|
MXS_FREE(scriptStr);
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
int Monitor::launch_script(MonitorServer* ptr)
|
|
{
|
|
const char* script = m_settings.script.c_str();
|
|
char arg[strlen(script) + 1];
|
|
strcpy(arg, script);
|
|
|
|
ExternalCmd* cmd = ExternalCmd::externcmd_allocate(arg, m_settings.script_timeout);
|
|
|
|
if (cmd == NULL)
|
|
{
|
|
MXS_ERROR("Failed to initialize script '%s'. See previous errors for the "
|
|
"cause of this failure.",
|
|
script);
|
|
return -1;
|
|
}
|
|
|
|
int rv = launch_command(ptr, cmd);
|
|
|
|
ExternalCmd::externcmd_free(cmd);
|
|
|
|
return rv;
|
|
}
|
|
|
|
MonitorServer::ConnectResult
|
|
Monitor::ping_or_connect_to_db(const MonitorServer::ConnectionSettings& sett, SERVER& server, MYSQL** ppConn)
|
|
{
|
|
mxb_assert(ppConn);
|
|
auto pConn = *ppConn;
|
|
if (pConn)
|
|
{
|
|
/** Return if the connection is OK */
|
|
if (mysql_ping(pConn) == 0)
|
|
{
|
|
return ConnectResult::OLDCONN_OK;
|
|
}
|
|
/** Otherwise close the handle. */
|
|
mysql_close(pConn);
|
|
}
|
|
|
|
ConnectResult conn_result = ConnectResult::REFUSED;
|
|
if ((pConn = mysql_init(NULL)) != nullptr)
|
|
{
|
|
string uname = sett.username;
|
|
string passwd = sett.password;
|
|
const Server& srv = static_cast<const Server&>(server); // Clean this up later.
|
|
string server_specific_monuser = srv.monitor_user();
|
|
if (!server_specific_monuser.empty())
|
|
{
|
|
uname = server_specific_monuser;
|
|
passwd = srv.monitor_password();
|
|
}
|
|
char* dpwd = decrypt_password(passwd.c_str());
|
|
|
|
mysql_optionsv(pConn, MYSQL_OPT_CONNECT_TIMEOUT, &sett.connect_timeout);
|
|
mysql_optionsv(pConn, MYSQL_OPT_READ_TIMEOUT, &sett.read_timeout);
|
|
mysql_optionsv(pConn, MYSQL_OPT_WRITE_TIMEOUT, &sett.write_timeout);
|
|
mysql_optionsv(pConn, MYSQL_PLUGIN_DIR, get_connector_plugindir());
|
|
|
|
time_t start = 0;
|
|
time_t end = 0;
|
|
for (int i = 0; i < sett.connect_attempts; i++)
|
|
{
|
|
start = time(NULL);
|
|
bool result = (mxs_mysql_real_connect(pConn, &server, uname.c_str(), dpwd) != NULL);
|
|
end = time(NULL);
|
|
|
|
if (result)
|
|
{
|
|
conn_result = ConnectResult::NEWCONN_OK;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (conn_result == ConnectResult::REFUSED && difftime(end, start) >= sett.connect_timeout)
|
|
{
|
|
conn_result = ConnectResult::TIMEOUT;
|
|
}
|
|
MXS_FREE(dpwd);
|
|
}
|
|
|
|
*ppConn = pConn;
|
|
return conn_result;
|
|
}
|
|
|
|
ConnectResult MonitorServer::ping_or_connect(const ConnectionSettings& settings)
|
|
{
|
|
return Monitor::ping_or_connect_to_db(settings, *server, &con);
|
|
}
|
|
|
|
/**
|
|
* Is the return value one of the 'OK' values.
|
|
*
|
|
* @param connect_result Return value of mon_ping_or_connect_to_db
|
|
* @return True of connection is ok
|
|
*/
|
|
bool Monitor::connection_is_ok(ConnectResult connect_result)
|
|
{
|
|
return connect_result == ConnectResult::OLDCONN_OK || connect_result == ConnectResult::NEWCONN_OK;
|
|
}
|
|
|
|
string Monitor::get_server_monitor(const SERVER* server)
|
|
{
|
|
return this_unit.claimed_by(server->name());
|
|
}
|
|
|
|
bool Monitor::is_admin_thread()
|
|
{
|
|
mxb::Worker* current = mxb::Worker::get_current();
|
|
return current == nullptr || current == mxs_rworker_get(MXS_RWORKER_MAIN);
|
|
}
|
|
|
|
/**
|
|
* Log an error about the failure to connect to a backend server and why it happened.
|
|
*
|
|
* @param rval Return value of mon_ping_or_connect_to_db
|
|
*/
|
|
void MonitorServer::log_connect_error(ConnectResult rval)
|
|
{
|
|
mxb_assert(!Monitor::connection_is_ok(rval));
|
|
const char TIMED_OUT[] = "Monitor timed out when connecting to server %s[%s:%d] : '%s'";
|
|
const char REFUSED[] = "Monitor was unable to connect to server %s[%s:%d] : '%s'";
|
|
MXS_ERROR(rval == ConnectResult::TIMEOUT ? TIMED_OUT : REFUSED,
|
|
server->name(),
|
|
server->address,
|
|
server->port,
|
|
mysql_error(con));
|
|
}
|
|
|
|
void MonitorServer::log_state_change()
|
|
{
|
|
string prev = SERVER::status_to_string(mon_prev_status);
|
|
string next = server->status_string();
|
|
MXS_NOTICE("Server changed state: %s[%s:%u]: %s. [%s] -> [%s]",
|
|
server->name(), server->address, server->port,
|
|
get_event_name(),
|
|
prev.c_str(), next.c_str());
|
|
}
|
|
|
|
void Monitor::hangup_failed_servers()
|
|
{
|
|
for (MonitorServer* ptr : m_servers)
|
|
{
|
|
if (ptr->status_changed() && (!(ptr->server->is_usable()) || !(ptr->server->is_in_cluster())))
|
|
{
|
|
dcb_hangup_foreach(ptr->server);
|
|
}
|
|
}
|
|
}
|
|
|
|
void MonitorServer::mon_report_query_error()
|
|
{
|
|
MXS_ERROR("Failed to execute query on server '%s' ([%s]:%d): %s",
|
|
server->name(),
|
|
server->address,
|
|
server->port,
|
|
mysql_error(con));
|
|
}
|
|
|
|
/**
|
|
* Check if admin is requesting setting or clearing maintenance status on the server and act accordingly.
|
|
* Should be called at the beginning of a monitor loop.
|
|
*/
|
|
void Monitor::check_maintenance_requests()
|
|
{
|
|
/* In theory, the admin may be modifying the server maintenance status during this function. The overall
|
|
* maintenance flag should be read-written atomically to prevent missing a value. */
|
|
bool was_pending = m_status_change_pending.exchange(false, std::memory_order_acq_rel);
|
|
if (was_pending)
|
|
{
|
|
for (auto ptr : m_servers)
|
|
{
|
|
// The admin can only modify the [Maintenance] and [Drain] bits.
|
|
int admin_msg = atomic_exchange_int(&ptr->status_request, MonitorServer::NO_CHANGE);
|
|
|
|
switch (admin_msg)
|
|
{
|
|
case MonitorServer::MAINT_ON:
|
|
ptr->server->set_status(SERVER_MAINT);
|
|
break;
|
|
|
|
case MonitorServer::MAINT_OFF:
|
|
ptr->server->clear_status(SERVER_MAINT);
|
|
break;
|
|
|
|
case MonitorServer::BEING_DRAINED_ON:
|
|
ptr->server->set_status(SERVER_DRAINING);
|
|
break;
|
|
|
|
case MonitorServer::BEING_DRAINED_OFF:
|
|
ptr->server->clear_status(SERVER_DRAINING);
|
|
break;
|
|
|
|
case MonitorServer::NO_CHANGE:
|
|
break;
|
|
|
|
default:
|
|
mxb_assert(!true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Monitor::detect_handle_state_changes()
|
|
{
|
|
bool master_down = false;
|
|
bool master_up = false;
|
|
|
|
for (MonitorServer* ptr : m_servers)
|
|
{
|
|
if (ptr->status_changed())
|
|
{
|
|
/**
|
|
* The last executed event will be needed if a passive MaxScale is
|
|
* promoted to an active one and the last event that occurred on
|
|
* a server was a master_down event.
|
|
*
|
|
* In this case, a failover script should be called if no master_up
|
|
* or new_master events are triggered within a pre-defined time limit.
|
|
*/
|
|
mxs_monitor_event_t event = ptr->get_event_type();
|
|
ptr->server->last_event = event;
|
|
ptr->server->triggered_at = mxs_clock();
|
|
ptr->log_state_change();
|
|
|
|
if (event == MASTER_DOWN_EVENT)
|
|
{
|
|
master_down = true;
|
|
}
|
|
else if (event == MASTER_UP_EVENT || event == NEW_MASTER_EVENT)
|
|
{
|
|
master_up = true;
|
|
}
|
|
|
|
if (!m_settings.script.empty() && (event & m_settings.events))
|
|
{
|
|
launch_script(ptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (master_down && master_up)
|
|
{
|
|
MXS_NOTICE("Master switch detected: lost a master and gained a new one");
|
|
}
|
|
}
|
|
|
|
int Monitor::get_data_file_path(char* path) const
|
|
{
|
|
int rv = snprintf(path, PATH_MAX, journal_template, get_datadir(), name(), journal_name);
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* @brief Open stored journal file
|
|
*
|
|
* @param monitor Monitor to reload
|
|
* @param path Output where path is stored
|
|
* @return Opened file or NULL on error
|
|
*/
|
|
FILE* Monitor::open_data_file(Monitor* monitor, char* path)
|
|
{
|
|
FILE* rval = NULL;
|
|
int nbytes = monitor->get_data_file_path(path);
|
|
|
|
if (nbytes < PATH_MAX)
|
|
{
|
|
if ((rval = fopen(path, "rb")) == NULL && errno != ENOENT)
|
|
{
|
|
MXS_ERROR("Failed to open journal file: %d, %s", errno, mxs_strerror(errno));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Path is too long: %d characters exceeds the maximum path "
|
|
"length of %d bytes",
|
|
nbytes,
|
|
PATH_MAX);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
void Monitor::store_server_journal(MonitorServer* master)
|
|
{
|
|
auto monitor = this; // TODO: cleanup later
|
|
/** Calculate how much memory we need to allocate */
|
|
uint32_t size = MMB_LEN_SCHEMA_VERSION + MMB_LEN_CRC32;
|
|
|
|
for (MonitorServer* db : m_servers)
|
|
{
|
|
/** Each server is stored as a type byte and a null-terminated string
|
|
* followed by eight byte server status. */
|
|
size += MMB_LEN_VALUE_TYPE + strlen(db->server->name()) + 1 + MMB_LEN_SERVER_STATUS;
|
|
}
|
|
|
|
if (master)
|
|
{
|
|
/** The master server name is stored as a null terminated string */
|
|
size += MMB_LEN_VALUE_TYPE + strlen(master->server->name()) + 1;
|
|
}
|
|
|
|
/** 4 bytes for file length, 1 byte for schema version and 4 bytes for CRC32 */
|
|
uint32_t buffer_size = size + MMB_LEN_BYTES;
|
|
uint8_t* data = (uint8_t*)MXS_MALLOC(buffer_size);
|
|
char path[PATH_MAX + 1];
|
|
|
|
if (data)
|
|
{
|
|
/** Store the data in memory first and compare the current hash to
|
|
* the hash of the last stored journal. This isn't a fool-proof
|
|
* method of detecting changes but any failures are mainly of
|
|
* theoretical nature. */
|
|
store_data(monitor, master, data, size);
|
|
uint8_t hash[SHA_DIGEST_LENGTH];
|
|
SHA1(data, size, hash);
|
|
|
|
if (memcmp(monitor->m_journal_hash, hash, sizeof(hash)) != 0)
|
|
{
|
|
FILE* file = open_tmp_file(monitor, path);
|
|
|
|
if (file)
|
|
{
|
|
/** Write the data to a temp file and rename it to the final name */
|
|
if (fwrite(data, 1, buffer_size, file) == buffer_size && fflush(file) == 0)
|
|
{
|
|
if (!rename_tmp_file(monitor, path))
|
|
{
|
|
unlink(path);
|
|
}
|
|
else
|
|
{
|
|
memcpy(monitor->m_journal_hash, hash, sizeof(hash));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to write journal data to disk: %d, %s",
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
fclose(file);
|
|
}
|
|
}
|
|
}
|
|
MXS_FREE(data);
|
|
}
|
|
|
|
void Monitor::load_server_journal(MonitorServer** master)
|
|
{
|
|
auto monitor = this; // TODO: cleanup later
|
|
char path[PATH_MAX];
|
|
FILE* file = open_data_file(monitor, path);
|
|
|
|
if (file)
|
|
{
|
|
uint32_t size = 0;
|
|
size_t bytes = fread(&size, 1, MMB_LEN_BYTES, file);
|
|
mxb_assert(sizeof(size) == MMB_LEN_BYTES);
|
|
|
|
if (bytes == MMB_LEN_BYTES)
|
|
{
|
|
/** Payload contents:
|
|
*
|
|
* - One byte of schema version
|
|
* - `size - 5` bytes of data
|
|
* - Trailing 4 bytes of CRC32
|
|
*/
|
|
char* data = (char*)MXS_MALLOC(size);
|
|
|
|
if (data && (bytes = fread(data, 1, size, file)) == size)
|
|
{
|
|
if (*data == MMB_SCHEMA_VERSION)
|
|
{
|
|
if (check_crc32((uint8_t*)data,
|
|
size - MMB_LEN_CRC32,
|
|
(uint8_t*)data + size - MMB_LEN_CRC32))
|
|
{
|
|
if (process_data_file(monitor,
|
|
master,
|
|
data + MMB_LEN_SCHEMA_VERSION,
|
|
data + size - MMB_LEN_CRC32))
|
|
{
|
|
MXS_NOTICE("Loaded server states from journal file: %s", path);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("CRC32 mismatch in journal file. Ignoring.");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Unknown journal schema version: %d", (int)*data);
|
|
}
|
|
}
|
|
else if (data)
|
|
{
|
|
if (ferror(file))
|
|
{
|
|
MXS_ERROR("Failed to read journal file: %d, %s", errno, mxs_strerror(errno));
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to read journal file: Expected %u bytes, "
|
|
"read %lu bytes.",
|
|
size,
|
|
bytes);
|
|
}
|
|
}
|
|
MXS_FREE(data);
|
|
}
|
|
else
|
|
{
|
|
if (ferror(file))
|
|
{
|
|
MXS_ERROR("Failed to read journal file length: %d, %s",
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to read journal file length: Expected %d bytes, "
|
|
"read %lu bytes.",
|
|
MMB_LEN_BYTES,
|
|
bytes);
|
|
}
|
|
}
|
|
|
|
fclose(file);
|
|
}
|
|
}
|
|
|
|
void Monitor::remove_server_journal()
|
|
{
|
|
char path[PATH_MAX];
|
|
if (get_data_file_path(path) < PATH_MAX)
|
|
{
|
|
unlink(path);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Path to monitor journal directory is too long.");
|
|
}
|
|
}
|
|
|
|
bool Monitor::journal_is_stale() const
|
|
{
|
|
bool is_stale = true;
|
|
char path[PATH_MAX];
|
|
auto max_age = m_settings.journal_max_age;
|
|
if (get_data_file_path(path) < PATH_MAX)
|
|
{
|
|
struct stat st;
|
|
|
|
if (stat(path, &st) == 0)
|
|
{
|
|
time_t tdiff = time(NULL) - st.st_mtim.tv_sec;
|
|
|
|
if (tdiff >= max_age)
|
|
{
|
|
MXS_WARNING("Journal file was created %ld seconds ago. Maximum journal "
|
|
"age is %ld seconds.",
|
|
tdiff,
|
|
max_age);
|
|
}
|
|
else
|
|
{
|
|
is_stale = false;
|
|
}
|
|
}
|
|
else if (errno != ENOENT)
|
|
{
|
|
MXS_ERROR("Failed to inspect journal file: %d, %s", errno, mxs_strerror(errno));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Path to monitor journal directory is too long.");
|
|
}
|
|
|
|
return is_stale;
|
|
}
|
|
|
|
MonitorServer* Monitor::get_monitored_server(SERVER* search_server)
|
|
{
|
|
mxb_assert(search_server);
|
|
for (const auto iter : m_servers)
|
|
{
|
|
if (iter->server == search_server)
|
|
{
|
|
return iter;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
std::vector<MonitorServer*> Monitor::get_monitored_serverlist(const string& key, bool* error_out)
|
|
{
|
|
std::vector<MonitorServer*> monitored_array;
|
|
// Check that value exists.
|
|
if (!m_parameters.contains(key))
|
|
{
|
|
return monitored_array;
|
|
}
|
|
|
|
string name_error;
|
|
auto servers = m_parameters.get_server_list(key, &name_error);
|
|
if (!servers.empty())
|
|
{
|
|
// All servers in the array must be monitored by the given monitor.
|
|
for (auto elem : servers)
|
|
{
|
|
MonitorServer* mon_serv = get_monitored_server(elem);
|
|
if (mon_serv)
|
|
{
|
|
monitored_array.push_back(mon_serv);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Server '%s' is not monitored by monitor '%s'.", elem->name(), name());
|
|
*error_out = true;
|
|
}
|
|
}
|
|
|
|
if (monitored_array.size() < servers.size())
|
|
{
|
|
monitored_array.clear();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Serverlist setting '%s' contains invalid server name '%s'.",
|
|
key.c_str(), name_error.c_str());
|
|
*error_out = true;
|
|
}
|
|
|
|
return monitored_array;
|
|
}
|
|
|
|
bool Monitor::set_disk_space_threshold(const string& dst_setting)
|
|
{
|
|
mxb_assert(!is_running());
|
|
SERVER::DiskSpaceLimits new_dst;
|
|
bool rv = config_parse_disk_space_threshold(&new_dst, dst_setting.c_str());
|
|
if (rv)
|
|
{
|
|
m_settings.disk_space_limits = new_dst;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
bool Monitor::set_server_status(SERVER* srv, int bit, string* errmsg_out)
|
|
{
|
|
MonitorServer* msrv = get_monitored_server(srv);
|
|
mxb_assert(msrv);
|
|
|
|
if (!msrv)
|
|
{
|
|
MXS_ERROR("Monitor %s requested to set status of server %s that it does not monitor.",
|
|
name(), srv->address);
|
|
return false;
|
|
}
|
|
|
|
bool written = false;
|
|
|
|
if (is_running())
|
|
{
|
|
/* This server is monitored, in which case modifying any other status bit than Maintenance is
|
|
* disallowed. */
|
|
if (bit & ~(SERVER_MAINT | SERVER_DRAINING))
|
|
{
|
|
MXS_ERROR(ERR_CANNOT_MODIFY);
|
|
if (errmsg_out)
|
|
{
|
|
*errmsg_out = ERR_CANNOT_MODIFY;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Maintenance and being-drained are set/cleared using a special variable which the
|
|
* monitor reads when starting the next update cycle. */
|
|
|
|
int request;
|
|
if (bit & SERVER_MAINT)
|
|
{
|
|
request = MonitorServer::MAINT_ON;
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(bit & SERVER_DRAINING);
|
|
request = MonitorServer::BEING_DRAINED_ON;
|
|
}
|
|
|
|
int previous_request = atomic_exchange_int(&msrv->status_request, request);
|
|
written = true;
|
|
// Warn if the previous request hasn't been read.
|
|
if (previous_request != MonitorServer::NO_CHANGE)
|
|
{
|
|
MXS_WARNING(WRN_REQUEST_OVERWRITTEN);
|
|
}
|
|
// Also set a flag so the next loop happens sooner.
|
|
m_status_change_pending.store(true, std::memory_order_release);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The monitor is not running, the bit can be set directly */
|
|
srv->set_status(bit);
|
|
written = true;
|
|
}
|
|
|
|
return written;
|
|
}
|
|
|
|
bool Monitor::clear_server_status(SERVER* srv, int bit, string* errmsg_out)
|
|
{
|
|
MonitorServer* msrv = get_monitored_server(srv);
|
|
mxb_assert(msrv);
|
|
|
|
if (!msrv)
|
|
{
|
|
MXS_ERROR("Monitor %s requested to clear status of server %s that it does not monitor.",
|
|
name(), srv->address);
|
|
return false;
|
|
}
|
|
|
|
bool written = false;
|
|
|
|
if (is_running())
|
|
{
|
|
if (bit & ~(SERVER_MAINT | SERVER_DRAINING))
|
|
{
|
|
MXS_ERROR(ERR_CANNOT_MODIFY);
|
|
if (errmsg_out)
|
|
{
|
|
*errmsg_out = ERR_CANNOT_MODIFY;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int request;
|
|
if (bit & SERVER_MAINT)
|
|
{
|
|
request = MonitorServer::MAINT_OFF;
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(bit & SERVER_DRAINING);
|
|
request = MonitorServer::BEING_DRAINED_OFF;
|
|
}
|
|
|
|
int previous_request = atomic_exchange_int(&msrv->status_request, request);
|
|
written = true;
|
|
// Warn if the previous request hasn't been read.
|
|
if (previous_request != MonitorServer::NO_CHANGE)
|
|
{
|
|
MXS_WARNING(WRN_REQUEST_OVERWRITTEN);
|
|
}
|
|
// Also set a flag so the next loop happens sooner.
|
|
m_status_change_pending.store(true, std::memory_order_release);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The monitor is not running, the bit can be cleared directly */
|
|
srv->clear_status(bit);
|
|
written = true;
|
|
}
|
|
|
|
return written;
|
|
}
|
|
|
|
void Monitor::populate_services()
|
|
{
|
|
mxb_assert(!is_running());
|
|
|
|
for (MonitorServer* pMs : m_servers)
|
|
{
|
|
service_add_server(this, pMs->server);
|
|
}
|
|
}
|
|
|
|
void Monitor::deactivate()
|
|
{
|
|
if (is_running())
|
|
{
|
|
stop();
|
|
}
|
|
remove_all_servers();
|
|
}
|
|
|
|
bool Monitor::check_disk_space_this_tick()
|
|
{
|
|
bool should_update_disk_space = false;
|
|
auto check_interval = m_settings.disk_space_check_interval;
|
|
|
|
if ((check_interval.secs() > 0) && m_disk_space_checked.split() > check_interval)
|
|
{
|
|
should_update_disk_space = true;
|
|
// Whether or not disk space check succeeds, reset the timer. This way, disk space is always
|
|
// checked during the same tick for all servers.
|
|
m_disk_space_checked.restart();
|
|
}
|
|
return should_update_disk_space;
|
|
}
|
|
|
|
bool Monitor::server_status_request_waiting() const
|
|
{
|
|
return m_status_change_pending.load(std::memory_order_acquire);
|
|
}
|
|
|
|
const Monitor::ServerVector& Monitor::servers() const
|
|
{
|
|
return m_servers;
|
|
}
|
|
|
|
MonitorWorker::MonitorWorker(const string& name, const string& module)
|
|
: Monitor(name, module)
|
|
, m_thread_running(false)
|
|
, m_shutdown(0)
|
|
, m_checked(false)
|
|
, m_loop_called(get_time_ms())
|
|
{
|
|
}
|
|
|
|
MonitorWorker::~MonitorWorker()
|
|
{
|
|
}
|
|
|
|
bool MonitorWorker::is_running() const
|
|
{
|
|
return (Worker::state() != Worker::STOPPED);
|
|
}
|
|
|
|
void MonitorWorker::do_stop()
|
|
{
|
|
// This should only be called by monitor_stop().
|
|
mxb_assert(Monitor::is_admin_thread());
|
|
mxb_assert(is_running());
|
|
mxb_assert(m_thread_running.load() == true);
|
|
|
|
Worker::shutdown();
|
|
Worker::join();
|
|
m_thread_running.store(false, std::memory_order_release);
|
|
}
|
|
|
|
void MonitorWorker::diagnostics(DCB* pDcb) const
|
|
{
|
|
}
|
|
|
|
json_t* MonitorWorker::diagnostics_json() const
|
|
{
|
|
return json_object();
|
|
}
|
|
|
|
bool MonitorWorker::start()
|
|
{
|
|
// This should only be called by monitor_start(). NULL worker is allowed since the main worker may
|
|
// not exist during program start/stop.
|
|
mxb_assert(Monitor::is_admin_thread());
|
|
mxb_assert(!is_running());
|
|
mxb_assert(m_thread_running.load() == false);
|
|
|
|
if (journal_is_stale())
|
|
{
|
|
MXS_WARNING("Removing stale journal file for monitor '%s'.", name());
|
|
remove_server_journal();
|
|
}
|
|
|
|
if (!m_checked)
|
|
{
|
|
if (!has_sufficient_permissions())
|
|
{
|
|
MXS_ERROR("Failed to start monitor. See earlier errors for more information.");
|
|
}
|
|
else
|
|
{
|
|
m_checked = true;
|
|
}
|
|
}
|
|
|
|
bool started = false;
|
|
if (m_checked)
|
|
{
|
|
m_loop_called = get_time_ms() - settings().interval; // Next tick should happen immediately.
|
|
if (!Worker::start())
|
|
{
|
|
MXS_ERROR("Failed to start worker for monitor '%s'.", name());
|
|
}
|
|
else
|
|
{
|
|
// Ok, so the thread started. Let's wait until we can be certain the
|
|
// state has been updated.
|
|
m_semaphore.wait();
|
|
|
|
started = m_thread_running.load(std::memory_order_acquire);
|
|
if (!started)
|
|
{
|
|
// Ok, so the initialization failed and the thread will exit.
|
|
// We need to wait on it so that the thread resources will not leak.
|
|
Worker::join();
|
|
}
|
|
}
|
|
}
|
|
return started;
|
|
}
|
|
|
|
// static
|
|
int64_t MonitorWorker::get_time_ms()
|
|
{
|
|
timespec t;
|
|
|
|
MXB_AT_DEBUG(int rv = ) clock_gettime(CLOCK_MONOTONIC_COARSE, &t);
|
|
mxb_assert(rv == 0);
|
|
|
|
return t.tv_sec * 1000 + (t.tv_nsec / 1000000);
|
|
}
|
|
|
|
bool MonitorServer::can_update_disk_space_status() const
|
|
{
|
|
return ok_to_check_disk_space && (!monitor_limits.empty() || server->have_disk_space_limits());
|
|
}
|
|
|
|
void MonitorServer::update_disk_space_status()
|
|
{
|
|
auto pMs = this; // TODO: Clean
|
|
std::map<std::string, disk::SizesAndName> info;
|
|
|
|
int rv = disk::get_info_by_path(pMs->con, &info);
|
|
|
|
if (rv == 0)
|
|
{
|
|
// Server-specific setting takes precedence.
|
|
auto dst = pMs->server->get_disk_space_limits();
|
|
if (dst.empty())
|
|
{
|
|
dst = monitor_limits;
|
|
}
|
|
|
|
bool disk_space_exhausted = false;
|
|
int32_t star_max_percentage = -1;
|
|
std::set<std::string> checked_paths;
|
|
|
|
for (const auto& dst_item : dst)
|
|
{
|
|
string path = dst_item.first;
|
|
int32_t max_percentage = dst_item.second;
|
|
|
|
if (path == "*")
|
|
{
|
|
star_max_percentage = max_percentage;
|
|
}
|
|
else
|
|
{
|
|
auto j = info.find(path);
|
|
|
|
if (j != info.end())
|
|
{
|
|
const disk::SizesAndName& san = j->second;
|
|
|
|
disk_space_exhausted = check_disk_space_exhausted(pMs, path, san, max_percentage);
|
|
checked_paths.insert(path);
|
|
}
|
|
else
|
|
{
|
|
MXS_WARNING("Disk space threshold specified for %s even though server %s at %s"
|
|
"does not have that.",
|
|
path.c_str(),
|
|
pMs->server->name(),
|
|
pMs->server->address);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (star_max_percentage != -1)
|
|
{
|
|
for (auto j = info.begin(); j != info.end(); ++j)
|
|
{
|
|
string path = j->first;
|
|
|
|
if (checked_paths.find(path) == checked_paths.end())
|
|
{
|
|
const disk::SizesAndName& san = j->second;
|
|
|
|
disk_space_exhausted = check_disk_space_exhausted(pMs, path, san, star_max_percentage);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (disk_space_exhausted)
|
|
{
|
|
pMs->pending_status |= SERVER_DISK_SPACE_EXHAUSTED;
|
|
}
|
|
else
|
|
{
|
|
pMs->pending_status &= ~SERVER_DISK_SPACE_EXHAUSTED;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
SERVER* pServer = pMs->server;
|
|
|
|
if (mysql_errno(pMs->con) == ER_UNKNOWN_TABLE)
|
|
{
|
|
// Disable disk space checking for this server.
|
|
pMs->ok_to_check_disk_space = false;
|
|
|
|
MXS_ERROR("Disk space cannot be checked for %s at %s, because either the "
|
|
"version (%s) is too old, or the DISKS information schema plugin "
|
|
"has not been installed. Disk space checking has been disabled.",
|
|
pServer->name(),
|
|
pServer->address,
|
|
pServer->version_string().c_str());
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Checking the disk space for %s at %s failed due to: (%d) %s",
|
|
pServer->name(),
|
|
pServer->address,
|
|
mysql_errno(pMs->con),
|
|
mysql_error(pMs->con));
|
|
}
|
|
}
|
|
}
|
|
|
|
bool MonitorWorker::configure(const MXS_CONFIG_PARAMETER* pParams)
|
|
{
|
|
return Monitor::configure(pParams);
|
|
}
|
|
|
|
bool MonitorWorker::has_sufficient_permissions()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
void MonitorWorker::flush_server_status()
|
|
{
|
|
for (MonitorServer* pMs : servers())
|
|
{
|
|
if (!pMs->server->is_in_maint())
|
|
{
|
|
pMs->server->status = pMs->pending_status;
|
|
}
|
|
}
|
|
}
|
|
|
|
void MonitorWorkerSimple::pre_loop()
|
|
{
|
|
m_master = nullptr;
|
|
load_server_journal(&m_master);
|
|
// Add another overridable function for derived classes (e.g. pre_loop_monsimple) if required.
|
|
}
|
|
|
|
void MonitorWorkerSimple::post_loop()
|
|
{
|
|
}
|
|
|
|
void MonitorWorkerSimple::pre_tick()
|
|
{
|
|
}
|
|
|
|
void MonitorWorkerSimple::post_tick()
|
|
{
|
|
}
|
|
|
|
void MonitorWorkerSimple::tick()
|
|
{
|
|
check_maintenance_requests();
|
|
pre_tick();
|
|
|
|
const bool should_update_disk_space = check_disk_space_this_tick();
|
|
|
|
for (MonitorServer* pMs : servers())
|
|
{
|
|
if (!pMs->server->is_in_maint())
|
|
{
|
|
pMs->mon_prev_status = pMs->server->status;
|
|
pMs->pending_status = pMs->server->status;
|
|
|
|
ConnectResult rval = pMs->ping_or_connect(settings().conn_settings);
|
|
|
|
if (connection_is_ok(rval))
|
|
{
|
|
pMs->clear_pending_status(SERVER_AUTH_ERROR);
|
|
pMs->set_pending_status(SERVER_RUNNING);
|
|
|
|
if (should_update_disk_space && pMs->can_update_disk_space_status())
|
|
{
|
|
pMs->update_disk_space_status();
|
|
}
|
|
|
|
update_server_status(pMs);
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* TODO: Move the bits that do not represent a state out of
|
|
* the server state bits. This would allow clearing the state by
|
|
* zeroing it out.
|
|
*/
|
|
const uint64_t bits_to_clear = ~SERVER_WAS_MASTER;
|
|
|
|
pMs->clear_pending_status(bits_to_clear);
|
|
|
|
if (mysql_errno(pMs->con) == ER_ACCESS_DENIED_ERROR)
|
|
{
|
|
pMs->set_pending_status(SERVER_AUTH_ERROR);
|
|
}
|
|
else
|
|
{
|
|
pMs->clear_pending_status(SERVER_AUTH_ERROR);
|
|
}
|
|
|
|
if (pMs->status_changed() && pMs->should_print_fail_status())
|
|
{
|
|
pMs->log_connect_error(rval);
|
|
}
|
|
}
|
|
|
|
#if defined (SS_DEBUG)
|
|
if (pMs->status_changed() || pMs->should_print_fail_status())
|
|
{
|
|
// The current status is still in pMs->pending_status.
|
|
MXS_DEBUG("Backend server [%s]:%d state : %s",
|
|
pMs->server->address, pMs->server->port,
|
|
SERVER::status_to_string(pMs->pending_status).c_str());
|
|
}
|
|
#endif
|
|
|
|
if (pMs->server->is_down())
|
|
{
|
|
pMs->mon_err_count += 1;
|
|
}
|
|
else
|
|
{
|
|
pMs->mon_err_count = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
post_tick();
|
|
|
|
flush_server_status();
|
|
process_state_changes();
|
|
hangup_failed_servers();
|
|
store_server_journal(m_master);
|
|
}
|
|
|
|
void MonitorWorker::pre_loop()
|
|
{
|
|
}
|
|
|
|
void MonitorWorker::post_loop()
|
|
{
|
|
}
|
|
|
|
void MonitorWorker::process_state_changes()
|
|
{
|
|
detect_handle_state_changes();
|
|
}
|
|
|
|
bool MonitorWorker::pre_run()
|
|
{
|
|
bool rv = false;
|
|
|
|
if (mysql_thread_init() == 0)
|
|
{
|
|
rv = true;
|
|
// Write and post the semaphore to signal the admin thread that the start is succeeding.
|
|
m_thread_running.store(true, std::memory_order_release);
|
|
m_semaphore.post();
|
|
|
|
pre_loop();
|
|
delayed_call(1, &MonitorWorker::call_run_one_tick, this);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("mysql_thread_init() failed for %s. The monitor cannot start.", name());
|
|
m_semaphore.post();
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
void MonitorWorker::post_run()
|
|
{
|
|
post_loop();
|
|
|
|
mysql_thread_end();
|
|
}
|
|
|
|
bool MonitorWorker::call_run_one_tick(Worker::Call::action_t action)
|
|
{
|
|
/** This is both the minimum sleep between two ticks and also the maximum time between early
|
|
* wakeup checks. */
|
|
const int base_interval_ms = 100;
|
|
if (action == Worker::Call::EXECUTE)
|
|
{
|
|
int64_t now = get_time_ms();
|
|
// Enough time has passed,
|
|
if ((now - m_loop_called > settings().interval)
|
|
// or a server status change request is waiting,
|
|
|| server_status_request_waiting()
|
|
// or a monitor-specific condition is met.
|
|
|| immediate_tick_required())
|
|
{
|
|
m_loop_called = now;
|
|
run_one_tick();
|
|
now = get_time_ms();
|
|
}
|
|
|
|
int64_t ms_to_next_call = settings().interval - (now - m_loop_called);
|
|
// ms_to_next_call will be negative, if the run_one_tick() call took
|
|
// longer than one monitor interval.
|
|
int64_t delay = ((ms_to_next_call <= 0) || (ms_to_next_call >= base_interval_ms)) ?
|
|
base_interval_ms : ms_to_next_call;
|
|
|
|
delayed_call(delay, &MonitorWorker::call_run_one_tick, this);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void MonitorWorker::run_one_tick()
|
|
{
|
|
tick();
|
|
m_ticks.fetch_add(1, std::memory_order_acq_rel);
|
|
}
|
|
|
|
bool MonitorWorker::immediate_tick_required() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
MonitorServer::MonitorServer(SERVER* server, const SERVER::DiskSpaceLimits& monitor_limits)
|
|
: server(server)
|
|
, monitor_limits(monitor_limits)
|
|
{
|
|
}
|
|
|
|
MonitorServer::~MonitorServer()
|
|
{
|
|
if (con)
|
|
{
|
|
mysql_close(con);
|
|
}
|
|
}
|
|
}
|