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MaxScale/server/core/monitor.c
Johan Wikman d7f79942be Merge branch '2.0' into develop
2016-09-09 15:12:58 +03:00

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/*
* Copyright (c) 2016 MariaDB Corporation Ab
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file and at www.mariadb.com/bsl.
*
* Change Date: 2019-07-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2 or later of the General
* Public License.
*/
/**
* @file monitor.c - The monitor module management routines
*
* @verbatim
* Revision History
*
* Date Who Description
* 08/07/13 Mark Riddoch Initial implementation
* 23/05/14 Massimiliano Pinto Addition of monitor_interval parameter
* and monitor id
* 30/10/14 Massimiliano Pinto Addition of disable_master_failback parameter
* 07/11/14 Massimiliano Pinto Addition of monitor network timeouts
* 08/05/15 Markus Makela Moved common monitor variables to MONITOR struct
*
* @endverbatim
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <monitor.h>
#include <spinlock.h>
#include <modules.h>
#include <skygw_utils.h>
#include <log_manager.h>
#include <secrets.h>
#include <maxscale_pcre2.h>
#include <externcmd.h>
#include <mysqld_error.h>
#include <mysql_utils.h>
#include <maxscale/alloc.h>
/*
* Create declarations of the enum for monitor events and also the array of
* structs containing the matching names. The data is taken from def_monitor_event.h
*
*/
#undef ADDITEM
#define ADDITEM( _event_type, _event_name ) { #_event_name }
const monitor_def_t monitor_event_definitions[MAX_MONITOR_EVENT] =
{
#include "def_monitor_event.h"
};
#undef ADDITEM
static MONITOR *allMonitors = NULL;
static SPINLOCK monLock = SPINLOCK_INIT;
static void monitor_servers_free(MONITOR_SERVERS *servers);
/**
* Allocate a new monitor, load the associated module for the monitor
* and start execution on the monitor.
*
* @param name The name of the monitor module to load
* @param module The module to load
* @return The newly created monitor
*/
MONITOR *
monitor_alloc(char *name, char *module)
{
name = MXS_STRDUP(name);
MONITOR *mon = (MONITOR *)MXS_MALLOC(sizeof(MONITOR));
if (!name || !mon)
{
MXS_FREE(name);
MXS_FREE(mon);
return NULL;
}
if ((mon->module = load_module(module, MODULE_MONITOR)) == NULL)
{
MXS_ERROR("Unable to load monitor module '%s'.", name);
MXS_FREE(name);
MXS_FREE(mon);
return NULL;
}
mon->state = MONITOR_STATE_ALLOC;
mon->name = name;
mon->handle = NULL;
mon->databases = NULL;
mon->password = NULL;
mon->user = NULL;
mon->password = NULL;
mon->read_timeout = DEFAULT_READ_TIMEOUT;
mon->write_timeout = DEFAULT_WRITE_TIMEOUT;
mon->connect_timeout = DEFAULT_CONNECT_TIMEOUT;
mon->interval = MONITOR_INTERVAL;
mon->parameters = NULL;
spinlock_init(&mon->lock);
spinlock_acquire(&monLock);
mon->next = allMonitors;
allMonitors = mon;
spinlock_release(&monLock);
return mon;
}
/**
* Free a monitor, first stop the monitor and then remove the monitor from
* the chain of monitors and free the memory.
*
* @param mon The monitor to free
*/
void
monitor_free(MONITOR *mon)
{
MONITOR *ptr;
mon->module->stopMonitor(mon);
mon->state = MONITOR_STATE_FREED;
spinlock_acquire(&monLock);
if (allMonitors == mon)
{
allMonitors = mon->next;
}
else
{
ptr = allMonitors;
while (ptr->next && ptr->next != mon)
{
ptr = ptr->next;
}
if (ptr->next)
{
ptr->next = mon->next;
}
}
spinlock_release(&monLock);
free_config_parameter(mon->parameters);
monitor_servers_free(mon->databases);
MXS_FREE(mon->name);
MXS_FREE(mon);
}
/**
* Start an individual monitor that has previously been stopped.
*
* @param monitor The Monitor that should be started
*/
void
monitorStart(MONITOR *monitor, void* params)
{
spinlock_acquire(&monitor->lock);
if ((monitor->handle = (*monitor->module->startMonitor)(monitor, params)))
{
monitor->state = MONITOR_STATE_RUNNING;
}
else
{
MXS_ERROR("Failed to start monitor '%s'.", monitor->name);
}
spinlock_release(&monitor->lock);
}
/**
* Start all monitors
*/
void monitorStartAll()
{
MONITOR *ptr;
spinlock_acquire(&monLock);
ptr = allMonitors;
while (ptr)
{
monitorStart(ptr, ptr->parameters);
ptr = ptr->next;
}
spinlock_release(&monLock);
}
/**
* Stop a given monitor
*
* @param monitor The monitor to stop
*/
void
monitorStop(MONITOR *monitor)
{
spinlock_acquire(&monitor->lock);
/** Only stop the monitor if it is running */
if (monitor->state == MONITOR_STATE_RUNNING)
{
monitor->state = MONITOR_STATE_STOPPING;
monitor->module->stopMonitor(monitor);
monitor->state = MONITOR_STATE_STOPPED;
MONITOR_SERVERS* db = monitor->databases;
while (db)
{
// TODO: Create a generic entry point for this or move it inside stopMonitor
mysql_close(db->con);
db->con = NULL;
db = db->next;
}
}
spinlock_release(&monitor->lock);
}
/**
* Shutdown all running monitors
*/
void
monitorStopAll()
{
MONITOR *ptr;
spinlock_acquire(&monLock);
ptr = allMonitors;
while (ptr)
{
monitorStop(ptr);
ptr = ptr->next;
}
spinlock_release(&monLock);
}
/**
* Add a server to a monitor. Simply register the server that needs to be
* monitored to the running monitor module.
*
* @param mon The Monitor instance
* @param server The Server to add to the monitoring
*/
void
monitorAddServer(MONITOR *mon, SERVER *server)
{
MONITOR_SERVERS *db = (MONITOR_SERVERS *)MXS_MALLOC(sizeof(MONITOR_SERVERS));
MXS_ABORT_IF_NULL(db);
db->server = server;
db->con = NULL;
db->next = NULL;
db->mon_err_count = 0;
db->log_version_err = true;
/** Server status is uninitialized */
db->mon_prev_status = -1;
/* pending status is updated by get_replication_tree */
db->pending_status = 0;
spinlock_acquire(&mon->lock);
if (mon->databases == NULL)
{
mon->databases = db;
}
else
{
MONITOR_SERVERS *ptr = mon->databases;
while (ptr->next != NULL)
{
ptr = ptr->next;
}
ptr->next = db;
}
spinlock_release(&mon->lock);
}
/**
* Free monitor server list
* @param servers Servers to free
*/
static void monitor_servers_free(MONITOR_SERVERS *servers)
{
while (servers)
{
MONITOR_SERVERS *tofree = servers;
servers = servers->next;
if (tofree->con)
{
mysql_close(tofree->con);
}
MXS_FREE(tofree);
}
}
/**
* Add a default user to the monitor. This user is used to connect to the
* monitored databases but may be overriden on a per server basis.
*
* @param mon The monitor instance
* @param user The default username to use when connecting
* @param passwd The default password associated to the default user.
*/
void
monitorAddUser(MONITOR *mon, char *user, char *passwd)
{
mon->user = MXS_STRDUP_A(user);
mon->password = MXS_STRDUP_A(passwd);
}
/**
* Show all monitors
*
* @param dcb DCB for printing output
*/
void
monitorShowAll(DCB *dcb)
{
MONITOR *ptr;
spinlock_acquire(&monLock);
ptr = allMonitors;
while (ptr)
{
monitorShow(dcb, ptr);
ptr = ptr->next;
}
spinlock_release(&monLock);
}
/**
* Show a single monitor
*
* @param dcb DCB for printing output
*/
void
monitorShow(DCB *dcb, MONITOR *monitor)
{
dcb_printf(dcb, "Monitor: %p\n", monitor);
dcb_printf(dcb, "\tName: %s\n", monitor->name);
if (monitor->handle)
{
if (monitor->module->diagnostics)
{
monitor->module->diagnostics(dcb, monitor);
}
else
{
dcb_printf(dcb, "\t(no diagnostics)\n");
}
}
else
{
dcb_printf(dcb, "\tMonitor failed\n");
}
}
/**
* List all the monitors
*
* @param dcb DCB for printing output
*/
void
monitorList(DCB *dcb)
{
MONITOR *ptr;
spinlock_acquire(&monLock);
ptr = allMonitors;
dcb_printf(dcb, "---------------------+---------------------\n");
dcb_printf(dcb, "%-20s | Status\n", "Monitor");
dcb_printf(dcb, "---------------------+---------------------\n");
while (ptr)
{
dcb_printf(dcb, "%-20s | %s\n", ptr->name,
ptr->state & MONITOR_STATE_RUNNING
? "Running" : "Stopped");
ptr = ptr->next;
}
dcb_printf(dcb, "---------------------+---------------------\n");
spinlock_release(&monLock);
}
/**
* Find a monitor by name
*
* @param name The name of the monitor
* @return Pointer to the monitor or NULL
*/
MONITOR *
monitor_find(char *name)
{
MONITOR *ptr;
spinlock_acquire(&monLock);
ptr = allMonitors;
while (ptr)
{
if (!strcmp(ptr->name, name))
{
break;
}
ptr = ptr->next;
}
spinlock_release(&monLock);
return ptr;
}
/**
* Set the monitor sampling interval.
*
* @param mon The monitor instance
* @param interval The sampling interval in milliseconds
*/
void
monitorSetInterval(MONITOR *mon, unsigned long interval)
{
mon->interval = interval;
}
/**
* Set Monitor timeouts for connect/read/write
*
* @param mon The monitor instance
* @param type The timeout handling type
* @param value The timeout to set
*/
bool
monitorSetNetworkTimeout(MONITOR *mon, int type, int value)
{
bool rval = true;
if (value > 0)
{
switch (type)
{
case MONITOR_CONNECT_TIMEOUT:
mon->connect_timeout = value;
break;
case MONITOR_READ_TIMEOUT:
mon->read_timeout = value;
break;
case MONITOR_WRITE_TIMEOUT:
mon->write_timeout = value;
break;
default:
MXS_ERROR("Monitor setNetworkTimeout received an unsupported action type %i", type);
rval = false;
break;
}
}
else
{
MXS_ERROR("Negative value for monitor timeout.");
rval = false;
}
return rval;
}
/**
* Provide a row to the result set that defines the set of monitors
*
* @param set The result set
* @param data The index of the row to send
* @return The next row or NULL
*/
static RESULT_ROW *
monitorRowCallback(RESULTSET *set, void *data)
{
int *rowno = (int *)data;
int i = 0;;
char buf[20];
RESULT_ROW *row;
MONITOR *ptr;
spinlock_acquire(&monLock);
ptr = allMonitors;
while (i < *rowno && ptr)
{
i++;
ptr = ptr->next;
}
if (ptr == NULL)
{
spinlock_release(&monLock);
MXS_FREE(data);
return NULL;
}
(*rowno)++;
row = resultset_make_row(set);
resultset_row_set(row, 0, ptr->name);
resultset_row_set(row, 1, ptr->state & MONITOR_STATE_RUNNING
? "Running" : "Stopped");
spinlock_release(&monLock);
return row;
}
/**
* Return a resultset that has the current set of monitors in it
*
* @return A Result set
*/
RESULTSET *
monitorGetList()
{
RESULTSET *set;
int *data;
if ((data = (int *)MXS_MALLOC(sizeof(int))) == NULL)
{
return NULL;
}
*data = 0;
if ((set = resultset_create(monitorRowCallback, data)) == NULL)
{
MXS_FREE(data);
return NULL;
}
resultset_add_column(set, "Monitor", 20, COL_TYPE_VARCHAR);
resultset_add_column(set, "Status", 10, COL_TYPE_VARCHAR);
return set;
}
/**
* @brief Check if the monitor user has all required permissions to operate properly.
*
* @param service Monitor to inspect
* @param query Query to execute
* @return True on success, false if monitor credentials lack permissions
*/
bool check_monitor_permissions(MONITOR* monitor, const char* query)
{
if (monitor->databases == NULL)
{
MXS_ERROR("[%s] Monitor is missing the servers parameter.", monitor->name);
return false;
}
char *user = monitor->user;
char *dpasswd = decryptPassword(monitor->password);
GATEWAY_CONF* cnf = config_get_global_options();
bool rval = false;
for (MONITOR_SERVERS *mondb = monitor->databases; mondb; mondb = mondb->next)
{
MYSQL *mysql = mysql_init(NULL);
if (mysql == NULL)
{
MXS_ERROR("[%s] Error: MySQL connection initialization failed.", __FUNCTION__);
break;
}
mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, &cnf->auth_read_timeout);
mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, &cnf->auth_conn_timeout);
mysql_options(mysql, MYSQL_OPT_WRITE_TIMEOUT, &cnf->auth_write_timeout);
if (mxs_mysql_real_connect(mysql, mondb->server, user, dpasswd) == NULL)
{
MXS_ERROR("[%s] Failed to connect to server '%s' (%s:%d) when"
" checking monitor user credentials and permissions: %s",
monitor->name, mondb->server->unique_name, mondb->server->name,
mondb->server->port, mysql_error(mysql));
switch (mysql_errno(mysql))
{
case ER_ACCESS_DENIED_ERROR:
case ER_DBACCESS_DENIED_ERROR:
case ER_ACCESS_DENIED_NO_PASSWORD_ERROR:
break;
default:
rval = true;
break;
}
}
else if (mysql_query(mysql, query) != 0)
{
switch (mysql_errno(mysql))
{
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",
monitor->name, query, user, mysql_error(mysql));
}
else
{
rval = true;
MYSQL_RES *res = mysql_use_result(mysql);
if (res == NULL)
{
MXS_ERROR("[%s] Result retrieval failed when checking monitor permissions: %s",
monitor->name, mysql_error(mysql));
}
else
{
mysql_free_result(res);
}
}
mysql_close(mysql);
}
MXS_FREE(dpasswd);
return rval;
}
/**
* Add parameters to the monitor
* @param monitor Monitor
* @param params Config parameters
*/
void monitorAddParameters(MONITOR *monitor, CONFIG_PARAMETER *params)
{
while (params)
{
CONFIG_PARAMETER* clone = config_clone_param(params);
if (clone)
{
clone->next = monitor->parameters;
monitor->parameters = clone;
}
params = params->next;
}
}
/**
* Set a pending status bit in the monitor server
*
* @param server The server to update
* @param bit The bit to clear for the server
*/
void
monitor_set_pending_status(MONITOR_SERVERS *ptr, int bit)
{
ptr->pending_status |= bit;
}
/**
* Clear a pending status bit in the monitor server
*
* @param server The server to update
* @param bit The bit to clear for the server
*/
void
monitor_clear_pending_status(MONITOR_SERVERS *ptr, int bit)
{
ptr->pending_status &= ~bit;
}
/*
* Determine a monitor event, defined by the difference between the old
* status of a server and the new status.
*
* @param node The monitor server data for a particular server
* @result monitor_event_t A monitor event (enum)
*/
monitor_event_t
mon_get_event_type(MONITOR_SERVERS* node)
{
typedef enum
{
DOWN_EVENT,
UP_EVENT,
LOSS_EVENT,
NEW_EVENT,
UNSUPPORTED_EVENT
} general_event_type;
general_event_type event_type = UNSUPPORTED_EVENT;
unsigned int prev = node->mon_prev_status
& (SERVER_RUNNING | SERVER_MASTER | SERVER_SLAVE | SERVER_JOINED | SERVER_NDB);
unsigned int present = node->server->status
& (SERVER_RUNNING | SERVER_MASTER | SERVER_SLAVE | SERVER_JOINED | SERVER_NDB);
if (prev == present)
{
/* No change in the bits we're interested in */
return UNDEFINED_MONITOR_EVENT;
}
if ((prev & SERVER_RUNNING) == 0)
{
/* The server was not running previously */
if ((present & SERVER_RUNNING) != 0)
{
event_type = UP_EVENT;
}
/* Otherwise, was not running and still is not running */
/* - this is not a recognised event */
}
else
{
/* Previous state must have been running */
if ((present & SERVER_RUNNING) == 0)
{
event_type = DOWN_EVENT;
}
else
{
/* Was running and still is */
if (prev & (SERVER_MASTER | SERVER_SLAVE | SERVER_JOINED | SERVER_NDB))
{
/* 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;
}
}
}
switch (event_type)
{
case UP_EVENT:
return (present & SERVER_MASTER) ? MASTER_UP_EVENT :
(present & SERVER_SLAVE) ? SLAVE_UP_EVENT :
(present & SERVER_JOINED) ? SYNCED_UP_EVENT :
(present & SERVER_NDB) ? NDB_UP_EVENT :
SERVER_UP_EVENT;
case DOWN_EVENT:
return (prev & SERVER_MASTER) ? MASTER_DOWN_EVENT :
(prev & SERVER_SLAVE) ? SLAVE_DOWN_EVENT :
(prev & SERVER_JOINED) ? SYNCED_DOWN_EVENT :
(prev & SERVER_NDB) ? NDB_DOWN_EVENT :
SERVER_DOWN_EVENT;
case LOSS_EVENT:
return (prev & SERVER_MASTER) ? LOST_MASTER_EVENT :
(prev & SERVER_SLAVE) ? LOST_SLAVE_EVENT :
(prev & SERVER_JOINED) ? LOST_SYNCED_EVENT :
LOST_NDB_EVENT;
case NEW_EVENT:
return (present & SERVER_MASTER) ? NEW_MASTER_EVENT :
(present & SERVER_SLAVE) ? NEW_SLAVE_EVENT :
(present & SERVER_JOINED) ? NEW_SYNCED_EVENT :
NEW_NDB_EVENT;
default:
return UNDEFINED_MONITOR_EVENT;
}
}
/*
* Given a monitor event (enum) provide a text string equivalent
* @param node The monitor server data whose event is wanted
* @result string The name of the monitor event for the server
*/
const char*
mon_get_event_name(MONITOR_SERVERS* node)
{
return monitor_event_definitions[mon_get_event_type(node)].name;
}
/*
* Given the text version of a monitor event, determine the event (enum)
*
* @param event_name String containing the event name
* @result monitor_event_t Monitor event corresponding to name
*/
monitor_event_t
mon_name_to_event(const char *event_name)
{
monitor_event_t event;
for (event = 0; event < MAX_MONITOR_EVENT; event++)
{
if (0 == strcasecmp(monitor_event_definitions[event].name, event_name))
{
return event;
}
}
return UNDEFINED_MONITOR_EVENT;
}
/**
* Create a list of running servers
*
* @param servers Monitored servers
* @param dest Destination where the string is appended, must be null terminated
* @param len Length of @c dest
*/
static void mon_append_node_names(MONITOR_SERVERS* servers, char* dest, int len, int status)
{
char *separator = "";
char arr[MAX_SERVER_NAME_LEN + 32]; // Some extra space for port
dest[0] = '\0';
while (servers && strlen(dest) < (len - strlen(separator)))
{
if (status == 0 || servers->server->status & status)
{
strncat(dest, separator, len);
separator = ",";
snprintf(arr, sizeof(arr), "%s:%d", servers->server->name, servers->server->port);
strncat(dest, arr, len - strlen(dest) - 1);
}
servers = servers->next;
}
}
/**
* Check if current monitored server status has changed
*
* @param mon_srv The monitored server
* @return true if status has changed or false
*/
bool
mon_status_changed(MONITOR_SERVERS* mon_srv)
{
/* Previous status is -1 if not yet set */
return (mon_srv->mon_prev_status != -1
&& mon_srv->mon_prev_status != mon_srv->server->status
/** If the server is going into maintenance or coming out of it, don't trigger a state change */
&& ((mon_srv->mon_prev_status | mon_srv->server->status) & SERVER_MAINT) == 0);
}
/**
* Check if current monitored server has a loggable failure status
*
* @param mon_srv The monitored server
* @return true if failed status can be logged or false
*/
bool
mon_print_fail_status(MONITOR_SERVERS* mon_srv)
{
return (SERVER_IS_DOWN(mon_srv->server) && mon_srv->mon_err_count == 0);
}
/**
* Launch a script
* @param mon Owning monitor
* @param ptr The server which has changed state
* @param script Script to execute
*/
void
monitor_launch_script(MONITOR* mon, MONITOR_SERVERS* ptr, char* script)
{
EXTERNCMD* cmd = externcmd_allocate(script);
if (cmd == NULL)
{
MXS_ERROR("Failed to initialize script '%s'. See previous errors for the "
"cause of this failure.", script);
return;
}
if (externcmd_matches(cmd, "$INITIATOR"))
{
char initiator[strlen(ptr->server->name) + 24]; // Extra space for port
snprintf(initiator, sizeof(initiator), "%s:%d", ptr->server->name, ptr->server->port);
externcmd_substitute_arg(cmd, "[$]INITIATOR", initiator);
}
if (externcmd_matches(cmd, "$EVENT"))
{
externcmd_substitute_arg(cmd, "[$]EVENT", mon_get_event_name(ptr));
}
char nodelist[PATH_MAX + MON_ARG_MAX + 1] = {'\0'};
if (externcmd_matches(cmd, "$NODELIST"))
{
mon_append_node_names(mon->databases, nodelist, sizeof(nodelist), SERVER_RUNNING);
externcmd_substitute_arg(cmd, "[$]NODELIST", nodelist);
}
if (externcmd_matches(cmd, "$LIST"))
{
mon_append_node_names(mon->databases, nodelist, sizeof(nodelist), 0);
externcmd_substitute_arg(cmd, "[$]LIST", nodelist);
}
if (externcmd_matches(cmd, "$MASTERLIST"))
{
mon_append_node_names(mon->databases, nodelist, sizeof(nodelist), SERVER_MASTER);
externcmd_substitute_arg(cmd, "[$]MASTERLIST", nodelist);
}
if (externcmd_matches(cmd, "$SLAVELIST"))
{
mon_append_node_names(mon->databases, nodelist, sizeof(nodelist), SERVER_SLAVE);
externcmd_substitute_arg(cmd, "[$]SLAVELIST", nodelist);
}
if (externcmd_matches(cmd, "$SYNCEDLIST"))
{
mon_append_node_names(mon->databases, nodelist, sizeof(nodelist), SERVER_JOINED);
externcmd_substitute_arg(cmd, "[$]SYNCEDLIST", nodelist);
}
if (externcmd_execute(cmd))
{
MXS_ERROR("Failed to execute script '%s' on server state change event '%s'.",
script, mon_get_event_name(ptr));
}
else
{
MXS_NOTICE("Executed monitor script '%s' on event '%s'.",
script, mon_get_event_name(ptr));
}
externcmd_free(cmd);
}
/**
* Parse a string of event names to an array with enabled events.
* @param events Pointer to an array of boolean values
* @param count Size of the array
* @param string String to parse
* @return 0 on success. 1 when an error has occurred or an unexpected event was
* found.
*/
int
mon_parse_event_string(bool* events, size_t count, char* given_string)
{
char *tok, *saved, *string = MXS_STRDUP(given_string);
MXS_ABORT_IF_NULL(string);
monitor_event_t event;
tok = strtok_r(string, ",| ", &saved);
if (tok == NULL)
{
MXS_FREE(string);
return -1;
}
while (tok)
{
event = mon_name_to_event(tok);
if (event == UNDEFINED_MONITOR_EVENT)
{
MXS_ERROR("Invalid event name %s", tok);
MXS_FREE(string);
return -1;
}
if (event < count)
{
events[event] = true;
tok = strtok_r(NULL, ",| ", &saved);
}
}
MXS_FREE(string);
return 0;
}
/**
* Connect to a database. This will always leave a valid database handle in the
* database->con pointer. This allows the user to call MySQL C API functions to
* find out the reason of the failure.
* @param mon Monitor
* @param database Monitored database
* @return MONITOR_CONN_OK if the connection is OK else the reason for the failure
*/
connect_result_t
mon_connect_to_db(MONITOR* mon, MONITOR_SERVERS *database)
{
connect_result_t rval = MONITOR_CONN_OK;
/** Return if the connection is OK */
if (database->con && mysql_ping(database->con) == 0)
{
return rval;
}
if (database->con)
{
mysql_close(database->con);
}
if ((database->con = mysql_init(NULL)))
{
char *uname = database->server->monuser ? database->server->monuser : mon->user;
char *passwd = database->server->monpw ? database->server->monpw : mon->password;
char *dpwd = decryptPassword(passwd);
mysql_options(database->con, MYSQL_OPT_CONNECT_TIMEOUT, (void *) &mon->connect_timeout);
mysql_options(database->con, MYSQL_OPT_READ_TIMEOUT, (void *) &mon->read_timeout);
mysql_options(database->con, MYSQL_OPT_WRITE_TIMEOUT, (void *) &mon->write_timeout);
time_t start = time(NULL);
bool result = (mxs_mysql_real_connect(database->con, database->server, uname, dpwd) != NULL);
time_t end = time(NULL);
if (!result)
{
if ((int) difftime(end, start) >= mon->connect_timeout)
{
rval = MONITOR_CONN_TIMEOUT;
}
else
{
rval = MONITOR_CONN_REFUSED;
}
}
MXS_FREE(dpwd);
}
else
{
rval = MONITOR_CONN_REFUSED;
}
return rval;
}
/**
* Log an error about the failure to connect to a backend server
* and why it happened.
* @param database Backend database
* @param rval Return value of mon_connect_to_db
*/
void
mon_log_connect_error(MONITOR_SERVERS* database, connect_result_t rval)
{
MXS_ERROR(rval == MONITOR_CONN_TIMEOUT ?
"Monitor timed out when connecting to "
"server %s:%d : \"%s\"" :
"Monitor was unable to connect to "
"server %s:%d : \"%s\"",
database->server->name,
database->server->port,
mysql_error(database->con));
}
void mon_log_state_change(MONITOR_SERVERS *ptr)
{
SERVER srv;
srv.status = ptr->mon_prev_status;
char *prev = server_status(&srv);
char *next = server_status(ptr->server);
MXS_NOTICE("Server changed state: %s[%s:%u]: %s. [%s] -> [%s]",
ptr->server->unique_name, ptr->server->name, ptr->server->port,
mon_get_event_name(ptr), prev, next);
MXS_FREE(prev);
MXS_FREE(next);
}
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