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MaxScale/server/core/server.cc
Markus Mäkelä a7dd2127d6 Merge branch '2.1' into 2.2
2018-06-08 11:21:35 +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/bsl11.
*
* Change Date: 2020-01-01
*
* 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 server.c - A representation of a backend server within the gateway.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string>
#include <maxscale/config.h>
#include <maxscale/service.h>
#include <maxscale/session.h>
#include <maxscale/server.h>
#include <maxscale/spinlock.h>
#include <maxscale/dcb.h>
#include <maxscale/poll.h>
#include <maxscale/log_manager.h>
#include <maxscale/ssl.h>
#include <maxscale/alloc.h>
#include <maxscale/paths.h>
#include <maxscale/utils.h>
#include <maxscale/semaphore.hh>
#include <maxscale/json_api.h>
#include <maxscale/hk_heartbeat.h>
#include <maxscale/http.hh>
#include <maxscale/maxscale.h>
#include "internal/monitor.h"
#include "internal/poll.h"
#include "internal/workertask.hh"
#include "internal/worker.hh"
using maxscale::Semaphore;
using maxscale::Worker;
using maxscale::WorkerTask;
using std::string;
/** The latin1 charset */
#define SERVER_DEFAULT_CHARSET 0x08
const char CN_MONITORPW[] = "monitorpw";
const char CN_MONITORUSER[] = "monitoruser";
const char CN_PERSISTMAXTIME[] = "persistmaxtime";
const char CN_PERSISTPOOLMAX[] = "persistpoolmax";
const char CN_PROXY_PROTOCOL[] = "proxy_protocol";
static SPINLOCK server_spin = SPINLOCK_INIT;
static SERVER *allServers = NULL;
static void spin_reporter(void *, char *, int);
static void server_parameter_free(SERVER_PARAM *tofree);
SERVER* server_alloc(const char *name, const char *address, unsigned short port,
const char *protocol, const char *authenticator, const char *auth_options)
{
if (authenticator == NULL && (authenticator = get_default_authenticator(protocol)) == NULL)
{
MXS_ERROR("No authenticator defined for server '%s' and no default "
"authenticator for protocol '%s'.", name, protocol);
return NULL;
}
void *auth_instance = NULL;
if (!authenticator_init(&auth_instance, authenticator, auth_options))
{
MXS_ERROR("Failed to initialize authenticator module '%s' for server '%s' ",
authenticator, name);
return NULL;
}
char *my_auth_options = NULL;
if (auth_options && (my_auth_options = MXS_STRDUP(auth_options)) == NULL)
{
return NULL;
}
int nthr = config_threadcount();
SERVER *server = (SERVER *)MXS_CALLOC(1, sizeof(SERVER));
char *my_name = MXS_STRDUP(name);
char *my_protocol = MXS_STRDUP(protocol);
char *my_authenticator = MXS_STRDUP(authenticator);
DCB **persistent = (DCB**)MXS_CALLOC(nthr, sizeof(*persistent));
if (!server || !my_name || !my_protocol || !my_authenticator || !persistent)
{
MXS_FREE(server);
MXS_FREE(my_name);
MXS_FREE(persistent);
MXS_FREE(my_protocol);
MXS_FREE(my_authenticator);
return NULL;
}
if (snprintf(server->name, sizeof(server->name), "%s", address) > (int)sizeof(server->name))
{
MXS_WARNING("Truncated server address '%s' to the maximum size of %lu characters.",
address, sizeof(server->name));
}
#if defined(SS_DEBUG)
server->server_chk_top = CHK_NUM_SERVER;
server->server_chk_tail = CHK_NUM_SERVER;
#endif
server->unique_name = my_name;
server->protocol = my_protocol;
server->authenticator = my_authenticator;
server->auth_instance = auth_instance;
server->auth_options = my_auth_options;
server->port = port;
server->status = SERVER_RUNNING;
server->status_pending = SERVER_RUNNING;
server->node_id = -1;
server->rlag = MAX_RLAG_UNDEFINED;
server->master_id = -1;
server->depth = -1;
server->parameters = NULL;
spinlock_init(&server->lock);
server->persistent = persistent;
server->persistmax = 0;
server->persistmaxtime = 0;
server->persistpoolmax = 0;
server->monuser[0] = '\0';
server->monpw[0] = '\0';
server->is_active = true;
server->charset = SERVER_DEFAULT_CHARSET;
server->proxy_protocol = false;
// Set last event to server_up as the server is in Running state on startup
server->last_event = SERVER_UP_EVENT;
server->triggered_at = 0;
// Log all warnings once
memset(&server->log_warning, 1, sizeof(server->log_warning));
spinlock_acquire(&server_spin);
server->next = allServers;
allServers = server;
spinlock_release(&server_spin);
return server;
}
/**
* Deallocate the specified server
*
* @param server The service to deallocate
* @return Returns true if the server was freed
*/
int
server_free(SERVER *tofreeserver)
{
SERVER *server;
/* First of all remove from the linked list */
spinlock_acquire(&server_spin);
if (allServers == tofreeserver)
{
allServers = tofreeserver->next;
}
else
{
server = allServers;
while (server && server->next != tofreeserver)
{
server = server->next;
}
if (server)
{
server->next = tofreeserver->next;
}
}
spinlock_release(&server_spin);
/* Clean up session and free the memory */
MXS_FREE(tofreeserver->protocol);
MXS_FREE(tofreeserver->unique_name);
MXS_FREE(tofreeserver->authenticator);
server_parameter_free(tofreeserver->parameters);
if (tofreeserver->persistent)
{
int nthr = config_threadcount();
for (int i = 0; i < nthr; i++)
{
dcb_persistent_clean_count(tofreeserver->persistent[i], i, true);
}
MXS_FREE(tofreeserver->persistent);
}
MXS_FREE(tofreeserver);
return 1;
}
/**
* Get a DCB from the persistent connection pool, if possible
*
* @param server The server to set the name on
* @param user The name of the user needing the connection
* @param ip Client IP address
* @param protocol The name of the protocol needed for the connection
* @param id Thread ID
*
* @return A DCB or NULL if no connection is found
*/
DCB* server_get_persistent(SERVER *server, const char *user, const char* ip, const char *protocol, int id)
{
DCB *dcb, *previous = NULL;
if (server->persistent[id]
&& dcb_persistent_clean_count(server->persistent[id], id, false)
&& server->persistent[id] // Check after cleaning
&& (server->status & SERVER_RUNNING))
{
dcb = server->persistent[id];
while (dcb)
{
if (dcb->user
&& dcb->protoname
&& dcb->remote
&& ip
&& !dcb-> dcb_errhandle_called
&& !(dcb->flags & DCBF_HUNG)
&& 0 == strcmp(dcb->user, user)
&& 0 == strcmp(dcb->remote, ip)
&& 0 == strcmp(dcb->protoname, protocol))
{
if (NULL == previous)
{
server->persistent[id] = dcb->nextpersistent;
}
else
{
previous->nextpersistent = dcb->nextpersistent;
}
MXS_FREE(dcb->user);
dcb->user = NULL;
atomic_add(&server->stats.n_persistent, -1);
atomic_add(&server->stats.n_current, 1);
return dcb;
}
else
{
MXS_DEBUG("%lu [server_get_persistent] Rejected dcb "
"%p from pool, user %s looking for %s, protocol %s "
"looking for %s, hung flag %s, error handle called %s.",
pthread_self(),
dcb,
dcb->user ? dcb->user : "NULL",
user,
dcb->protoname ? dcb->protoname : "NULL",
protocol,
(dcb->flags & DCBF_HUNG) ? "true" : "false",
dcb-> dcb_errhandle_called ? "true" : "false");
}
previous = dcb;
dcb = dcb->nextpersistent;
}
}
return NULL;
}
static inline SERVER* next_active_server(SERVER *server)
{
while (server && !server->is_active)
{
server = server->next;
}
return server;
}
/**
* @brief Find a server with the specified name
*
* @param name Name of the server
* @return The server or NULL if not found
*/
SERVER * server_find_by_unique_name(const char *name)
{
spinlock_acquire(&server_spin);
SERVER *server = next_active_server(allServers);
while (server)
{
if (server->unique_name && strcmp(server->unique_name, name) == 0)
{
break;
}
server = next_active_server(server->next);
}
spinlock_release(&server_spin);
return server;
}
/**
* Find several servers with the names specified in an array with a given size.
* The returned array (but not the elements) should be freed by the caller.
* If no valid server names were found or in case of error, nothing is written
* to the output parameter.
*
* @param servers An array of server names
* @param size Number of elements in the input server names array, equal to output
* size if any servers are found.
* @param output Where to save the output. Contains null elements for invalid server
* names. If all were invalid, the output is left untouched.
* @return Number of valid server names found
*/
int server_find_by_unique_names(char **server_names, int size, SERVER*** output)
{
ss_dassert(server_names && (size > 0));
SERVER **results = (SERVER**)MXS_CALLOC(size, sizeof(SERVER*));
if (!results)
{
return 0;
}
int found = 0;
for (int i = 0; i < size; i++)
{
results[i] = server_find_by_unique_name(server_names[i]);
found += (results[i]) ? 1 : 0;
}
if (found)
{
*output = results;
}
else
{
MXS_FREE(results);
}
return found;
}
/**
* Find an existing server
*
* @param servname The Server name or address
* @param port The server port
* @return The server or NULL if not found
*/
SERVER *
server_find(const char *servname, unsigned short port)
{
spinlock_acquire(&server_spin);
SERVER *server = next_active_server(allServers);
while (server)
{
if (strcmp(server->name, servname) == 0 && server->port == port)
{
break;
}
server = next_active_server(server->next);
}
spinlock_release(&server_spin);
return server;
}
/**
* Print details of an individual server
*
* @param server Server to print
*/
void
printServer(const SERVER *server)
{
printf("Server %p\n", server);
printf("\tServer: %s\n", server->name);
printf("\tProtocol: %s\n", server->protocol);
printf("\tPort: %d\n", server->port);
printf("\tTotal connections: %d\n", server->stats.n_connections);
printf("\tCurrent connections: %d\n", server->stats.n_current);
printf("\tPersistent connections: %d\n", server->stats.n_persistent);
printf("\tPersistent actual max: %d\n", server->persistmax);
}
/**
* Print all servers
*
* Designed to be called within a debugger session in order
* to display all active servers within the gateway
*/
void
printAllServers()
{
spinlock_acquire(&server_spin);
SERVER *server = next_active_server(allServers);
while (server)
{
printServer(server);
server = next_active_server(server->next);
}
spinlock_release(&server_spin);
}
/**
* Print all servers to a DCB
*
* Designed to be called within a debugger session in order
* to display all active servers within the gateway
*/
void
dprintAllServers(DCB *dcb)
{
spinlock_acquire(&server_spin);
SERVER *server = next_active_server(allServers);
while (server)
{
dprintServer(dcb, server);
server = next_active_server(server->next);
}
spinlock_release(&server_spin);
}
/**
* Print all servers in Json format to a DCB
*/
void
dprintAllServersJson(DCB *dcb)
{
json_t* all_servers = server_list_to_json("");
char* dump = json_dumps(all_servers, JSON_INDENT(4));
dcb_printf(dcb, "%s", dump);
MXS_FREE(dump);
json_decref(all_servers);
}
/**
* A class for cleaning up persistent connections
*/
class CleanupTask : public WorkerTask
{
public:
CleanupTask(const SERVER* server):
m_server(server)
{
}
void execute(Worker& worker)
{
int thread_id = worker.get_current_id();
dcb_persistent_clean_count(m_server->persistent[thread_id], thread_id, false);
}
private:
const SERVER* m_server; /**< Server to clean up */
};
/**
* @brief Clean up any stale persistent connections
*
* This function purges any stale persistent connections from @c server.
*
* @param server Server to clean up
*/
static void cleanup_persistent_connections(const SERVER* server)
{
CleanupTask task(server);
Worker::execute_concurrently(task);
}
/**
* Print server details to a DCB
*
* Designed to be called within a debugger session in order
* to display all active servers within the gateway
*/
void
dprintServer(DCB *dcb, const SERVER *server)
{
if (!SERVER_IS_ACTIVE(server))
{
return;
}
dcb_printf(dcb, "Server %p (%s)\n", server, server->unique_name);
dcb_printf(dcb, "\tServer: %s\n", server->name);
char* stat = server_status(server);
dcb_printf(dcb, "\tStatus: %s\n", stat);
MXS_FREE(stat);
dcb_printf(dcb, "\tProtocol: %s\n", server->protocol);
dcb_printf(dcb, "\tPort: %d\n", server->port);
dcb_printf(dcb, "\tServer Version: %s\n", server->version_string);
dcb_printf(dcb, "\tNode Id: %ld\n", server->node_id);
dcb_printf(dcb, "\tMaster Id: %ld\n", server->master_id);
dcb_printf(dcb, "\tLast event: %s\n",
mon_get_event_name((mxs_monitor_event_t)server->last_event));
time_t t = maxscale_started() + HB_TO_SEC(server->triggered_at);
dcb_printf(dcb, "\tTriggered at: %s\n", http_to_date(t).c_str());
if (server->slaves)
{
int i;
dcb_printf(dcb, "\tSlave Ids: ");
for (i = 0; server->slaves[i]; i++)
{
if (i == 0)
{
dcb_printf(dcb, "%li", server->slaves[i]);
}
else
{
dcb_printf(dcb, ", %li ", server->slaves[i]);
}
}
dcb_printf(dcb, "\n");
}
dcb_printf(dcb, "\tRepl Depth: %d\n", server->depth);
if (SERVER_IS_SLAVE(server) || SERVER_IS_RELAY_SERVER(server))
{
if (server->rlag >= 0)
{
dcb_printf(dcb, "\tSlave delay: %d\n", server->rlag);
}
}
if (server->node_ts > 0)
{
struct tm result;
char buf[40];
dcb_printf(dcb, "\tLast Repl Heartbeat: %s",
asctime_r(localtime_r((time_t *)(&server->node_ts), &result), buf));
}
SERVER_PARAM *param;
if ((param = server->parameters))
{
dcb_printf(dcb, "\tServer Parameters:\n");
while (param)
{
if (param->active)
{
dcb_printf(dcb, "\t %s\t%s\n",
param->name, param->value);
}
param = param->next;
}
}
dcb_printf(dcb, "\tNumber of connections: %d\n", server->stats.n_connections);
dcb_printf(dcb, "\tCurrent no. of conns: %d\n", server->stats.n_current);
dcb_printf(dcb, "\tCurrent no. of operations: %d\n", server->stats.n_current_ops);
dcb_printf(dcb, "\tNumber of routed packets: %lu\n", server->stats.packets);
if (server->persistpoolmax)
{
dcb_printf(dcb, "\tPersistent pool size: %d\n", server->stats.n_persistent);
cleanup_persistent_connections(server);
dcb_printf(dcb, "\tPersistent measured pool size: %d\n", server->stats.n_persistent);
dcb_printf(dcb, "\tPersistent actual size max: %d\n", server->persistmax);
dcb_printf(dcb, "\tPersistent pool size limit: %ld\n", server->persistpoolmax);
dcb_printf(dcb, "\tPersistent max time (secs): %ld\n", server->persistmaxtime);
dcb_printf(dcb, "\tConnections taken from pool: %lu\n", server->stats.n_from_pool);
double d = (double)server->stats.n_from_pool / (double)(server->stats.n_connections +
server->stats.n_from_pool + 1);
dcb_printf(dcb, "\tPool availability: %0.2lf%%\n", d * 100.0);
}
if (server->server_ssl)
{
SSL_LISTENER *l = server->server_ssl;
dcb_printf(dcb, "\tSSL initialized: %s\n",
l->ssl_init_done ? "yes" : "no");
dcb_printf(dcb, "\tSSL method type: %s\n",
ssl_method_type_to_string(l->ssl_method_type));
dcb_printf(dcb, "\tSSL certificate verification depth: %d\n", l->ssl_cert_verify_depth);
dcb_printf(dcb, "\tSSL peer verification : %s\n", l->ssl_verify_peer_certificate ? "true" : "false");
dcb_printf(dcb, "\tSSL certificate: %s\n",
l->ssl_cert ? l->ssl_cert : "null");
dcb_printf(dcb, "\tSSL key: %s\n",
l->ssl_key ? l->ssl_key : "null");
dcb_printf(dcb, "\tSSL CA certificate: %s\n",
l->ssl_ca_cert ? l->ssl_ca_cert : "null");
}
if (server->proxy_protocol)
{
dcb_printf(dcb, "\tPROXY protocol: on.\n");
}
}
/**
* Display an entry from the spinlock statistics data
*
* @param dcb The DCB to print to
* @param desc Description of the statistic
* @param value The statistic value
*/
static void
spin_reporter(void *dcb, char *desc, int value)
{
dcb_printf((DCB *)dcb, "\t\t%-40s %d\n", desc, value);
}
/**
* Diagnostic to print number of DCBs in persistent pool for a server
*
* @param pdcb DCB to print results to
* @param server SERVER for which DCBs are to be printed
*/
void
dprintPersistentDCBs(DCB *pdcb, const SERVER *server)
{
dcb_printf(pdcb, "Number of persistent DCBs: %d\n", server->stats.n_persistent);
}
/**
* List all servers in a tabular form to a DCB
*
*/
void
dListServers(DCB *dcb)
{
spinlock_acquire(&server_spin);
SERVER *server = next_active_server(allServers);
bool have_servers = false;
if (server)
{
have_servers = true;
dcb_printf(dcb, "Servers.\n");
dcb_printf(dcb, "-------------------+-----------------+-------+-------------+--------------------\n");
dcb_printf(dcb, "%-18s | %-15s | Port | Connections | %-20s\n",
"Server", "Address", "Status");
dcb_printf(dcb, "-------------------+-----------------+-------+-------------+--------------------\n");
}
while (server)
{
char *stat = server_status(server);
dcb_printf(dcb, "%-18s | %-15s | %5d | %11d | %s\n",
server->unique_name, server->name,
server->port,
server->stats.n_current, stat);
MXS_FREE(stat);
server = next_active_server(server->next);
}
if (have_servers)
{
dcb_printf(dcb, "-------------------+-----------------+-------+-------------+--------------------\n");
}
spinlock_release(&server_spin);
}
/**
* Convert a set of server status flags to a string, the returned
* string has been malloc'd and must be free'd by the caller
*
* @param server The server to return the status of
* @return A string representation of the status flags
*/
char *
server_status(const SERVER *server)
{
char *status = NULL;
if (NULL == server || (status = (char *)MXS_MALLOC(512)) == NULL)
{
return NULL;
}
uint64_t server_status = server->status;
status[0] = 0;
if (server_status & SERVER_MAINT)
{
strcat(status, "Maintenance, ");
}
if (server_status & SERVER_MASTER)
{
strcat(status, "Master, ");
}
if (server_status & SERVER_RELAY_MASTER)
{
strcat(status, "Relay Master, ");
}
if (server_status & SERVER_SLAVE)
{
strcat(status, "Slave, ");
}
if (server_status & SERVER_JOINED)
{
strcat(status, "Synced, ");
}
if (server_status & SERVER_NDB)
{
strcat(status, "NDB, ");
}
if (server_status & SERVER_SLAVE_OF_EXTERNAL_MASTER)
{
strcat(status, "Slave of External Server, ");
}
if (server_status & SERVER_MASTER_STICKINESS)
{
strcat(status, "Master Stickiness, ");
}
if (server_status & SERVER_AUTH_ERROR)
{
strcat(status, "Auth Error, ");
}
if (server_status & SERVER_RUNNING)
{
strcat(status, "Running");
}
else
{
strcat(status, "Down");
}
return status;
}
/**
* Set a status bit in the server without locking
*
* @param server The server to update
* @param bit The bit to set for the server
*/
void
server_set_status_nolock(SERVER *server, uint64_t bit)
{
server->status |= bit;
/** clear error logged flag before the next failure */
if (SERVER_IS_MASTER(server))
{
server->master_err_is_logged = false;
}
}
/**
* Set one or more status bit(s) from a specified set, clearing any others
* in the specified set
*
* @attention This function does no locking
*
* @param server The server to update
* @param bit The bit to set for the server
*/
void
server_clear_set_status(SERVER *server, uint64_t specified_bits, uint64_t bits_to_set)
{
/** clear error logged flag before the next failure */
if ((bits_to_set & SERVER_MASTER) && ((server->status & SERVER_MASTER) == 0))
{
server->master_err_is_logged = false;
}
if ((server->status & specified_bits) != bits_to_set)
{
server->status = (server->status & ~specified_bits) | bits_to_set;
}
}
/**
* Clear a status bit in the server without locking
*
* @param server The server to update
* @param bit The bit to clear for the server
*/
void
server_clear_status_nolock(SERVER *server, uint64_t bit)
{
server->status &= ~bit;
}
/**
* Transfer status bitstring from one server to another
*
* @attention This function does no locking
*
* @param dest_server The server to be updated
* @param source_server The server to provide the new bit string
*/
void
server_transfer_status(SERVER *dest_server, const SERVER *source_server)
{
dest_server->status = source_server->status;
}
/**
* Add a user name and password to use for monitoring the
* state of the server.
*
* @param server The server to update
* @param user The user name to use
* @param passwd The password of the user
*/
void
server_add_mon_user(SERVER *server, const char *user, const char *passwd)
{
if (user != server->monuser &&
snprintf(server->monuser, sizeof(server->monuser), "%s", user) > (int)sizeof(server->monuser))
{
MXS_WARNING("Truncated monitor user for server '%s', maximum username "
"length is %lu characters.", server->unique_name, sizeof(server->monuser));
}
if (passwd != server->monpw &&
snprintf(server->monpw, sizeof(server->monpw), "%s", passwd) > (int)sizeof(server->monpw))
{
MXS_WARNING("Truncated monitor password for server '%s', maximum password "
"length is %lu characters.", server->unique_name, sizeof(server->monpw));
}
}
/**
* Check and update a server definition following a configuration
* update. Changes will not affect any current connections to this
* server, however all new connections will use the new settings.
*
* If the new settings are different from those already applied to the
* server then a message will be written to the log.
*
* @param server The server to update
* @param protocol The new protocol for the server
* @param user The monitor user for the server
* @param passwd The password to use for the monitor user
*/
void
server_update_credentials(SERVER *server, const char *user, const char *passwd)
{
if (user != NULL && passwd != NULL)
{
server_add_mon_user(server, user, passwd);
}
}
static SERVER_PARAM* allocate_parameter(const char* name, const char* value)
{
char *my_name = MXS_STRDUP(name);
char *my_value = MXS_STRDUP(value);
SERVER_PARAM *param = (SERVER_PARAM *)MXS_MALLOC(sizeof(SERVER_PARAM));
if (!my_name || !my_value || !param)
{
MXS_FREE(my_name);
MXS_FREE(my_value);
MXS_FREE(param);
return NULL;
}
param->active = true;
param->name = my_name;
param->value = my_value;
return param;
}
/**
* Add a server parameter to a server.
*
* Server parameters may be used by routing to weight the load
* balancing they apply to the server.
*
* @param server The server we are adding the parameter to
* @param name The parameter name
* @param value The parameter value
*/
void server_add_parameter(SERVER *server, const char *name, const char *value)
{
SERVER_PARAM* param = allocate_parameter(name, value);
if (param)
{
spinlock_acquire(&server->lock);
param->next = server->parameters;
server->parameters = param;
spinlock_release(&server->lock);
}
}
bool server_remove_parameter(SERVER *server, const char *name)
{
bool rval = false;
spinlock_acquire(&server->lock);
for (SERVER_PARAM *p = server->parameters; p; p = p->next)
{
if (strcmp(p->name, name) == 0 && p->active)
{
p->active = false;
rval = true;
break;
}
}
spinlock_release(&server->lock);
return rval;
}
void server_update_parameter(SERVER *server, const char *name, const char *value)
{
SERVER_PARAM* param = allocate_parameter(name, value);
if (param)
{
spinlock_acquire(&server->lock);
// Insert new value
param->next = server->parameters;
server->parameters = param;
// Mark old value, if found, as inactive
for (SERVER_PARAM *p = server->parameters->next; p; p = p->next)
{
if (strcmp(p->name, name) == 0 && p->active)
{
p->active = false;
break;
}
}
spinlock_release(&server->lock);
}
}
/**
* Free a list of server parameters
* @param tofree Parameter list to free
*/
static void server_parameter_free(SERVER_PARAM *tofree)
{
SERVER_PARAM *param;
if (tofree)
{
param = tofree;
tofree = tofree->next;
MXS_FREE(param->name);
MXS_FREE(param->value);
MXS_FREE(param);
}
}
/**
* Same as server_get_parameter but doesn't lock the server
*
* @note Should only be called when the server is already locked
*/
size_t server_get_parameter_nolock(const SERVER *server, const char *name, char* out, size_t size)
{
ss_dassert(SPINLOCK_IS_LOCKED(&server->lock));
size_t len = 0;
SERVER_PARAM *param = server->parameters;
while (param)
{
if (strcmp(param->name, name) == 0 && param->active)
{
len = snprintf(out, out ? size : 0, "%s", param->value);
break;
}
param = param->next;
}
return len;
}
/**
* Retrieve a parameter value from a server
*
* @param server The server we are looking for a parameter of
* @param name The name of the parameter we require
* @param out Buffer where value is stored, use NULL to check if the parameter exists
* @param size Size of @c out, ignored if @c out is NULL
*
* @return Length of the parameter value or 0 if parameter was not found
*/
size_t server_get_parameter(const SERVER *server, const char *name, char* out, size_t size)
{
spinlock_acquire(&server->lock);
size_t len = server_get_parameter_nolock(server, name, out, size);
spinlock_release(&server->lock);
return len;
}
/**
* Provide a row to the result set that defines the set of servers
*
* @param set The result set
* @param data The index of the row to send
* @return The next row or NULL
*/
static RESULT_ROW *
serverRowCallback(RESULTSET *set, void *data)
{
int *rowno = (int *)data;
int i = 0;
char *stat = NULL, buf[20];
RESULT_ROW *row = NULL;
SERVER *server = NULL;
spinlock_acquire(&server_spin);
server = allServers;
while (i < *rowno && server)
{
i++;
server = server->next;
}
if (server == NULL)
{
spinlock_release(&server_spin);
MXS_FREE(data);
return NULL;
}
(*rowno)++;
if (SERVER_IS_ACTIVE(server))
{
row = resultset_make_row(set);
resultset_row_set(row, 0, server->unique_name);
resultset_row_set(row, 1, server->name);
sprintf(buf, "%d", server->port);
resultset_row_set(row, 2, buf);
sprintf(buf, "%d", server->stats.n_current);
resultset_row_set(row, 3, buf);
stat = server_status(server);
resultset_row_set(row, 4, stat);
MXS_FREE(stat);
}
spinlock_release(&server_spin);
return row;
}
/**
* Return a resultset that has the current set of servers in it
*
* @return A Result set
*/
RESULTSET *
serverGetList()
{
RESULTSET *set;
int *data;
if ((data = (int *)MXS_MALLOC(sizeof(int))) == NULL)
{
return NULL;
}
*data = 0;
if ((set = resultset_create(serverRowCallback, data)) == NULL)
{
MXS_FREE(data);
return NULL;
}
resultset_add_column(set, "Server", 20, COL_TYPE_VARCHAR);
resultset_add_column(set, "Address", 15, COL_TYPE_VARCHAR);
resultset_add_column(set, "Port", 5, COL_TYPE_VARCHAR);
resultset_add_column(set, "Connections", 8, COL_TYPE_VARCHAR);
resultset_add_column(set, "Status", 20, COL_TYPE_VARCHAR);
return set;
}
/*
* Update the address value of a specific server
*
* @param server The server to update
* @param address The new address
*
*/
void
server_update_address(SERVER *server, const char *address)
{
spinlock_acquire(&server_spin);
if (server && address)
{
strcpy(server->name, address);
}
spinlock_release(&server_spin);
}
/*
* Update the port value of a specific server
*
* @param server The server to update
* @param port The new port value
*
*/
void
server_update_port(SERVER *server, unsigned short port)
{
spinlock_acquire(&server_spin);
if (server && port > 0)
{
server->port = port;
}
spinlock_release(&server_spin);
}
static struct
{
const char* str;
uint64_t bit;
} ServerBits[] =
{
{ "running", SERVER_RUNNING },
{ "master", SERVER_MASTER },
{ "slave", SERVER_SLAVE },
{ "synced", SERVER_JOINED },
{ "ndb", SERVER_NDB },
{ "maintenance", SERVER_MAINT },
{ "maint", SERVER_MAINT },
{ "stale", SERVER_STALE_STATUS },
{ NULL, 0 }
};
/**
* Map the server status bit
*
* @param str String representation
* @return bit value or 0 on error
*/
uint64_t
server_map_status(const char *str)
{
int i;
for (i = 0; ServerBits[i].str; i++)
{
if (!strcasecmp(str, ServerBits[i].str))
{
return ServerBits[i].bit;
}
}
return 0;
}
/**
* Set the version string of the server.
*
* @param server Server to update
* @param version_string Version string
*/
void server_set_version_string(SERVER* server, const char* version_string)
{
// There is a race here. The string may be accessed, while we are
// updating it. Thus we take some precautions to ensure that the
// string cannot be completely garbled at any point.
size_t old_len = strlen(server->version_string);
size_t new_len = strlen(version_string);
if (new_len >= MAX_SERVER_VERSION_LEN)
{
new_len = MAX_SERVER_VERSION_LEN - 1;
}
if (new_len < old_len)
{
// If the new string is shorter, we start by nulling out the
// excess data.
memset(server->version_string + new_len, 0, old_len - new_len);
}
strncpy(server->version_string, version_string, new_len);
// No null-byte needs to be set. The array starts out as all zeros
// and the above memset adds the necessary null, should the new string
// be shorter than the old.
}
/**
* Set the version of the server.
*
* @param server Server to update
* @param version_string Human readable version string.
* @param version Version encoded as MariaDB encodes the version, i.e.:
* version = major * 10000 + minor * 100 + patch
*/
void server_set_version(SERVER* server, const char* version_string, uint64_t version)
{
server_set_version_string(server, version_string);
atomic_store_uint64(&server->version, version);
}
uint64_t server_get_version(const SERVER* server)
{
return atomic_load_uint64(&server->version);
}
/**
* Creates a server configuration at the location pointed by @c filename
*
* @param server Server to serialize into a configuration
* @param filename Filename where configuration is written
* @return True on success, false on error
*/
static bool create_server_config(const SERVER *server, const char *filename)
{
int file = open(filename, O_EXCL | O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (file == -1)
{
MXS_ERROR("Failed to open file '%s' when serializing server '%s': %d, %s",
filename, server->unique_name, errno, mxs_strerror(errno));
return false;
}
// TODO: Check for return values on all of the dprintf calls
dprintf(file, "[%s]\n", server->unique_name);
dprintf(file, "%s=server\n", CN_TYPE);
dprintf(file, "%s=%s\n", CN_PROTOCOL, server->protocol);
dprintf(file, "%s=%s\n", CN_ADDRESS, server->name);
dprintf(file, "%s=%u\n", CN_PORT, server->port);
dprintf(file, "%s=%s\n", CN_AUTHENTICATOR, server->authenticator);
if (server->auth_options)
{
dprintf(file, "%s=%s\n", CN_AUTHENTICATOR_OPTIONS, server->auth_options);
}
if (*server->monpw && *server->monuser)
{
dprintf(file, "%s=%s\n", CN_MONITORUSER, server->monuser);
dprintf(file, "%s=%s\n", CN_MONITORPW, server->monpw);
}
if (server->persistpoolmax)
{
dprintf(file, "%s=%ld\n", CN_PERSISTPOOLMAX, server->persistpoolmax);
}
if (server->persistmaxtime)
{
dprintf(file, "%s=%ld\n", CN_PERSISTMAXTIME, server->persistmaxtime);
}
if (server->proxy_protocol)
{
dprintf(file, "%s=on\n", CN_PROXY_PROTOCOL);
}
for (SERVER_PARAM *p = server->parameters; p; p = p->next)
{
if (p->active)
{
dprintf(file, "%s=%s\n", p->name, p->value);
}
}
if (server->server_ssl)
{
write_ssl_config(file, server->server_ssl);
}
close(file);
return true;
}
bool server_serialize(const SERVER *server)
{
bool rval = false;
char filename[PATH_MAX];
snprintf(filename, sizeof(filename), "%s/%s.cnf.tmp", get_config_persistdir(),
server->unique_name);
if (unlink(filename) == -1 && errno != ENOENT)
{
MXS_ERROR("Failed to remove temporary server configuration at '%s': %d, %s",
filename, errno, mxs_strerror(errno));
}
else if (create_server_config(server, filename))
{
char final_filename[PATH_MAX];
strcpy(final_filename, filename);
char *dot = strrchr(final_filename, '.');
ss_dassert(dot);
*dot = '\0';
if (rename(filename, final_filename) == 0)
{
rval = true;
}
else
{
MXS_ERROR("Failed to rename temporary server configuration at '%s': %d, %s",
filename, errno, mxs_strerror(errno));
}
}
return rval;
}
SERVER* server_repurpose_destroyed(const char *name, const char *protocol,
const char *authenticator, const char *auth_options,
const char *address, const char *port)
{
spinlock_acquire(&server_spin);
SERVER *server = allServers;
while (server)
{
CHK_SERVER(server);
if (strcmp(server->unique_name, name) == 0 &&
strcmp(server->protocol, protocol) == 0 &&
strcmp(server->authenticator, authenticator) == 0)
{
if ((auth_options == NULL && server->auth_options == NULL) ||
(auth_options && server->auth_options &&
strcmp(server->auth_options, auth_options) == 0))
{
snprintf(server->name, sizeof(server->name), "%s", address);
server->port = atoi(port);
server->is_active = true;
break;
}
}
server = server->next;
}
spinlock_release(&server_spin);
return server;
}
/**
* Set a status bit in the server under a lock. This ensures synchronization
* with the server monitor thread. Calling this inside the monitor will likely
* cause a deadlock. If the server is monitored, only set the pending bit.
*
* @param server The server to update
* @param bit The bit to set for the server
*/
void server_set_status(SERVER *server, int bit)
{
/* First check if the server is monitored. This isn't done under a lock
* but the race condition cannot cause significant harm. Monitors are never
* freed so the pointer stays valid.
*/
MXS_MONITOR *mon = monitor_server_in_use(server);
spinlock_acquire(&server->lock);
if (mon && mon->state == MONITOR_STATE_RUNNING)
{
/* Set a pending status bit. It will be activated on the next monitor
* loop. Also set a flag so the next loop happens sooner.
*/
server->status_pending |= bit;
mon->server_pending_changes = true;
}
else
{
/* Set the bit directly */
server_set_status_nolock(server, bit);
}
spinlock_release(&server->lock);
}
/**
* Clear a status bit in the server under a lock. This ensures synchronization
* with the server monitor thread. Calling this inside the monitor will likely
* cause a deadlock. If the server is monitored, only clear the pending bit.
*
* @param server The server to update
* @param bit The bit to clear for the server
*/
void server_clear_status(SERVER *server, int bit)
{
MXS_MONITOR *mon = monitor_server_in_use(server);
spinlock_acquire(&server->lock);
if (mon && mon->state == MONITOR_STATE_RUNNING)
{
/* Clear a pending status bit. It will be activated on the next monitor
* loop. Also set a flag so the next loop happens sooner.
*/
server->status_pending &= ~bit;
mon->server_pending_changes = true;
}
else
{
/* Clear bit directly */
server_clear_status_nolock(server, bit);
}
spinlock_release(&server->lock);
}
bool server_is_mxs_service(const SERVER *server)
{
bool rval = false;
/** Do a coarse check for local server pointing to a MaxScale service */
if (strcmp(server->name, "127.0.0.1") == 0 ||
strcmp(server->name, "::1") == 0 ||
strcmp(server->name, "localhost") == 0 ||
strcmp(server->name, "localhost.localdomain") == 0)
{
if (service_port_is_used(server->port))
{
rval = true;
}
}
return rval;
}
static json_t* server_json_attributes(const SERVER* server)
{
/** Resource attributes */
json_t* attr = json_object();
/** Store server parameters in attributes */
json_t* params = json_object();
json_object_set_new(params, CN_ADDRESS, json_string(server->name));
json_object_set_new(params, CN_PORT, json_integer(server->port));
json_object_set_new(params, CN_PROTOCOL, json_string(server->protocol));
if (server->authenticator)
{
json_object_set_new(params, CN_AUTHENTICATOR, json_string(server->authenticator));
}
if (server->auth_options)
{
json_object_set_new(params, CN_AUTHENTICATOR_OPTIONS, json_string(server->auth_options));
}
if (*server->monuser)
{
json_object_set_new(params, CN_MONITORUSER, json_string(server->monuser));
}
if (*server->monpw)
{
json_object_set_new(params, CN_MONITORPW, json_string(server->monpw));
}
if (server->server_ssl)
{
json_object_set_new(params, CN_SSL_KEY, json_string(server->server_ssl->ssl_key));
json_object_set_new(params, CN_SSL_CERT, json_string(server->server_ssl->ssl_cert));
json_object_set_new(params, CN_SSL_CA_CERT, json_string(server->server_ssl->ssl_ca_cert));
json_object_set_new(params, CN_SSL_CERT_VERIFY_DEPTH,
json_integer(server->server_ssl->ssl_cert_verify_depth));
json_object_set_new(params, CN_SSL_VERIFY_PEER_CERTIFICATE,
json_boolean(server->server_ssl->ssl_verify_peer_certificate));
json_object_set_new(params, CN_SSL_VERSION,
json_string(ssl_method_type_to_string(server->server_ssl->ssl_method_type)));
}
for (SERVER_PARAM* p = server->parameters; p; p = p->next)
{
json_object_set_new(params, p->name, json_string(p->value));
}
json_object_set_new(attr, CN_PARAMETERS, params);
/** Store general information about the server state */
char* stat = server_status(server);
json_object_set_new(attr, CN_STATE, json_string(stat));
MXS_FREE(stat);
json_object_set_new(attr, CN_VERSION_STRING, json_string(server->version_string));
json_object_set_new(attr, "node_id", json_integer(server->node_id));
json_object_set_new(attr, "master_id", json_integer(server->master_id));
json_object_set_new(attr, "replication_depth", json_integer(server->depth));
const char* event_name = mon_get_event_name((mxs_monitor_event_t)server->last_event);
time_t t = maxscale_started() + HB_TO_SEC(server->triggered_at);
json_object_set_new(attr, "last_event", json_string(event_name));
json_object_set_new(attr, "triggered_at", json_string(http_to_date(t).c_str()));
if (server->slaves)
{
json_t* slaves = json_array();
for (int i = 0; server->slaves[i]; i++)
{
json_array_append_new(slaves, json_integer(server->slaves[i]));
}
json_object_set_new(attr, "slaves", slaves);
}
if (server->rlag >= 0)
{
json_object_set_new(attr, "replication_lag", json_integer(server->rlag));
}
if (server->node_ts > 0)
{
struct tm result;
char timebuf[30];
time_t tim = server->node_ts;
asctime_r(localtime_r(&tim, &result), timebuf);
trim(timebuf);
json_object_set_new(attr, "last_heartbeat", json_string(timebuf));
}
/** Store statistics */
json_t* stats = json_object();
json_object_set_new(stats, "connections", json_integer(server->stats.n_current));
json_object_set_new(stats, "total_connections", json_integer(server->stats.n_connections));
json_object_set_new(stats, "persistent_connections", json_integer(server->stats.n_persistent));
json_object_set_new(stats, "active_operations", json_integer(server->stats.n_current_ops));
json_object_set_new(stats, "routed_packets", json_integer(server->stats.packets));
json_object_set_new(attr, "statistics", stats);
return attr;
}
static json_t* server_to_json_data(const SERVER* server, const char* host)
{
json_t* rval = json_object();
/** Add resource identifiers */
json_object_set_new(rval, CN_ID, json_string(server->unique_name));
json_object_set_new(rval, CN_TYPE, json_string(CN_SERVERS));
/** Relationships */
json_t* rel = json_object();
json_t* service_rel = service_relations_to_server(server, host);
json_t* monitor_rel = monitor_relations_to_server(server, host);
if (service_rel)
{
json_object_set_new(rel, CN_SERVICES, service_rel);
}
if (monitor_rel)
{
json_object_set_new(rel, CN_MONITORS, monitor_rel);
}
json_object_set_new(rval, CN_RELATIONSHIPS, rel);
/** Attributes */
json_object_set_new(rval, CN_ATTRIBUTES, server_json_attributes(server));
json_object_set_new(rval, CN_LINKS, mxs_json_self_link(host, CN_SERVERS, server->unique_name));
return rval;
}
json_t* server_to_json(const SERVER* server, const char* host)
{
string self = MXS_JSON_API_SERVERS;
self += server->unique_name;
return mxs_json_resource(host, self.c_str(), server_to_json_data(server, host));
}
json_t* server_list_to_json(const char* host)
{
json_t* data = json_array();
spinlock_acquire(&server_spin);
for (SERVER* server = allServers; server; server = server->next)
{
if (SERVER_IS_ACTIVE(server))
{
json_array_append_new(data, server_to_json_data(server, host));
}
}
spinlock_release(&server_spin);
return mxs_json_resource(host, MXS_JSON_API_SERVERS, data);
}
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