400 lines
16 KiB
C
400 lines
16 KiB
C
#pragma once
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/*
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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: 2020-01-01
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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 server.h
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*
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* The server level definitions within the gateway
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*/
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#include <maxscale/cdefs.h>
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#include <maxscale/config.h>
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#include <maxscale/dcb.h>
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#include <maxscale/resultset.h>
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#include <maxscale/jansson.h>
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MXS_BEGIN_DECLS
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#define MAX_SERVER_ADDRESS_LEN 1024
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#define MAX_SERVER_MONUSER_LEN 1024
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#define MAX_SERVER_MONPW_LEN 1024
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#define MAX_SERVER_VERSION_LEN 256
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#define MAX_NUM_SLAVES 128 /**< Maximum number of slaves under a single server*/
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/**
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* Server configuration parameters names
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*/
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extern const char CN_MONITORPW[];
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extern const char CN_MONITORUSER[];
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extern const char CN_PERSISTMAXTIME[];
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extern const char CN_PERSISTPOOLMAX[];
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extern const char CN_PROXY_PROTOCOL[];
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/**
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* Maintenance mode request constants.
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*/
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const int MAINTENANCE_OFF = -100;
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const int MAINTENANCE_NO_CHANGE = 0;
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const int MAINTENANCE_ON = 100;
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const int MAINTENANCE_FLAG_NOCHECK = 0;
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const int MAINTENANCE_FLAG_CHECK = -1;
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/**
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* The server parameters used for weighting routing decissions
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*/
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typedef struct server_params
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{
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char *name; /**< Parameter name */
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char *value; /**< Parameter value */
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bool active; /**< Whether the parameter is valid */
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struct server_params *next; /**< Next Paramter in the linked list */
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} SERVER_PARAM;
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/**
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* The server statistics structure
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*/
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typedef struct
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{
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int n_connections; /**< Number of connections */
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int n_current; /**< Current connections */
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int n_current_ops; /**< Current active operations */
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int n_persistent; /**< Current persistent pool */
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uint64_t n_new_conn; /**< Times the current pool was empty */
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uint64_t n_from_pool; /**< Times when a connection was available from the pool */
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uint64_t packets; /**< Number of packets routed to this server */
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} SERVER_STATS;
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/**
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* The server version.
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*/
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typedef struct server_version
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{
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uint32_t major;
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uint32_t minor;
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uint32_t patch;
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} SERVER_VERSION;
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typedef enum
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{
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SERVER_TYPE_MARIADB,
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SERVER_TYPE_MYSQL
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} server_type_t;
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static inline void server_decode_version(uint64_t version, SERVER_VERSION* server_version)
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{
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uint32_t major = version / 10000;
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uint32_t minor = (version - major * 10000) / 100;
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uint32_t patch = version - major * 10000 - minor * 100;
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server_version->major = major;
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server_version->minor = minor;
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server_version->patch = patch;
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}
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static uint64_t server_encode_version(const SERVER_VERSION* server_version)
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{
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return server_version->major * 10000 + server_version->minor * 100 + server_version->patch;
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}
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/**
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* The SERVER structure defines a backend server. Each server has a name
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* or IP address for the server, a port that the server listens on and
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* the name of a protocol module that is loaded to implement the protocol
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* between the gateway and the server.
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*/
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typedef struct server
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{
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#if defined(SS_DEBUG)
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skygw_chk_t server_chk_top;
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#endif
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// Base settings
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char *name; /**< Server config name */
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char address[MAX_SERVER_ADDRESS_LEN]; /**< Server hostname/IP-address */
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unsigned short port; /**< Server port */
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char *protocol; /**< Backend protocol module name */
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char *authenticator; /**< Authenticator module name */
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// Other settings
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char monuser[MAX_SERVER_MONUSER_LEN]; /**< Monitor username, overrides monitor setting */
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char monpw[MAX_SERVER_MONPW_LEN]; /**< Monitor password, overrides monitor setting */
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long persistpoolmax; /**< Maximum size of persistent connections pool */
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long persistmaxtime; /**< Maximum number of seconds connection can live */
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bool proxy_protocol; /**< Send proxy-protocol header to backends when connecting
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* routing sessions. */
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SERVER_PARAM *parameters; /**< Additional custom parameters which may affect routing decisions. */
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// Base variables
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SPINLOCK lock; /**< Access lock. Required when modifying server status or settings. */
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struct server *next; /**< Next server in global server list */
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bool is_active; /**< Server is active and has not been "destroyed" */
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void *auth_instance; /**< Authenticator instance data */
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SSL_LISTENER *server_ssl; /**< SSL data */
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DCB **persistent; /**< List of unused persistent connections to the server */
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uint8_t charset; /**< Server character set. Read from backend and sent to client. */
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// Statistics and events
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SERVER_STATS stats; /**< The server statistics, e.g. number of connections */
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int persistmax; /**< Maximum pool size actually achieved since startup */
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int last_event; /**< The last event that occurred on this server */
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int64_t triggered_at; /**< Time when the last event was triggered */
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bool active_event; /**< Was MaxScale active when last event was observed */
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// Status descriptors. Updated automatically by a monitor or manually by the admin
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uint64_t status; /**< Current status flag bitmap */
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int maint_request; /**< Is admin requesting Maintenance=ON/OFF on the server? */
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char version_string[MAX_SERVER_VERSION_LEN]; /**< Server version string as given by backend */
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uint64_t version; /**< Server version numeric representation */
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server_type_t server_type; /**< Server type (MariaDB or MySQL), deduced from version string */
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long node_id; /**< Node id, server_id for M/S or local_index for Galera */
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int rlag; /**< Replication Lag for Master/Slave replication */
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unsigned long node_ts; /**< Last timestamp set from M/S monitor module */
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long master_id; /**< Master server id of this node */
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int depth; /**< Replication level in the tree */
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// Misc fields
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bool master_err_is_logged; /**< If node failed, this indicates whether it is logged. Only used
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* by rwsplit. TODO: Move to rwsplit */
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bool warn_ssl_not_enabled; /**< SSL not used for an SSL enabled server */
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MxsDiskSpaceThreshold* disk_space_threshold; /**< Disk space thresholds */
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#if defined(SS_DEBUG)
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skygw_chk_t server_chk_tail;
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#endif
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} SERVER;
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enum
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{
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MAX_RLAG_NOT_AVAILABLE = -1,
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MAX_RLAG_UNDEFINED = -2
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};
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/**
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* Status bits in the SERVER->status member, which describes the general state of a server. Although the
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* individual bits are independent, not all combinations make sense or are used. The bitfield is 64bits wide.
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*/
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// Bits used by most monitors
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#define SERVER_RUNNING (1 << 0) /**<< The server is up and running */
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#define SERVER_MAINT (1 << 1) /**<< Server is in maintenance mode */
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#define SERVER_AUTH_ERROR (1 << 2) /**<< Authentication error from monitor */
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#define SERVER_MASTER (1 << 3) /**<< The server is a master, i.e. can handle writes */
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#define SERVER_SLAVE (1 << 4) /**<< The server is a slave, i.e. can handle reads */
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// Bits used by MariaDB Monitor (mostly)
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#define SERVER_SLAVE_OF_EXT_MASTER (1 << 5) /**<< Server is slave of a non-monitored master */
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#define SERVER_RELAY_MASTER (1 << 6) /**<< Server is a relay master */
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#define SERVER_WAS_MASTER (1 << 7) /**<< Server was a master but lost all slaves. */
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#define SERVER_WAS_SLAVE (1 << 8) /**<< Server was a slave but lost its master. */
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// Bits used by other monitors
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#define SERVER_JOINED (1 << 9) /**<< The server is joined in a Galera cluster */
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#define SERVER_NDB (1 << 10) /**<< The server is part of a MySQL cluster setup */
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#define SERVER_MASTER_STICKINESS (1 << 11) /**<< Server Master stickiness */
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// Bits providing general information
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#define SERVER_DISK_SPACE_EXHAUSTED (1 << 31) /**<< The disk space of the server is exhausted */
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/**
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* Is the server valid and active
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*/
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#define SERVER_IS_ACTIVE(server) (server->is_active)
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/**
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* Is the server running - the macro returns true if the server is marked as running
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* regardless of it's state as a master or slave
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*/
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#define SERVER_IS_RUNNING(server) (((server)->status & (SERVER_RUNNING|SERVER_MAINT)) == SERVER_RUNNING)
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/**
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* Is the server marked as down - the macro returns true if the server is believed
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* to be inoperable.
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*/
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#define SERVER_IS_DOWN(server) (((server)->status & SERVER_RUNNING) == 0)
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/**
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* Is the server a master? The server must be both running and marked as master
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* in order for the macro to return true
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*/
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#define SERVER_IS_MASTER(server) SRV_MASTER_STATUS((server)->status)
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#define SRV_MASTER_STATUS(status) ((status & \
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(SERVER_RUNNING|SERVER_MASTER|SERVER_MAINT)) == \
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(SERVER_RUNNING|SERVER_MASTER))
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/**
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* Is the server a slave? The server must be both running and marked as a slave
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* in order for the macro to return true
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*/
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#define SERVER_IS_SLAVE(server) \
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(((server)->status & (SERVER_RUNNING|SERVER_SLAVE|SERVER_MAINT)) == \
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(SERVER_RUNNING|SERVER_SLAVE))
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/**
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* Is the server joined Galera node? The server must be running and joined.
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*/
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#define SERVER_IS_JOINED(server) \
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(((server)->status & (SERVER_RUNNING|SERVER_JOINED|SERVER_MAINT)) == (SERVER_RUNNING|SERVER_JOINED))
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/**
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* Is the server a SQL node in MySQL Cluster? The server must be running and with NDB status
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*/
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#define SERVER_IS_NDB(server) \
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(((server)->status & (SERVER_RUNNING|SERVER_NDB|SERVER_MAINT)) == (SERVER_RUNNING|SERVER_NDB))
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/**
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* Is the server in maintenance mode.
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*/
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#define SERVER_IN_MAINT(server) ((server)->status & SERVER_MAINT)
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#define SERVER_IS_IN_CLUSTER(s) (((s)->status & (SERVER_MASTER|SERVER_SLAVE|SERVER_JOINED|SERVER_NDB)) != 0)
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#define SERVER_IS_RELAY_SERVER(server) \
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(((server)->status & (SERVER_RUNNING|SERVER_MASTER|SERVER_SLAVE|SERVER_MAINT)) == \
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(SERVER_RUNNING|SERVER_MASTER|SERVER_SLAVE))
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#define SERVER_IS_SLAVE_OF_EXT_MASTER(s) (((s)->status & \
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(SERVER_RUNNING|SERVER_SLAVE_OF_EXT_MASTER)) == \
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(SERVER_RUNNING|SERVER_SLAVE_OF_EXT_MASTER))
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#define SERVER_IS_DISK_SPACE_EXHAUSTED(s) ((s)->status & SERVER_DISK_SPACE_EXHAUSTED)
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/**
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* @brief Allocate a new server
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*
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* This will create a new server that represents a backend server that services
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* can use. This function will add the server to the running configuration but
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* will not persist the changes.
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*
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* @param name Unique server name
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* @param address The server address
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* @param port The port to connect to
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* @param protocol The protocol to use to connect to the server
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* @param authenticator The server authenticator module
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* @return The newly created server or NULL if an error occurred
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*/
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extern SERVER* server_alloc(const char *name, const char *address, unsigned short port,
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const char *protocol, const char *authenticator);
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/**
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* @brief Find a server that can be reused
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*
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* A server that has been destroyed will not be deleted but only deactivated.
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*
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* @param name Name of the server
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* @param protocol Protocol used by the server
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* @param authenticator The authenticator module of the server
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* @param address The network address of the new server
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* @param port The port of the new server
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*
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* @return Repurposed SERVER or NULL if no servers matching the criteria were
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* found
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* @see runtime_create_server
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*/
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SERVER* server_repurpose_destroyed(const char *name, const char *protocol, const char *authenticator,
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const char *address, const char *port);
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/**
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* @brief Serialize a server to a file
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*
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* This converts @c server into an INI format file. This allows created servers
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* to be persisted to disk. This will replace any existing files with the same
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* name.
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*
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* @param server Server to serialize
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* @return False if the serialization of the server fails, true if it was successful
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*/
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bool server_serialize(const SERVER *server);
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/**
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* @brief Add a server parameter
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*
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* @param server Server where the parameter is added
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* @param name Parameter name
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* @param value Parameter value
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*/
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void server_add_parameter(SERVER *server, const char *name, const char *value);
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/**
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* @brief Remove a server parameter
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*
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* @param server Server to remove the parameter from
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* @param name The name of the parameter to remove
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* @return True if a parameter was removed
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*/
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bool server_remove_parameter(SERVER *server, const char *name);
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/**
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* @brief Update server parameter
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*
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* @param server Server to update
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* @param name Parameter to update
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* @param value New value of parameter
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*/
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void server_update_parameter(SERVER *server, const char *name, const char *value);
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/**
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* @brief Check if a server points to a local MaxScale service
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*
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* @param server Server to check
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* @return True if the server points to a local MaxScale service
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*/
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bool server_is_mxs_service(const SERVER *server);
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/**
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* @brief Convert a server to JSON format
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*
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* @param server Server to convert
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* @param host Hostname of this server
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*
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* @return JSON representation of server or NULL if an error occurred
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*/
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json_t* server_to_json(const SERVER* server, const char* host);
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/**
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* @brief Convert all servers into JSON format
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*
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* @param host Hostname of this server
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*
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* @return JSON array of servers or NULL if an error occurred
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*/
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json_t* server_list_to_json(const char* host);
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/**
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* @brief Set the disk space threshold of the server
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*
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* @param server The server.
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* @param disk_space_threshold The disk space threshold as specified in the config file.
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*
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* @return True, if the provided string is valid and the threshold could be set.
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*/
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bool server_set_disk_space_threshold(SERVER *server, const char *disk_space_threshold);
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extern int server_free(SERVER *server);
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extern SERVER *server_find_by_unique_name(const char *name);
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extern int server_find_by_unique_names(char **server_names, int size, SERVER*** output);
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extern SERVER *server_find(const char *servname, unsigned short port);
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extern char *server_status(const SERVER *);
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extern void server_clear_set_status_nolock(SERVER *server, uint64_t bits_to_clear, uint64_t bits_to_set);
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extern void server_set_status_nolock(SERVER *server, uint64_t bit);
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extern void server_clear_status_nolock(SERVER *server, uint64_t bit);
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extern void server_transfer_status(SERVER *dest_server, const SERVER *source_server);
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extern void server_add_mon_user(SERVER *server, const char *user, const char *passwd);
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extern size_t server_get_parameter(const SERVER *server, const char *name, char* out, size_t size);
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extern void server_update_credentials(SERVER *server, const char *user, const char *passwd);
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extern DCB* server_get_persistent(SERVER *server, const char *user, const char* ip, const char *protocol, int id);
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extern void server_update_address(SERVER *server, const char *address);
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extern void server_update_port(SERVER *server, unsigned short port);
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extern uint64_t server_map_status(const char *str);
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extern void server_set_version_string(SERVER* server, const char* version_string);
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extern void server_set_version(SERVER* server, const char* version_string, uint64_t version);
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extern uint64_t server_get_version(const SERVER* server);
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extern void printServer(const SERVER *);
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extern void printAllServers();
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extern void dprintAllServers(DCB *);
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extern void dprintAllServersJson(DCB *);
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extern void dprintServer(DCB *, const SERVER *);
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extern void dprintPersistentDCBs(DCB *, const SERVER *);
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extern void dListServers(DCB *);
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extern RESULTSET *serverGetList();
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MXS_END_DECLS
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