c7a424cdab
Addition of rule in readconnroute to take server state into account Addition of "current connections" statistic in the server
104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
#ifndef _SERVER_H
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#define _SERVER_H
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/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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*/
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#include <dcb.h>
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/**
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* @file service.h
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*
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* The server level definitions within the gateway
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 14/06/13 Mark Riddoch Initial implementation
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* 21/06/13 Mark Riddoch Addition of server status flags
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*
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* @endverbatim
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*/
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/**
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* The server statistics structure
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*
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*/
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typedef struct {
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int n_connections; /**< Number of connections */
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int n_current; /**< Current connections */
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} SERVER_STATS;
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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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char *name; /**< Server name/IP address*/
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unsigned short port; /**< Port to listen on */
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char *protocol; /**< Protocol module to use */
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unsigned int status; /**< Status flag bitmap for the server */
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SERVER_STATS stats; /**< The server statistics */
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struct server *next; /**< Next server */
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struct server *nextdb; /**< Next server in list attached to a service */
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} SERVER;
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/**
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* Status bits in the server->status member.
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*
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* These are a bitmap of attributes that may be applied to a server
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*/
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#define SERVER_RUNNING 0x0001 /**<< The server is up and running */
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#define SERVER_MASTER 0x0002 /**<< The server is a master, i.e. can handle writes */
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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)
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/**
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* Is the server marked as down - the macro returns true if the server is beleived
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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) \
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(((server)->status & (SERVER_RUNNING|SERVER_MASTER)) == (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_MASTER)) == SERVER_RUNNING)
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extern SERVER *server_alloc(char *, char *, unsigned short);
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extern int server_free(SERVER *);
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extern void printServer(SERVER *);
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extern void printAllServers();
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extern void dprintAllServers(DCB *);
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extern void dprintServer(DCB *, SERVER *);
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extern char *server_status(SERVER *);
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extern void server_set_status(SERVER *, int);
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extern void server_clear_status(SERVER *, int);
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#endif
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