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/*
* Copyright (C) 2011 Jiaju Zhang <jjzhang@suse.de>
* Copyright (C) 2013-2014 Philipp Marek <philipp.marek@linbit.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include <stdint.h>
#include "booth.h"
#include "timer.h"
#include "raft.h"
#include "transport.h"
/** @{ */
/** Definitions for in-RAM data. */
#define MAX_NODES 16
#define TICKET_ALLOC 16
struct ticket_config {
/** \name Configuration items.
* @{ */
/** Name of ticket. */
boothc_ticket name;
/** How many seconds a term lasts (if not refreshed). */
int term_duration;
/** Network related timeouts. */
int timeout;
/** Retries before giving up. */
int retries;
/** If >0, time to wait for a site to get fenced.
* The ticket may be acquired after that timespan by
* another site. */
int acquire_after; /* TODO: needed? */
/* How often to renew the ticket
*/
int renewal_freq;
/* Program to ask whether it makes sense to
* acquire the ticket */
char *ext_verifier;
/** Node weights. */
int weight[MAX_NODES];
/** @} */
/** \name Runtime values.
* @{ */
/** Current state. */
server_state_e state;
/** Next state. Used at startup. */
server_state_e next_state;
/** When something has to be done */
timetype next_cron;
/** The client which sent a request */
struct client *req_client;
/** Current leader. This is effectively the log[] in Raft. */
struct booth_site *leader;
/** Leader that got lost. */
struct booth_site *lost_leader;
/** Is the ticket granted? */
int is_granted;
/** Timestamp of leadership expiration */
time_t term_expires;
/** End of election period */
time_t election_end;
struct booth_site *voted_for;
/** Who the various sites vote for.
* NO_OWNER = no vote yet. */
struct booth_site *votes_for[MAX_NODES];
/* bitmap */
uint64_t votes_received;
/** Last voting round that was seen. */
uint32_t current_term;
/** Do ticket updates whenever we get enough heartbeats.
* But do that only once.
* This is reset to 0 whenever we broadcast heartbeat and set
* to 1 once enough acks are received.
* Increased to 2 when the ticket is commited to the CIB (see
* delay_commit).
*/
uint32_t ticket_updated;
/** @} */
/** */
uint32_t last_applied;
uint32_t next_index[MAX_NODES];
uint32_t match_index[MAX_NODES];
/* Why did we start the elections?
*/
cmd_reason_t election_reason;
/* if it is potentially dangerous to grant the ticket
* immediately, then this is set to some point in time,
* usually (now + term_duration + acquire_after)
*/
time_t delay_commit;
/* the last request RPC we sent
*/
uint32_t last_request;
/* if we expect some acks, then set this to the id of
* the RPC which others will send us; it is cleared once all
* replies were received
*/
uint32_t acks_expected;
/* bitmask of servers which sent acks
*/
uint64_t acks_received;
/* timestamp of the request */
time_t req_sent_at;
/* we need to wait for MY_INDEX from other servers,
* hold the ticket processing for a while until they reply
*/
int start_postpone;
/** Last renewal time */
time_t last_renewal;
/* Do we need to update the copy in the CIB?
* Normally, the ticket is written only when it changes via
* the UPDATE RPC (for followers) and on expiration update
* (for leaders)
*/
int update_cib;
/* Is this ticket in election?
*/
int in_election;
/* don't log warnings unnecessarily
*/
int expect_more_rejects;
/** \name Needed while proposals are being done.
* @{ */
/* Need to keep the previous valid ticket in case we moved to
* start new elections and another server asks for the ticket
* status. It would be wrong to send our candidate ticket.
*/
struct ticket_config *last_valid_tk;
/** Whom to vote for the next time.
* Needed to push a ticket to someone else. */
#if 0
/** Bitmap of sites that acknowledge that state. */
uint64_t proposal_acknowledges;
/** When an incompletely acknowledged proposal gets done.
* If all peers agree, that happens sooner.
* See switch_state_to(). */
struct timeval proposal_switch;
/** Timestamp of proposal expiration. */
time_t proposal_expires;
#endif
/** Number of send retries left.
* Used on the new owner.
* Starts at 0, counts up. */
int retry_number;
/** @} */
};
struct booth_config {
char name[BOOTH_NAME_LEN];
transport_layer_t proto;
uint16_t port;
/** Stores the OR of sites bitmasks. */
uint64_t sites_bits;
/** Stores the OR of all members' bitmasks. */
uint64_t all_bits;
char site_user[BOOTH_NAME_LEN];
char site_group[BOOTH_NAME_LEN];
char arb_user[BOOTH_NAME_LEN];
char arb_group[BOOTH_NAME_LEN];
uid_t uid;
gid_t gid;
int site_count;
struct booth_site site[MAX_NODES];
int ticket_count;
int ticket_allocated;
struct ticket_config *ticket;
};
extern struct booth_config *booth_conf;
int read_config(const char *path, int type);
int check_config(int type);
int find_site_by_name(unsigned char *site, struct booth_site **node, int any_type);
int find_site_by_id(uint32_t site_id, struct booth_site **node);
const char *type_to_string(int type);
#endif /* _CONFIG_H */

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