/* Try to acquire a ticket
* Could be manual grant or after start (if the ticket is granted
* and still valid in the CIB)
* If the external program needs to run, this is run twice, once
* to start the program, and then to get the result and start
* elections.
*/
int acquire_ticket(struct ticket_config *tk, cmd_reason_t reason)
{
int rv;
if (reason == OR_ADMIN && check_attr_prereq(tk, GRANT_MANUAL))
return RLT_ATTR_PREREQ;
switch(do_ext_prog(tk, 0)) {
case 0:
/* everything fine */
break;
case RUNCMD_MORE:
/* need to wait for the outcome before starting elections */
return 0;
default:
return RLT_EXT_FAILED;
}
if (is_manual(tk)) {
rv = manual_selection(tk, local, 1, reason);
} else {
rv = new_election(tk, local, 1, reason);
}
return rv ? RLT_SYNC_FAIL : 0;
}
int new_election(struct ticket_config *tk,
struct booth_site *preference, int update_term, cmd_reason_t reason)
{
struct booth_site *new_leader;
if (local->type != SITE)
return 0;
if ((is_reason(OR_TKT_LOST, tk) || is_reason(OR_STEPDOWN, tk)) &&
check_attr_prereq(tk, GRANT_AUTO)) {
tk_log_info("attribute prerequisite not met, "
"not starting elections");
return 0;
}
/* elections were already started, but not yet finished/timed out */
if (is_time_set(&tk->election_end) && !is_past(&tk->election_end))
return 1;
if (ANYDEBUG) {
int tdiff;
if (is_time_set(&tk->election_end)) {
tdiff = -time_left(&tk->election_end);
tk_log_debug("starting elections, previous finished since " intfmt(tdiff));
} else {
tk_log_debug("starting elections");
}
tk_log_debug("elections caused by %s %s",
state_to_string(reason),
reason == OR_AGAIN ? state_to_string(tk->election_reason) : "" );
}
/* §5.2 */
/* If there was _no_ answer, don't keep incrementing the term number
* indefinitely. If there was no peer, there'll probably be no one
* listening now either. However, we don't know if we were
* invoked due to a timeout (caller does).
*/
/* increment the term only if either the current term was
* valid or if there was a tie (in that case update_term > 1)
*/
if ((update_term > 1) ||
(update_term && tk->last_valid_tk &&
tk->last_valid_tk->current_term >= tk->current_term)) {
/* save the previous term, we may need to send out the
* MY_INDEX message */
if (tk->state != ST_CANDIDATE) {
save_committed_tkt(tk);
}
tk->current_term++;
}
set_future_time(&tk->election_end, tk->timeout);
tk->in_election = 1;
tk_log_info("starting new election (term=%d)",
tk->current_term);
clear_election(tk);
if(preference)
new_leader = preference;
else
new_leader = (local->type == SITE) ? local : NULL;
record_vote(tk, local, new_leader);
tk->voted_for = new_leader;
set_state(tk, ST_CANDIDATE);
/* some callers may want just to repeat on timeout */
if (reason == OR_AGAIN) {
reason = tk->election_reason;
} else {
tk->election_reason = reason;
}
ticket_broadcast(tk, OP_REQ_VOTE, OP_VOTE_FOR, RLT_SUCCESS, reason);
add_random_delay(tk);
return 0;
}
