static void ext_prog_failed(struct ticket_config *tk,
int start_election)
{
if (!is_manual(tk)) {
/* Give it to somebody else.
* Just send a VOTE_FOR message, so the
* others can start elections. */
if (leader_and_valid(tk)) {
save_committed_tkt(tk);
reset_ticket(tk);
ticket_write(tk);
if (start_election) {
ticket_broadcast(tk, OP_VOTE_FOR, OP_REQ_VOTE, RLT_SUCCESS, OR_LOCAL_FAIL);
}
}
} else {
/* There is not much we can do now because
* the manual ticket cannot be relocated.
* Just warn the user. */
if (tk->leader == local) {
save_committed_tkt(tk);
reset_ticket(tk);
ticket_write(tk);
log_error("external test failed on the specified machine, cannot acquire a manual ticket");
}
}
}
static int process_REVOKE (
struct ticket_config *tk,
struct booth_site *sender,
struct booth_site *leader,
struct boothc_ticket_msg *msg
)
{
int rv;
if (tk->state == ST_INIT && tk->leader == no_leader) {
/* assume that our ack got lost */
rv = send_msg(OP_ACK, tk, sender, msg);
} else if (tk->leader != sender) {
tk_log_error("%s wants to revoke ticket, "
"but it is not granted there (ignoring)",
site_string(sender));
return 1;
} else if (tk->state != ST_FOLLOWER) {
tk_log_error("unexpected ticket revoke from %s "
"(in state %s) (ignoring)",
site_string(sender),
state_to_string(tk->state));
return 1;
} else {
tk_log_info("%s revokes ticket",
site_string(tk->leader));
save_committed_tkt(tk);
reset_ticket(tk);
set_leader(tk, no_leader);
ticket_write(tk);
rv = send_msg(OP_ACK, tk, sender, msg);
}
return rv;
}
static void start_revoke_ticket(struct ticket_config *tk)
{
tk_log_info("revoking ticket");
save_committed_tkt(tk);
reset_ticket_and_set_no_leader(tk);
ticket_write(tk);
ticket_broadcast(tk, OP_REVOKE, OP_ACK, RLT_SUCCESS, OR_ADMIN);
}
static int process_VOTE_FOR(
struct ticket_config *tk,
struct booth_site *sender,
struct booth_site *leader,
struct boothc_ticket_msg *msg
)
{
if (leader == no_leader) {
/* leader wants to step down? */
if (sender == tk->leader &&
(tk->state == ST_FOLLOWER || tk->state == ST_CANDIDATE)) {
tk_log_info("%s wants to give the ticket away (ticket release)",
site_string(tk->leader));
save_committed_tkt(tk);
reset_ticket(tk);
set_state(tk, ST_FOLLOWER);
if (local->type == SITE) {
ticket_write(tk);
schedule_election(tk, OR_STEPDOWN);
}
} else {
tk_log_info("%s votes for none, ignoring (duplicate ticket release?)",
site_string(sender));
}
return 0;
}
if (tk->state != ST_CANDIDATE) {
/* lost candidate status, somebody rejected our proposal */
tk_log_info("candidate status lost, ignoring VtFr from %s",
site_string(sender));
return 0;
}
if (term_too_low(tk, sender, leader, msg))
return 0;
if (newer_term(tk, sender, leader, msg, 0)) {
clear_election(tk);
}
record_vote(tk, sender, leader);
/* only if all voted can we take the ticket now, otherwise
* wait for timeout in ticket_cron */
if (!tk->acks_expected) {
/* §5.2 */
elections_end(tk);
}
return 0;
}
static void ext_prog_failed(struct ticket_config *tk,
int start_election)
{
/* Give it to somebody else.
* Just send a VOTE_FOR message, so the
* others can start elections. */
if (leader_and_valid(tk)) {
save_committed_tkt(tk);
reset_ticket(tk);
ticket_write(tk);
if (start_election) {
ticket_broadcast(tk, OP_VOTE_FOR, OP_REQ_VOTE, RLT_SUCCESS, OR_LOCAL_FAIL);
}
}
}
static void won_elections(struct ticket_config *tk)
{
set_leader(tk, local);
set_state(tk, ST_LEADER);
set_ticket_expiry(tk, tk->term_duration);
time_reset(&tk->election_end);
tk->voted_for = NULL;
if (is_time_set(&tk->delay_commit) && all_sites_replied(tk)) {
time_reset(&tk->delay_commit);
tk_log_debug("reset delay commit as all sites replied");
}
save_committed_tkt(tk);
ticket_broadcast(tk, OP_HEARTBEAT, OP_ACK, RLT_SUCCESS, 0);
tk->ticket_updated = 0;
}
/* reply to STATUS */
static int process_MY_INDEX (
struct ticket_config *tk,
struct booth_site *sender,
struct booth_site *leader,
struct boothc_ticket_msg *msg
)
{
int i;
int expired;
expired = !msg_term_time(msg);
/* test against the last valid(!) ticket we have */
i = my_last_term(tk) - ntohl(msg->ticket.term);
if (i > 0) {
/* let them know about our newer ticket */
send_msg(OP_MY_INDEX, tk, sender, msg);
if (tk->state == ST_LEADER) {
tk_log_info("sending ticket update to %s",
site_string(sender));
return send_msg(OP_UPDATE, tk, sender, msg);
}
}
/* we have a newer or equal ticket and theirs is expired,
* nothing more to do here */
if (i >= 0 && expired) {
return 0;
}
if (tk->state == ST_LEADER) {
/* we're the leader, thread carefully */
if (expired) {
/* if their ticket is expired,
* nothing more to do */
return 0;
}
if (i < 0) {
/* they have a newer ticket, trouble if we're already leader
* for it */
tk_log_warn("from %s: more up to date ticket at %s",
site_string(sender),
site_string(leader)
);
return leader_handle_newer_ticket(tk, sender, leader, msg);
} else {
/* we have the ticket and we don't care */
return 0;
}
} else if (tk->state == ST_CANDIDATE) {
if (leader == local) {
/* a belated MY_INDEX, we're already trying to get the
* ticket */
return 0;
}
}
/* their ticket is either newer or not expired, don't
* ignore it */
update_ticket_from_msg(tk, sender, msg);
set_leader(tk, leader);
update_ticket_state(tk, sender);
save_committed_tkt(tk);
set_ticket_wakeup(tk);
return 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;
}
