static void log_reacquire_reason(struct ticket_config *tk)
{
int valid;
const char *where_granted = "\0";
char buff[64];
valid = is_time_set(&tk->term_expires) && !is_past(&tk->term_expires);
if (tk->leader == local) {
where_granted = "granted here";
} else {
snprintf(buff, sizeof(buff), "granted to %s",
site_string(tk->leader));
where_granted = buff;
}
if (!valid) {
tk_log_warn("%s, but not valid "
"anymore (will try to reacquire)", where_granted);
}
if (tk->is_granted && tk->leader != local) {
if (tk->leader && tk->leader != no_leader) {
tk_log_error("granted here, but also %s, "
"that's really too bad (will try to reacquire)",
where_granted);
} else {
tk_log_warn("granted here, but we're "
"not recorded as the grantee (will try to reacquire)");
}
}
}
/* is it safe to commit the grant?
* if we didn't hear from all sites on the initial grant, we may
* need to delay the commit
*
* TODO: investigate possibility to devise from history whether a
* missing site could be holding a ticket or not
*/
static int ticket_dangerous(struct ticket_config *tk)
{
int tdiff;
/* we may be invoked often, don't spam the log unnecessarily
*/
static int no_log_delay_msg;
if (!is_time_set(&tk->delay_commit))
return 0;
if (is_past(&tk->delay_commit) || all_sites_replied(tk)) {
if (tk->leader == local) {
tk_log_info("%s, committing to CIB",
is_past(&tk->delay_commit) ?
"ticket delay expired" : "all sites replied");
}
time_reset(&tk->delay_commit);
no_log_delay_msg = 0;
return 0;
}
tdiff = time_left(&tk->delay_commit);
tk_log_debug("delay ticket commit for another " intfmt(tdiff));
if (!no_log_delay_msg) {
tk_log_info("delaying ticket commit to CIB for " intfmt(tdiff));
tk_log_info("(or all sites are reached)");
no_log_delay_msg = 1;
}
return 1;
}
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;
}
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;
}
int list_ticket(char **pdata, unsigned int *len)
{
struct ticket_config *tk;
char timeout_str[64];
char pending_str[64];
char *data, *cp;
int i, alloc;
time_t ts;
*pdata = NULL;
*len = 0;
alloc = booth_conf->ticket_count * (BOOTH_NAME_LEN * 2 + 128);
data = malloc(alloc);
if (!data)
return -ENOMEM;
cp = data;
foreach_ticket(i, tk) {
if (is_time_set(&tk->term_expires)) {
ts = wall_ts(&tk->term_expires);
strftime(timeout_str, sizeof(timeout_str), "%F %T",
localtime(&ts));
} else
strcpy(timeout_str, "INF");
if (tk->leader == local && is_time_set(&tk->delay_commit)
&& !is_past(&tk->delay_commit)) {
ts = wall_ts(&tk->delay_commit);
strcpy(pending_str, " (commit pending until ");
strftime(pending_str + strlen(" (commit pending until "),
sizeof(pending_str) - strlen(" (commit pending until ") - 1,
"%F %T", localtime(&ts));
strcat(pending_str, ")");
} else
*pending_str = '\0';
cp += snprintf(cp,
alloc - (cp - data),
"ticket: %s, leader: %s",
tk->name,
ticket_leader_string(tk));
if (is_owned(tk)) {
cp += snprintf(cp,
alloc - (cp - data),
", expires: %s%s\n",
timeout_str,
pending_str);
} else {
cp += snprintf(cp, alloc - (cp - data), "\n");
}
if (alloc - (cp - data) <= 0) {
free(data);
return -ENOMEM;
}
}
*pdata = data;
*len = cp - data;
return 0;
}
