diff --git a/src/raft.c b/src/raft.c index a267d54..38c75c9 100644 --- a/src/raft.c +++ b/src/raft.c @@ -1,776 +1,782 @@ /* * Copyright (C) 2014 Philipp Marek * * 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 */ #include #include #include #include #include #include "booth.h" #include "transport.h" #include "inline-fn.h" #include "config.h" #include "raft.h" #include "ticket.h" #include "log.h" inline static void clear_election(struct ticket_config *tk) { int i; struct booth_site *site; log_debug("clear election"); tk->votes_received = 0; foreach_node(i, site) tk->votes_for[site->index] = NULL; } inline static void record_vote(struct ticket_config *tk, struct booth_site *who, struct booth_site *vote) { log_debug("site %s votes for %s", site_string(who), site_string(vote)); if (!tk->votes_for[who->index]) { tk->votes_for[who->index] = vote; tk->votes_received |= who->bitmask; } else { if (tk->votes_for[who->index] != vote) log_warn("voted previously (but in same term!) for %s...", site_string(tk->votes_for[who->index])); } } static int cmp_msg_ticket(struct ticket_config *tk, struct boothc_ticket_msg *msg) { if (tk->current_term != ntohl(msg->ticket.term)) { return tk->current_term - ntohl(msg->ticket.term); } return tk->commit_index - ntohl(msg->ticket.leader_commit); } static void update_term_from_msg(struct ticket_config *tk, struct boothc_ticket_msg *msg) { uint32_t i; i = ntohl(msg->ticket.term); /* if we failed to start the election, then accept the term * from the leader * */ if (tk->state == ST_CANDIDATE) { tk->current_term = i; } else { tk->current_term = max(i, tk->current_term); } /* § 5.3 */ i = ntohl(msg->ticket.leader_commit); tk->commit_index = max(i, tk->commit_index); } static void update_ticket_from_msg(struct ticket_config *tk, struct boothc_ticket_msg *msg) { int duration; duration = tk->term_duration; if (msg) duration = min(duration, ntohl(msg->ticket.term_valid_for)); tk->term_expires = time(NULL) + duration; if (msg) { update_term_from_msg(tk, msg); } } static void become_follower(struct ticket_config *tk, struct boothc_ticket_msg *msg) { update_ticket_from_msg(tk, msg); tk->state = ST_FOLLOWER; } struct booth_site *majority_votes(struct ticket_config *tk) { int i, n; struct booth_site *v; int count[MAX_NODES] = { 0, }; for(i=0; isite_count; i++) { v = tk->votes_for[i]; if (!v) continue; n = v->index; count[n]++; log_debug("Majority: %d %s wants %d %s => %d", i, site_string(&booth_conf->site[i]), n, site_string(v), count[n]); if (count[n]*2 <= booth_conf->site_count) continue; log_debug("Majority reached: %d of %d for %s", count[n], booth_conf->site_count, site_string(v)); return v; } return NULL; } static int all_voted(struct ticket_config *tk) { int i, cnt = 0; for(i=0; isite_count; i++) { if (tk->votes_for[i]) { cnt++; } } return (cnt == booth_conf->site_count); } static int newer_term(struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg, int in_election) { uint32_t term; term = ntohl(msg->ticket.term); /* §5.1 */ if (term > tk->current_term) { tk->state = ST_FOLLOWER; if (!in_election) { tk->leader = leader; log_debug("from %s: higher term %d vs. %d, following %s", site_string(sender), term, tk->current_term, ticket_leader_string(tk)); } else { tk->leader = no_leader; log_debug("from %s: higher term %d vs. %d (election)", site_string(sender), term, tk->current_term); } tk->term_expires = time(NULL) + tk->term_duration; tk->current_term = term; return 1; } return 0; } static int term_too_low(struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg) { uint32_t term; term = ntohl(msg->ticket.term); /* §5.1 */ if (term < tk->current_term) { log_info("sending reject to %s, its term too low " "(%d vs. %d)", site_string(leader), term, tk->current_term ); send_reject(sender, tk, RLT_TERM_OUTDATED); return 1; } return 0; } /* For follower. */ static int answer_HEARTBEAT ( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { uint32_t term; struct boothc_ticket_msg omsg; term = ntohl(msg->ticket.term); log_debug("leader: %s, have %s; term %d vs %d", site_string(leader), ticket_leader_string(tk), term, tk->current_term); /* if we're candidate, it may be that we got a heartbeat from * a legitimate leader, so don't ignore a lower term */ if (tk->state != ST_CANDIDATE && term < tk->current_term) { log_info("ignoring lower term %d vs. %d, from %s", term, tk->current_term, ticket_leader_string(tk)); return 0; } /* Needed? */ newer_term(tk, sender, leader, msg, 0); become_follower(tk, msg); /* Racy??? */ assert(sender == leader || !leader); tk->leader = leader; /* Ack the heartbeat (we comply). */ init_ticket_msg(&omsg, OP_HEARTBEAT, RLT_SUCCESS, tk); return booth_udp_send(sender, &omsg, sizeof(omsg)); } static int process_UPDATE ( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { uint32_t term; term = ntohl(msg->ticket.term); log_debug("leader: %s, have %s; term %d vs %d", site_string(leader), ticket_leader_string(tk), term, tk->current_term); /* No reject. (?) */ if (term < tk->current_term) { log_info("ignoring lower term %d vs. %d, from %s", term, tk->current_term, ticket_leader_string(tk)); return 0; } update_ticket_from_msg(tk, msg); ticket_write(tk); /* run ticket_cron if the ticket expires */ set_ticket_wakeup(tk); return 0; } static int process_REVOKE ( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { if (tk->leader != sender) { log_error("from %s: non-leader wants to revoke ticket %s (ignoring)", site_string(sender), tk->name); return 1; } else if (tk->state != ST_FOLLOWER) { log_error("from %s: unexpected ticket %s revoke in state %s (ignoring)", site_string(sender), state_to_string(tk->state), tk->name); return 1; } else { log_info("from %s: leader revokes ticket %s", site_string(sender), tk->name); reset_ticket(tk); ticket_write(tk); } return 0; } /* update the ticket on the leader, write it to the CIB, and send out the update message to others with the new expiry time */ static int leader_update_ticket(struct ticket_config *tk) { struct boothc_ticket_msg msg; tk->term_expires = time(NULL) + tk->term_duration; tk->retry_number = 0; ticket_write(tk); set_ticket_wakeup(tk); init_ticket_msg(&msg, OP_UPDATE, RLT_SUCCESS, tk); return transport()->broadcast(&msg, sizeof(msg)); } /* For leader. */ static int process_HEARTBEAT( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { uint32_t term; term = ntohl(msg->ticket.term); if (newer_term(tk, sender, leader, msg, 0)) { /* unexpected higher term */ log_warn("got higher term from %s (%d vs. %d)", site_string(sender), term, tk->current_term); return 0; } /* Don't send a reject. */ if (term < tk->current_term) { /* Doesn't know what he's talking about - perhaps * doesn't receive our packets? */ log_warn("from %s: unexpected " "term %d instead of %d (ignoring)", site_string(sender), term, tk->current_term); return 0; } if (term == tk->current_term && leader == tk->leader) { /* got an ack! */ tk->acks_received |= sender->bitmask; log_debug("got heartbeat ACK from %s, %d/%d agree.", site_string(sender), count_bits(tk->acks_received), booth_conf->site_count); if (majority_of_bits(tk, tk->acks_received)) { /* OK, at least half of the nodes are reachable; * Update the ticket and send update messages out */ if( !tk->majority_acks_received ) { /* Write the ticket to the CIB and set the next * wakeup time (but do that only once) */ tk->majority_acks_received = 1; return leader_update_ticket(tk); } } } return 0; } void leader_elected( struct ticket_config *tk, struct booth_site *new_leader ) { if (new_leader) { tk->leader = new_leader; tk->term_expires = time(NULL) + tk->term_duration; tk->election_end = 0; tk->voted_for = NULL; if (new_leader == local) { tk->commit_index++; tk->state = ST_LEADER; send_heartbeat(tk); - } else + ticket_activate_timeout(tk); + } else { become_follower(tk, NULL); + set_ticket_wakeup(tk); + } } } static int process_VOTE_FOR( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { 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); if (tk->state != ST_CANDIDATE) { /* lost candidate status, somebody rejected our proposal */ return 0; } /* only if all voted can we take the ticket now, otherwise * wait for timeout in ticket_cron */ if (all_voted(tk)) { /* §5.2 */ leader_elected(tk, majority_votes(tk)); - set_ticket_wakeup(tk); } return 0; } static int process_REJECTED( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { uint32_t rv; rv = ntohl(msg->header.result); if (tk->state == ST_CANDIDATE && rv == RLT_TERM_OUTDATED) { log_warn("from %s: ticket %s outdated (term %d), following %s", site_string(sender), tk->name, ntohl(msg->ticket.term), site_string(leader) ); tk->leader = leader; become_follower(tk, msg); return 0; } if (tk->state == ST_CANDIDATE && rv == RLT_TERM_STILL_VALID) { log_warn("from %s: there's a leader I didn't see: %s, following", site_string(sender), site_string(leader)); tk->leader = leader; become_follower(tk, msg); return 0; } log_warn("from %s: in state %s, got %s (unexpected reject)", site_string(sender), state_to_string(tk->state), state_to_string(rv)); tk->leader = leader; become_follower(tk, msg); return 0; } static int send_ticket ( int cmd, struct ticket_config *tk, struct booth_site *to_site ) { struct boothc_ticket_msg omsg; init_ticket_msg(&omsg, cmd, RLT_SUCCESS, tk); return booth_udp_send(to_site, &omsg, sizeof(omsg)); } /* §5.2 */ static int answer_REQ_VOTE( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { uint32_t term; int valid; struct boothc_ticket_msg omsg; term = ntohl(msg->ticket.term); /* Important: Ignore duplicated packets! */ valid = term_time_left(tk); if (valid && term == tk->current_term && sender == tk->leader) { log_debug("Duplicate OP_VOTE_FOR ignored."); return 0; } if (valid) { log_warn("no election allowed for %s, term still valid for %d", tk->name, valid); return send_reject(sender, tk, RLT_TERM_STILL_VALID); } if (term_too_low(tk, sender, leader, msg)) return 0; /* if it's a newer term or ... */ if (newer_term(tk, sender, leader, msg, 1)) { clear_election(tk); goto vote_for_sender; } /* ... we didn't vote yet, then vote for the sender */ /* §5.2, §5.4 */ if (!tk->voted_for) { vote_for_sender: tk->voted_for = sender; record_vote(tk, sender, leader); } init_ticket_msg(&omsg, OP_VOTE_FOR, RLT_SUCCESS, tk); omsg.ticket.leader = htonl(get_node_id(tk->voted_for)); return booth_udp_send(sender, &omsg, sizeof(omsg)); } int new_election(struct ticket_config *tk, struct booth_site *preference, int update_term) { struct booth_site *new_leader; time_t now; time(&now); log_debug("start new election?, now=%" PRIi64 ", end %" PRIi64, (int64_t)now, (int64_t)(tk->election_end)); if (now <= tk->election_end) return 0; /* §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). */ if (update_term) tk->current_term++; tk->term_expires = 0; tk->election_end = now + tk->term_duration; log_debug("start new election! term=%d, until %" PRIi64, tk->current_term, (int64_t)tk->election_end); 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; tk->state = ST_CANDIDATE; ticket_broadcast(tk, OP_REQ_VOTE, RLT_SUCCESS); ticket_activate_timeout(tk); return 0; } /* we were a leader and somebody says that they have a more up * to date ticket * there was probably connectivity loss * tricky */ static int leader_handle_newer_ticket( struct ticket_config *tk, struct booth_site *sender, struct booth_site *leader, struct boothc_ticket_msg *msg ) { if (leader == no_leader || !leader || leader == local) { /* at least nobody else owns the ticket */ /* it is not kosher to update from their copy, but since * they don't own the ticket, nothing bad can happen */ update_term_from_msg(tk, msg); /* get the ticket again, if we can */ return acquire_ticket(tk); } /* eek, two leaders, split brain */ /* normally shouldn't happen; run election */ log_error("from %s: ticket %s at %s! (disowning ticket)", site_string(sender), tk->name, site_string(leader) ); disown_ticket(tk); ticket_write(tk); log_error("Two ticket owners! Possible bug. Please report at https://github.com/ClusterLabs/booth/issues/new."); return acquire_ticket(tk); } /* 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 rv; if (!msg->ticket.term_valid_for) { /* ticket not valid */ return 0; } i = cmp_msg_ticket(tk, msg); if (i > 0) { /* let them know about our newer ticket */ send_ticket(OP_MY_INDEX, tk, sender); if (tk->state == ST_LEADER) return send_ticket(OP_UPDATE, tk, sender); } if (i == 0) { return 0; } /* they have a newer ticket, trouble if we're already leader * for it */ if (tk->state == ST_LEADER) { log_warn("from %s: more uptodate ticket %s at %s", site_string(sender), tk->name, site_string(leader) ); return leader_handle_newer_ticket(tk, sender, leader, msg); } update_ticket_from_msg(tk, msg); + tk->leader = leader; if (leader == local) { /* if we were the leader but we rebooted in the * meantime; try to get the ticket again */ - return acquire_ticket(tk); + tk->state = ST_LEADER; + rv = send_heartbeat(tk); + ticket_activate_timeout(tk); + return rv; } else { - tk->leader = leader; tk->state = (!leader || leader == no_leader) ? ST_INIT : ST_FOLLOWER; } return 0; } int raft_answer( struct ticket_config *tk, struct booth_site *from, struct booth_site *leader, struct boothc_ticket_msg *msg ) { int cmd; int rv; rv = 0; cmd = ntohl(msg->header.cmd); R(tk); log_debug("got message %s from %s", state_to_string(cmd), site_string(from)); switch (cmd) { case OP_REQ_VOTE: rv = answer_REQ_VOTE(tk, from, leader, msg); break; case OP_VOTE_FOR: rv = process_VOTE_FOR(tk, from, leader, msg); break; case OP_HEARTBEAT: if (tk->leader == local && tk->state == ST_LEADER) rv = process_HEARTBEAT(tk, from, leader, msg); else if (tk->leader != local && (tk->state == ST_FOLLOWER || tk->state == ST_CANDIDATE)) rv = answer_HEARTBEAT(tk, from, leader, msg); else { log_warn("unexpected message %s, from %s", state_to_string(cmd), site_string(from)); rv = -EINVAL; } break; case OP_UPDATE: if (tk->leader != local && tk->state == ST_FOLLOWER) { rv = process_UPDATE(tk, from, leader, msg); } else { log_warn("unexpected message %s, from %s", state_to_string(cmd), site_string(from)); rv = -EINVAL; } break; case OP_REJECTED: rv = process_REJECTED(tk, from, leader, msg); break; case OP_REVOKE: rv = process_REVOKE(tk, from, leader, msg); break; case OP_MY_INDEX: rv = process_MY_INDEX(tk, from, leader, msg); break; case OP_STATUS: rv = send_ticket(OP_MY_INDEX, tk, from); break; default: log_error("unknown message %s, from %s", state_to_string(cmd), site_string(from)); rv = -EINVAL; } R(tk); return rv; } diff --git a/src/ticket.c b/src/ticket.c index 18efa3e..c69dcb4 100644 --- a/src/ticket.c +++ b/src/ticket.c @@ -1,661 +1,659 @@ /* * Copyright (C) 2011 Jiaju Zhang * Copyright (C) 2013-2014 Philipp Marek * * 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 */ #include #include #include #include #include #include #include #include #include "ticket.h" #include "config.h" #include "pacemaker.h" #include "inline-fn.h" #include "log.h" #include "booth.h" #include "raft.h" #include "handler.h" #define TK_LINE 256 /* Untrusted input, must fit (incl. \0) in a buffer of max chars. */ int check_max_len_valid(const char *s, int max) { int i; for(i=0; iticket_count; i++) { if (!strcmp(booth_conf->ticket[i].name, ticket)) { if (found) *found = booth_conf->ticket + i; return 1; } } return 0; } int check_ticket(char *ticket, struct ticket_config **found) { if (found) *found = NULL; if (!booth_conf) return 0; if (!check_max_len_valid(ticket, sizeof(booth_conf->ticket[0].name))) return 0; return find_ticket_by_name(ticket, found); } int check_site(char *site, int *is_local) { struct booth_site *node; if (!check_max_len_valid(site, sizeof(node->addr_string))) return 0; if (find_site_by_name(site, &node, 0)) { *is_local = node->local; return 1; } return 0; } #if 0 /** Find out what others think about this ticket. * * If we're a SITE, we can ask (and have to tell) Pacemaker. * An ARBITRATOR can only ask others. */ static int ticket_send_catchup(struct ticket_config *tk) { int i, rv = 0; struct booth_site *site; struct boothc_ticket_msg msg; foreach_node(i, site) { if (!site->local) { init_ticket_msg(&msg, CMD_CATCHUP, RLT_SUCCESS, tk); log_debug("attempting catchup from %s", site->addr_string); rv = booth_udp_send(site, &msg, sizeof(msg)); } } ticket_activate_timeout(tk); return rv; } #endif int ticket_write(struct ticket_config *tk) { if (local->type != SITE) return -EINVAL; disown_if_expired(tk); if (tk->leader == local) { pcmk_handler.grant_ticket(tk); } else { pcmk_handler.revoke_ticket(tk); } return 0; } /* Ask an external program whether getting the ticket * makes sense. * Eg. if the services have a failcount of INFINITY, * we can't serve here anyway. */ int acquire_ticket(struct ticket_config *tk) { int rv; if (!tk->ext_verifier) goto get_it; rv = run_handler(tk, tk->ext_verifier, 1); if (rv) { log_warn("we are not allowed to acquire ticket %s", tk->name); /* Give it to somebody else. * Just send a commit message, as the * others couldn't help anyway. */ if (leader_and_valid(tk)) { disown_ticket(tk); #if 0 tk->proposed_owner = NULL; /* Just go one further - others may easily override. */ tk->new_ballot++; ticket_broadcast_proposed_state(tk, OP_COMMITTED); tk->state = ST_STABLE; #endif ticket_broadcast(tk, OP_VOTE_FOR, RLT_SUCCESS); } return rv; } get_it: rv = new_election(tk, local, 1); return rv; } /** Try to get the ticket for the local site. * */ int do_grant_ticket(struct ticket_config *tk) { int rv; if (tk->leader == local) return RLT_SUCCESS; if (is_owned(tk)) return RLT_OVERGRANT; rv = acquire_ticket(tk); return rv; } /** Ticket revoke. * Only to be started from the leader. */ int do_revoke_ticket(struct ticket_config *tk) { log_info("revoking ticket %s", tk->name); reset_ticket(tk); ticket_write(tk); return ticket_broadcast(tk, OP_REVOKE, RLT_SUCCESS); } int list_ticket(char **pdata, unsigned int *len) { struct ticket_config *tk; char timeout_str[64]; char *data, *cp; int i, alloc; *pdata = NULL; *len = 0; alloc = 256 + booth_conf->ticket_count * (BOOTH_NAME_LEN * 2 + 128); data = malloc(alloc); if (!data) return -ENOMEM; cp = data; foreach_ticket(i, tk) { if (tk->term_expires != 0) strftime(timeout_str, sizeof(timeout_str), "%F %T", localtime(&tk->term_expires)); else strcpy(timeout_str, "INF"); cp += sprintf(cp, "ticket: %s, leader: %s, expires: %s, commit: %d\n", tk->name, ticket_leader_string(tk), timeout_str, tk->commit_index); *len = cp - data; assert(*len < alloc); } *pdata = data; return 0; } void reset_ticket(struct ticket_config *tk) { disown_ticket(tk); tk->current_term = 0; tk->commit_index = 0; tk->state = ST_INIT; } int setup_ticket(void) { struct ticket_config *tk; int i; foreach_ticket(i, tk) { reset_ticket(tk); if (local->type == SITE) { pcmk_handler.load_ticket(tk); if (time(NULL) >= tk->term_expires) { reset_ticket(tk); ticket_write(tk); } } - /* we'll start election if the ticket seems to be - * uptodate + /* if the ticket is uptodate and belongs to us, try with + * the heartbeat */ if (tk->is_granted && tk->leader == local) { - tk->state = ST_FOLLOWER; + tk->state = ST_LEADER; + send_heartbeat(tk); + ticket_activate_timeout(tk); } else { /* otherwise, query status */ ticket_broadcast(tk, OP_STATUS, RLT_SUCCESS); } } return 0; } int ticket_answer_list(int fd, struct boothc_ticket_msg *msg) { char *data; int olen, rv; struct boothc_header hdr; rv = list_ticket(&data, &olen); if (rv < 0) return rv; init_header(&hdr, CMR_LIST, RLT_SUCCESS, sizeof(hdr) + olen); return send_header_plus(fd, &hdr, data, olen); } int ticket_answer_grant(int fd, struct boothc_ticket_msg *msg) { int rv; struct ticket_config *tk; if (!check_ticket(msg->ticket.id, &tk)) { log_warn("client asked to grant unknown ticket %s", msg->ticket.id); rv = RLT_INVALID_ARG; goto reply; } if (is_owned(tk)) { log_warn("client wants to grant an (already granted!) ticket %s", msg->ticket.id); rv = RLT_OVERGRANT; goto reply; } rv = do_grant_ticket(tk); reply: init_header(&msg->header, CMR_GRANT, rv ?: RLT_ASYNC, sizeof(*msg)); return send_ticket_msg(fd, msg); } int ticket_answer_revoke(int fd, struct boothc_ticket_msg *msg) { int rv; struct ticket_config *tk; if (!check_ticket(msg->ticket.id, &tk)) { log_warn("client wants to revoke an unknown ticket %s", msg->ticket.id); rv = RLT_INVALID_ARG; goto reply; } if (!is_owned(tk)) { log_info("client wants to revoke a free ticket %s", msg->ticket.id); /* Return a different result code? */ rv = RLT_SUCCESS; goto reply; } if (tk->leader != local) { log_info("we do not own the ticket %s, " "redirect to leader %s", msg->ticket.id, ticket_leader_string(tk)); rv = RLT_REDIRECT; goto reply; } rv = do_revoke_ticket(tk); if (rv == 0) rv = RLT_ASYNC; reply: init_ticket_msg(msg, CMR_REVOKE, rv, tk); return send_ticket_msg(fd, msg); } int ticket_broadcast(struct ticket_config *tk, cmd_request_t cmd, cmd_result_t res) { struct boothc_ticket_msg msg; init_ticket_msg(&msg, cmd, res, tk); log_debug("broadcasting '%s' for ticket %s (term=%d, valid=%d)", state_to_string(cmd), tk->name, ntohl(msg.ticket.term), ntohl(msg.ticket.term_valid_for)); return transport()->broadcast(&msg, sizeof(msg)); } static void ticket_lost(struct ticket_config *tk) { log_warn("LOST ticket: %s no longer at %s", tk->name, ticket_leader_string(tk)); /* Couldn't renew in time - ticket lost. */ disown_ticket(tk); /* New vote round; §5.2 */ if (local->type == SITE) { new_election(tk, NULL, 1); } ticket_write(tk); } static void ticket_cron(struct ticket_config *tk) { time_t now; int vote_cnt; struct booth_site *new_leader; now = time(NULL); R(tk); /* Has an owner, has an expiry date, and expiry date in the past? * Losing the ticket must happen in _every_ state. */ if (tk->term_expires && is_owned(tk) && now >= tk->term_expires) { ticket_lost(tk); return; } R(tk); switch(tk->state) { case ST_INIT: /* init state, nothing to do */ break; case ST_FOLLOWER: - /* in case we got restarted and this ticket belongs to - * us */ - if (tk->is_granted && tk->leader == local) { - acquire_ticket(tk); - } + /* nothing here either, ticket loss is caught earlier + * */ break; case ST_CANDIDATE: /* §5.2 */ /* not everybody answered, but if we have majority... */ new_leader = majority_votes(tk); if (new_leader) { leader_elected(tk, new_leader); - set_ticket_wakeup(tk); } else if (now > tk->election_end) { /* This is previous election timed out */ new_election(tk, NULL, 0); } break; case ST_LEADER: /* we get here after we broadcasted a heartbeat; * by this time all sites should've acked the heartbeat */ vote_cnt = count_bits(tk->acks_received) - 1; if ((vote_cnt+1) < booth_conf->site_count) { if (!majority_of_bits(tk, tk->acks_received)) { tk->retry_number ++; if (!vote_cnt) { log_warn("no answers to heartbeat for ticket %s on try #%d, " "we are alone", tk->name, tk->retry_number); } else { log_warn("not enough answers to heartbeat for ticket %s on try #%d: " "only got %d answers", tk->name, tk->retry_number, vote_cnt); } /* Don't give up, though - there's still some time until leadership is lost. */ } } send_heartbeat(tk); if (tk->retry_number < tk->retries) { ticket_activate_timeout(tk); } else { set_ticket_wakeup(tk); } break; default: break; } R(tk); } void process_tickets(void) { struct ticket_config *tk; int i; struct timeval now; float sec_until; gettimeofday(&now, NULL); foreach_ticket(i, tk) { sec_until = timeval_to_float(tk->next_cron) - timeval_to_float(now); if (0) log_debug("ticket %s next cron %" PRIx64 ".%03d, " "now %" PRIx64 "%03d, in %f", tk->name, (uint64_t)tk->next_cron.tv_sec, timeval_msec(tk->next_cron), (uint64_t)now.tv_sec, timeval_msec(now), sec_until); if (sec_until > 0.0) continue; log_debug("ticket cron: doing %s", tk->name); /* Set next value, handler may override. * This should already be handled via the state logic; * but to be on the safe side the renew repetition is * duplicated here, too. */ set_ticket_wakeup(tk); ticket_cron(tk); } } void tickets_log_info(void) { struct ticket_config *tk; int i; foreach_ticket(i, tk) { log_info("Ticket %s: state '%s' " "commit index %d " "leader %s " "expires %-24.24s", tk->name, state_to_string(tk->state), tk->commit_index, ticket_leader_string(tk), ctime(&tk->term_expires)); } } /* UDP message receiver. */ int message_recv(struct boothc_ticket_msg *msg, int msglen) { uint32_t from; struct booth_site *source; struct ticket_config *tk; struct booth_site *leader; uint32_t leader_u; if (check_boothc_header(&msg->header, sizeof(*msg)) < 0 || msglen != sizeof(*msg)) { log_error("message receive error"); return -1; } from = ntohl(msg->header.from); if (!find_site_by_id(from, &source) || !source) { log_error("unknown sender: %08x", from); return -1; } if (!check_ticket(msg->ticket.id, &tk)) { log_warn("got invalid ticket name %s from %s", msg->ticket.id, site_string(source)); return -EINVAL; } leader_u = ntohl(msg->ticket.leader); if (!find_site_by_id(leader_u, &leader)) { log_error("Message with unknown owner %u received", leader_u); return -EINVAL; } return raft_answer(tk, source, leader, msg); } void set_ticket_wakeup(struct ticket_config *tk) { struct timeval tv, now; /* At least every hour, perhaps sooner. */ ticket_next_cron_in(tk, 3600); switch (tk->state) { case ST_LEADER: assert(tk->leader == local); gettimeofday(&now, NULL); tv = now; tv.tv_sec = next_vote_starts_at(tk); /* If timestamp is in the past, look again in one second. */ if (timeval_compare(tv, now) <= 0) tv.tv_sec = now.tv_sec + 1; ticket_next_cron_at(tk, tv); break; case ST_CANDIDATE: assert(tk->election_end); ticket_next_cron_at_coarse(tk, tk->election_end); break; case ST_INIT: case ST_FOLLOWER: /* If there is (or should be) some owner, check on it later on. * If no one is interested - don't care. */ if (is_owned(tk) && (local->type == SITE)) ticket_next_cron_at_coarse(tk, tk->term_expires + tk->acquire_after); break; default: log_error("unknown ticket state: %d", tk->state); } } /* Given a state (in host byte order), return a human-readable (char*). * An array is used so that multiple states can be printed in a single printf(). */ char *state_to_string(uint32_t state_ho) { union mu { cmd_request_t s; char c[5]; }; static union mu cache[6] = { { 0 } }, *cur; static int current = 0; current ++; if (current >= sizeof(cache)/sizeof(cache[0])) current = 0; cur = cache + current; cur->s = htonl(state_ho); /* Shouldn't be necessary, union array is initialized with zeroes, and * these bytes never get written. */ cur->c[4] = 0; return cur->c; } int send_reject(struct booth_site *dest, struct ticket_config *tk, cmd_result_t code) { struct boothc_ticket_msg msg; init_ticket_msg(&msg, OP_REJECTED, code, tk); return booth_udp_send(dest, &msg, sizeof(msg)); }