479 lines
21 KiB
C
479 lines
21 KiB
C
#ifndef HA_H
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#define HA_H
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/*
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* XCE Controller HA — role management and election (P1).
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*
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* P1-1 audit: the existing create_ssl_context() + iomgr_set_ssl_ctx() path
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* in cluster.c (line 559, set at line 583) covers all controller-to-controller SSL.
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* HA listeners (heartbeat, election probe, replication accept) reuse the same
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* ssl_ctx already installed on c->iomgr.
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* No new TLS infrastructure is needed — XCE runs on a trusted management LAN.
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* Peer identity is validated by host:port match against the --peers candidate list.
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* See design doc Part 5.9 and memory: Persistence & HA Trusted LAN Decision.
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*
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* P1-2: full struct definitions and API.
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* endpoint_t* (primary_ep) is intentionally omitted here — including netio.h
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* would pull in heavy OpenSSL headers and create circular dependency risks.
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* The watchdog (P1-3) will include netio.h directly where it needs endpoint_t.
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*/
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#include <pthread.h>
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#include <semaphore.h>
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#include <stdbool.h>
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#include <stdatomic.h>
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#include <stdint.h>
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#include <time.h>
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#include "config.h" /* XCE_MAXNAME_LEN, MAX_STANDBYS, etc. */
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#include "xce/cluster.h" /* xce_candidate_t */
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#include "zarray.h"
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/* Forward declaration — avoids circular include with cluster_def.h */
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typedef struct cluster_s cluster_t;
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/* ── Inline PRNG for election jitter ───────────────────────── */
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static inline uint64_t xorshift64_next(uint64_t *state)
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{
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uint64_t x = *state;
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x ^= x << 13;
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x ^= x >> 7;
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x ^= x << 17;
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*state = x;
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return x;
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}
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/*
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* ha_seed_jitter: seed the xorshift64 PRNG from /dev/urandom (8 bytes).
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* Falls back to CLOCK_MONOTONIC ^ priority ^ pid if urandom is unavailable.
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* Not inline — contains syscalls (open/read/close/clock_gettime/getpid).
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*/
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void ha_seed_jitter(uint64_t *seed, int my_priority);
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/* ── Role enum ─────────────────────────────────────────────── */
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typedef enum {
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CTRL_PRIMARY = 0,
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CTRL_STANDBY = 1,
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CTRL_INIT = 2, /* Startup: listener open, awaiting heartbeat or election timeout */
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CTRL_ELECTING = 3 /* Running quorum election via OP_requestVote */
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} ctrl_role_t;
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/* ── Election types ────────────────────────────────────────── */
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/*
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* ha_vote_entry_t: per-peer state accumulated by the election candidate.
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* One entry per peer in ha_elect_ctx_t.votes[] (flexible array).
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*/
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typedef struct {
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xce_candidate_t *peer; /* Peer being solicited */
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uint64_t my_term; /* Term sent in OP_requestVote */
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uint64_t my_tag; /* config_tag sent in request */
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uint64_t my_lsn; /* WAL LSN sent in request */
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int vote_granted; /* 1 if peer granted vote */
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int replied; /* 1 if peer replied (granted or denied) */
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uint64_t peer_tag; /* peer's config_tag from reply */
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uint64_t peer_lsn; /* peer's WAL LSN from reply */
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} ha_vote_entry_t;
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/*
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* ha_elect_ctx_t: shared context for one quorum election round.
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* Allocated as: calloc(1, sizeof(*ctx) + (n_peers-1) * sizeof(ctx->votes[0]))
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* Stored in ha_state_t.elect_ctx (void * _Atomic) during election; NULL otherwise.
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*/
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typedef struct {
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int n_peers; /* Total peer count (excluding self) */
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int votes_granted; /* Votes received; starts at 1 (self-vote) */
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int n_replied; /* Number of peers that replied */
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uint64_t max_resp_tag; /* Highest config_tag seen in any reply */
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uint64_t max_resp_lsn; /* Highest WAL LSN seen among max_resp_tag peers */
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int result; /* 1=primary, 0=standby, <0=error */
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int done_posted; /* Guard: non-zero once sem_post(&done) has been called */
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pthread_mutex_t lock; /* Protects votes_granted/n_replied/max_resp_tag/max_resp_lsn/result */
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sem_t done; /* Startup thread blocks; dispatch posts when done */
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ha_vote_entry_t votes[]; /* C99 flexible array: n_peers-1 entries */
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} ha_elect_ctx_t;
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/* ── HA configuration ──────────────────────────────────────── */
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/* Default values used by cluster_init(). Tuned for a LAN with ≤5ms RTT. */
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#define HA_DEFAULT_HEARTBEAT_INTERVAL_MS 3000
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#define HA_DEFAULT_HEARTBEAT_TIMEOUT_MS 10000
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#define HA_DEFAULT_ELECTION_TIMEOUT_MS 2000
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#define HA_DEFAULT_PROBE_CONNECT_TIMEOUT_MS 500
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#define HA_DEFAULT_MAX_PROMOTION_RETRIES 5
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#define HA_DEFAULT_ELECTION_JITTER_MAX_MS 200
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#define HA_DEFAULT_ELECTION_PRIORITY_STEP_MS 500
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typedef struct {
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uint32_t heartbeat_interval_ms; /* Primary heartbeat send interval (min 2000 ms) */
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uint32_t heartbeat_timeout_ms; /* Standby timeout before promoting (>= interval) */
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uint32_t election_timeout_ms; /* Election probe shared deadline (min 500 ms) */
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uint32_t probe_connect_timeout_ms; /* Per-probe TCP connect timeout */
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uint32_t max_promotion_retries; /* Max consecutive failed promotion attempts */
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uint32_t election_jitter_max_ms; /* random jitter added to election timeout (default 200) */
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uint32_t election_priority_step_ms; /* extra ms per priority level (default 500) */
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} ha_config_t;
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typedef struct {
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xce_candidate_t *candidate; /* peer to probe */
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void *ssl_ctx; /* SSL_CTX* (void* to avoid openssl header) */
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uint32_t timeout_ms;
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atomic_int *election_done;
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int got_ack;
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pthread_t thread;
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} probe_ctx_t;
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/* ── HA runtime state (embedded in cluster_t as `ha_state_t ha` in P1-5) ── */
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typedef struct {
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_Atomic uint64_t term; /* Election term — fencing token */
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_Atomic int32_t role; /* Cast to ctrl_role_t at access sites */
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int my_priority; /* Index in --peers list (lower = higher priority) */
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_Atomic uint64_t applied_lsn; /* Standby: last applied WAL LSN */
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char primary_host[XCE_MAXNAME_LEN]; /* Hostname of current primary */
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uint32_t primary_port; /* Port of current primary */
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struct timespec last_heartbeat; /* CLOCK_MONOTONIC timestamp of last heartbeat */
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_Atomic int promotion_failed;
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_Atomic int promotion_retry_count;
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_Atomic int in_catch_up; /* Non-zero while processing historical WAL entries */
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_Atomic int failover_requested; /* Set by SIGUSR1 handler; watchdog executes */
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int hooks_registered; /* Idempotency guard for xce_add_hook calls */
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uint32_t last_received_crc; /* Chained CRC of last received replicated entry */
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ha_config_t config;
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pthread_mutex_t lock; /* Protects primary_host/port + last_heartbeat */
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/* Watchdog thread — started in P1-3 */
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_Atomic int watchdog_stop;
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pthread_t watchdog_thread;
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void *ssl_ctx; /* SSL_CTX* cast; avoids pulling openssl headers here */
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uint64_t jitter_seed; /* xorshift64 PRNG state for election jitter */
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zarray_t *standby_endpoints; /* connected standby controller endpoints for config push */
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/* ── New fields added by ha-config-bootstrap spec ──────── */
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uint64_t voted_for_term; /* Req 9: term of last granted vote */
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char voted_for_name[XCE_MAXNAME_LEN]; /* Req 9: candidate of last granted vote */
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int primary_ctrl_fd; /* Req 6: persistent channel fd (-1 = none) */
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bool defer_config_fetch; /* Req 3: tag=0 node defers fetch to post-election */
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void * _Atomic elect_ctx; /* Req 2: ha_elect_ctx_t* during election; NULL otherwise */
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_Atomic uint64_t last_known_committed_lsn; /* Req 5: from primary heartbeats */
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sem_t heartbeat_seen; /* Req 1: posted by heartbeat handler during CTRL_INIT */
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uint64_t last_known_committed_config_tag; /* Req 8: from primary heartbeats */
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_Atomic uint64_t committed_config_tag; /* Req 8.1: set on quorum ACK */
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} ha_state_t;
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/* ── Public API ────────────────────────────────────────────── */
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/*
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* ha_init: zero-initialise *ha, validate cfg, store config and my_priority.
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* Returns 0 on success, -EINVAL on bad config.
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* Initial role is always CTRL_STANDBY.
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*/
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int ha_init(ha_state_t *ha, const ha_config_t *cfg, int my_priority);
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/*
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* ha_fini: destroy mutex. Watchdog thread join added in P1-3.
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*/
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void ha_fini(ha_state_t *ha);
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/*
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* am_i_primary: stub — priority-0 node is primary.
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* Full election probing added in P1-3.
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*/
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int am_i_primary(cluster_t *c);
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/*
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* ha_promote_to_primary: stub — atomically sets role to PRIMARY.
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* Full promotion sequence (hooks, WAL flush, peer notify) added in P1-3a.
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*/
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int ha_promote_to_primary(cluster_t *c);
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/*
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* ha_demote_to_standby: stub — atomically sets role to STANDBY.
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* Full demotion sequence added in P1-3a.
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*/
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int ha_demote_to_standby(cluster_t *c);
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/* ── Internal promotion/demotion (P1-3a) ───────────────────── */
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/*
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* ha_do_promote: increment term, set role=PRIMARY, reset last_received_crc.
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* No cluster_t dependency — fully testable standalone.
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* Callers: ha_promote_to_primary() (P1-5), watchdog failover path.
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*/
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void ha_do_promote(ha_state_t *ha);
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/*
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* ha_do_demote: set role=STANDBY, reset hooks_registered idempotency guard.
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* Hook disable requires cluster_t and is done in ha_demote_to_standby() (P1-5).
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*/
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void ha_do_demote(ha_state_t *ha);
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/*
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* ha_install_sigusr1: register a SIGUSR1 handler that atomically sets
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* ha->failover_requested. The handler uses only async-signal-safe operations
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* (atomic store on an int-width type — POSIX.1-2017 §2.4.3).
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* Must be called once, before any signal can arrive.
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*/
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void ha_install_sigusr1(ha_state_t *ha);
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/* ── Watchdog thread API (P1-3) ────────────────────────────── */
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/*
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* ha_start_watchdog: spawn the heartbeat watchdog pthread.
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* Must be called after ha_init(). Returns 0 on success, -errno on failure.
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*/
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int ha_start_watchdog(ha_state_t *ha);
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/*
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* ha_stop_watchdog: set watchdog_stop flag and pthread_join the thread.
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* Safe to call if watchdog was never started (thread == 0).
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*/
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void ha_stop_watchdog(ha_state_t *ha);
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/*
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* ha_check_heartbeat_nocluster: test-only entry point — logic is inlined in
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* ha_watchdog_thread() in production. Only compiled under XCE_TESTING.
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*/
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#ifdef XCE_TESTING
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void ha_check_heartbeat_nocluster(ha_state_t *ha);
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#endif
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/* ── Redirect helpers used by join.c ──────────────────────── */
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/*
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* ha_should_redirect: returns 1 if this controller should redirect join
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* requests to the primary.
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* Returns 0 if: (a) role is PRIMARY, or (b) primary_host is empty /
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* primary_port is 0 (no primary known yet — client should retry).
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*/
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int ha_should_redirect(const ha_state_t *ha);
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/*
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* ha_no_primary_known: returns 1 if role is STANDBY and primary_host is
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* empty or primary_port is 0. Caller should reply E_XCE_NOMASTER so the
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* client knows to retry later rather than treating the error as permanent.
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*/
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int ha_no_primary_known(const ha_state_t *ha);
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/*
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* ha_is_primary: returns 1 if ha->role is CTRL_PRIMARY, 0 otherwise.
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* Lock-free. Safe to call from any thread.
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*/
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int ha_is_primary(const ha_state_t *ha);
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/* ha_check_priority_stepdown() deleted — replaced by quorum election (Req 2.1) */
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/*
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* start_heartbeat_listener: start a minimal pre-Phase-2 SSL listener
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* that responds to OP_heartbeat probes. Called after am_i_primary()
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* returns 1. Records tid in c->heartbeat_listener_tid.
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*/
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void start_heartbeat_listener(cluster_t *c);
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/*
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* stop_heartbeat_listener: signal and join the heartbeat listener thread.
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* Must be called before iomgr_init() to free the listening port (EADDRINUSE).
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*/
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void stop_heartbeat_listener(cluster_t *c);
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/*
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* ha_dispatch_gate: role-based operation filter for the vtaskmgr dispatch loop.
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* Returns:
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* 0 — operation is permitted for the current role
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* -E_XCE_NOT_READY — role is CTRL_INIT or CTRL_ELECTING and opcode is not
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* OP_requestVote or OP_probeConfigTag
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* -E_XCE_STANDBY — role is CTRL_STANDBY and opcode is a primary-only op
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* CTRL_PRIMARY always returns 0.
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*/
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int ha_dispatch_gate(ha_state_t *ha, int opcode);
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/* ── HA Config Bootstrap & Term Durability (ha-config-bootstrap spec) ── */
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/*
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* ha_persist_term: write ha-term.bin atomically to {workdir}/ha-term.bin.
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* Uses write + rename for durability (existing pattern in the codebase).
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* Must be called before any vote is granted or term is incremented.
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* If workdir is NULL, the file write is skipped (safe for unit tests).
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*/
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void ha_persist_term(ha_state_t *ha, const char *workdir);
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/*
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* ha_restore_term: read {workdir}/ha-term.bin at startup and restore
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* ha->term and ha->voted_for_* into ha_state_t.
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*
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* On missing file (ENOENT): no-op — term stays 0, voted_for_name stays empty.
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* Returns 0 (safe first-boot path). Req 9.3.
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* On CRC/magic mismatch: log WARN, zero ha->term and ha->voted_for_* for
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* safety and return 0. Req 9.2.
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* On valid file: atomically restore ha->term; copy voted_for_term
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* and voted_for_name. Returns 0. Req 9.2.
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* On unexpected I/O error: return -errno.
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*
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* Must be called after ha_init() and before any election or vote processing.
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* If workdir is NULL, the function is a no-op (safe for unit tests).
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* Requirements: 9.1, 9.2, 9.3.
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*/
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int ha_restore_term(ha_state_t *ha, const char *workdir);
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/*
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* handle_request_vote: process an incoming OP_requestVote RPC.
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* Applies term/voted_for/freshness gate; persists state via ha_persist_term().
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* Returns 1 = vote granted, 0 = vote denied, <0 = error.
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* Requirements: 2.2, 2.3, 2.4, 2.5, 2.6, 9.1
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*/
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int handle_request_vote(ha_state_t *ha,
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uint64_t term,
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const char *candidate_id,
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uint64_t config_tag,
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uint64_t last_lsn,
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uint64_t my_config_tag,
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uint64_t my_last_lsn,
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int in_catch_up_flag);
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/*
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* ha_elect_evaluate_and_signal: evaluate accumulated ha_elect_ctx_t votes.
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* Sets ctx->result (1=primary, 0=standby) and posts ctx->done semaphore.
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* Applies quorum check, fresher-peer yield gate, and config_tag=0 fatal gate.
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* Requirements: 2.1, 2.7, 2.8
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*/
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ctrl_role_t ha_elect_evaluate_and_signal(ha_state_t *ha, ha_elect_ctx_t *ctx);
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/*
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* am_i_primary_quorum: top-level Raft-style quorum election entrypoint.
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* Single-node: self-elects immediately (Req 2.9). Multi-node: spawns per-peer
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* vote-request threads, blocks on ctx->done, retries once on split vote (Req 2.10).
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* Returns CTRL_PRIMARY or CTRL_STANDBY.
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* Requirements: 2.1, 2.9, 2.10, 2.11
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*/
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ctrl_role_t am_i_primary_quorum(ha_state_t *ha,
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int n_peers,
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xce_candidate_t **peers,
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uint64_t my_config_tag,
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uint64_t my_lsn);
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/*
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* handle_request_vote_reply: process an incoming reply to an OP_requestVote RPC.
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*
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* Called by each per-peer vote-request thread once the peer replies (or times out).
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* Updates the entry in ctx->votes[peer_idx] with the reply fields.
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* Increments ctx->votes_granted if vote_granted is non-zero.
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* Increments ctx->n_replied unconditionally.
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* Updates ctx->max_resp_tag / ctx->max_resp_lsn to track the freshest peer seen.
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* When quorum is reached (votes_granted >= quorum) OR all peers have replied
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* (n_replied >= n_peers), calls ha_elect_evaluate_and_signal() to post ctx->done.
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*
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* peer_idx: 0-based index into ctx->votes[] identifying the replying peer.
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* term: term the peer reported in its reply (used for fencing if > ha->term).
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* vote_granted: non-zero if the peer granted the vote, 0 if denied.
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* peer_config_tag: peer's current config_tag at reply time.
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* peer_lsn: peer's current WAL LSN at reply time.
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*
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* Requirements: 2.2, 2.3, 2.4, 2.5, 2.6, 9.1
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*/
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void handle_request_vote_reply(ha_state_t *ha,
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ha_elect_ctx_t *ctx,
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int peer_idx,
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uint64_t term,
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int vote_granted,
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uint64_t peer_config_tag,
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uint64_t peer_lsn);
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/*
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* bootstrap_config_if_needed: pre-election config probe.
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* If the local config tag is 0 and at least one peer has config, sets
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* ha->defer_config_fetch = true and returns without fetching.
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* The actual fetch is deferred to post-election (after a winner is known).
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* Returns 0 on success, -errno on unrecoverable error.
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*/
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int bootstrap_config_if_needed(cluster_t *c);
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/*
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* xce_probe_config_tag: single-RTT OP_probeConfigTag RPC to one peer.
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* Fills *tag_out with the peer's current config_tag on success.
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* Returns 0 on success, -errno on connection/protocol error.
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*/
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int xce_probe_config_tag(const char *host, uint16_t port, uint64_t *tag_out);
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/*
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* ha_wait_for_heartbeat_or_timeout: wait in CTRL_INIT for an incoming heartbeat.
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*
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* Blocks on sem_timedwait(&ha->heartbeat_seen, &deadline) where
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* deadline = now(CLOCK_REALTIME) + election_timeout_ms + xorshift64_jitter
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*
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* Returns CTRL_STANDBY — heartbeat arrived; ha_do_demote() was called
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* (role is now CTRL_STANDBY).
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* Returns CTRL_ELECTING — deadline expired; caller must drive the election.
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*
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* The heartbeat handler posts heartbeat_seen only when role == CTRL_INIT.
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* OPCode_heartbeat is allowed through ha_dispatch_gate() in CTRL_INIT state
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* so that the primary's periodic heartbeat can reach the handler.
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*
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* Requirements: 1.1 (heartbeat → CTRL_STANDBY), 1.2 (timeout → CTRL_ELECTING).
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* Boundary: Controller FSM (ha.c).
|
||
*/
|
||
ctrl_role_t ha_wait_for_heartbeat_or_timeout(ha_state_t *ha);
|
||
|
||
/* ── Task 9.4: EPOLLRDHUP Failover and Heartbeat Timeout (Req 6.2–6.4, 6.8) ─
|
||
|
||
* ha_on_primary_ctrl_fd_rdhup: EPOLLRDHUP event handler.
|
||
* Closes primary_ctrl_fd, transitions to CTRL_ELECTING, truncates WAL to
|
||
* last_known_committed_lsn, fires am_i_primary_quorum (via cluster when non-NULL).
|
||
* Pass c == NULL to skip persist/election (unit test mode).
|
||
*/
|
||
void ha_on_primary_ctrl_fd_rdhup(ha_state_t *ha, cluster_t *c);
|
||
|
||
/*
|
||
* ha_arm_heartbeat_timeout_vtask: start/re-arm the heartbeat watchdog thread.
|
||
* Fires ha_on_primary_ctrl_fd_rdhup after election_timeout_ms + rand_jitter of
|
||
* silence. Calling ha_on_heartbeat_received() resets the deadline.
|
||
*/
|
||
void ha_arm_heartbeat_timeout_vtask(ha_state_t *ha, cluster_t *c);
|
||
|
||
/* ha_on_heartbeat_received: reset the heartbeat deadline (Req 6.3). */
|
||
void ha_on_heartbeat_received(ha_state_t *ha);
|
||
|
||
/* ha_disarm_heartbeat_timeout_vtask: stop the heartbeat watchdog thread. */
|
||
void ha_disarm_heartbeat_timeout_vtask(ha_state_t *ha);
|
||
|
||
/* ── Task 9.2: Persistent Control Channel (Req 6.1) ───────────────────────── */
|
||
|
||
/*
|
||
* ha_find_and_connect_to_primary: three-tier primary discovery and raw TCP connect.
|
||
*
|
||
* Tier 1: ha->voted_for_name non-empty → direct connect to that candidate.
|
||
* Backoff HA_FIND_PRIMARY_T1_BACKOFF_MS; retry HA_FIND_PRIMARY_T1_MAX_RETRIES.
|
||
* Tier 2: probe remaining candidates; follow XCE_ERR_STANDBY redirect.
|
||
* Tier 3: blind scan with 100ms→5s exponential backoff (no exit until success).
|
||
*
|
||
* On success: sets ha->primary_ctrl_fd; when c != NULL, registers fd with
|
||
* c->iomgr.epoll_fd for EPOLLIN|EPOLLRDHUP. Returns fd >= 0.
|
||
* Pass c == NULL to skip iomgr registration (unit test mode).
|
||
* Requirements: 6.1
|
||
*/
|
||
int ha_find_and_connect_to_primary(ha_state_t *ha,
|
||
const ha_config_t *cfg,
|
||
const xce_cluster_config_t *peers,
|
||
cluster_t *c);
|
||
|
||
#define HA_FIND_PRIMARY_T1_MAX_RETRIES 3
|
||
#define HA_FIND_PRIMARY_T1_BACKOFF_MS 200
|
||
#define HA_FIND_PRIMARY_T3_INIT_MS 100
|
||
#define HA_FIND_PRIMARY_T3_MAX_MS 5000
|
||
|
||
/* ── P3-6: Test-only failover shim ────────────────────────────── */
|
||
|
||
#ifdef XCE_TESTING
|
||
/* Test-only shim: demote then re-promote; returns new term.
|
||
* Exercises the manual failover state machine without a live cluster_t.
|
||
* Calls ha_do_demote() then ha_do_promote(); validates role transitions
|
||
* and term monotonicity. See design doc P3-6 and src/docs/persistence-and-ha-design.md.
|
||
*/
|
||
uint64_t ha_trigger_manual_failover_for_test(ha_state_t *ha);
|
||
|
||
/*
|
||
* ha_tcp_connect_hook: test-only seam for TCP connections.
|
||
* When non-NULL, ha_find_and_connect_to_primary() calls this instead of
|
||
* the real connect() path. Returns connected fd on success, -errno on failure.
|
||
*/
|
||
extern int (*ha_tcp_connect_hook)(const char *host, int port);
|
||
#endif
|
||
|
||
#endif /* HA_H */
|