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https://github.com/urbit/shrub.git
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1805 lines
44 KiB
C
1805 lines
44 KiB
C
/* v/raft.c
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**
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** This file is in the public domain.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <uv.h>
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#include "all.h"
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#include "v/vere.h"
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/* u3_rent: Log entry wire format.
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*/
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typedef struct {
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c3_w tem_w; // Log entry term
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c3_w typ_w; // Entry type, %ra|%ov
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c3_w len_w; // Word length of blob
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c3_w* bob_w; // Blob
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} u3_rent;
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/* u3_rmsg: Raft RPC wire format.
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*/
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typedef struct _u3_rmsg {
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c3_w ver_w; // version, mug('a')...
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c3_d len_d; // Words in message
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c3_w tem_w; // Current term
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c3_w typ_w; // %apen|%revo|%rasp
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union {
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struct {
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c3_w suc_w; // Request successful
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} rasp;
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struct {
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c3_d lai_d; // Last log index
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c3_w lat_w; // Last log term
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c3_w nam_w; // Name word length
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c3_c* nam_c; // Requestor name
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union {
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struct {
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c3_d cit_d; // Leader commitIndex
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c3_d ent_d; // Number of entries
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u3_rent* ent_u; // Entries
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} apen;
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};
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} rest;
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};
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} u3_rmsg;
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static ssize_t _raft_rmsg_read(const u3_rbuf* buf_u, u3_rmsg* msg_u);
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static void _raft_rmsg_send(u3_rcon* ron_u, const u3_rmsg* msg_u);
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static void _raft_rmsg_free(u3_rmsg* msg_u);
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static void _raft_conn_dead(u3_rcon* ron_u);
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static u3_noun _raft_remove_run(u3_rcon* ron_u);
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static void _raft_send_rasp(u3_rcon* ron_u, c3_t suc_t);
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static void _raft_rreq_free(u3_rreq* req_u);
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static void _raft_time_cb(uv_timer_t* tim_u);
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static void
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_raft_rnam_free(u3_rnam* nam_u)
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{
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if ( nam_u ) {
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c3_assert(0 == nam_u->ron_u);
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c3_assert(0 == nam_u->nex_u);
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free(nam_u->str_c);
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free(nam_u->nam_c);
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free(nam_u->por_c);
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}
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free(nam_u);
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}
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/* _raft_readname(): parse a raft host:port peer name.
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*/
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static u3_rnam*
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_raft_readname(const c3_c* str_c, c3_w siz_w)
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{
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u3_rnam* nam_u = calloc(1, sizeof(*nam_u));
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c3_c* col_c;
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c3_w nam_w;
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nam_u->str_c = c3_malloc(siz_w + 1);
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strncpy(nam_u->str_c, str_c, siz_w + 1);
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nam_u->str_c[siz_w] = '\0';
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if ( 0 == (col_c = strchr(nam_u->str_c, ':')) ) {
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uL(fprintf(uH, "raft: invalid name %s\n", nam_u->str_c));
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_raft_rnam_free(nam_u);
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nam_u = 0;
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}
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else {
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nam_w = col_c - nam_u->str_c + 1;
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nam_u->nam_c = c3_malloc(nam_w);
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strncpy(nam_u->nam_c, nam_u->str_c, nam_w + 1);
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*(nam_u->nam_c + nam_w) = 0;
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nam_u->por_c = strdup(col_c + 1);
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}
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return nam_u;
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}
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/* u3_raft_readopt(): parse a string into a list of raft peers.
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*/
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u3_rnam*
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u3_raft_readopt(const c3_c* arg_c, c3_c* our_c, c3_s oup_s)
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{
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u3_rnam* nam_u;
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u3_rnam* nex_u;
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c3_c* com_c;
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if ( 0 == (com_c = strchr(arg_c, ',')) ) {
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nam_u = _raft_readname(arg_c, strlen(arg_c));
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nex_u = 0;
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}
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else {
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nam_u = _raft_readname(arg_c, com_c - arg_c);
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nex_u = u3_raft_readopt(com_c + 1, our_c, oup_s);
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}
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if ( nam_u ) {
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c3_c* end_c;
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c3_w por_w = strtoul(nam_u->por_c, &end_c, 10);
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if ( '\0' == *nam_u->por_c || '\0' != *end_c || por_w >= 65536 ) {
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uL(fprintf(uH, "raft: invalid port %s\n", nam_u->por_c));
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_raft_rnam_free(nam_u);
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_raft_rnam_free(nex_u);
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nam_u = 0;
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}
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else {
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if ( oup_s == por_w && 0 == strcmp(our_c, nam_u->nam_c) ) {
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_raft_rnam_free(nam_u);
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nam_u = nex_u;
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}
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else nam_u->nex_u = nex_u;
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}
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}
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else _raft_rnam_free(nex_u);
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return nam_u;
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}
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/* _raft_alloc(): libuv-style allocator for raft.
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*/
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static void
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_raft_alloc(uv_handle_t* had_u,
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size_t len_i,
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uv_buf_t* buf
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)
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{
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void* ptr_v = c3_malloc(len_i);
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*buf = uv_buf_init(ptr_v, len_i);
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}
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/* _raft_election_rand(): election timeout.
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*/
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static c3_w
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_raft_election_rand()
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{
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c3_w ret = (1.0 + (float) rand() / RAND_MAX) * 150;
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//uL(fprintf(uH, "raft: timeout %d\n", ret));
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return ret;
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}
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/* _raft_promote(): actions on raft leader election.
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*/
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static void
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_raft_promote(u3_raft* raf_u)
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{
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if ( u3_raty_lead == raf_u->typ_e ) {
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uL(fprintf(uH, "raft: double promote; ignoring\n"));
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}
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else {
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c3_i sas_i;
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if ( 1 == raf_u->pop_w ) {
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uL(fprintf(uH, "raft: -> lead\n"));
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raf_u->typ_e = u3_raty_lead;
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// TODO boot in multiuser mode
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u3_sist_boot();
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if ( c3n == u3_Host.ops_u.bat ) {
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u3_lo_lead();
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}
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}
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else {
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c3_assert(u3_raty_cand == raf_u->typ_e);
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uL(fprintf(uH, "raft: cand -> lead\n"));
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raf_u->typ_e = u3_raty_lead;
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sas_i = uv_timer_stop(&raf_u->tim_u);
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c3_assert(0 == sas_i);
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sas_i = uv_timer_start(&raf_u->tim_u, _raft_time_cb, 50, 50);
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c3_assert(0 == sas_i);
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}
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}
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}
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/* _raft_demote(): demote to follower.
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*/
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static void
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_raft_demote(u3_raft* raf_u)
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{
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u3_raty typ_e = raf_u->typ_e;
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raf_u->vog_c = 0;
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u3_sist_nil("vote");
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raf_u->vot_w = 0;
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raf_u->typ_e = u3_raty_foll;
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if ( u3_raty_lead == typ_e ) {
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c3_i sas_i;
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uL(fprintf(uH, "raft: lead -> foll\n"));
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sas_i = uv_timer_stop(&raf_u->tim_u);
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c3_assert(0 == sas_i);
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sas_i = uv_timer_start(&raf_u->tim_u, _raft_time_cb,
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_raft_election_rand(), 0);
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c3_assert(0 == sas_i);
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// TODO dump not-yet-committed events
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}
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else {
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c3_assert(u3_raty_cand == typ_e);
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uL(fprintf(uH, "raft: cand -> foll\n"));
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}
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}
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/* _raft_note_term(): note a term from the network, demoting if it is newer.
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*/
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static void
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_raft_note_term(u3_raft* raf_u, c3_w tem_w)
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{
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if ( raf_u->tem_w < tem_w ) {
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uL(fprintf(uH, "raft: got term from network: %d\n", tem_w));
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raf_u->tem_w = tem_w;
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u3_sist_put("term", (c3_y*)&raf_u->tem_w, sizeof(c3_w));
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c3_assert(raf_u->typ_e != u3_raty_none);
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if ( raf_u->typ_e == u3_raty_foll ) {
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c3_assert(0 == raf_u->vot_w);
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} else _raft_demote(raf_u);
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}
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}
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/* _raft_rest_name(): update conn name from incoming request.
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**
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** If this connection already has a name, make sure the passed name
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** matches. Otherwise, try to associate it with a name, killing old
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** connections to that name.
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*/
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static void // TODO indicate whether conn died
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_raft_rest_name(u3_rcon* ron_u, const c3_c* nam_c)
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{
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if ( 0 != ron_u->nam_u ) {
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if ( 0 != strcmp(ron_u->nam_u->str_c, nam_c) ) {
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uL(fprintf(uH, "raft: names disagree o:%s n:%s\n",
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ron_u->nam_u->str_c, nam_c));
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_raft_conn_dead(ron_u);
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}
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}
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else {
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u3_raft* raf_u = ron_u->raf_u;
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u3_rnam* nam_u = raf_u->nam_u;
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while ( nam_u ) {
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if ( 0 == strcmp(nam_u->str_c, nam_c) ) {
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if ( nam_u->ron_u ) {
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c3_assert(nam_u->ron_u != ron_u);
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//uL(fprintf(uH, "raft: closing old conn %p to %s (%p)\n",
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// nam_u->ron_u, nam_u->str_c, ron_u));
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_raft_conn_dead(nam_u->ron_u);
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}
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uL(fprintf(uH, "raft: incoming conn from %s\n", nam_u->str_c));
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nam_u->ron_u = ron_u;
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ron_u->nam_u = nam_u;
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_raft_remove_run(ron_u);
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break;
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}
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else nam_u = nam_u->nex_u;
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}
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if ( 0 == ron_u->nam_u ) {
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uL(fprintf(uH, "connection from unkown peer %s\n", nam_c));
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_raft_conn_dead(ron_u);
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}
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}
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}
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/* _raft_do_rest(): effects of an incoming request.
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*/
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static void
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_raft_do_rest(u3_rcon* ron_u, const u3_rmsg* msg_u)
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{
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u3_raft* raf_u = ron_u->raf_u;
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if ( u3_raty_cand == raf_u->typ_e || u3_raty_foll == raf_u->typ_e ) {
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c3_i sas_i;
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sas_i = uv_timer_stop(&raf_u->tim_u);
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c3_assert(0 == sas_i);
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sas_i = uv_timer_start(&raf_u->tim_u, _raft_time_cb,
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_raft_election_rand(), 0);
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c3_assert(0 == sas_i);
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}
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_raft_rest_name(ron_u, msg_u->rest.nam_c);
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_raft_note_term(raf_u, msg_u->tem_w);
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}
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/* _raft_do_apen(): Handle incoming AppendEntries.
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*/
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static void
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_raft_do_apen(u3_rcon* ron_u, const u3_rmsg* msg_u)
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{
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c3_assert(c3__apen == msg_u->typ_w);
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_raft_do_rest(ron_u, msg_u);
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/* TODO respond */
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}
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/* _raft_apen_done(): process AppendEntries response.
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*/
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static void
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_raft_apen_done(u3_rreq* req_u, c3_w suc_w)
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{
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c3_assert(c3__apen == req_u->msg_u->typ_w);
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/* TODO */
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}
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/* _raft_do_revo(): Handle incoming RequestVote.
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*/
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static void
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_raft_do_revo(u3_rcon* ron_u, const u3_rmsg* msg_u)
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{
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u3_raft* raf_u = ron_u->raf_u;
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c3_assert(c3__revo == msg_u->typ_w);
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_raft_do_rest(ron_u, msg_u);
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c3_assert(0 != ron_u->nam_u);
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if ( msg_u->tem_w >= raf_u->tem_w &&
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(0 == raf_u->vog_c ||
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0 == strcmp(raf_u->vog_c, ron_u->nam_u->str_c)) &&
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(raf_u->lat_w < msg_u->rest.lat_w ||
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(raf_u->lat_w == msg_u->rest.lat_w &&
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raf_u->ent_d <= msg_u->rest.lai_d)) )
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{
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raf_u->vog_c = ron_u->nam_u->str_c;
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u3_sist_put("vote", (c3_y*)raf_u->vog_c, strlen(raf_u->vog_c));
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uL(fprintf(uH, "raft: granting vote to %s\n", raf_u->vog_c));
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_raft_send_rasp(ron_u, 1);
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}
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else _raft_send_rasp(ron_u, 0);
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}
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/* _raft_revo_done(): process RequestVote response.
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*/
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static void
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_raft_revo_done(u3_rreq* req_u, c3_w suc_w)
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{
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u3_rcon* ron_u = req_u->ron_u;
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u3_raft* raf_u = ron_u->raf_u;
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c3_assert(c3__revo == req_u->msg_u->typ_w);
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if ( suc_w && req_u->msg_u->tem_w == raf_u->tem_w ) {
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if ( c3n == ron_u->nam_u->vog ) {
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ron_u->nam_u->vog = c3y;
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raf_u->vot_w++;
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}
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else {
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uL(fprintf(uH, "XX raft: duplicate response for %s [tem:%d]\n",
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ron_u->nam_u->str_c, raf_u->tem_w));
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}
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}
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if ( raf_u->vot_w > raf_u->pop_w / 2 ) {
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uL(fprintf(uH, "raft: got majority of %d for term %d\n",
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raf_u->vot_w, raf_u->tem_w));
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_raft_promote(raf_u);
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}
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}
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/* _raft_do_rasp(): act on an incoming raft RPC response.
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*/
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static void
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_raft_do_rasp(u3_rcon* ron_u, u3_rmsg* msg_u)
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{
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u3_raft* raf_u = ron_u->raf_u;
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c3_assert(c3__rasp == msg_u->typ_w);
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if ( 0 == ron_u->nam_u ) {
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uL(fprintf(uH, "raft: invalid connection from unknown host\n"));
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_raft_conn_dead(ron_u);
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}
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else {
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u3_rreq* req_u = ron_u->out_u;
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if ( !req_u ) {
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uL(fprintf(uH, "raft: response with no request from %s\n",
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ron_u->nam_u->str_c));
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_raft_conn_dead(ron_u);
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}
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else {
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switch ( req_u->msg_u->typ_w ) {
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default: {
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uL(fprintf(uH, "raft: bogus request type %x?!\n",
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req_u->msg_u->typ_w));
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c3_assert(0);
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}
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case c3__apen: {
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_raft_apen_done(req_u, msg_u->rasp.suc_w);
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break;
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}
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case c3__revo: {
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_raft_revo_done(req_u, msg_u->rasp.suc_w);
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break;
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}
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}
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_raft_note_term(raf_u, msg_u->tem_w);
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ron_u->out_u = req_u->nex_u;
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if ( 0 == req_u->nex_u ) {
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c3_assert(req_u == ron_u->tou_u);
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ron_u->tou_u = 0;
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}
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_raft_rreq_free(req_u);
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}
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}
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}
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/* _raft_rmsg_read(): read a u3_rmsg from a buffer.
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**
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** Returns <0 on parse failure.
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** Returns 0 on partial data.
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** Returns bytes read on successful read.
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**
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** If successful, caller must eventually call _raft_free_rmsg() on msg_u.
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*/
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static ssize_t
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_raft_rmsg_read(const u3_rbuf* buf_u, u3_rmsg* msg_u)
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{
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ssize_t red_i = 0;
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c3_d ben_d;
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if ( buf_u->len_w < sizeof(c3_w) + sizeof(c3_d) ) {
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return 0;
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}
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memcpy(&msg_u->ver_w, buf_u->buf_y + red_i, sizeof(c3_w));
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red_i += sizeof(c3_w);
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if ( msg_u->ver_w != u3r_mug('a') ) {
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uL(fprintf(uH, "raft: versions don't match: %x %x\n",
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msg_u->ver_w, u3r_mug('a')));
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return -1;
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}
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memcpy(&msg_u->len_d, buf_u->buf_y + red_i, sizeof(c3_d));
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red_i += sizeof(c3_d);
|
|
|
|
if ( msg_u->len_d < 4 ) {
|
|
uL(fprintf(uH, "raft: length too short (a) %" PRIu64 "\n", msg_u->len_d));
|
|
return -1;
|
|
}
|
|
|
|
ben_d = 4ULL * msg_u->len_d;
|
|
|
|
if ( buf_u->len_w < ben_d ) {
|
|
return 0;
|
|
}
|
|
|
|
if ( ben_d < red_i + 2 * sizeof(c3_w) ) {
|
|
uL(fprintf(uH, "raft: length too short (b) %" PRIu64 "\n", msg_u->len_d));
|
|
return -1;
|
|
}
|
|
memcpy(&msg_u->tem_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
memcpy(&msg_u->typ_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
|
|
switch ( msg_u->typ_w ) {
|
|
default: {
|
|
uL(fprintf(uH, "raft: unknown msg type %x\n", msg_u->typ_w));
|
|
return -1;
|
|
}
|
|
case c3__rasp: {
|
|
if ( ben_d < red_i + sizeof(c3_w) ) {
|
|
uL(fprintf(uH, "raft: length too short (c) %" PRIu64 "\n", msg_u->len_d));
|
|
return -1;
|
|
}
|
|
memcpy(&msg_u->rasp.suc_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
break;
|
|
}
|
|
case c3__apen: case c3__revo: {
|
|
if ( ben_d < red_i + sizeof(c3_d) + 2 * sizeof(c3_w) ) {
|
|
uL(fprintf(uH, "raft: length too short (d) %" PRIu64 "\n", msg_u->len_d));
|
|
return -1;
|
|
}
|
|
memcpy(&msg_u->rest.lai_d, buf_u->buf_y + red_i, sizeof(c3_d));
|
|
red_i += sizeof(c3_d);
|
|
memcpy(&msg_u->rest.lat_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
memcpy(&msg_u->rest.nam_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
|
|
if ( ben_d < red_i + 4 * msg_u->rest.nam_w ) {
|
|
uL(fprintf(uH, "raft: length too short (e) %" PRIu64 "\n", msg_u->len_d));
|
|
return -1;
|
|
}
|
|
msg_u->rest.nam_c = c3_malloc(4 * msg_u->rest.nam_w);
|
|
strncpy(msg_u->rest.nam_c, (const char*)(buf_u->buf_y + red_i), 4 * msg_u->rest.nam_w + 1);
|
|
red_i += 4 * msg_u->rest.nam_w;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( c3__apen == msg_u->typ_w ) {
|
|
if ( ben_d < red_i + 2 * sizeof(c3_d) ) {
|
|
uL(fprintf(uH, "raft: length too short (f) %" PRIu64 "\n", msg_u->len_d));
|
|
red_i = -1;
|
|
goto fail;
|
|
}
|
|
memcpy(&msg_u->rest.apen.cit_d, buf_u->buf_y + red_i, sizeof(c3_d));
|
|
red_i += sizeof(c3_d);
|
|
memcpy(&msg_u->rest.apen.ent_d, buf_u->buf_y + red_i, sizeof(c3_d));
|
|
red_i += sizeof(c3_d);
|
|
|
|
msg_u->rest.apen.ent_u = calloc(
|
|
1, msg_u->rest.apen.ent_d * sizeof(u3_rent));
|
|
{
|
|
c3_d i_d;
|
|
u3_rent* ent_u = msg_u->rest.apen.ent_u;
|
|
|
|
for ( i_d = 0; i_d < msg_u->rest.apen.ent_d; i_d++ ) {
|
|
if ( ben_d < red_i + 3 * sizeof(c3_w) ) {
|
|
uL(fprintf(uH, "raft: length too short (g) %" PRIu64 "\n", msg_u->len_d));
|
|
red_i = -1;
|
|
goto fail;
|
|
}
|
|
memcpy(&ent_u[i_d].tem_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
memcpy(&ent_u[i_d].typ_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
memcpy(&ent_u[i_d].len_w, buf_u->buf_y + red_i, sizeof(c3_w));
|
|
red_i += sizeof(c3_w);
|
|
if ( ben_d < red_i + 4 * ent_u[i_d].len_w ) {
|
|
uL(fprintf(uH, "raft: length too short (h) %" PRIu64 "\n", msg_u->len_d));
|
|
red_i = -1;
|
|
goto fail;
|
|
}
|
|
ent_u[i_d].bob_w = c3_malloc(4 * ent_u[i_d].len_w);
|
|
memcpy(ent_u[i_d].bob_w, buf_u->buf_y + red_i, 4 * ent_u[i_d].len_w);
|
|
red_i += 4 * ent_u[i_d].len_w;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( red_i != ben_d ) {
|
|
uL(fprintf(uH, "raft: sizes don't match r:%zd w:%" PRIu64 "\n", red_i, ben_d));
|
|
red_i = -1;
|
|
goto fail;
|
|
}
|
|
|
|
out:
|
|
return red_i;
|
|
fail:
|
|
_raft_rmsg_free(msg_u);
|
|
goto out;
|
|
}
|
|
|
|
/* _raft_rbuf_grow(): append data to the buffer, reallocating if needed.
|
|
**
|
|
** Returns new buffer location, as realloc.
|
|
*/
|
|
static u3_rbuf*
|
|
_raft_rbuf_grow(u3_rbuf* buf_u, const c3_y* buf_y, size_t siz_i)
|
|
{
|
|
if ( 0 == buf_u ) {
|
|
buf_u = c3_malloc(sizeof(*buf_u) + siz_i);
|
|
buf_u->len_w = 0;
|
|
buf_u->cap_w = siz_i;
|
|
}
|
|
|
|
if ( buf_u->cap_w < buf_u->len_w + siz_i ) {
|
|
c3_w cap_w = c3_max(2 * buf_u->cap_w, buf_u->len_w + siz_i);
|
|
|
|
buf_u = realloc(buf_u, sizeof(*buf_u) + cap_w);
|
|
buf_u->cap_w = cap_w;
|
|
}
|
|
|
|
memcpy(buf_u->buf_y + buf_u->len_w, buf_y, siz_i);
|
|
buf_u->len_w += siz_i;
|
|
return buf_u;
|
|
}
|
|
|
|
/* _raft_bytes_send():
|
|
*/
|
|
static void
|
|
_raft_bytes_send(u3_rcon* ron_u, const void* ptr_v, size_t siz_i)
|
|
{
|
|
ron_u->wri_u = _raft_rbuf_grow(ron_u->wri_u, ptr_v, siz_i);
|
|
}
|
|
|
|
/* _raft_rmsg_send(): send a u3_rmsg over the wire.
|
|
*/
|
|
static void
|
|
_raft_rmsg_send(u3_rcon* ron_u, const u3_rmsg* msg_u)
|
|
{
|
|
c3_d len_d = sizeof(c3_d) + 3 * sizeof(c3_w);
|
|
|
|
_raft_bytes_send(ron_u, &msg_u->ver_w, sizeof(c3_w));
|
|
_raft_bytes_send(ron_u, &msg_u->len_d, sizeof(c3_d));
|
|
_raft_bytes_send(ron_u, &msg_u->tem_w, sizeof(c3_w));
|
|
_raft_bytes_send(ron_u, &msg_u->typ_w, sizeof(c3_w));
|
|
switch ( msg_u->typ_w ) {
|
|
default: {
|
|
uL(fprintf(uH, "raft: send: unknown message type\n"));
|
|
c3_assert(0);
|
|
}
|
|
case c3__rasp: {
|
|
len_d += sizeof(c3_w);
|
|
_raft_bytes_send(ron_u, &msg_u->rasp.suc_w, sizeof(c3_w));
|
|
break;
|
|
}
|
|
case c3__apen: case c3__revo: {
|
|
len_d += sizeof(c3_d) + 2 * sizeof(c3_w) + 4 * msg_u->rest.nam_w;
|
|
_raft_bytes_send(ron_u, &msg_u->rest.lai_d, sizeof(c3_d));
|
|
_raft_bytes_send(ron_u, &msg_u->rest.lat_w, sizeof(c3_w));
|
|
_raft_bytes_send(ron_u, &msg_u->rest.nam_w, sizeof(c3_w));
|
|
_raft_bytes_send(ron_u, msg_u->rest.nam_c, 4 * msg_u->rest.nam_w);
|
|
break;
|
|
}
|
|
}
|
|
if ( c3__apen == msg_u->typ_w ) {
|
|
c3_d i_d;
|
|
u3_rent* ent_u = msg_u->rest.apen.ent_u;
|
|
|
|
len_d += 2 * sizeof(c3_d);
|
|
_raft_bytes_send(ron_u, &msg_u->rest.apen.cit_d, sizeof(c3_d));
|
|
_raft_bytes_send(ron_u, &msg_u->rest.apen.ent_d, sizeof(c3_d));
|
|
for ( i_d = 0; i_d < msg_u->rest.apen.ent_d; i_d++ ) {
|
|
len_d += 3 * sizeof(c3_w) + ent_u[i_d].len_w;
|
|
_raft_bytes_send(ron_u, &ent_u[i_d].tem_w, sizeof(c3_w));
|
|
_raft_bytes_send(ron_u, &ent_u[i_d].typ_w, sizeof(c3_w));
|
|
_raft_bytes_send(ron_u, &ent_u[i_d].len_w, sizeof(c3_w));
|
|
_raft_bytes_send(ron_u, ent_u[i_d].bob_w, ent_u[i_d].len_w);
|
|
}
|
|
}
|
|
|
|
//uL(fprintf(uH, "raft: sent %" PRIu64 " (%" PRIu64 ") [%x]\n",
|
|
// len_d, msg_u->len_d, msg_u->typ_w));
|
|
c3_assert(len_d == 4 * msg_u->len_d);
|
|
}
|
|
|
|
/* _raft_rmsg_free(): free a u3_rmsg's resources (but not the msg itself).
|
|
*/
|
|
static void
|
|
_raft_rmsg_free(u3_rmsg* msg_u) {
|
|
if ( c3__apen == msg_u->typ_w && msg_u->rest.apen.ent_u ) {
|
|
c3_d i_d;
|
|
|
|
for ( i_d = 0; i_d < msg_u->rest.apen.ent_d; i_d++ ) {
|
|
free(msg_u->rest.apen.ent_u[i_d].bob_w);
|
|
}
|
|
free(msg_u->rest.apen.ent_u);
|
|
msg_u->rest.apen.ent_u = 0;
|
|
}
|
|
if ( c3__apen == msg_u->typ_w || c3__revo == msg_u->typ_w ) {
|
|
free(msg_u->rest.nam_c);
|
|
msg_u->rest.nam_c = 0;
|
|
}
|
|
}
|
|
|
|
/* An unusual lameness in libuv.
|
|
*/
|
|
struct _u3_write_t {
|
|
uv_write_t wri_u;
|
|
c3_y* buf_y;
|
|
};
|
|
|
|
/* _raft_write_cb(): generic write callback.
|
|
*/
|
|
static void
|
|
_raft_write_cb(uv_write_t* wri_u, c3_i sas_i)
|
|
{
|
|
struct _u3_write_t* req_u = (struct _u3_write_t*)wri_u;
|
|
|
|
if ( 0 != sas_i ) {
|
|
uL(fprintf(uH, "raft: write_cb: error\n"));
|
|
_raft_conn_dead((u3_rcon*)wri_u->handle);
|
|
}
|
|
free(req_u->buf_y);
|
|
free(req_u);
|
|
}
|
|
|
|
/* _raft_conn_work(): read and write requests and responses.
|
|
*/
|
|
static void
|
|
_raft_conn_work(u3_rcon* ron_u)
|
|
{
|
|
c3_assert(c3y == ron_u->liv);
|
|
if ( c3y == ron_u->red ) {
|
|
c3_assert(ron_u->red_u);
|
|
ron_u->red = c3n;
|
|
while (1) {
|
|
u3_rmsg msg_u;
|
|
ssize_t ret_i = _raft_rmsg_read(ron_u->red_u, &msg_u);
|
|
|
|
if ( ret_i < 0 ) {
|
|
if ( ron_u->nam_u ) {
|
|
uL(fprintf(uH, "raft: conn_work: error reading from %s\n",
|
|
ron_u->nam_u->str_c));
|
|
}
|
|
else {
|
|
uL(fprintf(uH, "raft: conn_work: error reading\n"));
|
|
}
|
|
_raft_conn_dead(ron_u);
|
|
break;
|
|
}
|
|
else if ( ret_i == 0 ) {
|
|
break;
|
|
}
|
|
else {
|
|
if ( 4 * msg_u.len_d != ret_i ) {
|
|
uL(fprintf(uH, "raft: conn_work: lengths don't match\n"));
|
|
c3_assert(0);
|
|
}
|
|
else {
|
|
c3_assert(ron_u->red_u->len_w >= ret_i);
|
|
memmove(ron_u->red_u->buf_y,
|
|
ron_u->red_u->buf_y + ret_i,
|
|
ron_u->red_u->len_w - ret_i);
|
|
ron_u->red_u->len_w -= ret_i;
|
|
|
|
switch ( msg_u.typ_w ) {
|
|
default: {
|
|
uL(fprintf(uH, "raft: work: unknown message type %x\n",
|
|
msg_u.typ_w));
|
|
break;
|
|
}
|
|
case c3__apen: {
|
|
_raft_do_apen(ron_u, &msg_u);
|
|
break;
|
|
}
|
|
case c3__revo: {
|
|
_raft_do_revo(ron_u, &msg_u);
|
|
break;
|
|
}
|
|
case c3__rasp: {
|
|
_raft_do_rasp(ron_u, &msg_u);
|
|
break;
|
|
}
|
|
}
|
|
_raft_rmsg_free(&msg_u);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( ron_u->wri_u && ron_u->wri_u->len_w > 0 ) {
|
|
uv_buf_t buf_u;
|
|
struct _u3_write_t* req_u = c3_malloc(sizeof(*req_u));
|
|
|
|
|
|
req_u->buf_y = c3_malloc(ron_u->wri_u->len_w);
|
|
memcpy(req_u->buf_y, ron_u->wri_u->buf_y, ron_u->wri_u->len_w);
|
|
buf_u.base = (char*)req_u->buf_y;
|
|
buf_u.len = ron_u->wri_u->len_w;
|
|
|
|
c3_w ret_w;
|
|
if ( 0 != (ret_w = uv_write((uv_write_t*)req_u,
|
|
(uv_stream_t*)&ron_u->wax_u,
|
|
&buf_u,
|
|
1,
|
|
_raft_write_cb)) )
|
|
{
|
|
uL(fprintf(uH, "raft: conn_work (write): %s\n",
|
|
uv_strerror(ret_w)));
|
|
free(req_u->buf_y);
|
|
free(req_u);
|
|
}
|
|
else {
|
|
ron_u->wri_u->len_w = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* _raft_conn_read_cb(): generic connection read callback.
|
|
*/
|
|
static void
|
|
_raft_conn_read_cb(uv_stream_t* tcp_u,
|
|
ssize_t siz_i,
|
|
const uv_buf_t * buf_u)
|
|
{
|
|
u3_rcon* ron_u = (u3_rcon*)tcp_u;
|
|
|
|
u3_lo_open();
|
|
{
|
|
if ( siz_i < 0 ) {
|
|
uL(fprintf(uH, "raft: read ERROR"));
|
|
_raft_conn_dead(ron_u);
|
|
}
|
|
else if ( siz_i == 0 ) {
|
|
// do nothing
|
|
}
|
|
else {
|
|
if ( c3y == ron_u->liv ) {
|
|
ron_u->red_u = _raft_rbuf_grow(ron_u->red_u, (c3_y*)buf_u->base, siz_i);
|
|
ron_u->red = c3y;
|
|
_raft_conn_work(ron_u);
|
|
}
|
|
else uL(fprintf(uH, "XX raft: read on dead conn %p\n", ron_u));
|
|
}
|
|
}
|
|
free(buf_u->base);
|
|
u3_lo_shut(c3n);
|
|
}
|
|
|
|
/* _raft_conn_new(): allocate a new raft connection.
|
|
*/
|
|
static u3_rcon*
|
|
_raft_conn_new(u3_raft* raf_u)
|
|
{
|
|
u3_rcon* ron_u = c3_malloc(sizeof(*ron_u));
|
|
|
|
uv_tcp_init(u3L, &ron_u->wax_u);
|
|
ron_u->red_u = 0;
|
|
ron_u->out_u = ron_u->tou_u = 0;
|
|
ron_u->red_u = 0;
|
|
ron_u->red = c3n;
|
|
ron_u->wri_u = 0;
|
|
ron_u->nam_u = 0;
|
|
ron_u->raf_u = raf_u;
|
|
ron_u->nex_u = 0;
|
|
ron_u->liv = c3n;
|
|
|
|
return ron_u;
|
|
}
|
|
|
|
/* _raft_remove_run(): remove a connection from the list of unknowns.
|
|
*/
|
|
static u3_noun
|
|
_raft_remove_run(u3_rcon* ron_u)
|
|
{
|
|
u3_raft* raf_u = ron_u->raf_u;
|
|
u3_noun suc = c3n;
|
|
|
|
if ( raf_u->run_u == ron_u ) {
|
|
raf_u->run_u = ron_u->nex_u;
|
|
suc = c3y;
|
|
}
|
|
else {
|
|
u3_rcon* pre_u = raf_u->run_u;
|
|
|
|
while ( pre_u ) {
|
|
if ( pre_u->nex_u == ron_u ) {
|
|
pre_u->nex_u = ron_u->nex_u;
|
|
suc = c3y;
|
|
break;
|
|
}
|
|
else pre_u = pre_u->nex_u;
|
|
}
|
|
}
|
|
|
|
return suc;
|
|
}
|
|
|
|
static u3_rreq*
|
|
_raft_rreq_new(u3_rcon* ron_u)
|
|
{
|
|
u3_rreq* req_u = c3_malloc(sizeof(*req_u));
|
|
|
|
req_u->msg_u = c3_malloc(sizeof(*req_u->msg_u));
|
|
req_u->nex_u = 0;
|
|
req_u->ron_u = ron_u;
|
|
if ( ron_u->tou_u ) {
|
|
c3_assert(ron_u->out_u);
|
|
ron_u->tou_u->nex_u = req_u;
|
|
ron_u->tou_u = req_u;
|
|
}
|
|
else {
|
|
c3_assert(0 == ron_u->out_u);
|
|
ron_u->tou_u = ron_u->out_u = req_u;
|
|
}
|
|
return req_u;
|
|
}
|
|
|
|
static void
|
|
_raft_rreq_free(u3_rreq* req_u)
|
|
{
|
|
_raft_rmsg_free(req_u->msg_u);
|
|
free(req_u->msg_u); // XX
|
|
free(req_u);
|
|
}
|
|
|
|
/* _raft_conn_free(): unlink a connection and free its resources.
|
|
*/
|
|
static void
|
|
_raft_conn_free(uv_handle_t* had_u)
|
|
{
|
|
u3_rcon* ron_u = (void*)had_u;
|
|
u3_raft* raf_u = ron_u->raf_u;
|
|
|
|
//uL(fprintf(uH, "raft: conn_free %p\n", ron_u));
|
|
|
|
// Unlink references.
|
|
if ( ron_u->nam_u ) {
|
|
c3_assert(c3n == _raft_remove_run(ron_u));
|
|
if ( ron_u->nam_u->ron_u == ron_u ) {
|
|
ron_u->nam_u->ron_u = 0;
|
|
}
|
|
}
|
|
else {
|
|
u3_noun suc = _raft_remove_run(ron_u);
|
|
c3_assert(c3y == suc);
|
|
// Slow, expensive debug assert.
|
|
{
|
|
u3_rnam* nam_u = raf_u->nam_u;
|
|
|
|
while ( nam_u ) {
|
|
c3_assert(nam_u->ron_u != ron_u);
|
|
nam_u = nam_u->nex_u;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Free requests.
|
|
{
|
|
u3_rreq* req_u = ron_u->out_u;
|
|
|
|
if ( 0 == req_u ) {
|
|
c3_assert(0 == ron_u->tou_u);
|
|
}
|
|
else {
|
|
while ( req_u ) {
|
|
if ( 0 == req_u->nex_u ) {
|
|
c3_assert(req_u == ron_u->tou_u);
|
|
}
|
|
ron_u->out_u = req_u->nex_u;
|
|
_raft_rreq_free(req_u);
|
|
req_u = ron_u->out_u;
|
|
}
|
|
}
|
|
}
|
|
free(ron_u->red_u);
|
|
free(ron_u->wri_u);
|
|
free(ron_u);
|
|
}
|
|
|
|
/* _raft_conn_dead(): kill a connection.
|
|
*/
|
|
static void
|
|
_raft_conn_dead(u3_rcon* ron_u)
|
|
{
|
|
if ( c3n == ron_u->liv ) {
|
|
//uL(fprintf(uH, "raft: conn already dead %p\n", ron_u));
|
|
return;
|
|
}
|
|
else {
|
|
uL(fprintf(uH, "raft: conn_dead %p\n", ron_u));
|
|
ron_u->liv = c3n;
|
|
}
|
|
|
|
uv_read_stop((uv_stream_t*)&ron_u->wax_u);
|
|
uv_close((uv_handle_t*)&ron_u->wax_u, _raft_conn_free);
|
|
}
|
|
|
|
/* _raft_listen_cb(): generic listen callback.
|
|
*/
|
|
static void
|
|
_raft_listen_cb(uv_stream_t* str_u, c3_i sas_i)
|
|
{
|
|
u3_raft* raf_u = (u3_raft*)str_u;
|
|
|
|
if ( 0 != sas_i ) {
|
|
uL(fprintf(uH, "raft: listen_cb: error\n"));
|
|
}
|
|
else {
|
|
u3_rcon* ron_u = _raft_conn_new(raf_u);
|
|
|
|
if ( 0 != uv_accept((uv_stream_t*)&raf_u->wax_u,
|
|
(uv_stream_t*)&ron_u->wax_u) )
|
|
{
|
|
uL(fprintf(uH, "raft: accept: error\n"));
|
|
|
|
uv_close((uv_handle_t*)&ron_u->wax_u, 0);
|
|
free(ron_u);
|
|
}
|
|
else {
|
|
ron_u->liv = c3y;
|
|
|
|
uv_read_start((uv_stream_t*)&ron_u->wax_u,
|
|
_raft_alloc,
|
|
_raft_conn_read_cb);
|
|
|
|
ron_u->nex_u = raf_u->run_u;
|
|
raf_u->run_u = ron_u;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* _raft_connect_cb(): generic connection callback.
|
|
*/
|
|
static void
|
|
_raft_connect_cb(uv_connect_t* con_u, c3_i sas_i)
|
|
{
|
|
u3_rcon* ron_u = con_u->data;
|
|
free(con_u);
|
|
|
|
if ( 0 != sas_i ) {
|
|
uL(fprintf(uH, "raft: connect_cb: %s\n",
|
|
uv_strerror(sas_i)));
|
|
uv_close((uv_handle_t*)&ron_u->wax_u, _raft_conn_free);
|
|
}
|
|
else {
|
|
c3_assert(ron_u->nam_u);
|
|
uL(fprintf(uH, "raft: connected to %s\n", ron_u->nam_u->str_c));
|
|
ron_u->liv = c3y;
|
|
|
|
uv_read_start((uv_stream_t*)&ron_u->wax_u,
|
|
_raft_alloc,
|
|
_raft_conn_read_cb);
|
|
|
|
_raft_conn_work(ron_u);
|
|
}
|
|
}
|
|
|
|
/* _raft_getaddrinfo_cb(): generic getaddrinfo callback.
|
|
*/
|
|
static void
|
|
_raft_getaddrinfo_cb(uv_getaddrinfo_t* raq_u,
|
|
c3_i sas_i,
|
|
struct addrinfo* add_u)
|
|
{
|
|
struct addrinfo* res_u;
|
|
uv_connect_t* con_u = c3_malloc(sizeof(*con_u));
|
|
u3_rcon* ron_u = raq_u->data;
|
|
|
|
//uL(fprintf(uH, "getaddrinfo_cb %s\n", ron_u->nam_u->nam_c));
|
|
|
|
con_u->data = ron_u;
|
|
for ( res_u = add_u; res_u; res_u = res_u->ai_next ) {
|
|
if ( 0 != uv_tcp_connect(con_u,
|
|
&ron_u->wax_u,
|
|
(const struct sockaddr*)res_u->ai_addr,
|
|
_raft_connect_cb) )
|
|
{
|
|
uL(fprintf(uH, "raft: getaddrinfo_cb: %s\n",
|
|
uv_strerror(sas_i)));
|
|
uv_close((uv_handle_t*)&ron_u->wax_u, 0);
|
|
continue;
|
|
}
|
|
else {
|
|
#if 0
|
|
c3_c add_c[17] = {'\0'};
|
|
|
|
uv_ip4_name((struct sockaddr_in*)res_u->ai_addr, add_c, 16);
|
|
uL(fprintf(uH, "raft: conn %s\n", add_c));
|
|
#endif
|
|
break; // Found one
|
|
}
|
|
}
|
|
if ( !res_u ) {
|
|
uL(fprintf(uH, "raft: getaddrinfo_cb: no address matched\n"));
|
|
_raft_conn_free((uv_handle_t*)&ron_u->wax_u);
|
|
free(con_u);
|
|
}
|
|
uv_freeaddrinfo(add_u);
|
|
free(raq_u);
|
|
}
|
|
|
|
/* _raft_conn_all(): ensure that we are connected to each peer.
|
|
*/
|
|
static void
|
|
_raft_conn_all(u3_raft* raf_u, void (*con_f)(u3_rcon* ron_u))
|
|
{
|
|
u3_rnam* nam_u = raf_u->nam_u;
|
|
u3_rcon* ron_u;
|
|
|
|
while ( nam_u ) {
|
|
if ( 0 == nam_u->ron_u || c3n == nam_u->ron_u->liv ) {
|
|
struct addrinfo hit_u;
|
|
uv_getaddrinfo_t* raq_u = c3_malloc(sizeof(*raq_u));
|
|
|
|
ron_u = _raft_conn_new(raf_u);
|
|
|
|
//uL(fprintf(uH, "raft: new conn to %s:%s %p\n",
|
|
// nam_u->nam_c, nam_u->por_c, ron_u));
|
|
|
|
memset(&hit_u, 0, sizeof(hit_u));
|
|
hit_u.ai_family = AF_INET;
|
|
hit_u.ai_socktype = SOCK_STREAM;
|
|
hit_u.ai_protocol = IPPROTO_TCP;
|
|
|
|
raq_u->data = ron_u;
|
|
|
|
int ret;
|
|
if ( 0 != (ret = uv_getaddrinfo(u3L,
|
|
raq_u,
|
|
_raft_getaddrinfo_cb,
|
|
nam_u->nam_c,
|
|
nam_u->por_c,
|
|
&hit_u) ))
|
|
{
|
|
uL(fprintf(uH, "raft: getaddrinfo: %s\n",
|
|
uv_strerror(ret)));
|
|
|
|
uv_close((uv_handle_t*)&ron_u->wax_u, 0);
|
|
free(raq_u);
|
|
free(ron_u);
|
|
c3_assert(0);
|
|
}
|
|
else {
|
|
ron_u->nam_u = nam_u;
|
|
nam_u->ron_u = ron_u;
|
|
}
|
|
|
|
con_f(nam_u->ron_u);
|
|
}
|
|
else {
|
|
//uL(fprintf(uH, "raft: existing connection %p for %s\n",
|
|
// nam_u->ron_u, nam_u->str_c));
|
|
con_f(nam_u->ron_u);
|
|
if ( c3y == nam_u->ron_u->liv ) {
|
|
_raft_conn_work(nam_u->ron_u);
|
|
}
|
|
}
|
|
nam_u = nam_u->nex_u;
|
|
}
|
|
}
|
|
|
|
/* _raft_write_base(): Populate the base fields of a u3_rmsg.
|
|
**
|
|
** Should not be called directly.
|
|
*/
|
|
static void
|
|
_raft_write_base(u3_rcon* ron_u, u3_rmsg* msg_u)
|
|
{
|
|
u3_raft* raf_u = ron_u->raf_u;
|
|
|
|
msg_u->ver_w = u3r_mug('a');
|
|
msg_u->tem_w = raf_u->tem_w;
|
|
msg_u->len_d = 5;
|
|
}
|
|
|
|
/* _raft_write_rest(): Write fields for an RPC request to msg_u.
|
|
**
|
|
** Should not be called directly.
|
|
*/
|
|
static void
|
|
_raft_write_rest(u3_rcon* ron_u, c3_d lai_d, c3_w lat_w, u3_rmsg* msg_u)
|
|
{
|
|
u3_raft* raf_u = ron_u->raf_u;
|
|
|
|
c3_assert(ron_u->nam_u);
|
|
_raft_write_base(ron_u, msg_u);
|
|
msg_u->rest.lai_d = lai_d;
|
|
msg_u->rest.lat_w = lat_w;
|
|
msg_u->rest.nam_w = 1 + strlen(raf_u->str_c) / 4;
|
|
msg_u->rest.nam_c = calloc(1, 4 * msg_u->rest.nam_w);
|
|
strncpy(msg_u->rest.nam_c, raf_u->str_c, 4 * msg_u->rest.nam_w + 1);
|
|
msg_u->len_d += 4 + msg_u->rest.nam_w;
|
|
}
|
|
|
|
/* _raft_write_apen(): Write fields for an AppendEntries request.
|
|
*/
|
|
static void
|
|
_raft_write_apen(u3_rcon* ron_u,
|
|
c3_d lai_d, c3_w lat_w,
|
|
c3_d cit_d, c3_d ent_d, u3_rent* ent_u,
|
|
u3_rmsg* msg_u)
|
|
{
|
|
_raft_write_rest(ron_u, lai_d, lat_w, msg_u);
|
|
msg_u->typ_w = c3__apen;
|
|
msg_u->rest.apen.cit_d = cit_d;
|
|
msg_u->rest.apen.ent_d = ent_d;
|
|
msg_u->len_d += 4;
|
|
|
|
msg_u->rest.apen.ent_u = ent_u;
|
|
{
|
|
c3_d i_d;
|
|
|
|
for ( i_d = 0; i_d < ent_d; i_d++ ) {
|
|
msg_u->len_d += 3 + ent_u[i_d].len_w;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* _raft_write_revo(): Write fields for a RequestVote request.
|
|
*/
|
|
static void
|
|
_raft_write_revo(u3_rcon* ron_u, u3_rmsg* msg_u)
|
|
{
|
|
u3_raft* raf_u = ron_u->raf_u;
|
|
|
|
_raft_write_rest(ron_u, raf_u->ent_d, raf_u->lat_w, msg_u);
|
|
msg_u->typ_w = c3__revo;
|
|
}
|
|
|
|
/* _raft_send_rasp(): Send a rasp (raft response) to a peer.
|
|
*/
|
|
static void
|
|
_raft_send_rasp(u3_rcon* ron_u, c3_t suc_t)
|
|
{
|
|
u3_rmsg msg_u;
|
|
|
|
_raft_write_base(ron_u, &msg_u);
|
|
msg_u.typ_w = c3__rasp;
|
|
msg_u.rasp.suc_w = suc_t;
|
|
msg_u.len_d += 1;
|
|
_raft_rmsg_send(ron_u, &msg_u);
|
|
}
|
|
|
|
/* _raft_send_beat(): send a heartbeat (empty AppendEntries) to a peer.
|
|
**
|
|
** Creates a new request.
|
|
*/
|
|
static void
|
|
_raft_send_beat(u3_rcon* ron_u)
|
|
{
|
|
u3_rreq* req_u = _raft_rreq_new(ron_u);
|
|
u3_rmsg* msg_u = req_u->msg_u;
|
|
|
|
c3_log_every(50, "raft: beat 50\n");
|
|
|
|
_raft_write_apen(ron_u, 0, 0, 0, 0, 0, msg_u);
|
|
_raft_rmsg_send(ron_u, msg_u);
|
|
}
|
|
|
|
/* _raft_send_revo(): send a RequestVote to a peer.
|
|
**
|
|
** Creates a new request.
|
|
*/
|
|
static void
|
|
_raft_send_revo(u3_rcon* ron_u)
|
|
{
|
|
u3_rreq* req_u = _raft_rreq_new(ron_u);
|
|
u3_rmsg* msg_u = req_u->msg_u;
|
|
|
|
_raft_write_revo(ron_u, msg_u);
|
|
_raft_rmsg_send(ron_u, msg_u);
|
|
}
|
|
|
|
/* _raft_start_election(): bump term, vote for self, solicit votes from peers.
|
|
*/
|
|
static void
|
|
_raft_start_election(u3_raft* raf_u)
|
|
{
|
|
c3_i sas_i;
|
|
|
|
c3_assert(0 == uv_is_active((uv_handle_t*)&raf_u->tim_u));
|
|
sas_i = uv_timer_start(&raf_u->tim_u, _raft_time_cb,
|
|
_raft_election_rand(), 0);
|
|
c3_assert(sas_i == 0);
|
|
|
|
raf_u->tem_w++;
|
|
u3_sist_put("term", (c3_y*)&raf_u->tem_w, sizeof(c3_w));
|
|
uL(fprintf(uH, "raft: starting election [tem:%d]\n", raf_u->tem_w));
|
|
|
|
{
|
|
u3_rnam* nam_u;
|
|
|
|
for ( nam_u = raf_u->nam_u; nam_u; nam_u = nam_u->nex_u ) {
|
|
nam_u->vog = c3n;
|
|
}
|
|
}
|
|
raf_u->vot_w = 1;
|
|
raf_u->vog_c = raf_u->str_c;
|
|
u3_sist_put("vote", (c3_y*)raf_u->vog_c, strlen(raf_u->vog_c));
|
|
|
|
_raft_conn_all(raf_u, _raft_send_revo);
|
|
}
|
|
|
|
/* _raft_heartbeat(): send a heartbeat to all peers.
|
|
*/
|
|
static void
|
|
_raft_heartbeat(u3_raft* raf_u)
|
|
{
|
|
_raft_conn_all(raf_u, _raft_send_beat);
|
|
}
|
|
|
|
/* _raft_time_cb(): generic timer callback.
|
|
**
|
|
** Called on election timeouts for non-leaders, and at heartbeat interval for
|
|
** leaders.
|
|
*/
|
|
static void
|
|
_raft_time_cb(uv_timer_t* tim_u)
|
|
{
|
|
u3_raft* raf_u = tim_u->data;
|
|
//uL(fprintf(uH, "raft: time\n"));
|
|
|
|
switch ( raf_u->typ_e ) {
|
|
default: {
|
|
uL(fprintf(uH, "raft: time_cb: unknown server state\n"));
|
|
c3_assert(0);
|
|
}
|
|
case u3_raty_foll: {
|
|
uL(fprintf(uH, "raft: foll -> cand\n"));
|
|
raf_u->typ_e = u3_raty_cand;
|
|
// continue to cand
|
|
}
|
|
case u3_raty_cand: {
|
|
_raft_start_election(raf_u);
|
|
break;
|
|
}
|
|
case u3_raty_lead: {
|
|
_raft_heartbeat(raf_u);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* _raft_foll_init(): begin, follower mode.
|
|
*/
|
|
static void
|
|
_raft_foll_init(u3_raft* raf_u)
|
|
{
|
|
uL(fprintf(uH, "raft: none -> foll\n"));
|
|
raf_u->typ_e = u3_raty_foll;
|
|
|
|
// Initialize and count peers.
|
|
{
|
|
u3_rnam* nam_u = u3_raft_readopt(u3_Host.ops_u.raf_c,
|
|
u3_Host.ops_u.nam_c,
|
|
u3_Host.ops_u.rop_s);
|
|
|
|
if ( 0 == nam_u ) {
|
|
uL(fprintf(uH, "raft: couldn't parse arg '%s'\n", u3_Host.ops_u.raf_c));
|
|
u3_lo_bail();
|
|
}
|
|
|
|
raf_u->pop_w = 1; raf_u->nam_u = nam_u;
|
|
while ( nam_u ) {
|
|
raf_u->pop_w++; nam_u = nam_u->nex_u;
|
|
}
|
|
}
|
|
|
|
// Set our name.
|
|
{
|
|
c3_i wri_i, siz_i;
|
|
|
|
siz_i = strlen(u3_Host.ops_u.nam_c) + strlen(":65536") + 1;
|
|
raf_u->str_c = c3_malloc(siz_i);
|
|
wri_i = snprintf(raf_u->str_c, siz_i, "%s:%d",
|
|
u3_Host.ops_u.nam_c, u3_Host.ops_u.rop_s);
|
|
c3_assert(wri_i < siz_i);
|
|
}
|
|
|
|
// Load persisted settings.
|
|
{
|
|
c3_w tem_w = 0;
|
|
c3_c* vog_c = 0;
|
|
c3_i ret_i;
|
|
|
|
if ( (ret_i = u3_sist_has("term")) >= 0 ) {
|
|
c3_assert(sizeof(c3_w) == ret_i);
|
|
u3_sist_get("term", (c3_y*)&tem_w);
|
|
uL(fprintf(uH, "raft: term from sist: %u\n", tem_w));
|
|
}
|
|
if ( (ret_i = u3_sist_has("vote")) >= 0 ) {
|
|
c3_assert(ret_i > 0);
|
|
vog_c = c3_malloc(ret_i);
|
|
u3_sist_get("vote", (c3_y*)vog_c);
|
|
uL(fprintf(uH, "raft: vote from sist: %s\n", vog_c));
|
|
}
|
|
|
|
raf_u->tem_w = tem_w;
|
|
if ( vog_c ) {
|
|
if ( 0 == strcmp(vog_c, raf_u->str_c) ) {
|
|
raf_u->vog_c = raf_u->str_c;
|
|
raf_u->vot_w = 1;
|
|
raf_u->typ_e = u3_raty_cand;
|
|
}
|
|
else {
|
|
u3_rnam* nam_u;
|
|
|
|
for ( nam_u = raf_u->nam_u; nam_u; nam_u = nam_u->nex_u ) {
|
|
if ( 0 == strcmp(vog_c, nam_u->str_c) ) {
|
|
raf_u->vog_c = nam_u->str_c;
|
|
break;
|
|
}
|
|
}
|
|
if ( 0 == nam_u ) {
|
|
uL(fprintf(uH, "raft: discarding unknown vote %s\n", vog_c));
|
|
}
|
|
}
|
|
free(vog_c);
|
|
}
|
|
}
|
|
|
|
// Bind the listener.
|
|
{
|
|
struct sockaddr_in add_u;
|
|
c3_w ret_w;
|
|
if (0 != (ret_w = uv_ip4_addr("0.0.0.0", u3_Host.ops_u.rop_s, &add_u ))){
|
|
uL(fprintf(uH, "raft: init: %s\n", uv_strerror(ret_w)));
|
|
c3_assert(0);
|
|
}
|
|
|
|
if ( 0 != (ret_w = uv_tcp_init(u3L, &raf_u->wax_u)) ) {
|
|
uL(fprintf(uH, "raft: init: %s\n", uv_strerror(ret_w)));
|
|
c3_assert(0);
|
|
}
|
|
if ( 0 != (ret_w = uv_tcp_bind(&raf_u->wax_u, (struct sockaddr *) & add_u, 0)) ) {
|
|
uL(fprintf(uH, "raft: bind: %s\n", uv_strerror(ret_w)));
|
|
c3_assert(0);
|
|
}
|
|
if ( 0 != (ret_w = uv_listen((uv_stream_t*)&raf_u->wax_u, 16, _raft_listen_cb)) ) {
|
|
uL(fprintf(uH, "raft: listen: %s\n", uv_strerror(ret_w)));
|
|
c3_assert(0);
|
|
}
|
|
else {
|
|
uL(fprintf(uH, "raft: on TCP %d\n", u3_Host.ops_u.rop_s));
|
|
}
|
|
}
|
|
|
|
// Start the initial election timeout.
|
|
uv_timer_start(&raf_u->tim_u, _raft_time_cb, _raft_election_rand(), 0);
|
|
}
|
|
|
|
/* _raft_lone_init(): begin, single-instance mode.
|
|
*/
|
|
static void
|
|
_raft_lone_init(u3_raft* raf_u)
|
|
{
|
|
uL(fprintf(uH, "raft: single-instance mode\n"));
|
|
raf_u->pop_w = 1;
|
|
_raft_promote(raf_u);
|
|
}
|
|
|
|
/* u3_raft_init(): start Raft process.
|
|
*/
|
|
void
|
|
u3_raft_init()
|
|
{
|
|
u3_raft* raf_u = u3Z;
|
|
|
|
// Initialize timer -- used in both single and multi-instance mode,
|
|
// for different things.
|
|
uv_timer_init(u3L, &raf_u->tim_u);
|
|
raf_u->tim_u.data = raf_u;
|
|
|
|
if ( 0 == u3_Host.ops_u.raf_c ) {
|
|
_raft_lone_init(raf_u);
|
|
}
|
|
else {
|
|
_raft_foll_init(raf_u);
|
|
}
|
|
}
|
|
|
|
/* _raft_sure(): apply and save an input ovum and its result.
|
|
*/
|
|
static void
|
|
_raft_sure(u3_noun ovo, u3_noun vir, u3_noun cor)
|
|
{
|
|
// Whatever worked, save it. (XX - should be concurrent with execute.)
|
|
// We'd like more events that don't change the state but need work here.
|
|
{
|
|
u3r_mug(cor);
|
|
u3r_mug(u3A->roc);
|
|
|
|
if ( c3n == u3r_sing(cor, u3A->roc) ) {
|
|
u3A->roe = u3nc(u3nc(vir, ovo), u3A->roe);
|
|
|
|
u3z(u3A->roc);
|
|
u3A->roc = cor;
|
|
}
|
|
else {
|
|
u3z(ovo);
|
|
|
|
// push a new event into queue
|
|
u3A->roe = u3nc(u3nc(vir, u3_nul), u3A->roe);
|
|
|
|
u3z(cor);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* _raft_lame(): handle an application failure.
|
|
*/
|
|
static void
|
|
_raft_lame(u3_noun ovo, u3_noun why, u3_noun tan)
|
|
{
|
|
u3_noun bov, gon;
|
|
|
|
#if 0
|
|
{
|
|
c3_c* oik_c = u3r_string(u3h(u3t(ovo)));
|
|
|
|
// uL(fprintf(uH, "lame: %s\n", oik_c));
|
|
free(oik_c);
|
|
}
|
|
#endif
|
|
|
|
// Formal error in a network packet generates a hole card.
|
|
//
|
|
// There should be a separate path for crypto failures,
|
|
// to prevent timing attacks, but isn't right now. To deal
|
|
// with a crypto failure, just drop the packet.
|
|
//
|
|
if ( (c3__exit == why) && (c3__hear == u3h(u3t(ovo))) ) {
|
|
u3_lo_punt(2, u3kb_flop(u3k(tan)));
|
|
|
|
bov = u3nc(u3k(u3h(ovo)), u3nc(c3__hole, u3k(u3t(u3t(ovo)))));
|
|
u3z(why);
|
|
u3z(tan);
|
|
}
|
|
else {
|
|
bov = u3nc(u3k(u3h(ovo)), u3nt(c3__crud, why, tan));
|
|
}
|
|
// u3_lo_show("data", u3k(u3t(u3t(ovo))));
|
|
|
|
u3z(ovo);
|
|
|
|
gon = u3m_soft(0, u3v_poke, u3k(bov));
|
|
|
|
if ( u3_blip == u3h(gon) ) {
|
|
_raft_sure(bov, u3k(u3h(u3t(gon))), u3k(u3t(u3t(gon))));
|
|
|
|
u3z(gon);
|
|
}
|
|
else {
|
|
u3z(gon);
|
|
{
|
|
u3_noun vab = u3nc(u3k(u3h(bov)),
|
|
u3nc(c3__warn, u3i_tape("crude crash!")));
|
|
u3_noun nog = u3m_soft(0, u3v_poke, u3k(vab));
|
|
|
|
if ( u3_blip == u3h(nog) ) {
|
|
_raft_sure(vab, u3k(u3h(u3t(nog))), u3k(u3t(u3t(nog))));
|
|
u3z(nog);
|
|
}
|
|
else {
|
|
u3z(nog);
|
|
u3z(vab);
|
|
|
|
uL(fprintf(uH, "crude: all delivery failed!\n"));
|
|
u3_lo_punt(2, u3kb_flop(u3k(tan)));
|
|
// c3_assert(!"crud");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* _raft_punk(): insert and apply an input ovum (unprotected).
|
|
*/
|
|
static void
|
|
_raft_punk(u3_noun ovo)
|
|
{
|
|
#ifdef GHETTO
|
|
c3_c* txt_c = u3r_string(u3h(u3t(ovo)));
|
|
#endif
|
|
c3_w sec_w;
|
|
// static c3_w num_w;
|
|
u3_noun gon;
|
|
|
|
// uL(fprintf(uH, "punk: %s: %d\n", u3r_string(u3h(u3t(ovo))), num_w++));
|
|
|
|
// XX this is wrong - the timer should be on the original hose.
|
|
//
|
|
if (c3__term == u3h(u3t(u3h(ovo)))) {
|
|
sec_w = 0;
|
|
} else sec_w = 600;
|
|
|
|
// Control alarm loops.
|
|
//
|
|
if ( c3__wake != u3h(u3t(ovo)) ) {
|
|
u3_Host.teh_u.run_w = 0;
|
|
}
|
|
|
|
#ifdef GHETTO
|
|
struct timeval b4, f2, d0;
|
|
gettimeofday(&b4, 0);
|
|
uL(fprintf(uH, "%%soft %s\n", txt_c));
|
|
#endif
|
|
|
|
gon = u3m_soft(sec_w, u3v_poke, u3k(ovo));
|
|
|
|
#ifdef GHETTO
|
|
c3_w ms_w;
|
|
|
|
gettimeofday(&f2, 0);
|
|
timersub(&f2, &b4, &d0);
|
|
ms_w = (d0.tv_sec * 1000) + (d0.tv_usec / 1000);
|
|
uL(fprintf(uH, "%%punk %s %d.%dms\n", txt_c, ms_w, (d0.tv_usec % 1000) / 10));
|
|
free(txt_c);
|
|
#endif
|
|
|
|
if ( u3_blip != u3h(gon) ) {
|
|
u3_noun why = u3k(u3h(gon));
|
|
u3_noun tan = u3k(u3t(gon));
|
|
|
|
u3z(gon);
|
|
_raft_lame(ovo, why, tan);
|
|
}
|
|
else {
|
|
u3_noun vir = u3k(u3h(u3t(gon)));
|
|
u3_noun cor = u3k(u3t(u3t(gon)));
|
|
u3_noun nug;
|
|
|
|
u3z(gon);
|
|
nug = u3v_nick(vir, cor);
|
|
|
|
if ( u3_blip != u3h(nug) ) {
|
|
u3_noun why = u3k(u3h(nug));
|
|
u3_noun tan = u3k(u3t(nug));
|
|
|
|
u3z(nug);
|
|
_raft_lame(ovo, why, tan);
|
|
}
|
|
else {
|
|
vir = u3k(u3h(u3t(nug)));
|
|
cor = u3k(u3t(u3t(nug)));
|
|
|
|
u3z(nug);
|
|
_raft_sure(ovo, vir, cor);
|
|
}
|
|
}
|
|
// uL(fprintf(uH, "punk oot %s\n", txt_c));
|
|
// free(txt_c);
|
|
}
|
|
|
|
|
|
static void
|
|
_raft_comm(c3_d bid_d)
|
|
{
|
|
u3p(u3v_cart) egg_p;
|
|
|
|
u3_lo_open();
|
|
|
|
egg_p = u3A->ova.egg_p;
|
|
while ( egg_p ) {
|
|
u3v_cart* egg_u = u3to(u3v_cart, egg_p);
|
|
|
|
if ( egg_u->ent_d <= bid_d ) {
|
|
egg_u->cit = c3y;
|
|
} else break;
|
|
|
|
egg_p = egg_u->nex_p;
|
|
}
|
|
u3_lo_shut(c3y);
|
|
}
|
|
|
|
static void
|
|
_raft_comm_cb(uv_timer_t* tim_u)
|
|
{
|
|
u3_raft* raf_u = tim_u->data;
|
|
|
|
_raft_comm(raf_u->ent_d);
|
|
}
|
|
|
|
|
|
static c3_d
|
|
_raft_push(u3_raft* raf_u, c3_w* bob_w, c3_w len_w)
|
|
{
|
|
c3_assert(raf_u->typ_e == u3_raty_lead);
|
|
c3_assert(0 != bob_w && 0 < len_w);
|
|
|
|
if ( 1 == raf_u->pop_w ) {
|
|
c3_assert(u3_raty_lead == raf_u->typ_e);
|
|
raf_u->ent_d = u3_sist_pack(raf_u->tem_w, c3__ov, bob_w, len_w);
|
|
raf_u->lat_w = raf_u->tem_w; // XX
|
|
|
|
if ( !uv_is_active((uv_handle_t*)&raf_u->tim_u) ) {
|
|
uv_timer_start(&raf_u->tim_u, _raft_comm_cb, 0, 0);
|
|
}
|
|
|
|
return raf_u->ent_d;
|
|
}
|
|
else {
|
|
// TODO
|
|
uL(fprintf(uH, "raft: multi-instance push\n"));
|
|
c3_assert(0);
|
|
}
|
|
}
|
|
|
|
|
|
/* _raft_kick_all(): kick a list of events, transferring.
|
|
*/
|
|
static void
|
|
_raft_kick_all(u3_noun vir)
|
|
{
|
|
while ( u3_nul != vir ) {
|
|
u3_noun ovo = u3k(u3h(vir));
|
|
u3_noun nex = u3k(u3t(vir));
|
|
u3z(vir); vir = nex;
|
|
|
|
u3_reck_kick(ovo);
|
|
}
|
|
}
|
|
|
|
int FOO;
|
|
|
|
/* u3_raft_work(): work.
|
|
*/
|
|
void
|
|
u3_raft_work(void)
|
|
{
|
|
if ( u3Z->typ_e != u3_raty_lead ) {
|
|
c3_assert(u3A->ova.egg_p == 0);
|
|
if ( u3_nul != u3A->roe ) {
|
|
uL(fprintf(uH, "raft: dropping roe!!\n"));
|
|
u3z(u3A->roe);
|
|
u3A->roe = u3_nul;
|
|
}
|
|
}
|
|
else {
|
|
u3_noun ova;
|
|
u3_noun vir;
|
|
u3_noun nex;
|
|
|
|
// Delete finished events.
|
|
//
|
|
while ( u3A->ova.egg_p ) {
|
|
u3p(u3v_cart) egg_p = u3A->ova.egg_p;
|
|
u3v_cart* egg_u = u3to(u3v_cart, u3A->ova.egg_p);
|
|
|
|
if ( c3y == egg_u->did ) {
|
|
vir = egg_u->vir;
|
|
|
|
if ( egg_p == u3A->ova.geg_p ) {
|
|
c3_assert(egg_u->nex_p == 0);
|
|
u3A->ova.geg_p = u3A->ova.egg_p = 0;
|
|
}
|
|
else {
|
|
c3_assert(egg_u->nex_p != 0);
|
|
u3A->ova.egg_p = egg_u->nex_p;
|
|
}
|
|
egg_u->cit = c3y;
|
|
u3a_free(egg_u);
|
|
}
|
|
else break;
|
|
}
|
|
|
|
// Poke pending events, leaving the poked events and errors on u3A->roe.
|
|
//
|
|
{
|
|
if ( 0 == u3Z->lug_u.len_d ) {
|
|
return;
|
|
}
|
|
ova = u3kb_flop(u3A->roe);
|
|
u3A->roe = u3_nul;
|
|
|
|
while ( u3_nul != ova ) {
|
|
_raft_punk(u3k(u3t(u3h(ova))));
|
|
c3_assert(u3_nul == u3h(u3h(ova)));
|
|
|
|
nex = u3k(u3t(ova));
|
|
u3z(ova); ova = nex;
|
|
}
|
|
}
|
|
|
|
// Cartify, jam, and encrypt this batch of events. Take a number, Raft will
|
|
// be with you shortly.
|
|
{
|
|
c3_d bid_d;
|
|
c3_w len_w;
|
|
c3_w* bob_w;
|
|
u3_noun ron;
|
|
u3_noun ovo;
|
|
|
|
ova = u3kb_flop(u3A->roe);
|
|
u3A->roe = u3_nul;
|
|
|
|
while ( u3_nul != ova ) {
|
|
ovo = u3k(u3t(u3h(ova)));
|
|
vir = u3k(u3h(u3h(ova)));
|
|
nex = u3k(u3t(ova));
|
|
u3z(ova); ova = nex;
|
|
|
|
if ( u3_nul != ovo ) {
|
|
u3v_cart* egg_u = u3a_malloc(sizeof(*egg_u));
|
|
u3p(u3v_cart) egg_p = u3of(u3v_cart, egg_u);
|
|
|
|
egg_u->nex_p = 0;
|
|
egg_u->cit = c3n;
|
|
egg_u->did = c3n;
|
|
egg_u->vir = vir;
|
|
|
|
ron = u3ke_jam(u3nc(u3k(u3A->now), ovo));
|
|
c3_assert(u3A->key);
|
|
ron = u3dc("en:crua", u3k(u3A->key), ron);
|
|
|
|
len_w = u3r_met(5, ron);
|
|
bob_w = c3_malloc(len_w * 4L);
|
|
u3r_words(0, len_w, bob_w, ron);
|
|
u3z(ron);
|
|
|
|
bid_d = _raft_push(u3Z, bob_w, len_w);
|
|
egg_u->ent_d = bid_d;
|
|
|
|
if ( 0 == u3A->ova.geg_p ) {
|
|
c3_assert(0 == u3A->ova.egg_p);
|
|
u3A->ova.geg_p = u3A->ova.egg_p = egg_p;
|
|
}
|
|
else {
|
|
c3_assert(0 == u3to(u3v_cart, u3A->ova.geg_p)->nex_p);
|
|
u3to(u3v_cart, u3A->ova.geg_p)->nex_p = egg_p;
|
|
u3A->ova.geg_p = egg_p;
|
|
}
|
|
_raft_kick_all(vir);
|
|
egg_u->did = c3y;
|
|
egg_u->vir = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|