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utun2/tests/test_db_sync.c

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// test_db_sync.c — sync protocol test: peer_empty, hash_MATCH, divergence merge
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <time.h>
#include <sys/stat.h>
#include "../lib/platform_compat.h"
#include "test_utils.h"
#ifdef _WIN32
#include <windows.h>
#include <direct.h>
#else
#include <unistd.h>
#endif
#include "etcp.h"
#include "etcp_connections.h"
#include "../src/config_parser.h"
#include "../src/config_updater.h"
#include "../src/utun_instance.h"
#include "routing.h"
#include "../src/tun_if.h"
#include "secure_channel.h"
#include "secure_channel.h"
#include "../src/db_sync.h"
#include "../lib/u_async.h"
#include "../lib/debug_config.h"
#include "../lib/mem.h"
#define TEST_TIMEOUT_TB 120000 // 12s
#define PHASE_TIMEOUT_TB 100000 // 10s per phase
#define POLL_INTERVAL_MS 1
static struct UTUN_INSTANCE* inst_a = NULL;
static struct UTUN_INSTANCE* inst_b = NULL;
static struct UTUN_INSTANCE* inst_c = NULL;
static struct DB_SYNC_INSTANCE* si_a = NULL;
static struct DB_SYNC_INSTANCE* si_b = NULL;
static struct DB_SYNC_INSTANCE* si_c = NULL;
static struct UASYNC* ua = NULL;
static int test_phase = 0;
static void* timeout_id = NULL;
static char temp_dir[] = "/tmp/utun_dbsync_XXXXXX";
static char config_a[256], config_b[256], config_c[256];
static int port_a_srv, port_b_srv, port_c_srv;
static int write_file(const char* path, const char* fmt, ...) {
va_list ap; FILE* f = fopen(path, "w");
if (!f) return -1;
va_start(ap, fmt); vfprintf(f, fmt, ap); va_end(ap);
fclose(f); return 0;
}
static char* get_pubkey(const char* path) {
struct utun_config* cfg = parse_config(path);
if (!cfg) return NULL;
char* pub = strdup(cfg->global.my_public_key_hex);
free_config(cfg); return pub;
}
static int create_temp_configs(void) {
if (test_mkdtemp(temp_dir) != 0) { fprintf(stderr, "mkdtemp failed\n"); return -1; }
int base = 42000 + (getpid() % 15000);
port_a_srv = base; port_b_srv = base + 1; port_c_srv = base + 2;
snprintf(config_a, sizeof(config_a), "%s/a.conf", temp_dir);
snprintf(config_b, sizeof(config_b), "%s/b.conf", temp_dir);
snprintf(config_c, sizeof(config_c), "%s/c.conf", temp_dir);
char db_path[320];
snprintf(db_path, sizeof(db_path), "%s/db_a", temp_dir); utun_mkdir(db_path, 0755);
snprintf(db_path, sizeof(db_path), "%s/db_b", temp_dir); utun_mkdir(db_path, 0755);
snprintf(db_path, sizeof(db_path), "%s/db_c", temp_dir); utun_mkdir(db_path, 0755);
write_file(config_a,
"[global]\nmy_node_id=0xAAAAAAAAAAAAAAAA\ntun_ip=10.200.0.1/24\n"
"tun_ifname=tun200\nkeepalive_adaptive=0\ndb_path=%s/db_a\ndb_sync_enabled=1\n\n"
"[server: srv_a]\naddr=127.0.0.1:%d\ntype=public\n\n"
"[allowed_keys]\nallow_all=1\n", temp_dir, port_a_srv);
config_ensure_keys_and_node_id(config_a);
char* pub_a = get_pubkey(config_a); if (!pub_a) { fprintf(stderr, "pub_a fail\n"); return -1; }
write_file(config_b,
"[global]\nmy_node_id=0xBBBBBBBBBBBBBBBB\ntun_ip=10.200.0.2/24\n"
"tun_ifname=tun201\nkeepalive_adaptive=0\ndb_path=%s/db_b\ndb_sync_enabled=1\n\n"
"[server: srv_b]\naddr=127.0.0.1:%d\ntype=public\n\n"
"[client: to_a]\nkeepalive=1\npeer_public_key=%s\nlink=srv_b:127.0.0.1:%d\n\n"
"[allowed_keys]\nallow_all=1\n", temp_dir, port_b_srv, pub_a, port_a_srv);
write_file(config_c,
"[global]\nmy_node_id=0xCCCCCCCCCCCCCCCC\ntun_ip=10.200.0.3/24\n"
"tun_ifname=tun202\nkeepalive_adaptive=0\ndb_path=%s/db_c\ndb_sync_enabled=1\n\n"
"[server: srv_c]\naddr=127.0.0.1:%d\ntype=public\n\n"
"[client: to_a]\nkeepalive=1\npeer_public_key=%s\nlink=srv_c:127.0.0.1:%d\n\n"
"[allowed_keys]\nallow_all=1\n", temp_dir, port_c_srv, pub_a, port_a_srv);
free(pub_a);
config_ensure_keys_and_node_id(config_b);
config_ensure_keys_and_node_id(config_c);
return 0;
}
static void cleanup_temp_configs(void) {
unlink(config_a); unlink(config_b); unlink(config_c);
char pa[320];
snprintf(pa, sizeof(pa), "%s/db_a/chats.db", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_a/chats.db-wal", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_a/chats.db-shm", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_b/chats.db", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_b/chats.db-wal", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_b/chats.db-shm", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_c/chats.db", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_c/chats.db-wal", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_c/chats.db-shm", temp_dir); unlink(pa);
snprintf(pa, sizeof(pa), "%s/db_a", temp_dir); test_rmdir(pa);
snprintf(pa, sizeof(pa), "%s/db_b", temp_dir); test_rmdir(pa);
snprintf(pa, sizeof(pa), "%s/db_c", temp_dir); test_rmdir(pa);
test_rmdir(temp_dir);
}
static void test_timeout(void* arg) { (void)arg; test_phase = 2; }
static int wait_for(const char* desc, int (*cond)(void), int timeout_tb) {
uint64_t start = get_time_tb();
while (!cond() && (get_time_tb() - start) < (uint64_t)timeout_tb && test_phase == 0)
uasync_poll(ua, POLL_INTERVAL_MS);
if (cond()) return 1;
if (test_phase == 0) { fprintf(stderr, "TIMEOUT: %s\n", desc); test_phase = 2; }
return 0;
}
static int cond_links_init(void) {
if (!inst_a || !inst_b) return 0;
struct ll_entry* e = inst_a->connections->head;
int links = 0;
while (e) { struct conn_queue_entry* ce = (struct conn_queue_entry*)e->data;
struct ETCP_LINK* l = ce->conn->links; while (l) { if (l->initialized) links++; l = l->next; }
e = e->next; }
return links >= (inst_c ? 2 : 1);
}
static uint32_t ca_target, cb_target, cc_target;
static int _cond_ca(void) { return si_a && db_sync_count(si_a) == ca_target; }
static int _cond_cb(void) { return si_b && db_sync_count(si_b) == cb_target; }
static int _cond_cc(void) { return si_c && db_sync_count(si_c) == cc_target; }
static int _cond_both(void) { return _cond_ca() && _cond_cb(); }
static int _cond_all(void) { return _cond_ca() && _cond_cb() && _cond_cc(); }
static int insert_many(struct DB_SYNC_INSTANCE* si, struct UTUN_INSTANCE* inst, int start, int count) {
char buf[128];
for (int i = start; i < start + count && test_phase == 0; i++) {
snprintf(buf, sizeof(buf), "{\"idx\":%d,\"val\":\"data_%d\"}", i, i);
uint64_t ts = db_sync_next_timestamp(si);
uint8_t sig_msg[256]; size_t off = 0;
memcpy(sig_msg + off, &ts, 8); off += 8;
size_t jl = strlen(buf); memcpy(sig_msg + off, buf, jl); off += jl;
uint8_t sig[64];
if (sc_ed25519_sign(inst->my_ed25519_privkey, sig_msg, off, sig) != SC_OK) { fprintf(stderr,"sign fail\n"); return -1; }
if (db_sync_insert_signed(si, buf, jl, sig, 64, ts) < 0) { fprintf(stderr,"insert fail\n"); return -1; }
}
return 0;
}
static void remove_si(struct DB_SYNC_INSTANCE** psi) {
if (*psi) { db_sync_instance_remove(*psi); *psi = NULL; }
}
int main(void) {
printf("=== test_db_sync ===\n");
debug_config_init(); debug_set_level(DEBUG_LEVEL_ERROR);
debug_set_category_level(DEBUG_CATEGORY_DB_SYNC, DEBUG_LEVEL_DEBUG);
if (create_temp_configs() != 0) { cleanup_temp_configs(); return 1; }
utun_instance_set_tun_init_enabled(0);
ua = uasync_create(); if (!ua) { cleanup_temp_configs(); return 1; }
inst_a = utun_instance_create(ua, config_a);
inst_b = utun_instance_create(ua, config_b);
if (!inst_a || !inst_b || utun_instance_init(inst_a) != 0 || utun_instance_init(inst_b) != 0)
{ fprintf(stderr, "init fail\n"); cleanup_temp_configs(); return 1; }
timeout_id = uasync_set_timeout(ua, TEST_TIMEOUT_TB, NULL, test_timeout, "global_timeout");
if (!wait_for("links up", cond_links_init, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
// ===================================================================
// Phase 1: peer_empty. add_quiet (no auto-sync) → insert A=5,
// reinitiate → INIT_SYNC(5) → B INIT_RESP(ch8=0,sc=0) → A sends all 5.
// ===================================================================
printf("Phase 1: peer_empty\n");
si_a = db_sync_instance_add(inst_a, "test", 1, 0);
si_b = db_sync_instance_add(inst_b, "test", 1, 0);
if (!si_a || !si_b) { test_phase = 2; goto done; }
if (insert_many(si_a, inst_a, 0, 5) != 0) { test_phase = 2; goto done; }
db_sync_reinitiate(si_b, inst_a->node_id);
cb_target = 5;
if (!wait_for("B=5", _cond_cb, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_count(si_b) != 5 || db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b))
{ test_phase = 2; goto done; }
printf(" PASS\n");
// ===================================================================
// Phase 2: hash_MATCH tail-send. Insert 3 more on A (PUSH disabled —
// si_a from phase 1 has sync_state=2? No, reinitiate set it to 1, then
// SYNC_DONE set it to 2. Disable PUSH, insert, reinitiate.
// ===================================================================
printf("Phase 2: hash_MATCH tail-send\n");
db_sync_peer_set_state(si_a, inst_b->node_id, 0);
if (insert_many(si_a, inst_a, 5, 3) != 0) { test_phase = 2; goto done; }
db_sync_reinitiate(si_b, inst_a->node_id);
cb_target = 8;
if (!wait_for("B=8", _cond_cb, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_count(si_b) != 8 || db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b))
{ test_phase = 2; goto done; }
printf(" PASS\n");
// ===================================================================
// Phase 3: divergence merge. remove si, add_quiet → insert A=3 B=2 →
// reinitiate both → divergence → REFINE merge to 5.
// ===================================================================
printf("Phase 3: divergence merge\n");
remove_si(&si_a); remove_si(&si_b);
si_a = db_sync_instance_add(inst_a, "test2", 2, 0);
si_b = db_sync_instance_add(inst_b, "test2", 2, 0);
if (!si_a || !si_b) { test_phase = 2; goto done; }
if (insert_many(si_a, inst_a, 0, 3) != 0 || insert_many(si_b, inst_b, 10, 2) != 0)
{ test_phase = 2; goto done; }
db_sync_reinitiate(si_b, inst_a->node_id);
ca_target = 5; cb_target = 5;
if (!wait_for("both=5", _cond_both, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b)) { test_phase = 2; goto done; }
printf(" PASS\n");
// ===================================================================
// Phase 4: divergence merge. remove si, add_quiet → insert A=2 B=2 →
// reinitiate both → merge to 4.
// ===================================================================
printf("Phase 4: divergence merge 2\n");
remove_si(&si_a); remove_si(&si_b);
si_a = db_sync_instance_add(inst_a, "test_div", 30, 0);
si_b = db_sync_instance_add(inst_b, "test_div", 30, 0);
if (!si_a || !si_b) { test_phase = 2; goto done; }
if (insert_many(si_a, inst_a, 0, 2) != 0 || insert_many(si_b, inst_b, 10, 2) != 0)
{ test_phase = 2; goto done; }
db_sync_reinitiate(si_b, inst_a->node_id);
ca_target = 4; cb_target = 4;
if (!wait_for("both=4", _cond_both, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b)) { test_phase = 2; goto done; }
printf(" PASS\n");
// ===================================================================
// Phase 5: PUSH not-at-tail. Use db_sync_instance_add (normal, with auto-sync)
// so PUSH fires. Insert early timestamp record → PUSH → cascade_from.
// ===================================================================
printf("Phase 5: PUSH not-at-tail\n");
remove_si(&si_a); remove_si(&si_b);
si_a = db_sync_instance_add(inst_a, "push_t", 40, 1);
si_b = db_sync_instance_add(inst_b, "push_t", 40, 1);
if (!si_a || !si_b) { test_phase = 2; goto done; }
if (insert_many(si_a, inst_a, 0, 2) != 0) { test_phase = 2; goto done; }
cb_target = 2;
if (!wait_for("seed=2", _cond_cb, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
{ char ebuf[64]; snprintf(ebuf, sizeof(ebuf), "{\"idx\":\"early\",\"val\":\"not_at_tail\"}");
uint64_t early_ts = 500; uint8_t msg[256]; size_t moff = 0;
memcpy(msg + moff, &early_ts, 8); moff += 8;
size_t jl = strlen(ebuf); memcpy(msg + moff, ebuf, jl); moff += jl;
uint8_t sig[64];
if (sc_ed25519_sign(inst_a->my_ed25519_privkey, msg, moff, sig) != SC_OK
|| db_sync_insert_signed(si_a, ebuf, jl, sig, 64, early_ts) != 0)
{ test_phase = 2; goto done; }
}
ca_target = 3; cb_target = 3;
if (!wait_for("both=3", _cond_both, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b)) { test_phase = 2; goto done; }
printf(" PASS\n");
// ===================================================================
// Phase 6: triple star — cascade notification.
// ===================================================================
printf("Phase 6: triple star\n");
remove_si(&si_a); remove_si(&si_b);
inst_c = utun_instance_create(ua, config_c);
if (!inst_c || utun_instance_init(inst_c) != 0) { fprintf(stderr, "inst_c fail\n"); test_phase = 2; goto done; }
if (!wait_for("C links up", cond_links_init, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
si_a = db_sync_instance_add(inst_a, "triple", 70, 0);
si_b = db_sync_instance_add(inst_b, "triple", 70, 0);
si_c = db_sync_instance_add(inst_c, "triple", 70, 0);
if (!si_a || !si_b || !si_c) { test_phase = 2; goto done; }
if (insert_many(si_a, inst_a, 0, 2) != 0 || insert_many(si_b, inst_b, 10, 1) != 0
|| insert_many(si_c, inst_c, 20, 1) != 0) { test_phase = 2; goto done; }
db_sync_reinitiate(si_b, inst_a->node_id);
db_sync_reinitiate(si_c, inst_a->node_id);
ca_target = 4; cb_target = 4; cc_target = 4;
if (!wait_for("all=4", _cond_all, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b) || db_sync_chain_verify(si_c))
{ test_phase = 2; goto done; }
printf(" merge=4 PASS\n");
// 6b: PUSH at tail on A → delivered to B and C via PUSH (sync_state >=1 after merge).
if (insert_many(si_a, inst_a, 30, 1) != 0) { test_phase = 2; goto done; }
ca_target = 5; cb_target = 5; cc_target = 5;
if (!wait_for("all=5 (tail PUSH)", _cond_all, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b) || db_sync_chain_verify(si_c))
{ test_phase = 2; goto done; }
printf(" tail PUSH=5 PASS\n");
// 6c: PUSH not-at-tail on A → delivered to B and C → cascade_from, synced_pos reset.
{
char ebuf[64]; snprintf(ebuf, sizeof(ebuf), "{\"idx\":\"mid\",\"val\":\"triple_insert\"}");
uint64_t early_ts = 500; uint8_t msg[256]; size_t moff = 0;
memcpy(msg + moff, &early_ts, 8); moff += 8;
size_t jl = strlen(ebuf); memcpy(msg + moff, ebuf, jl); moff += jl;
uint8_t sig[64];
if (sc_ed25519_sign(inst_a->my_ed25519_privkey, msg, moff, sig) != SC_OK
|| db_sync_insert_signed(si_a, ebuf, jl, sig, 64, early_ts) != 0)
{ test_phase = 2; goto done; }
}
ca_target = 6; cb_target = 6; cc_target = 6;
if (!wait_for("all=6 (mid PUSH cascade)", _cond_all, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
if (db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b) || db_sync_chain_verify(si_c))
{ test_phase = 2; goto done; }
printf(" mid PUSH cascade=6 PASS\n");
// ===================================================================
// Phase 7: randomized triple — cold start divergence, live PUSH,
// disconnect/reconnect with additional random inserts.
// ===================================================================
printf("Phase 7: randomized triple\n");
remove_si(&si_a); remove_si(&si_b); remove_si(&si_c);
srand((unsigned)time(NULL));
printf("seed=%u\n", (unsigned)time(NULL));
si_a = db_sync_instance_add(inst_a, "rnd_triple", 80, 0);
si_b = db_sync_instance_add(inst_b, "rnd_triple", 80, 0);
si_c = db_sync_instance_add(inst_c, "rnd_triple", 80, 0);
if (!si_a || !si_b || !si_c) { test_phase = 2; goto done; }
// -- Round 1: cold start divergence merge with 0..20 random records per peer --
int r1_a = rand() % 2, r1_b = rand() % 2, r1_c = rand() % 2;
int total = r1_a + r1_b + r1_c;
printf(" R1: A=%d B=%d C=%d (total=%d)\n", r1_a, r1_b, r1_c, total);
if ((r1_a > 0 && insert_many(si_a, inst_a, 0, r1_a) != 0)
|| (r1_b > 0 && insert_many(si_b, inst_b, 100, r1_b) != 0)
|| (r1_c > 0 && insert_many(si_c, inst_c, 200, r1_c) != 0)) { test_phase = 2; goto done; }
db_sync_reinitiate(si_b, inst_a->node_id);
db_sync_reinitiate(si_c, inst_a->node_id);
ca_target = cb_target = cc_target = (uint32_t)total;
if (!wait_for("R1 converge", _cond_all, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
{
uint64_t ha, hb, hc;
if (db_sync_last_chain_hash8(si_a, &ha) || db_sync_last_chain_hash8(si_b, &hb)
|| db_sync_last_chain_hash8(si_c, &hc) || ha != hb || hb != hc) { test_phase = 2; goto done; }
if (db_sync_chain_verify(si_a) || db_sync_chain_verify(si_b) || db_sync_chain_verify(si_c)) { test_phase = 2; goto done; }
}
printf(" R1 PASS (%u records)\n", ca_target);
// -- Round 2: live PUSH — 20 records on random peer, verify convergence --
{
int r2_peer = rand() % 3;
struct DB_SYNC_INSTANCE* pick = (r2_peer == 0) ? si_a : (r2_peer == 1) ? si_b : si_c;
struct UTUN_INSTANCE* pick_inst = (r2_peer == 0) ? inst_a : (r2_peer == 1) ? inst_b : inst_c;
const char* pick_name = (r2_peer == 0) ? "A" : (r2_peer == 1) ? "B" : "C";
printf(" R2: +5 on peer %s\n", pick_name);
if (insert_many(pick, pick_inst, 300, 5) != 0) { test_phase = 2; goto done; }
ca_target = cb_target = cc_target = (uint32_t)(total + 5);
if (!wait_for("R2 converge", _cond_all, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
uint64_t ha, hb, hc;
if (db_sync_last_chain_hash8(si_a, &ha) || db_sync_last_chain_hash8(si_b, &hb)
|| db_sync_last_chain_hash8(si_c, &hc) || ha != hb || hb != hc) { test_phase = 2; goto done; }
printf(" R2 PASS (%u records)\n", ca_target);
total += 5;
}
// -- Round 3: simulate disconnect (reset sync state), add random records, reinitiate, sync --
printf(" R3: disconnect/reset sync state, insert random, reinitiate\n");
db_sync_peer_set_state(si_a, inst_b->node_id, 0); db_sync_peer_set_state(si_a, inst_c->node_id, 0);
db_sync_peer_set_state(si_b, inst_a->node_id, 0);
db_sync_peer_set_state(si_c, inst_a->node_id, 0);
int r3_a = rand() % 2, r3_b = rand() % 2, r3_c = rand() % 2;
total += r3_a + r3_b + r3_c;
printf(" R3: A=%d B=%d C=%d (total=%d)\n", r3_a, r3_b, r3_c, total);
if ((r3_a > 0 && insert_many(si_a, inst_a, 400, r3_a) != 0)
|| (r3_b > 0 && insert_many(si_b, inst_b, 500, r3_b) != 0)
|| (r3_c > 0 && insert_many(si_c, inst_c, 600, r3_c) != 0)) { test_phase = 2; goto done; }
db_sync_reinitiate(si_b, inst_a->node_id);
db_sync_reinitiate(si_c, inst_a->node_id);
ca_target = cb_target = cc_target = (uint32_t)total;
if (!wait_for("R3 converge", _cond_all, PHASE_TIMEOUT_TB)) { test_phase = 2; goto done; }
{
uint64_t ha, hb, hc;
if (db_sync_last_chain_hash8(si_a, &ha) || db_sync_last_chain_hash8(si_b, &hb)
|| db_sync_last_chain_hash8(si_c, &hc) || ha != hb || hb != hc) { test_phase = 2; goto done; }
}
printf(" R3 PASS (%u records)\n", ca_target);
done:
remove_si(&si_a); remove_si(&si_b); remove_si(&si_c);
if (timeout_id && ua) { uasync_cancel_timeout(ua, timeout_id); timeout_id = NULL; }
if (inst_c) { inst_c->running = 0; utun_instance_destroy(inst_c); inst_c = NULL; }
if (inst_b) { inst_b->running = 0; utun_instance_destroy(inst_b); inst_b = NULL; }
if (inst_a) { inst_a->running = 0; utun_instance_destroy(inst_a); inst_a = NULL; }
if (ua) { uasync_destroy(ua, 0); ua = NULL; }
cleanup_temp_configs();
if (test_phase == 0) test_phase = 1;
printf("=== %s ===\n", test_phase == 1 ? "PASS" : "FAIL");
return test_phase == 1 ? 0 : 1;
}