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#include "../lib/legacy.h"
#include "../lib/runner.h"
/******************************************************************************
*
* Fixture
*
*****************************************************************************/
struct fixture
{
FIXTURE_CLUSTER;
};
static char *cluster_n[] = {"3", "5", "7", NULL};
static MunitParameterEnum _params[] = {
{CLUSTER_N_PARAM, cluster_n},
{NULL, NULL},
};
static void *setup(const MunitParameter params[], MUNIT_UNUSED void *user_data)
{
struct fixture *f = munit_malloc(sizeof *f);
SETUP_CLUSTER(0);
CLUSTER_BOOTSTRAP;
CLUSTER_RANDOMIZE;
CLUSTER_START();
CLUSTER_STEP_UNTIL_HAS_LEADER(10000);
return f;
}
static void tear_down(void *data)
{
struct fixture *f = data;
TEAR_DOWN_CLUSTER;
free(f);
}
/******************************************************************************
*
* Helper macros
*
*****************************************************************************/
#define APPLY_ADD_ONE(REQ) CLUSTER_APPLY_ADD_X(CLUSTER_LEADER, REQ, 1, NULL)
/******************************************************************************
*
* Tests
*
*****************************************************************************/
SUITE(replication)
/* New entries on the leader are eventually replicated to followers. */
TEST(replication, appendEntries, setup, tear_down, 0, _params)
{
struct fixture *f = data;
struct raft_apply *req = munit_malloc(sizeof *req);
(void)params;
APPLY_ADD_ONE(req);
CLUSTER_STEP_UNTIL_APPLIED(CLUSTER_N, 2, 2000);
free(req);
return MUNIT_OK;
}
/* The cluster remains available even if the current leader dies and a new
* leader gets elected. */
TEST(replication, availability, setup, tear_down, 0, _params)
{
struct fixture *f = data;
struct raft_apply *req1 = munit_malloc(sizeof *req1);
struct raft_apply *req2 = munit_malloc(sizeof *req2);
(void)params;
APPLY_ADD_ONE(req1);
CLUSTER_STEP_UNTIL_APPLIED(CLUSTER_N, 2, 2000);
CLUSTER_KILL_LEADER;
CLUSTER_STEP_UNTIL_HAS_NO_LEADER(10000);
CLUSTER_STEP_UNTIL_HAS_LEADER(10000);
APPLY_ADD_ONE(req2);
CLUSTER_STEP_UNTIL_APPLIED(CLUSTER_LEADER, 3, 2000);
free(req1);
free(req2);
return MUNIT_OK;
}
static void apply_cb(struct raft_apply *req, int status, void *result)
{
(void)status;
(void)result;
free(req);
}
/* If no quorum is available, entries don't get committed. */
TEST(replication, noQuorum, setup, tear_down, 0, _params)
{
struct fixture *f = data;
struct raft_apply *req = munit_malloc(sizeof *req);
unsigned i;
(void)params;
CLUSTER_APPLY_ADD_X(CLUSTER_LEADER, req, 1, apply_cb);
CLUSTER_KILL_MAJORITY;
CLUSTER_STEP_UNTIL_ELAPSED(10000);
for (i = 0; i < CLUSTER_N; i++) {
munit_assert_int(CLUSTER_LAST_APPLIED(i), ==, 1);
}
return MUNIT_OK;
}
/* If the cluster is partitioned, entries don't get committed. */
TEST(replication, partitioned, setup, tear_down, 0, _params)
{
struct fixture *f = data;
struct raft_apply *req1 = munit_malloc(sizeof *req1);
struct raft_apply *req2 = munit_malloc(sizeof *req2);
unsigned leader_id;
size_t i;
size_t n;
(void)params;
leader_id = CLUSTER_LEADER + 1;
/* Disconnect the leader from a majority of servers */
n = 0;
for (i = 0; n < (CLUSTER_N / 2) + 1; i++) {
struct raft *raft = CLUSTER_RAFT(i);
if (raft->id == leader_id) {
continue;
}
raft_fixture_saturate(&f->cluster, leader_id - 1, raft->id - 1);
raft_fixture_saturate(&f->cluster, raft->id - 1, leader_id - 1);
n++;
}
/* Try to append a new entry using the disconnected leader. */
CLUSTER_APPLY_ADD_X(CLUSTER_LEADER, req1, 1, apply_cb);
/* The leader gets deposed. */
CLUSTER_STEP_UNTIL_HAS_NO_LEADER(10000);
/* The entry does not get committed. */
CLUSTER_STEP_UNTIL_ELAPSED(5000);
/* Reconnect the old leader */
for (i = 0; i < CLUSTER_N; i++) {
struct raft *raft = CLUSTER_RAFT(i);
if (raft->id == leader_id) {
continue;
}
raft_fixture_desaturate(&f->cluster, leader_id - 1, raft->id - 1);
}
// TODO this fails with seed 0x3914306f
CLUSTER_STEP_UNTIL_HAS_LEADER(30000);
/* Re-try now to append the entry. */
CLUSTER_APPLY_ADD_X(CLUSTER_LEADER, req2, 1, apply_cb);
CLUSTER_STEP_UNTIL_APPLIED(CLUSTER_LEADER, 2, 10000);
return MUNIT_OK;
}
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