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/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "worker.h"
#include "log.h"
#include "options.h"
#include "trx.h"
#include "wsrep.h"
#include <assert.h>
#include <pthread.h>
#include <stdbool.h>
#include <string.h> // strerror()
struct node_worker
{
struct node_ctx* node;
pthread_t thread_id;
size_t id;
bool exit;
};
enum wsrep_cb_status
node_worker_apply_cb(void* const recv_ctx,
const wsrep_ws_handle_t* const ws_handle,
uint32_t const ws_flags,
const wsrep_buf_t* const ws,
const wsrep_trx_meta_t* const ws_meta,
wsrep_bool_t* const exit_loop)
{
assert(recv_ctx);
struct node_worker* const worker = recv_ctx;
wsrep_status_t const ret = node_trx_apply(
worker->node->store,
node_wsrep_provider(worker->node->wsrep),
ws_handle,
ws_meta,
ws_flags & WSREP_FLAG_ROLLBACK ? NULL : ws);
*exit_loop = worker->exit;
return WSREP_OK == ret ? WSREP_CB_SUCCESS : WSREP_CB_FAILURE;
}
static void*
worker_slave(void* recv_ctx)
{
struct node_worker* const worker = recv_ctx;
wsrep_t* const wsrep = node_wsrep_provider(worker->node->wsrep);
wsrep_status_t const ret = wsrep->recv(wsrep, worker);
if (WSREP_OK != ret)
{
NODE_ERROR("slave worker [%zu] exited with error %d.", worker->id, ret);
}
return NULL;
}
static void*
worker_master(void* send_ctx)
{
struct node_worker* const worker = send_ctx;
struct node_ctx* const node = worker->node;
wsrep_t* const wsrep = node_wsrep_provider(node->wsrep);
assert(node->opts->ws_size > 0);
wsrep_status_t ret;
do
{
/* REPLICATION: we should not perform any local writes until the node
* is synced with the cluster. */
if (!node_wsrep_wait_synced(node->wsrep))
{
NODE_ERROR("master worker [%zu] failed waiting for SYNCED state.",
worker->id);
break;
}
/* REPLICATION: the node is now synced */
do
{
ret = node_trx_execute(node->store,
wsrep,
worker->id,
(int)node->opts->operations);
}
while(WSREP_OK == ret // success
|| (WSREP_TRX_FAIL == ret // certification failed, trx rolled back
&& (usleep(10000),true)) // retry after short sleep
);
}
while (WSREP_CONN_FAIL == ret); // provider in bad state (e.g. non-Primary)
return NULL;
}
struct node_worker_pool
{
size_t size; // size of the pool (nu,ber of nodes)
struct node_worker worker[1]; // worker context array;
};
struct node_worker_pool*
node_worker_start(struct node_ctx* const ctx,
node_worker_type_t const type,
size_t const size)
{
assert(ctx);
if (0 == size) return NULL;
const char* const type_str = type == NODE_WORKER_SLAVE ? "slave" : "master";
size_t const alloc_size =
sizeof(struct node_worker_pool) +
sizeof(struct node_worker) * (size - 1);
struct node_worker_pool* const ret = malloc(alloc_size);
if (ret)
{
void* (* const routine) (void*) =
type == NODE_WORKER_SLAVE ? worker_slave : worker_master;
size_t i;
for (i = 0; i < size; i++)
{
struct node_worker* const worker = &ret->worker[i];
worker->node = ctx;
worker->id = i;
worker->exit = false;
int const err = pthread_create(&worker->thread_id,
NULL,
routine,
worker);
if (err)
{
NODE_ERROR("Failed to start %s worker[%zu]: %d (%s)",
type_str, i, err, strerror(err));
if (0 == i)
{
free(ret);
return NULL;
}
else
{
break; // some threads have started,
// need to return to close them first
}
}
}
ret->size = i;
}
else
{
NODE_ERROR("Failed to allocate %zu bytes for the %s worker pool",
alloc_size, type_str);
}
return ret;
}
void
node_worker_stop(struct node_worker_pool* pool)
{
size_t i;
for (i = 0; pool && i < pool->size; i++)
{
pthread_join(pool->worker[i].thread_id, NULL);
}
free(pool);
}
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