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/*
ctdb over TCP
Copyright (C) Andrew Tridgell 2006
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; either version 3 of the License, or
(at your option) any later version.
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, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/network.h"
#include "system/filesys.h"
#include <talloc.h>
#include <tevent.h>
#include "lib/util/time.h"
#include "lib/util/debug.h"
#include "ctdb_private.h"
#include "common/common.h"
#include "common/logging.h"
#include "ctdb_tcp.h"
static int tnode_destructor(struct ctdb_tcp_node *tnode)
{
// struct ctdb_node *node = talloc_find_parent_bytype(tnode, struct ctdb_node);
if (tnode->out_fd != -1) {
close(tnode->out_fd);
tnode->out_fd = -1;
}
return 0;
}
/*
initialise tcp portion of a ctdb node
*/
static int ctdb_tcp_add_node(struct ctdb_node *node)
{
struct ctdb_tcp_node *tnode;
tnode = talloc_zero(node, struct ctdb_tcp_node);
CTDB_NO_MEMORY(node->ctdb, tnode);
tnode->out_fd = -1;
tnode->ctdb = node->ctdb;
node->private_data = tnode;
talloc_set_destructor(tnode, tnode_destructor);
return 0;
}
/*
initialise transport structures
*/
static int ctdb_tcp_initialise(struct ctdb_context *ctdb)
{
int i;
/* listen on our own address */
if (ctdb_tcp_listen(ctdb) != 0) {
DEBUG(DEBUG_CRIT, (__location__ " Failed to start listening on the CTDB socket\n"));
exit(1);
}
for (i=0; i < ctdb->num_nodes; i++) {
if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) {
continue;
}
if (ctdb_tcp_add_node(ctdb->nodes[i]) != 0) {
DEBUG(DEBUG_CRIT, ("methods->add_node failed at %d\n", i));
return -1;
}
}
return 0;
}
/*
start the protocol going
*/
static int ctdb_tcp_connect_node(struct ctdb_node *node)
{
struct ctdb_context *ctdb = node->ctdb;
struct ctdb_tcp_node *tnode = talloc_get_type(
node->private_data, struct ctdb_tcp_node);
/* startup connection to the other server - will happen on
next event loop */
if (!ctdb_same_address(ctdb->address, &node->address)) {
tnode->connect_te = tevent_add_timer(ctdb->ev, tnode,
timeval_zero(),
ctdb_tcp_node_connect,
node);
}
return 0;
}
/*
shutdown and try to restart a connection to a node after it has been
disconnected
*/
static void ctdb_tcp_restart(struct ctdb_node *node)
{
struct ctdb_tcp_node *tnode = talloc_get_type(
node->private_data, struct ctdb_tcp_node);
DEBUG(DEBUG_NOTICE,("Tearing down connection to dead node :%d\n", node->pnn));
ctdb_tcp_stop_connection(node);
tnode->connect_te = tevent_add_timer(node->ctdb->ev, tnode,
timeval_zero(),
ctdb_tcp_node_connect, node);
}
/*
shutdown the transport
*/
static void ctdb_tcp_shutdown(struct ctdb_context *ctdb)
{
struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data,
struct ctdb_tcp);
uint32_t i;
talloc_free(ctcp);
ctdb->private_data = NULL;
for (i=0; i<ctdb->num_nodes; i++) {
TALLOC_FREE(ctdb->nodes[i]->private_data);
}
}
/*
start the transport
*/
static int ctdb_tcp_start(struct ctdb_context *ctdb)
{
int i;
for (i=0; i < ctdb->num_nodes; i++) {
if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) {
continue;
}
ctdb_tcp_connect_node(ctdb->nodes[i]);
}
return 0;
}
/*
transport packet allocator - allows transport to control memory for packets
*/
static void *ctdb_tcp_allocate_pkt(TALLOC_CTX *mem_ctx, size_t size)
{
/* tcp transport needs to round to 8 byte alignment to ensure
that we can use a length header and 64 bit elements in
structures */
size = (size+(CTDB_TCP_ALIGNMENT-1)) & ~(CTDB_TCP_ALIGNMENT-1);
return talloc_size(mem_ctx, size);
}
static const struct ctdb_methods ctdb_tcp_methods = {
.initialise = ctdb_tcp_initialise,
.start = ctdb_tcp_start,
.queue_pkt = ctdb_tcp_queue_pkt,
.add_node = ctdb_tcp_add_node,
.connect_node = ctdb_tcp_connect_node,
.allocate_pkt = ctdb_tcp_allocate_pkt,
.shutdown = ctdb_tcp_shutdown,
.restart = ctdb_tcp_restart,
};
static int tcp_ctcp_destructor(struct ctdb_tcp *ctcp)
{
ctcp->ctdb->private_data = NULL;
ctcp->ctdb->methods = NULL;
return 0;
}
/*
initialise tcp portion of ctdb
*/
int ctdb_tcp_init(struct ctdb_context *ctdb)
{
struct ctdb_tcp *ctcp;
ctcp = talloc_zero(ctdb, struct ctdb_tcp);
CTDB_NO_MEMORY(ctdb, ctcp);
ctcp->listen_fd = -1;
ctcp->ctdb = ctdb;
ctdb->private_data = ctcp;
ctdb->methods = &ctdb_tcp_methods;
talloc_set_destructor(ctcp, tcp_ctcp_destructor);
return 0;
}
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