ctdb/tcp/tcp_init.c

   1 /*
   2    ctdb over TCP
   3
   4    Copyright (C) Andrew Tridgell  2006
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "replace.h"
  21 #include "system/network.h"
  22 #include "system/filesys.h"
  23
  24 #include <talloc.h>
  25 #include <tevent.h>
  26
  27 #include "lib/util/time.h"
  28 #include "lib/util/debug.h"
  29
  30 #include "ctdb_private.h"
  31
  32 #include "common/common.h"
  33 #include "common/logging.h"
  34
  35 #include "ctdb_tcp.h"
  36
  37 static int tnode_destructor(struct ctdb_tcp_node *tnode)
  38 {
  39   //    struct ctdb_node *node = talloc_find_parent_bytype(tnode, struct ctdb_node);
  40
  41         if (tnode->fd != -1) {
  42                 close(tnode->fd);
  43                 tnode->fd = -1;
  44         }
  45
  46         return 0;
  47 }
  48
  49 /*
  50   initialise tcp portion of a ctdb node
  51 */
  52 static int ctdb_tcp_add_node(struct ctdb_node *node)
  53 {
  54         struct ctdb_tcp_node *tnode;
  55         tnode = talloc_zero(node, struct ctdb_tcp_node);
  56         CTDB_NO_MEMORY(node->ctdb, tnode);
  57
  58         tnode->fd = -1;
  59         node->private_data = tnode;
  60         talloc_set_destructor(tnode, tnode_destructor);
  61
  62         tnode->out_queue = ctdb_queue_setup(node->ctdb, node, tnode->fd, CTDB_TCP_ALIGNMENT,
  63                                             ctdb_tcp_tnode_cb, node, "to-node-%s", node->name);
  64
  65         return 0;
  66 }
  67
  68 /*
  69   initialise transport structures
  70 */
  71 static int ctdb_tcp_initialise(struct ctdb_context *ctdb)
  72 {
  73         int i;
  74
  75         /* listen on our own address */
  76         if (ctdb_tcp_listen(ctdb) != 0) {
  77                 DEBUG(DEBUG_CRIT, (__location__ " Failed to start listening on the CTDB socket\n"));
  78                 exit(1);
  79         }
  80
  81         for (i=0; i < ctdb->num_nodes; i++) {
  82                 if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) {
  83                         continue;
  84                 }
  85                 if (ctdb_tcp_add_node(ctdb->nodes[i]) != 0) {
  86                         DEBUG(DEBUG_CRIT, ("methods->add_node failed at %d\n", i));
  87                         return -1;
  88                 }
  89         }
  90
  91         return 0;
  92 }
  93
  94 /*
  95   start the protocol going
  96 */
  97 static int ctdb_tcp_connect_node(struct ctdb_node *node)
  98 {
  99         struct ctdb_context *ctdb = node->ctdb;
 100         struct ctdb_tcp_node *tnode = talloc_get_type(
 101                 node->private_data, struct ctdb_tcp_node);
 102
 103         /* startup connection to the other server - will happen on
 104            next event loop */
 105         if (!ctdb_same_address(ctdb->address, &node->address)) {
 106                 tnode->connect_te = tevent_add_timer(ctdb->ev, tnode,
 107                                                     timeval_zero(),
 108                                                     ctdb_tcp_node_connect,
 109                                                     node);
 110         }
 111
 112         return 0;
 113 }
 114
 115 /*
 116   shutdown and try to restart a connection to a node after it has been
 117   disconnected
 118 */
 119 static void ctdb_tcp_restart(struct ctdb_node *node)
 120 {
 121         struct ctdb_tcp_node *tnode = talloc_get_type(
 122                 node->private_data, struct ctdb_tcp_node);
 123
 124         DEBUG(DEBUG_NOTICE,("Tearing down connection to dead node :%d\n", node->pnn));
 125
 126         ctdb_tcp_stop_connection(node);
 127
 128         tnode->connect_te = tevent_add_timer(node->ctdb->ev, tnode,
 129                                              timeval_zero(),
 130                                              ctdb_tcp_node_connect, node);
 131 }
 132
 133
 134 /*
 135   shutdown the transport
 136 */
 137 static void ctdb_tcp_shutdown(struct ctdb_context *ctdb)
 138 {
 139         struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data,
 140                                                 struct ctdb_tcp);
 141         talloc_free(ctcp);
 142         ctdb->private_data = NULL;
 143 }
 144
 145 /*
 146   start the transport
 147 */
 148 static int ctdb_tcp_start(struct ctdb_context *ctdb)
 149 {
 150         int i;
 151
 152         for (i=0; i < ctdb->num_nodes; i++) {
 153                 if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) {
 154                         continue;
 155                 }
 156                 ctdb_tcp_connect_node(ctdb->nodes[i]);
 157         }
 158
 159         return 0;
 160 }
 161
 162
 163 /*
 164   transport packet allocator - allows transport to control memory for packets
 165 */
 166 static void *ctdb_tcp_allocate_pkt(TALLOC_CTX *mem_ctx, size_t size)
 167 {
 168         /* tcp transport needs to round to 8 byte alignment to ensure
 169            that we can use a length header and 64 bit elements in
 170            structures */
 171         size = (size+(CTDB_TCP_ALIGNMENT-1)) & ~(CTDB_TCP_ALIGNMENT-1);
 172         return talloc_size(mem_ctx, size);
 173 }
 174
 175
 176 static const struct ctdb_methods ctdb_tcp_methods = {
 177         .initialise   = ctdb_tcp_initialise,
 178         .start        = ctdb_tcp_start,
 179         .queue_pkt    = ctdb_tcp_queue_pkt,
 180         .add_node     = ctdb_tcp_add_node,
 181         .connect_node = ctdb_tcp_connect_node,
 182         .allocate_pkt = ctdb_tcp_allocate_pkt,
 183         .shutdown     = ctdb_tcp_shutdown,
 184         .restart      = ctdb_tcp_restart,
 185 };
 186
 187 static int tcp_ctcp_destructor(struct ctdb_tcp *ctcp)
 188 {
 189         ctcp->ctdb->private_data = NULL;
 190         ctcp->ctdb->methods = NULL;
 191
 192         return 0;
 193 }
 194
 195
 196 /*
 197   initialise tcp portion of ctdb
 198 */
 199 int ctdb_tcp_init(struct ctdb_context *ctdb)
 200 {
 201         struct ctdb_tcp *ctcp;
 202         ctcp = talloc_zero(ctdb, struct ctdb_tcp);
 203         CTDB_NO_MEMORY(ctdb, ctcp);
 204
 205         ctcp->listen_fd = -1;
 206         ctcp->ctdb      = ctdb;
 207         ctdb->private_data = ctcp;
 208         ctdb->methods = &ctdb_tcp_methods;
 209
 210         talloc_set_destructor(ctcp, tcp_ctcp_destructor);
 211         return 0;
 212 }
 213