2 * vim:ts=2:sw=2:expandtab
6 #include "xbt/sysdep.h"
9 static int closest_preceding_node(int id);
10 static void check_predecessor(void);
12 XBT_LOG_NEW_DEFAULT_CATEGORY(chord,"Messages specific to this example");
14 typedef enum msg_typus{
24 /*GRAS_DEFINE_TYPE(s_pbio,
31 typedef struct s_pbio pbio_t;*/
33 /*GRAS_DEFINE_TYPE(s_ping,*/
38 typedef struct s_ping ping_t;
40 /*GRAS_DEFINE_TYPE(s_pong,*/
46 typedef struct s_pong pong_t;
48 GRAS_DEFINE_TYPE(s_notify,
55 typedef struct s_notify notify_t;
57 GRAS_DEFINE_TYPE(s_get_suc,
62 typedef struct s_get_suc get_suc_t;
64 GRAS_DEFINE_TYPE(s_rep_suc,
71 typedef struct s_rep_suc rep_suc_t;
73 typedef struct finger_elem{
81 static void register_messages(){
82 /* gras_msgtype_declare("chord",gras_datadesc_by_symbol(s_pbio));*/
83 gras_msgtype_declare("chord_get_suc",gras_datadesc_by_symbol(s_get_suc));
84 gras_msgtype_declare("chord_rep_suc",gras_datadesc_by_symbol(s_rep_suc));
85 gras_msgtype_declare("chord_notify",gras_datadesc_by_symbol(s_notify));
88 /* Global private data */
90 gras_socket_t sock; /* server socket on which I'm listening */
91 int id; /* my id number */
92 char host[1024]; /* my host name */
93 int port; /* port on which I'm listening FIXME */
94 int fingers; /* how many fingers */
95 finger_elem *finger; /* finger table */
96 int next_to_fix; /* next in the finger list to be checked */
97 int pre_id; /* predecessor id */
98 char pre_host[1024]; /* predecessor host */
99 int pre_port; /* predecessor port */
103 int node(int argc,char **argv);
105 /*static int node_cb_chord_handler(gras_socket_t expeditor,void *payload_data){
107 pbio_t pbio_i=*(pbio_t*)payload_data;
109 node_data_t *globals=(node_data_t*)gras_userdata_get();
111 INFO4(">>> %d : received %d message from %s to %d <<<",globals->id,pbio_i.type,gras_socket_peer_name(expeditor),pbio_i.dest);
117 static int node_cb_get_suc_handler(gras_msg_cb_ctx_t ctx,void *payload_data){
118 gras_socket_t expeditor=gras_msg_cb_ctx_from(ctx);
120 get_suc_t incoming=*(get_suc_t*)payload_data;
122 node_data_t *globals=(node_data_t*)gras_userdata_get();
123 INFO2("Received a get_successor message from %s for %d",
124 gras_socket_peer_name(expeditor),incoming.id);
125 if((globals->id==globals->finger[0].id)||
126 (incoming.id>globals->id&&incoming.id<=globals->finger[0].id)){
127 outgoing.id=globals->finger[0].id;
128 snprintf(outgoing.host,1024,globals->finger[0].host);
129 outgoing.port=globals->finger[0].port;
130 INFO0("My successor is his successor!");
132 gras_socket_t temp_sock;
133 int contact=closest_preceding_node(incoming.id);
135 outgoing.id=globals->finger[0].id;
136 snprintf(outgoing.host,1024,globals->finger[0].host);
137 outgoing.port=globals->finger[0].port;
138 INFO0("My successor is his successor!");
140 get_suc_t asking;asking.id=incoming.id;
142 temp_sock=gras_socket_client(globals->finger[contact].host,
143 globals->finger[contact].port);
145 RETHROW0("Unable to connect!: %s");
148 gras_msg_send(temp_sock,"chord_get_suc",&asking);
150 RETHROW0("Unable to ask!: %s");
152 gras_msg_wait(10.,"chord_rep_suc",&temp_sock, &outgoing);
157 gras_msg_send(expeditor,"chord_rep_suc",&outgoing);
158 INFO0("Successor information sent!");
160 RETHROW2("%s:Timeout sending successor information to %s: %s",
161 globals->host,gras_socket_peer_name(expeditor));
163 gras_socket_close(expeditor);
167 static int closest_preceding_node(int id){
168 node_data_t *globals=(node_data_t*)gras_userdata_get();
170 for(i=globals->fingers-1;i>=0;i--){
171 if(globals->finger[i].id>globals->id&&globals->finger[i].id<id){
179 static int node_cb_notify_handler(gras_msg_cb_ctx_t ctx,void *payload_data){
180 gras_socket_t expeditor=gras_msg_cb_ctx_from(ctx);
182 notify_t incoming=*(notify_t*)payload_data;
183 node_data_t *globals=(node_data_t*)gras_userdata_get();
184 INFO2("Received a notifying message from %s as %d",
185 gras_socket_peer_name(expeditor),incoming.id);
186 if(globals->pre_id==-1||
187 (incoming.id>globals->pre_id&&incoming.id<globals->id)){
188 globals->pre_id=incoming.id;
189 snprintf(globals->pre_host,1024,incoming.host);
190 globals->pre_port=incoming.port;
191 INFO0("Set as my new predecessor!");
196 static void fix_fingers(){
197 get_suc_t get_suc_msg;
199 gras_socket_t temp_sock=NULL;
200 gras_socket_t temp_sock2=NULL;
201 rep_suc_t rep_suc_msg;
202 node_data_t *globals=(node_data_t*)gras_userdata_get();
205 temp_sock=gras_socket_client(globals->host,globals->port);
207 RETHROW0("Unable to contact known host: %s");
210 get_suc_msg.id=globals->id;
212 gras_msg_send(temp_sock,"chord_get_suc",&get_suc_msg);
214 gras_socket_close(temp_sock);
215 RETHROW0("Unable to contact known host to get successor!: %s");
219 INFO0("Waiting for reply!");
220 gras_msg_wait(6000,"chord_rep_suc",&temp_sock2, &rep_suc_msg);
222 RETHROW1("%s: Error waiting for successor:%s",globals->host);
224 globals->finger[0].id=rep_suc_msg.id;
225 snprintf(globals->finger[0].host,1024,rep_suc_msg.host);
226 globals->finger[0].port=rep_suc_msg.port;
227 INFO1("→ Finger %d fixed!",globals->next_to_fix);
228 gras_socket_close(temp_sock);
230 globals->next_to_fix=(++globals->next_to_fix==globals->fingers)?
231 0:globals->next_to_fix;
234 static void check_predecessor(){
235 node_data_t *globals = (node_data_t*)gras_userdata_get();
236 gras_socket_t temp_sock;
240 if (globals->pre_id == -1){
244 temp_sock = gras_socket_client( globals->pre_host, globals->pre_port );
246 globals->pre_id = -1;
247 globals->pre_host[0] = 0;
248 globals->pre_port = 0;
253 gras_msg_send( temp_sock, "chord_ping",&ping);
255 globals->pre_id = -1;
256 globals->pre_host[0] = 0;
257 globals->pre_port = 0;
260 gras_msg_wait( 60, "chord_pong", &temp_sock, &pong);
262 globals->pre_id = -1;
263 globals->pre_host[0] = 0;
264 globals->pre_port = 0;
266 gras_socket_close(temp_sock);
269 int node(int argc,char **argv){
270 node_data_t *globals=NULL;
271 gras_socket_t temp_sock=NULL;
272 gras_socket_t temp_sock2=NULL;
273 get_suc_t get_suc_msg;
274 rep_suc_t rep_suc_msg;
284 /* 1. Init the GRAS infrastructure and declare my globals */
285 gras_init(&argc,argv);
287 gras_os_sleep((15-gras_os_getpid())*20);
289 globals=gras_userdata_new(node_data_t);
291 globals->id=atoi(argv[1]);
292 globals->port=atoi(argv[2]);
294 globals->finger=NULL;
296 globals->pre_host[0]=0;
297 globals->pre_port=-1;
299 snprintf(globals->host,1024,gras_os_myname());
304 asprintf(&other_host,"%s",argv[3]);
305 other_port=atoi(argv[4]);
308 globals->sock=gras_socket_server(globals->port);
313 globals->finger=(finger_elem*)calloc(1,sizeof(finger_elem));
314 INFO2("Launching node %s:%d",globals->host,globals->port);
316 INFO0("→Creating ring");
317 globals->finger[0].id=globals->id;
318 snprintf(globals->finger[0].host,1024,globals->host);
319 globals->finger[0].port=globals->port;
321 INFO2("→Known node %s:%d",other_host,other_port);
322 INFO0("→Contacting to determine successor");
324 temp_sock=gras_socket_client(other_host,other_port);
326 RETHROW0("Unable to contact known host: %s");
329 get_suc_msg.id=globals->id;
331 gras_msg_send(temp_sock,"chord_get_suc", &get_suc_msg);
333 gras_socket_close(temp_sock);
334 RETHROW0("Unable to contact known host to get successor!: %s");
338 INFO0("Waiting for reply!");
339 gras_msg_wait(10.,"chord_rep_suc",&temp_sock2, &rep_suc_msg);
341 RETHROW1("%s: Error waiting for successor:%s",globals->host);
343 globals->finger[0].id=rep_suc_msg.id;
344 snprintf(globals->finger[0].host,1024,rep_suc_msg.host);
345 globals->finger[0].port=rep_suc_msg.port;
346 INFO3("→Got successor : %d-%s:%d",globals->finger[0].id,
347 globals->finger[0].host,globals->finger[0].port);
348 gras_socket_close(temp_sock);
350 temp_sock=gras_socket_client(globals->finger[0].host,
351 globals->finger[0].port);
353 RETHROW0("Unable to contact successor: %s");
356 notify_msg.id=globals->id;
357 snprintf(notify_msg.host,1024,globals->host);
358 notify_msg.port=globals->port;
360 gras_msg_send(temp_sock,"chord_notify",¬ify_msg);
362 RETHROW0("Unable to notify successor! %s");
366 gras_cb_register("chord_get_suc", &node_cb_get_suc_handler);
367 gras_cb_register("chord_notify", &node_cb_notify_handler);
368 /*gras_cb_register("chord_ping",&node_cb_ping_handler);*/
369 /* gras_timer_repeat(600.,fix_fingers);*/
374 gras_msg_handle(6000000.0);
380 gras_socket_close(globals->sock);