1 #include "osrf_prefork.h"
3 #include "osrf_app_session.h"
5 /* true if we just deleted a child. This will allow us to make sure we're
6 not trying to use freed memory */
10 void sigchld_handler( int sig );
12 int osrf_prefork_run(char* appname) {
14 if(!appname) fatal_handler("osrf_prefork_run requires an appname to run!");
16 set_proc_title( "opensrf listener [%s]", appname );
22 info_handler("Loading config in osrf_forker for app %s", appname);
24 jsonObject* max_req = osrf_settings_host_value_object("/apps/%s/unix_config/max_requests", appname);
25 jsonObject* min_children = osrf_settings_host_value_object("/apps/%s/unix_config/min_children", appname);
26 jsonObject* max_children = osrf_settings_host_value_object("/apps/%s/unix_config/max_children", appname);
28 if(!max_req) warning_handler("Max requests not defined, assuming 1000");
29 else maxr = (int) jsonObjectGetNumber(max_req);
31 if(!min_children) warning_handler("Min children not defined, assuming 3");
32 else minc = (int) jsonObjectGetNumber(min_children);
34 if(!max_children) warning_handler("Max children not defined, assuming 10");
35 else maxc = (int) jsonObjectGetNumber(max_children);
37 jsonObjectFree(max_req);
38 jsonObjectFree(min_children);
39 jsonObjectFree(max_children);
40 /* --------------------------------------------------- */
42 char* resc = va_list_to_string("%s_listener", appname);
44 if(!osrf_system_bootstrap_client_resc( NULL, NULL, resc ))
45 fatal_handler("Unable to bootstrap client for osrf_prefork_run()");
48 prefork_simple* forker = prefork_simple_init(
49 osrfSystemGetTransportClient(), maxr, minc, maxc);
51 forker->appname = strdup(appname);
54 fatal_handler("osrf_prefork_run() failed to create prefork_simple object");
56 prefork_launch_children(forker);
58 osrf_prefork_register_routers(appname);
60 info_handler("Launching osrf_forker for app %s", appname);
63 warning_handler("prefork_run() retuned - how??");
69 void osrf_prefork_register_routers( char* appname ) {
71 osrfStringArray* arr = osrfNewStringArray(4);
73 int c = osrfConfigGetValueList( NULL, arr, "/routers/router" );
74 char* routerName = osrfConfigGetValue( NULL, "/router_name" );
75 transport_client* client = osrfSystemGetTransportClient();
77 info_handler("router name is %s and we have %d routers to connect to", routerName, c );
80 char* domain = osrfStringArrayGetString(arr, --c);
83 char* jid = va_list_to_string( "%s@%s/router", routerName, domain );
84 info_handler("Registering with router %s", jid );
86 transport_message* msg = message_init("registering", NULL, NULL, jid, NULL );
87 message_set_router_info( msg, NULL, NULL, appname, "register", 0 );
89 client_send_message( client, msg );
96 osrfStringArrayFree(arr);
99 void prefork_child_init_hook(prefork_child* child) {
102 info_handler("Child init hook for child %d", child->pid);
103 char* resc = va_list_to_string("%s_drone",child->appname);
104 if(!osrf_system_bootstrap_client_resc( NULL, NULL, resc))
105 fatal_handler("Unable to bootstrap client for osrf_prefork_run()");
108 set_proc_title( "opensrf drone [%s]", child->appname );
111 void prefork_child_process_request(prefork_child* child, char* data) {
114 /* construct the message from the xml */
115 transport_message* msg = new_message_from_xml( data );
117 osrfAppSession* session = osrf_stack_transport_handler(msg, child->appname);
119 if( ! session->stateless ) { /* keepalive loop for stateful sessions */
121 debug_handler("Entering keepalive loop for session %s", session->session_id );
126 prefork_simple* prefork_simple_init( transport_client* client,
127 int max_requests, int min_children, int max_children ) {
129 if( min_children > max_children )
130 fatal_handler( "min_children (%d) is greater "
131 "than max_children (%d)", min_children, max_children );
133 if( max_children > ABS_MAX_CHILDREN )
134 fatal_handler( "max_children (%d) is greater than ABS_MAX_CHILDREN (%d)",
135 max_children, ABS_MAX_CHILDREN );
137 /* flesh out the struct */
138 prefork_simple* prefork = (prefork_simple*) safe_malloc(sizeof(prefork_simple));
139 prefork->max_requests = max_requests;
140 prefork->min_children = min_children;
141 prefork->max_children = max_children;
142 prefork->first_child = NULL;
143 prefork->connection = client;
148 prefork_child* launch_child( prefork_simple* forker ) {
154 /* Set up the data pipes and add the child struct to the parent */
155 if( pipe(data_fd) < 0 ) /* build the data pipe*/
156 fatal_handler( "Pipe making error" );
158 if( pipe(status_fd) < 0 ) /* build the status pipe */
159 fatal_handler( "Pipe making error" );
161 debug_handler( "Pipes: %d %d %d %d", data_fd[0], data_fd[1], status_fd[0], status_fd[1] );
162 prefork_child* child = prefork_child_init( forker->max_requests, data_fd[0],
163 data_fd[1], status_fd[0], status_fd[1] );
165 child->appname = strdup(forker->appname);
168 add_prefork_child( forker, child );
170 if( (pid=fork()) < 0 ) fatal_handler( "Forking Error" );
172 if( pid > 0 ) { /* parent */
174 signal(SIGCHLD, sigchld_handler);
175 (forker->current_num_children)++;
178 info_handler( "Parent launched %d", pid );
179 /* *no* child pipe FD's can be closed or the parent will re-use fd's that
180 the children are currently using */
186 debug_handler("I am new child with read_data_fd = %d and write_status_fd = %d",
187 child->read_data_fd, child->write_status_fd );
189 child->pid = getpid();
190 close( child->write_data_fd );
191 close( child->read_status_fd );
194 prefork_child_init_hook(child);
196 prefork_child_wait( child );
197 exit(0); /* just to be sure */
203 void prefork_launch_children( prefork_simple* forker ) {
206 while( c++ < forker->min_children )
207 launch_child( forker );
211 void sigchld_handler( int sig ) {
212 signal(SIGCHLD, sigchld_handler);
217 void reap_children( prefork_simple* forker ) {
222 while( (child_pid=waitpid(-1,&status,WNOHANG)) > 0)
223 del_prefork_child( forker, child_pid );
226 while( forker->current_num_children < forker->min_children )
227 launch_child( forker );
232 void prefork_run(prefork_simple* forker) {
234 if( forker->first_child == NULL )
237 transport_message* cur_msg = NULL;
242 if( forker->first_child == NULL ) {/* no more children */
243 warning_handler("No more children..." );
247 debug_handler("Forker going into wait for data...");
248 cur_msg = client_recv( forker->connection, -1 );
250 //fprintf(stderr, "Got Data %f\n", get_timestamp_millis() );
252 if( cur_msg == NULL ) continue;
254 int honored = 0; /* true if we've serviced the request */
258 check_children( forker );
260 debug_handler( "Server received inbound data" );
262 prefork_child* cur_child = forker->first_child;
264 /* Look for an available child */
265 for( k = 0; k < forker->current_num_children; k++ ) {
267 debug_handler("Searching for available child. cur_child->pid = %d", cur_child->pid );
268 debug_handler("Current num children %d and loop %d", forker->current_num_children, k);
270 if( cur_child->available ) {
271 debug_handler( "sending data to %d", cur_child->pid );
273 message_prepare_xml( cur_msg );
274 char* data = cur_msg->msg_xml;
275 if( ! data || strlen(data) < 1 ) break;
277 cur_child->available = 0;
278 debug_handler( "Writing to child fd %d", cur_child->write_data_fd );
281 //fprintf(stderr, "Writing Data %f\n", get_timestamp_millis() );
282 if( (written = write( cur_child->write_data_fd, data, strlen(data) + 1 )) < 0 ) {
283 warning_handler("Write returned error %d", errno);
284 cur_child = cur_child->next;
288 //fprintf(stderr, "Wrote %d bytes to child\n", written);
290 forker->first_child = cur_child->next;
294 cur_child = cur_child->next;
297 /* if none available, add a new child if we can */
299 debug_handler("Not enough children, attempting to add...");
300 if( forker->current_num_children < forker->max_children ) {
301 debug_handler( "Launching new child with current_num = %d",
302 forker->current_num_children );
304 prefork_child* new_child = launch_child( forker );
305 message_prepare_xml( cur_msg );
306 char* data = cur_msg->msg_xml;
307 if( ! data || strlen(data) < 1 ) break;
308 new_child->available = 0;
309 debug_handler( "sending data to %d", new_child->pid );
310 debug_handler( "Writing to new child fd %d", new_child->write_data_fd );
311 write( new_child->write_data_fd, data, strlen(data) + 1 );
312 forker->first_child = new_child->next;
318 warning_handler( "No children available, sleeping and looping..." );
319 usleep( 50000 ); /* 50 milliseconds */
323 reap_children(forker);
326 //fprintf(stderr, "Parent done with request %f\n", get_timestamp_millis() );
330 message_free( cur_msg );
332 } /* top level listen loop */
337 void check_children( prefork_simple* forker ) {
352 reap_children(forker);
354 prefork_child* cur_child = forker->first_child;
357 for( i = 0; i!= forker->current_num_children; i++ ) {
359 if( cur_child->read_status_fd > max_fd )
360 max_fd = cur_child->read_status_fd;
361 FD_SET( cur_child->read_status_fd, &read_set );
362 cur_child = cur_child->next;
365 FD_CLR(0,&read_set);/* just to be sure */
367 if( (select_ret=select( max_fd + 1 , &read_set, NULL, NULL, &tv)) == -1 ) {
368 warning_handler( "Select returned error %d on check_children", errno );
371 if( select_ret == 0 )
374 /* see if one of a child has told us it's done */
375 cur_child = forker->first_child;
378 for( j = 0; j!= forker->current_num_children && num_handled < select_ret ; j++ ) {
380 if( FD_ISSET( cur_child->read_status_fd, &read_set ) ) {
381 //printf( "Server received status from a child %d\n", cur_child->pid );
382 debug_handler( "Server received status from a child %d", cur_child->pid );
386 /* now suck off the data */
389 if( (n=read(cur_child->read_status_fd, buf, 63)) < 0 ) {
390 warning_handler("Read error afer select in child status read with errno %d", errno);
393 debug_handler( "Read %d bytes from status buffer: %s", n, buf );
394 cur_child->available = 1;
396 cur_child = cur_child->next;
402 void prefork_child_wait( prefork_child* child ) {
405 growing_buffer* gbuf = buffer_init( READ_BUFSIZE );
406 char buf[READ_BUFSIZE];
407 memset( buf, 0, READ_BUFSIZE );
409 for( i = 0; i!= child->max_requests; i++ ) {
412 clr_fl(child->read_data_fd, O_NONBLOCK );
413 while( (n=read(child->read_data_fd, buf, READ_BUFSIZE-1)) > 0 ) {
414 buffer_add( gbuf, buf );
415 memset( buf, 0, READ_BUFSIZE );
417 //fprintf(stderr, "Child read %d bytes\n", n);
419 if( n == READ_BUFSIZE ) {
420 //fprintf(stderr, "We read READ_BUFSIZE data....\n");
422 /* either we have exactly READ_BUFSIZE data,
423 or there's more waiting that we need to grab*/
424 /* must set to non-block for reading more */
426 //fprintf(stderr, "Read Data %f\n", get_timestamp_millis() );
427 prefork_child_process_request(child, gbuf->buf);
428 buffer_reset( gbuf );
434 warning_handler( "Child read returned error with errno %d", errno );
438 if( i < child->max_requests - 1 )
439 write( child->write_status_fd, "available" /*less than 64 bytes*/, 9 );
444 debug_handler("Child exiting...[%d]", getpid() );
450 void add_prefork_child( prefork_simple* forker, prefork_child* child ) {
452 if( forker->first_child == NULL ) {
453 forker->first_child = child;
458 /* we put the child in as the last because, regardless,
459 we have to do the DLL splice dance, and this is the
462 prefork_child* start_child = forker->first_child;
464 if( forker->first_child->next == start_child )
466 forker->first_child = forker->first_child->next;
469 /* here we know that forker->first_child is the last element
470 in the list and start_child is the first. Insert the
471 new child between them*/
473 forker->first_child->next = child;
474 child->next = start_child;
478 prefork_child* find_prefork_child( prefork_simple* forker, pid_t pid ) {
480 if( forker->first_child == NULL ) { return NULL; }
481 prefork_child* start_child = forker->first_child;
483 if( forker->first_child->pid == pid )
484 return forker->first_child;
485 } while( (forker->first_child = forker->first_child->next) != start_child );
491 void del_prefork_child( prefork_simple* forker, pid_t pid ) {
493 if( forker->first_child == NULL ) { return; }
495 (forker->current_num_children)--;
496 debug_handler("Deleting Child: %d", pid );
498 prefork_child* start_child = forker->first_child; /* starting point */
499 prefork_child* cur_child = start_child; /* current pointer */
500 prefork_child* prev_child = start_child; /* the trailing pointer */
502 /* special case where there is only one in the list */
503 if( start_child == start_child->next ) {
504 if( start_child->pid == pid ) {
505 forker->first_child = NULL;
507 close( start_child->read_data_fd );
508 close( start_child->write_data_fd );
509 close( start_child->read_status_fd );
510 close( start_child->write_status_fd );
512 prefork_child_free( start_child );
518 /* special case where the first item in the list needs to be removed */
519 if( start_child->pid == pid ) {
521 /* find the last one so we can remove the start_child */
523 prev_child = cur_child;
524 cur_child = cur_child->next;
525 }while( cur_child != start_child );
527 /* now cur_child == start_child */
528 prev_child->next = cur_child->next;
529 forker->first_child = prev_child;
531 close( cur_child->read_data_fd );
532 close( cur_child->write_data_fd );
533 close( cur_child->read_status_fd );
534 close( cur_child->write_status_fd );
536 prefork_child_free( cur_child );
541 prev_child = cur_child;
542 cur_child = cur_child->next;
544 if( cur_child->pid == pid ) {
545 prev_child->next = cur_child->next;
547 close( cur_child->read_data_fd );
548 close( cur_child->write_data_fd );
549 close( cur_child->read_status_fd );
550 close( cur_child->write_status_fd );
552 prefork_child_free( cur_child );
556 } while(cur_child != start_child);
562 prefork_child* prefork_child_init(
563 int max_requests, int read_data_fd, int write_data_fd,
564 int read_status_fd, int write_status_fd ) {
566 prefork_child* child = (prefork_child*) safe_malloc(sizeof(prefork_child));
567 child->max_requests = max_requests;
568 child->read_data_fd = read_data_fd;
569 child->write_data_fd = write_data_fd;
570 child->read_status_fd = read_status_fd;
571 child->write_status_fd = write_status_fd;
572 child->available = 1;
578 int prefork_free( prefork_simple* prefork ) {
580 while( prefork->first_child != NULL ) {
581 info_handler( "Killing children and sleeping 1 to reap..." );
586 client_free(prefork->connection);
587 free(prefork->appname);
592 int prefork_child_free( prefork_child* child ) {
593 free(child->appname);
594 close(child->read_data_fd);
595 close(child->write_status_fd);