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File:  [GForge:cvsroot/nutss] / libnutss / examples / slinks_variable_load.c
Revision 1.20: download - view: text, annotated - select for diffs
Wed Jul 11 04:31:46 2007 UTC (10 years, 2 months ago) by ths
Branches: MAIN
CVS tags: HEAD
more tweaks to slinks reg and to test harness, now able to run several dozen nodes without any hitches

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef WIN32
#include <poll.h>
#include <sys/socket.h>
#endif
#include <pthread.h>
#include "../include/swaplinks.h"

#ifdef WIN32
#define sleep(sec) Sleep((sec)*1000)
#define snprintf   _snprintf
#endif

#define randint(N) ((int)(rand() / (((double)RAND_MAX + 1) / (N))))
#define assert(p) if(!(p)) { printf("Assertion '%s' FAILED!\n", #p); exit(1); }
#define REDUNDANCY (4*(100/percent))

int count_char(char*,char);

typedef struct flow {
    int duration;
    int weight;
    char source[256];
    struct flow *next, *last;
} flow_t;

int num, peers, limit, maxload;
swaplinks_p swp;
FILE *f = NULL, *s = NULL, *g = NULL;

void *recvthread(void *arg) {
    swaplinks_p swp = (swaplinks_p)arg;
    struct sockaddr_ns peer;
    socklen_t len = sizeof(peer);
    flow_t *flows = NULL, *newflow = NULL, *ptr = NULL, *axe = NULL;
    char msg[64], tmp[128], buf[2048];
    int time = 0, load = 0, exts, delta, expiration;

    buf[0] = 0;

    while(time < limit) {
		if(swaplinks_recvfrom(swp, tmp, sizeof(tmp), 0, &peer, &len) > 0) {
			time++; delta = 0;
			// parse new flow
			newflow = (flow_t*)calloc(1,sizeof(flow_t));
			newflow->duration = atoi(strtok(tmp,";"));
			newflow->weight = atoi(strtok(NULL,";"));
			exts = atoi(strtok(NULL,";"));
			strncpy(newflow->source,peer.user+4,sizeof(newflow->source));
			if(s) fprintf(s,"      %d recvd request #%d from %s - w:%d d:%d\n",
				      num,time,newflow->source,newflow->weight,newflow->duration);
			snprintf(buf,2048,"->%d:%d:%s<->",newflow->duration,newflow->weight,newflow->source);
			// run through flows, decrementing duration, cleaning any expired flows
			for(ptr = flows; ptr;) {
				sprintf(buf,"%s%d:%d<->",buf,ptr->duration,ptr->weight);
				expiration = 0; axe = NULL;
				if(--ptr->duration == 0) {
					axe = ptr;
					load -= ptr->weight;
					delta -= ptr->weight;
					if(ptr->last && ptr->next) {
						assert(flows != ptr);
						ptr->last->next = ptr->next;
						ptr->next->last = ptr->last;
					}
					else if(ptr->next) {
						assert(flows == ptr);
						ptr->next->last = NULL;
						flows = ptr->next;
					}
					else if(ptr->last) {
						assert(flows != ptr);
						ptr->last->next = NULL;
					}
					else {
						assert(flows == ptr);
						flows = NULL;
					}
		//		    if(s) fprintf(s,"%d EXPIRED FLOW from %s:d%d/w%d\n",num,ptr->source,ptr->duration,ptr->weight);
					expiration = 1;
				}
				ptr = ptr->next;
				if(expiration) { free(axe); axe = NULL; }
			}
			sprintf(buf,"%s||\n",buf);

		//          if(s) fprintf(s,"%d ACCEPTED FLOW from %s:d%d/w%d\n",num,newflow->source,newflow->duration,newflow->weight);
			// if this flow will not put us overbudget, accept
			if(load+newflow->weight <= maxload) {
				load += newflow->weight;
				delta += newflow->weight;
				newflow->next = flows;
				if(flows) flows->last = newflow;
				flows = newflow;
				if(s) fprintf(s,"        %d accepted flow: %d\n",num,load);
			}
			// ADMISSION CONTROL
			// if we're overloaded, drop it if its been pushed too far,
			// otherwise pass on to a neighbor and mark it
			else if(exts < 5) {
				fprintf(s,"        %d rejected flow, load too high: %d <= %d\n",num,maxload,load+newflow->weight);
				swaplinks_update_walk_length(swp,1);
				snprintf(msg,64,"%d;%d;%d;",newflow->duration,newflow->weight,exts+1);
				swaplinks_sendtoany(swp,msg,strlen(msg)+1,0);
				swaplinks_update_walk_length(swp,peers);
			}
			else
				fprintf(s,"        %d retired unserviceable request\n",num);

			if(f) fprintf(f,"%d\n",load);
//			if(s) fprintf(s,"%s",buf);
		}
	}
	if(s) fprintf(s,"%d DONE RECEIVING\n",num);

	// clean up
	if(f && f != stderr) { fclose(f); f = NULL; }
	if(s && s != stdout) { fclose(s); s = NULL; }
	for(ptr = flows;ptr;) {axe = ptr; ptr = ptr->next; free(axe);}

	pthread_exit(NULL);
}

int main(int argc, char **argv) {
    struct sockaddr_ns reg;
    char tmp[256], nbrs[4096];
    int time = 0, duration, weight, percent, sendcount = 0;
    pthread_t tid;

    if (argc > 6) {
        num = atoi(argv[1]);
        peers = atoi(argv[2]);
        limit = atoi(argv[3]);
	percent = atoi(argv[4]);
        duration = atoi(argv[5]);
        weight = atoi(argv[6]);
        maxload = atoi(argv[7]);
    }
    else {
        printf("Usage:\n  slinks_variable_load node_number peers_number time_limit percent_to_send flow_duration flow_weight max_load\n");
        exit(1);
    }

    snprintf(tmp, sizeof(tmp), "test%d", num);
    nutss_config_set(NUTSS_CONFIG_USERNAME, tmp, strlen(tmp));
    nutss_config_set(NUTSS_CONFIG_PROXYUSERNAME, tmp, strlen(tmp));
    nutss_config_set(NUTSS_CONFIG_PROXYPASSWORD, tmp, strlen(tmp));
    strncpy(tmp, "nutss.net", sizeof(tmp));
    nutss_config_set(NUTSS_CONFIG_DOMAINNAME, tmp, strlen(tmp));
    strncpy(tmp, "sip.nutss.net:5060", sizeof(tmp));
    nutss_config_set(NUTSS_CONFIG_SIGPROXY, tmp, strlen(tmp));

    sprintf(tmp, "output/data_node%d.txt", num); f = fopen(tmp,"w");
//    sprintf(tmp, "output/output_node%d.txt", num); s = fopen(tmp,"w");
    sprintf(tmp, "output/nbrs_node%d.txt", num); g = fopen(tmp,"w");
    if (f == NULL) f = stderr;
    if (s == NULL) s = stdout;

    memset(&reg, 0, sizeof(reg));
    reg.family = AF_NUTSS;
    strncpy(reg.user, "ths1", sizeof(reg.user));
    strncpy(reg.domain, "nutss.net", sizeof(reg.domain));
    strncpy(reg.service, "swaplinksd", sizeof(reg.service));

    swaplinks_init();

//    sleep(randint(5));

    swp = swaplinks_new("cloud9", &reg, peers, peers);

    // let swaplinks get going.
    sleep(5);

    pthread_create(&tid, NULL, recvthread, swp);

//    sleep(2);

    snprintf(tmp, sizeof(tmp), "%d;%d;0;", duration, weight);

    while (time++ < REDUNDANCY*limit) { // (i-- != 0) {
        if(randint(100) < percent) swaplinks_sendtoany(swp, tmp, strlen(tmp)+1, 0);
//      if(s) fprintf(s,"   %d sent request %d\n",num,time);
	swaplinks_get_neighbors(swp, nbrs, 4096);
	if(g) fprintf(g,"%d\n",count_char(nbrs,','));
        nbrs[0] = 0;
	sleep(1);
    }

    if(g) fclose(g);
    if(s) fprintf(s,"%d DONE SENDING\n",num);
    pthread_join(tid, NULL);
    if(s) fprintf(s,"%d SHUTTING DOWN\n",num);

//    if(num == 1) system("echo \" \" | mail -s\"node one finished sending!\" ths22@cs.cornell.edu");

    return 0;
}

int count_char(char *s, char h) {
    int i, l = strlen(s), c = 0;
    for(i = 0; i < l; i++)
        if(s[i] == h) c++;
    return c;
}

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