nlanr/tr-stat.cc

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// Generate statistics from UCB traces
// All we need to know: 
// 
// (1) client request streams: 
//     <time> <clientID> <serverID> <URL_ID> 
// (2) server page mod stream(s):
//     <serverID> <URL_ID> <PageSize> <access times>
//
// Part of the code comes from Steven Gribble's UCB trace parse codes
// 
// $Header: /nfs/jade/vint/CVSROOT/ns-2/indep-utils/webtrace-conv/nlanr/tr-stat.cc,v 1.3 2005/09/18 23:33:33 tomh Exp $

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <tcl.h>

#include "logparse.h"

Tcl_HashTable cidHash;  // Client id (IP, port) hash
int client = 0;     // client sequence number

Tcl_HashTable sidHash;  // server id (IP, port) hash
int server = 0;     // server sequence number

Tcl_HashTable urlHash;  // URL id hash
int url = 0;        // URL sequence number
int* umap;      // URL mapping table, used for url sort
struct URL {
    URL(int i, int sd, int sz) : access(1), id(i), sid(sd), size(sz) {}
    int access; // access counts
    int id;
    int sid, size;
};

FILE *cf, *sf;
double initTime = -1;
double duration = -1;
double startTime = -1;

struct ReqLog {
    ReqLog() {}
    ReqLog(double t, unsigned int c, unsigned int s, unsigned int u) :
        time(t), cid(c), sid(s), url(u) {}
    double time;
    unsigned int cid, sid, url;
};
ReqLog* rlog = NULL;
unsigned int num_rlog = 0, sz_rlog = 0;

int compare(const void *a1, const void *b1)
{
    const ReqLog *a = (const ReqLog*)a1, *b = (const ReqLog*)b1;
    return (a->time > b->time) ? 1 : 
        (a->time == b->time) ? 0 : -1;
}

void sort_rlog()
{
    qsort((void *)rlog, num_rlog, sizeof(ReqLog), compare);
    double t = rlog[0].time;
    for (unsigned int i = 0; i < num_rlog; i++) {
        rlog[i].time -= t;
        fprintf(cf, "%f %d %d %d\n", rlog[i].time, 
            rlog[i].cid, rlog[i].sid, umap[rlog[i].url]);
    }
    delete []umap;
    // Record trace duration and # of unique urls
    fprintf(cf, "i %f %u\n", rlog[num_rlog-1].time, url);
}

int compare_url(const void* a1, const void* b1)
{
    const URL **a = (const URL**)a1, **b = (const URL**)b1;
    return ((*a)->access > (*b)->access) ? -1:
        ((*a)->access == (*b)->access) ? 0 : 1;
}

void sort_url()
{
    // XXX use an interval member of Tcl_HashTable
    URL** tbl = new URL*[urlHash.numEntries];
    Tcl_HashEntry *he;
    Tcl_HashSearch hs;
    int i = 0, sz = urlHash.numEntries;
    for (he = Tcl_FirstHashEntry(&urlHash, &hs);
         he != NULL;
         he = Tcl_NextHashEntry(&hs))
        tbl[i++] = (URL*)Tcl_GetHashValue(he);
    Tcl_DeleteHashTable(&urlHash);

    // sort using access frequencies
    qsort((void *)tbl, sz, sizeof(URL*), compare_url);
    umap = new int[url];
    // write sorted url to page table
    for (i = 0; i < sz; i++) {
        umap[tbl[i]->id] = i;
        fprintf(sf, "%d %d %d %u\n", tbl[i]->sid, i,
            tbl[i]->size, tbl[i]->access);
        delete tbl[i];
    }
    delete []tbl;
}

double lf_analyze(lf_entry& lfe)
{
    double time;
    int ne, cid, sid, uid;
    Tcl_HashEntry *he;

    time = lfe.rt;

    if (initTime < 0) {
        initTime = time;
        time = 0;
    } else 
        time -= initTime;

    // If a trace start time is required, don't do anything
    if ((startTime > 0) && (time < startTime)) 
        return -1;

    // Ignore pages with size 0
    if (lfe.size == 0) 
        return -1;

    // check client id
    long clientKey = lfe.cid;
    if (!(he = Tcl_FindHashEntry(&cidHash, (const char *)clientKey))) {
        // new client, allocate a client id
        he = Tcl_CreateHashEntry(&cidHash, (const char *)clientKey, &ne);
        Tcl_SetHashValue(he, (long)++client);
        cid = client;
    } else {
        // existing entry, find its client seqno
        cid = (long)Tcl_GetHashValue(he);
    }

    // check server id
    if (!(he = Tcl_FindHashEntry(&sidHash, lfe.sid))) {
        // new server, assign a server id
        he = Tcl_CreateHashEntry(&sidHash, lfe.sid, &ne);
        server++;
        long serverValue = server;
        Tcl_SetHashValue(he, serverValue);
        sid = server;
    } else {
        // existing entry, find its client seqno
        sid = (long)Tcl_GetHashValue(he);
    }

    // check url id
    if (!(he = Tcl_FindHashEntry(&urlHash, lfe.url))) {
        // new client, allocate a client id
        he = Tcl_CreateHashEntry(&urlHash, lfe.url, &ne);
        URL* u = new URL(++url, sid, lfe.size);
        Tcl_SetHashValue(he, (const char*)u);
        uid = u->id;
        //fprintf(sf, "%d %d %ld\n", sid, u->id, lfe.rhl+lfe.rdl);
    } else {
        // existing entry, find its client seqno
        URL* u = (URL*)Tcl_GetHashValue(he);
        u->access++;
        uid = u->id;
    }

    rlog[num_rlog++] = ReqLog(time, cid, sid, uid);
    //fprintf(cf, "%f %d %d %d\n", time, cid, sid, uid);

    if (startTime > 0) 
        return time - startTime;
    else 
        return time;
}

int main(int argc, char**argv)
{
    lf_entry lfntree;
    int      ret;
    double   ctime;

    // Init tcl
    Tcl_Interp *interp = Tcl_CreateInterp();
    if (Tcl_Init(interp) == TCL_ERROR) {
        printf("%s\n", interp->result);
        abort();
    }
    Tcl_InitHashTable(&cidHash, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(&sidHash, TCL_STRING_KEYS);
    Tcl_InitHashTable(&urlHash, TCL_STRING_KEYS);

    if ((cf = fopen("reqlog", "w")) == NULL) {
        printf("cannot open request log.\n");
        exit(1);
    }
    if ((sf = fopen("pglog", "w")) == NULL) {
        printf("cannot open page log.\n");
        exit(1);
    }

    if ((argc < 2) || (argc > 4)) {
        printf("Usage: %s <trace size> [<time duration>] [<start_time>]\n", argv[0]);
        return 1;
    }
    if (argc >= 3) {
        duration = strtod(argv[2], NULL);
        if (argc == 4) {
            startTime = strtod(argv[3], NULL);
            printf("start time = %f\n", startTime);
        }
    }

    sz_rlog = strtoul(argv[1], NULL, 10);
    rlog = new ReqLog[sz_rlog];

    while(1) {
        ret = lf_get_next_entry(stdin, lfntree);
        if (ret > 0) {
            if (ret == 1) {
                /* EOF */
                break;
            }
            fprintf(stderr, "Failed to get next entry.\n");
            exit(1);
        } else if (ret < 0) {
            // Unusable entry, i.e., cache miss, cgi-bin, etc.
            continue;
        }
        // Analyse one log entry
        ctime = lf_analyze(lfntree);
        delete []lfntree.url;
        delete []lfntree.sid;
        if ((duration > 0) && (ctime > duration))
            break;
    }
    Tcl_DeleteHashTable(&cidHash);
    Tcl_DeleteHashTable(&sidHash);

    fprintf(stderr, "sort url\n");
    sort_url();
    fclose(sf);

    fprintf(stderr, "sort requests\n");
    sort_rlog();
    fclose(cf);

    fprintf(stderr, 
        "%d unique clients, %d unique servers, %d unique urls.\n", 
        client, server, url);
    return 0;
}

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