/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: expandtab:ts=8:sw=4:softtabstop=4:
#ident "Copyright (c) 2007-2010 Tokutek Inc.  All rights reserved."

/* Scan the bench.tokudb/bench.db over and over. */
#define DONT_DEPRECATE_MALLOC

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <inttypes.h>
#ifdef BDB
#include <db.h>
#define DIRSUF bdb
#else
#include <tokudb.h>
#define DIRSUF tokudb
#endif
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>

static const char *pname;
static enum run_mode { RUN_HWC, RUN_LWC, RUN_VERIFY, RUN_RANGE} run_mode = RUN_HWC;
static int do_txns=1, prelock=0, prelockflag=0;
static u_int32_t lock_flag = 0;
static long limitcount=-1;
static u_int32_t cachesize = 127*1024*1024;
static u_int64_t start_range = 0, end_range = 0;
static int n_experiments = 2;
static int bulk_fetch = 1;

static int print_usage (const char *argv0) {
    fprintf(stderr, "Usage:\n%s [--verify-lwc | --lwc | --nohwc] [--prelock] [--prelockflag] [--prelockwriteflag] [--env DIR]\n", argv0);
    fprintf(stderr, "  --verify-lwc        means to run the light weight cursor and the heavyweight cursor to verify that they get the same answer.\n");
    fprintf(stderr, "  --lwc               run light weight cursors instead of heavy weight cursors\n");
    fprintf(stderr, "  --prelock           acquire a read lock on the entire table before running\n");
    fprintf(stderr, "  --prelockflag       pass DB_PRELOCKED to the the cursor get operation whenever the locks have been acquired\n");
    fprintf(stderr, "  --prelockwriteflag  pass DB_PRELOCKED_WRITE to the cursor get operation\n");
    fprintf(stderr, "  --nox               no transactions (no locking)\n");
    fprintf(stderr, "  --count COUNT       read the first COUNT rows and then  stop.\n");
    fprintf(stderr, "  --cachesize N       set the env cachesize to N bytes\n");
    fprintf(stderr, "  --srandom N         srandom(N)\n");
    fprintf(stderr, "  --env DIR           put db files in DIR instead of default\n");
    fprintf(stderr, "  --bulk_fetch 0|1    do bulk fetch on lwc operations (default: 1)\n");
    return 1;
}

static DB_ENV *env;
static DB *db;
static DB_TXN *tid=0;

#define STRINGIFY2(s) #s
#define STRINGIFY(s) STRINGIFY2(s)
static const char *dbdir = "./bench."  STRINGIFY(DIRSUF); /* DIRSUF is passed in as a -D argument to the compiler. */
static int env_open_flags_yesx = DB_CREATE|DB_PRIVATE|DB_INIT_MPOOL|DB_INIT_TXN|DB_INIT_LOG|DB_INIT_LOCK;
static int env_open_flags_nox = DB_CREATE|DB_PRIVATE|DB_INIT_MPOOL;
static char *dbfilename = "bench.db";


static void parse_args (int argc, const char *argv[]) {
    pname=argv[0];
    argc--; argv++;
    int specified_run_mode=0;
    while (argc>0) {
	if (strcmp(*argv,"--verify-lwc")==0) {
	    if (specified_run_mode && run_mode!=RUN_VERIFY) { two_modes: fprintf(stderr, "You specified two run modes\n"); exit(1); }
	    run_mode = RUN_VERIFY;
	} else if (strcmp(*argv, "--lwc")==0)  {
	    if (specified_run_mode && run_mode!=RUN_LWC) goto two_modes;
	    run_mode = RUN_LWC;
	} else if (strcmp(*argv, "--hwc")==0)  {
	    if (specified_run_mode && run_mode!=RUN_VERIFY) goto two_modes;
	    run_mode = RUN_HWC;
	} else if (strcmp(*argv, "--prelock")==0) prelock=1;
#ifdef TOKUDB
        else if (strcmp(*argv, "--prelockflag")==0)      { prelockflag=1; lock_flag = DB_PRELOCKED; }
        else if (strcmp(*argv, "--prelockwriteflag")==0) { prelockflag=1; lock_flag = DB_PRELOCKED_WRITE; }
#endif
	else if (strcmp(*argv, "--nox")==0)              { do_txns=0; }
	else if (strcmp(*argv, "--count")==0)            {
	    char *end;
            argc--; argv++; 
	    errno=0; limitcount=strtol(*argv, &end, 10); assert(errno==0);
	    printf("Limiting count to %ld\n", limitcount);
        } else if (strcmp(*argv, "--cachesize")==0 && argc>0) {
            char *end;
            argc--; argv++; 
            cachesize=(u_int32_t)strtol(*argv, &end, 10);
	} else if (strcmp(*argv, "--env") == 0) {
            argc--; argv++;
	    if (argc==0) exit(print_usage(pname));
	    dbdir = *argv;
        } else if (strcmp(*argv, "--range") == 0 && argc > 2) {
            run_mode = RUN_RANGE;
            argc--; argv++;
            start_range = strtoll(*argv, NULL, 10);
            argc--; argv++;
            end_range = strtoll(*argv, NULL, 10);
        } else if (strcmp(*argv, "--experiments") == 0 && argc > 1) {
            argc--; argv++;
            n_experiments = strtol(*argv, NULL, 10);
        } else if (strcmp(*argv, "--srandom") == 0 && argc > 1) {
	    argc--; argv++;
            srandom(atoi(*argv));
        } else if (strcmp(*argv, "--bulk_fetch") == 0 && argc > 1) {
            argc--; argv++;
            bulk_fetch = atoi(*argv);
	} else {
            exit(print_usage(pname));
	}
	argc--; argv++;
    }
    //Prelocking is meaningless without transactions
    if (do_txns==0) {
        prelockflag=0;
        lock_flag=0;
        prelock=0;
    }
}

static void scanscan_setup (void) {
    int r;
    r = db_env_create(&env, 0);                                                           assert(r==0);
    r = env->set_cachesize(env, 0, cachesize, 1);                                         assert(r==0);
    r = env->open(env, dbdir, do_txns? env_open_flags_yesx : env_open_flags_nox, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);   assert(r==0);
    r = db_create(&db, env, 0);                                                           assert(r==0);
    if (do_txns) {
	r = env->txn_begin(env, 0, &tid, 0);                                              assert(r==0);
    }
    r = db->open(db, tid, dbfilename, NULL, DB_BTREE, 0, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);                           assert(r==0);
#ifdef TOKUDB
    if (prelock) {
	r = db->pre_acquire_table_lock(db, tid);
	assert(r==0);
    }
#endif
}

static void scanscan_shutdown (void) {
    int r;
    r = db->close(db, 0);                                       assert(r==0);
    if (do_txns) {
	r = tid->commit(tid, 0);                                    assert(r==0);
    }
    r = env->close(env, 0);                                     assert(r==0);
}

static double gettime (void) {
    struct timeval tv;
    int r = gettimeofday(&tv, 0);
    assert(r==0);
    return tv.tv_sec + 1e-6*tv.tv_usec;
}

static void scanscan_hwc (void) {
    int r;
    int counter=0;
    for (counter=0; counter<n_experiments; counter++) {
	long long totalbytes=0;
	int rowcounter=0;
	double prevtime = gettime();
	DBT k,v;
	DBC *dbc;
	r = db->cursor(db, tid, &dbc, 0);                           assert(r==0);
	memset(&k, 0, sizeof(k));
	memset(&v, 0, sizeof(v));
        u_int32_t c_get_flags = DB_NEXT;
        if (prelockflag && (counter || prelock)) {
            c_get_flags |= lock_flag;
        }
	while (0 == (r = dbc->c_get(dbc, &k, &v, c_get_flags))) {
	    
	    //printf("r=%d\n", r);

	    totalbytes += k.size + v.size;
	    rowcounter++;
	    if (limitcount>0 && rowcounter>=limitcount) break;
	}
	assert(r==DB_NOTFOUND);
	r = dbc->c_close(dbc);                                      assert(r==0);
	double thistime = gettime();
	double tdiff = thistime-prevtime;
	printf("Scan    %lld bytes (%d rows) in %9.6fs at %9fMB/s\n", totalbytes, rowcounter, tdiff, 1e-6*totalbytes/tdiff);
    }
}

#ifdef TOKUDB

struct extra_count {
    long long totalbytes;
    int rowcounter;
};

static int counttotalbytes (DBT const *key, DBT const *data, void *extrav) {
    struct extra_count *e=extrav;
    e->totalbytes += key->size + data->size;
    e->rowcounter++;
    return bulk_fetch ? TOKUDB_CURSOR_CONTINUE : 0;
}

static void scanscan_lwc (void) {
    int r;
    int counter=0;
    for (counter=0; counter<n_experiments; counter++) {
	struct extra_count e = {0,0};
	double prevtime = gettime();
	DBC *dbc;
	r = db->cursor(db, tid, &dbc, 0);                           assert(r==0);
        u_int32_t f_flags = 0;
        if (prelockflag && (counter || prelock)) {
            f_flags |= lock_flag;
        }
	long rowcounter=0;
	while (0 == (r = dbc->c_getf_next(dbc, f_flags, counttotalbytes, &e))) {
	    rowcounter++;
	    if (limitcount>0 && rowcounter>=limitcount) break;
	}
	r = dbc->c_close(dbc);                                      assert(r==0);
	double thistime = gettime();
	double tdiff = thistime-prevtime;
	printf("LWC Scan %lld bytes (%d rows) in %9.6fs at %9fMB/s\n", e.totalbytes, e.rowcounter, tdiff, 1e-6*e.totalbytes/tdiff);
    }
}
#endif

static void scanscan_range (void) {
    int r;

    double texperiments[n_experiments];
    u_int64_t k = 0;
    char kv[8];
    DBT key, val;
  
    int counter;
    for (counter = 0; counter < n_experiments; counter++) {

        if (1) { //if ((counter&1) == 0) {   
   	makekey:
	    // generate a random key in the key range
	    k = (start_range + (random() % (end_range - start_range))) * (1<<6);
            int i;
	    for (i = 0; i < 8; i++)
                kv[i] = k >> (56-8*i);
	}
	memset(&key, 0, sizeof key); key.data = &kv, key.size = sizeof kv;
	memset(&val, 0, sizeof val);

        double tstart = gettime();

        DBC *dbc;
        r = db->cursor(db, tid, &dbc, 0); assert(r==0);

        // set the cursor to the random key
        r = dbc->c_get(dbc, &key, &val, DB_SET_RANGE+lock_flag);
        if (r != 0) {
            assert(r == DB_NOTFOUND);
            printf("%s:%d %"PRIu64"\n", __FUNCTION__, __LINE__, k);
            goto makekey;
        }

#ifdef TOKUDB
        // do the range scan
	long rowcounter = 0;
	struct extra_count e = {0,0};
        while (limitcount > 0 && rowcounter < limitcount) {
            r = dbc->c_getf_next(dbc, prelockflag ? lock_flag : 0, counttotalbytes, &e);
            if (r != 0)
                break;
	    rowcounter++;
	}
#endif

        r = dbc->c_close(dbc);                                      
        assert(r==0);

        texperiments[counter] = gettime() - tstart;
        printf("%"PRIu64" %f\n", k, texperiments[counter]); fflush(stdout);
    }

    // print the times
    double tsum = 0.0, tmin = 0.0, tmax = 0.0;
    for (counter = 0; counter < n_experiments; counter++) {
        if (counter==0 || texperiments[counter] < tmin)
            tmin = texperiments[counter];
        if (counter==0 || texperiments[counter] > tmax)
            tmax = texperiments[counter];
        tsum += texperiments[counter];
    }
    printf("%f %f %f/%d = %f\n", tmin, tmax, tsum, n_experiments, tsum / n_experiments);
}

#ifdef TOKUDB

struct extra_verify {
    long long totalbytes;
    int rowcounter;
    DBT k,v; // the k and v are gotten using the old cursor
};

static int
checkbytes (DBT const *key, DBT const *data, void *extrav) {
    struct extra_verify *e=extrav;
    e->totalbytes += key->size + data->size;
    e->rowcounter++;
    assert(e->k.size == key->size);
    assert(e->v.size == data->size);
    assert(memcmp(e->k.data, key->data,  key->size)==0);
    assert(memcmp(e->v.data, data->data, data->size)==0);
    assert(e->k.data != key->data);
    assert(e->v.data != data->data);
    return 0;
}
    

static void scanscan_verify (void) {
    int r;
    int counter=0;
    for (counter=0; counter<n_experiments; counter++) {
	struct extra_verify v;
	v.totalbytes=0;
	v.rowcounter=0;
	double prevtime = gettime();
	DBC *dbc1, *dbc2;
	r = db->cursor(db, tid, &dbc1, 0);                           assert(r==0);
	r = db->cursor(db, tid, &dbc2, 0);                           assert(r==0);
	memset(&v.k, 0, sizeof(v.k));
	memset(&v.v, 0, sizeof(v.v));
        u_int32_t f_flags = 0;
        u_int32_t c_get_flags = DB_NEXT;
        if (prelockflag && (counter || prelock)) {
            f_flags     |= lock_flag;
            c_get_flags |= lock_flag;
        }
	while (1) {
	    int r1,r2;
	    r2 = dbc1->c_get(dbc1, &v.k, &v.v, c_get_flags);
	    r1 = dbc2->c_getf_next(dbc2, f_flags, checkbytes, &v);
	    assert(r1==r2);
	    if (r1) break;
	}
	r = dbc1->c_close(dbc1);                                      assert(r==0);
	r = dbc2->c_close(dbc2);                                      assert(r==0);
	double thistime = gettime();
	double tdiff = thistime-prevtime;
	printf("verify   %lld bytes (%d rows) in %9.6fs at %9fMB/s\n", v.totalbytes, v.rowcounter, tdiff, 1e-6*v.totalbytes/tdiff);
    }
}

#endif

int main (int argc, const char *argv[]) {

    parse_args(argc,argv);

    scanscan_setup();
    switch (run_mode) {
    case RUN_HWC:    scanscan_hwc();    break;
#ifdef TOKUDB
    case RUN_LWC:    scanscan_lwc();    break;
    case RUN_VERIFY: scanscan_verify(); break;
#endif
    case RUN_RANGE:  scanscan_range();  break;
    default:         assert(0);         break;
    }
    scanscan_shutdown();

    return 0;
}