SuperNET/iguana/exchanges/LP_scan.c

/******************************************************************************
 * Copyright © 2014-2017 The SuperNET Developers.                             *
 *                                                                            *
 * See the AUTHORS, DEVELOPER-AGREEMENT and LICENSE files at                  *
 * the top-level directory of this distribution for the individual copyright  *
 * holder information and the developer policies on copyright and licensing.  *
 *                                                                            *
 * Unless otherwise agreed in a custom licensing agreement, no part of the    *
 * SuperNET software, including this file may be copied, modified, propagated *
 * or distributed except according to the terms contained in the LICENSE file *
 *                                                                            *
 * Removal or modification of this copyright notice is prohibited.            *
 *                                                                            *
 ******************************************************************************/
//
//  LP_scan.c
//  marketmaker
//


struct LP_address *_LP_addressfind(struct iguana_info *coin,char *coinaddr)
{
    struct LP_address *ap;
    HASH_FIND(hh,coin->addresses,coinaddr,strlen(coinaddr),ap);
    return(ap);
}

struct LP_address *_LP_addressadd(struct iguana_info *coin,char *coinaddr)
{
    struct LP_address *ap;
    ap = calloc(1,sizeof(*ap));
    safecopy(ap->coinaddr,coinaddr,sizeof(ap->coinaddr));
    HASH_ADD_KEYPTR(hh,coin->addresses,ap->coinaddr,strlen(ap->coinaddr),ap);
    return(ap);
}

struct LP_address *_LP_address(struct iguana_info *coin,char *coinaddr)
{
    struct LP_address *ap;
    if ( (ap= _LP_addressfind(coin,coinaddr)) == 0 )
        ap = _LP_addressadd(coin,coinaddr);
    return(ap);
}

struct LP_transaction *LP_transactionfind(struct iguana_info *coin,bits256 txid)
{
    struct LP_transaction *tx;
    portable_mutex_lock(&coin->txmutex);
    HASH_FIND(hh,coin->transactions,txid.bytes,sizeof(txid),tx);
    portable_mutex_unlock(&coin->txmutex);
    return(tx);
}

struct LP_transaction *LP_transactionadd(struct iguana_info *coin,bits256 txid,int32_t height,int32_t numvouts,int32_t numvins,uint32_t timestamp)
{
    struct LP_transaction *tx; int32_t i;
    if ( (tx= LP_transactionfind(coin,txid)) == 0 )
    {
        //char str[65]; printf("%s ht.%d u.%u NEW TXID.(%s) vouts.[%d]\n",coin->symbol,height,timestamp,bits256_str(str,txid),numvouts);
        //if ( bits256_nonz(txid) == 0 && tx->height == 0 )
        //    getchar();
        tx = calloc(1,sizeof(*tx) + (sizeof(*tx->outpoints) * numvouts));
        for (i=0; i<numvouts; i++)
            tx->outpoints[i].spendvini = -1;
        tx->height = height;
        tx->numvouts = numvouts;
        tx->numvins = numvins;
        tx->timestamp = timestamp;
        tx->txid = txid;
        portable_mutex_lock(&coin->txmutex);
        HASH_ADD_KEYPTR(hh,coin->transactions,tx->txid.bytes,sizeof(tx->txid),tx);
        portable_mutex_unlock(&coin->txmutex);
    } // else printf("warning adding already existing txid %s\n",bits256_str(str,tx->txid));
    return(tx);
}

int32_t LP_txheight(uint32_t *timestampp,uint32_t *blocktimep,struct iguana_info *coin,bits256 txid)
{
    bits256 blockhash; cJSON *blockobj,*txobj; int32_t height = 0;
    if ( (txobj= LP_gettx(coin->symbol,txid)) != 0 )
    {
        *timestampp = juint(txobj,"locktime");
        *blocktimep = juint(txobj,"blocktime");
        blockhash = jbits256(txobj,"blockhash");
        if ( bits256_nonz(blockhash) != 0 && (blockobj= LP_getblock(coin->symbol,blockhash)) != 0 )
        {
            height = jint(blockobj,"height");
            //printf("%s LP_txheight.%d\n",coin->symbol,height);
            free_json(blockobj);
        } //else printf("%s LP_txheight error (%s)\n",coin->symbol,jprint(txobj,0));
        free_json(txobj);
    }
    return(height);
}

int32_t LP_undospends(struct iguana_info *coin,int32_t lastheight)
{
    int32_t i,ht,num = 0; uint32_t timestamp,blocktime; struct LP_transaction *tx,*tmp;
    HASH_ITER(hh,coin->transactions,tx,tmp)
    {
        for (i=0; i<tx->numvouts; i++)
        {
            if ( bits256_nonz(tx->outpoints[i].spendtxid) == 0 )
                continue;
            if ( (ht= tx->outpoints[i].spendheight) == 0 )
            {
                tx->outpoints[i].spendheight = LP_txheight(&timestamp,&blocktime,coin,tx->outpoints[i].spendtxid);
            }
            if ( (ht= tx->outpoints[i].spendheight) != 0 && ht > lastheight )
            {
                char str[65]; printf("clear spend %s/v%d at ht.%d > lastheight.%d\n",bits256_str(str,tx->txid),i,ht,lastheight);
                tx->outpoints[i].spendheight = 0;
                tx->outpoints[i].spendvini = -1;
                memset(tx->outpoints[i].spendtxid.bytes,0,sizeof(bits256));
            }
        }
    }
    return(num);
}

uint64_t LP_txinterestvalue(uint64_t *interestp,char *destaddr,struct iguana_info *coin,bits256 txid,int32_t vout)
{
    uint64_t interest,value = 0; cJSON *txobj,*sobj,*array; int32_t n=0;
    *interestp = 0;
    destaddr[0] = 0;
    if ( (txobj= LP_gettxout(coin->symbol,txid,vout)) != 0 )
    {
        if ( (value= jdouble(txobj,"amount")*SATOSHIDEN) == 0 && (value= jdouble(txobj,"value")*SATOSHIDEN) == 0 )
        {
            char str[65]; printf("%s LP_txvalue.%s strange utxo.(%s) vout.%d\n",coin->symbol,bits256_str(str,txid),jprint(txobj,0),vout);
        }
        else if ( strcmp(coin->symbol,"KMD") == 0 )
        {
            if ( (interest= jdouble(txobj,"interest")) != 0. )
            {
                //printf("add interest of %.8f to %.8f\n",interest,dstr(value));
                *interestp = SATOSHIDEN * interest;
            }
        }
        if ( (sobj= jobj(txobj,"scriptPubKey")) != 0 && (array= jarray(&n,sobj,"addresses")) != 0 )
        {
            strcpy(destaddr,jstri(array,0));
            if ( n > 1 )
                printf("LP_txinterestvalue warning: violation of 1 output assumption n.%d\n",n);
        } else printf("LP_txinterestvalue no addresses found?\n");
        //char str[65]; printf("%s %.8f <- %s.(%s) txobj.(%s)\n",destaddr,dstr(value),coin->symbol,bits256_str(str,txid),jprint(txobj,0));
        free_json(txobj);
    } //else { char str[65]; printf("null gettxout return %s/v%d\n",bits256_str(str,txid),vout); }
    return(value);
}

int32_t LP_transactioninit(struct iguana_info *coin,bits256 txid,int32_t iter)
{
    struct LP_transaction *tx; char *address; int32_t i,n,height,numvouts,numvins,spentvout; uint32_t timestamp,blocktime; cJSON *txobj,*vins,*vouts,*vout,*vin,*sobj,*addresses; bits256 spenttxid; char str[65];
    if ( (txobj= LP_gettx(coin->symbol,txid)) != 0 )
    {
        //printf("TX.(%s)\n",jprint(txobj,0));
        height = LP_txheight(&timestamp,&blocktime,coin,txid);
        if ( timestamp == 0 && height > 0 )
            timestamp = blocktime;
        vins = jarray(&numvins,txobj,"vin");
        vouts = jarray(&numvouts,txobj,"vout");
        if ( iter == 0 && vouts != 0 && (tx= LP_transactionadd(coin,txid,height,numvouts,numvins,timestamp)) != 0 )
        {
            for (i=0; i<numvouts; i++)
            {
                vout = jitem(vouts,i);
                if ( (tx->outpoints[i].value= SATOSHIDEN * jdouble(vout,"value")) == 0 )
                    tx->outpoints[i].value = SATOSHIDEN * jdouble(vout,"amount");
                tx->outpoints[i].interest = SATOSHIDEN * jdouble(vout,"interest");
                if ( (sobj= jobj(vout,"scriptPubKey")) != 0 )
                {
                    if ( (addresses= jarray(&n,sobj,"addresses")) != 0 && n > 0 )
                    {
                        //printf("%s\n",jprint(addresses,0));
                        if ( n > 1 )
                            printf("LP_transactioninit: txid.(%s) multiple addresses.[%s]\n",bits256_str(str,txid),jprint(addresses,0));
                        if ( (address= jstri(addresses,0)) != 0 && strlen(address) < sizeof(tx->outpoints[i].coinaddr) )
                        {
                            strcpy(tx->outpoints[i].coinaddr,address);
                            if ( 0 && strcmp(address,"RXzsovGBQ3W97xnVC6JnWxXsV4qb7p7iBi") == 0 )
                                printf("%s %.8f at height.%d\n",address,dstr(tx->outpoints[i].value),height);
                        }
                    }
                }
            }
        }
        if ( iter == 1 && vins != 0 )
        {
            for (i=0; i<numvins; i++)
            {
                vin = jitem(vins,i);
                spenttxid = jbits256(vin,"txid");
                spentvout = jint(vin,"vout");
                if ( i == 0 && bits256_nonz(spenttxid) == 0 )
                    continue;
                if ( (tx= LP_transactionfind(coin,spenttxid)) != 0 )
                {
                    if ( spentvout < tx->numvouts )
                    {
                        tx->outpoints[spentvout].spendtxid = txid;
                        tx->outpoints[spentvout].spendvini = i;
                        tx->outpoints[spentvout].spendheight = height;
                        //printf("spend %s %s/v%d at ht.%d\n",coin->symbol,bits256_str(str,tx->txid),spentvout,height);
                    } else printf("LP_transactioninit: %s spentvout.%d < numvouts.%d\n",bits256_str(str,spenttxid),spentvout,tx->numvouts);
                } //else printf("LP_transactioninit: couldnt find (%s) ht.%d %s\n",bits256_str(str,spenttxid),height,jprint(vin,0));
                if ( bits256_cmp(spenttxid,txid) == 0 )
                    printf("spending same tx's %p vout ht.%d %s.[%d] s%d\n",tx,height,bits256_str(str,txid),tx!=0?tx->numvouts:0,spentvout);
            }
        }
        free_json(txobj);
        return(0);
    } //else printf("LP_transactioninit error for %s %s\n",coin->symbol,bits256_str(str,txid));
    return(-1);
}

int32_t LP_blockinit(struct iguana_info *coin,int32_t height)
{
    int32_t i,iter,numtx,checkht=-1; cJSON *blockobj,*txs; bits256 txid; struct LP_transaction *tx;
    if ( (blockobj= LP_blockjson(&checkht,coin->symbol,0,height)) != 0 )
    {
        if ( (txs= jarray(&numtx,blockobj,"tx")) != 0 )
        {
            for (iter=0; iter<2; iter++)
            for (i=0; i<numtx; i++)
            {
                txid = jbits256i(txs,i);
                if ( (tx= LP_transactionfind(coin,txid)) != 0 )
                {
                    if ( tx->height == 0 )
                        tx->height = height;
                    else if ( tx->height != height )
                    {
                        printf("LP_blockinit: tx->height %d != %d\n",tx->height,height);
                        tx->height = height;
                    }
                    if ( iter == 1 )
                        LP_transactioninit(coin,txid,iter);
                } else LP_transactioninit(coin,txid,iter);
            }
        }
        free_json(blockobj);
    }
    if ( checkht == height )
        return(0);
    else return(-1);
}

int32_t LP_scanblockchain(struct iguana_info *coin,int32_t startheight,int32_t endheight)
{
    int32_t ht,n = 0;
    for (ht=startheight; ht<=endheight; ht++)
    {
        if ( LP_blockinit(coin,ht) < 0 )
        {
            printf("error loading block.%d of (%d, %d)\n",ht,startheight,endheight);
            return(ht-1);
        }
        n++;
        if ( (n % 1000) == 0 )
            fprintf(stderr,"%.1f%% ",100. * (double)n/(endheight-startheight+1));
    }
    return(endheight);
}

int sort_balance(void *a,void *b)
{
    int64_t aval,bval;
    /* compare a to b (cast a and b appropriately)
     * return (int) -1 if (a < b)
     * return (int)  0 if (a == b)
     * return (int)  1 if (a > b)
     */
    aval = ((struct LP_address *)a)->balance;
    bval = ((struct LP_address *)b)->balance;
    //printf("%.8f vs %.8f -> %d\n",dstr(aval),dstr(bval),(int32_t)(bval - aval));
    return((aval == bval) ? 0 : ((aval < bval) ? 1 : -1));
}

// a primitive restore can be done by loading the previous snapshot and creating a virtual tx for all the balance at height-1. this wont allow anything but new snapshots, but for many use cases that is all that is needed

cJSON *LP_snapshot(struct iguana_info *coin,int32_t height)
{
    static char lastcoin[16]; static int32_t maxsnapht;
    struct LP_transaction *tx,*tmp; struct LP_address *ap,*atmp; int32_t i,n,skipflag=0,startht,endht,ht; uint64_t balance=0,noaddr_balance=0; cJSON *retjson,*array,*item;
    //LP_blockinit(coin,421011);
    startht = 1;
    endht = height-1;
    if ( strcmp(coin->symbol,lastcoin) == 0 )
    {
        if ( maxsnapht > height )
            skipflag = 1;
        else startht = maxsnapht+1;
    }
    else
    {
        maxsnapht = 0;
        strcpy(lastcoin,coin->symbol);
    }
    retjson = cJSON_CreateObject();
    if ( skipflag == 0 && startht < endht )
    {
        if ( (ht= LP_scanblockchain(coin,startht,endht)) < endht )
        {
            if ( ht > maxsnapht )
            {
                maxsnapht = ht;
                printf("maxsnapht.%d for %s\n",maxsnapht,coin->symbol);
            }
            sleep(10);
            if ( (ht= LP_scanblockchain(coin,maxsnapht+1,endht)) < endht )
            {
                if ( ht > maxsnapht )
                {
                    maxsnapht = ht;
                    printf("maxsnapht.%d for %s\n",maxsnapht,coin->symbol);
                }
                jaddstr(retjson,"error","blockchain scan error");
                return(retjson);
            }
        }
        if ( ht > maxsnapht )
        {
            maxsnapht = ht;
            printf("maxsnapht.%d for %s\n",maxsnapht,coin->symbol);
        }
    }
    portable_mutex_lock(&coin->txmutex);
    HASH_ITER(hh,coin->addresses,ap,atmp)
    {
        ap->balance = 0;
    }
    HASH_ITER(hh,coin->transactions,tx,tmp)
    {
        if ( tx->height < height )
        {
            for (i=0; i<tx->numvouts; i++)
            {
                if ( (ht=tx->outpoints[i].spendheight) > 0 && ht < height )
                    continue;
                if ( tx->outpoints[i].coinaddr[0] != 0 && (ap= _LP_address(coin,tx->outpoints[i].coinaddr)) != 0 )
                {
                    balance += tx->outpoints[i].value;
                    ap->balance += tx->outpoints[i].value;
                    //printf("(%s/%s) %.8f %.8f\n",tx->outpoints[i].coinaddr,ap->coinaddr,dstr(tx->outpoints[i].value),dstr(ap->balance));
                } else noaddr_balance += tx->outpoints[i].value;
            }
        }
    }
    HASH_SORT(coin->addresses,sort_balance);
    portable_mutex_unlock(&coin->txmutex);
    printf("%s balance %.8f at height.%d\n",coin->symbol,dstr(balance),height);
    array = cJSON_CreateArray();
    n = 0;
    HASH_ITER(hh,coin->addresses,ap,atmp)
    {
        if ( ap->balance != 0 )
        {
            item = cJSON_CreateObject();
            jaddnum(item,ap->coinaddr,dstr(ap->balance));
            jaddi(array,item);
            n++;
        }
    }
    jadd(retjson,"balances",array);
    jaddstr(retjson,"coin",coin->symbol);
    jaddnum(retjson,"height",height);
    jaddnum(retjson,"numaddresses",n);
    jaddnum(retjson,"total",dstr(balance));
    jaddnum(retjson,"noaddr_total",dstr(noaddr_balance));
    return(retjson);
}

char *LP_snapshot_balance(struct iguana_info *coin,int32_t height,cJSON *argjson)
{
    cJSON *snapjson,*retjson,*balances,*array,*addrs,*child,*item,*item2; char *coinaddr,*refaddr; int32_t i,n,j,m; uint64_t total=0,value,balance = 0;
    retjson = cJSON_CreateObject();
    array = cJSON_CreateArray();
    if ( (snapjson= LP_snapshot(coin,height)) != 0 )
    {
        total = jdouble(snapjson,"total");
        if ( (addrs= jarray(&m,argjson,"addresses")) != 0 )
        {
            if ( (balances= jarray(&n,snapjson,"balances")) != 0 )
            {
                for (i=0; i<n; i++)
                {
                    item = jitem(balances,i);
                    if ( (child= item->child) != 0 )
                    {
                        value = (uint64_t)(child->valuedouble * SATOSHIDEN);
                        if ( (refaddr= get_cJSON_fieldname(child)) != 0 )
                        {
                            //printf("check %s %.8f against %d\n",refaddr,dstr(value),m);
                            for (j=0; j<m; j++)
                            {
                                if ( (coinaddr= jstri(addrs,j)) != 0 )
                                {
                                    if ( strcmp(coinaddr,refaddr) == 0 )
                                    {
                                        item2 = cJSON_CreateObject();
                                        jaddnum(item2,coinaddr,dstr(value));
                                        jaddi(array,item2);
                                        balance += value;
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        free_json(snapjson);
    }
    jadd(retjson,"balances",array);
    jaddstr(retjson,"coin",coin->symbol);
    jaddnum(retjson,"height",height);
    jaddnum(retjson,"balance",dstr(balance));
    jaddnum(retjson,"total",dstr(total));
    return(jprint(retjson,1));
}

char *LP_dividends(struct iguana_info *coin,int32_t height,cJSON *argjson)
{
    cJSON *array,*retjson,*item,*child,*exclude=0; int32_t i,j,emitted=0,dusted=0,n,execflag=0,flag,iter,numexcluded=0; char buf[1024],*field,*prefix="",*suffix=""; uint64_t dustsum=0,excluded=0,total=0,dividend=0,value,val,emit=0,dust=0; double ratio = 1.;
    if ( (retjson= LP_snapshot(coin,height)) != 0 )
    {
        //printf("SNAPSHOT.(%s)\n",retstr);
        if ( (array= jarray(&n,retjson,"balances")) != 0 )
        {
            if ( (n= cJSON_GetArraySize(array)) != 0 )
            {
                if ( argjson != 0 )
                {
                    exclude = jarray(&numexcluded,argjson,"exclude");
                    dust = (uint64_t)(jdouble(argjson,"dust") * SATOSHIDEN);
                    dividend = (uint64_t)(jdouble(argjson,"dividend") * SATOSHIDEN);
                    if ( jstr(argjson,"prefix") != 0 )
                        prefix = jstr(argjson,"prefix");
                    if ( jstr(argjson,"suffix") != 0 )
                        suffix = jstr(argjson,"suffix");
                    execflag = jint(argjson,"system");
                }
                for (iter=0; iter<2; iter++)
                {
                    for (i=0; i<n; i++)
                    {
                        flag = 0;
                        item = jitem(array,i);
                        if ( (child= item->child) != 0 )
                        {
                            value = (uint64_t)(child->valuedouble * SATOSHIDEN);
                            if ( (field= get_cJSON_fieldname(child)) != 0 )
                            {
                                for (j=0; j<numexcluded; j++)
                                    if ( strcmp(field,jstri(exclude,j)) == 0 )
                                    {
                                        flag = 1;
                                        break;
                                    }
                            }
                            //printf("(%s %s %.8f) ",jprint(item,0),field,dstr(value));
                            if ( iter == 0 )
                            {
                                if ( flag != 0 )
                                    excluded += value;
                                else total += value;
                            }
                            else
                            {
                                if ( flag == 0 )
                                {
                                    val = ratio * value;
                                    if ( val >= dust )
                                    {
                                        sprintf(buf,"%s %s %.8f %s",prefix,field,dstr(val),suffix);
                                        if ( execflag != 0 )
                                        {
                                            if ( system(buf) != 0 )
                                                printf("error system.(%s)\n",buf);
                                        }
                                        else printf("%s\n",buf);
                                        emit += val;
                                        emitted++;
                                    } else dustsum += val, dusted++;
                                }
                            }
                        }
                    }
                    if ( iter == 0 )
                    {
                        if ( total > 0 )
                        {
                            if ( dividend == 0 )
                                dividend = total;
                            ratio = (double)dividend / total;
                        } else break;
                    }
                }
            }
        }
        free_json(retjson);
        retjson = cJSON_CreateObject();
        jaddstr(retjson,"coin",coin->symbol);
        jaddnum(retjson,"height",height);
        jaddnum(retjson,"total",dstr(total));
        jaddnum(retjson,"emitted",emitted);
        jaddnum(retjson,"excluded",dstr(excluded));
        if ( dust != 0 )
        {
            jaddnum(retjson,"dust",dstr(dust));
            jaddnum(retjson,"dusted",dusted);
        }
        if ( dustsum != 0 )
            jaddnum(retjson,"dustsum",dstr(dustsum));
        jaddnum(retjson,"dividend",dstr(dividend));
        jaddnum(retjson,"dividends",dstr(emit));
        jaddnum(retjson,"ratio",ratio);
        if ( execflag != 0 )
            jaddnum(retjson,"system",execflag);
        /*if ( prefix[0] != 0 )
            jaddstr(retjson,"prefix",prefix);
        if ( suffix[0] != 0 )
            jaddstr(retjson,"suffix",suffix);*/
        return(jprint(retjson,1));
    }
    return(clonestr("{\"error\":\"symbol not found\"}"));
}

int64_t basilisk_txvalue(char *symbol,bits256 txid,int32_t vout)
{
    char destaddr[64]; uint64_t value,interest = 0; struct iguana_info *coin;
    if ( (coin= LP_coinfind(symbol)) == 0 || coin->inactive != 0 )
        return(0);
    //char str[65]; printf("%s txvalue.(%s)\n",symbol,bits256_str(str,txid));
    value = LP_txinterestvalue(&interest,destaddr,coin,txid,vout);
    return(value + interest);
}
    
uint64_t LP_txvalue(char *coinaddr,char *symbol,bits256 txid,int32_t vout)
{
    struct LP_transaction *tx; char _coinaddr[64]; uint64_t interest = 0,value = 0; struct iguana_info *coin;
    if ( (coin= LP_coinfind(symbol)) == 0 || coin->inactive != 0 )
        return(0);
    if ( coinaddr != 0 )
        coinaddr[0] = 0;
    if ( (tx= LP_transactionfind(coin,txid)) != 0 )
    {
        if ( vout < tx->numvouts )
        {
            if ( bits256_nonz(tx->outpoints[vout].spendtxid) != 0 )
            {
                //char str[65]; printf("%s/v%d is spent\n",bits256_str(str,txid),vout);
                return(0);
            }
            else
            {
                if ( coinaddr != 0 )
                    value = LP_txinterestvalue(&tx->outpoints[vout].interest,coinaddr,coin,txid,vout);
                //printf("return value %.8f + interest %.8f\n",dstr(tx->outpoints[vout].value),dstr(tx->outpoints[vout].interest));
                return(tx->outpoints[vout].value + tx->outpoints[vout].interest);
            }
        } else printf("vout.%d >= tx->numvouts.%d\n",vout,tx->numvouts);
    }
    if ( tx == 0 )
    {
        LP_transactioninit(coin,txid,0);
        LP_transactioninit(coin,txid,1);
    }
    if ( coinaddr == 0 )
        coinaddr = _coinaddr;
    value = LP_txinterestvalue(&interest,coinaddr,coin,txid,vout);
    //printf("coinaddr.(%s) value %.8f interest %.8f\n",coinaddr,dstr(value),dstr(interest));
    return(value + interest);
}

int32_t LP_spendsearch(bits256 *spendtxidp,int32_t *indp,char *symbol,bits256 searchtxid,int32_t searchvout)
{
    struct LP_transaction *tx; struct iguana_info *coin;
    *indp = -1;
    if ( (coin= LP_coinfind(symbol)) == 0 || coin->inactive != 0 )
        return(-1);
    memset(spendtxidp,0,sizeof(*spendtxidp));
    if ( (tx= LP_transactionfind(coin,searchtxid)) != 0 )
    {
        if ( searchvout < tx->numvouts && tx->outpoints[searchvout].spendvini >= 0 )
        {
            *spendtxidp = tx->outpoints[searchvout].spendtxid;
            *indp = tx->outpoints[searchvout].spendvini;
            return(tx->outpoints[searchvout].spendheight);
        }
    }
    return(-1);
}

int32_t LP_mempoolscan(char *symbol,bits256 searchtxid)
{
    int32_t i,n; cJSON *array; bits256 txid; struct iguana_info *coin; struct LP_transaction *tx;
    if ( (coin= LP_coinfind(symbol)) == 0 || coin->inactive != 0 )
        return(-1);
    if ( (array= LP_getmempool(symbol)) != 0 )
    {
        if ( is_cJSON_Array(array) != 0 && (n= cJSON_GetArraySize(array)) > 0 )
        {
            for (i=0; i<n; i++)
            {
                txid = jbits256i(array,i);
                if ( (tx= LP_transactionfind(coin,txid)) == 0 )
                {
                    LP_transactioninit(coin,txid,0);
                    LP_transactioninit(coin,txid,1);
                }
                if ( bits256_cmp(txid,searchtxid) == 0 )
                {
                    char str[65]; printf("found %s tx.(%s) in mempool slot.%d\n",symbol,bits256_str(str,txid),i);
                    return(i);
                }
            }
        }
        free_json(array);
    }
    return(-1);
}

int32_t LP_numconfirms(struct basilisk_swap *swap,struct basilisk_rawtx *rawtx,int32_t mempool)
{
    struct iguana_info *coin; int32_t numconfirms = 100;
//#ifndef BASILISK_DISABLEWAITTX
    cJSON *txobj;
    if ( (coin= LP_coinfind(rawtx->coin->symbol)) == 0 || coin->inactive != 0 )
        return(-1);
    numconfirms = -1;
    if ( (txobj= LP_gettx(rawtx->coin->symbol,rawtx->I.signedtxid)) != 0 )
    {
        numconfirms = jint(txobj,"confirmations");
        free_json(txobj);
    }
    else if ( mempool != 0 && LP_mempoolscan(rawtx->coin->symbol,rawtx->I.signedtxid) >= 0 )
        numconfirms = 0;
//#endif
    return(numconfirms);
}

int32_t LP_waitmempool(char *symbol,bits256 txid,int32_t duration)
{
    uint32_t expiration = (uint32_t)time(NULL) + duration;
    while ( time(NULL) < expiration )
    {
        if ( LP_mempoolscan(symbol,txid) >= 0 )
            return(0);
        usleep(500000);
    }
    return(-1);
}

int32_t LP_mempool_vinscan(bits256 *spendtxidp,int32_t *spendvinp,char *symbol,bits256 searchtxid,int32_t searchvout,bits256 searchtxid2,int32_t searchvout2)
{
    struct iguana_info *coin; int32_t selector; cJSON *array;
    if ( symbol == 0 || symbol[0] == 0 || bits256_nonz(searchtxid) == 0 || bits256_nonz(searchtxid2) == 0 )
        return(-1);
    if ( (coin= LP_coinfind(symbol)) == 0 || coin->inactive != 0 )
        return(-1);
    if ( time(NULL) > coin->lastmempool+LP_MEMPOOL_TIMEINCR )
    {
        if ( (array= LP_getmempool(symbol)) != 0 )
        {
            free_json(array);
            coin->lastmempool = (uint32_t)time(NULL);
        }
    }
    if ( (selector= LP_spendsearch(spendtxidp,spendvinp,symbol,searchtxid,searchvout)) >= 0 )
        return(selector);
    else if ( (selector= LP_spendsearch(spendtxidp,spendvinp,symbol,searchtxid2,searchvout2)) >= 0 )
        return(selector);
    return(-1);
}