SuperNET/iguana/exchanges/LP_peers.c

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 * Copyright © 2014-2017 The SuperNET Developers.                             *
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//
//  LP_peers.c
//  marketmaker
//

struct LP_peerinfo *LP_peerfind(uint32_t ipbits,uint16_t port)
{
    struct LP_peerinfo *peer=0; uint64_t ip_port;
    ip_port = ((uint64_t)port << 32) | ipbits;
    portable_mutex_lock(&LP_peermutex);
    HASH_FIND(hh,LP_peerinfos,&ip_port,sizeof(ip_port),peer);
    portable_mutex_unlock(&LP_peermutex);
    return(peer);
}

cJSON *LP_peerjson(struct LP_peerinfo *peer)
{
    cJSON *item = cJSON_CreateObject();
    jaddstr(item,"ipaddr",peer->ipaddr);
    jaddnum(item,"port",peer->port);
    if ( strcmp(peer->ipaddr,LP_myipaddr) == 0 )
    {
        jaddnum(item,"session",LP_sessionid);
        if ( LP_mypeer != 0 )
            jaddnum(item,"numutxos",LP_mypeer->numutxos);
    } else jaddnum(item,"session",peer->sessionid);
    //jaddnum(item,"profit",peer->profitmargin);
    return(item);
}

char *LP_peers()
{
    struct LP_peerinfo *peer,*tmp; cJSON *peersjson = cJSON_CreateArray();
    HASH_ITER(hh,LP_peerinfos,peer,tmp)
    {
        //if ( peer->errors < LP_MAXPEER_ERRORS )
            jaddi(peersjson,LP_peerjson(peer));
    }
    return(jprint(peersjson,1));
}

struct LP_peerinfo *LP_addpeer(struct LP_peerinfo *mypeer,int32_t mypubsock,char *ipaddr,uint16_t port,uint16_t pushport,uint16_t subport,int32_t numpeers,int32_t numutxos,uint32_t sessionid)
{
    uint32_t ipbits; int32_t pushsock,subsock,timeout; char checkip[64],pushaddr[64],subaddr[64]; struct LP_peerinfo *peer = 0;
    printf("addpeer (%s:%u)\n",ipaddr,port);
#ifdef LP_STRICTPEERS
    if ( strncmp("5.9.253",ipaddr,strlen("5.9.253")) != 0 )
        return(0);
#endif
    ipbits = (uint32_t)calc_ipbits(ipaddr);
    expand_ipbits(checkip,ipbits);
    if ( strcmp(checkip,ipaddr) == 0 )
    {
        if ( (peer= LP_peerfind(ipbits,port)) != 0 )
        {
            /*if ( numpeers > peer->numpeers )
                peer->numpeers = numpeers;
            if ( numutxos > peer->numutxos )
                peer->numutxos = numutxos;
            if ( peer->sessionid == 0 )
                peer->sessionid = sessionid;*/
        }
        else
        {
            peer = calloc(1,sizeof(*peer));
            if ( strcmp(peer->ipaddr,LP_myipaddr) == 0 )
                peer->sessionid = LP_sessionid;
            else peer->sessionid = sessionid;
            peer->pushsock = peer->subsock = pushsock = subsock = -1;
            strcpy(peer->ipaddr,ipaddr);
            if ( pushport != 0 && subport != 0 && (pushsock= nn_socket(AF_SP,NN_PUSH)) >= 0 )
            {
                nanomsg_transportname(0,pushaddr,peer->ipaddr,pushport);
                if ( nn_connect(pushsock,pushaddr) >= 0 )
                {
                    timeout = 1;
                    nn_setsockopt(pushsock,NN_SOL_SOCKET,NN_SNDTIMEO,&timeout,sizeof(timeout));
                    //maxsize = 2 * 1024 * 1024;
                    //nn_setsockopt(pushsock,NN_SOL_SOCKET,NN_SNDBUF,&maxsize,sizeof(maxsize));
                    printf("connected to push.(%s) %d\n",pushaddr,pushsock);
                    peer->connected = (uint32_t)time(NULL);
                    peer->pushsock = pushsock;
                    if ( (subsock= nn_socket(AF_SP,NN_SUB)) >= 0 )
                    {
                        timeout = 1;
                        nn_setsockopt(subsock,NN_SOL_SOCKET,NN_RCVTIMEO,&timeout,sizeof(timeout));
                        nn_setsockopt(subsock,NN_SUB,NN_SUB_SUBSCRIBE,"",0);
                        nanomsg_transportname(0,subaddr,peer->ipaddr,subport);
                        if ( nn_connect(subsock,subaddr) >= 0 )
                        {
                            peer->subsock = subsock;
                            printf("connected to sub.(%s) %d\n",subaddr,peer->subsock);
                        } else nn_close(subsock);
                    }
                }
                else
                {
                    nn_close(pushsock);
                    printf("error connecting to push.(%s)\n",pushaddr);
                }
            } else printf("%s pushport.%u subport.%u pushsock.%d\n",ipaddr,pushport,subport,pushsock);
            //peer->profitmargin = profitmargin;
            peer->ipbits = ipbits;
            peer->port = port;
            peer->ip_port = ((uint64_t)port << 32) | ipbits;
            portable_mutex_lock(&LP_peermutex);
            HASH_ADD(hh,LP_peerinfos,ip_port,sizeof(peer->ip_port),peer);
            if ( mypeer != 0 )
            {
                mypeer->numpeers++;
                printf("_LPaddpeer %s -> numpeers.%d mypubsock.%d other.(%d %d)\n",ipaddr,mypeer->numpeers,mypubsock,numpeers,numutxos);
            } else peer->numpeers = 1; // will become mypeer
            portable_mutex_unlock(&LP_peermutex);
            if ( IAMLP != 0 && mypubsock >= 0 )
            {
                struct iguana_info *coin,*ctmp; bits256 zero; char *msg,busaddr[64];
                msg = jprint(LP_peerjson(peer),1);
                memset(zero.bytes,0,sizeof(zero));
                //LP_send(mypubsock,msg,(int32_t)strlen(msg)+1,1);
                LP_broadcast_message(mypubsock,"","",zero,msg);
                if ( 0 )
                {
                    HASH_ITER(hh,LP_coins,coin,ctmp)
                    {
                        if ( coin->bussock >= 0 )
                        {
                            nanomsg_transportname(0,busaddr,peer->ipaddr,coin->busport);
                            nn_connect(coin->bussock,busaddr);
                        }
                    }
                }
            }
        }
    } else printf("LP_addpeer: checkip.(%s) vs (%s)\n",checkip,ipaddr);
    return(peer);
}

int32_t LP_coinbus(uint16_t coin_busport)
{
    struct LP_peerinfo *peer,*tmp; char busaddr[64]; int32_t timeout,bussock = -1;
    return(-1);
    if ( IAMLP != 0 && LP_mypeer != 0 && (bussock= nn_socket(AF_SP,NN_BUS)) >= 0 )
    {
        timeout = 1;
        nn_setsockopt(bussock,NN_SOL_SOCKET,NN_SNDTIMEO,&timeout,sizeof(timeout));
        nn_setsockopt(bussock,NN_SOL_SOCKET,NN_RCVTIMEO,&timeout,sizeof(timeout));
        nanomsg_transportname(0,busaddr,LP_mypeer->ipaddr,coin_busport);
        if ( nn_bind(bussock,busaddr) < 0 )
        {
            printf("error binding to coin_busport.%s\n",busaddr);
            nn_close(bussock);
        }
        else
        {
            HASH_ITER(hh,LP_peerinfos,peer,tmp)
            {
                if ( LP_mypeer->port != peer->port || strcmp(LP_mypeer->ipaddr,peer->ipaddr) != 0 )
                {
                    nanomsg_transportname(0,busaddr,peer->ipaddr,coin_busport);
                    nn_connect(bussock,busaddr);
                }
            }
        }
    }
    return(bussock);
}

int32_t LP_peersparse(struct LP_peerinfo *mypeer,int32_t mypubsock,char *destipaddr,uint16_t destport,char *retstr,uint32_t now)
{
    struct LP_peerinfo *peer; uint32_t argipbits; char *argipaddr; uint16_t argport,pushport,subport; cJSON *array,*item; int32_t i,n=0;
    if ( (array= cJSON_Parse(retstr)) != 0 )
    {
        if ( (n= cJSON_GetArraySize(array)) > 0 )
        {
            for (i=0; i<n; i++)
            {
                item = jitem(array,i);
                if ( (argipaddr= jstr(item,"ipaddr")) != 0 && (argport= juint(item,"port")) != 0 )
                {
                    if ( (pushport= juint(item,"push")) == 0 )
                        pushport = argport + 1;
                    if ( (subport= juint(item,"sub")) == 0 )
                        subport = argport + 2;
                    argipbits = (uint32_t)calc_ipbits(argipaddr);
                    if ( (peer= LP_peerfind(argipbits,argport)) == 0 )
                    {
                        peer = LP_addpeer(mypeer,mypubsock,argipaddr,argport,pushport,subport,jint(item,"numpeers"),jint(item,"numutxos"),juint(item,"session"));
                    }
                    if ( peer != 0 )
                    {
                        peer->lasttime = now;
                        if ( strcmp(argipaddr,destipaddr) == 0 && destport == argport && peer->numpeers != n )
                            peer->numpeers = n;
                    }
                }
            }
        }
        free_json(array);
    }
    return(n);
}

void LP_peersquery(struct LP_peerinfo *mypeer,int32_t mypubsock,char *destipaddr,uint16_t destport,char *myipaddr,uint16_t myport)
{
    char *retstr; struct LP_peerinfo *peer,*tmp; uint32_t now,flag = 0;
    peer = LP_peerfind((uint32_t)calc_ipbits(destipaddr),destport);
    if ( (retstr= issue_LP_getpeers(destipaddr,destport,myipaddr,myport,mypeer!=0?mypeer->numpeers:0,mypeer!=0?mypeer->numutxos:0)) != 0 )
    {
        //printf("got.(%s)\n",retstr);
        now = (uint32_t)time(NULL);
        LP_peersparse(mypeer,mypubsock,destipaddr,destport,retstr,now);
        free(retstr);
        if ( IAMLP != 0 )
        {
            HASH_ITER(hh,LP_peerinfos,peer,tmp)
            {
                if ( peer->lasttime != now )
                {
                    printf("{%s:%u}.%d ",peer->ipaddr,peer->port,peer->lasttime - now);
                    flag++;
                    if ( (retstr= issue_LP_notify(destipaddr,destport,peer->ipaddr,peer->port,peer->numpeers,0,peer->sessionid)) != 0 )
                        free(retstr);
                }
            }
            if ( flag != 0 )
                printf(" <- missing peers\n");
        }
    }
}

int32_t LP_numpeers()
{
    struct LP_peerinfo *peer,*tmp; int32_t numpeers = 0;
    HASH_ITER(hh,LP_peerinfos,peer,tmp)
    {
        numpeers++;
    }
    return(numpeers);
}

uint16_t LP_randpeer(char *destip)
{
    struct LP_peerinfo *peer,*tmp; uint16_t port = 0; int32_t n,r,numpeers = 0;
    HASH_ITER(hh,LP_peerinfos,peer,tmp)
    {
        numpeers++;
    }
    if ( numpeers > 0 )
    {
        r = rand() % numpeers;
        n = 0;
        HASH_ITER(hh,LP_peerinfos,peer,tmp)
        {
            if ( n++ == r )
            {
                strcpy(destip,peer->ipaddr);
                port = peer->port;
                break;
            }
        }
    }
    return(port);
}