Cache electrum tx history only when it's enabled explicitly in argjson.

This feature is used by AtomicDEX GUI only so I disable it by default.

iguana/exchanges/LP_commands.c

@@ -717,6 +717,7 @@ version\n\
                 if ( (ptr= LP_coinsearch(coin)) != 0 )
                 {
                     ptr->inactive = 0;
+                    ptr->cache_history = juint(argjson, "cache_history");
                     return(jprint(LP_electrumserver(ptr,jstr(argjson,"ipaddr"),juint(argjson,"port")),1));
                 } else return(clonestr("{\"error\":\"cant find coind\"}"));
             }

iguana/exchanges/LP_include.h

@@ -337,8 +337,9 @@ struct iguana_info
     uint64_t txfee,do_autofill_merge;
     int32_t numutxos,notarized,longestchain,firstrefht,firstscanht,lastscanht,height; uint16_t busport,did_addrutxo_reset;
     uint32_t txversion,dPoWtime,lastautosplit,lastresetutxo,loadedcache,electrumlist,lastunspent,importedprivkey,lastpushtime,lastutxosync,addr_listunspent_requested,lastutxos,updaterate,counter,inactive,lastmempool,lastgetinfo,ratetime,heighttime,lastmonitor,obooktime;
-    uint8_t pubtype,p2shtype,isPoS,wiftype,wiftaddr,taddr,noimportprivkey_flag,userconfirms,isassetchain,maxconfirms;
+    uint8_t pubtype,p2shtype,isPoS,wiftype,wiftaddr,taddr,noimportprivkey_flag,userconfirms,isassetchain,maxconfirms,cache_history;
     char symbol[128],smartaddr[64],userpass[1024],serverport[128],instantdex_address[64],estimatefeestr[32],getinfostr[32],etomic[64],validateaddress[64];
+    struct LP_tx_history_item *tx_history;
     // portfolio
     double price_kmd,force,perc,goal,goalperc,relvolume,rate;
     void *electrum; void *ctx;
@@ -348,7 +349,6 @@ struct iguana_info
     void *curl_handle; portable_mutex_t curl_mutex;
     bits256 cachedtxid,notarizationtxid; uint8_t *cachedtxiddata; int32_t cachedtxidlen;
     bits256 cachedmerkle,notarizedhash; int32_t cachedmerkleheight;
-    struct LP_tx_history_item *tx_history;
 };
 
 struct _LP_utxoinfo { bits256 txid; uint64_t value; int32_t height; uint32_t vout:30,suppress:1,pad:1; };

iguana/exchanges/LP_socket.c

@@ -1502,7 +1502,7 @@ cJSON *LP_electrumserver(struct iguana_info *coin,char *ipaddr,uint16_t port)
         cJSON_Delete(balance);
     }
 #endif
-    if (coin->electrum != 0 && cur == 0) {
+    if (coin->cache_history > 0 && coin->electrum != 0 && cur == 0) {
         if ( OS_thread_create(malloc(sizeof(pthread_t)),NULL,(void *)LP_electrum_txhistory_loop,(void *)coin) != 0 )
         {
             printf("error launching LP_electrum_tx_history_loop %s.(%s:%u)\n",coin->symbol,ep->ipaddr,ep->port);