Add support for getblockchaininfo rpc cmd

-sync.supply setting now allows getting moneysupply from getblockchaininfo cmd
-README updated with info abour getblockchaininfo cmd

README.md

@@ -175,6 +175,7 @@ Table of Contents
   - **getblock:** Returns an object with information about the block
   - **getrawtransaction:** Returns raw transaction data
   - **getinfo:** Returns an object containing various state info
+  - **getblockchaininfo:** Returns an object containing various state info regarding blockchain processing
   - **getpeerinfo:** Returns data about each connected network node as a json array of objects
   - **gettxoutsetinfo:** Returns an object with statistics about the unspent transaction output set
   - **getvotelist:** Returns an object with details regarding the current vote list

lib/explorer.js

@@ -908,6 +908,34 @@ module.exports = {
         // cmd not in use. return null.
         return cb(null);
       }
+    } else if (settings.sync.supply == 'GETBLOCKCHAININFO') {
+      // attempt to get the supply from the getblockchaininfo or similar api cmd that returns and object containing various state info. Must include a value called "moneysupply" which represents the current running total of coins
+      var cmd = prepareRpcCommand(settings.api_cmds.getblockchaininfo);
+
+      if (!(cmd.method == '' && cmd.parameters.length == 0)) {
+        if (settings.api_cmds.use_rpc) {
+          rpcCommand([{method:cmd.method, parameters: cmd.parameters}], function(response) {
+            // check if an error msg was received from the rpc server
+            if (!response || !response.moneysupply || response == 'There was an error. Check your console.')
+              return cb(null);
+            else
+              return cb(response.moneysupply);
+          });
+        } else {
+          var uri = base_url + 'getblockchaininfo';
+
+          request({uri: uri, json: true}, function (error, response, body) {
+            // check if an error msg was received from the web api server
+            if (!body || !body.moneysupply ||body == 'There was an error. Check your console.')
+              return cb(null);
+            else
+              return cb(body.moneysupply);
+          });
+        }
+      } else {
+        // cmd not in use. return null.
+        return cb(null);
+      }
     } else {
       // returns coinbase total sent as current coin supply
       coinbase_supply(function(supply) {

lib/nodeapi.js

@@ -43,6 +43,7 @@ module.exports = function() {
         case 'getrawtransaction':
         case 'getsupply':
         case 'getinfo':
+        case 'getblockchaininfo':
         case 'getpeerinfo':
         case 'gettxoutsetinfo':
         case 'getmaxmoney':
@@ -156,6 +157,7 @@ module.exports = function() {
         case 'getconnectioncount':
         case 'getblockcount':
         case 'getinfo':
+        case 'getblockchaininfo':
         case 'getpeerinfo':
         case 'gettxoutsetinfo':
         case 'getvotelist':

lib/settings.js

@@ -1123,6 +1123,7 @@ exports.sync = {
   //         Valid options:
   //         COINBASE : retrieve the total coins sent from the coinbase (Often used for PoW coins)
   //         GETINFO : retrieved from getinfo rpc cmd (Often used for PoS coins)
+  //         GETBLOCKCHAININFO : retrieved from getblockchaininfo rpc cmd
   //         HEAVY: retrieved from getsupply rpc cmd (The "blockchain_specific.heavycoin.enabled" setting must be set to true and the "blockchain_specific.heavycoin.api_cmds.getsupply" setting must be set up correctly for this option to work properly)
   //         BALANCES : get the supply by running a query on the addresses collection and summing up all positive balances (potentially a long running query for blockchains with tons of addresses)
   //         TXOUTSET : retrieved from gettxoutsetinfo rpc cmd
@@ -1160,6 +1161,8 @@ exports.api_cmds = {
   "getrawtransaction": "getrawtransaction",
   // getinfo: Returns an object containing various state info
   "getinfo": "getinfo",
+  // getblockchaininfo: Returns an object containing various state info regarding blockchain processing
+  "getblockchaininfo": "getblockchaininfo",
   // getpeerinfo: Returns data about each connected network node as a json array of objects
   "getpeerinfo": "getpeerinfo",
   // gettxoutsetinfo: Returns an object with statistics about the unspent transaction output set

settings.json.template

@@ -1207,6 +1207,7 @@
     //         Valid options:
     //         COINBASE : retrieve the total coins sent from the coinbase (Often used for PoW coins)
     //         GETINFO : retrieved from getinfo rpc cmd (Often used for PoS coins)
+    //         GETBLOCKCHAININFO : retrieved from getblockchaininfo rpc cmd
     //         HEAVY: retrieved from getsupply rpc cmd (The "blockchain_specific.heavycoin.enabled" setting must be set to true and the "blockchain_specific.heavycoin.api_cmds.getsupply" setting must be set up correctly for this option to work properly)
     //         BALANCES : get the supply by running a query on the addresses collection and summing up all positive balances (potentially a long running query for blockchains with tons of addresses)
     //         TXOUTSET : retrieved from gettxoutsetinfo rpc cmd
@@ -1277,6 +1278,8 @@
     "getrawtransaction": "getrawtransaction",
     // getinfo: Returns an object containing various state info
     "getinfo": "getinfo",
+    // getblockchaininfo: Returns an object containing various state info regarding blockchain processing
+    "getblockchaininfo": "getblockchaininfo",
     // getpeerinfo: Returns data about each connected network node as a json array of objects
     "getpeerinfo": "getpeerinfo",
     // gettxoutsetinfo: Returns an object with statistics about the unspent transaction output set