rpc: implement getmininginfo.

lib/bcoin/http/rpc.js

@@ -1132,9 +1132,37 @@ RPC.prototype.getblocktemplate = function getblocktemplate(args, callback) {
 };
 
 RPC.prototype.getmininginfo = function getmininginfo(args, callback) {
+  var self = this;
+
   if (args.help || args.length !== 0)
     return callback(new Error('getmininginfo'));
-  callback(new Error('Not implemented.'));
+
+  this.chain.getBlock(this.chain.tip.hash, function(err, block) {
+    if (err)
+      return callback(err);
+
+    if (!block)
+      return callback(new Error('Block not found.'));
+
+    self._hashps(120, -1, function(err, hashps) {
+      if (err)
+        return callback(err);
+
+      callback(null, {
+        blocks: self.chain.height,
+        currentblocksize: block.getSize(),
+        currentblocktx: block.txs.length,
+        difficulty: self._getDifficulty(),
+        errors: '',
+        genproclimit: self.proclimit,
+        networkhashps: hashps,
+        pooledtx: self.mempool.total,
+        testnet: self.network.type !== 'main',
+        chain: self.network.type,
+        generate: self.mining
+      });
+    });
+  });
 };
 
 RPC.prototype.getnetworkhashps = function getnetworkhashps(args, callback) {