Check networkhashps

src/rpcmining.cpp

@@ -11,6 +11,55 @@
 using namespace json_spirit;
 using namespace std;
 
+Value GetNetworkHashPS(int lookup, int height) {
+    CBlockIndex *pb = pindexBest;
+
+    if (height >= 0 && height < nBestHeight)
+        pb = FindBlockByHeight(height);
+
+    if (pb == NULL || !pb->nHeight)
+        return 0;
+
+    // If lookup is -1, then use blocks since last difficulty change.
+    if (lookup <= 0)
+        lookup = pb->nHeight % 2016 + 1;
+
+    // If lookup is larger than chain, then set it to chain length.
+    if (lookup > pb->nHeight)
+        lookup = pb->nHeight;
+
+    CBlockIndex *pb0 = pb;
+    int64 minTime = pb0->GetBlockTime();
+    int64 maxTime = minTime;
+    for (int i = 0; i < lookup; i++) {
+        pb0 = pb0->pprev;
+        int64 time = pb0->GetBlockTime();
+        minTime = std::min(time, minTime);
+        maxTime = std::max(time, maxTime);
+    }
+
+    // In case there's a situation where minTime == maxTime, we don't want a divide by zero exception.
+    if (minTime == maxTime)
+        return 0;
+
+    uint256 workDiff = pb->nChainWork - pb0->nChainWork;
+    int64 timeDiff = maxTime - minTime;
+
+    return (boost::int64_t)(workDiff.getdouble() / timeDiff);
+}
+
+Value getnetworkhashps(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() > 2)
+        throw runtime_error(
+            "getnetworkhashps [blocks] [height]\n"
+            "Returns the estimated network hashes per second based on the last 120 blocks.\n"
+            "Pass in [blocks] to override # of blocks, -1 specifies since last difficulty change.\n"
+            "Pass in [height] to estimate the network speed at the time when a certain block was found.");
+
+    return GetNetworkHashPS(params.size() > 0 ? params[0].get_int() : 120, params.size() > 1 ? params[1].get_int() : -1);
+}
+
 Value getgenerate(const Array& params, bool fHelp)
 {
     if (fHelp || params.size() != 0)
@@ -77,6 +126,7 @@ Value getmininginfo(const Array& params, bool fHelp)
     obj.push_back(Pair("generate",      GetBoolArg("-gen")));
     obj.push_back(Pair("genproclimit",  (int)GetArg("-genproclimit", -1)));
     obj.push_back(Pair("hashespersec",  gethashespersec(params, false)));
+    obj.push_back(Pair("networkhashps", getnetworkhashps(params, false)));
     obj.push_back(Pair("pooledtx",      (uint64_t)mempool.size()));
     obj.push_back(Pair("testnet",       fTestNet));
     return obj;