Auto merge of #2839 - arcalinea:add_deprecation_alert, r=bitcartel

Add getdeprecationinfo RPC method to return deprecation block height

Closes #2828

Returns:
```
{
  "version": xxxxx,                      (numeric) the server version
  "subversion": "/MagicBean:x.y.z[-v]/",     (string) the server subversion string
  "deprecationheight": xxxxx,            (numeric) the deprecation block height
}
```

src/rpcnet.cpp

@@ -13,6 +13,7 @@
 #include "timedata.h"
 #include "util.h"
 #include "version.h"
+#include "deprecation.h"
 
 #include <boost/foreach.hpp>
 
@@ -398,6 +399,33 @@ static UniValue GetNetworksInfo()
     return networks;
 }
 
+UniValue getdeprecationinfo(const UniValue& params, bool fHelp)
+{
+    const CChainParams& chainparams = Params();
+    if (fHelp || params.size() != 0 || chainparams.NetworkIDString() != "main")
+        throw runtime_error(
+            "getdeprecationinfo\n"
+            "Returns an object containing current version and deprecation block height. Applicable only on mainnet.\n"
+            "\nResult:\n"
+            "{\n"
+            "  \"version\": xxxxx,                      (numeric) the server version\n"
+            "  \"subversion\": \"/MagicBean:x.y.z[-v]/\",     (string) the server subversion string\n"
+            "  \"deprecationheight\": xxxxx,            (numeric) the block height at which this version will deprecate and shut down (unless -disabledeprecation is set)\n"
+            "}\n"
+            "\nExamples:\n"
+            + HelpExampleCli("getdeprecationinfo", "")
+            + HelpExampleRpc("getdeprecationinfo", "")
+        );
+
+    UniValue obj(UniValue::VOBJ);
+    obj.push_back(Pair("version", CLIENT_VERSION));
+    obj.push_back(Pair("subversion",
+        FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, std::vector<string>())));
+    obj.push_back(Pair("deprecationheight", DEPRECATION_HEIGHT));
+
+    return obj;
+}
+
 UniValue getnetworkinfo(const UniValue& params, bool fHelp)
 {
     if (fHelp || params.size() != 0)

src/rpcserver.cpp

@@ -265,6 +265,7 @@ static const CRPCCommand vRPCCommands[] =
 
     /* P2P networking */
     { "network",            "getnetworkinfo",         &getnetworkinfo,         true  },
+    { "network",            "getdeprecationinfo",     &getdeprecationinfo,     true  },
     { "network",            "addnode",                &addnode,                true  },
     { "network",            "disconnectnode",         &disconnectnode,         true  },
     { "network",            "getaddednodeinfo",       &getaddednodeinfo,       true  },

src/rpcserver.h

@@ -238,6 +238,7 @@ extern UniValue getinfo(const UniValue& params, bool fHelp);
 extern UniValue getwalletinfo(const UniValue& params, bool fHelp);
 extern UniValue getblockchaininfo(const UniValue& params, bool fHelp);
 extern UniValue getnetworkinfo(const UniValue& params, bool fHelp);
+extern UniValue getdeprecationinfo(const UniValue& params, bool fHelp);
 extern UniValue setmocktime(const UniValue& params, bool fHelp);
 extern UniValue resendwallettransactions(const UniValue& params, bool fHelp);
 extern UniValue zc_benchmark(const UniValue& params, bool fHelp);