Removed main.h dependency from rpcserver.cpp

Rebased by @laanwj:

- update for RPC methods added since 84d13ee: setmocktime,
  invalidateblock, reconsiderblock. Only the first, setmocktime, required a change,
  the other two are thread safe.

src/rpcblockchain.cpp

@@ -105,6 +105,7 @@ Value getblockcount(const Array& params, bool fHelp)
             + HelpExampleRpc("getblockcount", "")
         );
 
+    LOCK(cs_main);
     return chainActive.Height();
 }
 
@@ -121,6 +122,7 @@ Value getbestblockhash(const Array& params, bool fHelp)
             + HelpExampleRpc("getbestblockhash", "")
         );
 
+    LOCK(cs_main);
     return chainActive.Tip()->GetBlockHash().GetHex();
 }
 
@@ -137,6 +139,7 @@ Value getdifficulty(const Array& params, bool fHelp)
             + HelpExampleRpc("getdifficulty", "")
         );
 
+    LOCK(cs_main);
     return GetDifficulty();
 }
 
@@ -173,6 +176,8 @@ Value getrawmempool(const Array& params, bool fHelp)
             + HelpExampleRpc("getrawmempool", "true")
         );
 
+    LOCK(cs_main);
+
     bool fVerbose = false;
     if (params.size() > 0)
         fVerbose = params[0].get_bool();
@@ -233,6 +238,8 @@ Value getblockhash(const Array& params, bool fHelp)
             + HelpExampleRpc("getblockhash", "1000")
         );
 
+    LOCK(cs_main);
+
     int nHeight = params[0].get_int();
     if (nHeight < 0 || nHeight > chainActive.Height())
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Block height out of range");
@@ -277,6 +284,8 @@ Value getblock(const Array& params, bool fHelp)
             + HelpExampleRpc("getblock", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"")
         );
 
+    LOCK(cs_main);
+
     std::string strHash = params[0].get_str();
     uint256 hash(uint256S(strHash));
 
@@ -326,6 +335,8 @@ Value gettxoutsetinfo(const Array& params, bool fHelp)
             + HelpExampleRpc("gettxoutsetinfo", "")
         );
 
+    LOCK(cs_main);
+
     Object ret;
 
     CCoinsStats stats;
@@ -380,6 +391,8 @@ Value gettxout(const Array& params, bool fHelp)
             + HelpExampleRpc("gettxout", "\"txid\", 1")
         );
 
+    LOCK(cs_main);
+
     Object ret;
 
     std::string strHash = params[0].get_str();
@@ -436,6 +449,8 @@ Value verifychain(const Array& params, bool fHelp)
             + HelpExampleRpc("verifychain", "")
         );
 
+    LOCK(cs_main);
+
     int nCheckLevel = GetArg("-checklevel", 3);
     int nCheckDepth = GetArg("-checkblocks", 288);
     if (params.size() > 0)
@@ -467,6 +482,8 @@ Value getblockchaininfo(const Array& params, bool fHelp)
             + HelpExampleRpc("getblockchaininfo", "")
         );
 
+    LOCK(cs_main);
+
     Object obj;
     obj.push_back(Pair("chain",                 Params().NetworkIDString()));
     obj.push_back(Pair("blocks",                (int)chainActive.Height()));
@@ -526,6 +543,8 @@ Value getchaintips(const Array& params, bool fHelp)
             + HelpExampleRpc("getchaintips", "")
         );
 
+    LOCK(cs_main);
+
     /* Build up a list of chain tips.  We start with the list of all
        known blocks, and successively remove blocks that appear as pprev
        of another block.  */