[rpc] Add abortrescan command to RPC interface.

src/wallet/rpcdump.cpp

@@ -155,6 +155,29 @@ UniValue importprivkey(const UniValue& params, bool fHelp)
     return NullUniValue;
 }
 
+UniValue abortrescan(const UniValue& params, bool fHelp)
+{
+    if (!EnsureWalletIsAvailable(fHelp))
+        return NullUniValue;
+
+    if (fHelp || params.size() > 0)
+        throw runtime_error(
+            "abortrescan\n"
+            "\nStops current wallet rescan triggered e.g. by an importprivkey call.\n"
+            "\nExamples:\n"
+            "\nImport a private key\n"
+            + HelpExampleCli("importprivkey", "\"mykey\"") +
+            "\nAbort the running wallet rescan\n"
+            + HelpExampleCli("abortrescan", "") +
+            "\nAs a JSON-RPC call\n"
+            + HelpExampleRpc("abortrescan", "")
+        );
+
+    if (!pwallet->IsScanning() || pwallet->IsAbortingRescan()) return false;
+    pwallet->AbortRescan();
+    return true;
+}
+
 void ImportAddress(const CTxDestination& dest, const string& strLabel);
 void ImportScript(const CScript& script, const string& strLabel, bool isRedeemScript)
 {

src/wallet/rpcwallet.cpp

@@ -2611,6 +2611,7 @@ UniValue fundrawtransaction(const UniValue& params, bool fHelp)
     return result;
 }
 
+extern UniValue abortrescan(const UniValue& params, bool fHelp); // in rpcdump.cpp
 extern UniValue dumpprivkey(const UniValue& params, bool fHelp); // in rpcdump.cpp
 extern UniValue importprivkey(const UniValue& params, bool fHelp);
 extern UniValue importaddress(const UniValue& params, bool fHelp);
@@ -2626,6 +2627,7 @@ static const CRPCCommand commands[] =
     { "rawtransactions",    "fundrawtransaction",       &fundrawtransaction,       false },
     { "hidden",             "resendwallettransactions", &resendwallettransactions, true  },
     { "wallet",             "abandontransaction",       &abandontransaction,       false },
+    { "wallet",             "abortrescan",              &abortrescan,              false },
     { "wallet",             "addmultisigaddress",       &addmultisigaddress,       true  },
     { "wallet",             "backupwallet",             &backupwallet,             true  },
     { "wallet",             "dumpprivkey",              &dumpprivkey,              true  },