[rpc] Add abortrescan command to RPC interface.

src/wallet/rpcdump.cpp

@@ -154,6 +154,31 @@ UniValue importprivkey(const JSONRPCRequest& request)
     return NullUniValue;
 }
 
+UniValue abortrescan(const JSONRPCRequest& request)
+{
+    CWallet* const pwallet = GetWalletForJSONRPCRequest(request);
+    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
+        return NullUniValue;
+    }
+
+    if (request.fHelp || request.params.size() > 0)
+        throw std::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(CWallet*, const CBitcoinAddress& address, const std::string& strLabel);
 void ImportScript(CWallet* const pwallet, const CScript& script, const std::string& strLabel, bool isRedeemScript)
 {