rpc: factor out RpcInterruptionPoint from dumptxoutset

src/rpc/blockchain.cpp

@@ -2329,9 +2329,7 @@ UniValue dumptxoutset(const JSONRPCRequest& request)
     unsigned int iter{0};
 
     while (pcursor->Valid()) {
-        if (iter % 5000 == 0 && !IsRPCRunning()) {
-            throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Shutting down");
-        }
+        if (iter % 5000 == 0) RpcInterruptionPoint();
         ++iter;
         if (pcursor->GetKey(key) && pcursor->GetValue(coin)) {
             afile << key;

src/rpc/server.cpp

@@ -11,9 +11,9 @@
 #include <util/strencodings.h>
 #include <util/system.h>
 
-#include <boost/signals2/signal.hpp>
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/split.hpp>
+#include <boost/signals2/signal.hpp>
 
 #include <memory> // for unique_ptr
 #include <unordered_map>
@@ -309,6 +309,11 @@ bool IsRPCRunning()
     return g_rpc_running;
 }
 
+void RpcInterruptionPoint()
+{
+    if (!IsRPCRunning()) throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Shutting down");
+}
+
 void SetRPCWarmupStatus(const std::string& newStatus)
 {
     LOCK(cs_rpcWarmup);

src/rpc/server.h

@@ -9,10 +9,10 @@
 #include <amount.h>
 #include <rpc/request.h>
 
+#include <functional>
 #include <map>
 #include <stdint.h>
 #include <string>
-#include <functional>
 
 #include <univalue.h>
 
@@ -29,6 +29,9 @@ namespace RPCServer
 /** Query whether RPC is running */
 bool IsRPCRunning();
 
+/** Throw JSONRPCError if RPC is not running */
+void RpcInterruptionPoint();
+
 /**
  * Set the RPC warmup status.  When this is done, all RPC calls will error out
  * immediately with RPC_IN_WARMUP.