Merge #15990: Add tests and documentation for blocksonly

fa8ced32a60dea37ac169241cf9a1f708ef46c4b doc: Mention blocksonly in reduce-traffic.md, unhide option (MarcoFalke)
fa320de79faaca2b088fcbe7f76701faa9bff236 test: Add test for p2p_blocksonly (MarcoFalke)
fa3872e7b4540857261aed948b94b6b2bfdbc3d1 test: Format predicate source as multiline on error (MarcoFalke)
fa1dce7329d3e74d46ab98b93772b1832a3f1819 net: Rename ::fRelayTxes to ::g_relay_txes (MarcoFalke)

Pull request description:

  This is de-facto no longer hidden

ACKs for commit fa8ced:
  jamesob:
    utACK https://github.com/bitcoin/bitcoin/commit/fa8ced32a60dea37ac169241cf9a1f708ef46c4b

Tree-SHA512: 474fbdee6cbd035ed9068a066b6056c1f909ec7520be0417820fcd1672ab3069b53f55c5147968978d9258fd3a3933fe1a9ef8e4f6e14fb6ebbd79701a0a1245

5 files changed, 8 insertions, 8 deletions

diff --git a/src/init.cpp b/src/init.cpp
index c5deb12bd4..944200e24d 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -383,7 +383,7 @@ void SetupServerArgs()
     gArgs.AddArg("-blocksdir=<dir>", "Specify directory to hold blocks subdirectory for *.dat files (default: <datadir>)", false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-blocknotify=<cmd>", "Execute command when the best block changes (%s in cmd is replaced by block hash)", false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-blockreconstructionextratxn=<n>", strprintf("Extra transactions to keep in memory for compact block reconstructions (default: %u)", DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN), false, OptionsCategory::OPTIONS);
-    gArgs.AddArg("-blocksonly", strprintf("Whether to operate in a blocks only mode (default: %u)", DEFAULT_BLOCKSONLY), true, OptionsCategory::OPTIONS);
+    gArgs.AddArg("-blocksonly", strprintf("Whether to reject transactions from network peers. Transactions from the wallet or RPC are not affected. (default: %u)", DEFAULT_BLOCKSONLY), false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-conf=<file>", strprintf("Specify configuration file. Relative paths will be prefixed by datadir location. (default: %s)", BITCOIN_CONF_FILENAME), false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-datadir=<dir>", "Specify data directory", false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-dbbatchsize", strprintf("Maximum database write batch size in bytes (default: %u)", nDefaultDbBatchSize), true, OptionsCategory::OPTIONS);
@@ -1426,7 +1426,7 @@ bool AppInitMain(InitInterfaces& interfaces)
     // see Step 2: parameter interactions for more information about these
     fListen = gArgs.GetBoolArg("-listen", DEFAULT_LISTEN);
     fDiscover = gArgs.GetBoolArg("-discover", true);
-    fRelayTxes = !gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY);
+    g_relay_txes = !gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY);
 
     for (const std::string& strAddr : gArgs.GetArgs("-externalip")) {
         CService addrLocal;
diff --git a/src/net.cpp b/src/net.cpp
index 1335804b06..3c6f5a05f3 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -79,7 +79,7 @@ static const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL; // S
 //
 bool fDiscover = true;
 bool fListen = true;
-bool fRelayTxes = true;
+bool g_relay_txes = !DEFAULT_BLOCKSONLY;
 CCriticalSection cs_mapLocalHost;
 std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
 static bool vfLimited[NET_MAX] GUARDED_BY(cs_mapLocalHost) = {};
diff --git a/src/net.h b/src/net.h
index 7af33ef13b..37aaf1a63b 100644
--- a/src/net.h
+++ b/src/net.h
@@ -519,7 +519,7 @@ CAddress GetLocalAddress(const CNetAddr *paddrPeer, ServiceFlags nLocalServices)
 
 extern bool fDiscover;
 extern bool fListen;
-extern bool fRelayTxes;
+extern bool g_relay_txes;
 
 /** Subversion as sent to the P2P network in `version` messages */
 extern std::string strSubVersion;
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index b3facdcd3a..cb2b9f8c03 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -422,7 +422,7 @@ static void PushNodeVersion(CNode *pnode, CConnman* connman, int64_t nTime)
     CAddress addrMe = CAddress(CService(), nLocalNodeServices);
 
     connman->PushMessage(pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalNodeServices, nTime, addrYou, addrMe,
-            nonce, strSubVersion, nNodeStartingHeight, ::fRelayTxes));
+            nonce, strSubVersion, nNodeStartingHeight, ::g_relay_txes));
 
     if (fLogIPs) {
         LogPrint(BCLog::NET, "send version message: version %d, blocks=%d, us=%s, them=%s, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), addrYou.ToString(), nodeid);
@@ -2189,7 +2189,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
             return false;
         }
 
-        bool fBlocksOnly = !fRelayTxes;
+        bool fBlocksOnly = !g_relay_txes;
 
         // Allow whitelisted peers to send data other than blocks in blocks only mode if whitelistrelay is true
         if (pfrom->fWhitelisted && gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY))
@@ -2445,7 +2445,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
     if (strCommand == NetMsgType::TX) {
         // Stop processing the transaction early if
         // We are in blocks only mode and peer is either not whitelisted or whitelistrelay is off
-        if (!fRelayTxes && (!pfrom->fWhitelisted || !gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)))
+        if (!g_relay_txes && (!pfrom->fWhitelisted || !gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)))
         {
             LogPrint(BCLog::NET, "transaction sent in violation of protocol peer=%d\n", pfrom->GetId());
             return true;
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index e8cdce623c..e49c3e031f 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -496,7 +496,7 @@ static UniValue getnetworkinfo(const JSONRPCRequest& request)
     obj.pushKV("protocolversion",PROTOCOL_VERSION);
     if(g_connman)
         obj.pushKV("localservices", strprintf("%016x", g_connman->GetLocalServices()));
-    obj.pushKV("localrelay",     fRelayTxes);
+    obj.pushKV("localrelay", g_relay_txes);
     obj.pushKV("timeoffset",    GetTimeOffset());
     if (g_connman) {
         obj.pushKV("networkactive", g_connman->GetNetworkActive());