Add mocknet helpers (#1273)

* Add mocknet helpers

* Update chainparams.cpp

.gitignore

@@ -79,6 +79,7 @@ src/univalue/gen
 # Only ignore unexpected patches
 *.patch
 !depends/patches/**/*.patch
+!contrib/devtools/*.patch
 
 #libtool object files
 *.lo

contrib/devtools/mocknet.patch

@@ -0,0 +1,38 @@
+diff --git a/src/pos.cpp b/src/pos.cpp
+index 1ad8d066d..01b13b8aa 100644
+--- a/src/pos.cpp
++++ b/src/pos.cpp
+@@ -140,6 +140,11 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, int64_t blockTim
+
+     unsigned int nProofOfWorkLimit = UintToArith256(params.pos.diffLimit).GetCompact();
+
++    // Lower difficulty fork for mock network testing
++    if (fMockNetwork) {
++        return nProofOfWorkLimit;
++    }
++
+     int nHeight{pindexLast->nHeight + 1};
+     bool newDifficultyAdjust{nHeight > params.EunosHeight};
+
+diff --git a/src/version.h b/src/version.h
+index 3ab303d56..fb84cea92 100644
+--- a/src/version.h
++++ b/src/version.h
+@@ -9,7 +9,7 @@
+  * network protocol versioning
+  */
+
+-static const int PROTOCOL_VERSION = 70029;
++static const int PROTOCOL_VERSION = 100000;
+
+ //! initial proto version, to be increased after version/verack negotiation
+ static const int INIT_PROTO_VERSION = 209;
+@@ -18,7 +18,7 @@ static const int INIT_PROTO_VERSION = 209;
+ static const int GETHEADERS_VERSION = 31800;
+
+ //! disconnect from peers older than this proto version
+-static const int MIN_PEER_PROTO_VERSION = 70023;
++static const int MIN_PEER_PROTO_VERSION = 100000;
+
+ //! nTime field added to CAddress, starting with this version;
+ //! if possible, avoid requesting addresses nodes older than this

src/chainparams.cpp

@@ -19,6 +19,10 @@
 #include <boost/algorithm/string/split.hpp>
 #include <boost/algorithm/string/case_conv.hpp>
 
+bool fMockNetwork = false;
+std::string sMockFoundationPubKey;
+uint64_t nMockBlockTimeSecs = 0;
+
 std::vector<CTransactionRef> CChainParams::CreateGenesisMasternodes()
 {
     std::vector<CTransactionRef> mnTxs;
@@ -325,6 +329,15 @@ class CMainParams : public CChainParams {
             /* nTxCount */ 1091894,
             /* dTxRate  */ 0.1841462153145931
         };
+
+        if (fMockNetwork) {
+            consensus.pos.nTargetSpacing = nMockBlockTimeSecs;
+            consensus.pos.nTargetTimespanV2 = 10 * consensus.pos.nTargetSpacing;
+            // Add additional foundation members here for testing
+            if (!sMockFoundationPubKey.empty()) {
+                consensus.foundationMembers.insert(GetScriptForDestination(DecodeDestination(sMockFoundationPubKey, *this)));
+            }
+        }
     }
 };
 

src/chainparams.h

@@ -15,6 +15,12 @@
 #include <memory>
 #include <vector>
 
+
+/** Used for mocking network with low difficulty for testing */
+extern bool fMockNetwork;
+extern std::string sMockFoundationPubKey;
+extern uint64_t nMockBlockTimeSecs;
+
 struct SeedSpec6 {
     uint8_t addr[16];
     uint16_t port;

src/init.cpp

@@ -375,7 +375,9 @@ void SetupServerArgs()
 
     // Hidden Options
     std::vector<std::string> hidden_args = {
-        "-dbcrashratio", "-forcecompactdb", "-interrupt-block=<hash|height>", "-stop-block=<hash|height>",
+        "-dbcrashratio", "-forcecompactdb", 
+        "-interrupt-block=<hash|height>", "-stop-block=<hash|height>",
+        "-mocknet", "-mocknet-blocktime=<secs>", "-mocknet-key=<pubkey>"
         // GUI args. These will be overwritten by SetupUIArgs for the GUI
         "-choosedatadir", "-lang=<lang>", "-min", "-resetguisettings", "-splash"};
 
@@ -1218,6 +1220,11 @@ bool AppInitParameterInteraction()
     fIsFakeNet = Params().NetworkIDString() == "regtest" && gArgs.GetArg("-dummypos", false);
     CTxOut::SERIALIZE_FORCED_TO_OLD_IN_TESTS = Params().NetworkIDString() == "regtest" && gArgs.GetArg("-txnotokens", false);
 
+    fMockNetwork = gArgs.IsArgSet("-mocknet");
+    if (fMockNetwork) {
+        sMockFoundationPubKey = gArgs.GetArg("-mocknet-key", "");
+        nMockBlockTimeSecs = gArgs.GetArg("-mocknet-blocktime", 10);
+    }
     return true;
 }
 

test/lint/check-doc.py

@@ -23,7 +23,7 @@
 CMD_GREP_WALLET_HIDDEN_ARGS = r"git grep --function-context 'void DummyWalletInit::AddWalletOptions' -- {}".format(CMD_ROOT_DIR)
 CMD_GREP_DOCS = r"git grep --perl-regexp '{}' {}".format(REGEX_DOC, CMD_ROOT_DIR)
 # list unsupported, deprecated and duplicate args as they need no documentation
-SET_DOC_OPTIONAL = set(['-h', '-help', '-dbcrashratio', '-forcecompactdb', '-interrupt-block', '-stop-block'])
+SET_DOC_OPTIONAL = set(['-h', '-help', '-dbcrashratio', '-forcecompactdb', '-interrupt-block', '-stop-block', '-mocknet', '-mocknet-key', '-mocknet-blocktime'])
 
 
 def lint_missing_argument_documentation():