Working python bindings

Signed-off-by: Anthony Fieroni <bvbfan@abv.bg>

src/claimtrie/CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.10)
 
 project(claimtrie)
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
 include(../../contrib/cmake/cmake/CPM.cmake)
@@ -12,90 +12,43 @@ set(CLAIMTRIE_SRC
     forks.cpp
     hashes.cpp
     log.cpp
-    prefixtrie.cpp
     trie.cpp
     txoutpoint.cpp
     uints.cpp
+    sqlite/sqlite3.c
 )
 
+if(BIND)
+    find_program(SWIG NAMES swig)
+    string(TOLOWER ${BIND} BIND)
+    set(INTERFACE_NAME libclaimtrie)
+    if(${BIND} STREQUAL "python")
+        find_package(PythonInterp 3.6 REQUIRED)
+        find_package(PythonLibs 3.6 REQUIRED)
+        set(BIND_INCLUDE_DIRS ${PYTHON_INCLUDE_DIRS})
+        set(SWIG_OPTIONS -python;-py3)
+        set(CMAKE_SHARED_LIBRARY_PREFIX _lib)
+    else()
+        message(FATAL_ERROR "Implement a handler for ${BIND}")
+    endif()
+    add_custom_command(OUTPUT ${INTERFACE_NAME}_wrap.cxx
+        COMMAND ${SWIG}
+        ARGS -c++ ${SWIG_OPTIONS} -outcurrentdir ${CMAKE_CURRENT_SOURCE_DIR}/${INTERFACE_NAME}.i
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+    )
+    set(CLAIMTRIE_SRC ${CLAIMTRIE_SRC}
+        ${INTERFACE_NAME}_wrap.cxx
+    )
+endif()
+
 add_library(claimtrie SHARED ${CLAIMTRIE_SRC})
 
 target_include_directories(claimtrie PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 
-# TODO remove leveldb depends
+if(BIND_INCLUDE_DIRS)
-set(LEVELDB_SRC
+    target_include_directories(claimtrie PRIVATE ${BIND_INCLUDE_DIRS})
-    ../leveldb/db/builder.cc
-    ../leveldb/db/c.cc
-    ../leveldb/db/dbformat.cc
-    ../leveldb/db/db_impl.cc
-    ../leveldb/db/db_iter.cc
-    ../leveldb/db/dumpfile.cc
-    ../leveldb/db/filename.cc
-    ../leveldb/db/log_reader.cc
-    ../leveldb/db/log_writer.cc
-    ../leveldb/db/memtable.cc
-    ../leveldb/db/repair.cc
-    ../leveldb/db/table_cache.cc
-    ../leveldb/db/version_edit.cc
-    ../leveldb/db/version_set.cc
-    ../leveldb/db/write_batch.cc
-    ../leveldb/table/block_builder.cc
-    ../leveldb/table/block.cc
-    ../leveldb/table/filter_block.cc
-    ../leveldb/table/format.cc
-    ../leveldb/table/iterator.cc
-    ../leveldb/table/merger.cc
-    ../leveldb/table/table_builder.cc
-    ../leveldb/table/table.cc
-    ../leveldb/table/two_level_iterator.cc
-    ../leveldb/util/arena.cc
-    ../leveldb/util/bloom.cc
-    ../leveldb/util/cache.cc
-    ../leveldb/util/coding.cc
-    ../leveldb/util/comparator.cc
-    ../leveldb/util/crc32c.cc
-    ../leveldb/util/env.cc
-    ../leveldb/util/env_posix.cc
-    ../leveldb/util/filter_policy.cc
-    ../leveldb/util/hash.cc
-    ../leveldb/util/histogram.cc
-    ../leveldb/util/logging.cc
-    ../leveldb/util/options.cc
-    ../leveldb/util/status.cc
-)
-
-if(WIN32)
-    set(LEVELDB_SRC ${LEVELDB_SRC}
-        ../leveldb/util/env_win.cc
-        ../leveldb/port/port_win.cc
-    )
-else()
-    set(LEVELDB_SRC ${LEVELDB_SRC}
-        ../leveldb/port/port_posix.cc
-    )
 endif()
 
-add_library(leveldb STATIC ${LEVELDB_SRC})
-
-target_include_directories(leveldb PRIVATE ../leveldb ../leveldb/include)
-
-if(WIN32)
-    target_compile_definitions(leveldb PRIVATE -DLEVELDB_PLATFORM_WINDOWS -DWINVER=0x0500 -D__USE_MINGW_ANSI_STDIO=1)
-else()
-    target_compile_definitions(leveldb PRIVATE -DLEVELDB_PLATFORM_POSIX)
-endif()
-
-target_compile_definitions(leveldb PRIVATE -DLEVELDB_ATOMIC_PRESENT -D__STDC_LIMIT_MACROS)
-
-target_link_libraries(claimtrie PRIVATE leveldb)
-# leveldb depends end here
-
-# TODO remove BITCOIN depends
-target_include_directories(claimtrie PRIVATE ../ ../leveldb/include)
-# it's needed a configure call to create config files
-target_compile_definitions(claimtrie PRIVATE -DHAVE_CONFIG_H)
-# bitcoin depends end here
-
 CPMAddPackage(
     NAME OpenSSL
     GITHUB_REPOSITORY openssl/openssl

src/claimtrie/data.cpp

@@ -77,8 +77,3 @@ CNameOutPointHeightType::CNameOutPointHeightType(std::string name, CTxOutPoint o
     : name(std::move(name)), outPoint(std::move(outPoint)), nValidHeight(nValidHeight)
 {
 }
-
-CClaimIndexElement::CClaimIndexElement(std::string name, CClaimValue claim)
-    : name(std::move(name)), claim(std::move(claim))
-{
-}

src/claimtrie/data.h

@@ -2,7 +2,7 @@
 #ifndef CLAIMTRIE_DATA_H
 #define CLAIMTRIE_DATA_H
 
-#include <claimtrie/sqlite/sqlite3.h>
+#include <sqlite/sqlite3.h>
 #include <txoutpoint.h>
 #include <uints.h>
 
@@ -29,7 +29,7 @@ namespace sqlite
     }
 }
 
-#include <claimtrie/sqlite/hdr/sqlite_modern_cpp.h>
+#include <sqlite/hdr/sqlite_modern_cpp.h>
 
 namespace sqlite
 {
@@ -119,13 +119,4 @@ struct CNameOutPointHeightType
     CNameOutPointHeightType(std::string name, CTxOutPoint outPoint, int nValidHeight);
 };
 
-struct CClaimIndexElement
-{
-    std::string name;
-    CClaimValue claim;
-
-    CClaimIndexElement() = default;
-    CClaimIndexElement(std::string name, CClaimValue claim);
-};
-
 #endif // CLAIMTRIE_DATA_H

src/claimtrie/libclaimtrie.i

@@ -0,0 +1,57 @@
+
+%module libclaimtrie
+%{
+#include "uints.h"
+#include "txoutpoint.h"
+#include "data.h"
+#include "trie.h"
+#include "forks.h"
+%}
+
+%feature("directors", 1);
+%feature("flatnested", 1);
+
+%include stl.i
+%include stdint.i
+%include std_pair.i
+
+%ignore CBaseBlob(CBaseBlob &&);
+%ignore CClaimIndexElement(CClaimIndexElement &&);
+%ignore CClaimNsupports(CClaimNsupports &&);
+%ignore CClaimTrieProof(CClaimTrieProof &&);
+%ignore CClaimTrieProofNode(CClaimTrieProofNode &&);
+%ignore CClaimValue(CClaimValue &&);
+%ignore CSupportValue(CSupportValue &&);
+%ignore CTxOutPoint(CTxOutPoint &&);
+
+#define SWIG_INTERFACE
+
+%include "uints.h"
+%include "txoutpoint.h"
+%include "data.h"
+%include "trie.h"
+%include "forks.h"
+
+%template(CUint160) CBaseBlob<160>;
+%template(CUint256) CBaseBlob<256>;
+%template(uint8vec) std::vector<uint8_t>;
+
+%template(claimEntryType) std::vector<CClaimValue>;
+%template(supportEntryType) std::vector<CSupportValue>;
+%template(claimsNsupports) std::vector<CClaimNsupports>;
+
+%template(proofPair) std::pair<bool, CUint256>;
+%template(proofNodePair) std::pair<unsigned char, CUint256>;
+%template(claimUndoPair) std::pair<std::string, CClaimValue>;
+%template(supportUndoPair) std::pair<std::string, CSupportValue>;
+%template(takeoverUndoPair) std::pair<std::string, <std::pair<int, CUint160>>;
+
+%template(proofNodes) std::vector<CClaimTrieProofNode>;
+%template(proofPairs) std::vector<std::pair<bool, CUint256>>;
+%template(proofNodeChildren) std::vector<std::pair<unsigned char, CUint256>>;
+%template(claimUndoType) std::vector<claimUndoPair>;
+%template(supportUndoType) std::vector<supportUndoPair>;
+%template(insertUndoType) std::vector<CNameOutPointHeightType>;
+%template(takeoverUndoType) std::vector<takeoverUndoPair>;
+
+%rename(CClaimTrieCache) CClaimTrieCacheHashFork;

src/claimtrie/libclaimtrie_test.py

@@ -0,0 +1,86 @@
+
+from libclaimtrie import *
+import unittest
+
+class TestClaimTrieTypes(unittest.TestCase):
+    def setUp(self):
+        self.uint256s = "1234567890987654321012345678909876543210123456789098765432101234"
+        self.uint160 = CUint160S("1234567890987654321012345678909876543210")
+        self.uint = CUint256S(self.uint256s)
+        self.txp = CTxOutPoint(self.uint, 1)
+
+    def assertClaimEqual(self, claim, txo, cid, amount, effe, height, validHeight, msg):
+        self.assertEqual(claim.outPoint, txo, msg)
+        self.assertEqual(claim.claimId, cid, msg)
+        self.assertEqual(claim.nAmount, amount, msg)
+        self.assertEqual(claim.nEffectiveAmount, effe, msg)
+        self.assertEqual(claim.nHeight, height, msg)
+        self.assertEqual(claim.nValidAtHeight, validHeight, msg)
+
+    def assertSupportEqual(self, support, txo, cid, amount, height, validHeight, msg):
+        self.assertEqual(support.outPoint, txo, msg)
+        self.assertEqual(support.supportedClaimId, cid, msg)
+        self.assertEqual(support.nAmount, amount, msg)
+        self.assertEqual(support.nHeight, height, msg)
+        self.assertEqual(support.nValidAtHeight, validHeight, msg)
+
+    def test_uint256(self):
+        uint = self.uint
+        self.assertFalse(uint.IsNull(), "incorrect CUint256S or CBaseBlob::IsNull")
+        self.assertEqual(uint.GetHex(), self.uint256s, "incorrect CBaseBlob::GetHex")
+        self.assertEqual(uint.GetHex(), uint.ToString(), "incorrect CBaseBlob::ToString")
+        self.assertEqual(uint.size(), 32, "incorrect CBaseBlob::size")
+        copy = CUint256()
+        self.assertNotEqual(copy, uint, "incorrect CBaseBlob::operator!=")
+        self.assertTrue(copy.IsNull(), "incorrect CBaseBlob::IsNull")
+        copy = CUint256(uint)
+        self.assertEqual(copy, uint, "incorrect CBaseBlob::operator==")
+        copy.SetNull()
+        self.assertTrue(copy.IsNull()), "incorrect CBaseBlob::SetNull"
+
+    def test_txoupoint(self):
+        txp = self.txp
+        uint = self.uint
+        self.assertEqual(txp.hash, uint, "incorrect CTxOutPoint::CTxOutPoint")
+        self.assertEqual(txp.n, 1, "incorrect CTxOutPoint::CTxOutPoint")
+        self.assertFalse(txp.IsNull(), "incorrect CTxOutPoint::IsNull")
+        pcopy = CTxOutPoint()
+        self.assertTrue(pcopy.IsNull(), "incorrect CTxOutPoint::IsNull")
+        self.assertEqual(pcopy.hash, CUint256(), "incorrect CTxOutPoint::CTxOutPoint")
+        self.assertNotEqual(pcopy, txp, "incorrect CTxOutPoint::operator!=")
+        self.assertIn(uint.ToString()[:10], txp.ToString(), "incorrect CTxOutPoint::ToString")
+
+    def test_claim(self):
+        txp = self.txp
+        uint160 = self.uint160
+        self.assertEqual(uint160.size(), 20, "incorrect CBaseBlob::size")
+        claim = CClaimValue(txp, uint160, 20, 1, 10)
+        self.assertClaimEqual(claim, txp, uint160, 20, 20, 1, 10, "incorrect CClaimValue::CClaimValue")
+
+    def test_support(self):
+        txp = self.txp
+        uint160 = self.uint160
+        claim = CClaimValue(txp, uint160, 20, 1, 10)
+        support = CSupportValue(txp, uint160, 20, 1, 10)
+        self.assertSupportEqual(support, claim.outPoint, claim.claimId, claim.nAmount, claim.nHeight, claim.nValidAtHeight, "incorrect CSupportValue::CSupportValue")
+
+    def test_claimtrie(self):
+        txp = self.txp
+        uint160 = self.uint160
+        claim = CClaimValue(txp, uint160, 20, 1, 10)
+        data = CClaimTrieData()
+        data.insertClaim(claim)
+        wipe = True; height = 0; data_dir = "."
+        trie = CClaimTrie(wipe, height, data_dir)
+        cache = CClaimTrieCacheBase(trie)
+        self.assertTrue(cache.empty(), "incorrect CClaimtrieCache::empty")
+        self.assertFalse(cache.haveClaim("test", txp), "incorrect CClaimtrieCache::haveClaim")
+        self.assertTrue(cache.addClaim("tes", txp, uint160, 20, 0), "incorrect CClaimtrieCache::addClaim")
+        self.assertEqual(cache.getTotalNamesInTrie(), 1, "incorrect CClaimtrieCache::getTotalNamesInTrie")
+        self.assertEqual(cache.getTotalClaimsInTrie(), 1, "incorrect CClaimtrieCache::getTotalClaimsInTrie")
+        claimsToName = cache.getClaimsForName("test")
+        claims = claimsToName.claimsNsupports
+        self.assertEqual(claims.size(), 1, "incorrect CClaimTrieCache::getClaimsForName")
+        self.assertFalse(claims[0].IsNull(), "incorrect CClaimNsupports::IsNull")
+
+unittest.main()

src/claimtrie/trie.cpp

@@ -452,7 +452,7 @@ CUint256 CClaimTrieCacheBase::recursiveComputeMerkleHash(const std::string& name
     std::vector<std::tuple<std::string, std::unique_ptr<CUint256>, int>> children;
     childHashQuery << name >> [&children](std::string name, std::unique_ptr<CUint256> hash, int takeoverHeight) {
         children.push_back(std::make_tuple(std::move(name), std::move(hash), takeoverHeight));
-    }
+    };
     childHashQuery++;
 
     for (auto& child: children) {
@@ -460,7 +460,7 @@ CUint256 CClaimTrieCacheBase::recursiveComputeMerkleHash(const std::string& name
         auto& hash = std::get<1>(child);
         if (!hash) hash = std::make_unique<CUint256>();
         if (hash->IsNull())
-            hash = recursiveComputeMerkleHash(name, std::get<2>(child), checkOnly);
+            *hash = recursiveComputeMerkleHash(name, std::get<2>(child), checkOnly);
         completeHash(*hash, name, pos);
         vchToHash.push_back(name[pos]);
         vchToHash.insert(vchToHash.end(), hash->begin(), hash->end());

src/claimtrie/trie.h

@@ -55,17 +55,18 @@ class CClaimTrie
     friend class CClaimTrieCacheHashFork;
     friend class CClaimTrieCacheExpirationFork;
     friend class CClaimTrieCacheNormalizationFork;
+
 public:
     CClaimTrie() = default;
     CClaimTrie(CClaimTrie&&) = delete;
     CClaimTrie(const CClaimTrie&) = delete;
     CClaimTrie(bool fWipe, int height,
                const std::string& dataDir,
-               int nNormalizedNameForkHeight,
+               int nNormalizedNameForkHeight = -1,
-               int64_t nOriginalClaimExpirationTime,
+               int64_t nOriginalClaimExpirationTime = -1,
-               int64_t nExtendedClaimExpirationTime,
+               int64_t nExtendedClaimExpirationTime = -1,
-               int64_t nExtendedClaimExpirationForkHeight,
+               int64_t nExtendedClaimExpirationForkHeight = -1,
-               int64_t nAllClaimsInMerkleForkHeight,
+               int64_t nAllClaimsInMerkleForkHeight = -1,
                int proportionalDelayFactor = 32);
 
     CClaimTrie& operator=(CClaimTrie&&) = delete;
@@ -77,7 +78,7 @@ public:
 protected:
     int nNextHeight = 0;
     sqlite::database db;
-    const int nProportionalDelayFactor = 0;
+    const int nProportionalDelayFactor = 1;
 
     const int nNormalizedNameForkHeight = -1;
     const int64_t nOriginalClaimExpirationTime = -1;
@@ -90,6 +91,7 @@ struct CClaimTrieProofNode
 {
     CClaimTrieProofNode(std::vector<std::pair<unsigned char, CUint256>> children, bool hasValue, CUint256 valHash);
 
+    CClaimTrieProofNode() = default;
     CClaimTrieProofNode(CClaimTrieProofNode&&) = default;
     CClaimTrieProofNode(const CClaimTrieProofNode&) = default;
     CClaimTrieProofNode& operator=(CClaimTrieProofNode&&) = default;
@@ -118,10 +120,20 @@ struct CClaimTrieProof
 template <typename T>
 using queueEntryType = std::pair<std::string, T>;
 
-typedef std::vector<queueEntryType<CClaimValue>> claimUndoType;
+#ifdef SWIG_INTERFACE // swig has a problem with using in typedef
-typedef std::vector<queueEntryType<CSupportValue>> supportUndoType;
+using claimUndoPair = std::pair<std::string, CClaimValue>;
+using supportUndoPair = std::pair<std::string, CSupportValue>;
+using takeoverUndoPair = std::pair<std::string, <std::pair<int, CUint160>>;
+#else
+using claimUndoPair = queueEntryType<CClaimValue>;
+using supportUndoPair = queueEntryType<CSupportValue>;
+using takeoverUndoPair = queueEntryType<std::pair<int, CUint160>>;
+#endif
+
+typedef std::vector<claimUndoPair> claimUndoType;
+typedef std::vector<supportUndoPair> supportUndoType;
 typedef std::vector<CNameOutPointHeightType> insertUndoType;
-typedef std::vector<queueEntryType<std::pair<int, CUint160>>> takeoverUndoType;
+typedef std::vector<takeoverUndoPair> takeoverUndoType;
 
 class CClaimTrieCacheBase
 {

src/claimtrie/txoutpoint.h

@@ -5,6 +5,7 @@
 #include <uints.h>
 
 #include <algorithm>
+#include <string>
 #include <type_traits>
 #include <vector>
 #include <utility>
@@ -34,4 +35,8 @@ public:
     std::string ToString() const;
 };
 
+#ifndef SWIG_INTERFACE
+
+
+#endif // SWIG_INTERFACE
 #endif // CLAIMTRIE_TXOUTPUT_H

src/claimtrie_serial.h

@@ -88,18 +88,4 @@ void Unserialize(Stream& s, CNameOutPointHeightType& u)
     Unserialize(s, u.nValidHeight);
 }
 
-template<typename Stream>
-void Serialize(Stream& s, const CClaimIndexElement& u)
-{
-    Serialize(s, u.name);
-    Serialize(s, u.claim);
-}
-
-template<typename Stream>
-void Unserialize(Stream& s, CClaimIndexElement& u)
-{
-    Unserialize(s, u.name);
-    Unserialize(s, u.claim);
-}
-
 #endif // CLAIMTRIE_SERIAL_H

src/init.cpp

@@ -1586,7 +1586,7 @@ bool AppInitMain(InitInterfaces& interfaces)
             }
                 auto tip = chainActive.Tip();
                 assert(tip);
-                if (!CClaimTrieCache(pclaimTrie).validateDb(tip->hashClaimTrie))
+                if (!CClaimTrieCache(pclaimTrie).validateDb(tip->hashClaimTrie)) {
                     strLoadError = _("Error loading the claim trie from disk");
                     break;
                 }

src/test/claimtriebranching_tests.cpp

@@ -440,15 +440,15 @@ BOOST_AUTO_TEST_CASE(claimtrie_update_takeover_test)
     fixture.getLastTakeoverForName("test", cid2, takeover);
     CClaimValue value;
     BOOST_REQUIRE(fixture.getInfoForName("test", value) && value.nAmount == 3);
-    BOOST_CHECK_EQUAL(cid, cid2);
+    BOOST_CHECK_EQUAL(cid, uint160(cid2));
     BOOST_CHECK_EQUAL(height, takeover);
     fixture.DecrementBlocks(1);
     fixture.getLastTakeoverForName("test", cid2, takeover);
-    BOOST_CHECK_EQUAL(cid, cid2);
+    BOOST_CHECK_EQUAL(cid, uint160(cid2));
     BOOST_CHECK_EQUAL(height, takeover);
     fixture.DecrementBlocks(1);
     fixture.getLastTakeoverForName("test", cid2, takeover);
-    BOOST_CHECK_EQUAL(cid, cid2);
+    BOOST_CHECK_EQUAL(cid, uint160(cid2));
     BOOST_CHECK_EQUAL(height, takeover);
 }
 
@@ -1924,7 +1924,7 @@ BOOST_AUTO_TEST_CASE(update_on_support2_test)
     int lastTakeover;
     BOOST_CHECK(fixture.getLastTakeoverForName(name, claimId, lastTakeover));
     BOOST_CHECK_EQUAL(lastTakeover, height + 1);
-    BOOST_CHECK_EQUAL(ClaimIdHash(tx1.GetHash(), 0), claimId);
+    BOOST_CHECK_EQUAL(ClaimIdHash(tx1.GetHash(), 0), uint160(claimId));
 
     fixture.Spend(s1);
     fixture.Spend(s2);

src/test/claimtrieexpirationfork_tests.cpp

@@ -276,9 +276,6 @@ BOOST_AUTO_TEST_CASE(hardfork_disk_test)
     BOOST_CHECK_EQUAL(fixture.expirationTime(), 3);
     fixture.IncrementBlocks(7, true);
     BOOST_CHECK_EQUAL(fixture.expirationTime(), 6);
-    auto tip = chainActive.Tip();
-    pclaimTrie->ReadFromDisk(tip->nHeight, tip->hashClaimTrie);
-    BOOST_CHECK_EQUAL(fixture.expirationTime(), 6);
 
     // Create a claim and support 1 block before the fork height that will expire after the fork height.
     // Reset to disk, increment past the fork height and make sure we get
@@ -288,8 +285,6 @@ BOOST_AUTO_TEST_CASE(hardfork_disk_test)
     CMutableTransaction s1 = fixture.MakeSupport(fixture.GetCoinbase(), tx1, "test", 1);
     fixture.IncrementBlocks(1);
 
-    tip = chainActive.Tip();
-    pclaimTrie->ReadFromDisk(tip->nHeight, tip->hashClaimTrie);
     BOOST_CHECK_EQUAL(fixture.expirationTime(), 3);
     fixture.IncrementBlocks(1);
     BOOST_CHECK_EQUAL(fixture.expirationTime(), 6);
@@ -310,8 +305,7 @@ BOOST_AUTO_TEST_CASE(hardfork_disk_test)
     CMutableTransaction tx2 = fixture.MakeClaim(fixture.GetCoinbase(),"test2","one",1);
     CMutableTransaction s2 = fixture.MakeSupport(fixture.GetCoinbase(),tx2,"test2",1);
     fixture.IncrementBlocks(1);
-    tip = chainActive.Tip();
+
-    pclaimTrie->ReadFromDisk(tip->nHeight, tip->hashClaimTrie);
     CMutableTransaction u2 = fixture.MakeUpdate(tx2, "test2", "two", ClaimIdHash(tx2.GetHash(), 0), 1);
     // increment to fork
     fixture.IncrementBlocks(2);

src/test/claimtriefixture.h

@@ -28,6 +28,8 @@
 
 extern ::CChainState g_chainstate;
 extern ::ArgsManager gArgs;
+extern std::vector<std::string> random_strings(std::size_t count);
+
 
 CMutableTransaction BuildTransaction(const uint256& prevhash);
 CMutableTransaction BuildTransaction(const CTransaction& prev, uint32_t prevout=0, unsigned int numOutputs=1, int locktime=0);