Implement chain governance via SystemContract

src/bins/faucet-api/src/httpserver.cpp

@@ -20,12 +20,12 @@ namespace Faucet {
     std::vector<std::thread> v;
     v.reserve(4 - 1);
     for (int i = 4 - 1; i > 0; i--) v.emplace_back([&]{ this->ioc_.run(); });
-    LOGINFO(std::string("HTTP Server Started at port: ") + std::to_string(port_));
+    LOGTRACE(std::string("HTTP server started at port: ") + std::to_string(port_));
     this->ioc_.run();
 
     // If we get here, it means we got a SIGINT or SIGTERM. Block until all the threads exit
     for (std::thread& t : v) t.join();
-    LOGINFO("HTTP Server Stopped");
+    LOGTRACE("HTTP server stopped");
     return true;
   }
 

src/contract/CMakeLists.txt

@@ -36,6 +36,7 @@ set(CONTRACT_HEADERS
   ${CMAKE_SOURCE_DIR}/src/contract/templates/dexv2/dexv2router02.h
   ${CMAKE_SOURCE_DIR}/src/contract/templates/dexv2/uq112x112.h
   ${CMAKE_SOURCE_DIR}/src/contract/templates/pebble.h
+  ${CMAKE_SOURCE_DIR}/src/contract/templates/systemcontract.h
   ${CMAKE_SOURCE_DIR}/src/contract/templates/throwtestA.h
   ${CMAKE_SOURCE_DIR}/src/contract/templates/throwtestB.h
   ${CMAKE_SOURCE_DIR}/src/contract/templates/throwtestC.h
@@ -74,6 +75,7 @@ set(CONTRACT_SOURCES
   ${CMAKE_SOURCE_DIR}/src/contract/templates/dexv2/dexv2pair.cpp
   ${CMAKE_SOURCE_DIR}/src/contract/templates/dexv2/dexv2router02.cpp
   ${CMAKE_SOURCE_DIR}/src/contract/templates/pebble.cpp
+  ${CMAKE_SOURCE_DIR}/src/contract/templates/systemcontract.cpp
   ${CMAKE_SOURCE_DIR}/src/contract/templates/throwtestA.cpp
   ${CMAKE_SOURCE_DIR}/src/contract/templates/throwtestB.cpp
   ${CMAKE_SOURCE_DIR}/src/contract/templates/throwtestC.cpp

src/contract/customcontracts.h

@@ -5,6 +5,9 @@ This software is distributed under the MIT License.
 See the LICENSE.txt file in the project root for more information.
 */
 
+#ifndef CUSTOMCONTRACTS_H
+#define CUSTOMCONTRACTS_H
+
 #include "templates/erc20.h"
 #include "templates/erc20wrapper.h"
 #include "templates/nativewrapper.h"
@@ -23,12 +26,14 @@ See the LICENSE.txt file in the project root for more information.
 #include "templates/snailtraceroptimized.h"
 #include "templates/ownable.h"
 #include "templates/pebble.h"
+#include "templates/systemcontract.h"
 
 /// Typedef for the blockchain's registered contracts.
 #ifdef BUILD_TESTNET
 /// Typedef for the blockchain's registered contracts in TESTNET mode.
 using ContractTypes = std::tuple<
-  ERC20, NativeWrapper, DEXV2Pair, DEXV2Factory, DEXV2Router02, ERC721, ERC721URIStorage, Ownable, Pebble
+  ERC20, NativeWrapper, DEXV2Pair, DEXV2Factory, DEXV2Router02, ERC721, ERC721URIStorage,
+  Ownable, Pebble
 >;
 #else
 /// Typedef for the blockchain's registered contracts in normal mode.
@@ -39,3 +44,17 @@ using ContractTypes = std::tuple<
 >;
 #endif
 
+/// Typedef for all protocol contracts that have state to persist.
+using StatefulProtocolContractTypes = std::tuple<
+  SystemContract
+>;
+
+/// Typedef for all contracts (protocol or not) with state to persist.
+using PersistedContractTypes = decltype(
+  std::tuple_cat(
+    std::declval<ContractTypes>(),
+    std::declval<StatefulProtocolContractTypes>()
+  )
+);
+
+#endif // CUSTOMCONTRACTS_H

src/contract/executioncontext.cpp

@@ -87,7 +87,7 @@ void ExecutionContext::transferBalance(View<Address> fromAddress, View<Address>
   auto recipient = getAccount(toAddress);
 
   if (sender.getBalance() < amount) {
-    throw DynamicException("insufficient founds");
+    throw DynamicException("ExecutionContext::transferBalance(): insufficient funds");
   }
 
   sender.setBalance(sender.getBalance() - amount);