Pulled mongo db_plugin over.

Quick mods to make it compile. #1047

plugins/CMakeLists.txt

@@ -9,5 +9,6 @@ add_subdirectory(account_history_plugin)
 add_subdirectory(account_history_api_plugin)
 add_subdirectory(wallet_plugin)
 add_subdirectory(wallet_api_plugin)
+add_subdirectory(mongo_db_plugin)
 add_subdirectory(txn_test_gen_plugin)
 add_subdirectory(faucet_testnet_plugin)

plugins/mongo_db_plugin/CMakeLists.txt

+file(GLOB HEADERS "include/eos/db_plugin/*.hpp")
+add_library( db_plugin
+             db_plugin.cpp
+             ${HEADERS} )
+
+find_package(libmongoc-1.0 1.8)
+
+if (libmongoc-1.0_FOUND)
+
+    # EOS has no direct dependencies on libmongoc but its shared libraries
+    # will need to be present at runtime for the C++ libraries we use:
+    # libbsoncxx & libmongocxx (both from github.com/mongodb/mongo-cxx-driver)
+
+    # The *.cmake package files provided by mongo-cxx-driver don't give us the
+    # absolute path to the libraries, which is needed whenever they are not
+    # installed in system-known locations.  CMake requires the absolute paths
+    # in target_link_libraries() since we are builiding an archive and the
+    # link step for all executables using this archive must include the
+    # mongo-cxx-driver libraries libmongocxx and libbsoncxx.
+
+    find_package(libbsoncxx REQUIRED)
+    message(STATUS "Found bsoncxx headers: ${LIBBSONCXX_INCLUDE_DIRS}")
+    find_library(EOS_LIBBSONCXX ${LIBBSONCXX_LIBRARIES}
+                 PATHS ${LIBBSONCXX_LIBRARY_DIRS} NO_DEFAULT_PATH)
+    message(STATUS "Found bsoncxx library: ${EOS_LIBBSONCXX}")
+
+    find_package(libmongocxx REQUIRED)
+    message(STATUS "Found mongocxx headers: ${LIBMONGOCXX_INCLUDE_DIRS}")
+    find_library(EOS_LIBMONGOCXX ${LIBMONGOCXX_LIBRARIES}
+                 PATHS ${LIBMONGOCXX_LIBRARY_DIRS} NO_DEFAULT_PATH)
+    message(STATUS "Found mongocxx library: ${EOS_LIBMONGOCXX}")
+
+    add_definitions(-DMONGODB)
+else()
+    message("Could NOT find MongoDB. db_plugin with MongoDB support will not be included.")
+    # sudo apt-get install pkg-config libssl-dev libsasl2-dev
+    # wget https://github.com/mongodb/mongo-c-driver/releases/download/1.8.0/mongo-c-driver-1.8.0.tar.gz
+    # tar xzf mongo-c-driver-1.8.0.tar.gz
+    # cd mongo-c-driver-1.8.0
+    # ./configure --disable-automatic-init-and-cleanup --enable-static
+    # make
+    # sudo make install
+    #
+    # git clone https://github.com/mongodb/mongo-cxx-driver.git --branch releases/stable --depth 1
+    # cd mongo-cxx-driver/build
+    # cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
+    # sudo make EP_mnmlstc_core
+    # make
+    # sudo make install
+    #
+    # sudo apt-get install mongodb
+endif()
+
+target_include_directories(db_plugin
+        PRIVATE ${LIBMONGOCXX_INCLUDE_DIRS} ${LIBBSONCXX_INCLUDE_DIRS}
+        PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include"
+        )
+
+target_compile_definitions(db_plugin
+	PRIVATE ${LIBMONGOCXX_DEFINITIONS} ${LIBBSONCXX_DEFINITIONS}
+	)
+
+target_link_libraries(db_plugin
+        PUBLIC chain_plugin eos_chain appbase
+        ${EOS_LIBMONGOCXX} ${EOS_LIBBSONCXX}
+        )
+
+install( TARGETS
+   db_plugin
+
+   RUNTIME DESTINATION bin
+   LIBRARY DESTINATION lib
+   ARCHIVE DESTINATION lib
+)
+install( FILES ${HEADERS} DESTINATION "include/eos/db_plugin" )

plugins/mongo_db_plugin/include/eosio/db_plugin/db_plugin.hpp

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
+#pragma once
+
+#include <eosio/chain_plugin/chain_plugin.hpp>
+#include <appbase/application.hpp>
+#include <memory>
+
+namespace eosio {
+
+using db_plugin_impl_ptr = std::shared_ptr<class db_plugin_impl>;
+
+/**
+ * Provides persistence to MongoDB for:
+ *   Blocks
+ *   Transactions
+ *   Messages
+ *   Accounts
+ *
+ *   See data dictionary (DB Schema Definition - EOS API) for description of MongoDB schema.
+ *
+ *   The goal ultimately is for all chainbase data to be mirrored in MongoDB via a delayed node processing
+ *   irreversible blocks. Currently, only Blocks, Transactions, Messages, and Account balance it mirrored.
+ *   Chainbase is being rewritten to be multi-threaded. Once chainbase is stable, integration directly with
+ *   a mirror database approach can be followed removing the need for the direct processing of Blocks employed
+ *   with this implementation.
+ *
+ *   If MongoDB env not available (#ifndef MONGODB) this plugin is a no-op.
+ */
+class db_plugin : public plugin<db_plugin> {
+public:
+   APPBASE_PLUGIN_REQUIRES((chain_plugin))
+
+   db_plugin();
+   virtual ~db_plugin();
+
+   virtual void set_program_options(options_description& cli, options_description& cfg) override;
+
+   // This may only be called after plugin_initialize() and before plugin_startup()!
+   void wipe_database();
+   void applied_irreversible_block(const chain::signed_block& block);
+
+   void plugin_initialize(const variables_map& options);
+   void plugin_startup();
+   void plugin_shutdown();
+
+private:
+   db_plugin_impl_ptr my;
+};
+
+}
+