Add ability to build without mongodb #172

plugins/db_plugin/CMakeLists.txt

@@ -3,36 +3,38 @@ add_library( db_plugin
              db_plugin.cpp
              ${HEADERS} )
 
-find_package(libmongoc-1.0 1.8 REQUIRED)
+find_package(libmongoc-1.0 1.8)
 
-message ("--   mongoc found version \"${MONGOC_VERSION}\"")
-message ("--   mongoc include path \"${MONGOC_INCLUDE_DIRS}\"")
-message ("--   mongoc libraries \"${MONGOC_LIBRARIES}\"")
+if (libmongoc-1.0_FOUND)
 
-find_package(PkgConfig QUIET)
+    message("--   mongoc found version \"${MONGOC_VERSION}\"")
+    message("--   mongoc include path \"${MONGOC_INCLUDE_DIRS}\"")
+    message("--   mongoc libraries \"${MONGOC_LIBRARIES}\"")
 
-# NOTE: For this to work, the PKG_CONFIG_PATH variable (man pkg-config) must be set to point to the
-# 'lib/pkgconfig' subdirectory of the directory used as the argument to CMAKE_INSTALL_PREFIX when
-# building libmongocxx and libbsoncxx.
-pkg_search_module(BSONCXX REQUIRED libbsoncxx)
-pkg_search_module(MONGOCXX REQUIRED libmongocxx)
+    find_package(PkgConfig QUIET)
 
-link_directories(
-  ${MONGOCXX_LIBRARY_DIRS}
-  ${BSONCXX_LIBRARY_DIRS}
-)
+    # NOTE: For this to work, the PKG_CONFIG_PATH variable (man pkg-config) must be set to point to the
+    # 'lib/pkgconfig' subdirectory of the directory used as the argument to CMAKE_INSTALL_PREFIX when
+    # building libmongocxx and libbsoncxx.
+    pkg_search_module(BSONCXX REQUIRED libbsoncxx)
+    pkg_search_module(MONGOCXX REQUIRED libmongocxx)
+
+    link_directories(
+            ${MONGOCXX_LIBRARY_DIRS}
+            ${BSONCXX_LIBRARY_DIRS}
+    )
+    add_definitions(-DMONGODB)
+endif()
 
-target_include_directories( db_plugin
+target_include_directories(db_plugin
         PRIVATE ${MONGOCXX_INCLUDE_DIRS}
         PRIVATE ${BSONCXX_INCLUDE_DIRS}
         PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include"
-)
-target_link_libraries( db_plugin
+        )
+target_link_libraries(db_plugin
         PUBLIC chain_plugin eos_chain appbase
         PRIVATE ${MONGOCXX_LIBRARIES} ${BSONCXX_LIBRARIES}
-)
-
-
+        )
 
 install( TARGETS
    db_plugin

plugins/db_plugin/db_plugin.cpp

@@ -11,6 +11,7 @@
 #include <boost/thread/thread.hpp>
 #include <boost/lockfree/spsc_queue.hpp>
 
+#ifdef MONGODB
 #include <bsoncxx/builder/basic/kvp.hpp>
 #include <bsoncxx/builder/basic/document.hpp>
 #include <bsoncxx/builder/stream/document.hpp>
@@ -18,6 +19,7 @@
 
 #include <mongocxx/client.hpp>
 #include <mongocxx/instance.hpp>
+#endif
 
 namespace fc { class variant; }
 
@@ -31,6 +33,14 @@ using chain::ProcessedTransaction;
 using chain::signed_block;
 using chain::transaction_id_type;
 
+#ifndef MONGODB
+class db_plugin_impl {
+public:
+   db_plugin_impl() {}
+};
+#endif
+
+#ifdef MONGODB
 class db_plugin_impl {
 public:
    db_plugin_impl();
@@ -523,6 +533,7 @@ void db_plugin_impl::init() {
    }
 }
 
+#endif /* MONGODB */
 ////////////
 // db_plugin
 ////////////
@@ -538,6 +549,7 @@ db_plugin::~db_plugin()
 
 void db_plugin::set_program_options(options_description& cli, options_description& cfg)
 {
+#ifdef MONGODB
    cfg.add_options()
          ("filter-on-accounts,f", bpo::value<std::vector<std::string>>()->composing(),
           "Track only transactions whose scopes involve the listed accounts. Default is to track all transactions.")
@@ -546,23 +558,29 @@ void db_plugin::set_program_options(options_description& cli, options_descriptio
          ("mongodb-uri,m", bpo::value<std::string>()->default_value("mongodb://localhost:27017"),
          "MongoDB URI connection string, see: https://docs.mongodb.com/master/reference/connection-string/")
          ;
+#endif
 }
 
 void db_plugin::wipe_database() {
+#ifdef MONGODB
    if (!my->startup) {
       elog("ERROR: db_plugin::wipe_database() called before configuration or after startup. Ignoring.");
    } else {
       my->wipe_database_on_startup = true;
    }
+#endif
 }
 
 void db_plugin::applied_irreversible_block(const signed_block& block) {
+#ifdef MONGODB
    my->applied_irreversible_block(block);
+#endif
 }
 
 
 void db_plugin::plugin_initialize(const variables_map& options)
 {
+#ifdef MONGODB
    ilog("initializing db plugin");
    if(options.count("filter-on-accounts")) {
       auto foa = options.at("filter-on-accounts").as<std::vector<std::string>>();
@@ -582,17 +600,19 @@ void db_plugin::plugin_initialize(const variables_map& options)
       my->wipe_database();
    }
    my->init();
+#endif
 }
 
 void db_plugin::plugin_startup()
 {
+#ifdef MONGODB
    ilog("starting db plugin");
-   // TODO: assert that last irreversible in db is one less than received (on startup only?, every so often?)
 
    my->consum_thread = boost::thread([this]{ my->consum_blocks(); });
 
    // chain_controller is created and has resynced or replayed if needed
    my->startup = false;
+#endif
 }
 
 void db_plugin::plugin_shutdown()