issue 101: support dynamic config (#105)

Author: yamingk

conanfile.py

@@ -9,7 +9,7 @@
 
 class HomeBlocksConan(ConanFile):
     name = "homeblocks"
-    version = "1.0.21"
+    version = "1.0.22"
     homepage = "https://github.com/eBay/HomeBlocks"
     description = "Block Store built on HomeStore"
     topics = ("ebay")

src/lib/CMakeLists.txt

@@ -2,6 +2,13 @@ cmake_minimum_required (VERSION 3.11)
 
 add_flags("-Wno-unused-parameter")
 
+list(GET sisl_INCLUDE_DIRS 0 SISL_TOP_INCLUDE)
+include ("${SISL_TOP_INCLUDE}/../cmake/settings_gen.cmake")
+
+if(NOT ${CMAKE_CURRENT_BINARY_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
+  include_directories(BEFORE ${CMAKE_CURRENT_BINARY_DIR})
+endif()
+
 add_library(${PROJECT_NAME}_core OBJECT)
 target_sources(${PROJECT_NAME}_core PRIVATE
     homeblks_impl.cpp
@@ -13,6 +20,14 @@ target_link_libraries(${PROJECT_NAME}_core
     ${COMMON_DEPS}
 )
 
+set(FLATBUFFERS_FLATC_EXECUTABLE ${flatbuffers_INCLUDE_DIRS}/../bin/flatc)
+settings_gen_cpp(
+    ${FLATBUFFERS_FLATC_EXECUTABLE}
+    ${CMAKE_CURRENT_BINARY_DIR}/generated/
+    "${PROJECT_NAME}_core"
+	home_blks_config.fbs
+  )
+
 #add_subdirectory(homestore_backend)
 #add_subdirectory(memory_backend)
 add_subdirectory(volume)

src/lib/home_blks_config.fbs

@@ -0,0 +1,14 @@
+native_include "sisl/utility/non_null_ptr.hpp";
+
+namespace homeblkscfg;
+
+attribute "hotswap";
+attribute "deprecated";
+
+
+table HomeBlksSettings{
+    // reaper thread timer in seconds
+    reaper_thread_timer_secs: uint64 = 120;
+}
+
+root_type HomeBlksSettings;

src/lib/home_blks_config.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <sisl/settings/settings.hpp>
+#include "generated/home_blks_config_generated.h"
+
+SETTINGS_INIT(homeblkscfg::HomeBlksSettings, home_blks_config);
+
+namespace homeblocks {
+#define HB_DYNAMIC_CONFIG_WITH(...) SETTINGS(home_blks_config, __VA_ARGS__)
+#define HB_DYNAMIC_CONFIG_THIS(...) SETTINGS_THIS(home_blks_config, __VA_ARGS__)
+#define HB_DYNAMIC_CONFIG(...) SETTINGS_VALUE(home_blks_config, __VA_ARGS__)
+
+#define HB_SETTINGS_FACTORY() SETTINGS_FACTORY(home_blks_config)
+
+} // namespace homeblocks

src/lib/homeblks_impl.cpp

@@ -22,6 +22,7 @@
 #include <sisl/options/options.h>
 #include "homeblks_impl.hpp"
 #include "listener.hpp"
+#include "home_blks_config.hpp"
 
 SISL_OPTION_GROUP(homeblocks,
                   (executor_type, "", "executor", "Executor to use for Future deferal",
@@ -32,7 +33,7 @@ SISL_LOGGING_DEF(HOMEBLOCKS_LOG_MODS)
 namespace homeblocks {
 
 extern std::shared_ptr< HomeBlocks > init_homeblocks(std::weak_ptr< HomeBlocksApplication >&& application) {
-    LOGI("Initializing HomeBlocks");
+    LOGI("Initializing HomeBlocks with reaper thread timer: {} seconds", HB_DYNAMIC_CONFIG(reaper_thread_timer_secs));
     auto inst = std::make_shared< HomeBlocksImpl >(std::move(application));
     inst->init_homestore();
     inst->init_cp();