CMakeLists.txt

if(BUILD_KAFKA_PLUGIN)
  file(GLOB HEADERS "include/eosio/kafka_plugin/*.hpp")
  include_directories("/usr/local/include/librdkafka")

  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-static REQUIRED)
    message(STATUS "Found bsoncxx headers: ${LIBBSONCXX_STATIC_INCLUDE_DIRS}")

    # mongo-cxx-driver 3.2 release altered LIBBSONCXX_LIBRARIES semantics. Instead of library names,
    #  it now hold library paths.
    if((LIBBSONCXX_STATIC_VERSION_MAJOR LESS 3) OR ((LIBBSONCXX_STATIC_VERSION_MAJOR EQUAL 3) AND (LIBBSONCXX_STATIC_VERSION_MINOR LESS 2)))
      find_library(EOS_LIBBSONCXX ${LIBBSONCXX_STATIC_LIBRARIES}
              PATHS ${LIBBSONCXX_STATIC_LIBRARY_DIRS} NO_DEFAULT_PATH)
    else()
      set(EOS_LIBBSONCXX ${LIBBSONCXX_STATIC_LIBRARIES})
    endif()

    message(STATUS "Found bsoncxx library: ${EOS_LIBBSONCXX}")

    find_package(libmongocxx-static REQUIRED)
    message(STATUS "Found mongocxx headers: ${LIBMONGOCXX_STATIC_INCLUDE_DIRS}")

    # mongo-cxx-driver 3.2 release altered LIBBSONCXX_LIBRARIES semantics. Instead of library names,
    #  it now hold library paths.
    if((LIBMONGOCXX_STATIC_VERSION_MAJOR LESS 3) OR ((LIBMONGOCXX_STATIC_VERSION_MAJOR EQUAL 3) AND (LIBMONGOCXX_STATIC_VERSION_MINOR LESS 2)))
      find_library(EOS_LIBMONGOCXX ${LIBMONGOCXX_STATIC_LIBRARIES}
              PATHS ${LIBMONGOCXX_STATIC_LIBRARY_DIRS} NO_DEFAULT_PATH)
    else()
      set(EOS_LIBMONGOCXX ${LIBMONGOCXX_STATIC_LIBRARIES})
    endif()

    message(STATUS "Found mongocxx library: ${EOS_LIBMONGOCXX}")
  else()
    message("Could NOT find MongoDB. kafka_plugin with MongoDB support will not be included.")
    return()
  endif()

  link_libraries("/usr/local/lib/librdkafka.so" "/usr/local/lib/librdkafka.so.1")
#  link_libraries("/usr/local/lib/librdkafka.dylib" "/usr/local/lib/librdkafka.1.dylib")  # macos
  link_directories("/usr/local/lib")
  add_library( kafka_plugin
               kafka_plugin.cpp kafka_producer.cpp
               ${HEADERS} )
  target_include_directories(kafka_plugin
          PRIVATE ${LIBMONGOCXX_STATIC_INCLUDE_DIRS} ${LIBBSONCXX_STATIC_INCLUDE_DIRS}
          PUBLIC "include"
          )
  target_link_libraries(kafka_plugin
          PUBLIC chain_plugin eosio_chain appbase fc
          )

else()
  message("kafka_plugin not selected and will be omitted.")
endif()