plugins: add ZeroBus output plugin

CMakeLists.txt

@@ -1369,6 +1369,12 @@ if(FLB_OUT_PGSQL AND (NOT PostgreSQL_FOUND))
    FLB_OPTION(FLB_OUT_PGSQL OFF)
 endif()
 
+# Zerobus FFI
+# ===========
+if(FLB_OUT_ZEROBUS)
+  include(cmake/zerobus-ffi.cmake)
+endif()
+
 # Arrow GLib
 # ==========
 find_package(PkgConfig)

cmake/plugins_options.cmake

@@ -155,3 +155,4 @@ DEFINE_OPTION(FLB_OUT_TCP                     "Enable TCP output plugin"
 DEFINE_OPTION(FLB_OUT_UDP                     "Enable UDP output plugin"                     ON)
 DEFINE_OPTION(FLB_OUT_VIVO_EXPORTER           "Enable Vivo exporter output plugin"           ON)
 DEFINE_OPTION(FLB_OUT_WEBSOCKET               "Enable Websocket output plugin"               ON)
+DEFINE_OPTION(FLB_OUT_ZEROBUS                 "Enable Databricks Zerobus output plugin"      OFF)

cmake/zerobus-ffi.cmake

@@ -0,0 +1,36 @@
+# Locate the pre-installed Zerobus FFI static library.
+#
+# The out_zerobus plugin requires the Zerobus FFI library to be installed
+# on the build system before configuring.  Fluent Bit does not download
+# third-party dependencies at configure/build time.
+#
+# If the plugin is enabled and the library is not found, configuration fails.
+#
+# Use -DZEROBUS_LIB_DIR=/path/to/dir to point to a custom location.
+#
+# After this module runs successfully:
+#   ZEROBUS_LIB_FILE — full path to the static library
+
+set(_ZEROBUS_LIB_NAME "zerobus_ffi")
+
+if(ZEROBUS_LIB_DIR)
+  # User provided an explicit directory — search only there.
+  find_library(ZEROBUS_LIB_FILE
+    NAMES ${_ZEROBUS_LIB_NAME}
+    PATHS "${ZEROBUS_LIB_DIR}"
+    NO_DEFAULT_PATH
+    NO_CMAKE_FIND_ROOT_PATH
+  )
+else()
+  # Search standard system paths.
+  find_library(ZEROBUS_LIB_FILE NAMES ${_ZEROBUS_LIB_NAME})
+endif()
+
+if(ZEROBUS_LIB_FILE)
+  message(STATUS "Zerobus FFI library: ${ZEROBUS_LIB_FILE}")
+else()
+  message(FATAL_ERROR
+    "Zerobus FFI library not found. Install libzerobus_ffi or set "
+    "-DZEROBUS_LIB_DIR=/path/to/lib, or disable the plugin with "
+    "-DFLB_OUT_ZEROBUS=OFF.")
+endif()

plugins/CMakeLists.txt

@@ -413,6 +413,7 @@ REGISTER_OUT_PLUGIN("out_prometheus_remote_write")
 REGISTER_OUT_PLUGIN("out_s3")
 REGISTER_OUT_PLUGIN("out_vivo_exporter")
 REGISTER_OUT_PLUGIN("out_chronicle")
+REGISTER_OUT_PLUGIN("out_zerobus")
 
 if(FLB_ZIG)
 REGISTER_OUT_PLUGIN("out_zig_demo" "zig")

plugins/out_zerobus/CMakeLists.txt

@@ -0,0 +1,19 @@
+set(src
+  zerobus.c)
+
+FLB_PLUGIN(out_zerobus "${src}" "")
+target_link_libraries(flb-plugin-out_zerobus "${ZEROBUS_LIB_FILE}")
+
+# Platform-specific linker flags required by the Rust FFI static library
+if(WIN32)
+  target_link_libraries(flb-plugin-out_zerobus
+    ws2_32 ntdll userenv advapi32 bcrypt)
+elseif(APPLE)
+  target_link_libraries(flb-plugin-out_zerobus
+    "-framework CoreFoundation"
+    "-framework Security"
+    -liconv)
+elseif(UNIX)
+  target_link_libraries(flb-plugin-out_zerobus
+    -ldl -lpthread -lm -lresolv -lgcc_s)
+endif()