FFI: add two empty implement FFI for compatibility

proxy_components/proxy_ffi/src/encryption_impls.rs

@@ -166,3 +166,22 @@ pub extern "C" fn ffi_handle_link_file(
         )
     }
 }
+
+// The CloudStorageEngineFFI contains dummy implementation of
+// CloudStorageEngine-specific FFI, not used, just for tiflash compilation.
+pub struct CloudStorageEngineFFI {}
+
+impl CloudStorageEngineFFI {
+    // always return false
+    pub extern "C" fn ffi_get_keyspace_encryption(
+        _proxy_ptr: RaftStoreProxyPtr,
+        _keyspace_id: u32,
+    ) -> bool {
+        return false;
+    }
+
+    // always return empty string
+    pub extern "C" fn ffi_get_master_key(_proxy_ptr: RaftStoreProxyPtr) -> RawCppStringPtr {
+        get_engine_store_server_helper().gen_cpp_string(b"")
+    }
+}

proxy_components/proxy_ffi/src/interfaces.rs

@@ -404,6 +404,14 @@ pub mod root {
                     arg3: root::DB::BaseBuffView,
                 ) -> root::DB::FileEncryptionInfoRaw,
             >,
+            pub fn_get_keyspace_encryption: ::std::option::Option<
+                unsafe extern "C" fn(arg1: root::DB::RaftStoreProxyPtr, arg2: u32) -> bool,
+            >,
+            pub fn_get_master_key: ::std::option::Option<
+                unsafe extern "C" fn(
+                    arg1: root::DB::RaftStoreProxyPtr,
+                ) -> root::DB::RawCppStringPtr,
+            >,
             pub fn_handle_batch_read_index: ::std::option::Option<
                 unsafe extern "C" fn(
                     arg1: root::DB::RaftStoreProxyPtr,

proxy_components/proxy_ffi/src/raftstore_proxy_helper_impls.rs

@@ -65,6 +65,8 @@ impl RaftStoreProxyFFIHelper {
             fn_handle_new_file: Some(ffi_handle_new_file),
             fn_handle_delete_file: Some(ffi_handle_delete_file),
             fn_handle_link_file: Some(ffi_handle_link_file),
+            fn_get_keyspace_encryption: Some(CloudStorageEngineFFI::ffi_get_keyspace_encryption),
+            fn_get_master_key: Some(CloudStorageEngineFFI::ffi_get_master_key),
             fn_handle_batch_read_index: Some(ffi_batch_read_index),
             sst_reader_interfaces: SSTReaderInterfaces {
                 fn_get_sst_reader: Some(ffi_make_sst_reader),

raftstore-proxy/ffi/src/RaftStoreProxyFFI/ProxyFFI.h

@@ -259,6 +259,8 @@ struct RaftStoreProxyFFIHelper {
                                                  BaseBuffView);
   FileEncryptionInfoRaw (*fn_handle_link_file)(RaftStoreProxyPtr, BaseBuffView,
                                                BaseBuffView);
+  bool (*fn_get_keyspace_encryption)(RaftStoreProxyPtr, uint32_t);
+  RawCppStringPtr (*fn_get_master_key)(RaftStoreProxyPtr);
   void (*fn_handle_batch_read_index)(
       RaftStoreProxyPtr, CppStrVecView, RawVoidPtr, uint64_t,
       void (*fn_insert_batch_read_index_resp)(RawVoidPtr, BaseBuffView,