From 601d803562cde9a7fe8d17120d073aea55ae1012 Mon Sep 17 00:00:00 2001
From: guo-shaoge <shaoge1994@163.com>
Date: Thu, 1 Jun 2023 12:58:11 +0800
Subject: [PATCH] support fetch server_info without starting Proxy (#330)

* support fetch server_info without starting Proxy

Signed-off-by: guo-shaoge <shaoge1994@163.com>
---
 proxy_components/proxy_ffi/src/interfaces.rs  |  9 +++++-
 proxy_components/proxy_server/src/util.rs     | 31 ++++++++++++++++++-
 .../ffi/src/RaftStoreProxyFFI/@version        |  2 +-
 .../ffi/src/RaftStoreProxyFFI/ProxyFFI.h      | 11 +++++++
 4 files changed, 50 insertions(+), 3 deletions(-)

diff --git a/proxy_components/proxy_ffi/src/interfaces.rs b/proxy_components/proxy_ffi/src/interfaces.rs
index 3f0e965e7c5..f457f3c79ac 100644
--- a/proxy_components/proxy_ffi/src/interfaces.rs
+++ b/proxy_components/proxy_ffi/src/interfaces.rs
@@ -613,7 +613,14 @@ pub mod root {
                 ) -> root::DB::FastAddPeerRes,
             >,
         }
-        pub const RAFT_STORE_PROXY_VERSION: u64 = 3617226644007633432;
+        extern "C" {
+            pub fn ffi_get_server_info_from_proxy(
+                arg1: isize,
+                arg2: root::DB::BaseBuffView,
+                arg3: root::DB::RawVoidPtr,
+            ) -> u32;
+        }
+        pub const RAFT_STORE_PROXY_VERSION: u64 = 17823293661468169526;
         pub const RAFT_STORE_PROXY_MAGIC_NUMBER: u32 = 324508639;
     }
 }
diff --git a/proxy_components/proxy_server/src/util.rs b/proxy_components/proxy_server/src/util.rs
index c00d196696a..1a5158ae335 100644
--- a/proxy_components/proxy_server/src/util.rs
+++ b/proxy_components/proxy_server/src/util.rs
@@ -1,6 +1,9 @@
 // Copyright 2022 TiKV Project Authors. Licensed under Apache-2.0.
 
-use std::time::{Duration, Instant};
+use std::{
+    pin::Pin,
+    time::{Duration, Instant},
+};
 
 use engine_store_ffi::ffi::interfaces_ffi::{BaseBuffView, RaftStoreProxyPtr, RawVoidPtr};
 use futures::{compat::Future01CompatExt, executor::block_on};
@@ -74,3 +77,29 @@ pub extern "C" fn ffi_server_info(
     engine_store_ffi::ffi::set_server_info_resp(&resp, res);
     0
 }
+
+#[no_mangle]
+pub extern "C" fn ffi_get_server_info_from_proxy(
+    server_helper_ptr: isize,
+    view: BaseBuffView,
+    res: RawVoidPtr,
+) -> u32 {
+    assert_ne!(server_helper_ptr, 0);
+    let mut req = ServerInfoRequest::default();
+    assert_ne!(view.data, std::ptr::null());
+    assert_ne!(view.len, 0);
+    req.merge_from_bytes(view.to_slice()).unwrap();
+
+    let resp = server_info_for_ffi(req);
+    let buff = engine_store_ffi::ffi::ProtoMsgBaseBuff::new(&resp);
+    unsafe {
+        let server_helper = &(*(server_helper_ptr
+            as *const engine_store_ffi::ffi::interfaces_ffi::EngineStoreServerHelper));
+        server_helper.set_pb_msg_by_bytes(
+            engine_store_ffi::ffi::interfaces_ffi::MsgPBType::ServerInfoResponse,
+            res,
+            Pin::new(&buff).into(),
+        );
+    }
+    0
+}
diff --git a/raftstore-proxy/ffi/src/RaftStoreProxyFFI/@version b/raftstore-proxy/ffi/src/RaftStoreProxyFFI/@version
index 98d5effe612..87cb8441a06 100644
--- a/raftstore-proxy/ffi/src/RaftStoreProxyFFI/@version
+++ b/raftstore-proxy/ffi/src/RaftStoreProxyFFI/@version
@@ -1,3 +1,3 @@
 #pragma once
 #include <cstdint>
-namespace DB { constexpr uint64_t RAFT_STORE_PROXY_VERSION = 3617226644007633432ull; }
\ No newline at end of file
+namespace DB { constexpr uint64_t RAFT_STORE_PROXY_VERSION = 17823293661468169526ull; }
\ No newline at end of file
diff --git a/raftstore-proxy/ffi/src/RaftStoreProxyFFI/ProxyFFI.h b/raftstore-proxy/ffi/src/RaftStoreProxyFFI/ProxyFFI.h
index 22558455e47..dd2b9498d51 100644
--- a/raftstore-proxy/ffi/src/RaftStoreProxyFFI/ProxyFFI.h
+++ b/raftstore-proxy/ffi/src/RaftStoreProxyFFI/ProxyFFI.h
@@ -304,4 +304,15 @@ struct EngineStoreServerHelper {
   FastAddPeerRes (*fn_fast_add_peer)(EngineStoreServerWrap *,
                                      uint64_t region_id, uint64_t new_peer_id);
 };
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+// Basically same as ffi_server_info, but no need to setup ProxyHelper, only
+// need to setup ServerHelper. Used when proxy not start.
+uint32_t ffi_get_server_info_from_proxy(intptr_t, BaseBuffView, RawVoidPtr);
+#ifdef __cplusplus
+}
+#endif
+
 }  // namespace DB