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Add implementation plan for automatic shard/CDC replica sync #79

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ceae46b
Initial plan
Copilot Nov 29, 2025
694a6d9
Add sync protocol messages and constants for replica database synchro…
Copilot Nov 29, 2025
7e01e71
Add ShardSyncServer - TCP server for shard sync protocol
Copilot Nov 29, 2025
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507 changes: 507 additions & 0 deletions cpp/core/MsgsGen.cpp
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237 changes: 237 additions & 0 deletions cpp/core/MsgsGen.hpp
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10 changes: 10 additions & 0 deletions cpp/core/Protocol.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,14 @@ constexpr uint32_t LOG_REQ_PROTOCOL_VERSION = 0x474f4c;
// '1474f4c'
constexpr uint32_t LOG_RESP_PROTOCOL_VERSION = 0x1474f4c;

// >>> format(struct.unpack('<I', b'SYN\0')[0], 'x')
// '4e5953'
constexpr uint32_t SYNC_REQ_PROTOCOL_VERSION = 0x4e5953;

// >>> format(struct.unpack('<I', b'SYN\1')[0], 'x')
// '14e5953'
constexpr uint32_t SYNC_RESP_PROTOCOL_VERSION = 0x14e5953;

struct ShardCheckPointedResp {
public:
static constexpr size_t STATIC_SIZE = LogIdx::STATIC_SIZE + ShardRespContainer::STATIC_SIZE;
Expand Down Expand Up @@ -103,3 +111,5 @@ using LogReqMsg = SignedProtocolMessage<LOG_REQ_PROTOCOL_VERSION, LogReqContaine
using LogRespMsg = SignedProtocolMessage<LOG_RESP_PROTOCOL_VERSION, LogRespContainer>;
using ProxyShardReqMsg = SignedProtocolMessage<PROXY_SHARD_REQ_PROTOCOL_VERSION, ShardReqContainer>;
using ProxyShardRespMsg = SignedProtocolMessage<PROXY_SHARD_RESP_PROTOCOL_VERSION, ShardCheckPointedResp>;
using SyncReqMsg = ProtocolMessage<SYNC_REQ_PROTOCOL_VERSION, SyncReqContainer>;
using SyncRespMsg = ProtocolMessage<SYNC_RESP_PROTOCOL_VERSION, SyncRespContainer>;
2 changes: 1 addition & 1 deletion cpp/shard/CMakeLists.txt
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Expand Up @@ -4,7 +4,7 @@

include_directories(${ternfs_SOURCE_DIR}/core ${ternfs_SOURCE_DIR}/crc32c)

add_library(shard Shard.cpp Shard.hpp ShardDB.cpp ShardDB.hpp ShardDBData.cpp ShardDBData.hpp BlockServicesCacheDB.hpp BlockServicesCacheDB.cpp)
add_library(shard Shard.cpp Shard.hpp ShardDB.cpp ShardDB.hpp ShardDBData.cpp ShardDBData.hpp BlockServicesCacheDB.hpp BlockServicesCacheDB.cpp ShardSyncServer.cpp ShardSyncServer.hpp)
target_link_libraries(shard PRIVATE core)

add_executable(ternshard ternshard.cpp)
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