syntax = "proto3";
package cdcpb;

import "raft_cmdpb.proto";
import "metapb.proto";
import "errorpb.proto";
import "kvrpcpb.proto";

import "gogoproto/gogo.proto";
import "rustproto.proto";

option(gogoproto.sizer_all) = true;
option(gogoproto.marshaler_all) = true;
option(gogoproto.unmarshaler_all) = true;
option(rustproto.lite_runtime_all) = true;

option java_package = "org.tikv.kvproto";

message Header {
    uint64 cluster_id = 1;
    string ticdc_version = 2;
}

message DuplicateRequest {
    uint64 region_id = 1;
}

message Compatibility {
    string required_version = 1;
}

// ClusterIDMismatch is an error variable that
// tells people that the cluster ID of the request does not match the TiKV cluster ID.
message ClusterIDMismatch {
    // The current tikv cluster ID.
    uint64 current = 1;
    // The cluster ID of the TiCDC request.
    uint64 request = 2;
}

message Error {
    errorpb.NotLeader not_leader = 1;
    errorpb.RegionNotFound region_not_found = 2;
    errorpb.EpochNotMatch epoch_not_match = 3;
    DuplicateRequest duplicate_request = 4;
    Compatibility compatibility = 5;
    ClusterIDMismatch cluster_id_mismatch = 6;
    errorpb.ServerIsBusy server_is_busy = 7;
}

message TxnInfo {
    uint64 start_ts = 1;
    bytes primary = 2;
}

message TxnStatus {
    uint64 start_ts = 1;
    uint64 min_commit_ts = 2;
    uint64 commit_ts = 3;
    bool is_rolled_back = 4;
}

message Event {
    enum LogType {
        UNKNOWN = 0;
        PREWRITE = 1;
        COMMIT = 2;
        ROLLBACK = 3;
        COMMITTED = 4;
        INITIALIZED = 5;
    }

    message Row {
        uint64 start_ts = 1;
        uint64 commit_ts = 2;
        LogType type = 3;

        enum OpType {
            UNKNOWN = 0;
            PUT = 1;
            DELETE = 2;
        }
        OpType op_type = 4;
        bytes key = 5;
        bytes value = 6;
        bytes old_value = 7;
        // expire_ts_unix_secs is used for RawKV (see `ChangeDataRequest.KvApi`),
        // and represents the expiration time of this row.
        // Absolute time, seconds since Unix epoch.
        uint64 expire_ts_unix_secs = 8;
        // The source of this row.
        uint64 txn_source = 9;
    }

    message Entries {
        repeated Row entries = 1;
    }

    message Admin {
        raft_cmdpb.AdminRequest admin_request = 1;
        raft_cmdpb.AdminResponse admin_response = 2;
    }

    message LongTxn {
        repeated TxnInfo txn_info = 1;
    }

    uint64 region_id = 1;
    uint64 index = 2;
    uint64 request_id = 7;
    oneof event {
        Entries entries = 3;
        Admin admin = 4;
        Error error = 5;
        uint64 resolved_ts = 6 [deprecated=true];
        // Note that field 7 is taken by request_id.
        LongTxn long_txn = 8;
        // More region level events ...
    }
}

// NOTE: events and resolved_ts won't appear simultaneously in one ChangeDataEvent.
message ChangeDataEvent {
    repeated Event events = 1;
    ResolvedTs resolved_ts = 2;
    // More store level events ...
}

message ResolvedTs {
    repeated uint64 regions = 1;
    uint64 ts = 2;
    uint64 request_id = 3;
}

message ChangeDataRequest {
    message Register {}

    message Deregister {}

    message NotifyTxnStatus {
        repeated TxnStatus txn_status = 1;
    }

    Header header = 1;
    uint64 region_id = 2;
    metapb.RegionEpoch region_epoch = 3;

    uint64 checkpoint_ts = 4;
    bytes start_key = 5;
    bytes end_key = 6;
    // Used for CDC to identify events corresponding to different requests.
    // Generally in one call stream, a region can be subscribed multiple
    // times with different `request_id`s.
    uint64 request_id = 7;

    kvrpcpb.ExtraOp extra_op = 8;

    oneof request {
        // A normal request that trying to register change data feed on a region.
        Register register = 9;

        // Notify the region that some of the running transactions on the region has a pushed
        // min_commit_ts so that the resolved_ts can be advanced.
        NotifyTxnStatus notify_txn_status = 10;

	Deregister deregister = 13;
    }

    // KvAPI specifies to capture data written by different KV API.
    // See more details in https://github.com/tikv/rfcs/blob/master/text/0069-api-v2.md.
    enum KvAPI {
       TiDB = 0;
       RawKV = 1;
       TxnKV = 2;
    }

    KvAPI kv_api = 11;

    // Whether to filter out the value write by cdc itself.
    bool filter_loop = 12;
}

service ChangeData {
    rpc EventFeed(stream ChangeDataRequest) returns(stream ChangeDataEvent);

    // EventFeedV2 is like EventFeed, with some new changes:
    //  * clients send requested features in HTTP/2 headers;
    //  * if servers meets unsupported feature request,
    //    it can fail the stream with an UNIMPLEMENTED error.
    rpc EventFeedV2(stream ChangeDataRequest) returns (stream  ChangeDataEvent);
}