@0xb8f6c1e2a3d4e5f6;

struct MessageHeader {
  key @0 :Text;
  value @1 :Data;
}

struct PublishMessage {
  topic @0 :Text;
  key @1 :Data;
  value @2 :Data;
  headers @3 :List(MessageHeader);
}

struct PublishRequest {
  messages @0 :List(PublishMessage);
  ackMode @1 :UInt8;
  producerId @2 :Text;
}

struct PublishResult {
  topic @0 :Text;
  partition @1 :UInt32;
  offset @2 :UInt64;
}

struct PublishResponse {
  results @0 :List(PublishResult);
}

struct SubscribeRequest {
  topic @0 :Text;
  partition @1 :UInt32;
  consumerGroup @2 :Text;
  startOffset @3 :UInt64;
  hasStartOffset @4 :Bool;
  maxBatchSize @5 :UInt32;
}

struct ConsumedMessage {
  offset @0 :UInt64;
  topic @1 :Text;
  partition @2 :UInt32;
  key @3 :Data;
  value @4 :Data;
  headers @5 :List(MessageHeader);
  timestampMs @6 :UInt64;
}

struct SubscribeResponse {
  messages @0 :List(ConsumedMessage);
}

struct AckRequest {
  consumerGroup @0 :Text;
  topic @1 :Text;
  partition @2 :UInt32;
  offset @3 :UInt64;
}

struct AckResponse {}

struct ErrorResponse {
  message @0 :Text;
}