syntax = "proto3";

package messaging_pb;

option java_package = "seaweedfs.client";
option java_outer_classname = "MessagingProto";

//////////////////////////////////////////////////

service SeaweedMessaging {

    rpc Subscribe (stream SubscriberMessage) returns (stream BrokerMessage) {
    }

    rpc Publish (stream PublishRequest) returns (stream PublishResponse) {
    }

    rpc ConfigureTopic (ConfigureTopicRequest) returns (ConfigureTopicResponse) {
    }

    rpc GetTopicConfiguration (GetTopicConfigurationRequest) returns (GetTopicConfigurationResponse) {
    }

}

//////////////////////////////////////////////////

message SubscriberMessage {
    message InitMessage {
        string namespace = 1;
        string topic = 2;
        int32 partition = 3;
        enum StartPosition {
            LATEST = 0; // Start at the newest message
            EARLIEST = 1; // Start at the oldest message
            TIMESTAMP = 2; // Start after a specified timestamp, exclusive
        }
        StartPosition startPosition = 4; // Where to begin consuming from
        int64 timestampNs = 5; // timestamp in nano seconds
        string subscriber_id = 6; // uniquely identify a subscriber to track consumption
    }
    InitMessage init = 1;
    message AckMessage {
        int64 message_id = 1;
    }
    AckMessage ack = 2;
}

message RawData {
    bytes key = 1; // Message key
    bytes value = 2; // Message payload
    map<string, bytes> headers = 3; // Message headers
}

message Message {
    int64 timestamp = 1 [jstype = JS_STRING]; // When the message was received by the broker
    bytes key = 2; // Message key
    bytes value = 3; // Message payload
    map<string, bytes> headers = 4; // Message headers
}

message BrokerMessage {
    Message data = 1;
    message RedirectMessage {
        string new_broker = 1;
    }
    RedirectMessage redirect = 2;
}

message PublishRequest {
    message InitMessage {
        string namespace = 1; // only needed on the initial request
        string topic = 2; // only needed on the initial request
        int32 partition = 3;
    }
    InitMessage init = 1;
    RawData data = 2;
}

message PublishResponse {
    message ConfigMessage {
        int32 partition_count = 1;
    }
    ConfigMessage config = 1;
    message RedirectMessage {
        string new_broker = 1;
    }
    RedirectMessage redirect = 2;
}

message ConfigureTopicRequest {
    string namespace = 1;
    string topic = 2;
    TopicConfiguration configuration = 3;
}
message ConfigureTopicResponse {
}

message GetTopicConfigurationRequest {
    string namespace = 1;
    string topic = 2;
}
message GetTopicConfigurationResponse {
    TopicConfiguration configuration = 1;
}

message TopicConfiguration {
    int32 partition_count = 1;
    string collection = 2;
    string replication = 3;
}