syntax = "proto2";

// Sent as part of the noise protocol.
message NoisePayload {
  required bytes nonce = 1;
}

// type=0
message Open {
  required bytes discoveryKey = 1;
  optional bytes capability = 2;
}

// type=1, overall feed options. can be sent multiple times
message Options {
  repeated string extensions = 1; // Should be sorted lexicographically
  optional bool ack = 2; // Should all blocks be explicitly acknowledged?
}

// type=2, message indicating state changes etc.
// initial state for uploading/downloading is true
message Status {
  optional bool uploading = 1;
  optional bool downloading = 2;
}

// type=3, what do we have?
message Have {
  required uint64 start = 1;
  optional uint64 length = 2 [default = 1]; // defaults to 1
  optional bytes bitfield = 3;
  optional bool ack = 4; // when true, this Have message is an acknowledgement
}

// type=4, what did we lose?
message Unhave {
  required uint64 start = 1;
  optional uint64 length = 2 [default = 1]; // defaults to 1
}

// type=5, what do we want? remote should start sending have messages in this range
message Want {
  required uint64 start = 1;
  optional uint64 length = 2; // defaults to Infinity or feed.length (if not live)
}

// type=6, what don't we want anymore?
message Unwant {
  required uint64 start = 1;
  optional uint64 length = 2; // defaults to Infinity or feed.length (if not live)
}

// type=7, ask for data
message Request {
  required uint64 index = 1;
  optional uint64 bytes = 2;
  optional bool hash = 3;
  optional uint64 nodes = 4;
}

// type=8, cancel a request
message Cancel {
  required uint64 index = 1;
  optional uint64 bytes = 2;
  optional bool hash = 3;
}

// type=9, get some data
message Data {
  message Node {
    required uint64 index = 1;
    required bytes hash = 2;
    required uint64 size = 3;
  }

  required uint64 index = 1;
  optional bytes value = 2;
  repeated Node nodes = 3;
  optional bytes signature = 4;
}

// type=10, explicitly close a channel.
message Close {
  optional bytes discoveryKey = 1; // only send this if you did not do an open
}

// type=15, extension message