// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

syntax = "proto3";
option go_package = "pb";

package piecestore;

import "gogo.proto";
import "orders.proto";

service Piecestore {
    rpc Upload(stream PieceUploadRequest) returns (PieceUploadResponse) {}
    rpc Download(stream PieceDownloadRequest) returns (stream PieceDownloadResponse) {}
    rpc Delete(PieceDeleteRequest) returns (PieceDeleteResponse) {}
}

// Expected order of messages from uplink:
//   OrderLimit ->
//   repeated
//      Order ->
//      Chunk ->
//   PieceHash signed by uplink ->
//      <- PieceHash signed by storage node
//
message PieceUploadRequest {
    // first message to show that we are allowed to upload
    orders.OrderLimit2 limit = 1;
    // order for uploading
    orders.Order2      order = 2;

    // data message
    message Chunk {
        int64 offset = 1;
        bytes data = 2;
    }
    Chunk      chunk = 3;
    // final message
    orders.PieceHash done = 4;
}

message PieceUploadResponse {
    orders.PieceHash done = 1;
}

// Expected order of messages from uplink:
//   {OrderLimit, Chunk} ->
//   go repeated
//      Order -> (async)
//   go repeated
//      <- PieceDownloadResponse.Chunk
message PieceDownloadRequest {
    // first message to show that we are allowed to upload
    orders.OrderLimit2 limit = 1;
    // order for downloading
    orders.Order2      order = 2;

    // Chunk that we wish to download
    message Chunk {
        int64 offset = 1;
        int64 chunk_size = 2;
    }
    
    // request for the chunk
    Chunk chunk = 3;
}

message PieceDownloadResponse {
    // Chunk response for download request
    message Chunk {
        int64 offset = 1;
        bytes data = 2;
    }
    Chunk chunk = 1;
}

message PieceDeleteRequest {
    orders.OrderLimit2 limit = 1;
}

message PieceDeleteResponse {
}