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

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

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

package gracefulexit;

// NodeGracefulExit is a private service on storagenodes
service NodeGracefulExit {
  // GetSatellitesList returns a list of satellites that the storagenode has not begun a graceful exit for.
  rpc GetNonExitingSatellites(GetNonExitingSatellitesRequest) returns (GetNonExitingSatellitesResponse);
  // StartExit updates one or more satellites in the storagenode's database to be gracefully exiting.
  rpc StartExit(StartExitRequest) returns (StartExitResponse);
 
}

message GetNonExitingSatellitesRequest{}

message StartExitRequest {
  repeated bytes node_ids = 1 [(gogoproto.customtype) = "NodeID", (gogoproto.nullable) = false];
}

// NonExitingSatellite contains information that's needed for a storagenode to start graceful exit
message NonExitingSatellite {
    bytes node_id = 1 [(gogoproto.customtype) = "NodeID", (gogoproto.nullable) = false];
    string domain_name = 2;
    double space_used = 3;
}

message GetNonExitingSatellitesResponse {
  repeated NonExitingSatellite satellites = 1;
}

// StartExitStatus indicates the result of graceful exit initialization from a storagenode
message StartExitStatus {
  string domain_name = 1;
  bool success = 2;
}

message StartExitResponse {
  repeated StartExitStatus statuses = 1;
}

service SatelliteGracefulExit {
 // Process is called by storage nodes to initiate the graceful exit, get pieces to transfer, and receive exit status.
  rpc Process(stream StorageNodeMessage) returns (stream SatelliteMessage);
}

message TransferSucceeded {
  metainfo.AddressedOrderLimit addressed_order_limit   = 1;
  orders.PieceHash             original_piece_hash     = 2;
  orders.PieceHash             replacement_piece_hash  = 3;
}

message TransferFailed {
  bytes piece_id = 1 [(gogoproto.customtype) = "PieceID", (gogoproto.nullable) = false];
  enum Error {
      NOT_FOUND                 = 0;
      STORAGE_NODE_UNAVAILABLE  = 1;
      UNKNOWN                   = 2;
  }
  Error error = 2;
}

message StorageNodeMessage {
  oneof Message {
    TransferSucceeded succeeded = 1;
    TransferFailed    failed    = 2;
  }
}

message NotReady {}

message TransferPiece {
  bytes piece_id    = 1 [(gogoproto.customtype) = "PieceID", (gogoproto.nullable) = false]; // the current piece-id
  bytes private_key = 2 [(gogoproto.customtype) = "PiecePrivateKey", (gogoproto.nullable) = false];
  // addressed_order_limit contains the new piece id.
  metainfo.AddressedOrderLimit addressed_order_limit =3;              
}

message DeletePiece {
  bytes piece_id = 1 [(gogoproto.customtype) = "PieceID", (gogoproto.nullable) = false];
}

message ExitCompleted {
  // when everything is completed
  bytes exit_complete_signature = 1;
}


message ExitFailed {
  enum Reason {
      VERIFICATION_FAILED = 0;
  }
  // on failure
  bytes exit_failure_signature  = 1;
  Reason reason                 = 2;
}

message SatelliteMessage {
  oneof Message {
    NotReady      not_ready       = 1;
    TransferPiece transfer_piece  = 2;
    DeletePiece   delete_piece    = 3;
    ExitCompleted exit_completed  = 4;
    ExitFailed    exit_failed     = 5;
  }
}