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syntax = "proto3";

package nix.proto;

// Service representing a worker used for building and interfacing
// with the Nix store.
service Worker {
  // Validates whether the supplied path is a valid store path.
  rpc IsValidPath (IsValidPathRequest) returns (IsValidPathResponse);

  // Checks whether any substitutes exist for the given path.
  rpc HasSubstitutes (HasSubstitutesRequest) returns (HasSubstitutesResponse);

  // Query referrers for a given path.
  rpc QueryReferrers (QueryReferrersRequest) returns (QueryReferrersResponse);

  // Add a NAR (I think?) to the store. The first stream request
  // should be a message indicating metadata, the rest should be file
  // chunks.
  rpc AddToStore (stream AddToStoreRequest) returns (AddToStoreResponse);

  // Adds the supplied string to the store, as a text file.
  rpc AddTextToStore (AddTextToStoreRequest) returns (AddTextToStoreResponse);
}

enum HashType {
  MD5 = 0; // TODO(tazjin): still needed?
  SHA1 = 1;
  SHA256 = 2;
  SHA512 = 3;
}

message IsValidPathRequest {
  string path = 1;
}

message IsValidPathResponse {
  bool is_valid = 1;
}

message HasSubstitutesRequest {
  string path = 1;
}

message HasSubstitutesResponse {
  bool has_substitutes = 1;
}

message QueryReferrersRequest {
  string path = 1;
}

message QueryReferrersResponse {
  repeated string paths = 1;
}

message AddToStoreRequest {
  message Metadata {
    bool fixed = 1;
    bool recursive = 2; // TODO(tazjin): what is this? "obsolete" comment?
    HashType hash_type = 3;
    string base_name = 4;
  }

  message Chunk {
    bytes content = 1;
    bool final = 2;
  }

  oneof add_oneof {
    Metadata meta = 1;
    Chunk chunk = 2;
  }
}

message AddToStoreResponse {
  string path = 1;
}

message AddTextToStoreRequest {
  string name = 1;
  string content = 2;
  repeated string references = 3;
}

message AddTextToStoreResponse {
  string path = 1;
}