components/variations/proto/stored_seed_info.proto

// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";

option optimize_for = LITE_RUNTIME;

package variations;

// Wraps a stored VariationsSeed and other seed-related info.
//
// Next tag: 9
message StoredSeedInfo {
  // Raw seed data.
  // As a memory optimization, the seed data may be cleared from memory after
  // being written to disk, unless it's empty or it's the sentinel value.
  // Check `has_data()` to see if the seed data is present in memory.
  optional string data = 1;

  // Base 64 encoded signature of the seed received from the server. It's used
  // to verify the seed. See VariationsSeedStore::VerifyAndParseSeed().
  optional string signature = 2;

  // The milestone with which the seed was fetched.
  optional uint32 milestone = 3;

  // Seed date used for study checks. Is a server-provided timestamp.
  // On some platforms, on the first run, it's set to a client-provided
  // timestamp until the server-provided timestamp is fetched.
  optional int64 seed_date = 4;

  // Client-side timestamp when the seed was fetched for last time.
  optional int64 client_fetch_time = 5;

  // Country code of the client fetched from the server. Used for evaluating
  // session consistency studies.
  optional string session_country_code = 6;

  // Country code used for evaluating permanent consistency studies. This is
  // the country code received from the server after upgrading to the version
  // `permanent_version`. It's stored once per version upgrade.
  optional string permanent_country_code = 7;

  // Chrome version used for evaluating studies. The version stored at the same
  // time as `permanent_country_code`.
  optional string permanent_version = 8;
}