Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::batch_v1::BatchServiceClient(
google::cloud::batch_v1::MakeBatchServiceConnection(options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-05 UTC."],[[["This document provides a version history, detailing releases from version 2.11.0 up to the latest release candidate, 2.37.0-rc, all related to batch override authentication."],["The client libraries use Application Default Credentials for authentication with Google Cloud Services unless overridden."],["You can override default credentials by using the `UnifiedCredentialsOption`, for instance, loading a service account key file explicitly."],["The provided example code shows a basic method to load a service account key file and create a `BatchServiceClient` with specific authentication options."],["For more on managing service account keys, refer to the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" documentation for details on creating `google::cloud::Credentials` objects."]]],[]]
