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 page provides documentation for different versions of the Batch service, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The default authentication method for client libraries is Application Default Credentials, but it can be overridden for specific use cases."],["Authentication credentials can be overridden by utilizing the `UnifiedCredentialsOption` to explicitly load a service account key file."],["The example shows how to load a service account key file using `MakeServiceAccountCredentials` within the `UnifiedCredentialsOption`."],["For more information on authentication, refer to the \"Authentication Components\" link and the \"Best practices for managing service account keys\" guide."]]],[]]
