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::run_v2::ExecutionsClient(
google::cloud::run_v2::MakeExecutionsConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["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 2025-03-21 UTC."],[[["This page details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services using C++ client libraries."],["The `UnifiedCredentialsOption` allows explicit loading of credentials, such as those from a service account key file, to override the default authentication method."],["The latest version documented here is `2.37.0-rc`, with multiple prior versions down to `2.11.0` also documented for reference, and the content has examples for various `*Client` classes like `ExecutionsClient`, `JobsClient`, `RevisionsClient`, `ServicesClient`, and `TasksClient`."],["The example provided focuses on loading credentials from a service account key file using the `MakeServiceAccountCredentials` function, with a reference to the best practices for managing service account keys."],["For further information on creating `google::cloud::Credentials` objects, users are directed to the \"Authentication Components\" documentation."]]],[]]
