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::metastore_v1::DataprocMetastoreClient(
google::cloud::metastore_v1::MakeDataprocMetastoreConnection(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 2025-04-17 UTC."],[[["This page documents how to override the default authentication credentials for Google Cloud services, which typically use Application Default Credentials."],["You can override the default credentials by providing the `UnifiedCredentialsOption`, as demonstrated with an example showing how to load a service account key file."],["The document references version 2.16.0 and provides links to examples for `metastore_v1::DataprocMetastoreClient` and `metastore_v1::DataprocMetastoreFederationClient` classes within this version, and shows the version list down to 2.13.0 and up to 2.37.0-rc."],["The guide directs you to consult the 'Best practices for managing service account keys' and the 'Authentication Components' page for further information on credentials."]]],[]]
