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 2025-03-14 UTC."],[[["The latest release candidate version is 2.37.0-rc, and the content provides a comprehensive list of versions ranging from this version down to version 2.13.0."],["By default, client libraries authenticate using Application Default Credentials, but users can override this setting by supplying a UnifiedCredentialsOption."],["The example provided demonstrates how to override the default authentication using a service account key file, loaded explicitly to set `UnifiedCredentialsOption`."],["`DataprocMetastoreClient` and `DataprocMetastoreFederationClient` are included as examples of the implementation within the document, with provided links to associated code snippets."],["The guide provides links to the \"Authentication Components\" page for information on creating `google::cloud::Credentials` objects, as well as the \"Best practices for managing service account keys\" page for more information."]]],[]]
