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 document provides version-specific reference links for overriding authentication in the `metastore` component, ranging from the latest release candidate `2.37.0-rc` down to version `2.13.0`."],["The default authentication method uses Application Default Credentials, but it can be overridden using the `UnifiedCredentialsOption`."],["A service account key file can be loaded to override the default credentials, as demonstrated in the provided code example that shows the process."],["Examples are provided for the `metastore_v1::DataprocMetastoreClient` and `metastore_v1::DataprocMetastoreFederationClient` classes on how to use service account keys for overriding credentials."],["For more details on credential creation and best practices for service account keys, the document refers to the \"Authentication Components\" section and the \"Best practices for managing service account keys\" guide."]]],[]]
