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."],[[["This document provides instructions on how to override the default authentication credentials used by client libraries when interacting with Google Cloud services."],["The default authentication method is Application Default Credentials, but users can override this by providing the UnifiedCredentialsOption."],["An example is provided demonstrating how to explicitly load a service account key file to override authentication, which is done through the UnifiedCredentialsOption, specifically with `MakeServiceAccountCredentials`."],["The document also has links to specific client examples for `metastore_v1::DataprocMetastoreClient` and `metastore_v1::DataprocMetastoreFederationClient`."],["The latest version of the Metastore is 2.37.0-rc, with many versions available, from 2.13.0 up to the most recent, all of which have the same authentication method and documentation."]]],[]]
