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 guidance on overriding default authentication credentials for Google Cloud services, specifically within the context of C++ client libraries."],["The C++ client libraries typically use Application Default Credentials, but users can override this behavior by providing a `UnifiedCredentialsOption`."],["The document illustrates how to load a service account key file using the `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`, offering a practical example for implementing custom authentication."],["Multiple versions of documentation for the metastore are available, with version 2.37.0-rc being the latest release candidate, and version 2.22.0 being the current version context."],["The document links to examples of how to implement authentication override with different `*Client` classes for the metastore, such as `metastore_v1::DataprocMetastoreClient` and `metastore_v1::DataprocMetastoreFederationClient`."]]],[]]