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::datastore_admin_v1::DatastoreAdminClient(
google::cloud::datastore_admin_v1::MakeDatastoreAdminConnection(
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 2025-03-05 UTC."],[[["The latest version available is 2.37.0-rc, with multiple preceding versions, such as 2.36.0, 2.35.0, and so on, listed down to version 2.15.1."],["Client libraries generally use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden if needed."],["Authentication can be overridden by providing the `UnifiedCredentialsOption`, and the provided example demonstrates how to load a service account key file."],["Examples for overriding authentication credentials are provided for `datastore_admin_v1::DatastoreAdminClient` and `datastore_v1::DatastoreClient`."],["The user should refer to the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" for more information."]]],[]]
