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."],[[["This page lists the available versions of the C++ client library for Google Cloud Datastore, ranging from version 2.15.1 up to the release candidate 2.37.0-rc, and the currently selected version is 2.24.0."],["The client libraries typically use Application Default Credentials (ADC) for authentication, but this can be overridden if necessary."],["To override the default credentials, you can provide the UnifiedCredentialsOption, with an example showing how to load a service account key file."],["Examples for other `*Client` classes, specifically `datastore_admin_v1::DatastoreAdminClient` and `datastore_v1::DatastoreClient`, are provided for overriding credentials."],["For further information, you can refer to the best practices guide for managing service account keys and the Authentication Components section."]]],[]]
