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 release candidate version for the datastore documentation is 2.37.0-rc, and the page contains a list of documentation versions ranging from 2.15.1 up to 2.37.0-rc."],["By default, the client libraries utilize Application Default Credentials for Google Cloud Service authentication, but users can override this by employing the `UnifiedCredentialsOption`."],["The provided code snippet demonstrates how to load a service account key file to override default credentials using `google::cloud::MakeServiceAccountCredentials`."],["Examples of overriding authentication are available for both `datastore_admin_v1::DatastoreAdminClient` and `datastore_v1::DatastoreClient`."],["For additional information on managing service account keys and authentication components, refer to the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" section, respectively."]]],[]]
