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::pubsublite::AdminServiceClient(
google::cloud::pubsublite::MakeAdminServiceConnection(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 page details how to override the default authentication credentials for Google Cloud Pub/Sub Lite client libraries, using `UnifiedCredentialsOption`."],["The latest release candidate version for the Pub/Sub Lite client libraries is `2.37.0-rc`, with several prior versions listed for reference."],["Client libraries use Application Default Credentials by default, but you can use `UnifiedCredentialsOption` to provide an alternative authentication method, like a service account key file."],["Examples of overriding authentication are provided for `pubsublite::AdminServiceClient` and `pubsublite::TopicStatsServiceClient` classes."],["The page references the best practices for managing service account keys, and provides links to further documentation for Authentication Components."]]],[]]
