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 2025-03-05 UTC."],[[["This page provides documentation for various versions of the C++ Pub/Sub Lite client library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["The client libraries typically use Application Default Credentials for Google Cloud authentication, but you can override this with the UnifiedCredentialsOption."],["The provided example demonstrates how to override default authentication by loading a service account key file, and there are further example links provided for `pubsublite::AdminServiceClient` and `pubsublite::TopicStatsServiceClient` classes."],["Users are encouraged to review the \"Best practices for managing service account keys\" guide for more in-depth details on service account keys, as this is an easy to understand example."],["The page also directs users to the \"Authentication Components\" section for more information on creating `google::cloud::Credentials` objects."]]],[]]
