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 2025-05-07 UTC."],[[["This webpage provides documentation for various versions of the Google Cloud Pub/Sub Lite C++ client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The primary focus of the content is on how to override the default authentication credentials, which usually use Application Default Credentials, with specific credentials like a service account key file."],["The example code demonstrates loading a service account key file to override the default authentication using `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`."],["Links to example code snippets for `pubsublite::AdminServiceClient` and `pubsublite::TopicStatsServiceClient` are provided, showcasing how to override credentials in these client classes."],["The documentation directs users to best practices for managing service account keys and offers a link to further information on Authentication Components for creating `google::cloud::Credentials` objects."]]],[]]
