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 webpage lists the available versions of the Pub/Sub Lite C++ client library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["The content explains how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud services, which can be done via the `UnifiedCredentialsOption`."],["The guide shows an example of loading a service account key file to set up custom authentication credentials when using the client libraries."],["Examples for other client classes, `pubsublite::AdminServiceClient` and `pubsublite::TopicStatsServiceClient`, are also provided for reference."],["The content also links to further resources, like best practices for managing service account keys and more information on the factory functions to create credentials objects."]]],[]]
