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."],[[["The latest available version is 2.37.0-rc, with numerous other versions also documented and accessible, ranging down to 2.11.0."],["Client libraries typically use Application Default Credentials (ADC) for authentication with Google Cloud Services, but this default can be overridden."],["The UnifiedCredentialsOption allows for custom authentication, such as loading a service account key file, and the provided example demonstrates how to use it."],["There are specific examples provided for how to override authentication in `pubsublite::AdminServiceClient` and `pubsublite::TopicStatsServiceClient`."],["The documentation links to best practices for managing service account keys and also provides further information on Authentication Components and Credentials objects."]]],[]]
