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 details how to override the default authentication credentials used by the client libraries when interacting with Google Cloud Services, specifically within the context of the provided C++ library versions."],["The latest version of the C++ library for Pub/Sub Lite is 2.37.0-rc, with a range of previous versions from 2.36.0 down to 2.11.0 also listed, alongside their corresponding documentation links."],["The `UnifiedCredentialsOption` can be used to override the default [Application Default Credentials](https://cloud.google.com/docs/authentication#adc), as demonstrated in the example code that loads a service account key file."],["Examples on overriding credentials can also be found for `pubsublite::AdminServiceClient` and `pubsublite::TopicStatsServiceClient` classes, with links to relevant documentation for version 2.33.0 provided."],["Refer to the documentation on [Authentication Components](https://cloud.google.com/cpp/docs/reference/common/latest/group__guac.html) and the [Best practices for managing service account keys](https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys) guide for more information."]]],[]]
