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::managedkafka_v1::ManagedKafkaClient(
google::cloud::managedkafka_v1::MakeManagedKafkaConnection(options));
}
[[["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 release candidate version is 2.37.0-rc, and other versions available are from 2.36.0 down to 2.26.0."],["Client libraries utilize Application Default Credentials (ADC) for authentication with Google Cloud Services unless specifically configured otherwise."],["You can override default authentication by supplying the UnifiedCredentialsOption, for instance, loading a service account key file."],["Refer to the \"Best practices for managing service account keys\" guide for more detailed information on managing service account keys."],["The Authentication Components documentation provides more information on creating Credentials objects."]]],[]]
