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::logging_v2::ConfigServiceV2Client(
google::cloud::logging_v2::MakeConfigServiceV2Connection(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 page provides documentation for overriding default authentication credentials in Google Cloud C++ client libraries for logging, covering versions from 2.11.0 up to 2.37.0-rc."],["The latest version available is 2.37.0-rc, but the content primarily focuses on version 2.20.0 and how to manage service account authentication for that version."],["The default authentication is managed using Application Default Credentials, but can be overridden by loading a service account key file using the `UnifiedCredentialsOption`, in order to provide specified credentials."],["Examples are provided for `logging_v2::ConfigServiceV2Client`, `logging_v2::LoggingServiceV2Client`, and `logging_v2::MetricsServiceV2Client` classes on how to override authentication."],["The \"Best practices for managing service account keys\" guide is referenced for further information on managing service account keys securely."]]],[]]