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 2025-03-05 UTC."],[[["This page provides documentation for overriding default authentication credentials in Google Cloud C++ client libraries for logging services, covering versions from 2.11.0 to 2.37.0-rc."],["The latest release candidate for logging service authentication override is version 2.37.0-rc."],["By default, Google Cloud C++ client libraries use Application Default Credentials (ADC), but this can be overridden by providing a `UnifiedCredentialsOption`, such as loading a service account key file."],["Examples of overriding credentials for specific logging client classes like `ConfigServiceV2Client`, `LoggingServiceV2Client`, and `MetricsServiceV2Client` are available."],["For best practices for service account key management, and more information on authentication components you can refer to the linked external resources."]]],[]]