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::LoggingServiceV2Client(
google::cloud::logging_v2::MakeLoggingServiceV2Connection(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 2025-03-14 UTC."],[[["The latest version available is 2.37.0-rc, with previous versions listed down to 2.11.0 for reference."],["By default, client libraries use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden."],["You can override the default credentials by providing the `UnifiedCredentialsOption`, demonstrated using a service account key file example."],["The example shows how to explicitly load a service account key file to override the default authentication, which is a simple, easy to understand way of doing it, but is not the only way."],["For more details on managing service account keys, consult the Best practices guide and for more information on creating credentials objects, check the Authentication Components section."]]],[]]
