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."],["The latest release candidate version for C++ logging documentation is 2.37.0-rc, and multiple other versions are listed, ranging from 2.36.0 to 2.11.0."],["You can override the default credentials by providing a `UnifiedCredentialsOption`, for example, by explicitly loading a service account key file using `MakeServiceAccountCredentials`."],["Specific examples for overriding authentication are provided for `ConfigServiceV2Client`, `LoggingServiceV2Client`, and `MetricsServiceV2Client` classes within the `logging_v2` namespace."],["For detailed information on creating `google::cloud::Credentials` objects and managing service account keys, consult the \"Authentication Components\" and the \"Best practices for managing service account keys\" guides."]]],[]]
