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 2025-04-17 UTC."],[[["The latest release candidate version is 2.37.0-rc, with the most recent stable release being 2.36.0, while the current documentation version is based on version 2.22.1."],["Client libraries typically use Application Default Credentials for authentication, but this can be overridden if necessary using the UnifiedCredentialsOption."],["Service account key files can be explicitly loaded to override default credentials, as demonstrated in the provided code snippet."],["Examples for overriding authentication are provided for `logging_v2::ConfigServiceV2Client`, `logging_v2::LoggingServiceV2Client`, and `logging_v2::MetricsServiceV2Client` classes."],["Refer to the \"Best practices for managing service account keys\" guide for detailed information and the Authentication Components section for more on creating `google::cloud::Credentials` objects."]]],[]]
