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::cloudquotas_v1::CloudQuotasClient(
google::cloud::cloudquotas_v1::MakeCloudQuotasConnection(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 2025-04-17 UTC."],[[["The webpage provides documentation for various versions of the Cloud Quotas C++ client library, ranging from version 2.20.0 up to the latest release candidate 2.37.0-rc."],["The default authentication for the client libraries uses Application Default Credentials, but it can be overridden when necessary."],["You can override the default authentication by utilizing the `UnifiedCredentialsOption` and providing it with alternate credentials, such as a service account key file."],["The `MakeServiceAccountCredentials` function is used to create credentials from a service account key file, as demonstrated in the provided example code snippet."],["For more information on managing service account keys and authentication components, you can consult the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" documentation, respectively."]]],[]]
