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::datacatalog_lineage_v1::LineageClient(
google::cloud::datacatalog_lineage_v1::MakeLineageConnection(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 when using Google Cloud client libraries, with version 2.17.0 being the current documented version."],["The latest release candidate version is 2.37.0-rc, and the page lists numerous prior versions down to 2.11.0."],["Client libraries typically use Application Default Credentials for authentication, but users can override this by utilizing the `UnifiedCredentialsOption`."],["The documentation demonstrates how to load a service account key file to override default credentials, setting credentials through the `UnifiedCredentialsOption` in the example provided."],["The page also provides links to examples for various client classes like `datacatalog_lineage_v1::LineageClient`, `datacatalog_v1::DataCatalogClient`, `datacatalog_v1::PolicyTagManagerClient` and `datacatalog_v1::PolicyTagManagerSerializationClient`."]]],[]]
