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::ExperimentalTag{},
google::cloud::datacatalog_lineage_v1::MakeLineageConnection(
google::cloud::ExperimentalTag{}, 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 2025-03-21 UTC."],[[["This page provides documentation for overriding default authentication credentials in the Google Cloud C++ client libraries for Data Catalog, specifically for versions ranging from 2.11.0 to 2.37.0-rc, with version 2.37.0-rc being the latest."],["The client libraries typically utilize Application Default Credentials for authentication, but users can override this by providing the `UnifiedCredentialsOption`."],["The documentation details how to explicitly load a service account key file to override default credentials, including a code snippet demonstrating this process."],["Examples for overriding authentication are provided for `datacatalog_lineage_v1::LineageClient`, `datacatalog_v1::DataCatalogClient`, `datacatalog_v1::PolicyTagManagerClient`, and `datacatalog_v1::PolicyTagManagerSerializationClient`."],["Users are advised to refer to the \"Best practices for managing service account keys\" guide for more detailed information on service account key management and the \"Authentication Components\" page for more information on how to create credentials."]]],[]]
