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, specifically focusing on the `UnifiedCredentialsOption`."],["The latest release is version 2.37.0-rc, with versions dating back to 2.11.0 also available, offering links to specific documentation for each release, all of which are in the context of overriding credentials."],["The document provides an example of how to explicitly load a service account key file to override the default Application Default Credentials, as well as relevant links for client classes such as `LineageClient` and `DataCatalogClient`."],["It is advised to consult the \"Best practices for managing service account keys\" guide for more in depth details about managing these keys."],["Users can find more information on the factory functions for creating `google::cloud::Credentials` objects within the Authentication Components section."]]],[]]
