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::networkservices_v1::NetworkServicesClient(
google::cloud::networkservices_v1::MakeNetworkServicesConnection(
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 2025-03-14 UTC."],[[["This page documents different versions of the Network Services C++ client library, ranging from version 2.12.0 up to the release candidate 2.37.0-rc."],["The client libraries default to using Application Default Credentials for authentication with Google Cloud Services, but these can be overridden."],["Authentication can be overridden by providing the `UnifiedCredentialsOption`, which is demonstrated in the example showing how to load a service account key file."],["For guidance on managing service account keys, the \"Best practices for managing service account keys\" guide is referenced."],["The Authentication Components section provides more information about the factory functions to create `google::cloud::Credentials` objects."]]],[]]
