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::rapidmigrationassessment_v1::
RapidMigrationAssessmentClient(
google::cloud::rapidmigrationassessment_v1::
MakeRapidMigrationAssessmentConnection(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 2025-03-05 UTC."],[[["This page provides documentation for various versions of the Rapid Migration Assessment tool, ranging from version 2.13.0 up to the latest release candidate, 2.37.0-rc."],["The primary focus of the documentation is on how to override default authentication credentials when interacting with Google Cloud Services using the provided C++ client libraries."],["The default authentication method utilizes Application Default Credentials, but users can override this by employing the `UnifiedCredentialsOption` and providing an explicit service account key file."],["The provided example code demonstrates the process of loading a service account key file and creating a `RapidMigrationAssessmentClient` with customized authentication options."],["For more in-depth information, the page suggests reviewing the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" section of the documentation."]]],[]]
