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 2025-03-21 UTC."],[[["The webpage provides a list of available versions for Rapid Migration Assessment, ranging from version 2.13.0 up to the latest release candidate 2.37.0-rc."],["The default authentication method for client libraries is Application Default Credentials, but users can override this behavior."],["Users can override default credentials by using the `UnifiedCredentialsOption` and explicitly loading a service account key file."],["The example code demonstrates how to load credentials from a service account key file using `MakeServiceAccountCredentials`, for use in authenticating and creating a RapidMigrationAssessmentClient."],["For more details on creating `google::cloud::Credentials` objects and general best practices for service account key management, you can reference the provided links."]]],[]]
