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."],[[["The page 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."],["It explains how to override the default authentication credentials used by the client libraries with specific details on providing a `UnifiedCredentialsOption` for situations where default credentials are not sufficient."],["An example is provided on how to explicitly load a service account key file, demonstrating how to set up the `UnifiedCredentialsOption` to override the authentication."],["The document references the best practices guide for managing service account keys, recommending that users refer to it for more detailed information."],["There is a \"See Also\" section pointing users to the Authentication Components page for additional details on creating `google::cloud::Credentials` objects."]]],[]]
