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 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 content is on how to override the default authentication credentials using the `UnifiedCredentialsOption` for the client libraries."],["The example demonstrates loading a service account key file to override the default Application Default Credentials, and shows how you would set the options before making the `RapidMigrationAssessmentClient`."],["The content links to external resources, such as the \"Best practices for managing service account keys\" and \"Authentication Components,\" for additional guidance on credential management and factory functions."],["The default method of authentication is Application Default Credentials, however there are methods to change this if necessary."]]],[]]
