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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::datamigration_v1::DataMigrationServiceClient( google::cloud::datamigration_v1::MakeDataMigrationServiceConnection( 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 2025-04-23 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, with a focus on Data Migration Service."],["The latest release candidate for the Data Migration Service documentation is version 2.37.0-rc, with multiple previous versions available ranging back to version 2.11.0."],["The default authentication method is Application Default Credentials, but the UnifiedCredentialsOption can be used to override this, for example, by loading a service account key file."],["The provided example demonstrates how to explicitly load a service account key file for authentication, with a recommendation to refer to the best practices guide for managing service account keys."],["More information on creating `google::cloud::Credentials` objects can be found in the Authentication Components section of the documentation."]]],[]]
