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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::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."],[[["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 client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden when needed."],["You can override the default authentication by providing a `UnifiedCredentialsOption`, such as loading a service account key file explicitly, demonstrated with an example code snippet."],["The provided example demonstrates how to load a service account key file, but it is suggested to consult the \"Best practices for managing service account keys\" guide for more detailed information."],["The \"Authentication Components\" link offers more details on creating `google::cloud::Credentials` objects for authentication purposes."]]],[]]
