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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."],[[["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 describes how to override the default authentication credentials used by the client libraries with specific examples, to explicitly load a service account key file."],["The default authentication uses Application Default Credentials unless configured otherwise, for authenticating with Google Cloud Services."],["For managing service account keys, the document suggests consulting the best practices guide for more details, linked on the page."],["The page has a link to the \"Authentication Components\" section which provides more information on the factory functions to create `google::cloud::Credentials` objects."]]],[]]
