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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::datafusion_v1::DataFusionClient( google::cloud::datafusion_v1::MakeDataFusionConnection(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 DataFusion, ranging from version 2.13.0 up to the release candidate 2.37.0-rc."],["The documentation focuses on how to override default authentication credentials when interacting with Google Cloud Services, offering examples of when and how to override the defaults."],["The primary method demonstrated for overriding default authentication involves using the `UnifiedCredentialsOption` to explicitly load a service account key file."],["The provided code example illustrates loading a service account key file using `UnifiedCredentialsOption` with `MakeServiceAccountCredentials` while also linking to best practice guides for managing service account keys."]]],[]]
