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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::trace_v1::TraceServiceClient( google::cloud::trace_v1::MakeTraceServiceConnection(options)); }
Follow these links to find examples for other *Client classes:
[[["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 2025-03-14 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on the `trace` service."],["The latest version available is 2.37.0-rc, with several other versions listed from 2.36.0 down to 2.11.0, and each of them provides the same trace-override-authentication."],["Client libraries typically use Application Default Credentials for authentication, but users can override this by providing a `UnifiedCredentialsOption`."],["An example demonstrates how to load a service account key file to override the default credentials for the `TraceServiceClient`."],["Further examples for other client classes such as `trace_v1::TraceServiceClient` and `trace_v2::TraceServiceClient` are available, along with a guide on best practices for managing service account keys."]]],[]]
