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 2025-05-02 UTC."],[[["This page lists various versions of the `trace-override-authentication` documentation, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The documentation explains how to override the default Application Default Credentials (ADC) used by client libraries for Google Cloud Service authentication, which is necessary in specific scenarios."],["Overriding default credentials can be achieved by providing the `UnifiedCredentialsOption`, with an example provided demonstrating how to load a service account key file."],["Examples are provided for both `trace_v1::TraceServiceClient` and `trace_v2::TraceServiceClient` classes, showcasing how to handle service accounts."],["It's essential to review the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" for more in-depth information on service account key management and creating credentials objects."]]],[]]
