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::profiler_v2::ExportServiceClient(
google::cloud::profiler_v2::MakeExportServiceConnection(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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on the Profiler service.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release candidate for the Profiler service is version 2.37.0-rc, while the current stable version is 2.35.0, with a full list of previous releases all the way back to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eOverriding the default authentication involves using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e and loading a service account key file, as demonstrated in the provided code snippet.\u003c/p\u003e\n"],["\u003cp\u003eExamples of overriding authentication are available for \u003ccode\u003eprofiler_v2::ExportServiceClient\u003c/code\u003e and \u003ccode\u003eprofiler_v2::ProfilerServiceClient\u003c/code\u003e, each having a link to a specific page.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation links to additional resources on authentication components and best practices for managing service account keys.\u003c/p\u003e\n"]]],[],null,[]]
