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::logging_v2::LoggingServiceV2Client(
google::cloud::logging_v2::MakeLoggingServiceV2Connection(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 2025-03-05 UTC."],[[["This document provides a version history, listing versions from 2.11.0 up to the latest release candidate 2.37.0-rc, of which each version is linked to its respective documentation on overriding authentication."],["The client libraries typically use Application Default Credentials for Google Cloud Services authentication, but this document details how to override the default using `UnifiedCredentialsOption`."],["An example is provided that demonstrates how to load a service account key file explicitly to override default authentication credentials."],["Users are directed to the \"Best practices for managing service account keys\" guide for more detailed information on managing service accounts."],["There is a link provided to \"Authentication Components\" for additional information on factory functions that can be used to create `google::cloud::Credentials` objects."]]],[]]
