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::ConfigServiceV2Client(
google::cloud::logging_v2::MakeConfigServiceV2Connection(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."],[[["The latest version of the logging documentation is 2.37.0-rc, with previous versions available from 2.36.0 down to 2.11.0."],["By default, client libraries authenticate using Application Default Credentials, but you can override this with the UnifiedCredentialsOption."],["Overriding the default authentication can be done by loading a service account key file, as demonstrated in the provided example."],["Examples of how to override authentication credentials are provided for `logging_v2::ConfigServiceV2Client`, `logging_v2::LoggingServiceV2Client`, and `logging_v2::MetricsServiceV2Client`."],["For more in depth details, refer to the \"Best practices for managing service account keys\" guide, and the Authentication Components documentation."]]],[]]
