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::eventarc_publishing_v1::PublisherClient(
google::cloud::eventarc_publishing_v1::MakePublisherConnection(
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 2025-03-05 UTC."],[[["This document provides information on overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on the Eventarc service."],["The latest release candidate for the Eventarc C++ client library is version 2.37.0-rc, with numerous previous versions listed, ranging down to version 2.11.0."],["Authentication with Google Cloud services can be achieved by using Application Default Credentials, but overriding this is possible by employing the `UnifiedCredentialsOption`."],["Service account key files can be explicitly loaded to override the default credentials, as demonstrated by the provided code example showing how to load a key file."],["Examples for other `*Client` classes are available for `eventarc_publishing_v1::PublisherClient` and `eventarc_v1::EventarcClient`, showing how to use service accounts."]]],[]]