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 2025-04-17 UTC."],[[["This page provides documentation for the Eventarc C++ client library, including version history and authentication override procedures."],["The latest release candidate version is 2.37.0-rc, and the documentation includes versions back to 2.11.0, for the `eventarc-override-authentication`."],["By default, the client libraries use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden."],["Overriding default authentication can be achieved by supplying the `UnifiedCredentialsOption`, such as loading a service account key file, with examples provided for `eventarc_publishing_v1::PublisherClient` and `eventarc_v1::EventarcClient`."],["Users should follow best practices for managing service account keys, as linked in the documentation, for more information and security."]]],[]]
