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Showing content from https://cloud.google.com/cpp/docs/reference/datastream/2.19.0/datastream-override-authentication below:

C++ Client Libraries | Google Cloud

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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::datastream_v1::DatastreamClient(
        google::cloud::datastream_v1::MakeDatastreamConnection(options));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["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 2025-08-14 UTC."],[[["The latest version available is 2.37.0-rc, with numerous other versions, including the current version 2.19.0, also accessible via the provided links."],["Client libraries default to using Application Default Credentials for Google Cloud Services authentication, but this can be overridden."],["You can override default credentials by utilizing the `UnifiedCredentialsOption`, such as by loading a service account key file."],["The provided code sample illustrates loading a service account key file using `UnifiedCredentialsOption` to customize authentication."],["For further information on authentication procedures, refer to the section on Authentication Components, which details the factory functions for creating `google::cloud::Credentials` objects, as well as the Best Practices for managing service account keys."]]],[]]

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