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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::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 2025-04-01 UTC."],[[["This document provides a version history of the logging override authentication documentation, with the latest release candidate being version 2.37.0-rc."],["The document explains how to override the default Application Default Credentials (ADC) for authentication with Google Cloud Services by using the `UnifiedCredentialsOption`."],["An example demonstrates loading a service account key file to override the default credentials using the provided code snippet, showcasing the process with `google::cloud::UnifiedCredentialsOption` and `MakeServiceAccountCredentials`."],["Examples for overriding authentication are provided for other `*Client` classes, including `logging_v2::ConfigServiceV2Client`, `logging_v2::LoggingServiceV2Client`, and `logging_v2::MetricsServiceV2Client`."],["The documentation recommends consulting the \"Best practices for managing service account keys\" guide for more detailed information and refers to the \"Authentication Components\" page for information on creating `google::cloud::Credentials` objects."]]],[]]
