A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_HUB_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "networkconnectivity.googleapis.com") used by MakeHubServiceConnection().
GOOGLE_CLOUD_CPP_POLICY_BASED_ROUTING_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "networkconnectivity.googleapis.com") used by MakePolicyBasedRoutingServiceConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
See Also
google::cloud::TracingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["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 outlines environment variables and configuration options for the network connectivity C++ library, including options for tracing and logging."],["The latest release candidate version for the network connectivity library is 2.37.0-rc, with numerous prior versions listed, starting from version 2.36.0 down to 2.11.0."],["`GOOGLE_CLOUD_CPP_HUB_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_POLICY_BASED_ROUTING_SERVICE_ENDPOINT` can be used to override default endpoints for specific services."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` enables detailed tracing of gRPC calls and logs to the program's console respectively."],["The `GOOGLE_CLOUD_PROJECT` environment variable can be used in examples and integration tests, but does not directly affect the library's functionality."]]],[]]
