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_LOOKUP_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "servicedirectory.googleapis.com") used by MakeLookupServiceConnection().
GOOGLE_CLOUD_CPP_REGISTRATION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "servicedirectory.googleapis.com") used by MakeRegistrationServiceConnection().
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::LoggingComponentsOptionGOOGLE_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 2025-03-14 UTC."],[[["This document outlines the different versions of the C++ Service Directory library, with version 2.37.0-rc being the most recent release candidate and version 2.28.0 being the initial point."],["The library's behavior can be configured using various environment variables, which are particularly helpful for troubleshooting and adjusting settings."],["Endpoint overrides are possible via the environment variables `GOOGLE_CLOUD_CPP_LOOKUP_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_REGISTRATION_SERVICE_ENDPOINT` to modify the service endpoint used."],["Tracing and logging features can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, and `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` to monitor gRPC calls and library operations."],["Although `GOOGLE_CLOUD_PROJECT` is used for project configuration, it will not affect the library's behavior."]]],[]]
