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 page documents the environment variables for configuring the behavior of the C++ Service Directory library, including overrides for service endpoints and logging options."],["The library supports setting custom endpoints for both the Lookup Service and Registration Service via environment variables `GOOGLE_CLOUD_CPP_LOOKUP_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_REGISTRATION_SERVICE_ENDPOINT`, respectively."],["Tracing for gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and detailed tracing options can be customized using `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["The `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` environment variable enables logging in the library, ensuring that log messages are outputted to the console if no other logging backend has been set."],["The page also provides a list of Service Directory versions, with the latest being `2.37.0-rc`."]]],[]]
