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 lists available versions of the Service Directory C++ library, with the latest being version 2.37.0-rc, and provides links to the documentation for each version."],["Environment variables offer a method to configure the library's behavior, including endpoint overrides for the lookup and registration services."],["The library supports gRPC call tracing, which can be activated via `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, allowing users to monitor requests and responses."],["Logging in the library is controlled by environment variables, with `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` activating the output of log messages to the console."],["`GOOGLE_CLOUD_PROJECT=...` allows to set the default project for integration tests and examples, however, it has no effect within the library itself."]]],[]]
