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::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 2025-03-14 UTC."],[[["The webpage provides a comprehensive list of available versions for the Service Directory, ranging from the latest release candidate 2.37.0-rc down to version 2.11.0."],["The behavior of the library can be configured using environment variables, such as those for endpoint overrides, logging, and tracing options."],["Endpoint overrides are available for both the `LookupServiceConnection` and `RegistrationServiceConnection` using specific environment variables."],["Tracing for gRPC calls can be enabled via the `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` environment variable, which logs each request and response, and enabling console output requires the additional setting of `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The environment variable `GOOGLE_CLOUD_PROJECT=...` can be used for examples and integration tests to configure the GCP project, but does not affect the library itself."]]],[]]
