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_QUOTA_CONTROLLER_ENDPOINT=... overrides the EndpointOption (which defaults to "servicecontrol.googleapis.com") used by MakeQuotaControllerConnection().
GOOGLE_CLOUD_CPP_SERVICE_CONTROLLER_ENDPOINT=... overrides the EndpointOption (which defaults to "servicecontrol.googleapis.com") used by MakeServiceControllerConnection().
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 2025-03-21 UTC."],[[["The webpage provides documentation for various versions of a service control library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["Environment variables offer a way to configure the library's behavior, useful for troubleshooting, and can be overridden by in-code functions."],["Specific environment variables can override the default endpoint for quota and service controller connections, such as `GOOGLE_CLOUD_CPP_QUOTA_CONTROLLER_ENDPOINT` and `GOOGLE_CLOUD_CPP_SERVICE_CONTROLLER_ENDPOINT`."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, while logging output requires `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to also be set, if not configured with a custom logging backend."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` allows customization of gRPC tracing behavior, and `GOOGLE_CLOUD_PROJECT` can be used to set the GCP project for examples and integration tests, but not inside the library."]]],[]]
