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_STORAGE_CONTROL_ENDPOINT=... overrides the EndpointOption (which defaults to "storage.googleapis.com") used by MakeStorageControlConnection().
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 2025-03-21 UTC."],[[["This document details environment variables and configurations for the Storage Control library, starting with version 2.22.0 and extending up to the latest release candidate 2.37.0-rc."],["Environment variables can be used to configure the library's behavior, especially useful for troubleshooting, and there are also corresponding in-code functions to achieve the same configuration results."],["`GOOGLE_CLOUD_CPP_STORAGE_CONTROL_ENDPOINT` is an override for the default endpoint used by `MakeStorageControlConnection()`."],["Tracing of gRPC calls is enabled with `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and alongside it, logging output can be directed to the program's console with `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The variable `GOOGLE_CLOUD_PROJECT` is utilized in examples and integration tests for GCP project configuration, although it does not have any effect on the library itself."]]],[]]
