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::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 provides reference information for configuring the behavior of the storage control library, with version 2.29.0 being the latest fully released version and version 2.37.0-rc as the most recent release candidate."],["Environment variables such as `GOOGLE_CLOUD_CPP_STORAGE_CONTROL_ENDPOINT`, `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` can be utilized to customize the library's operation, including endpoint overrides and logging capabilities."],["The library supports gRPC tracing, which can be activated via `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, and further customized using the `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` environment variable to modify how tracing data is displayed."],["The `GOOGLE_CLOUD_PROJECT` variable is used for testing purposes in examples and integration tests but has no impact on the library's functionality."],["Logging can be enabled within the library by setting the `GOOGLE_CLOUD_CPP_ENABLE_CLOG` environment variable to \"yes\", which allows log output to be printed to the program's console, especially in the absence of a custom logging backend."]]],[]]
