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 2025-03-14 UTC."],[[["This document details environment variables and configuration options for the Storage Control library, with the latest release candidate being version 2.37.0-rc."],["Users can override the default endpoint for `MakeStorageControlConnection()` using the `GOOGLE_CLOUD_CPP_STORAGE_CONTROL_ENDPOINT` environment variable."],["Tracing for gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and the `GOOGLE_CLOUD_CPP_ENABLE_CLOG` variable can be set to produce the library logs to the program console."],["The library also supports various versions, from 2.21.0 up to the latest 2.37.0-rc, which are all detailed with links to their respective pages."],["`GOOGLE_CLOUD_PROJECT` can be used in examples and tests to set a GCP project, but this has no impact within the library."]]],[]]
