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_TRANSFER_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "storagetransfer.googleapis.com") used by MakeStorageTransferServiceConnection().
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 2025-04-22 UTC."],[[["This document provides reference information for configuring the behavior of the Storage Transfer Service library using environment variables, which is particularly useful for troubleshooting."],["The latest version of the Storage Transfer Service, version 2.37.0-rc, is available, along with a comprehensive list of previous versions, down to version 2.11.0, each with its own specific documentation."],["Environment variables like `GOOGLE_CLOUD_CPP_STORAGE_TRANSFER_SERVICE_ENDPOINT` allow for overriding default endpoints, and `GOOGLE_CLOUD_CPP_ENABLE_TRACING` enables detailed tracing for gRPC calls."],["The `GOOGLE_CLOUD_CPP_ENABLE_CLOG` environment variable is necessary to enable output logging in the library, in addition to the program setting its own backend."],["`GOOGLE_CLOUD_PROJECT` is used to configure the GCP project for testing and examples, but it has no impact on the library itself."]]],[]]
