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::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 2025-04-22 UTC."],[[["This document provides environment variable configurations and version history for the Storage Transfer Service C++ client library, specifically starting with version 2.13.0 and including the latest release candidate 2.37.0-rc."],["The `GOOGLE_CLOUD_CPP_STORAGE_TRANSFER_SERVICE_ENDPOINT` environment variable allows overriding the default endpoint used by `MakeStorageTransferServiceConnection()`."],["Tracing for gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which will print gRPC requests and responses, especially when combined with `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` configures the behavior of gRPC tracing, allowing control over the formatting of the output."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` will enable logging within the library."]]],[]]
