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_DOMAINS_ENDPOINT=... overrides the EndpointOption (which defaults to "domains.googleapis.com") used by MakeDomainsConnection().
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 2025-03-05 UTC."],[[["This document provides reference information for the C++ Domains library, starting with version 2.27.0 and including various versions up to the latest release candidate, 2.37.0-rc."],["Environment variables can be used to configure the library's behavior, such as overriding the default endpoint with `GOOGLE_CLOUD_CPP_DOMAINS_ENDPOINT`."],["Tracing for gRPC calls can be enabled via `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and the behavior of gRPC tracing can be customized with `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["Logging can be enabled in the library by setting the environment variable `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`, allowing for the outputting of log information."],["Setting the default project can be done with the enviornment variable `GOOGLE_CLOUD_PROJECT`, but only affects tests and examples."]]],[]]
