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::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 2025-03-05 UTC."],[[["This document provides reference information for configuring the behavior of the library using environment variables, including version-specific details ranging from version 2.12.0 to the latest release candidate 2.37.0-rc."],["Environment variables like `GOOGLE_CLOUD_CPP_DOMAINS_ENDPOINT` can be utilized to override default endpoints, such as the \"domains.googleapis.com\" used by `MakeDomainsConnection()`."],["You can use `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` to activate tracing for most gRPC calls, while `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` offers further customization of the tracing behavior."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` will enable library logging to output to console, which it does not do by default."],["`GOOGLE_CLOUD_PROJECT` can be used to configure the GCP project for examples and integration tests, but does not have any effect in the library itself."]]],[]]
