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_GATEWAY_CONTROL_ENDPOINT=... overrides the EndpointOption (which defaults to "connectgateway.googleapis.com") used by MakeGatewayControlConnection().
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 2025-03-21 UTC."],[[["This page details the environment variables available for configuring the behavior of the Google Cloud C++ library, which are especially useful for troubleshooting."],["The `GOOGLE_CLOUD_CPP_GATEWAY_CONTROL_ENDPOINT` variable overrides the default endpoint used by `MakeGatewayControlConnection()`, allowing for custom endpoint configurations."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` enables tracing for gRPC calls, providing detailed information on requests and responses."],["`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` enables the library's logging mechanism, allowing messages to be printed to the console when no other logging backend is configured."],["The variable `GOOGLE_CLOUD_PROJECT` can be used to set the GCP project for examples and testing, however, it has no effect in the library itself."]]],[]]
