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_LANGUAGE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "language.googleapis.com") used by MakeLanguageServiceConnection().
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 document outlines various versions of the C++ library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc, with the current version being 2.26.0."],["Environment variables such as `GOOGLE_CLOUD_CPP_LANGUAGE_SERVICE_ENDPOINT`, `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` can be utilized to configure the library's behavior, including endpoint overrides, tracing, and logging."],["The environment variable `GOOGLE_CLOUD_PROJECT` is used in examples and integration tests to set the GCP project, but it does not directly affect the behavior of the library itself."],["Tracing can be enabled for most gRPC calls by using the environment variable `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, which injects a stub decorator that prints gRPC requests and responses."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` is another environment variable that will modify the gRPC tracing behavior, for example if messages are output on multiple lines or whether or not string/bytes fields will be truncated."]]],[]]
