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_ENVIRONMENTS_ENDPOINT=... overrides the EndpointOption (which defaults to "composer.googleapis.com") used by MakeEnvironmentsConnection().
GOOGLE_CLOUD_CPP_IMAGE_VERSIONS_ENDPOINT=... overrides the EndpointOption (which defaults to "composer.googleapis.com") used by MakeImageVersionsConnection().
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 a comprehensive list of available versions, ranging from 2.11.0 to 2.37.0-rc, for a specific software component, with version 2.37.0-rc being the latest release candidate."],["The content details the use of environment variables for configuring library behavior and troubleshooting, which can be used in tandem with functions for code configuration."],["Endpoint overrides, such as `GOOGLE_CLOUD_CPP_ENVIRONMENTS_ENDPOINT` and `GOOGLE_CLOUD_CPP_IMAGE_VERSIONS_ENDPOINT`, allow users to customize the endpoints used by `MakeEnvironmentsConnection()` and `MakeImageVersionsConnection()`, respectively."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which will print each gRPC request and response, and combined with `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to show output on the console."],["The `GOOGLE_CLOUD_PROJECT` environment variable is specifically utilized in examples and integration tests to specify the GCP project, though it does not have any direct impact within the library itself."]]],[]]
