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_IAM_CREDENTIALS_ENDPOINT=... overrides the EndpointOption (which defaults to "iamcredentials.googleapis.com") used by MakeIAMCredentialsConnection().
GOOGLE_CLOUD_CPP_IAM_ENDPOINT=... overrides the EndpointOption (which defaults to "iam.googleapis.com") used by MakeIAMConnection().
GOOGLE_CLOUD_CPP_IAM_POLICY_ENDPOINT=... overrides the EndpointOption (which defaults to "iam-meta-api.googleapis.com") used by MakeIAMPolicyConnection().
GOOGLE_CLOUD_CPP_POLICIES_ENDPOINT=... overrides the EndpointOption (which defaults to "iam.googleapis.com") used by MakePoliciesConnection().
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 2025-03-21 UTC."],[[["This document provides a comprehensive list of available versions for the C++ IAM library, starting from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["Environment variables can be utilized to configure the library's behavior, and there are also in-code functions that allow you to configure it, which is especially convenient for troubleshooting."],["Specific environment variables such as `GOOGLE_CLOUD_CPP_IAM_CREDENTIALS_ENDPOINT`, `GOOGLE_CLOUD_CPP_IAM_ENDPOINT`, `GOOGLE_CLOUD_CPP_IAM_POLICY_ENDPOINT`, and `GOOGLE_CLOUD_CPP_POLICIES_ENDPOINT` can be used to override the default endpoint options for various IAM connections."],["The environment variables `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` can be used for configuring gRPC call tracing and logging within the library."],["Setting the `GOOGLE_CLOUD_PROJECT` environment variable is useful for examples and integration tests to preconfigure the GCP project, but it has no effect within the library code itself."]]],[]]
