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_ADMIN_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "pubsublite.googleapis.com") used by MakeAdminServiceConnection().
GOOGLE_CLOUD_CPP_TOPIC_STATS_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "pubsublite.googleapis.com") used by MakeTopicStatsServiceConnection().
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."],[[["The latest version available for the Pub/Sub Lite C++ library is 2.37.0-rc, with numerous previous versions, ranging from 2.36.0 down to 2.11.0, also accessible."],["Environment variables can be used to configure the library's behavior and are especially useful for troubleshooting, in addition to functions within the code."],["Specific environment variables like `GOOGLE_CLOUD_CPP_ADMIN_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_TOPIC_STATS_SERVICE_ENDPOINT` can override default endpoints for services, with the default endpoint being pubsublite.googleapis.com."],["Tracing and logging can be enabled for gRPC calls by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and logging output can be directed to the console with `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, both with options for further configuration."],["`GOOGLE_CLOUD_PROJECT` is an environment variable that configures the GCP project in examples and tests, but is not used in the library itself."]]],[]]
