Function createTmpConfigInFileSystem

gcp/observability/observability_test.go:236–251

createTmpConfigInFileSystem creates a random observability config at a random place in the temporary portion of the file system dependent on system. It also sets the environment variable GRPC_CONFIG_OBSERVABILITY_JSON to point to this created config.

(rawJSON string)

// also sets the environment variable GRPC_CONFIG_OBSERVABILITY_JSON to point to
// this created config.
func createTmpConfigInFileSystem(rawJSON string) (func(), error) {
	configJSONFile, err := os.CreateTemp(os.TempDir(), "configJSON-")
	if err != nil {
		return nil, fmt.Errorf("cannot create file %v: %v", configJSONFile.Name(), err)
	}
	_, err = configJSONFile.Write(json.RawMessage(rawJSON))
	if err != nil {
		return nil, fmt.Errorf("cannot write marshalled JSON: %v", err)
	}
	oldObservabilityConfigFile := envconfig.ObservabilityConfigFile
	envconfig.ObservabilityConfigFile = configJSONFile.Name()
	return func() {
		configJSONFile.Close()
		envconfig.ObservabilityConfigFile = oldObservabilityConfigFile
	}, nil
}

// TestJSONEnvVarSet tests a valid observability configuration specified by the
// GRPC_CONFIG_OBSERVABILITY_JSON environment variable, whose value represents a