// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package zipkin // import "go.opentelemetry.io/otel/exporters/zipkin"

import "os"

// Environment variable names.
const (
	// Endpoint for Zipkin collector.
	envEndpoint = "OTEL_EXPORTER_ZIPKIN_ENDPOINT"
)

// envOr returns an env variable's value if it is exists or the default if not.
func envOr(key, defaultValue string) string {
	if v, ok := os.LookupEnv(key); ok && v != "" {
		return v
	}
	return defaultValue
}