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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package metric // import "go.opentelemetry.io/otel/sdk/metric"
import (
"os"
"strconv"
"time"
"go.opentelemetry.io/otel/internal/global"
)
// Environment variable names.
const (
// The time interval (in milliseconds) between the start of two export attempts.
envInterval = "OTEL_METRIC_EXPORT_INTERVAL"
// Maximum allowed time (in milliseconds) to export data.
envTimeout = "OTEL_METRIC_EXPORT_TIMEOUT"
)
// envDuration returns an environment variable's value as duration in milliseconds if it is exists,
// or the defaultValue if the environment variable is not defined or the value is not valid.
func envDuration(key string, defaultValue time.Duration) time.Duration {
v := os.Getenv(key)
if v == "" {
return defaultValue
}
d, err := strconv.Atoi(v)
if err != nil {
global.Error(err, "parse duration", "environment variable", key, "value", v)
return defaultValue
}
if d <= 0 {
global.Error(errNonPositiveDuration, "non-positive duration", "environment variable", key, "value", v)
return defaultValue
}
return time.Duration(d) * time.Millisecond
}
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