Add env defaulting funcs to operatorpkg

env/env.go

@@ -0,0 +1,73 @@
+package env
+
+import (
+	"os"
+	"strconv"
+	"time"
+)
+
+// WithDefaultInt returns the int value of the supplied environment variable or, if not present,
+// the supplied default value. If the int conversion fails, returns the default
+func WithDefaultInt(key string, def int) int {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return def
+	}
+	i, err := strconv.Atoi(val)
+	if err != nil {
+		return def
+	}
+	return i
+}
+
+// WithDefaultInt64 returns the int value of the supplied environment variable or, if not present,
+// the supplied default value. If the int conversion fails, returns the default
+func WithDefaultInt64(key string, def int64) int64 {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return def
+	}
+	i, err := strconv.ParseInt(val, 10, 64)
+	if err != nil {
+		return def
+	}
+	return i
+}
+
+// WithDefaultString returns the string value of the supplied environment variable or, if not present,
+// the supplied default value.
+func WithDefaultString(key string, def string) string {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return def
+	}
+	return val
+}
+
+// WithDefaultBool returns the boolean value of the supplied environment variable or, if not present,
+// the supplied default value.
+func WithDefaultBool(key string, def bool) bool {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return def
+	}
+	parsedVal, err := strconv.ParseBool(val)
+	if err != nil {
+		return def
+	}
+	return parsedVal
+}
+
+// WithDefaultDuration returns the duration value of the supplied environment variable or, if not present,
+// the supplied default value.
+func WithDefaultDuration(key string, def time.Duration) time.Duration {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return def
+	}
+	parsedVal, err := time.ParseDuration(val)
+	if err != nil {
+		return def
+	}
+	return parsedVal
+}