add: env package to read and parse env for basic datatypes

env/env.go

@@ -0,0 +1,62 @@
+package env
+
+import (
+	"os"
+	"strconv"
+)
+
+// Bool looks up for boolean env variables and returns it.
+// This returns false if the key is not found or the value if non-boolean
+func Bool(key string, fallback bool) bool {
+	value, ok := os.LookupEnv(key)
+	if !ok {
+		return fallback
+	}
+
+	parseBool, err := strconv.ParseBool(value)
+	if err != nil {
+		return fallback
+	}
+
+	return parseBool
+}
+
+// String looks up for a string env variables and returns it.
+func String(key, fallback string) string {
+	value, ok := os.LookupEnv(key)
+	if !ok {
+		return fallback
+	}
+
+	return value
+}
+
+// Int looks up for a integer env variables and returns it.
+func Int(key string, fallback int) int {
+	value, ok := os.LookupEnv(key)
+	if !ok {
+		return fallback
+	}
+
+	parseInt, err := strconv.Atoi(value)
+	if err != nil {
+		return fallback
+	}
+
+	return parseInt
+}
+
+// Float looks up for a float64 env variables and returns it.
+func Float(key string, fallback float64) float64 {
+	value, ok := os.LookupEnv(key)
+	if !ok {
+		return fallback
+	}
+
+	parseFloat, err := strconv.ParseFloat(value, 64)
+	if err != nil {
+		return fallback
+	}
+
+	return parseFloat
+}