Added environment variables

config/helpers.go

@@ -0,0 +1,73 @@
+package config
+
+import (
+	"log"
+	"os"
+	"strconv"
+)
+
+// getEnv returns value for give key from environment
+// if key is not present in environment it returns defaultValue
+func getEnv(key, defaultValue string) string {
+	v := os.Getenv(key)
+	if len(v) > 0 {
+		return v
+	}
+	return defaultValue
+}
+
+// getEnvInt returns integer value for give key from environment
+// if key is not present in environment it returns defaultValue
+// if key cannot be parsed to integer function will panic
+func getEnvInt(key string, defaultValue int) int {
+	v := os.Getenv(key)
+	if len(v) == 0 {
+		return defaultValue
+	}
+
+	valInteger, err := strconv.Atoi(v)
+	if err != nil {
+		log.Fatalf("variable `%s` cannot be parsed to INTEGER", key)
+	}
+
+	return valInteger
+}
+
+// getEnvInt returns integer value for give key from environment
+// if key is not present in environment it returns defaultValue
+// if key cannot be parsed to integer function will panic
+func getEnvBoolWithDefault(key string, defaultValue bool) bool {
+	v := os.Getenv(key)
+	if len(v) == 0 {
+		return defaultValue
+	}
+
+	val, err := strconv.ParseBool(v)
+	if err != nil {
+		log.Fatalf("variable `%s` cannot be parsed to BOOL", key)
+	}
+
+	return val
+}
+
+// getEnv extracts the bool value from environment variable
+func getEnvBool(env string) bool {
+	envVal := mustGetEnv(env)
+	value, err := strconv.ParseBool(envVal)
+
+	if err != nil {
+		value = false
+	}
+
+	return value
+}
+
+// mustGetEnv returns value for give key from environment
+// if key is not present in environment function will panic
+func mustGetEnv(key string) string {
+	v := os.Getenv(key)
+	if len(v) == 0 {
+		log.Fatalf(" variable `%s` is not present in ENVIRONMENT", key)
+	}
+	return v
+}