initial commit

config/env_loader.go

@@ -0,0 +1,56 @@
+// env_loader.go
+
+// Package config handles application configuration through environment variables
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+// LoadEnv loads environment variables from .env file if present
+func LoadEnv() error {
+	// Check if .env file exists
+	if _, err := os.Stat(".env"); os.IsNotExist(err) {
+		// No .env file, that's fine - we'll use environment variables directly
+		return nil
+	}
+
+	// Load from .env file
+	err := godotenv.Load()
+	if err != nil {
+		return fmt.Errorf("error loading .env file: %w", err)
+	}
+
+	return nil
+}
+
+// MustLoadEnv loads environment variables and exits on error
+func MustLoadEnv() {
+	if err := LoadEnv(); err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to load environment: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+// SetEnvWithDefault sets an environment variable if it's not already set
+func SetEnvWithDefault(key, defaultValue string) {
+	if _, exists := os.LookupEnv(key); !exists {
+		os.Setenv(key, defaultValue)
+	}
+}
+
+// SetEnvDefaults sets default values for environment variables
+// that are not already set
+func SetEnvDefaults() {
+	defaults := map[string]string{
+		"MIGRATION_STATE_FILE": "migration_state.json",
+		"RESUME_MIGRATION":     "true",
+	}
+
+	for key, value := range defaults {
+		SetEnvWithDefault(key, value)
+	}
+}