feat: add config module

go.mod

@@ -2,6 +2,9 @@ module git.ksdemosapps.com/kylesoda/go-migrate
 
 go 1.25.7
 
-require github.com/sirupsen/logrus v1.9.4
+require (
+	github.com/joho/godotenv v1.5.1
+	github.com/sirupsen/logrus v1.9.4
+)
 
 require golang.org/x/sys v0.13.0 // indirect

go.sum

@@ -1,5 +1,7 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sirupsen/logrus v1.9.4 h1:TsZE7l11zFCLZnZ+teH4Umoq5BhEIfIzfRDZ1Uzql2w=

internal/app/config/main.go

@@ -0,0 +1,49 @@
+package config
+
+import (
+	"os"
+
+	"github.com/joho/godotenv"
+	log "github.com/sirupsen/logrus"
+)
+
+type dbConfig struct {
+	Url string
+}
+
+type appConfig struct {
+	FromDb dbConfig
+	ToDb   dbConfig
+}
+
+func loadEnv() {
+	err := godotenv.Load()
+	if err != nil {
+		log.Warn("Warning: could not load .env file")
+	}
+}
+
+func getAppConfig() appConfig {
+	loadEnv()
+
+	fromDbUrl := os.Getenv("PG_FROM_DB_URL")
+	if fromDbUrl == "" {
+		log.Fatal("PG_FROM_DB_URL environment variable not set")
+	}
+
+	toDbUrl := os.Getenv("PG_TO_DB_URL")
+	if toDbUrl == "" {
+		log.Fatal("PG_TO_DB_URL environment variable not set")
+	}
+
+	return appConfig{
+		FromDb: dbConfig{
+			Url: fromDbUrl,
+		},
+		ToDb: dbConfig{
+			Url: toDbUrl,
+		},
+	}
+}
+
+var App appConfig = getAppConfig()