turn relayer into a server framework and put actual relay code into ./basic

basic/main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/fiatjaf/relayer"
+	"github.com/jmoiron/sqlx"
+	"github.com/jmoiron/sqlx/reflectx"
+	"github.com/kelseyhightower/envconfig"
+)
+
+type BasicRelay struct {
+	PostgresDatabase string `envconfig:"POSTGRESQL_DATABASE"`
+
+	DB *sqlx.DB
+}
+
+func (b *BasicRelay) Name() string {
+	return "BasicRelay"
+}
+
+func (b *BasicRelay) Init() error {
+	err := envconfig.Process("", b)
+	if err != nil {
+		return fmt.Errorf("couldn't process envconfig: %w", err)
+	}
+
+	if db, err := initDB(b.PostgresDatabase); err != nil {
+		return fmt.Errorf("failed to open database: %w", err)
+	} else {
+		db.Mapper = reflectx.NewMapperFunc("json", sqlx.NameMapper)
+		b.DB = db
+	}
+
+	go cleanupRoutine(b.DB)
+
+	return nil
+}
+
+func main() {
+	var b BasicRelay
+
+	relayer.Start(&b)
+}